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Advances in Groundwater Flow and Solute Transport: Pushing the Hidden Boundary

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ISBN: 9783039210749 9783039210756 Year: Pages: 196 DOI: 10.3390/books978-3-03921-075-6 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- Environmental Technology
Added to DOAB on : 2019-12-09 11:49:15
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In recent decades, the study of groundwater flow and solute transport has advanced into new territories that are beyond conventional theories, such as Darcy’s law and Fick’s law. The studied media have changed from permeable porous and fractured ones to much less permeable ones, such as clay and shale. The studied pore sizes have also changed from millimetres to micro-meters or even nano-meters. The objective of this Special Issue is to report recent advances in groundwater flow and solute transport that push the knowledge boundary into new territories which include, but are not limited to, flow and transport in sloping aquifer/hillslopes, coupled unsaturated and saturated flow, coupled aquifer-vertical/horizontal/slant well flow, interaction of aquifer with connected and disconnected rivers, non-Darcian flow, anomalous transport beyond the Fickian scheme, and flow and transport in extremely small pore spaces such as shale and tight sandstones. Contributions focusing on innovative experimental, numerical, and analytical methods for understanding unconventional problems, such as the above-listed ones, are encouraged, and contributions addressing flow and transport at interfaces of different media and crossing multiple temporal and spatial scales are of great value

Advancements in Gel Science—A Special Issue in Memory of Toyoichi Tanaka

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ISBN: 9783039213436 9783039213443 Year: Pages: 178 DOI: 10.3390/books978-3-03921-344-3 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- Chemical Technology
Added to DOAB on : 2019-12-09 11:49:15
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A gel is a state of matter that consists of a three-dimensional cross-linked polymer network and a large amount of solvent. Because of their structural characteristics, gels play important roles in science and technology. The science of gels has attracted much attention since the discovery of the volume phase transition by Professor Toyoichi Tanala at MIT in 1978. MDPI planned to publish a Special Issue in Gels to celebrate the 40th anniversary of this discovery, which received submissions of 13 original papers and one review from various areas of science. We believe that readers will find this Special Issue informative as to the recent advancements of gel research and the broad background of gel science.

Keywords

gel --- thermoresponsive property --- monomer sequence --- co-crosslinking --- copolymerization --- acrylamide derivative --- swelling --- volume phase transition --- agarose gel --- compression --- solvent transport --- sucrose --- xylitol --- volume phase transition --- effects of electric charge --- swelling of thermosensitive gels --- sol-gel transition --- site-bond correlated-percolation model for polymer gelation --- gelation temperature --- cloud point temperature --- spinodal temperature --- spinodal decomposition --- janus particle --- anisotropic shape --- phase separation --- wetting --- micrometric confinement --- micropipette aspiration --- PVA gel --- gamma ray sterilization --- artificial hydrogel cartilage --- frictional property --- wear --- xerogel --- Brunauer-Emmett-Teller theory --- Barrett-Joyner-Halenda analysis --- temperature --- solids content --- drying --- solvent exchange --- microgel --- electrophoresis --- light scattering --- paint coating --- wrinkle --- swelling --- buckling --- Sephadex® (crosslinked dextran) --- crosslink density (density of crosslinks) --- ice grain --- ice crystallization during rewarming --- glassy water --- X-ray CT --- XRD --- poly(vinyl alcohol) --- chemical gel --- microcrystallite --- hydrogen bond --- swelling behavior --- hysteresis --- hydrogel --- friction --- fatigue --- wear --- fracture --- crack --- adhesion --- delamination --- poly (acryl amide) gel --- time domain reflectometry (TDR) of dielectric spectroscopy --- pulse field gradient spin echo method of nuclear magnetic resonance (PFG-NMR) --- scaling analysis --- fractal analysis --- heterogeneous gelation dynamics --- moving boundary picture --- phase transition dynamics --- kinetic coefficient --- blood coagulation --- n/a

Quantum Information and Foundations

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ISBN: 9783039283804 9783039283811 Year: Pages: 508 DOI: 10.3390/books978-3-03928-381-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Mathematics
Added to DOAB on : 2020-04-07 23:07:09
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Quantum information has dramatically changed information science and technology, looking at the quantum nature of the information carrier as a resource for building new information protocols, designing radically new communication and computation algorithms, and ultra-sensitive measurements in metrology, with a wealth of applications. From a fundamental perspective, this new discipline has led us to regard quantum theory itself as a special theory of information, and has opened routes for exploring solutions to the tension with general relativity, based, for example, on the holographic principle, on non-causal variations of the theory, or else on the powerful algorithm of the quantum cellular automaton, which has revealed new routes for exploring quantum fields theory, both as a new microscopic mechanism on the fundamental side, and as a tool for efficient physical quantum simulations for practical purposes. In this golden age of foundations, an astonishing number of new ideas, frameworks, and results, spawned by the quantum information theory experience, have revolutionized the way we think about the subject, with a new research community emerging worldwide, including scientists from computer science and mathematics.

Keywords

reconstruction of quantum theory --- entanglement --- monogamy --- quantum non-locality --- conserved informational charges --- limited information --- complementarity --- characterization of unitary group and state spaces --- algebraic quantum theory --- C*-algebra --- gelfand duality --- classical context --- bohrification --- process theory --- classical limit --- purity --- higher-order interference --- generalised probabilistic theories --- Euclidean Jordan algebras --- Pauli exclusion principle --- quantum foundations --- X-ray spectroscopy --- underground experiment --- silicon drift detector --- measurement uncertainty relations --- relative entropy --- position --- momentum --- quantum mechanics --- the measurement problem --- collapse models --- X-rays --- quantum gravity --- discrete spacetime --- causal sets --- path summation --- entropic gravity --- physical computing models --- complexity classes --- causality --- blind source separation (BSS) --- qubit pair --- exchange coupling --- entangled pure state --- unentanglement criterion --- probabilities in quantum measurements --- independence of random quantum sources --- iterant --- Clifford algebra --- matrix algebra --- braid group --- Fermion --- Dirac equation --- quantum information --- quantum computation --- semiclassical physics --- quantum control --- quantum genetic algorithm --- sampling-based learning control (SLC) --- quantum foundations --- relativity --- quantum gravity --- cluster states --- multipartite entanglement --- percolation --- Shannon information --- quantum information --- quantum measurements --- consistent histories --- incompatible frameworks --- single framework rule --- probability theory --- entropy --- quantum relative entropy --- quantum information --- quantum mechanics --- inference --- quantum measurement --- quantum estimation --- macroscopic quantum measurement --- quantum annealing --- adiabatic quantum computing --- hard problems --- Hadamard matrix --- binary optimization --- reconstruction of quantum mechanics --- conjugate systems --- Jordan algebras --- quantum correlations --- Gaussian states --- Gaussian unitary operations --- continuous-variable systems --- Wigner-friend experiment --- no-go theorem --- quantum foundations --- interpretations of quantum mechanics --- subsystem --- agent --- conservation of information --- purification --- group representations --- commuting subalgebras --- quantum walks --- Hubbard model --- Thirring model --- quantum information --- quantum foundations --- quantum theory and gravity

Mathematical Modeling of Fluid Flow and Heat Transfer in Petroleum Industries and Geothermal Applications

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ISBN: 9783039287208 / 9783039287215 Year: Pages: 470 DOI: 10.3390/books978-3-03928-721-5 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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Geothermal energy is the thermal energy generated and stored in the Earth's core, mantle, and crust. Geothermal technologies are used to generate electricity and to heat and cool buildings. To develop accurate models for heat and mass transfer applications involving fluid flow in geothermal applications or reservoir engineering and petroleum industries, a basic knowledge of the rheological and transport properties of the materials involved (drilling fluid, rock properties, etc.)—especially in high-temperature and high-pressure environments—are needed. This Special Issue considers all aspects of fluid flow and heat transfer in geothermal applications, including the ground heat exchanger, conduction and convection in porous media. The emphasis here is on mathematical and computational aspects of fluid flow in conventional and unconventional reservoirs, geothermal engineering, fluid flow, and heat transfer in drilling engineering and enhanced oil recovery (hydraulic fracturing, CO2 injection, etc.) applications.

Keywords

dynamic hydraulic-fracturing experiments --- dynamic crack tip --- fluid front kinetics --- energy conservation analysis --- cost-effective --- frequency conversion technology (FCT) --- ventilation --- methane removal --- computational fluid dynamic (CFD) --- spatiotemporal characteristics --- capacitance-resistance model --- aquifer support --- inter-well connectivity --- production optimization --- karst carbonate reservoir --- tight reservoir --- huff-‘n-puff --- fracture simulation --- enhanced oil recovery --- CO2 diffusion --- percolation model --- fractal theory --- microstructure --- critical porosity --- conductivity --- permeability --- tight oil reservoirs --- fracture compressibility --- numerical simulation --- flowback --- fracture uncertainty --- enhanced geothermal systems --- multiple parallel fractures --- semi-analytical solution --- main gas pipeline --- pressure fluctuations --- unsteady process --- multifractal theory --- fractal theory --- pore structure --- mercury intrusion porosimetry --- pore size distribution --- natural gas --- pipeline network --- continuity/momentum and energy equations coupled --- efficient simulation --- enhanced gas recovery --- longitudinal dispersion coefficient --- injection orientation --- supercritical CO2 --- CO2 permeability --- Coal excavation --- coal and rock fracture --- multiple structural units (MSU) --- energy dissipation --- AE energy --- cement --- non-Newtonian fluids --- rheology --- variable viscosity --- diffusion --- underground coal gasification (UCG) --- economics --- cost of electricity (COE) --- techno-economic model --- methanol --- ammonia --- carbon capture and storage (CCS) --- carbon capture and utilization (CCU) --- electricity generation --- process simulation --- fractal --- slippage effect --- Knudsen diffusion --- surface diffusion --- apparent permeability --- wellbore temperature --- bottom-hole pressure --- multi-pressure system --- comprehensive heat transfer model --- leakage and overflow --- GSHP (ground source heat pump) --- heat transfer --- coupled heat conduction and advection --- nest of tubes --- three-dimensional numerical simulation --- sloshing --- real-scale --- highly viscous fluids --- Navier-Stokes equations --- impact pressure --- flowback --- complex fracture network --- shale oil --- porous media --- fractal theory --- particles model --- permeability --- tube bundle model --- cement slurries --- non-Newtonian fluids --- rheology --- constitutive relations --- viscosity --- yield stress --- thixotropy --- mathematical modeling --- computational fluid dynamics (CFD) --- drilling --- porous media --- multiphase flow --- hydraulic fracturing --- geothermal --- enhanced oil recovery

Fluid Flow in Fractured Porous Media

Authors: ---
ISBN: 9783039214235 9783039214242 Year: Volume: 1 Pages: 578 DOI: 10.3390/books978-3-03921-424-2 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-12-09 11:49:15
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Abstract

The fluid flow in fracture porous media plays a significant role in the assessment of deep underground reservoirs, such as through CO2 sequestration, enhanced oil recovery, and geothermal energy development. Many methods have been employed—from laboratory experimentation to theoretical analysis and numerical simulations—and allowed for many useful conclusions. This Special Issue aims to report on the current advances related to this topic. This collection of 58 papers represents a wide variety of topics, including on granite permeability investigation, grouting, coal mining, roadway, and concrete, to name but a few. We sincerely hope that the papers published in this Special Issue will be an invaluable resource for our readers.

Keywords

scanning electron microscope (SEM) images --- permeability --- high temperature --- Darcy’s law --- confining pressures --- chemical grouts --- grain size of sand --- initial water contained in sand --- grouted sand --- macroscopic mechanical behaviors --- microstructure characteristics --- ductile failure --- gas concentration --- gob-side entry retaining (GER) --- limestone roof --- roof-cutting resistance --- roadside backfill body (RBB) --- solid backfill coal mining --- goaf --- water soaked height --- loose gangue backfill material --- deformation --- crushing ratio --- fracture grouting --- cement–silicate grout --- geophysical prospecting --- seepage --- Yellow River Embankment --- contiguous seams --- water-dripping roadway --- roadway deformation --- bolt support --- pervious concrete --- permeability coefficient --- porosity --- pore distribution characteristics --- strength --- soil–structure interface --- internal erosion --- critical hydraulic gradient --- orthogonal tests --- Pseudo Steady-State (PPS) constant --- finite-conductivity fracture --- conductivity-influence function --- normalized conductivity-influence function --- circular closed reservoir --- glutenite --- gravel --- hydraulic fracture --- numerical simulation --- propagation --- glauberite cavern for storing oil &amp --- gas --- thermal-hydrological-chemical interactions --- temperature --- brine concentration --- microstructure --- micro-CT --- damage --- cyclic heating and cooling --- physical and mechanical parameters --- failure mode --- acoustic emission --- anisotropy --- bedding plane orientation --- coal --- gas --- adsorption–desorption --- laboratory experiment --- pore pressure --- hydro-mechanical coupling --- fracture closure --- constitutive model --- effective stress --- debris flow --- dynamic characteristics --- numerical analysis --- debris-resisting barriers --- coal measures sandstone --- creep characteristics --- seepage pressure --- seepage-creep --- microscopic morphology --- Darcy flow --- heterogeneity --- numerical manifold method --- high-order --- refraction law --- hydraulic fracture network --- cohesive element method --- coal seams --- fracture propagation --- discontinuous natural fracture --- secondary fracture --- fault water inrush --- coupled THM model --- nonlinear flow in fractured porous media --- numerical model --- warning levels of fault water inrush --- bentonite-sand mixtures --- differential settlement --- deformation --- hydraulic conductivity --- crack --- geogrid --- enhanced permeability --- deviatoric stress --- mechanical behavior transition --- CH4 seepage --- volumetric strain --- strain-based percolation model --- rock-soil mechanics --- soft filling medium --- segmented grouting --- split grouting --- model experiment --- reinforcement mechanism --- longwall mining --- gob behaviors --- stress relief --- permeability --- gas drainage --- hard and thick magmatic rocks --- orthogonal ratio test --- similar simulation --- fracture --- bed separation --- disaster-causing mechanism --- artificial joint rock --- shear-flow coupled test --- hydraulic aperture --- roughness --- seepage pressure --- mixing --- conservative solute --- fractal --- roughness --- fracture --- transversely isotropic rocks --- failure mechanism --- particle flow modeling --- interface --- n/a --- fractured porous rock mass --- grouting experiment --- visualization system --- flow law --- layered progressive grouting --- sandstone and mudstone particles --- rheological deformation --- segmented rheological model --- rheological limit strain --- rheological test --- water-rock interaction --- dry-wet cycles --- slope stability --- laboratory experiment --- mechanical properties --- Xinjiang --- land reclamation --- management period --- soil particle size --- fluid flow in reclaimed soil --- effluents --- soil properties --- cohesive soils --- contamination --- time variation --- stabilization --- mixer --- viscoelastic fluid --- pore structure --- orthogonal test --- fluid–solid coupling theory --- similar-material --- regression equation --- optimum proportioning --- hydraulic fracturing --- gas fracturing --- oriented perforation --- fracture propagation --- damage mechanics --- fluid viscosity --- CO2 flooding --- supercritical CO2 --- CO2 geological storage --- tight sandstone gas reservoirs --- enhanced gas recovery --- flotation --- coal particle --- collision angle --- initial settlement position --- particle velocity --- adhesion efficiency --- green mining --- paste-like slurry --- XRD --- intelligent torque rheometer --- on-site monitoring --- cyclic wetting-drying --- deterioration --- sandstone --- mudstone --- elastic modulus --- uniaxial compressive strength --- permeability characteristics --- grading broken gangue --- compressive stress --- compression deformation --- mine shaft --- alternate strata --- surrounding rock --- shaft lining --- relief excavation --- consolidation process --- unsaturated soil --- semi-analytical solution --- impeded drainage boundary --- excess pore-pressures --- coalbed methane (CBM) --- soft coal masses --- pore structure --- fractal pore characteristics --- hydraulic fractures --- PPCZ --- multitude parameters --- propagation pattern --- stress interference --- naturally fracture --- filtration effects --- grout penetration --- unified pipe-network method --- two-phase flow --- fractured porous medium --- new cementitious material --- cement-based paste discharge --- XRD --- TG/DTG --- SEM --- MIP --- mechanical behaviors --- rock fracture --- shear-flow coupled test --- constant normal stiffness conditions --- transmissivity --- hydraulic aperture --- water inrush prevention --- backfill mining --- strata movement --- ground pressure --- floor failure depth --- water–rock interaction --- degradation mechanism --- mixed mode fracture resistance --- fracture criteria --- T-stress --- hydro-power --- high-steep slope --- fractured rock --- permeability --- seepage control --- gas-bearing coal --- electrical potential --- charge separation --- gas adsorption --- damage evolution --- Unsaturation --- chloride --- concrete --- coupling model --- numerical calculation --- debris flow --- forecasting --- rainfall-unstable soil coupling mechanism(R-USCM) --- scoops3D --- Jiaohe --- non-aqueous phase liquid --- finite element method --- two-phase flow --- mixed-form formulation --- FLAC --- pore structure --- movable fluid --- tight sandstones --- Ordos Basin --- tectonically deformed coal --- coal and gas outburst --- coal-like material --- mechanical properties --- deformation feature --- adsorption/desorption properties --- minerals --- mechanical properties --- uniaxial compressive strength --- crack distribution characteristics --- discrete element method --- lignite --- nitric acid modification --- pore structure --- surface characteristics --- adsorption performance --- n/a

Fluid Flow in Fractured Porous Media

Authors: ---
ISBN: 9783039214730 9783039214747 Year: Volume: 2 Pages: 492 DOI: 10.3390/books978-3-03921-474-7 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-12-09 11:49:15
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Abstract

The fluid flow in fracture porous media plays a significant role in the assessment of deep underground reservoirs, such as through CO2 sequestration, enhanced oil recovery, and geothermal energy development. Many methods have been employed—from laboratory experimentation to theoretical analysis and numerical simulations—and allowed for many useful conclusions. This Special Issue aims to report on the current advances related to this topic. This collection of 58 papers represents a wide variety of topics, including on granite permeability investigation, grouting, coal mining, roadway, and concrete, to name but a few. We sincerely hope that the papers published in this Special Issue will be an invaluable resource for our readers.

Keywords

scanning electron microscope (SEM) images --- permeability --- high temperature --- Darcy’s law --- confining pressures --- chemical grouts --- grain size of sand --- initial water contained in sand --- grouted sand --- macroscopic mechanical behaviors --- microstructure characteristics --- ductile failure --- gas concentration --- gob-side entry retaining (GER) --- limestone roof --- roof-cutting resistance --- roadside backfill body (RBB) --- solid backfill coal mining --- goaf --- water soaked height --- loose gangue backfill material --- deformation --- crushing ratio --- fracture grouting --- cement–silicate grout --- geophysical prospecting --- seepage --- Yellow River Embankment --- contiguous seams --- water-dripping roadway --- roadway deformation --- bolt support --- pervious concrete --- permeability coefficient --- porosity --- pore distribution characteristics --- strength --- soil–structure interface --- internal erosion --- critical hydraulic gradient --- orthogonal tests --- Pseudo Steady-State (PPS) constant --- finite-conductivity fracture --- conductivity-influence function --- normalized conductivity-influence function --- circular closed reservoir --- glutenite --- gravel --- hydraulic fracture --- numerical simulation --- propagation --- glauberite cavern for storing oil &amp --- gas --- thermal-hydrological-chemical interactions --- temperature --- brine concentration --- microstructure --- micro-CT --- damage --- cyclic heating and cooling --- physical and mechanical parameters --- failure mode --- acoustic emission --- anisotropy --- bedding plane orientation --- coal --- gas --- adsorption–desorption --- laboratory experiment --- pore pressure --- hydro-mechanical coupling --- fracture closure --- constitutive model --- effective stress --- debris flow --- dynamic characteristics --- numerical analysis --- debris-resisting barriers --- coal measures sandstone --- creep characteristics --- seepage pressure --- seepage-creep --- microscopic morphology --- Darcy flow --- heterogeneity --- numerical manifold method --- high-order --- refraction law --- hydraulic fracture network --- cohesive element method --- coal seams --- fracture propagation --- discontinuous natural fracture --- secondary fracture --- fault water inrush --- coupled THM model --- nonlinear flow in fractured porous media --- numerical model --- warning levels of fault water inrush --- bentonite-sand mixtures --- differential settlement --- deformation --- hydraulic conductivity --- crack --- geogrid --- enhanced permeability --- deviatoric stress --- mechanical behavior transition --- CH4 seepage --- volumetric strain --- strain-based percolation model --- rock-soil mechanics --- soft filling medium --- segmented grouting --- split grouting --- model experiment --- reinforcement mechanism --- longwall mining --- gob behaviors --- stress relief --- permeability --- gas drainage --- hard and thick magmatic rocks --- orthogonal ratio test --- similar simulation --- fracture --- bed separation --- disaster-causing mechanism --- artificial joint rock --- shear-flow coupled test --- hydraulic aperture --- roughness --- seepage pressure --- mixing --- conservative solute --- fractal --- roughness --- fracture --- transversely isotropic rocks --- failure mechanism --- particle flow modeling --- interface --- n/a --- fractured porous rock mass --- grouting experiment --- visualization system --- flow law --- layered progressive grouting --- sandstone and mudstone particles --- rheological deformation --- segmented rheological model --- rheological limit strain --- rheological test --- water-rock interaction --- dry-wet cycles --- slope stability --- laboratory experiment --- mechanical properties --- Xinjiang --- land reclamation --- management period --- soil particle size --- fluid flow in reclaimed soil --- effluents --- soil properties --- cohesive soils --- contamination --- time variation --- stabilization --- mixer --- viscoelastic fluid --- pore structure --- orthogonal test --- fluid–solid coupling theory --- similar-material --- regression equation --- optimum proportioning --- hydraulic fracturing --- gas fracturing --- oriented perforation --- fracture propagation --- damage mechanics --- fluid viscosity --- CO2 flooding --- supercritical CO2 --- CO2 geological storage --- tight sandstone gas reservoirs --- enhanced gas recovery --- flotation --- coal particle --- collision angle --- initial settlement position --- particle velocity --- adhesion efficiency --- green mining --- paste-like slurry --- XRD --- intelligent torque rheometer --- on-site monitoring --- cyclic wetting-drying --- deterioration --- sandstone --- mudstone --- elastic modulus --- uniaxial compressive strength --- permeability characteristics --- grading broken gangue --- compressive stress --- compression deformation --- mine shaft --- alternate strata --- surrounding rock --- shaft lining --- relief excavation --- consolidation process --- unsaturated soil --- semi-analytical solution --- impeded drainage boundary --- excess pore-pressures --- coalbed methane (CBM) --- soft coal masses --- pore structure --- fractal pore characteristics --- hydraulic fractures --- PPCZ --- multitude parameters --- propagation pattern --- stress interference --- naturally fracture --- filtration effects --- grout penetration --- unified pipe-network method --- two-phase flow --- fractured porous medium --- new cementitious material --- cement-based paste discharge --- XRD --- TG/DTG --- SEM --- MIP --- mechanical behaviors --- rock fracture --- shear-flow coupled test --- constant normal stiffness conditions --- transmissivity --- hydraulic aperture --- water inrush prevention --- backfill mining --- strata movement --- ground pressure --- floor failure depth --- water–rock interaction --- degradation mechanism --- mixed mode fracture resistance --- fracture criteria --- T-stress --- hydro-power --- high-steep slope --- fractured rock --- permeability --- seepage control --- gas-bearing coal --- electrical potential --- charge separation --- gas adsorption --- damage evolution --- Unsaturation --- chloride --- concrete --- coupling model --- numerical calculation --- debris flow --- forecasting --- rainfall-unstable soil coupling mechanism(R-USCM) --- scoops3D --- Jiaohe --- non-aqueous phase liquid --- finite element method --- two-phase flow --- mixed-form formulation --- FLAC --- pore structure --- movable fluid --- tight sandstones --- Ordos Basin --- tectonically deformed coal --- coal and gas outburst --- coal-like material --- mechanical properties --- deformation feature --- adsorption/desorption properties --- minerals --- mechanical properties --- uniaxial compressive strength --- crack distribution characteristics --- discrete element method --- lignite --- nitric acid modification --- pore structure --- surface characteristics --- adsorption performance --- n/a

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