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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.

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