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The phenomenon of soil–structure interactions in marine environments has attracted great attention from coastal geotechnical engineers in recent years. One of the reasons for the growing interest is the rapid development of marine resources (such as in the oil and gas industry, marine renewable energy, and fish farming industry) as well as the damage to marine infrastructure that has occurred in the last two decades. To assist practical engineers in the design and planning of coastal geotechnical projects, a better understanding of the mechanisms of soil–structure interactions in marine environments is desired. This Special Issue reports the recent advances in the problems of structure–seabed interactions in marine environment and provides practical engineers and researchers with information on recent developments in this field.

Technology: general issues --- wave-seabed-structure interactions --- mesh-free model --- local radial basis function collocation method --- oscillatory liquefaction --- irregular wave --- sand --- void ratio --- disturbed state concept --- disturbance function --- constitutive model --- seepage failure --- critical hydraulic gradient --- excess pore pressure --- fluidization degree --- resuspension --- soil --- liquefaction --- fractional order --- cyclic mobility --- spudcan --- stiffness --- reduction --- finite element analysis --- dual-stage Eulerian–Lagrangian technique --- slope stability --- immersed tunnel --- solitary wave --- foundation trench --- numerical modeling --- scour --- marine structures --- numerical modelling --- sediment transport --- Biot’s equations --- multiphase theory --- RANS equations --- seabed --- in situ test --- liquefied submarine sediments --- rheological characteristics --- pile jacking --- consolidation effect --- saturated fine-grained soil --- excess pore water pressure --- pile set-up --- side shear resistance --- hybrid Lagrangian–ALE method --- n/a --- dual-stage Eulerian-Lagrangian technique --- Biot's equations --- hybrid Lagrangian-ALE method

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This book, “Clay Mineral Transformations after Bentonite/Clayrocks and Heater/Water Interactions from Lab and Large-Scale Tests”, covers a broad range of relevant and interesting topics related to deep geological disposal of nuclear fuels and radioactive waste. Most countries that generate nuclear power have developed radioactive waste management programmes during the last 50 years to emplace long-lived and/or high-level radioactive wastes in a deep underground repository in a suitably chosen host rock formation. The aim is to remove these wastes from the human environment. If a site is properly chosen, a repository system comprising both natural and engineered barriers would provide a high level of protection from the toxic effects of the waste.The 17 papers published in this Special Issue show that bentonites and clayrocks are an essential component of the multi-barrier system ensuring the long-term safety of the final disposal of nuclear waste. The efficiency of such engineered and natural clay barriers relies on their physical and chemical confinement properties, which should be preserved in the long-term.

Research & information: general --- Biology, life sciences --- calcium bentonite --- gel --- swelling --- water uptake --- ESEM --- EDXA --- surface area --- XRD --- radioactive waste disposal --- cement–clay interaction --- bentonite --- cementitious materials --- alteration --- alkaline conditions --- radioactive waste --- cement-clay interaction --- OPC --- LAC --- alkaline leachate --- cement—clay interaction --- diffusion --- dual porosity --- electrostatic effects --- reactive transport modelling --- near field --- radioactive waste repository --- low-pH cement --- technical barrier --- Äspö --- ABM-test --- smectite alteration --- swelling pressure --- permeability --- hydraulic gradient --- engineered barriers --- geological repository --- selenium reduction --- sorption --- Opalinus Clay --- in situ --- batch tests --- smectite --- crystal structure --- water in the smectite interlayer --- mineralogical changes --- thermal treatment --- BET --- swell index --- liquid limit --- water retention curves --- iron --- in situ experiment --- interface --- layer charge --- metal substitution --- SEM–EDS --- microbial diversity --- organic supplements --- magnesium bentonite --- thermal loading --- montmorillonite content --- thermal analysis with evolved gas analysis --- cation exchange capacity --- specific surface area --- saturated hydraulic conductivity --- microbial survivability --- HLRW --- ABM test --- SEM-EDX --- repository --- high temperatures --- ordinary Portland cement --- mudstone --- sequential flow experiment --- reactive-transport modelling --- anion distribution --- CEC --- exchangeable cations --- hydration --- MiniSandwich --- sandwich sealing system --- solute transport --- waste repositories --- water content --- Milos --- interlayers --- iron–bentonite interaction --- reactive transport --- numerical model --- bentonites --- smectites --- pore water chemistry --- mineralogy --- cation exchange --- ABM experiment --- large-scale tests --- n/a --- Äspö --- SEM-EDS --- iron-bentonite interaction

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This book, “Clay Mineral Transformations after Bentonite/Clayrocks and Heater/Water Interactions from Lab and Large-Scale Tests”, covers a broad range of relevant and interesting topics related to deep geological disposal of nuclear fuels and radioactive waste. Most countries that generate nuclear power have developed radioactive waste management programmes during the last 50 years to emplace long-lived and/or high-level radioactive wastes in a deep underground repository in a suitably chosen host rock formation. The aim is to remove these wastes from the human environment. If a site is properly chosen, a repository system comprising both natural and engineered barriers would provide a high level of protection from the toxic effects of the waste.The 17 papers published in this Special Issue show that bentonites and clayrocks are an essential component of the multi-barrier system ensuring the long-term safety of the final disposal of nuclear waste. The efficiency of such engineered and natural clay barriers relies on their physical and chemical confinement properties, which should be preserved in the long-term.

Research & information: general --- Biology, life sciences --- calcium bentonite --- gel --- swelling --- water uptake --- ESEM --- EDXA --- surface area --- XRD --- radioactive waste disposal --- cement-clay interaction --- bentonite --- cementitious materials --- alteration --- alkaline conditions --- radioactive waste --- OPC --- LAC --- alkaline leachate --- diffusion --- dual porosity --- electrostatic effects --- reactive transport modelling --- near field --- radioactive waste repository --- low-pH cement --- technical barrier --- Äspö --- ABM-test --- smectite alteration --- swelling pressure --- permeability --- hydraulic gradient --- engineered barriers --- geological repository --- selenium reduction --- sorption --- Opalinus Clay --- in situ --- batch tests --- smectite --- crystal structure --- water in the smectite interlayer --- mineralogical changes --- thermal treatment --- BET --- swell index --- liquid limit --- water retention curves --- iron --- in situ experiment --- interface --- layer charge --- metal substitution --- SEM-EDS --- microbial diversity --- organic supplements --- magnesium bentonite --- thermal loading --- montmorillonite content --- thermal analysis with evolved gas analysis --- cation exchange capacity --- specific surface area --- saturated hydraulic conductivity --- microbial survivability --- HLRW --- ABM test --- SEM-EDX --- repository --- high temperatures --- ordinary Portland cement --- mudstone --- sequential flow experiment --- reactive-transport modelling --- anion distribution --- CEC --- exchangeable cations --- hydration --- MiniSandwich --- sandwich sealing system --- solute transport --- waste repositories --- water content --- Milos --- interlayers --- iron-bentonite interaction --- reactive transport --- numerical model --- bentonites --- smectites --- pore water chemistry --- mineralogy --- cation exchange --- ABM experiment --- large-scale tests

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Exceptional loads on buildings and structures may have different causes, including high-strain dynamic effects due to natural hazards, man-made attacks, and accidents, as well as extreme operational conditions (severe temperature variations, humidity, etc.). All of these aspects can be critical for specific structural typologies and/or materials that are particularly sensitive to external conditions. In this regard, dedicated and refined methods are required for their design, analysis, and maintenance under the expected lifetime. There are major challenges related to the structural typology and material properties with respect to the key features of the imposed design load. Further issues can be derived from the need for risk mitigation or retrofit of existing structures as well as from the optimal and safe design of innovative materials/systems. Finally, in some cases, no appropriate design recommendations are available and, thus, experimental investigations can have a key role within the overall process. In this Special Issue, original research studies, review papers, and experimental and/or numerical investigations are presented for the structural performance assessment of buildings and structures under various extreme conditions that are of interest for design.

damping device --- seismic design --- design base shear --- nonlinear response history analysis --- liquid storage tank --- earthquake --- wind --- dynamic response --- fluid–solid interaction --- composite shear wall --- seismic behavior --- quasi-static test --- design strength model --- bored-pile --- global strain extensometer --- pile friction resistance --- real-time monitoring --- snow–wind combined experiment facility --- snowdrift --- field observation --- scale experiments --- similarity criterion --- underwater explosion --- composite pressure hull --- whipping --- breathing --- failure index --- laminated glass (LG) --- free vibrations --- fundamental frequency --- mechanical restraints --- field experiments --- analytical modelling --- Finite Element (FE) numerical modelling --- super large cooling tower --- whole construction process --- wind vibration coefficient --- buckling stability --- ultimate bearing capacity --- snow load --- complex roof --- EOF analysis --- characteristics decomposition --- RABT fire curve --- fire simulation --- tunnel fire --- high temperature --- fire safety --- fire accident --- vertical earthquake motion --- seismic response --- atrium-style metro station --- shaking table test --- wind characteristics --- boundary layer --- typhoon --- hurricane --- field measurement --- train derailment --- derailment containment provisions --- collision testing --- post-derailment behavior --- slurry pipe jacking --- friction resistance --- effective friction coefficient --- pipe-soil-slurry interaction --- lubrication efficiency --- concrete --- blast load --- Monte Carlo analysis --- seismic demand --- pushover --- suction caisson --- suction penetration --- soil plug --- hydraulic gradient --- visual tests --- mountainous valley --- bridge site --- boundary transition section (BTS) --- numerical simulation --- wind tunnel test --- small radius TBM interval --- equivalent continuous model --- Winkler elastic foundation beam theory --- transfer matrix method --- horizontal axis deviation --- tall timber buildings --- timber composites --- seismic retrofitting --- Eurocode 8 --- structural assessment --- masonry buildings --- earthquakes --- seismic loads --- existing structures --- reliability --- rehabilitation --- risk --- blast loading --- welded haunch connection --- steel frame structures --- non-linear dynamic analysis --- ABAQUS --- multiple degree of freedom (MDOF) --- frame ductility ratio --- n/a --- fluid-solid interaction --- snow-wind combined experiment facility

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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