Four compressibilities are defined for porous rock, relating changes in the bulk and pore volumes to confining pressures. Using a micromechanical theory based on classical linear elasticity, three relations found between these compressibilities. Two of verified experimentally Berea Bandera sandstone. Bounds derived compressibilities, involving only porosity elastic moduli rock‐forming minerals. For strains be unique functions stresses must difference This dependence is Berea, Bandera, Boise...

Abstract The reduction from three‐ to two‐dimensional analysis of the permeability a fractured rock mass introduces errors in both magnitude and direction principal permeabilities. This error is numerically quantified for porous by comparing equivalent three‐dimensional fracture networks with values computed on arbitrarily extracted planar trace maps. A method compute full tensor discrete matrix models described. based element‐wise averaging pressure flux, obtained finite element solution...

A fully coupled thermal-hydraulic-mechanical (THM) finite element model is presented for fractured geothermal reservoirs. Fractures are modelled as surface discontinuities within a three-dimensional matrix. Non-isothermal flow through the rock matrix and fractures defined to mechanical deformation model. robust contact utilised resolve tractions between opposing fracture surfaces under THM loadings. numerical has been developed using standard Galerkin method. Quadratic tetrahedral triangular...

A new dual‐porosity model is developed for single‐phase fluid flow in fractured/porous media. Flow assumed to take place through the fracture network and between fractures matrix blocks. The blocks are treated a lumped parameter manner, with single average pressure used each block. Rather than assuming that fracture/matrix flux proportional difference at point, as done Warren‐Root model, we use nonlinear equation which more accurately models over all time regimes, including both early late...

Available experimental investigations on the effect of aggregate–paste ‘interfacial transition zone' (ITZ) mass transport properties cement-based materials appear to be ambiguous. While some studies have found a deleterious ITZ, results from others seem suggest otherwise. The present study examines relative influences ITZ and microcracking oxygen diffusivity, permeability water sorptivity, further enhance understanding links between microstructure properties. Specimens several neat cement...

Abstract The exact solution is derived for the problem of uniformly heating a cylinder whose elastic moduli and thermal expansion coefficient vary linearly with radius. shows that radial tangential stresses are largest in magnitude at center whereas deviatoric stress outer edge cylinder. effective found to be essentially given by volumetric average local coefficient, variation having only small effect. In case material uniform but spatially variable coeffi cient exactly equal average; this...

During hydrostatic compression conducted within the elastic regime, P and S‐wave velocities measured on porous rock samples generally increase with pressure reach asymptotic values at high pressures. The in can be attributed to gradual closure of compliant cracks, which case high‐pressure reflect only influence stiff, non‐closable pores. A procedure is presented extract complete pore aspect ratio distribution from dependence dry velocities, assuming that contains a cracks different ratios,...