... dependence of permeability on pore pressure is captured by taking into account Knudsen and slip flow contributions. Because depletion-induced variation of pore pressure leads to variation of eigen-strain, the resultant strain and stress exerted at the reservoir by surrounding country rock is found by using...

...), the elastic strain tensor eij has the following form: where ij is the Kronecker delta tensor. Equation (7) shows that the increment of elastic strain tensor d eij is Figure 1. Variations of plastic flow angle 1 and viscoplastic flow angle 2 . where 1 = 3/4b1I 1/21 + 2b2I 31 J2, 2 = b2I 21 , and 3 = b2I...

... criterion, which neglects the role of σ 2 , predicting only the lower limit of rock strength for a given σ 3 . strength crystalline rock characteristic Upstream Oil & Gas variation specimen compressive strength Coconino sandstone principal stress Reservoir Characterization Triaxial...

..., and the results were compared with those in the groundwater before test. The mineral morphologies of fracture surfaces before and after test were also examined through SEM scanning. Test results show that there are no obvious variations of SiO 2 and Al 3+ in the outlet solution during the process of seepage...

... deformation situations by multiplying various constants. Several simple examples with load variation on boundaries are introduced to demonstrate the proposed method. Lining displacements in each example are decomposed as linear combination of character- istic modes. Diagrammatic illustrations indicate...

... to analyze the permeability variation of the given fractured rock masses considering different geometric parameters of the rock fractures. These numerical simulations showed that the principal permeability increased with the increase of the fracture length and fracture density, and for the trend of the two...

... model Upstream Oil & Gas variation joint plane strength Reservoir Characterization plane parallel failure zone anisotropic deformation rock mass anisotropy rockbolt Huang excavation deformation jointed rock mass tunnel tunnel wall Rock Characterisation, Modelling and Engineering...

...), where = friction angle along the plane of weakness. 3 ANISOTROPY 3.1 Inherent Anisotropy In this type of anisotropy, the weak surfaces are related to the rock formation processes, such as the foliation and ABSTRACT Discontinuities are responsible for mechanical anisotropy causing directional variation...

... variation Deformational Characteristic shear stress volumetric strain dilation loading constitutive model Upstream Oil & Gas sandstone moduli deformation behavior hydrostatic stress Reservoir Characterization anisotropic degradation weak sandstone volumetric deformation...

... the FLAC3D code. The effects of variations in rock mass deformation modulus on the strain/stress relaxation, and thus borehole slotter test results, were investigated numerically. The validity of numerical findings were discussed and compared against practical observations. Accordingly, the borehole slotter...

... FORMULATIONS In this model, the assumption of small strains is adopted. As classically, the total strain is decomposed into an elastic part and a plastic part, and ?eE pE The variation of compliance tensor with an inclination angle is taken into account in the following matrix form proposed by Lemaitre et...

... Reservoir Characterization Fluid Dynamics three-dimensional failure process variation hydraulic fracturing rock element Simulation Upstream Oil & Gas modeling damage variable coefficient fluid flow elastic damage constitutive law permeability evolution mechanics flow...

... Reservoir Characterization lower fault coupling relationship detection temperature field Upstream Oil & Gas anomaly strain field IRR temperature Modeling & Simulation tectonic activity variation Earthquake structural geology rock sample loading strain position fracture...

... the strain measurements and for calculating the elastic constants from the biaxial tests. Reservoir Characterization core axis variation Poisson interpretation reservoir geomechanics mean quadratic deviation strain gauge anisotropy determination Upstream Oil & Gas Artificial...

... parameter instrument monitoring strata variation underground mining underground coal mining investigation peak value instrumentation 1 INTRODUCTION Monitoring and measurements of different strata control parameters during underground mining is, generally, done for safety of working, field...

... expanding for siliceous-lime marble. 1 INTRODUCTION W.F. Brace et al. conducted early the experiment of electrical resistance changing with stress of rock and owed the variation to the dilation of bulk [1–2] . On what has already been achieved, the basic law of electrical conduction of rock containing...

... wave velocity MASW Upstream Oil & Gas surface wave Reservoir Characterization variation velocity profile Artificial Intelligence surface strata shear wave velocity classification system assessment rippability assessment excavation characteristic limestone dispersion curve...