... stress anisotropy of 8 to 12%. Estimates of the σ h are consistent with the LOT data and the formations did not show any borehole breakout, yet σ H was found to be greater than σ h min. The third-order elastic constants c 144 and c 155 were found to be consistent with laboratory values...

... behavior of intact rock, the spatial configuration of joint sets, and mechanical behavior of the joint plane on the non-linear behavior of a rock mass, this manuscript reveals the joint-induced anisotropy in failure zone and deformation surrounding a tunnel. The support effects of a rockbolt are generally...

... uniaxial failure strength bedding plane sandstone strength anisotropy anisotropy ABSTRACT A series of uniaxial and triaxial tests are conducted on core samples of sandstone from Hunan highway region in China. The influence of the inherent anisotropy of sandstone on the mechanical...

...ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods Effects of Discontinuities Dip-Direction on Anisotropy Strength A. Ghazvinian & M.R. Hadei Tarbiat Modares University, Tehran, Iran 1 INTRODUCTION Discontinuities are one...

... fracture mechanics specimen toughness anisotropy microcrack backer loading propagation hydraulic fracturing fracture toughness pressure experiment punch-through shear ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods 1...

... ABSTRACT A constitutive coupled plasticity-damage formulation based on fabric tensor and discrete approach is proposed for modeling inherent and induced anisotropy in cohesive-frictional geomaterials. Fabric tensor is used to characterize the inherent orientation-dependent properties...

... specimen fracture perpendicular specimen axis rock fracture capillary pressure curve capillary pressure anisotropy ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods 1 1 INTRODUCTION Rock fracture is a crucial geological...

... testing procedure of the overcored rock sample with the cell was developed. The effect of the degree of rock anisotropy on in situ stress determination and the error involved in neglecting rock anisotropy are analysed. Differences on the principal stresses and principal directions calculated considering...

...ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods 1,12 1,14 1 1 INTRODUCTION Rocks are in general anisotropic with regard to their physical and mechanical properties. Evident anisotropy is especially observed among...