WebThe anisotropy strength ratio (the ratio of the maximum compressive strength to the minimum strength) over the full range of the lamination orientations was determined. The results of the uniaxial compressive strength tests were compared with the strength anisotropy index ratio [I S (50)] determined from the point load strength tests. WebMay 1, 2024 · In this study, the anisotropic rock properties of the argillite in the Naparima Hill Formation, Trinidad, an unconventional reservoir, was studied in laboratory experiments. A series of laboratory measurements including permeability, P- and S-wave velocities, and compressive strength were conducted at effective pressures of up to 130 MPa.
Anistotropic yielding of rocks at high temperatures and pressures
WebJun 19, 1989 · Synthetic "sandstones" have been formed under controlled anisotropic stress conditions. Anisotropies in acoustic (P- and S-wave) velocities, magnetic susceptibility, permeability, Young's modulus and rock strength have been measured on the unloaded cores. Rock porosities have also been studied. The petrophysical parameters measured, … WebThe initial strengths of the soft and hard rocks in the composite rock formations were approximately 10 MPa, 20 MPa, and 30 MPa. The physical and mechanical parameters of the soft and hard rocks are listed in Table 1. The … medivh\\u0027s journal location
Strength Control Factors of Chlorite Schist under Schistose ... - IIETA
WebFeb 1, 2024 · The anisotropy of rock is caused by any directional or planar features such as mineral composition, grain size, crystal size, fabric, porosity, weathering, microstructure, joints, fractures and faults ( Ramamurthy et al., 1993, Behrestaghi et al., 1996, Bagde, 2000, Cho et al., 2012, Kim et al., 2012, Khanlari et al., 2014, Wong et al., 2015 ). WebAug 14, 2015 · The strength anisotropy of various rock types has been studied in compression tests by different researchers such as Donath ( 1964 ), McLamore and Gray ( 1967 ), Hoek ( 1968 ), Attewell and Sandford ( 1974 ), and Brown et al. ( 1977) on shales and slates, Ramamurthy et al. ( 1988) on phyllites, Akai et al. ( 1970 ), McCabe and Koerner ( … WebAbstract. The lack of a continuous 3-dimensional yield condition to describe an anisotropic compacting material prompted this study. Most yield conditions are limited to isotropic materials and a Coulomb yield condition is generally used to describe rocks and soils, since it allows for increasing strength with an increase in confining pressure. medivh\u0027s footlocker wow