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- W4206646228 abstract "Rocks exhibit stress dependent wave velocities when their constitutive behaviour shows nonlinear elasticity. The main physical mechanism responsible for stress dependency is opening or closure of cracks, which is particularly important in brittle rocks. Crack formation is also associated with breaking of grain contacts. We observe, by using synthetic sandstones formed under stress, a strong stress dependence during unloading (simulated coring). The reloaded material also shows a strong stress dependency, in particular at stress levels below the virgin stress state, but also above. Thus, stress dependency as seen in cores taken from great depth is mainly a result of core damage. Stress independency is associated with linear elasticity (such as in well cemented rocks, or near the virgin stress conditions; as observed here with synthetic sandstones), but also occurs in ductile materials where there is a strong component of plasticity. We demonstrate stress independence in synthetic sandstone at stress close to the virgin stress state (in the elastic regime), but also well above (in the non-elastic deformation regime). High porosity, high clay content shale was found to rather stress insensitive. This is thought to be a result of the ductility of the rock, caused mainly by the strong affinity of water to clay mineral surfaces." @default.
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- W4206646228 date "1997-04-01" @default.
- W4206646228 modified "2023-09-26" @default.
- W4206646228 title "Hydraulic fracturing simulation in parallel computing environments" @default.
- W4206646228 doi "https://doi.org/10.1016/s0148-9062(97)00059-4" @default.
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