Influence of pore pressure on plastic deformation and strength of limestone under compressive stress
Influence of pore pressure on plastic deformation and strength of limestone under compressive stress
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DOI：
10.1007/s11440-018-0658-1
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发表时间：
2019-04-01
期刊：
影响因子：
5.7
通讯作者：
Shao, J. F.
中科院分区：
文献类型：
--
作者：
Han, B.;Shen, W. Q.;Shao, J. F.
本研究致力于研究孔压对饱和水灰岩塑性变形和破坏的影响。实验研究由三组不同的实验室测试组成。岩石的基本力学行为首先是在没有孔压的饱和水样品上进行排水三轴压缩试验。并将计算结果与前人对等孔压饱和土样进行三轴压缩试验的结果进行了比较。第二组进行围压为20 Mpa、不同偏应力值的注水试验，研究孔压升高的效果。最后，进行了不排水三轴压缩试验，研究了塑性变形与孔压变化的耦合效应。根据试验数据，讨论了塑性屈服和破坏强度的有效应力概念的正确性。
This study is devoted to experimental investigation of effects of pore pressure on plastic deformation and failure of a water-saturated limestone. The experimental study is composed of three different groups of laboratory tests. The basic mechanical behavior of the rock is first characterized by drained triaxial compression tests on water-saturated samples without pore pressure. The results are compared with those obtained in a previous study from triaxial compression tests on saturated samples with a constant pore pressure. In the second group, water injection tests under a confining pressure of 20 MPa and different values of deviatoric stress are realized to study the effect of pore pressure increase. Finally, undrained triaxial compression tests are carried out for investigating the coupling effect of plastic deformation and pore pressure variation. Based on experimental data, the validity of effective stress concept for plastic yielding and failure strength is discussed.