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对岩石类材料,各向异性状态参数定义为材料微观结构偏张量与标准化的偏应力张量之间的联合不变量。通过在扩展的Lade-Duncan破坏准则内耦合各向异性状态参数,建立起了横观各向同性岩土类材料的破坏准则,并结合Tournemire页岩的三轴试验资料进行了验证工作。当加荷方向与材料沉积方向的夹角在30°~60°范围时,预测出的岩石强度处于最小区域,从而达到了较好地对横观各向同性岩石的破坏强度进行合理预测的目的。
For rock-like materials, the anisotropic state parameter is defined as the joint invariant between the material microstructure partial tensor and the normalized deviatoric stress tensor. By coupling anisotropic state parameters into the extended Lade-Duncan failure criterion, the damage criterion of transversely isotropic geotechnical materials is established and verified with the triaxial test data of the Tournemire shale. When the angle between the direction of loading and the direction of material deposition is in the range of 30 ° -60 °, the predicted rock strength is in the minimum area, so as to achieve the purpose of reasonably predicting the damage intensity of transversely isotropic rock .