三维应力状态下各向异性结构面的剪切特性

The Theoretical Investigation on Shear Property ofAnisotropic Discontinuity under Three-dimensional Stress State

从地应力场中结构面的原型出发，考虑锯齿状结构面的空间起伏形态及其与三维应力场间的相互作用关系，通过理论分析获得了在侧向自由位移及约束位移两类不同边界条件下三维应力场中结构面的实际滑移方向、剪切的各向异性剪胀特性（法向和侧向）及强度特性等表达式，以及侧向约束位移条件下约束应力的增量公式。最后利用实验结果进一步说明了结构面形态及三维应力场对其剪切力学特性的影响规律。

Based on the original characteristics of discon tinuity in crustal stress field,considering the spatial shape of Jagged discontinuity and its velation with stress field,these formulasof shear motion direction,the anisotropic dilatancy(normal and widespread)and strength proportyof discontinuitv in three-dimensional stress field are derived under two different boundary conditionsof free and restraining displacement, and the widespread stress in crement under the displacementbeing restrained can be calculated.Pinally the anisotropic rules of discontinuity in three-dimensionalstress field are also confirmed by experimental data.