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采用数值模拟方法研究软硬互层岩石材料在不同围压条件下的压缩破坏过程。利用改进刚体弹簧方法,模拟细观裂隙的起裂和扩展过程。界面破坏准则结合莫尔–库仑准则和抗拉强度准则,能同时考虑拉裂和剪切2种破坏模式。岩石材料由以Voronoi图形为基础的块体集合表征为显式模拟结构面,提出一种分步插点的计算网格自动生成算法。对已有的典型实验进行计算,模拟得到不同围压下不同倾角数值试件的破坏模式和抗压强度。与实验结果的对比表明,改进刚体弹簧方法能够定性和定量地描述由于软硬互层结构引起的抗压强度各向异性,不同围压条件下得到的破坏模式也与实验结果吻合良好。
The numerical simulation method is used to study the compressive failure process of soft and hard interbedded rock materials under different confining pressures. Using the improved rigid-body spring method, the initiation and propagation of meso-fracture are simulated. Interfacial failure criterion Combining Mohr-Coulomb criterion and tensile strength criterion, we can consider two failure modes, ie, fracture and shearing simultaneously. The rock material is characterized by a set of blocks based on the Voronoi graph as an explicit simulation structural plane, and an algorithm for calculating the mesh of step-by-step interpolation points is proposed. Based on the existing typical experiments, the failure mode and compressive strength of numerical specimens with different inclination angles under different confining pressure were simulated. The comparison with the experimental results shows that the improved rigid body spring method can qualitatively and quantitatively describe the anisotropy of compressive strength due to the hard and soft interlaminar structure. The failure modes obtained under different confining pressures also agree well with the experimental results.