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详细地研究了闭合裂纹在单轴、双轴载荷作用下,裂隙扩展、贯通的规律,应用8节点奇异等参单元模型来模拟节理尖端应力场的奇异性,实验和数值计算结果所得到的闭合裂隙的扩展规律具有较好的一致性,实验结果对研究裂隙岩体在开挖卸荷条件下的力学特性具有一定的参考价值。最后,将砂岩圆柱梁三点弯曲测试验得到的KIC,计算万家寨引黄工程总干一、二级泵站地下厂房在开挖和支护过程中围岩的破损区。
In this paper, the crack growth and penetration are studied in detail under uniaxial and biaxial loads. The singular isoparametric 8-node isoparametric element model is used to simulate the singularity of the tip stress field. The experimental and numerical results of the closed The crack propagation law has good consistency. The experimental results have certain reference value to study the mechanical behavior of fractured rock mass under the condition of excavation and unloading. Finally, the KIC obtained from the three-point bending test of the sandstone cylindrical beam is used to calculate the damaged area of the surrounding rock during excavation and support of the underground powerhouse of the No. 1 and No. 2 pumping station of Wanjiazhai Yellow River Diversion Project.