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通过轮廓法追踪岩石裂纹扩展轨迹,将其嵌入ABAQUS扩展有限元(EFE)平台,对单轴压力下裂隙试件受压过程进行了模拟验证,裂纹起裂扩展效果良好。以此为平台,将推导得到的弧形裂纹应力强度因子嵌入其中,以最大周向拉应力准则为开裂准则,认为当其大于岩体断裂韧度时,硐室围岩体内初始裂纹将开始扩展。在此基础上,以发现分区破裂现象的圆形隧道模型试验为背景开展了分区破裂的数值模拟试验。模拟结果发现,深部巷道围岩出现了3~4层破裂分区,证实深部巷道围岩存在分区破裂现象。将数值模拟结果与模型试验完成后模型围岩破坏状态对比,发现二者破裂区分布特征基本一致。数值模拟结果表明,EFEM方法在处理复杂岩体裂纹问题方面的有效性。
The trajectory of rock crack propagation was tracked by the contour method and embedded into the ABAQUS extended finite element (EFE) platform. The compression process of the crack specimen under uniaxial compression was simulated and the cracking initiation and propagation effects were well verified. Based on this platform, the derived stress intensity factor of arc crack is embedded in it. According to the criterion of maximum circumferential tensile stress, the initial crack in surrounding rock will begin to expand when it is larger than the fracture toughness . On the basis of this, the numerical simulation test of zonal disintegration is carried out on the basis of the circular tunnel model test for the discovery of zonal disintegration. The simulation results show that there are 3 ~ 4 layers of rupture zones in the surrounding rock of deep laneway, which proves the existence of sub-area rupture in the deep laneway. Comparing the numerical simulation results with the failure state of the surrounding rock model after the completion of the model test, it is found that the distribution characteristics of the rupture zone are basically the same. The numerical simulation results show that the EFEM method is effective in dealing with the crack of complex rock mass.