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现有关于水力劈裂的研究成果多基于宏观连续介质方法,难以揭示水力劈裂细观机制,借助颗粒离散元在材料破碎及裂纹动态发展研究方面的优势,提出从细观层面实现裂纹扩展动态分析的PFC-CFD联合求解法,并采用圆环岩体试件的简化模型验证了该方法的可行性。随后以一隧洞工程为背景,采用该方法对隧洞开挖过程中裂纹扩展情况进行模拟,分析非稳定渗流阶段,掌子面与高压水源距离不同(掘进过程)对隧洞裂纹扩展的影响。研究结果表明:建立的耦合分析方法能够较好地模拟岩体水力劈裂的破坏过程,可用于隧洞工程的安全性评价。
The existing researches on hydraulic fracturing are mostly based on the macroscopic continuum method and it is difficult to reveal the meso-mechanism of hydraulic fracturing. Based on the advantages of particle dispersive element in the study of material fracture and dynamic crack growth, it is proposed that the propagation of the crack at the mesoscopic level The PFC-CFD joint solution method is analyzed, and the simplified model of the ring rock specimen is used to verify the feasibility of the method. Then based on a tunnel project, this method is used to simulate the crack propagation in the tunnel excavation. The influence of tunneling crack propagation in the unsteady seepage stage and the distance between the face and the high-pressure water source is analyzed. The results show that the coupling analysis method established can well simulate the failure process of hydraulic fracturing of rock mass and can be used for the safety evaluation of tunnel engineering.