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结合张石高速公路隧道工程的具体实践,对隧道开挖后形成的围岩松动圈进行研究,探讨其合理的模拟技术。首先基于隧道开挖后的围岩应力分布特点,将围岩的松动破坏区与松动区进行区分,进而从概念上对围岩松动圈的形成机理进行详细的阐述;随后应用极限拉应变准则对围岩松动圈进行了数值模拟分析,并重点介绍了各级围岩的极限拉应变值的选取原则。最后通过数值模拟结果与现场声波测试值、规范计算值的对比分析,充分验证了使用极限拉应变准则进行隧道围岩松动圈模拟的合理性和实用性。
Combined with the concrete practice of Zhangshi expressway tunnel project, the loose ring of surrounding rock formed after tunnel excavation is studied, and its reasonable simulation technology is discussed. First of all, based on the stress distribution characteristics of surrounding rock after tunnel excavation, the loosening failure zone and loose zone of surrounding rock are distinguished, and then the forming mechanism of the loose ring of surrounding rock is described in detail. Then the ultimate tensile strain criterion The surrounding rock loose ring was numerically simulated and analyzed, and the selection principle of ultimate tensile strain at all levels of surrounding rock was emphatically introduced. Finally, by comparing and analyzing the numerical simulation results with the on-site acoustic wave test values and the standard calculated values, the rationality and practicability of using the limit tensile strain criterion to simulate the surrounding rock loosening circle are fully verified.