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高速公路冲沟浅埋段通常地质环境复杂,围岩条件差,开挖过程极易发生塌方灾害。通过对福建漳永高速公路仁竹山隧道冲沟段塌方灾害的分析,得到了该隧道塌方的具体类型,并对塌方的发生规模及基本特征进行了研究。在此基础上,采用FLAC3D有限差分软件建立仁竹山隧道的地质力学模型,对隧道塌方灾害的发生机制进行了数值计算,重点分析隧道开挖经过冲沟浅埋段时,围岩位移、应力和塑性发展情况,计算结果与实际塌方过程基本吻合。研究成果可为今后类似工程灾害的规避提供参考。
Shallow buried sections of highway gully usually have complex geological environment, poor surrounding rock conditions and prone to landslide hazard during excavation. By analyzing the landslide hazard in the Beilu section of the Renzhushan tunnel on the Zhangyong Expressway in Fujian Province, the type of landslip in the tunnel was obtained and the occurrence scale and basic characteristics of the landslide were studied. On this basis, using FLAC3D finite difference software to establish the Renqingshan tunnel geomechanical model, the tunnel collapse hazards of the mechanism of numerical calculation, focusing on analysis of tunneling through gorges shallow buried section, the surrounding rock displacement, stress and Plasticity development, the calculation results and the actual collapse process is basically consistent. The research results can provide a reference for future similar project disaster avoidance.