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为明确隧道开挖时易于引发安全事故的关键位置并预测地层变形趋势,以保证隧道施工和周围构(建)筑物的安全,采用Ansys通用有限元软件对北京地铁7号线广双区间隧道开挖过程进行了数值模拟分析,并结合实际监测结果对隧道开挖过程中地层变形和应力重分布的变化规律和安全关键位置进行了总结;通过对随机介质理论方法的优化研究,推导出简单可行的优化计算公式。结果表明,隧道开挖中拱顶、拱腰和拱脚位置为变形较大和应力分布集中的关键安全位置,优化后的随机介质法计算公式用于地表沉降的安全预测分析是可靠的。
In order to clarify the key position of accident prone to cause accidents and predict the trend of deformation in tunnel excavation, in order to ensure the safety of tunnel construction and surrounding structures, Ansys general finite element software is used to analyze the tunnels of wide-double tunnels of Beijing Metro Line 7 Excavation process of the numerical simulation analysis, combined with the actual monitoring results of the tunnel during the excavation process of deformation and stress redistribution of the law of change and safety critical positions were summarized; through the optimization of stochastic medium theory method, derived simple Feasible optimization formula. The results show that the positions of vault, arch waist and arch are the key safety positions with large deformation and stress distribution in tunnel excavation. The optimized stochastic medium method is reliable for predicting the safety of ground subsidence.