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基于损伤效应,采用有限元软件建立隧道洞口段三维数值模型,并结合现场监测分析考虑与不考虑损伤范围两种情况下麻栗垭隧道洞口段稳定性与安全性.由爆破实验结果得出爆破损伤影响范围约为5.0m,通过与现场监测数据对比可知,考虑围岩损伤效应后数值模拟能更准确反映围岩应力、应变分布规律.经检验,工程支护体系具有足够的安全度.考虑损伤效应后的模拟结果与现场监测值更加符合,拱顶沉降和周边收敛误差分别减小了12.1%和32.8%,数值模拟误差明显降低.运用监控量测与数值模拟相互印证的方法可以更准确地分析隧道结构的稳定性,更好地指导施工,从而为麻栗垭隧道及类似地质下的隧道设计和施工提供理论依据.
Based on the damage effect, the finite element software was used to establish the three-dimensional numerical model of the tunnel entrance section and the stability and safety of the tunnel entrance section of Malibuya tunnel with or without consideration of the damage area. The blasting results The damage impact range is about 5.0m. Comparing with the on-site monitoring data, it can be known that the numerical simulation of surrounding rock damage can reflect the stress and strain distribution of surrounding rock more accurately, and it is verified that the engineering support system has sufficient safety. The simulation results after damage effect are more in line with the on-site monitoring values, the dome settlement and the peripheral convergence error are reduced by 12.1% and 32.8% respectively, and the error of numerical simulation is obviously reduced.The method of mutual monitoring by monitoring and numerical simulation can be more accurate Analyze the stability of the tunnel structure and better guide the construction so as to provide a theoretical basis for the design and construction of the Ma Liya Tunnel and similar geological tunnels.