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考虑非偏压和偏压2种情况,根据泰沙基法采用的破坏模式、《公路隧道设计规范》采用的破坏模式以及实际的工程经验,针对浅埋隧道构建了一种更接近于实际情况、更加合理的、新的破坏模式;采用极限分析上限法推导出这种新破坏模式下浅埋隧道围岩压力的理论公式,并把理论公式转化成一个求围岩压力最大值问题的计算模型;结合算例,利用Matlab软件,采用序列二次规划算法对计算模型进行优化求解,并把优化解与已有的研究成果及基于极限平衡法计算得到的结果进行对比分析。研究结果表明:针对浅埋隧道,基于这种新的破坏模式采用极限分析上限法所得到的结果与已有的研究成果及基于极限平衡法计算得到的结果基本一致。不仅说明了运用极限分析上限法来研究浅埋隧道围岩压力的可行性,也验证了浅埋非偏压隧道和浅埋偏压隧道新破坏模式的合理性。
Considering the two cases of non-bias and bias voltage, according to the failure mode adopted by the Tatsha-based method, the failure mode adopted in the “Code for Design of Highway Tunnels” and the practical engineering experience, a method is proposed for shallow tunnels that is closer to the actual situation , A more reasonable and new failure mode. The upper bound method is used to deduce the theoretical formula of the surrounding rock pressure of shallow tunnel under this new failure mode, and the theoretical formula is transformed into a calculation model for calculating the maximum pressure of surrounding rock ; Combined with examples, using Matlab software, using sequence quadratic programming algorithm to optimize the calculation model, and the optimal solution and the existing research results and based on the limit equilibrium method to calculate the results of comparative analysis. The results show that the results obtained by the upper limit analysis method based on this new failure mode are basically the same as the existing research results and the results based on the limit equilibrium method for shallow tunnels. It not only shows the feasibility of using limit analysis upper bound method to study the pressure of surrounding rock in shallow tunnels, but also verifies the rationality of new failure modes of shallow unburied tunnel and shallow buried tunnel.