非偏压与偏压条件下浅埋隧道围岩压力的极限分析

发布时间：2018-03-26 17:51

本文选题：隧道工程　切入点：破坏模式　出处：《公路交通科技》2014年05期

【摘要】：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。
[Abstract]:Considering the non-bias voltage and bias voltage, according to the failure mode adopted by the Taishaji method, the failure mode adopted in the Highway Tunnel Design Code and the actual engineering experience, a new kind of shallow buried tunnel is constructed, which is closer to the actual situation. Using the upper limit method of limit analysis, the theoretical formula of surrounding rock pressure of shallow tunnel under this new failure mode is deduced, and the theoretical formula is transformed into a calculation model to solve the problem of maximum surrounding rock pressure. Combined with an example, using Matlab software, the sequential quadratic programming algorithm is used to optimize the solution of the calculation model. The optimized solution is compared with the existing research results and the results obtained from the calculation based on the limit equilibrium method. The results show that: for the shallow tunnel, The results obtained by using the upper limit method of limit analysis based on this new failure mode are basically consistent with the existing research results and the results obtained from the calculation based on the limit equilibrium method, which not only shows that the upper limit method of limit analysis is used to study the problem. Feasibility of surrounding rock pressure of shallow tunnel, It also verifies the rationality of the new failure mode of shallow buried unbiased tunnel and shallow buried bias tunnel.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金项目(51378510,51178468) 湖南省研究生科研创新项目(CX2013B077)
【分类号】：U451.2

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