倾斜软硬互层隧道破坏过程的围岩应力研究

发布时间：2018-04-30 16:17

本文选题：倾斜软硬互层 + 隧道　；参考：《现代隧道技术》2017年04期

【摘要】：文章结合重庆南涪高速公路鸭江隧道工程,进行了倾斜软硬互层隧道破坏过程的模型试验。试验结果表明,隧道的破坏从左侧边墙周围的软弱岩层开始。根据破坏特征可以将隧道破坏过程分为五个阶段,且隧道围岩的破坏会导致围岩应力的卸荷效应。采用有限元软件建立数值模型分析隧道破坏过程,数值计算结果表明:围岩的最大主应力极值始终位于隧道左侧拱腰处,与隧道最先破坏的位置不一致。从拱顶路径的应力分布分析,围岩的第三主应力为最大主应力。由于软硬岩层的岩性不同,围岩应力沿应力路径表现出震荡式变化。在隧道破坏的第一阶段,压力拱范围约为隧道开挖跨度的1.35倍。研究结果对类似隧道工程具有重要的参考价值。
[Abstract]:Combined with the Yagang Tunnel of Nanfu Expressway in Chongqing, the model test of the failure process of inclined soft and hard interlayer tunnel is carried out in this paper. The test results show that the tunnel failure begins with the soft rock layer around the left side wall. According to the failure characteristics, the tunnel failure process can be divided into five stages, and the tunnel surrounding rock failure will lead to the unloading effect of surrounding rock stress. The finite element software is used to establish a numerical model to analyze the tunnel failure process. The numerical results show that the maximum principal stress extremum of surrounding rock is always located at the left arch of the tunnel, which is inconsistent with the first failure position of the tunnel. According to the stress distribution of the arch path, the third principal stress of surrounding rock is the maximum principal stress. Because of the different lithology of soft and hard strata, the stress of surrounding rock shows oscillatory variation along the stress path. In the first stage of tunnel failure, the range of pressure arch is about 1.35 times of tunnel excavation span. The results have important reference value for similar tunnel engineering.
【作者单位】：重庆大学土木工程学院;山地城镇建设与新技术教育部重点实验室;重庆交通大学土木建筑学院;山西省交通科学研究院;
【基金】：黄土地区公路建设与养护技术交通行业重点实验室开放课题(KLTLR-Y13-2)
【分类号】：U451.2

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