作　　者： (陈红军）; (刘新荣）; (王成）; (宿钟鸣）;

机构地区： 重庆大学土木工程学院,重庆400045 山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处： 《现代隧道技术》 2017年第4期68-76,共9页

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。 Based on the Yajiang tunnel on the Nanchuan-Fuling expressway in Chongqing, a model test for the fail- ure process of a tunnel buried in an inclined soft/hard interbed stratum was performed. The results indicate the tun- nel＇s failure begins from the soft stratum around the left sidewall. The failure process can be divided into five stages according to the failure characteristics, and the surrounding rock＇s failure leads to the unloading effect of the sur- rounding rock stress. A numerical model of the Yajiang tunnel was also established by finite element software, and the numerical calculation results show that the extreme value of the surrounding rock＇s maximum principal stress al- ways occurs at the left haunch, which is different from where failure first happens. According to the stress distribu- tion along the vault route, the third principal stress is the highest one. The surrounding rock stress varies in a shock- ing way as a result of different stratum properties caused by the soft/hard interbed stratum. At the first stage of the failure process, the scope of the pressure arch is about 1.35 times the tunnel＇s excavated span.

关 键 词： 倾斜软硬互层 隧道 破坏过程 围岩应力 压力拱