浅埋偏压大断面隧道施工优化及受力特征分析

发布时间：2018-04-13 23:37

本文选题：隧道工程 + 偏压浅埋洞口　；参考：《地下空间与工程学报》2017年02期

【摘要】：大断面浅埋偏压隧道洞口段施工困难,风险高;且受洞口复杂地质条件和施工空间效应影响,隧道支护结构变形和受力特性复杂,施工控制难度高。针对在建的宝兰客专小墁坪隧道出口浅埋偏压段的施工稳定性问题,采用数值模拟试验分析方法,研究了三台阶+临时横撑施工中不同上、中、下台阶错开距离时隧道的施工动态特性,分析了不同错开距离时隧道支护结构的变形和受力特点;基于数值模拟试验确定了大断面偏压隧道洞口段的施工方案,跟踪隧道施工进行的变形监测验证了推荐的三台阶+临时横撑施工中上台阶与中台阶错开5 m,中台阶与下台阶错开10~15 m(即1倍洞径)距离的施工参数经济、合理、可行,保证了隧道施工的安全,也为同类隧道工程的建设提供有益的借鉴和指导。
[Abstract]:It is difficult to construct the section of large section shallow buried eccentric pressure tunnel with high risk, and it is very difficult to control the construction because of the complex geological conditions and space effect of the tunnel support structure and the complex mechanical characteristics of the tunnel support structure.In view of the construction stability of the shallow buried bias section at the exit of Baolanke Xiaoping Tunnel under construction, the numerical simulation test analysis method is used to study the different upper and middle levels in the construction of three steps temporary transverse brace.The dynamic characteristics of tunnel construction under staggered lower steps are analyzed, and the deformation and stress characteristics of tunnel support structure with different staggered distances are analyzed, and the construction scheme of tunnel opening section with large cross-section bias pressure is determined based on numerical simulation test.The deformation monitoring of track tunnel construction verifies that the recommended construction parameters are 5 m staggered between upper and middle steps and 1015 m (i.e. 1 times hole diameter) distance between middle and middle steps in temporary transverse bracing construction with three steps, which is reasonable and feasible.It ensures the safety of tunnel construction and provides useful reference and guidance for the construction of similar tunnel projects.
【作者单位】：西安建筑科技大学土木工程学院;中国铁建大桥工程局集团有限公司;
【基金】：国家基金面上项目(51578447) 渭南市科研发展计划项目(2015KYJ3-1)
【分类号】：U455.4

【相似文献】