马鞍子梁软岩隧道围岩变形规律及支护技术模拟分析.pdf

2012年1月上 施工技术 第41卷第356期 CONSTRUCTIONTECHNOLOGY 87 马鞍子梁软岩隧道围岩变形规律及 支护技术模拟分析 任建喜，党超 （西安科技大学建筑与土木工程学院，陕西西安710054） [摘要】结合马鞍子梁隧道工程，采用FLAC数值模拟方法对该隧道上下台阶法施工全过程进行模拟分析，完成了 现场监测研究，与数值模拟预测的结果进行了比较，得到了软岩隧道的围岩变形规律，提出合理的支护方案。

结果 表明，该开挖方法适用于此软岩隧道，竖向位移主要集中在拱顶和拱底处，拱顶位移比较大，水平位移主要集中在 隧道两肩和两脚处。

现场监测表明：隧道开挖初期拱顶下沉与水平收敛变形速率比较大，处于不稳定状态，随时间 变形速率较小，曲线趋于稳定状态。

FLAC数值模拟预测结果与实测结果基本一致，一次支护和二次衬砌的合理间 隔时间为30d。

[关键词】隧道工程；软岩隧道；上下台阶法；数值模拟；围岩；变形；支护；监测 [中图分类号]U456.3 [文献标识码]A [文章编号］1002-8498(2012)01-0087-05 Deformation Rule and Simulation Analysis of Supporting Technology on Soft Rock Tunnel in Maanziliang Tunnel Ren Jianxi，Dang Chao (SchoolofArchitecture andCivilEngineering，Xi’anUniversity ofScience andTechnology，Xian，Shaanxi710054,China） Abstract:Combined with Maanziliang tunnel engineering,using FLAC numerical simulation method to analyze the whole process of benching tunneling method， the study on actual monitoring is pleted. Compared with the numerical simulation results, authors get the soft rock tunnel surrounding rock deformation，and suggest the reasonable supporting scheme. The results show that the excavation method is applied for the soft rock tunnel. Vertical displacement is mainly concentrated on the top and bottom of the dome and the dome displacement is relatively large.Horizontal displacement is mainly concentrated on the shoulder and foot. The actual monitoring shows that the tunnel vault settlement and horizontal state,over time the deformation rate is small and the curve tends to be stable. The FLAC numerical simulation results are basically the same as the measured results. The Reasonable interval between the first support and the second support is 30 days. Key words:tunnels; soft rock tunnels;benching tunneling method; simulation; surrounding rock; deformation;supporting;monitoring 隧道施工理论计算与现场监测成为隧道施工监测，对隧道上下台阶法施工过程进行模拟，通过 安全性保障的有利证明，通过现场对围岩与支护形与现场监测数据对比，得出上下台阶法施工对此隧 式监测，为下一步初期支护和二次支护参数调整提道目标断面开挖比较合理的结论。

供依据，把理论计算与现场监测进行对比整理，可1工程概况 以进一步优化支护方案和施工方案。

本文以马鞍马鞍子梁隧道位于桃园隧道的西北方向约8km 子...