深厚软土明挖隧道基底标高变异及其控制措施研究  

Research on and Control Measures for Base Elevation Variations of Open-Cut Tunnels in Deep Soft Soil

作　　者：宁茂权[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《现代隧道技术》2015年第3期31-38,共8页Modern Tunnelling Technology

摘　　要：深厚软土地层明挖隧道开挖基底隆起和回筑加载后隧道沉降一直是工程界关注的重点问题。文章以温州市域铁路隧道工程为例,对深厚软土地层明挖隧道基底开挖隆起和回筑回填加载后的沉降问题进行了研究。基于分层总和法,采用回弹模量法和复合模量法分别研究了基坑开挖卸载后的基底隆起值和复合地基隧道回筑填土加载后的沉降值,并对不同工况下的基底隆起值和隧道沉降值进行了对比分析。结果表明,深厚软土地层采用复合地基处理后,明挖隧道基底隆起和运营期隧道沉降是可控的,复合地基处理可以达到减少竖向变形、增大地基强度的目的。结合该工程特点,采取了合适的隧道沉降控制措施,可为类似明挖隧道工程施工提供参考。Base heaving and tunnel settlement due to the excavation and backfilling of open-cut tunnels in deep soft soil have always been of great concern. Using the Wenzhou intercity railway tunnel as an example, this paper studies the issues of base heaving and settlement induced by the excavation and backfilling of open-cut tunnels in deep soft soil. Based on the layer-wise summation method, the value of base heaving after unloading due to foundation pit excavation and the settlement value of a tunnel with a composite foundation after backfilling are studied using the rebound modulus method and the composite modulus method. A comparison analysis of base heaving values and tunnel settlement values under different construction conditions is conducted. The study results show that base heaving of the open-cut tunnel and the settlement of the operated tunnel are controllable,and the vertical deformation decreases and the ground strength improves after applying a composite foundation in deep soft soil. Appropriate control measures against tunnel settlement are adopted considering certain engineering characteristics.

关 键 词：深厚软土 明挖隧道 基底隆起 隧道沉降 分层总和法 复合模量法 控制措施 

分 类 号：U451[建筑科学—桥梁与隧道工程]