地应力释放率对盾构隧道管片内力影响的模拟分析  

Simulation analysis of influences of ground stress release rate on internal force of shield tunnel segments

作　　者：李守巨[1] 李浩[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116204

出　　处：《工程建设》2015年第5期1-5,共5页Engineering Construction

基　　金：国家重点基础研究发展计划资助项目(2015CB057804);国家自然科学基金资助项目(51105048;51209028);工业装备结构分析国家重点实验室开放基金资助项目(S14206)

摘　　要：考虑盾构隧道施工中产生的地应力释放,采用有限元法模拟了不同地质条件下的盾构隧道管片的内力分布。将有限元模拟的盾构隧道施工引起的地表沉降值与现场观测值的对比,确定了某地铁隧道施工引起的地应力释放率。有限元模拟分析结果表明,地表的最大沉降近似与地应力释放率成正比,并建立了两者之间的映射关系。研究表明,与不考虑地应力释放率相对比,实际的管片最大弯矩、最大轴力和最大剪力分别下降了48%,62%和49%。考虑盾构施工引起地应力释放所得到的管片内力会更加接近实际的情况。In consideration of release of the ground stress in shield tunnel con- struction, the internal force distribution of shield tunnel segments under different geo- logical condition was simulated by using finite element method. By comparing the ground settlement value caused by shield tunnel construction of finite element simula- tion with the site observation value, the release rate of the ground stress caused by a subway tunnel construction was determined. The finite element simulation analysis re-suit indicates that, the actual maximum settlement is approximately proportional to ground stress release rate, and the mapping relationships between them are established. The study shows that, by comparing without considering ground stress release rate, the maximum bending moment, axial force andshear force of tunnel segments decrease by about 48% ,62% and 49% respectively. The internal force of segments is more close to actual condition with consideration of the ground stress caused by shield tunnel construction.

关 键 词：盾构法 有限元模型 地表沉降 地应力释放率 内力分布 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]