短期集中荷载作用下伏既有浅埋盾构隧道力学行为分析  

Mechanical behavior analysis of existing shallow buried shield tunnel under short-term concentrated load

作　　者：雷金山[1,2] 代忠 杨秀竹[1] 陈菲 LEI Jinshan;DAI Zhong;YANG Xiuzhu;CHEN Fei(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High-speed Railway Construction,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2019年第1期137-143,共7页Journal of Railway Science and Engineering

基　　金：湖南省自然科学基金资助项目(2017JJ2316)

摘　　要：某新建立交桥跨越地铁盾构隧道,受跨度影响需架设临时支墩。由于下伏盾构隧道埋深较浅,桥墩的设置及其所施加的荷载将导致赋存于土层中的盾构隧道结构产生附加应力和变形。通过数值模拟分析临时钢便桥支墩集中荷载对隧道结构的内力及位移所产生的影响,以进一步指导施工,规避风险。研究结果表明:所得集中荷载作用下盾构隧道拱顶最大沉降变形与径向收敛变形、隧道衬砌所受内力均未超过控制标准。For a newly built overpass spans a subway shield tunnel,the temporary piers should be erected under the influence of span.Because the buried depth of the buried shield tunnel is shallow,the installation of the pier and the applied load will cause additional stress and deformation in the shield tunnel structure.In this paper,numerical simulation analysis of the temporary steel bridge pier impact force and displacement of the concentrated load on tunnel structure was generated to further guide the construction and avoid the risk.Under the optimized concentrated load,the maximum settlement deformation and radial convergence deformation of the vault of the shield tunnel and the internal force of the tunnel lining are all no more than the control standards.

关 键 词：集中荷载 浅埋隧道 数值计算 影响分析 

分 类 号：U455[建筑科学—桥梁与隧道工程]