中国铁道科学2013，Vol.34Issue(3)：40-46,7.DOI:10.3969/j.issn.1001-4632.2013.03.07
铁路盾构隧道单、双层衬砌纵向力学性能的模型试验研究
Model Test on Longitudinal Mechanical Properties of Single and Double Layered Linings for Railway Shield Tunnel
摘要
Abstract
Taking Shiziyang underwater shield tunnel of Guangzhou-Shenzhen-Hongkong passenger dedicated line as engineering background,model tests on the longitudinal mechanical properties of single and double layered linings were conducted using equivalent axial stiffness model.Combined with numerical calculations,the variations of longitudinal settlement and bending moment of shield tunnels with single and double layered linings under the junction of hard and soft strata in the conditions that the surface upon the tunnel is partially loaded were studied.Results show that the longitudinal settlement of single-layered lining is significantly influenced by the change of strata when the tunnel is located at the junction of hard and soft strata.Both larger settlement and differential settlement occur on the side of soft strata.Double-lay-ered lining can resist uneven settlement caused by the change of strata to some extent.Both the maximum settlement and differential settlement at the longitudinal center of tunnel are smaller.After concrete lining is continuously applied to the inner side of segment lining,the longitudinal bending moment of tunnel is doubled,and the maximum positive bending moment occurs slightly at the soft strata side of the tunnel center.Most bending moment is borne by concrete lining.When the load is located within three times of tunnel diameter from tunnel axis,the longitudinal deformation and internal force of tunnel will be affected.关键词
盾构隧道/管片/单层衬砌/双层衬砌/纵向力学性能/模型试验Key words
Shield tunnel/ Segment/ Single-layered lining/ Double-layered lining/ Longitudinal mechanical property/ Model test分类
交通工程引用本文复制引用
何川,郭瑞,肖明清,周济民,何应道..铁路盾构隧道单、双层衬砌纵向力学性能的模型试验研究[J].中国铁道科学,2013,34(3):40-46,7.基金项目
国家"九七三"计划项目(2010CB732105) （2010CB732105）
国家杰出青年科学基金资助项目(50925830) （50925830）
高铁联合基金资助重点项目(U1134208) （U1134208）
