基于模型试验的盾构隧道纵向刚度分析  

Longitudinal rigidity of shield tunnels based on model tests

作　　者：叶飞[1] 杨鹏博[1] 毛家骅 毛燕飞[1] 陈治[1] 孙昌海[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《岩土工程学报》2015年第1期83-90,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51178052;50808020;51478044)

摘　　要：为探明盾构隧道纵向变形性能及抗弯刚度有效率的取值,基于模型试验,根据相似理论对通缝、错缝及匀质圆筒模型进行纵向模型试验研究。分别对3种纵向试验模型进行了加载试验,采用数据采集系统测试加载过程中的管片模型的纵向变形,得到了各级荷载下通缝、错缝及匀质圆筒模型纵向变形规律及其抗弯刚度有效率,并对试验结果进行对比分析。结果表明:1盾构隧道纵向变形与荷载基本呈线性关系;2通缝、错缝隧道纵向抗弯刚度有效率分别在0.18~0.39和0.20~0.40;3通缝和错缝隧道的纵向弯曲变形性能基本一致,错缝拼装效应对盾构隧道纵向变形的影响并不明显,研究成果可为盾构隧道的设计提供参考。In order to explore the performances of longitudinal deformation and the efficienct values of bending rigidity of shield tunnels, straight-jointed,stagger-jointed and uniform longitudinal models are investigated based on model tests and similarity theories. The values of longitudinal deformation of three kinds of longitudinal models under loads are measured by a data acquisition system. The rules of longitudinal deformation and the efficiencies of bending rigidity of the straight-jointed stagger-jointed, and uniform longitudinal models under all loading stages are obtained, by adding the concentrated loads on the models. The comparative analysis of the test results shows the linear relationship between the longitudinal deformation and the loads. The range of the efficienct values of longitudinal bending rigidity is between 0.18 and 0.39 under straight-jointed condition, and in the stagger-jointed model it is between 0.20 and 0.40. What's more, the performances of the longitudinal bending of straight-jointed and stagger-jointed tunnels are similar, and the stagger-jointed effect is not obvious to the longitudinal deformation of shield tunnels. This study may provide some references for the design of shield tunneling in China.

关 键 词：盾构隧道 管片结构 模型试验 纵向刚度 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]