砂土隧道施工对下卧管线影响的试验和数值模拟分析  

Physical model tests and PFC^(3D) modeling of soil-pipe interaction in sands during tunnelling

作　　者：王正兴[1] 缪林昌[1] 王冉冉[1] 王非[1] 王小龙 

机构地区：[1]东南大学,江苏南京210096 [2]江苏省电力设计院,江苏南京210014

出　　处：《岩土工程学报》2014年第1期182-188,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51278099)

摘　　要：对砂土中隧道施工引起管线性状变化进行了室内模型试验,分析了管土相互作用的一些宏观特性,为进一步进行三维颗粒流细观模拟提供必要的参数和宏观依据。在室内模型试验的基础上,建立了隧道垂直下穿既有管线颗粒流分析模型,验证了室内模型试验的宏观现象。在此基础上分析了隧道施工过程中管土相互作用的机理、管周土体的应力与位移以及管线的剪应变和弯矩。分析结果可为工程实践中确定管线加固位置提供理论依据。A series of lg physical model tests are carried out to investigate the tunnelling effects on existing pipelines. A tunnel is excavated directly underneath the existing pipeline. The tunneling-induced pipeline deformation mechanism and the stress field around the pipeline are studied. In addition, three-dimensional discrete element back-analyses （PFC3D） are conducted to improve the understanding of soil-pipe interaction problem. Based on the measured and computed results, change of the tunneling-induced stress, displacement, shear strain and bending moment in the existing pipeline are analyzed. The findings in this study can give theoretical basis for the reinforcement design of pipelines.

关 键 词：模型试验 颗粒流 隧道施工 管土相互作用 砂土 位移 

分 类 号：TU470[建筑科学—结构工程]