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.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
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)
关键词
模型试验
颗粒流
隧道施工
管土相互作用
砂土
位移
physical model test
PFc3D
tunnelling
soil-pipe interaction
sand
displacement
