地铁隧道开挖引起的管线变形计算与试验研究  

Deformation calculation and experimental study on buried pipes induced by subway tunnel excavation

作　　者：程霖[1,2] 杨成永 马文辉[1] 车敬珂[3] CHENG Lin;YANG Chengyong;MA Wenhui;CHE Jingke(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;China Construction 2nd Engineering Bureau Ltd.,Beijing 100160,China;Beijing General Municipal Engineering Design&Research Institute Co.Ltd.,Beijing 100082,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国建筑第二工程局有限公司,北京100160 [3]北京市市政工程设计研究总院有限公司,北京100082

出　　处：《华中科技大学学报（自然科学版）》2022年第4期7-13,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51278044,51478032);中国建筑第二工程局有限公司科技资助计划资助项目(2020ZX140001).

摘　　要：为得到管线附加变形的理论计算方法,建立了考虑管土脱空的双层弹簧弹性地基梁模型.基于所建模型分别推导了管土接触区与脱空区的荷载表达式,给出了管线变形控制微分方程的传递矩阵法求解步骤,利用有限元数值解验证了理论解的正确性.计算了管土相对刚度系数R与管线归一化弯矩和沉降的关系.开展离心模型试验对管土脱空行为进行观测,将试验数据与理论计算结果进行了对比分析.结果表明:本文方法计算得到的管线沉降和弯矩比当不考虑管土脱空时较小;R=1×10^(-4)可作为判断管土能否产生脱空的界限;在离心模型试验中,管线与下部土层相互作用力试验结果证实了管土脱空的存在,表明在管线变形计算中考虑管土脱空是有必要的.To obtain the theoretical method for calculating the additional deformation of pipeline,an elastic foundation beam model with double-layer springs considering the pipe-soil detachment was established.Based on the proposed model,the load functions of the pipe-soil contact area and the pipe-soil detached area were deduced,respectively.The procedure of transfer matrix method for solving the governing differential equation of pipeline deformation was given.The correctness of the theoretical solution was verified by finite element numerical solution.The relationships between the pipe-soil relative stiffness coefficient R and the normalized bending moment and settlement of the pipeline were calculated.Centrifugal model tests were carried out to observe the pipe-soil detachment behavior.The experimental data was compared with the theoretical calculation results.Results show that the settlement and bending moment of the pipeline calculated by the proposed method are less than that calculated without considering the pipe-soil detachment.R=1×10^(-4) can be used as a threshold to judge whether or not detachment between pipeline and soil happens.The centrifugal model test results of the interaction force between pipeline and the underlying soil show that the detachment between pipeline and soil does exist,indicating the necessity of considering the pipe-soil detachment in calculation of pipeline deformation.

关 键 词：地铁隧道 地下管线 脱空 弹性地基梁 传递矩阵法 离心模型试验 

分 类 号：U455[建筑科学—桥梁与隧道工程]