顶管工程后背受力与变形三维分析

以某顶管工程为背景,采用朗肯被动土压力理论对后背土体的承载能力进行了分析;根据弹塑性模型建立起后背结构的三维有限元模型,对后背结构与土体在顶力作用下的变形与受力过程进行分析,并同朗肯理论结果进行比较;对影响后背结构的变形各因素进行了分析;对后背结构顶力合力点的变形进行了实测,并同理论预测结果进行了对比分析,初步探讨了形成差异的主要原因。

Stress and deformation analysis of pipejacking thrust wall

The bearing capacity of the soil behind the thrust wall is analyzed with Rankine theory for lateral passive earth pressure in a pipe jaking project.The stress and deformation produced by the jacking force are researched by a three-dimension elastoplastic FEM model for the thrust wall and soil.The results are compared with the Rankine theory.The factors,the elastic modulus and the height of the thrust wall,the elastic modulus of soil and the wall-soil interface friction coefficient,which effect the deformation and the stress,are analyzed. The deformation of point for the composition of jacking forces is measured in situ and compared it with the result of FEM.The main reasons for the difference are discussed.