顶管摩擦力对土体竖向位移影响的动态模拟

Dynamic Simulation of Influence of Pipe-jacking Friction Force on Vertical Displacement of Soil

研究了顶管顶进过程中摩擦力对土体竖向位移的影响,利用Marc有限元软件对顶管的顶进过程进行了三维动态模拟,阐述了模拟过程中参数的选择及模拟的主要过程。结果表明,摩擦力的增大会使横向及纵向表层土体的竖向位移均增大,同时随顶进距离的增加,横向表层土体位移的增幅越来越小,而纵向土体位移则表现为距离顶管前端距离越小的地表土体位移增速越快,且摩擦力对横向土体的影响范围大于对纵向土体的影响范围。

This paper discusses the influence of friction force on soil vertical displacement during the pipe-jacking process. Three-dimensional dynamic jacking process is simulated by finite element software Marc. Parameters selection and main process in simulation is presented. The result shows that the increased friction force can raise both horizontal and vertical displacement of soil; with the increase of jacking distance, the amplitude increasing of transverse surface soil displacement will become srnall~ while the smaller distance it is from head of pipe-jacking, the faster increasing of vertical soil displacement; furthermore, the influence range of friction force on the horizontal soil is larger than that of longitudinal soil.