堆载作用下单桩承载力特性研究

Study on the Bearing Capacity of Single Pile under Surcharge Loads

采用ABAQUS有限元软件二维平面应变单元有限元法对单桩受桩周土体固结而产生的负摩阻力进行分析,讨论土体固结、桩土摩擦系数以及持力层弹性模量对桩的负摩阻力影响。分析表明,桩身所受的摩擦力,随着桩周土体的固结沉降而逐渐增大,负摩擦范围随之增大,中性点下降;桩土间摩擦系数越大,桩身所受的负摩擦力越大;此外,当持力层土体模量增加时,中性点上升,桩身下拉力增加。

This paper presents the interaction pattern of pile and ground to influences of soil consolidation,pile and soil friction coefficients and bearing stratum soil modulus in ABAQUS. The result shows that with the increasing of soil consolidation the negative friction increases gradually and neutral point declines. The higher friction coefficient is, the larger negative skin friction becomes. In addition,the larger bearing stratum soil module is,the higher position of neutral point is, and the bigger pile axial tensile force is.