静压桩挤土效应数值模拟分析

静压桩由于是预制桩,桩身质量可靠,价格相对较低,同时又具有无噪音、无振动、无冲击力、施工应力小等优点而得到了广泛的应用,但静压桩属于排土置换桩,在沉桩贯入过程中产生的挤土效应对周边环境造成了不利影响。本文根据静压桩的实际情况,采用位移贯入法和Mohr-Coulomb屈服准则,考虑了土体的剪胀性质、土体的大变形、桩土界面摩擦系数、土体初始应力场影响的情况下,建立了符合工程实际的二维轴对称有限元模型,详细地模拟了静压单桩施工过程,得出了静压桩在沉桩过程中的位移场和沉桩完成时的位移场和应力场。

Numerical Simulation of Static Pile Soil Compaction Effect

Jacked pile is widely used because of its various advantages, such as noiseless, wutauu , v,,~, and minor construction stress. But as a type of soil compaction piling, jacked pile often causes negative effects on adjacent buildings. Based on the actual situation of jacked pile, using the displacement penetration method and Mohr-Coulomb yield criterion, taking into account the influence of dilatancy of soil properties, large deformation of soil, pile-soil interface friction coefficient, the initial stress field of soil, author established a two-dimensional axisymmetric finite clement model which accords with actual process of jacked pile. Finally, during and after single pile construction, the displacement field and stress field of soil around pile are obtained.