粘性土中打桩引起的应力场及其对土体强度的影响

Stress field and its effect on soil strength caused by pile installation in clay ground

根据土塑性力学的基本原理 ,用土体内空穴球形扩张模型模拟打桩 ,并用源 -源的影像手段推得了沉桩时在土体内产生的应力场、孔隙水压力场和打桩前后土体强度变化的解析解。文章用计算结果与工程实例进行对比 ,二者比较接近 ,说明该计算方法具有实用价值。通过对两种土体、不同桩长变化的显著性分析 。

Based on the theory of soil plastic mechanics, by means of cavity expansion and imaging method, an analytic solution on the stress field, pore pressure field and the variation of soil strength caused by the pile installation in clay ground has been presented in this paper. The calculated results are approached to those of the observation in site. Furthermore, the various regularity of the soil strength due to the variation of soil property and pile length after pile installation is also proposed.