浸水条件下湿陷性黄土地基群桩基础承载特性研究

STUDY ON BEARING CHARACTERISTICS OF GROUP PILE FOUNDATION OF WET-SUBMERGED LOESS FOUNDATION UNDER SUBMERGED WATER CONDITIONS

通过模拟试验的方式,对群桩基础承载特性展开了分析,通过研究发现:在浸水条件下,随着浸水时间的不断提升,湿陷变形初期较为平缓,然后迅速下降,之后再次回归平缓。且实现深度提升后,桩基所产生的负摩阻力由上至下不断增长,中性点深度所处位置不断降低。浸水被处理后,中性点深度比为0.7。湿陷变形迅猛下降阶段,桩基所产生的负摩阻力将迅猛提升,下拉荷载增加,桩端荷载提高,由此表明:土层湿陷、桩基所产生的负摩阻力及群桩基础沉降呈现出相同的发展趋势。

In this paper,through the simulation test,the bearing characteristics of pile group foundation are analyzed.It is found that:under the condition of immersion,with the continuous increase of immersion time,the collapsible deformation is relatively gentle at the initial stage,then drops rapidly,and then returns to gentle again.After the depth is increased,the negative friction generated by the pile foundation increases from top to bottom,and the position of the neutral point depth decreases.After immersion treatment,the neutral point depth ratio is 0.7.At the stage of rapid decline of collapsible deformation,the negative friction generated by pile foundation will increase rapidly,the pull-down load will increase,and the pile end load will increase.This shows that the soil collapsible,the negative friction generated by pile foundation and the settlement of pile group foundation show the same development trend.