用生灰砂桩挤密法处理高含水黄土地基的研究与实践

Research and Practice on Disposing Loess Foundation of High Water-content by Using Compacted Lime-sand Pile

根据工程实例研究了用生灰砂桩法处理高含水黄土地基的方法 ,发现该方法既能有效挤密桩间土 ,提高密实度 ,消除湿陷性 ,又能有效降低土体含水率 ,改变土体的状态。同时生灰砂桩胀化过程中与砂形成坚硬固化物 ,具有较高强度 ,且随龄期的增长而提高 ,使其与桩间土形成复合地基 ,大大提高地基承载力 ,是一种处理高含水黄土地基简便有效的方法 。

In this paper, the method of disposing loess foundation of high water-content by using lime-sand pile is researched according to case study. It is found that the method can not only compact interpile soil effectively, improve its compactness and eliminate its collapsibility, but also decrease water-content of soil mass effectively and change the state of soil mass. Meanwhile, lime-sand pile can form firm solified substance with sand in the process of expansion. The substance has higher strength which can promote with the increase of age, and makes the pile form compound foundation with interpile soil to improve bearing capacity of foundation greatly. This is a simple and effective method of disposing loess foundation of high water-content with the value of promotion and application.