灰土挤密桩与CFG桩分步处理高层建筑湿陷性黄土地基的应用研究

本文以一建在湿陷性黄土场地的高层建筑地基处理为实例,针对处理过程中先采用灰土挤密桩消除黄土湿陷性再利用CFG桩提高地基承载力的方法和效果进行了跟踪测试。地基处理前后地基土的物理力学试验指标、静力触探试验曲线和静力载荷试验结果的对比表明,灰土挤密桩能有效地消除黄土的湿陷性,CFG桩使复合地基的承载力得到了显著提高,能够满足高层建筑对地基承载力的要求。同时,该处理方法具有工艺简便、造价低等优点,应广泛在湿陷性黄土地区的高层建筑地基处理中推广。

The Applied Research of Step Processing Tall Building Foundation in Collapsible Loess Area by Lime Soil Pile and CFG Pile

In this paper,as an example of the foundation treatment of a tall building in collapsible loess site,we do some tracking test about the methods and the effects that we first using lime soil pile to eliminate the collapse of loess and then improve the bearing capacity of the foundation by CFG pile.The comparison of the physical and mechanical test indicators,cone penetration test curve and the static load test results before and after the foundation treatment showed that lime soil pile can eliminate loess collapsibility,the bearing capacity of composite foundation has also been increased significantly by CFG pile to meet the requirements of the tall buildings.Meanwhile,this method is simple and low cost,should be widely promoting for the foundation treatment of tall buildings in loess region.