大直径钉形搅拌桩加固软基失稳事故分析

Research on Collapse Accident in Soft Foundation Reinforcement with Large Diameter T-shaped Deep Mixing Column

大直径钉形搅拌桩复合地基处理新技术,在应用中取得了良好的效果,同时也引起一些意想不到的事故。结合某公路大直径钉形搅拌桩复合地基失稳事故,从扩大头高度、扩大头直径、桩径比、桩间距等主要影响因素方面,对复合地基承载力的影响规律进行了分析,得出桩间距为复合地基承载力的最大影响因素,同时对扩大头高度、扩大头直径、桩径比的合适范围进行了分析,对新技术的推广应用具有重要的借鉴意义。

The new technology of composite foundation treatment with large diameter T-shaped deep mixing column achieves good results in application, but also causes some unexpected accidents. This paper, based on a highway of large diameter T-shaped deep mixing column composite foundation instability accident, analyzes the impact of the enlarged pile length, the enlarged pile diameter, the pile diameter ratio and the distance between the piles on the bearing capacity of composite foundation. At the same time the appropriate range of the enlarged pile length, the enlarged diameter and the pile diameter ratio is analyzed, which can provide reference for the application and popularization of the new technology.