碎石土强夯加固效果荷载试验分析

摘要

In order to deeply probe into influences of gravel content and distribution on bearing capacity and differential settlement,18 plate loading tests were carried out on 3 dynamic compaction foundations with different gravel contents.The research result shows that the dynamic compaction foundation of gravel soil has a better bearing capacity with a mean of above 250 kPa.The non-uniform bearing capacity and differential settlement of foundation are more obvious with the increase of gravel content and uneven distribution.For dynamic compaction foundation with a high gravel content and uneven distribution,great differential settlement occurs when load is close to or reaches at its beating capacity.The differential settlement can be as large as 3 to 4 times because of the difference of grave content of a dynamic compaction foundation in Kai County in Chongqing.%为探讨碎石含量及其分布对强夯地基承载力和差异沉降的影响规律,采用平板荷载试验,对3种不同碎石含量强夯地基的加固效果进行了检测.结果表明:碎石土强夯地基具有较好的承载力,平均承载力均超过250 kPa；随碎石含量增加和分布不均匀性增强,地基承载力的不均匀性增强,差异沉降增大；对于碎石含量较高且分布不均的强夯地基,当荷载接近或达到地基承载力以后,将出现更大的差异沉降；对于重庆市开县某强夯地基,不同碎石含量可导致强夯地基的差异沉降量相差3～4倍.