碎石土强夯加固效果荷载试验分析

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. 

Plate Load Test Investigation of Dynamic Compaction Effect of Gravel Soil

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 bearing 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.