淤泥质粘土层地基的强夯试验研究

Experimental Study on Dynamic Compaction to Improve Saturated Soft Clay

根据某港区工程陆域不同区域的工程地质条件 ,进行了不同的强夯试验 ,对夯坑周围地表变形、土体水平位移以及孔压的增长和消散进行观测 ,并采用载荷试验、静力触探和土工室内试验对强夯加固效果进行了检验。研究表明 ,采用强夯法加固以吹填砂为覆盖层的饱和软土地基是可行的 ,有效加固深度可达到 6～ 8m。由于吹填砂层和淤泥质粘土层中的粉细砂薄层有利于孔隙水压力的消散 ,强夯法处理该类地基时 ,可以不设置竖向排水体。

According to engineering geology condition of the different zones of a harbor project, a series of dynamic compaction test were performed. Ground deformation, horizontal displacement of soil mass and pore water pressure were monitored, and compaction effectiveness was tested. Research results show that it is feasible to treat the saturated soft soil covered with hydraulic fill sand by dynamic consolidation method, which effective improvement depth is six to eight meter, and the depth of hydraulic fill sand influences remarkably on effective ramming power and function of gravel-soil cushion. Vertical drainage measure may not be taken because of presence of hydraulic fill sand layer and silty sand layer if the improvement depth is low.