降水换填强夯处理饱和粉土地基试验研究

Construction Measures to Prevent from Undesirable Geological Conditions in the Hu-Chong-Su Experimental Study on Treatment of Saturated Silt Ground by Using Dewatering Replacement and Dynamic Compaction

对地下水位以下较深的饱和粉土地基处理,经过方案比选,采用明沟降水,并进行部分换填加基坑内强夯的处理方法。地基处理试验进行了单点夯及群夯试验,研究表明:大能量的点夯会引起粉砂地基的高度液化,是不利于地基处理的,合理的夯击能可以得到较好的处理效果。通过施工后的载荷试验、标贯试验、干密度试验等检测,以试验所确定强夯的参数处理后的地基土体满足设计要求,处理取得良好的效果。

Through the comparison of the construction schemes the dewatering with open drain, replacement and dynamic compaction are used for the treatment of saturated silt ground under groundwater. The single compaction and the group compaction for the treatment are carried out. The study shows that the high-energy single compaction could result the heavy liquefaction of the silt which is not fit to the ground treatment and that the reasonable compaction power could acquire the well treatment effect. Based on the loading tests, SPT test and the dry-density test after the construction of the ground treatment, the treated soil by using the parameters from the tests for the compaction could meet the requirement of the foundation design.