强夯加固饱和粉质黏土地基现场试验

Field Test of Dynamic Compaction of Saturated Silty Clay Foundation

结合山东省某在建高速公路工程,针对其场区土层分布为含淤泥质夹层的粉质黏土地基情况,对强夯法加固此类地基的适用性及相关强夯参数进行了现场试验研究。通过研究夯击过程中超孔隙水压力随夯击次数和深度的增长、消散规律,以及夯沉量随夯击次数的变化规律,提出合理的强夯参数、施工间歇时间、止夯标准等施工参数。同时,通过数值计算分析强夯加固后地基的工后沉降,进一步验证强夯法加固饱和粉质黏土地基的可行性。

Based on a highway project under construction in Shandong Province,the field test on the applicability and relevant dynamic compaction parameters of dynamic compaction method for strengthening such kind of foundation was carried out for the silty clay foundation with soil layer distribution in the field.By studying the increase and dispersion of the excess pore water pressure with the variation of time and depth of ramming during the ramming process and the variation law of the ramming volume with the variation of ramming times,some construction parameters such as reasonable dynamic compaction parameter,construction interval and compaction stopping standard were proposed.Meanwhile,the post-construction settlement of the foundation after dynamic compaction was analyzed by numerical calculation,which further verified the feasibility of dynamic compaction for saturated silty clay foundation.