强夯法处治新疆盐渍软弱土的机理及应用

Mechanism and Application of Dynamic Compaction Method in Treatment of Saline Soft Soil in Xinjiang

新疆地区存在的盐渍软弱土采用强夯法处理存在地基液化、土层结构破坏和表层盐分聚集等问题。以新疆开都河某公路工程为例,进行了单点夯、强夯面回铺砾石土和降水井结合回铺砾石土强夯三种方案;并且通过对夯沉量、孔隙水压力和夯后弯沉等参数的分析研究提出合适的强夯方式。试验表明采用降水井结合回铺砾石土强夯;且用两遍点夯和一遍满夯的方式可有效地消除由地下水位高引起的强夯地基液化和夯后结构破坏引起的沉降不均匀现象;此强夯工艺简单,质量易于控制,能给新疆其他盐渍软弱土的地基处理工程提供参考。

There were some problems in the treatment of saline soft soil in Xinjiang area,such as the liquefaction of foundation,the destruction of soil structure and the accumulation of salt on the surface. Three compaction method plans were practiced in highway project of Kaidu River in Xinjiang,single point compaction,back to the gravel soil dynamic ramming and dewatering well combined with gravel soil compaction. And through the analysis of the parameters such as tamping settlement,pore water pressure and deflection,the appropriate dynamic compaction method was put forward. The experiment showed that the plan of dewatering wells combined with gravel soil dynamic compaction,and a full ramming way could effectively eliminate the liquefaction due to groundwater and the uneven settlement caused by the structural failure. Compaction method can handle other salt and soft soil in Xinjiang foundation treatment project to provide reference duo to easy and high quality.