水泥搅拌桩加固软土路基的数值模拟分析

Numerical simulation analysis of soft soil subgrade reinforced by cement mixing pile

结合依托工程,对软土地基的加固及沉降进行了有限元数值模拟研究,对软土地基加固前后的沉降情况进行了对比分析,得到了不同水泥搅拌桩各个工况下的加固效果,明确了水泥搅拌桩对路基的加固的有效性,水泥搅拌桩与软土共同作用减小了软土的竖向应力,使软土地基的压缩性降低,降低了路堤的沉降,同时,也减小路堤底面的水平位移值。路堤在填筑过程中,路堤底面中部的沉降值最大,远离中部的沉降值逐渐减小。通过工况的对比分析得出路堤沉降对桩长的变化更加敏感,桩长越长、桩间距越小,加固效果越好。

Based on engineering cases,this paper has carried out finite element simulation numerical research on the reinforcement and settlement of soft soil foundation,compared and analyzed the settlement before and after the reinforcement of soft soil foundation,obtained the reinforcement effect of different cement mixing piles under various working conditions,and made clear the effectiveness of cement mixing piles in the reinforcement of subgrade.The combined action of cement mixing piles and soft soil reduces the vertical stress of soft soil,and reduces the compressibility of soft soil foundation.It reduces the settlement of the embankment and the horizontal displacement of the embankment bottom.In the process of embankment filling,the settlement value of the middle part of the embankment bottom is the largest,followed by both sides.Through the comparative analysis of the working conditions,it is found that the settlement of the embankment is more sensitive to the change of the pile length.The longer the pile length,the smaller the pile spacing,the better the reinforcement effect.