基坑内土体加固对围护结构变形的影响分析

软土地区常采用坑内土体加固来达到减少土体侧向位移的目的。以弹性地基梁法为基础建立了基坑的有限元模型,利用得到的模型分析了坑内土体的加固深度及程度对围护结构变形的影响。结果表明:围护结构的位移随加固深度及程度的增大而减小,且存在着临界加固深度。因此,合理地确定加固深度及程度既能保证基坑安全,又能够节省工程造价。

Effect of improvement soils on lateral deformation of foundation pits

Soil improvement is an effective method to decrease the lateral deformation of soils and retaining structures.Based on the elastic foundation beam theory,a finite element model of foundation pit was established.The effect of soil improvement on lateral deformation of the retaining structures was studied.The results show that lateral deformation reduces with the increase of depth and degree of improvement soils.To save the engineering cost and guarantee the pit safety,it is important to decide the depth and degree of improvement soils.