复杂地质条件下的地基加固方案设计

On Subgrade Strengthening Plan Design under Complicated Geological Conditions

某地道工程地处地质条件复杂的丘陵地区,需进行大量深挖方和高填土。简单介绍了复合地基加固方法原理,确定采用CFG桩和预制桩进行复合地基处理的加固方案。在此2种加固方案工况下,通过对基础埋置深度范围内的地基承载力计算,桩间距的计算,以及结合水库高边坡的实际工程情况,进行边坡稳定性对比分析。结果显示采取抗剪承载力高的方桩进行复合地基加固可有效提高水库边坡的稳定性系数。最后经综合考虑,确定预制桩复合地基加固方案为该工程最佳地基处理方案。

A tunnel project is located in hill country under complicated geological conditions with requirement for a large amount of deep excavation and high fill.The principle of composite foundation strengthening method is introduced briefly in this paper,and the strengthening plan of CFG pile and precast pile is determined.Under these 2 kinds of strengthening plan conditions,the calculations of bearing capacity of foundation soil in the scale of foundation buried depth and space between piles are finished,then the slope stability is made a comparative analysis with the background of the reservoir's high slope practical engineering.The results show that the square pile with high shear bearing capacity can improve the stability coefficient of the slope markedly.Finally,the precast pile composite foundation strengthening plan is recommended as the best choice for this project after a comprehensive consideration.