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为了增强CFG桩处治软土路基方案的合理性,使不同工况下的软基沉降达到均衡,建立三维有限元数值模型对路基横断面方向沉降进行计算,得出了横断面方向路基沉降变化规律,并对比分析了不同CFG桩平面布置方案的复合地基承载力,确定了基于均衡沉降控制的软基CFG桩处治方案。结果表明,路基高度为3～8m时,路肩处沉降量是路基中心沉降量的47%～77%,坡脚处沉降量是路基中心沉降量的0.4%～0.7%,对地基进行CFG桩加固处理时,边坡部分CFG桩间距可以适当加大,达到地基承载能力的平衡,CFG桩平面布置方案调整后,复合地基承载力能够满足要求,综合考虑地基变形均衡性和工程方案经济性,采用CFG桩加固地基时,路肩到坡脚范围内桩间距可增大0.5m。
In order to enhance the rationality of CFG pile in treating soft soil roadbed and to make the settlement of soft ground under different conditions reach equilibrium, the three-dimensional finite element numerical model is established to calculate the subsidence of subgrade cross-section, and the law of subgrade settlement in transverse direction is obtained The bearing capacity of composite foundation with different CFG pile plan was compared and analyzed. The treatment scheme of CFRP pile based on equilibrium settlement control was determined. The results show that when the subgrade height is 3 ~ 8m, the settlement on the shoulder and shoulders is 47% ~ 77% of the subgrade settlement, and the settlement at the foot of foot is 0.4% ~ 0.7% of the subgrade settlement. CFG pile reinforcement During the treatment, the spacing of some CFG piles in the slope can be properly increased to balance the bearing capacity of the foundation. After the plan of the CFG piles is adjusted, the bearing capacity of the composite foundation can meet the requirements. Considering the foundation deformation equilibrium and the project scheme economy, When the CFG pile reinforces the foundation, the pile spacing between the shoulder and the foot of the slope can be increased by 0.5m.