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采用非线性有限元法,对带帽CFG桩加固的K29+020断面软基上拓宽路堤新老路基相互作用、加固效果和铺设路面时间进行了数值分析。结果表明,拓宽路堤表面最大沉降为8.9cm,发生在左侧新路肩附近,新路软基沉降主要来自于下卧亚黏土层沉降。下卧亚黏土层中超静孔隙水压力最大,带帽CFG桩复合地基固结速率主要取决于下卧亚黏土层的固结速率。新路软基的固结速率大于老路软基。拓宽路堤表面工后出现负坡率,说明CFG桩加固的新路软基刚度过大,CFG桩复合地基设计可进一步优化。
The nonlinear finite element method is used to analyze the interaction between the old and new embankment, the reinforcement effect and the pavement time on K29 + 020 reinforced soft ground with capped CFG piles. The results show that the maximum settlement of the widened embankment surface is 8.9cm, which occurs near the new shoulder on the left. The settlement of the soft ground in the new road mainly comes from the subsidence of the sub-clay layer. The excess pore water pressure in the sub-clayey soil layer is the largest, and the consolidation rate of the CFG pile foundation with the cap is mainly determined by the consolidation rate of the sub-clayey soil layer. New road soft foundation consolidation rate is higher than the old soft ground. Broadening the embankment surface after the negative slope, indicating that CFG pile reinforcement of new road softness too large, CFG pile composite foundation design can be further optimized.