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从研究CFG桩复合地基的沉降出发,应用PLAXIS二维有限元分析软件对新建铁路曲阜站路基沉降进行了分析,比较了用带桩帽和带筏板的CFG桩加固地基后对地基沉降的影响。分析表明,两种CFG桩复合地基的最终沉降相差较小,均能满足设计要求。带筏板和带桩帽的CFG桩复合地基在坡脚处的水平位移变化较小,表明施工过程中路基边坡是稳定的。用带桩帽的CFG桩代替带筏板的CFG桩加固软土地基在技术上是可行的,在经济上是合理的。
Based on the study of settlement of CFG pile composite foundation, the settlement of subgrade of Qufu station of new railway was analyzed by PLAXIS two-dimensional finite element analysis software. The effect of CFG pile with pile cap and raft on ground settlement was compared . The analysis shows that the final settlement of the two kinds of CFG pile composite foundation is small, which can meet the design requirements. The horizontal displacement of the CFG pile composite foundation with raft and pile cap with a small change at the foot of the slope shows that the subgrade slope is stable during construction. Replacing CFG piles with rafts with CFG piles with pile caps is technically feasible and economically reasonable.