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对某高速公路软基试验段填砂路堤下CFG桩复合地基承载力特性进行了现场试验,同时采用有限差分法建立数学模型,对复合地基桩土应力与土体沉降进行了数值仿真计算。结果表明:现场实测路堤加载下的桩土应力比与静载试验测试的桩土应力比相差较大,数值计算的桩土应力与实测路堤加载下的桩土应力比较为吻合。目前采用静载试验确定路堤荷载下CFG桩复合地基承载力是不合适的,该文的研究成果可为该地区公路软基CFG桩复合地基设计提供参考。
The field test on the bearing capacity of CFG pile composite foundation under the embankment of soft ground in a highway soft foundation was carried out. At the same time, the mathematical model was established by finite difference method, and the pile-soil stress and soil settlement of the composite foundation were numerically simulated. The results show that the pile-soil stress ratio under the load of actual embankment in the field is quite different from the pile-soil stress ratio under the static load test. The calculated pile-soil stress agrees well with the measured pile-soil stress under the embankment load. At present, it is unsuitable to use static load test to determine the bearing capacity of CFG pile composite foundation under embankment load. The research results of this paper can provide reference for the design of highway CFG pile composite foundation in this area.