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针对复合地基在路堤荷载下与刚性基础下受力结构模式存在一定的差异,对江西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,同时采用有限元差分软件FLAC3D建立模型,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,静载试验测试桩间距1.5m的桩土应力比为5.58,与实际路堤加载监测值2.26和数值计算值2.72有一定的误差。因此,对于本工程仅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。
In view of the difference of composite foundation under the embankment load and the rigid foundation, the bearing capacity of CFG pile composite foundation under the embankment of soft ground in Jiangxi soft ground is tested in field. At the same time, the finite element difference The software FLAC3D is used to establish the model to simulate the pile-soil stress and soil settlement of the composite foundation. The results show that the stress ratio of pile to soil with the test pile spacing of 1.5m is 5.58, which is different from the actual embankment loading value of 2.26 and the calculated value of 2.72. Therefore, it is not suitable for this project to use only static load test to determine the bearing capacity of CFG pile composite foundation under embankment load.