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针对铁路CFG桩复合地基上的铁路路堤为柔性基础的实际情况,运用数值分析和现场载荷试验,研究铁路柔性基础下CFG桩复合地基承载力的确定方法。数值分析和现场载荷试验均表明,柔性基础下CFG桩复合地基中桩及桩间土的沉降和受力规律与刚性基础差别较大,桩的荷载分担比差别也较大,故目前采用刚性基础的方法确定铁路柔性基础下的CFG桩复合地基承载力是不合适的,而柔性载荷试验可以更好地反映铁路柔性基础下CFG桩复合地基的实际受力情况。因此,建议采用柔性载荷试验确定铁路柔性基础下的CFG桩复合地基承载力。
Aiming at the fact that railway embankment on railway CFG pile composite foundation is a flexible foundation, the method of determining the bearing capacity of CFG pile composite foundation under railway flexible foundation is studied by numerical analysis and on-site load test. Numerical analysis and field load tests show that the settlement and stress laws of the CFG pile composite foundation between the pile and the pile soil are quite different from the rigid foundation and the pile load sharing ratio is also quite different. Therefore, the rigid foundation Method to determine the bearing capacity of CFG pile composite foundation under the railway flexible foundation is not appropriate, and the flexible load test can better reflect the actual stress situation of the CFG pile composite foundation under the railway flexible foundation. Therefore, it is suggested to adopt flexible load test to determine the bearing capacity of CFG pile composite foundation under railway flexible foundation.