铁路柔性基础下CFG桩复合地基承载力确定方法研究

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。

Study on the Determination Method for the Bearing Capacity of CFG Pile Composite Foundation under the Flexible Foundation in Railway

According to the actual situation that the railway embankment of railway CFG pile composite foundation is flexible foundation,numerical analysis and field test are used in the research on the determination method for the bearing capacity of CFG pile composite foundation under the flexible foundation in railway.The research results of numerical analysis and field test show that the regularity for the settlement and stress of the piles and soil between piles varies distinctly in the conditions of flexible and rigid foundation,and there is a great difference in the load sharing ratio of piles.Therefore,the current method of rigid foundation is not suitable for the determination of the stress condition under the flexible foundation.As a result,flexible loading test is recommended to be used in determining the bearing capacity of CFG pile composite foundation under the flexible foundation in railway.