| Summary: | To complete the technology upgrade of the Kunshan section of the Beijing-Shanghai Railway, the secondary preloading of the original sand pile foundation was carried out in five years after the completion of the railway. Whether the control requirements of the post-construction settlement of the upgraded railway could be met was the key. Therefore, in this paper, the author analyses the consolidation deformation law of the sand pile foundation, sets up the membership function to describe the conversion from the drainage by consolidation to the composite foundation based on the Ascend Semi-cauchy Distribution Function of the Fuzzy Mathematics Theory, puts forward the time expression of the consolidation degree, verifies the computational accuracy of the expression by measured data and confirms that the e-lop curve method which considers the historical influence of the soil stress is more accurate in calculating the total settlement of the secondary preloading after comparison and calculation because this method can achieve the precise calculation of the post-construction settlement with the expression of degree of consolidation mentioned above.
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