Abstract
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.
Highlights
Please Sand pile composite foundation is a kind of bulk solid pile composite foundation which has been applied earlier
Based on the consolidation theory of the sand drained foundation and the composite foundation, and the Ascend Demi-cauchy Distribution Function of the Fuzzy Mathematics Theory which describes the degree of how the sand pile-net composite foundation is attached to the vertical drains foundation and the composite foundation at some point, the time expression of the consolidation degree of the sand pile-net composite foundation is proposed
Β, which is in U 1 e t, expresses how the sand pile foundation is attached to the vertical drains foundation and the composite foundation
Summary
Please Sand pile composite foundation is a kind of bulk solid pile composite foundation which has been applied earlier. Because of the extremely strict control requirements of the post-construction settlement of the high-speed railways, the rigid pile which is safer and more conservative is used more in foundation treatment. The surcharge preloading was carried out in the original testing section for the second time without changing the reinforcement measures relying on the sand pile-net composite foundation. The calculation of the postconstruction settlement after the secondary preloading of sand pile composite foundation which has been put aside for five years is demanded to be highly accurate. In this paper, the author analyses the consolidation deformation law of the sand pile foundation, considers the historical influence that the secondary preloading exerts on the soil stress, puts forward the degree of consolidation and the calculation of the total settlement, which provides suggestions and help to the sand pile foundation in the field of railways
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