On the basis of and after adjustment to Consolidation Settlement Theory, a calculation method for post-construction settlement for high speed railway group piles foundation is put forward and the calculation formula is deduced accordingly. By the application of Gray System Theory GM (1,1) model, metabolism GM (1,1) model is worked out. Through comparative analysis with settlement observation data of one pier of Yunzaobang major bridge, the post-construction calculation method and Gray System Theory prediction method proposed in this paper are proven applicable in engineering practice.
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