Simulation Study on the Influence of Differential Settlement of Expressway Subgrade between Old and New
Based on the practice of a highway reconstruction and expansion project in Guizhou province,this paper builds a highway model with finite element analysis software to analyze the development law of uneven settlement at the joint location of the old and new pavement under the influence of incompressible modulus,fill height and widening width.The results show that the settlement of the new and old roadbed is small within 6 m from the center of the old road,and gradually increases in the range of 6～18 m,and the growth rate slows down at the combination position of the new and old roadbed,but the value increases further.The maximum settlement occurs at the edge of the widened roadbed,and the settlement curve shows a"trough"shape at the end.Appropriately increasing the subgrade compression modulus can effectively improve the differential settlement of new and old subgrade and improve the engineering quality.
ExpresswayReconstruction and expansion projectsDifferential settlement
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