| With the rapid development of economy,the traffic volumes of expressway are rapidly increasing. A considerable number of expressways in service are no longer satisfy the need for both increasing traffic volumes and social progress, thus more and more highways are pending to be reconstructed or widened. The expressway widening is an important issue starved for solving in highway construction. In this paper ,aimed at the key technical issues of the highway expansion , unifies Tongguan to the Baoji highway extension project, many factors which are about the difference new and old roadbed deformation in the highway expansion project are analyzed by using field test ,laboratory test,numerical simulation and theoretical analysis and so on. The main research contents include the following.(1) By selecting some typical sections, through the geological reconnaissance, soil mechanics assay, researched the changing law of engineering properties of ground under old and new embankments(2) Based on calculation principle of finite element method, sudgrade settlement is obtained by using MARC.Then compared with The Layerwise Summation Method which is the traditional method of calculating the settlement.(3) Through the establishment of the finite element analysis model, the article studied the deformation characters and influencing factors of the interaction between the new and old embankment, simulated the influence of many factors such as the different ways of widening,the different subgrade widening width, the different subgrade filling height, the new embankment material parameters ,the slope excavation and slope cutting of old road on differential settlement.
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