Research On Settlement Of Highway Subgrade In Soft Soil Area Of Lake Sediments

Since the reform and opening up, China’s economic strength has been continuously improved, the highway construction has been rapid development, provide favorable conditions for the development of geological and geotechnical engineering, but also improve the need to deal with the construction requirements of modern highway on the geological and geotechnical engineering. Coastal and inland plain, mountain area of our country the distribution of a wide range of saturated soft soil, in this kind of soft soil foundation construction of the highway is extremely difficult, in order to prevent the emergence of subgrade instability or excessive settlement, must on the foundation reinforcement treatment, otherwise, easy to influence normal use of highway engineering construction and the immeasurable.In today’s society has accumulated a lot of methods and experience of treatment of soft soil foundation. This paper mainly relying on Hengshui Xing Heng highway phase project to carry on the research of the long short pile composite foundation, the dynamic compaction method, cement mixing pile composite foundation. Respectively on the effect mechanism of three foundation treatment methods and key points of construction site analysis.Settlement is one of the important index of expressway subgrade treatment and subgrade filling quality detection, subsidence monitoring is the most intuitive understanding of highway settlement way. Highway subgrade uneven settlement is directly related to whether the completion in use after the opening of road engineering to meet the requirements, the differential settlement will cause pavement crack is too large, or even unstable roadbed collapse, so on highway engineering settlement monitoring work for construction control is very necessary.This paper respectively on three different foundation treatment methods are simulated using the ABAQUS software,according to the analysis of the data was checked data of income construction measurement and finite element simulation,analysis of the factors of causing highway roadbed subsidence,and carried on the research of expressway soft soil roadbed settlement regularity under different conditions.There are different conditions different construction period of settlement data,fitting the data to get the corresponding settlement monitoring data by mathematical method,predict the later settlement changes,in order to take appropriate control measures and reasonable construction of the future construction.