Study On Influence Of Groundwater Exploitation In The Tianjin Area On The Beijing-Shanghai High-Speed Railway Roadbed Settlement

Groundwater exploitation mainly refers to the people for the development and utilization of water resources below the surface. With the conduct of reform and opening up, China is in a high-speed development period, consisting mainly of various high-speed railway engineering activities more and more frequent, increasing the demand for water resources. Many data show that there is a certain relationship between land subsidence and groundwater extraction. Many parts of China led to the phenomenon of land subsidence due to over-exploitation of groundwater has become increasingly prominent, economic loss is also increasing.Tianjin is located in the North China Plain, is one of the China’s municipalities, the Bohai Rim economic center.Beijing-Shanghai high-speed rail through the land subsidence phenomenon is more obvious, as the area of land subsidence phenomenon has become increasingly serious, and have had a great impact on the construction and operation of high-speed railway, land subsidence caused by groundwater exploitation on the Beijing-Shanghaistudy the impact of the existence of high-speed railway, the Beijing-Shanghai high-speed railway normal and safe operation of great significance.In this paper, the Beijing-Shanghai high-speed railway through the Tianjin section as the research object, a comprehensive survey of the region’s groundwater extraction conditions and land subsidence geological background and. combined with the physical geography of Tianjin, engineering geological and hydrogeological conditions, and land subsidence and development of the basic situation, analysis of the formation mechanism of the Tianjin area of land subsidence and sedimentation characteristics and influencing factors. Previous years, land subsidence and groundwater extraction data analysis, the correlation between the two. On this basis, based on past project examples and geological data, select the Beijing-Shanghai high-speed rail along the Tianjin section of a region for the study, and use and the the Plaxis software that create a two-dimensional model, different water level drawdown under the bridge foundation force and displacement characteristics; small-scale land subsidence caused by mining groundwater numerical model, with Flac3D fluid-structure interaction analysis of local land subsidence caused by mining groundwater in the study area subgrade settlement and deformation effects,and draw relevant conclusions.