The Influence Of The Land Subsidence Around Su-Xi-Chang Area To The Beijing-Shanghai High-Speed Railway

Land subsidence is an environmental and geological phenomenon in the role of natural and human factors, with the topsoil of crust compressed and the regional ground elevation slowly reduced. Located in the south of Jiangsu province, as a part of the Yangze River Delta, the Su-Xi-Chang area is one of the most developed areas in China in the field of economy and culture.However, the conflict between the resource and environment is becoming more and more serious, with the rapid economic development of Su-Xi-Chang area, the rapid population growth and the accelerating urbanization. In particular, the exploitation of ground water resources has led to a large area of subsidence, which has a grave threat to the normal operation of the Beijing-Shanghai high-speed railway. To carry out the situation investigation and cause analysis and to discuss the influence of the land subsidence around Su-Xi-Chang areat to the Beijing-Shanghai high-speed Railway and the corresponding control measures are of important scientific value to the prevention and control of land subsidence and the guarantee to the operation and safe of the Beijing-Shanghai high-speed railway.The paper investigated the geological background of Beijing-Shanghai high-speed railway in the research area. Combining with the physical geography, the geological conditions and the basic situation of the subsidence, it analyzed the formation mechanism and characteristics in detail. Then it reviewed the genetic mechanism of land subsidence and its influencing factors and analyzed the main factors of the land subsidence. On this basis, the paper selected a small area along the Beijing-Shanghai high-speed railway as the object for the study. Based on the relevant projects and geological materials, the subsidence of the embankment of the high-speed railway caused by the exploitation of the shallow groundwater was simulated with the detail. Analysis the influence to Beijing-Shanghai high-speed rail embankment resulted by the exploitation of the shallow groundwater, a range of the related conclusion was then obtained. This paper still reviewed the influence of the high-speed railway caused by the subsidence, combining with the conclusion from the simulation. Finally, the relating measures to control and reduce the harmfulness caused by the subsidence were proposed.