ANALYSIS OF CORRELATION BETWEEN GROUNDWATER EXPLOITATION AND LAND SUBSIDENCE IN CERTAIN AREAS ALONG BEIJING—SHANGHAI HIGH-SPEED RAILWAY

Except the impact of soft soil,the main influencing factor of land subsidence is the long-term over-exploitation of groundwater along Beijing—Shanghai High-speed Railway(BSHR).Combining with the results of DInSAR and precise ground leveling,taking the land subsidence anomalous area(caused by deep-well pumping in a thermal plant) in Yangliuqing town,Xiqing district of Tianjin for example,through the analysis of geological structure and hydrogeological conditions of the pumping wells region,the hydrogeological conceptual model is established;and the numerical simulation research on groundwater level variation caused by groundwater exploitation is carried out with Visual Modflow software.Based on the research above,according to the correlation between land subsidence and groundwater level variation,the land subsidence under different groundwater exploitation amounts and different exploitation times are calculated;and the land subsidence amplitude and velocity under BSHR are predicted.The countermeasures can be put forward for the safety of high-speed railway according to the research.