The reason of land subsidence and prevention measures of Beijing segment of Beijing-Tianjin high-speed rail

Beijing-Tianjin high-speed railway is China´s first high-speed passenger rail lines. Its high-speed has strict requirements of rail deformation. The Beijing-Tianjin high-speed rail across the Chaoyang and Tongzhou where affect land subsidence. It mainly affects the track ride and security due to performance of the regional uneven settlement. The research has shown that: the large pumping of groundwater is the main reason of causing land subsidence along Beijing-Tianjin high-speed railway. At the same time, it is also affected by tectonic environment, sedimentary environments and secondary consolidation of the soil etc. Therefore, it need limiting the groundwater pumping near the Beijing-Tianjin high-speed railway. In addition, optimizing the groundwater extraction program and strengthen groundwater monitoring is also necessary. Groundwater recharge is need if there is severely land subsidence.