Study on Disturbance Law of Shield Tunnel in Saturated Old Loess Area
Combined with the shield tunnel project between Baozicun Station and Yangjiazhuang Station of Xi'an Subway Line 8,the monitoring points of horizontal displacement and surface settlement of the tunnel heading face are arranged.The field measurement method was used to monitor the horizontal displacement and surface settlement of the tunnel heading face under different shield chamber earth pressure,and the large deformation of the saturated old loess caused by the influence of shield construction was analyzed.The research results show that increasing the chamber earth pressure is beneficial to improve the maximum lateral settlement of the surface.When the chamber earth pressure is not greater than the water and soil pressure,increasing the chamber earth pressure can reduce the lateral disturbance range of the shield.When the chamber earth pressure is greater than the water and soil pressure,increasing the chamber earth pressure has no significant effect on the reduction of the lateral disturbance range of the shield.
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