Structure Internal Force Monitoring and Analysis for Subway Tunnels in the Function of Adjacent Bridge Pile

A scheme for monitoring structural forces and pressures of the surrounding rock is drawn up for the shallow depth bored tunnel of a subway station in Beijing.According to the monitoring data,the change characteristics of structural forces and rock pressures during the construction are analyzed under the influence of bridge pile foundation.The trends of structural forces and rock pressure are under control,and the reference information is provided to judge the stability and safety of the tunnel by monitoring information feedbacks.There are several monitoring conclusions as follows:the invert of shallow depth bored tunnel has a high pressure;tunnel distortion produces dissymmetry in the function of adjacent bridge pile,as result the rock pressure increases a lot;and the structure internal force of tunnel is different under the influence of adjacent piles or not.