Study on Superposition Effect of Surface Settlement Caused by Subway Station Open and Subsurface Excavation Construction
To meet the efficient development demand of large underground spaces in complex ground environments,the trend of combining open and subsurface excavation for underground engineering construction is becoming increasingly evident.However,the close interaction between open and subsurface excavation inevitably leads to the superposition effect of ground deformation,and studying its regularity is essential for construction control and environmental safety.This paper takes the Xuzhou Subway Pengcheng Square Station engineering project as the background,and uses literature research and numerical simulation methods to study the regularity of ground deformation caused by the excavation of a combined open and subsurface excavation for the subway station,and compares it with the ground settlement characteristics caused by a single form of open or subsurface excavation.The research results show that the superimposed effect of ground settlement caused by open and subsurface excavation is closely related to the excavation sequence and spacing between the distance of foundation excavation and tunnel.The ground settlement superposition form changes with the distance between the distance of foundation excavation and tunnel,evolving from a single concave groove to a double concave groove with increasing distance.The maximum ground settlement caused by subsurface excavation in the open first and subsurface second sequence is generally amplified,while the maximum ground settlement caused by open excavation in the tunneling first and open second sequence is generally reduced.
NETL
NSTL
万方数据
