Influence of Foundation Pit Construction of Building on Subgrade Deformation of Adjacent Intercity Railway Link Line
The intercity railway link line project between Langfang East and Beijing New Airport Station is located in a soft soil area.Using numerical analysis software to establish a three-dimensional model to simulate the stages of adjacent railway commercial building foundation pit dewatering,excavation,construction,railway track laying and opening,and analyze the impact of foundation pit construction on the subgrade deformation of adjacent intercity railway link line.The results show that the horizontal displacement of railway subgrade caused by foundation pit construction is relatively small,with a cumulative settlement of 32.1～33.6 mm,which could meet the control requirement of post construction settlement not exceeding 150 mm.The railway subgrade settlement is the largest during the foundation pit dewatering and excavation construction stage,accounting for 84.5%of the total settlement.Based on the simulation calculation results and the actual engineering situation,suggestions for the design and construction of foundation pits are proposed,including open drainage and dewatering on the outside of the foundation pit,segmented excavation and support of the foundation pit,synchronous symmetrical construction of four foundation pits,and monitoring of adjacent railway subgrade deformation.
NETL
NSTL
万方数据
