ANALYSIS OF THE IMPACT OF BUILDING FOUNDATION PIT CONSTRUCTION ON SUBWAY TUNNELS AND RESEARCH ON CONSTRUCTION COUNTERMEASURES
Based on the construction example of Biyue square foundation pit located above the interval tunnel between Chencun station and Chencunbei station in the north extension section of metro line 7,this paper establishes a three-dimensional numerical model of the foundation pit and the interval,and conducts numerical simulation analysis and research on the influence of basement pile foundation construction and foundation pit excavation on the interval tunnel.The results show that:(1)during the drilling process of the basement pile foundation,the overall deformation of the shield tunnel is relatively small,and the tunnel is basically in a safe and controllable state;(2)during the excavation process of the foundation pit,the internal force of the shield tunnel segment structure meets the requirements of strength,stiffness,etc;(3)during the construction process of the foundation pit,it is necessary to minimize the disturbance to the stratum as much as possible to ensure the safety of the existing tunnel.The research results have proven that the construction of pile foundations and excavation of foundation pits in this building have a safe and controllable impact on interval tunnels,and relevant construction control measures have been provided,providing a theoretical reference for similar engineering construction.
pile foundation constructionexcavation of foundation pitinterval tunnel
万方数据
维普
