Analysis of Deformation Effect of Deep Foundation Pit Construction on Operating Subway Tunnel Group
With the rapid development of cities and the widespread distribution of subway tunnels, the contradiction between the devel-opment of underground space in subway protected areas and the safety of tunnel structures cannot be ignored. This article relies on a foundation pit project near four subway tunnels in Shanghai and uses numerical simulation to predict the impact of foundation pit exca-vation on tunnel deformation and clarifies the environmental impact control points caused by subsequent construction. Combined with measured data, the deformation law of the tunnel is analyzed. The research results show that foundation pit construction can cause cer-tain uplift of tunnels buried deeper than the excavation depth. The lateral convergence deformation of tunnels mainly shows an increas-ing trend under the lateral unloading effect. Pit construction in soft soil layers may cause certain disturbances to tunnels beyond a dis-tance of four times the excavation depth.
foundation pit excavationmultiple tunnelsnumerical simulationdeformation analysis
万方数据
维普
