Study On Ground Settlement Because Of Excavation Of Multi-cavern

This paper describes the project background and international research current situation briefly, so puts forward the problem to study; introduces construction methods in the subway station at present and coherent situation of Xuanwumen subway station; analyses the character of ground settlement of single-carven tunnel,double-carven tunnel and multi-cavern caused by the construction; simulates the excavation of the multi-cavern at the background of Xuanwumen subway station and compares the numerical simulation result with the on-the-spot monitoring data.At present, the shallow buried tunneling method includes various construction methods. These construction methods have their respective strongpoint,shortcoming| and the range of applicability. The multi-cavern method has been applied on the construction of the Xuanwumen subway station. This method will cause little traffic disturbance,little bug dust,little noise and control the ground settlement effectively, so it is applied extensively on the construction of subway station and has obtained remarkable economic and social benefit.Different construction sequence will cause different effect on environment. Because of the non-linearity on procedure of the excavation of the multi-cavern, it is necessary to find out a rational sequence of excavation to weaken effect on the environment, it is that this paper emphasizes. Based on the Xuanwumen station of subway line No 4 of Beijing, this paper establishes mechanics and calculation model, and then simulates and analyses the interaction effect among the excavation of the multi-cavern using FLAC, and explains the interaction effect through the ground settlement and soil displacement. At last, this paper analyses the monitoring data on-the-spot and compares it with the stimulant result, and then obtains a few instructive results to supervise design and construction of the subway station.