The Optimizing Design In The Retaining Structures Of The Deep Foundation Pit

ABSTRACT:In the conditions allowed, cut and cover method is widely used in the excavation of deep foundation pit. When we select the supporting structures, there are several types widely used, Bored pile with steel support,Bored piles and anchor, Underground continuous wall with steel support. The support type Underground continuous wall and anchor cable is relatively applied less.This article, which take the Kunming Chenggongnan subway station deep foundation pit engineering as researched background, using a finite difference code FLAC3D,taking half of the standard section along the foundation pit as an example, represents the numerical simulation. I contrast the simulated results to the monitoring results according to statistical analysis in the process of construction. And then the influence to the environment in the process of the deep foundation pit excavation was researched.Finally, the feasibility of different support system scheme was discussed.In the numerical simulation, I used the mohr-coulomb model to simulate the foundation pit excavation. Firstly, I analysed the internal force and deformation of the supporting structure, the influence to the surroundings during the excavation, using the underground continuous wall with steel support. Secondly, in order to discuss the feasibility of different support systems, the support system of underground continuous wall with anchor cable was simulated in order to know its supporting effect and whether it is appropriate for the foundation pit in Kunming area. Finally, according to the analysis comparing the monitoring results to numerical simulation results, through the economic and technological comparison, the support system type of underground continuous wall with anchor cable has certain advantages on time limit, cost, safety and the degree of construction influence.