The Numerical Simulation And Application Research On Double-row Piles-anchor Cable Supporting Structure In Deep Excavation

Foundation pit is also corresponding to the deep and large with the development of the building to the high-rise and super high-rise, and its complexity is increasing. In more and more actual excavation engineering projects,the theoretical research on the foundation pit support system, the design and construction techniques are constantly developed. This support approach will make double-row piles and anchor cable form an effective whole by rational designing, and give full play to both technological advantages. But the double-row piles-anchor cable supporting structure has not yet been widely used in the foundation pit support,lack of the measured data and the theoretical research has not expanded in-depth. The theoretical research lags behind the actual application. Combined with the results of previous studies based on specific works on the double-row piles-anchor cable supporting structure, in-depth study. The specific findings are as follow:(1)Describes the structure with double-row piles and pile anchor structure at home and abroad research status and main problems.(2)Introduces the earth pressure theory and retaining structure with double-row piles and pile anchor supporting structure common calculation methods.(3)Based on some foundation pit supporting project in Wuhan, using the MIDAS/GTS finite element software to analyze the excavation of foundation pit model, and simulation of the double-row piles-anchor cable supporting structure stress situation in various cases of foundation pit excavation, to analyze the internal force, deformation and the law of the support system and compared with the measured data, given to test the validation and reliability of the MIDAS/GTS software in the simulation of foundation pit supporting.(4)Chooses the distance between two rows, pile diameter, pile length, anchor length, anchor cable prestress as a parameter. The piles displacement and bending moment were respectively simulated by MIDAS/GTS finite element analysis software, and Analysis of the law. Optimizes the double-row piles-anchor cable supporting structure design and make rationalization proposals to provide reference method for future supporting structure design and construction.