The Mechanical Analysis On Construction Of Tianfu Plaza Deep Foundation Pit In Chengdu Metro

The thesis is based on the investigation and comprehensive analysis of applicability and method adopted in current retaining structure in deep foundation pit, and the research of dewatering in deep foundation pit . Combined with the scientific research problem of mechanical analysis of retaining structure in deep foundation pit and it's influence to surroundings. This thesis through a example of Tianfu Plaza deep foundation pit engineering in Chengdu metro, soil nail retaining,anchor-draw pile retaining and retaining with strut etc.several works are separately simulated by numerical method. Program of finite difference method is applied to study stress displacement, settlement and influence to surroundings.By numerical analysis method of retaining structure in deep excavation , it draws basic stress law of soil nai anchor and strut ,at the same time , it draws basic deformation law of retaining structure.The resut show, stress of retaining structure is vary in different construction stage.By numerical analysis method of retaining structure in deep excavation basing of water/soil coupling, considering the dewatering , it draws the influence to surrounding during excavation.The resut show that dewatering in excavation will influence the settlement of surrounding.At last.the failure pattern of sand-cobble deep excavation in Chengdu is researched,and then,the suitable retaining structure is given.These results should be of guiding significance to design and construct retaining engineering in sand-cobble deep excavation in Chengdu.