Research Of Dynamic Construction Of Deep Fundamental Pit For Chengdu Metro Station

Urban rail transit, also called metro, is the main approach for solving city communication beyond present technology, so metro construction is main stream in our country in recent30years. The subway station construction is the key process in subway construction, and one of the most key working procedure station construction is "deep foundation pit construction", is the subway station construction process time limit, safety, cost and quality control of the throat. With all kinds of complicated conditions of deep foundation pit engineering emerge in a large amount, in theory of classical soil mechanics already cannot satisfy the requirements of foundation pit engineering, the finite element theory and system engineering soft science has been used in foundation pit in, engineering and technical personnel must be targeted in theoretical analysis, the model test, the scene monitoring many aspects, such as study in detail, so as to ensure the smooth implementation of foundation pit engineering. In this paper a metro station chengdu deep foundation pit change design options for research, and through the field monitoring and the method of numerical simulation of with complex of the support structure of deep foundation pit construction dynamic analysis, the conclusion that part for later to provide theoretical basis for the engineering practice.It focuses on numerical simulation and theoretical optimization on dynamic construction of deep fundamental pit; it also studies on methods and drafts on dynamic construction of deep fundamental pit.dynamic Research methods including the finite element theory research and the long-term monitoring of two parts, final contrast analysis, in deep foundation pit excavation obtained in the process of dynamic displacement of foundation pit excavation, geotechnical engineering and internal stress of palisade structure, and foundation pit stability features dynamic change regulation, and based on the analysis of construction technology optimization. This paper analysis, in construction process the foundation pit stability coefficient reaches more than3.2, the stability is better; In construction of the foundation pit displacement is mainly affected by the before stage construction is affected by the internal stress changes everywhere foundation pit excavation depth affected; A and other palisade structure, interior support more, design and construction of advantage can give full play to its advantages.