The Applications Study Of Sail Nailing In Super Deep Foundation

With the rapid economic development more and more deep foundation pitch appearance, at the same time,the excavation depth deeper. With the excavation depth increases and the increasing complexity of the surrounding environment, the foundation pit of the increasingly high demands. But the deep foundation pit is generally designed as a temporary project. Because it exist a short time, investors are often reluctant to invest a lot of money, and to minimize the cost of excavation support system. The soil nailing has the advantages of low-cost, short construction period, strong adaptability to meet the requirements of today's market. It has been widely applied.At present, a lot of the research and application for soil nailing in deep foundation .In theory and practice has gradually matured. But for soil nail in the super-deep foundation in the application of a relatively small, and its ultra-deep excavation in the mechanism of action, work is still not deep enough understanding of the performance, design and calculation are not perfect. Make a number of practical projects have to invest, to a certain extent, causing a waste. In this paper, results of previous studies and engineering examples were analyzed and summarized. Look forward to the super deep foundation of soil nailing provide useful research and application assistance.The Paper introduces the soil nailing emergence and development. It is the current research status of soil nailing and the soil-nailing the advantages and limitations. Sum up our predecessors on the soil nail force characteristics and slope stability of the results of research. The soil nailing numerical calculation model is established by numerical simulation software FLAC3D. Simulated soil nailing super-deep foundation pit excavation in all stratified conditions, for each working condition of soil nail by the force, displacement and surface slope excavation trends in the settlement to be concluded. The retaining mechanism and working performance of soil nailing are further researched.