Study On Optimization Of Soil Nail Wall Retaining Structure Design In Deep Foundation Pit

With the high speed development of modern architecture technology, and the construction scale expands unceasingly, the deep foundation pit projects increase day by day. The difficulty tends to be more serious and the scale tends to be larger. So it becomes more important to study foundation ditch support in deep foundation pit projects. Many new techniques and methods are come forth in the engineering field of deep foundation pit. Among of them, the Soil-Nail Wall as a new retaining system is more and more widely used. And obtain lots of experience in actual engineering. But the theory of this technique is still not opportune. So it is necessary to study the theory combine with engineering project, in order to better instruction project practice.Based on the past research, this paper summarized the function mechanism and the destroyed mode of Soil-Nail Wall, and summarized the design theory and optimization methods of Soil-Nail Wall bracing structures. The paper analyzed the method of seeking safety factor, it depended on geometric parameters to define the position of the critical slip surface. And search for the most optimized soil-nailed length with computer program. Then it can find the most optimized soil-nailed length and safety factor accordingly at the position of the critical slip surface for Soil-Nail Wall support structure. Through theoretical calculations and analysis of engineer case, the method is safe and reliable. The optimization soil-nailed length can satisfy the supported request and at the same time achieve economic for the purpose.This paper compiles the program with Visual Basic language. Through engineer case, the impacts and sensitivity of timbering parameters on soil nailing stability and optimization soil-nailed length are analyzed with Origin 6.0. So this paper could be used in the projects for Soil-Nail Wall design and construction.