A Study On Influence Of Anchor Stress For Construction Of Pile Anchor Supporting Structure

In recent years, with the rapid development of urban construction, great construction of high-rise building, and the development and utilization of urban underground space, which will bring large scale excavation and supporting of foundation pit engineering. Among the many forms of foundation pit support, the pile anchor supporting structure is a form of support which has been widely used in our country. Although that kind of supporting structure have continued to a wide range of applications, it also has brought a lot of engineering problems. This paper takes a pile anchor supporting of deep foundation pit engineering in Kunming engineering examples as the background, and analyzes and recalculations the results from the pile anchor supporting structure of foundation pit.Through summarizing the domestic and foreign research results,This paper analyzes some theory and current situation of pile anchor supporting structure in order to have a further understanding of observability and feasibility of pile anchor supporting applied in deep foundation pit. Combined with engineering example, and using the "M" method of elastic foundation beam of deep foundation pit support by Lizheng software, to check the engineering practice results. According to the engineering example, it carries on the Plaxis Software numerical analysis of stress change rule of soil mass in the excavation process, then compares the result with the "M" method, and analyses the differences between both calculation and the cause of differences. Then compareing the results with the actual project monitoring, so as to find out the characteristics of pile anchor supporting engineering of application in two pieces of software. Then through the Plaxis Software to find the foundation pit deformation and internal force change rule under the different locking values, so as to get the determine reasonable locking value.Finally according to the problems arising from the project analyzes the causes of insufficient locking value. And according to the reasons of the prestressed locking value less than put forward some measures to ensure the construction quality to prevent or reduce the shortage problem of locking value. Based on the actual situation of the project, it takes the second compensate tension. Through the way, it obviously reduces the prestress loss, and the project has obtained the good effect, it also has played a reference for other similar projects.Through the study of the paper, it provides a certain basis and reference value for the pile anchor supporting system in the engineering application, and makes pile anchor supporting system have a important guiding significance in the construction.