Numerical Analysis Of Stress And Strain Of Soil Nailing Pile And Anchor Combined Excavation

In recent years,as China's economic development is very rapid,with the implementation of the urbanization policy,and as the population stimulated,city land increasingly tense,more and more high-rise and super high-rise buildings,subway,tunnel and other facilities have been used in our life,the deep foundation pit engineering is closely related with the got rapid development,with the emergence of a large number of high-rise building and super high-rise buildings in the city,from shallow to deep foundation pit,the construction time is from less to more,and the surrounding environment more and more complex,so we are on solid security problems in foundation pit construction should pay enough attention and corresponding solutions.As the foundation pit engineering is seriously affected by the surrounding environment and geological conditions,the pile anchor supporting structure is widely used because of its many advantages,such as space saving,convenient construction,low noise,good supporting structure and so on.Based on the research of deep foundation pit of Zhengzhou Tianhong building as the research object,and the project is divided into seven step excavation construction process for the specific object of simulation,soil nailing and pile anchor joint supporting work performance are summarized,Then select the FLAC3 D numerical simulation software to model the foundation pit.The supporting system of foundation pit soil and the displacement and internal force characteristics is analyzed in detail.The main results of this paper are as followsThe research based on the current theory,using the finite difference numerical simulation of foundation pit excavation engineering and supporting the process of software FLAC3 D,analyzes deeply the excavation of soil,retaining structure and pile support in internal force and displacement of support before and after the law,comparative analysis of simulation results.Branch belongs to the support structure and the surrounding foundation pit soil interaction relationship with the construction process down,the excavation depth increases,the foundation soil pile displacement is also increasing,when the excavation reached a final depth when the change curves of horizontal displacement of the pile body presents a similar "spoon shape,the maximum displacement of the pile at the position near the pit mouth;Through the numerical simulation analysis of FLAC3 D,the change of the internal force of the support system in the excavation process is simulated.The working principle of the supporting system is presented from the moment of the pile,the shear stress of the foundation pit,the uplift and the settlement of the soil around the foundation pit.This paper analyzes in detail the excavation under different conditions of soil nailing combined pile anchor supporting the displacement and internal force characteristics of the supporting methods in the construction process more predictable,which provides an important reference for the design and construction of supporting method.