The Stress And Deformation Analysis Of Soil Nailing Structure

With the development of society and economy, the urban underground space is expangding continuously. Excavation requires higher stability and many structures do not match the supporting design, so excavation accidents occurred sometimes. Therefore, the theory of excavation design and improving the technical level of construction excavation is the most urgent problem. It has a great significance of improving the theory of excavation for the the construction of excavations.This article first elaborates soil nailing structures including the characteristics、development history and the research status, then analysis the mechanism and deformation characteristics of soil nailing and an in-depth discussion of calculation method of soil nailing. Finally,based on a particular foundation excavation in Xingtai,three-dime-nsional numerical model is built by using the finite difference software FLAC3 D software. In the model, Mohr-Coulomb is used to simulate the actual soil;anchor elements is used to simulate the soil nailing and housing unit is used to simulate surface layer. The Model simulates the whole excavation process of three-dimensional numerical simulation. According to the calculation results analysis of the following contents:(1) Combined with specific engineering geological conditions to establish the three-dimensional numerical model and select appropriate soil nailing,the surface layer and soil parameters.(2) Simulating and analysising the excavation displacement field,the distribution of stress field, soil nailing axial force the situation and distribution by force. Forecasted and evaluated the feasibility and reliability.of supporting programs.(3) By no-supporting excavation simulation,the stable height of excavation soil is analysised in detail.(4) By comparing the simulation and measured values, three-dimensional numerical simulation calculating results is verified.