Numerical Simulation And Stability Analysis Of Soil Nailing Support In Deep Foundation Pit

The support structure of Soil nailing is one of the support form used in foundation pit. It not only has the common characteristics of foundation pit support form but also has some specialities. In this paper, four aspects of soil nailing were expatiated in detail. Many factors that influence the foundation pit support are considered, and the principle of soil nailing support is analyzed correctly.(1) Construction mechanics problem The structure shape will be changed along with the construction course. In the course of construction, the external loads will be changed accordingly. Foundation pit engineering is one of the unload problem in the construction mechanics. The computation of excavation load can be regard as the process that the stress of excavation surface is released completely and the excavation surface then changed into the free stress surface. The method of Mana is used to compute the excavation load in this paper. The method of Mana is one of the finite element method, and the method is rather effective.(2) Active support form The support form of soil nailing can preserve, enhance and impose the soil intension of foundation pit walls. It can change the soil loads into one part of the support construction system. So the soil nailing support can be regard as the initiative support form. The support form has the advantages and can be used widely.(3)Nailing-soil interaction It is well known that the characteristics of soil is different from the characteristics of soil nailing, and the distortion of them is disagreement. The shearing stress will come into being in the contact surface. The shearing stress is the medium that can transfer the load between soil and soil nailing. It is very important to analyze the principle of deformation, the development of shearing destruct, the process of load transfer and simulate them correctly. In this paper, the interface element is used to simulate the interaction between soil and soil nailing. It is indicated that the interface element can simulate the soil-nailing interface perfectly.(4) The validation of the slope stability by soil nailing The strength reduction finite element method is used to analyze the stability of the slope timbered by soil nailing and the slope timbered by the traditional support form. It is proved that the stability of the slope timbered by the soil nailing is ideal.