Simulation Analysis Ofcomposite Soil Nailing Foundation Pit Based On ABAQUS

With the development of economy and technology,rock and soil engineering in the excavation problems are also diverse, traditional excavation techniques because of their own limitations, only in a certain range of use, it is sometimes difficult to meet all the requirements, then, the composite soil nailing grew up. Cement mixing pile and soil nailing composite supporting is a commonly used method, cement soil mixing pile can not only play the role of waterproof curtain, also in order to increase the stability of foundation pit, because of its short construction period, good economic effect, construction influence scope is little wait for a characteristic, in the foundation pit has been widely used, because of our country on composite soil nailing in theoretical research started late, relative to lag behind other western countries, so we should make further study, improve its design method, for in both theory and practice have a great breakthrough. The paper sets out, combined with the finite element software for cement mixing piles composite soil nailing internal force and deformation were analyzed. First briefly introduced the concept of soil nailing, and the domestic and international research status existing problems, and the future development trend of the main. Discussion of the limit equilibrium method of internal force and deformation calculation of soil nailing. Then mainly introduces the mechanism of soil nailing and its deformation characteristics, introduces in detail the soil constitutive model--Mohr-Coulomb model theory and its calculation parameter selection problem。The large finite element software ABAQUS in geotechnical engineering is widely used, in the third chapter mainly introduces the basic software features and calculation principle, using the finite element software for foundation pit excavation simulation analysis. By analyzing the simulation results analysis of the foundation pit, horizontal displacements of the soil, ground settlement, internal force of soil nail changes as well as their withexcavation showed changes from different aspects, the rationality of the model and applicability.The paper analyses the soil nailing parameters different influence on the stability of excavation, emphatically discusses the soil nailing inclination, soil nail length, stiffness on the deformation of retaining structure of foundation pit deformation, as the control parameter selection to provide some valuable reference.