| The supply of urban construction land use in China has became increasingly intense. For land saving, all kinds of building developed to the high-level and underground space. In the present moment, deep excavation have became a major part of urban geotechnical engineering. In the excavation engineering, excavation design schemes have play a vital role in the control of surrounding surface deformation, surrounding existing buildings deformation and underground pipelines deformation. these deformation are an important issue involved in the excavation engineering.The paper analyzes the basic theory in deep foundation pit deformation and carried pile-anchor supporting design in the area of Ⅵ by Lizheng, on this basis, using numerical simulation FLAC3 D calculation method, combined with engineering examples to model, summary law, receiving deformation law in the process of deep excavation and supporting. Through the analysis of deformation laws, proposed to design parameters of support are optimized.Firstly, according to the geotechnical investigation data and each working conditions, using Lizheng geotechnical calculation software for deep excavation support design and carried out relevant computational analysis on the supporting structure.Secondly, on the basis of deep excavation designed by Lizheng, applying Mohr-Coulomb soil constitutive model by software of FLAC3 D, establish the three-dimensional finite difference model of retaining structure and soil. According to the numerical simulation results, analysis of the law of excavation deformation under different anchor inclination, different anchor horizontal interval, different anchor prestression, different construction support force and different anchor location.Finally, contrasting the excavation deformation law under different circumstances and analysis of the pit deformation in response to different conditions, given the excavation optimization of design parameters. |
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