Analysis On Stability Of Soilnail Support Of Deep Foundation Excavation

Soil nailing construction has the advantages of simple and efficient,economic performance and facilitate to the construction. Especially in the Beijing area,as soil generally more appropriate, thereby becoming the preferred one of the support programme. In this paper, the Chief Staff Officer 2 SANLITUN buildings deep foundation pit support for the project engineering background, on the basis of conducting in-depth analysis In related research results at home and abroad , use the method of integration of site monitoring,theoretical analysis and numerical simulation. Focus on step-by-step excavation of the deep excavation works in the composite soil nail wall supporting structure of the force and deformation . Main work and conclusions were as follows:On the basis of previous research results, geotechnical support of the methods were classified, on the soil nailing the history and development, summarize and compare soil nailing bolt, reinforced earth distinction, the majority of slope stability and soil nails in the wall design Analytical methods were introduced, the paper identified the contents and methods of research. Pit support design of the relevant theories and methods for a more in-depth study of the work under a bolt deformation analysis of the soil nails to the overall stability of soil analysis and calculation and nail-pulling capacity checking. The excavation of soil nailing the whole process of numerical simulation studies show that soil nailing axis of step with the excavation of the number of changes, and gradually increased to stabilizing, the upper soil nail on the soil bound by a greater impact; slope displacement Monitoring results indicate that, maximum at the top of Slope, from the status of the seven shear strain incremental image can be seen, even after the completion of support, at the top of Slope may also sliding.Developed a practical programme of site monitoring, through the monitoring data and analyzed, the master of the construction process in the pit deformation of changes and guidance to achieve the smooth progress of the construction information construction, and by monitoring data and numerical simulation results of the comparison, Numerical simulation to show that soil nail wall for the design and construction made based on theoretical analysis and recommendations.