| With the reform of city expansion and the old city reformation, a large number of deep foundation pit engineering in the region of miscellaneous fill. In order to ensure the smooth development of scientific research in the field of research, the miscellaneous fill foundation pit engineering area gradually. In this paper, the composite soil nailing wall with two slope reinforced shotcrete slope supporting schemes for deep foundation pit of miscellaneous fill slope retaining, the means of support in the practical engineering feasibility and stability.According to the business district Beijing goalkeeper5A-1#5A-4#and slope of foundation pit supporting project as the project background, from the project site monitoring and dynamic construction combination, monitoring data and simulation results, theoretical knowledge and engineering practice, mathematical theory and the practical need of society, point of view, select three kinds of optimum support scheme scheme selected to determine suitable for the project.According to monitoring data obtained by contrast of composite soil nailing in actual control slope deformation of miscellaneous fill strong, deep foundation pit supporting structure deformation affected groundwater long side, short edge of slope deformation. Through field application proves the adverse properties of miscellaneous fill, the slope support schemes to determine the key factors influencing the scheme optimization.Based on the deep excavation slope simulation of miscellaneous fill, further validation of the miscellaneous instability soil engineering properties and supporting structure to allow deformation range to meet the safety applicability, variation.Main factors affecting the retaining structure of foundation pit were determined by orthogonal test design, determine the numerical matrix calculations of each supporting scheme weights, scheme optimization. Providing reliable theoretical basis for the practical engineering. |
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