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如何通过基坑动态实测结果优化支护方案和指导实际施工,是值得深入考虑的问题。基于广州某盾构工作井基坑的地下水位变化、支护体系力学特性及周围环境扰动等实测结果,详细分析了基坑开挖阶段地下水位下降的原因、支护体系变形规律及周边环境的受扰动情况。针对施工中围护结构变形值小的现象,提出原支护方案优化建议,且通过三维数值分析进行了验证,最终减少了一道钢支撑,较好地反映了动态设计与信息化施工的理念,确保了工程建设的可行性和经济性。
How to optimize the support plan and guide the actual construction through the dynamic actual test results of the foundation pit is a question that deserves further consideration. Based on the measured groundwater level changes, the mechanical properties of support system and the perturbation of surrounding environment in a certain shield work well in Guangzhou, the causes of the descent of groundwater level during excavation are analyzed in detail. The deformation rules of support system and the surrounding environment Disturbed. In view of the small deformation value of the retaining structure during construction, the optimization proposal of the original support scheme is proposed and verified by three-dimensional numerical analysis. Finally, the steel support is reduced, which reflects the concept of dynamic design and information construction well, To ensure the feasibility of construction and economy.