Study on Safety Design Methods of Parallel Support Systems for Deep Foundation Excavation
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摘要: 为解决深基坑中并联支撑体系服役安全使用问题,分析了深基坑并联支撑体系中混凝土支撑受力破坏模式,以郑州市地铁站8号线小营站基坑工程为研究对象,基于结构可靠度分析理论和失效概率论,建立了深基坑并联支撑体系安全状态模型,同时对混凝土支撑设计进行"去心优化"处理,解决混凝土支撑实测值远超理论值的问题。结合原位试验表明:影响并联支撑体系失效概率的因素与该支撑体系中概率权重较大的支撑有关;"去心优化"后的大、小混凝土支撑截面材料使用量分别降低约8.5%和11.9%,较大程度地节约了施工成本。Abstract: In order to solve the problem of service safety of parallel support systems in deep foundation excavation, the failure mode of concrete supports in parallel support systems in deep excavation engineering was analyzed. Taking the deep excavation project of Xiaoying Station in Zhengzhou Metro Line 8 as the object, based on the structural reliability analysis theory and failure probability theory, the safety state model of parallel support systems in deep excavation was constructed, and the design of concrete supports was "optimized by decore". The problem that measured values of concrete supports were far beyond theoretical values was effectively solved. Combined with the in-situ experiments, it was indicated that the factors influencing the failure probability of parallel support systems were related to supports with higher probability weight in support systems. A number of materials used in larger and smaller concrete support sections after decore optimization was reduced by about 8.5% and 11.9% respectively, and the construction cost was greatly saved.
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