深基坑并联支撑体系安全设计方法研究  

Study on Safety Design Methods of Parallel Support Systems for Deep Foundation Excavation

作　　者：谢高见 肖昭然[1] 张文萃 李志强 XIE Gaojian;XIAO Zhaoran;ZHANG Wencui;LI Zhiqiang(School of Civil Engineering,Henan University of Technology,Zhengzhou 450052,China;Guangxi Yicheng Blueprint Technology Co.,Ltd.,Nanning 530002,China)

机构地区：[1]河南工业大学土木工程学院,郑州450052 [2]广西易城蓝图科技有限公司,南宁530002

出　　处：《工业建筑》2023年第4期136-140,共5页Industrial Construction

基　　金：河南省教委自然科学基金项目(16A560003)。

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。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 insitu 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.

关 键 词：并联支撑体系 结构可靠度分析 失效概率 安全水平 使用状态 去心优化 

分 类 号：TU753[建筑科学—建筑技术科学]