【摘要】 基坑一旦发生破坏，会引发一系列的连锁破坏，后果严重。运用事故树分析中基本事件的结构重要度来构造层次分析法中的判断矩阵，确定组合权重，进一步将权重与灾害链中节点度联合，获得基坑发生连续破坏每一条灾害链的风险值。结果表明基坑连续破坏主要风险链为外来水渗入深度—围护结构破坏、围护结构变形量—围护结构破坏、外来水渗入深度—涌水涌砂3条链，在施工过程中要注意这方面。更多还原

【Abstract】 Once a foundation pit fails, it can trigger a series of cascading failures with severe consequences. This study applies fault tree analysis to determine the structural importance of basic events and constructs a judgment matrix within the Analytic Hierarchy Process(AHP) to determine the combined weights. These weights are then integrated with node degrees in the disaster chain to obtain the risk values for each disaster chain associated with continuous failure of the foundation pit. The results indicate that the main risk chains for continuous failure of the foundation pit are the support structure damage from infiltrating water, the support structure damage from the support structure deformation, and water and sand gushing from infiltrating water. Attention should be given to these aspects during the construction process.更多还原