（山东建筑工程学院土木工程学院  济南 250014）
【提要】  针对某悬臂支护基坑事故的设计和施工过程，从基坑支护型式和设计计算、施工方法、施工顺序、地下水等方面进行分析，指出该基坑在控制位移上选用支护型式、考虑相邻环境影响、施工方法及顺序等方面存在的问题。经详细考虑诸多因素和该工程现状，确定从减轻悬臂桩支护的后方压力和减轻支护变形两方面解决，提出了采用基坑外降低部分水位，同时在悬臂桩上加预应力锚拉的加固处理方案，取得了较好的效果。
【关键词】  悬臂式支护  边坡位移  事故  预应力锚杆  加固
Analysis and Reinforcing Measure of a Cantilever Timbering Accident of Excavation/Chen Qihui,  Sun Jianping,  Guo Qiuying(Shandong Institute of Architecture and Engineering,  Jinan  250014,China)
Abstract:Aiming at design and construction process of a cantilever timbering accident, support type and calculation, construction method, construction process and underground water are analyzed.The problems which exist in support type  choosen in the displacement control aspect,the nearby condition influence and construction are pointed out. By analyzing these factors and actual project, these problems can be solved by reducing power and deformation of cantilever timbering.The method of reinforcement using lowering underground partial water in outer pit and adopting prestressed anchor on cantilever timbering is put forward.The results show that the support effect is satisfying, and excavati
on safety is insured.
Keywords:cantilever timbering; slope displacement; accident; prestressed anchor; reinforcement