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（山東建筑工程學(xué)院土木工程學(xué)院  濟(jì)南 250014）
【提要】  針對(duì)某懸臂支護(hù)基坑事故的設(shè)計(jì)和施工過(guò)程，從基坑支護(hù)型式和設(shè)計(jì)計(jì)算、施工方法、施工順序、地下水等方面進(jìn)行分析，指出該基坑在控制位移上選用支護(hù)型式、考慮相鄰環(huán)境影響、施工方法及順序等方面存在的問(wèn)題。經(jīng)詳細(xì)考慮諸多因素和該工程現(xiàn)狀，確定從減輕懸臂樁支護(hù)的后方壓力和減輕支護(hù)變形兩方面解決，提出了采用基坑外降低部分水位，同時(shí)在懸臂樁上加預(yù)應(yīng)力錨拉的加固處理方案，取得了較好的效果。
【關(guān)鍵詞】  懸臂式支護(hù)  邊坡位移  事故  預(yù)應(yīng)力錨桿  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