由某工程事故谈地下室抗浮问题

Reflections on anti-floating design of basements based on an engineering accident

针对南京某小区单建式地下室上浮导致部分钢筋混凝土柱产生剪切压弯破坏现象,进行现场勘测及事故原因分析,指出设计及施工中存在如下问题:1)进行抗浮设计时未留足够的安全余量;2)施工单位对地下水对工程影响的严重性认识不足,未按设计要求施工;3)监理单位对地下水对工程影响的严重性认识不足,未起到监督施工单位按设计要求施工的作用。介绍了透水泄压、周边集水井降水等现场应急处理方案及后续的加固方法。经加固处理后该地下室已投入正常使用,至今状态良好,表明所采取的措施起到了预期的效果。

An up-floating accident in a separate basement happened in a community in Nanjing, which caused the shear buckling destruction in some concrete columns. Site survey was conducted and the cause of the accident was analyzed. Problems in design and construction were pointed out as follows： 1） safety allowance is inadequate during the anti-floating design ; 2） the construction unit is failed to appreciate the seriousness of groundwater effects on engineering and failed to construct according to design requirements; 3） supervision units are failed to appreciate the seriousness of groundwater effects on engineering and failed to play the role of supervision on construction units according to the design requirements. On-site emergency plans and reinforcement methods were also introduced as permeable pressure relief and peripheral sump dewatering. According to the above methods, the basement has been put into normal use after reinforcement and is still in good condition, which shows that the measures adopted achieve expected effects.