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本文介绍了基坑渗流破坏的特点及形式,针对上海某基坑边坡渗流破坏事故,分析了现场施工存在的问题并进行了模拟计算。分析认为主要原因是在未施工止水帷幕的情况下开挖基坑,并且在出现破坏前兆的情况下,仍然开挖局部深坑,从而导致了基坑边坡垮塌、内部灌水的工程事故。通过此对事故的剖析,认为以后临河深基坑设计施工应特别注意是否存在粉性土、砂性土等渗透性较高、颗粒不均匀的土层,切实做好止水措施后再进行基坑开挖,以防止发生渗流破坏事故。
In this paper, the characteristics and forms of foundation pit seepage failure are introduced. According to the seepage failure of a foundation pit slope in Shanghai, the problems existing in site construction are analyzed and simulated. The analysis shows that the main reason is that excavation of the foundation pit without the construction of a water curtain and the excavation of local deep excavations in the event of damage precursors resulted in the engineering accident of foundation pit collapse and internal irrigation. Through the analysis of the accident, we think that after the design and construction of Linhe deep foundation pit should pay special attention to whether there is soil with high permeability, sand soil and other non-uniform soil, Pit excavation to prevent the occurrence of seepage damage accident.