摘要
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。
The characteristics and forms of seepage failure of foundation pits are introduced in the paper. The problems in construction process are analyzed by simulation method for a foundation pit slope seepage failure accident near a river in Shanghai. The main reason is that the foundation pit is excavated without water cut-off curtain, and locally deep excavation is continuous in the case of the collapse signs appear. The excavation resulted in the pit slope collapsed and water flow into the pit. According to the analysis, close attention should be paid to the deep excavation design and construction when the pit is near river and there are high permeability and uneven grained soils. Water cut-off curtain must be constructed prior to excavation to prevent seepage accident.
作者
鹿存亮
Lu Cunliang(Shanghai Geotechnical Investigation ＆ Design Institute Co. , Ltd. , 200070 Shanghai, Chin)
出处
《工程勘察》
2017年第6期19-23,共5页
Geotechnical Investigation & Surveying
关键词
临河基坑
渗流破坏
事故分析
foundation pit near river
seepage failure
cause analysis
