Prevention and treatment of shallow pit accidents in deep and soft soil areas
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摘要: 珠海市的锦绣四季花园及横琴新区澳门大学排洪渠两个基坑，建设场地皆处于深厚淤泥的软弱地层之上，开挖深度5 m以下，在开挖过程中先后出现工程事故。通过对上面两事故实例进行分析，发现原因虽不尽相同但均为深层滑移破坏；并利用各自场地较宽裕条件，按业主要求及时提出针对性处置措施：锦绣四季花园基坑采取放坡及坡面加固方式进行处理，澳大排洪渠则在渠内抛石反压，对墙后淤泥用塑料排水板与分层堆载预压的方式对进行处理；分层堆载在监测变形可控情况下进行，采用本身仍需填至设计标高的新增填土，较好适应工期要求。按上述处理后成功稳定了失稳基坑边坡；事后总结出几点该类工程事故预防与措施方法，供同行在设计、施工参考。Abstract: Based on two excavation of Four-season Garden in Zhuhai and the flood channel of Macao University in Hengqin New District the construction sites are both above weak foundation in deep silt with excavation depth of less than 5 meters, which have several accidents during excavation. The analyses of the above two accidents show that they are deep slip failures due to different reasons. Some suitable measures are put forward according to the owers' requirements. The excavation of Four-season Garden is sloped and reinforced, and the excavation for the flood channel of Maco University employs riprapeds and plastic drainage plates and stratification of preloading for the mud after the wall. Hierarchical load in controllable situations of monitoring deformation is adopted, which still needs to be filled to the design elevation of new filling. They result in successful stability of excavation slopes. Several points for accident prevention and measures are summarized so as to provide reference for the design and construction of similar projects.
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Keywords:
- project /
- deep and soft soil /
- shallow pit /
- cause analysis /
- accident treatment /
- preventive measure
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[1] DBJ/T 15—20—97建筑基坑支护工程技术规程[S]. 1997. (DBJ/T 15—20—97 Specification for retaining and protection in building excavation engineering[S]. 1997. (in Chinese)) [2] 张继芳. 澳门大学排洪渠设计[R]. 珠海: 湖北水利水电勘测设计院, 2011. (ZHANG Ji-fang. Flood channel design of Macao University[R]. Zhuhai: Hubei Water Resources and Hydropower Planning Survey and Design Institute, 2011. (in Chinese)) [3] GB 50497—2009 建筑基坑工程监测技术规范[S]. 2002. (GB 50497—2009 Technical code for monitoring of building excavation engineering[S]. 2002. (in Chinese)) [4] JGJ 79—2002 建筑地基处理技术规范[S]. 2002. (JGJ 79—2002 Technical code for ground treatment of buildings[S]. 2002. (in Chinese))
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