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Volume 35 Issue zk1
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XUE Li-ying, YANG Wen-sheng, LI Rong-nian. Discussion and analysis of accident reasons of deep foundation pits[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(zk1): 468-473.
Citation: XUE Li-ying, YANG Wen-sheng, LI Rong-nian. Discussion and analysis of accident reasons of deep foundation pits[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(zk1): 468-473.
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Discussion and analysis of accident reasons of deep foundation pits

  • 1. Institutute of Foundation Engineering, China Academy of Building Research, Beijing 100013, China; 2. State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China; 3. Beijing traffic vocational technical college road &bridge department, Beijing 102200, China

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  • Received Date: March 01, 2013
  • Published Date: July 18, 2013
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  • The characteristics and modes of failure of deep foundation pits are introduced. The internal factors of accident reason are discussed. For the accident of subway foundation ditch, the existing problems in the design, construction and monitoring are analyzed. The main reasons of the accident are that the shear-resistance rungs are not installed according to the design requirements between steel wailings and soldier piles, resulting in that the joints between steel wailings and soldier piles cannot support effectively the tangential component force of axial force of diagonal bracings, and the sliding friction between steel wailings and side wall of ditch is aroused, so the structural supports lose bearing capacity. The diagonal bracings and corbels are not welded according to the design requirements. The mechanism of load-carrying of support system in the direction of gravity changes essentially, as a result, without effective anti-sliding constraints, the steel wailings exhibit overturning and unstability, and one end of the steel diagonal bracings falls freely. Deep foundation pits should enhance the process management and control of construction quality, related parties should enhance intercommunication, and construction units should grasp the main design intention and the key design link. The unusual underlying reasons of monitoring data should be comprehensively analyzed, and specific emergency measures should be proposed.Key words: deep foundation pit; damage of foundation pit; engineering accident; monitoring
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  • GB50497—2009 建筑基坑工程监测技术规范[S]GB50497—2009 建筑基坑工程监测技术规范[S].北京:中国计划出版社, 2009.(GB50497—2009 Technical code for monitoring of building excavation engineering[S](GB50497—2009 Technical code for monitoring of building excavation engineering[S].Beijing:China Planning Press, 2009. (in Chinese))
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    JGJ120—99 建筑基坑支护技术规程[S]JGJ120—99 建筑基坑支护技术规程[S].北京:中国建筑工业出版社, 1999.(JGJ120—99 Technical specification for retainingprotection of building foundation excavations[S](JGJ120—99 Technical specification for retaining and protection of building foundation excavations[S].Beijing:China Architecture & Building Press, 1999. (in Chinese))
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