软土地基双排钢板桩围堰稳定性分析及应用.pdf

2017年1月上 施工技术 第46卷第1期 CONSTRUCTION TECHNOLOGY 13 D0I:10.7672/sgjs2017010013 软土地基双排钢板桩围堰稳定性分析及应用 徐顺平，戴小松，张安政，谢学彬，严浩明 (中建三局投资发展有限公司，湖北武汉430076) [摘要]双排钢板柱围堰由于结构不设内支撑，在软土地基中变形量大，易发生倾覆.基于东湖通道围堰工程实 例，对双排钢板桩围堰“前短后长”和“前长后短”两种结构形式变形特性分析和探讨，分析软土地基双排钢板柱围 堰在5种不同抽水速率工况下变形及受力情况.结果表明，围堰在抽水阶段，“前长后短”结构形式位移变形小于 “前短后长”.结合监测数据及专家意见，提出0.2m/d抽水速率指标以及三级变形监测预警控制值，确保围堰 安全. [关键词]地基；软土；钢板桩围堰；稳定性；变形；监测 [中图分类号]TU443 [文献标识码]A [文章编号]1002-8498(2017)01-0013-05 Analysis and Application of Double Row Steel Sheet Pile Cofferdam Stability on Soft Soil Foundation Xu Shunping Dai Xiaosong Zhang Anzheng Xie Xuebin Yan Haoming Investment Development Corporation of CCTEB.Wuhan Hubei 430076 China) Abstract:Because of the double row steel sheet pile structure without support it is summarized as large deformation in soft soil foundation and easy to overturn.Based on Eastlake Tunnel cofferdam engineering this paper discussed two kinds of structure type deformation characteristics as 'short after long'and 'long after short'of the double row steel sheet pile cofferdam.Using elastic plastic constitutive model the authors make analysis on soft soil foundation of double row steel sheet pile cofferdam in five different pumping rate under the condition of deformation and stress.The results show that cofferdam in the pumping stage ‘before long short'structure type displacement deformation is smaller than the‘long and short in front'.Combined with the monitoring data and expert opinion the 0.2m/d pumping rate index and the thre...