摘要
在设计单排钢板桩围堰时如果不设拉撑结构,设计成悬臂式钢板桩围堰,将导致钢板桩在软土地基中变形量大,甚至发生倾覆。基于华南地区某船闸工程实例,利用有限元软件建立三维可视化地质模型计算分析了施工垫层、搅拌桩施工时对地基土扰动和产生的超静孔隙水压力等因素对钢板桩围堰变形及受力的影响。由于当地软土具有压缩性高、抗剪强度低、固结时间长、灵敏度高、扰动性大等性质,深厚软土搅拌桩连续施工过程中存在土体强度因扰动降低的时段,施工荷载、水压力、土压力等综合因素作用导致钢板桩围堰产生大变形。结合监测数据及专家意见,提出围堰变形预警控制及加固措施。
Based on an example of a ship lock project in South China,the 3D visualization geological model is established by finite element software and the influence of the soil disturbance and the excess pore water pressure on the deformation and stress of the steel sheet pile cofferdam in the construction of the cushion and the mixing pile is analyzed. Because the soft soil has the characteristics of high compressibility,low shear strength,long consolidation time,high sensitivity and large disturbance,the strength of soil decreases first during the continuous construction of mixing pile.Comprehensive factors such as construction load,water pressure and earth pressure are the main causes leading to the large deformation of steel sheet pile cofferdam.Based on monitoring data and expert opinions,the warning control and reinforcement measures are proposed.
作者
杨昌斌
高超
王勇
YANG Chang-bin;GAO Chao;WANG Yong(The Second Engineering Company of CCCC4 Harbor Engineering Co.Ltd,Guangzhou 512030,China)
出处
《中国农村水利水电》
北大核心
2018年第9期171-175,共5页
China Rural Water and Hydropower
关键词
软土地基
钢板桩围堰
大变形
三维可视化地质模型
搅拌桩
soft soil foundation
steel sheet pile cofferdam
large deformation
3D visualization geological model
mixing pile
