深厚淤泥中双排钢板桩结构安全稳定性研究

针对滨海地区深厚淤泥地基中双排钢板桩围堰结构受力复杂的问题,基于土力学理论,分别从运行工况下的抗剪切变形稳定、底部抗隆稳定、整体抗滑移稳定、抗倾覆稳定以及整体滑动稳定等方面进行分析,给出了安全稳定计算公式,同时通过数学理论推导计算,给出了钢板桩最小入土深度计算公式。以浙江省某大型围垦工程水闸的双排钢板桩围堰工程为例,依据该计算公式,得出最小入土深度建议值为17.01 m,与工程实际设计值18.50 m基本一致;同时利用有限元计算软件,对该工程中双排钢板桩围堰结构进行数值模拟计算分析,并将模拟结果与钢板桩实际水平变位监测资料进行对比分析,认为该双排钢板桩围堰结构设计安全可靠,可为相关工程应用提供参考。

Research of safety and stability of double-row steel sheet pile structure in deep silt

Aiming at the complicated calculation of the double-row steel sheet pile cofferdam structure in deep silt foundation, the calculation formula of safety and stability was obtained from the aspects of anti-shear deformation stability, bottom heave-resistant stability, overall anti-sliding stability, anti-overturning stability and overall sliding stability under operating conditions based on the soil mechanics theory. In addition the minimum penetration depth of the steel sheet pile was given with mathematical theory. Taking a double-row steel sheet pile cofferdam project in Zhejiang Province as an example, according to the calculation formula proposed in the present paper, the recommended value of the minimum penetration depth is 17. 01m, which is basically consistent with the actual design value of 18. 50 m. Numerical simulation based on FEM was also performed and the calculated data of the double-row steel sheet pile was closer to the measured value. Comparison with actual horizontal displacement data shows that the double-row steel sheet pile cofferdam structure design is reasonable and reliable, providing reference for related engineering applications.