【摘要】 当深厚淤泥层中的双排钢板桩未完全穿透淤泥层时，围堰整体结构易产生显著变形，其稳定性与安全性需重点关注。本研究采用有限元方法对双排钢板桩围堰进行安全性与稳定性仿真分析，重点考察钢板桩外侧模袋铺设及内侧回填土性质对围堰整体安全性的影响。研究表明：在不同挡水工况下，钢板桩受力均能满足材料强度要求；当钢板桩外侧铺设单层模袋且处于单侧挡水工况时，围堰整体稳定安全系数低于规范限值；当模袋增至双层时，围堰整体变形量减小，稳定性可满足规范要求。此外，研究发现回填土黏聚力和内摩擦角的变化对围堰整体稳定性影响较小。本研究结果可为类似地质条件下的钢板桩围堰工程设计提供参考依据。更多还原

【Abstract】 When double-row steel sheet piles in deep silt layers do not fully penetrate the silt layer, the overall cofferdam structure is prone to significant deformation, and its stability and safety require focused attention. This paper conducts a finite element simulation to analyze the safety and stability of double-row steel sheet pile cofferdam, with emphasis on the influence of exterior geotextile(mattress bag) placement and the properties of interior backfill soil. The results show that under various water-blocking conditions, the stress within the steel sheet piles remains within material strength limits. However, under single-layer mattress placement and unidirectional water pressure, the overall stability safety factor of the cofferdam falls below the code-specified threshold. When the mattress layer is increased to a double layer, the overall deformation decreases, and stability meets regulatory standards. Additionally, variations in the cohesion and internal friction angle of the backfill soil were found to have minimal effect on overall cofferdam stability. The findings provide valuable reference for the design of sheet pile cofferdams under similar geological conditions.更多还原