格型钢板桩与复合地基组合式岛壁稳定性研究

结合某海上人工岛工程实例,以有限元软件PLAXIS 3D作为分析平台,建立格型钢板桩岛壁结构稳定性分析的空间弹塑性有限元模型。研究软土地基上格型钢板桩结构的变形与稳定特性,分析当格型体与多种复合地基相组合时对岛壁结构稳定性的影响。结果表明,对格型钢板桩内外土体进行地基加固后,结构稳定性均有不同程度的提高,特别是在岛内即格型体陆侧进行一定宽度高压旋喷桩的处理后,岛壁结构的稳定性大幅度提高,并能有效控制使用期人工岛的沉降量。分析成果对类似工程以及格型钢板桩结构在软土地基上的推广应用有参考意义。

Stability of cellular sheet pile quay wall structure combined with composite foundation

Based on a case of offshore artificial island engineering,we establish a spatial elastoplastic finite element model for the stability analysis of the cellular steel sheet pile structure by employing PLAXIS 3D finite element software to study the deformation and stability properties on soft foundation and analyze the influence of the composite foundation on the stability the quay wall structure.Results show that reinforcement of the soil inside and outside of the cellular sheet pile improves the structural stability to different degrees.Especially,when the jet grouting piles is constructed inside the offshore artificial island,the stability of the quay wall structure increases greatly and the maximum post-load settlement of the artificial island could be effectively controlled.The research may serve as reference for the design and application of this structure on soft foundation.