深厚软弱土层中新型的双排钢板桩围堰结构设计

Structural Design of New Type Double Row Steel Sheet Pile Cofferdam in Deep Soft Soil Layer

在沿海地区,地质、水文条件复杂,有深厚软土层,水位深度比较大的情况下采用一般传统的双排钢板桩+钢筋拉杆进行围堰设计。研究对实际工程应用有限元分析发现,双排钢板桩在深厚软土层地区的第一道拉杆在承受拉力的同时还需承受部分轴向压力才能满足设计要求。为解决相关难题,在第一道拉杆的外圈套一个小型钢管,使第一道拉杆在承受拉力的同时也能承受部分轴向压力,同时兼顾施工方便、简单快捷、重复利用的特点,为研究奠定基础,对工程实践具有指导意义。

In coastal areas,with complex geological&hydrological conditions,deep soft soil layer&large water level depth,the general traditional double row steel sheet pile+reinforced tie rod is used for cofferdam design.Through the finite element analysis of practical engineering application,it is found that the first tie rod of double row steel sheet pile in deep soft soil layer needs to bear part of axial pressure while bearing tension to meet the design requirements.To solve this problem,a small steel pipe is sleeved on the outer ring of the first pull rod,so that the first pull rod can bear part of the axial pressure while bearing the tension,and take into account the characteristics of convenient construction,simple&fast,and reuse,so as to lay a foundation for research&guide engineering practice.