全遮帘式板桩码头结构遮帘桩合理桩间距确定

Determination on Rational Spacing of Barrier Pile for All-covered Type of Sheet Pile Wharf

遮帘桩桩间距的确定是设计中的一个重要方面,桩间距过小,则浪费材料,经济上不合理,若桩间距过大,则土拱效应得不到良好的发挥,其遮帘效应亦不明显。在确定遮帘桩桩间距时,假定土拱厚度与遮帘桩正面及侧面宽度均有关进而确定土拱厚度,利用土拱合理拱轴线和拱脚土体破坏面的特征,通过桩间土拱静力平衡及强度控制条件得到两种条件下的桩间距计算方程,据此得出遮帘桩的合理桩间距的计算方法,并应用于全遮帘式板桩码头工程。同时,采用三维有限元数值分析确定的合理桩间距大小,与所提出方法的计算结果较为吻合,证实了该方法的可行性、合理性,其成果可供类似工程参考。

Determination of rational spacing of barrier pile is important for its design. If the pile spacing is too small, there will be waste of materials and not reasonable in economy. And if the pile spacing is too big, the soil arch effect is not obvious. In determination of the pile spacing, the soil arch thickness which was relevant with the frontal and lateral width of pile was determined according to the pile section. Then, based on the analysis of reasonable arch axis and failure surface of soil on arch foot, the static equilibrium equation and shear strength conditions of the soil arch were established and the method to determine rational spacing between adjacent piles was proposed for all-cov- ered type of sheet pile wharf. The value of rational spacing calculated by this method was close to that by 3-D finite element method. The results show that the method proposed is feasible and reasonable ; so it can be used for reference of similar projects.