不规则波作用下的群桩效应

GROUP PIIE EFFECTS UNDER IRREGULAR WAVE ACTION

本文试验研究了作用于孤立桩上的水动力系数C_D、C_M随时间(相位)的变化和四桩方阵的群桩效应问题。结果表明;用Ae—Kasily方法逐个波求解不规则波的C_D、C_M在一个周期内的均值C_D、C_M与KC数的关系和规则波的C_D、C_M、KC曲线是一致的。对于群桩效应,文中给出了群桩总力系数与KC数的关系曲线,并探讨了相对桩距l/D、波浪方向的影响。给出了群桩系数及群桩总力系数的包络线。

Based on experimental tests were conducted and the variations with time (phase) of hydrodynamic coefficient CD and CM of a single pile and the group pile effect of four-pile array are prenseted. It is shown that the relationship of averaged values in a period of CD and CM with KC number in irregular waves by Al-Kasily method is in agreement with that of CD, CM-KC-curves in regular waves. For the group pile effects, the relationship of group pile coefficient and total force coefficient of the group piles with KC number are presented. The effects of relative distances between piles l/D, wave direction on the relationship are also studied. The envelopes of group pile coefficients and the total force coefficients of group piles are given, which can be used in engineering practice.