Development of a Methodology to Evaluate the Maximum Holding Power

为了估算锚泊点锚杆的最大持力，提出了一种利用海床指数H_i和锚杆指数H_r两个指标来估算锚泊点锚杆最大持力的方法。“探空犁”可以测量反映床层状况的前一指标。后一指标表示锚的持力与探空犁的持力之比。最大持力H_<max>由H_<max>=H_iH_rL^3给出，其中L为锚的代表长度。为了确定这些指标，在三个地点对五种锚进行了试验。在试验的基础上，建立了根岸湾海床指数图，该图显示了海湾的最大承载能力随地点的不同而变化。

In order to estimate the maximum holding power of anchor developed at the anchoring site, a new methodology using two indexes---Sea Bed Index H_i and Anchor Index H_r---is proposed. The former index, which stands for the condition of the bed, can be measured with "Sounding Plough". The latter index stands for the ratio of holding power of an anchor to that of Sounding Plough. The maximum holding power H_<max> is given by H_<max>=H_iH_rL^3, where L is the representative lengthe of anchor.Trials on five types of anchor were carried out at three sites in order to determine these indexes. Based on the trial, a chart of Sea Bed Index in Negishi Bay is developed, which shows that the maximum holding power in a bay varies abruptly site by site.