Development of a Methodology to Evaluate the Maximum Holding Power

开发评估最大握力的方法

• 批准号: 62460144
• 负责人: URA Tamaki
• 金额: $ 4.16万
• 依托单位: the University of Tokyo, the Institute of Industrial Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62460144/
• 关键词: Anchors; Holding Power; Acoustic Measurement; Sea Bed Soil; 強度; 反射率; 減衰率; 錨泊

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.

为了估算锚点处锚的最大抓力，提出了一种新的方法，即用海床指数H_i和锚指数H_r来估算锚点处的最大抓力。前者指标代表床的状况，可以用“探犁”来测量。后一个指数代表锚的抓力与测深犁的抓力之比。最大锚持力<max>H_<max>= H_1H_rL^3，其中L为锚的代表性锚持力。在此基础上，绘制了根岸湾海底指数图，表明海湾内最大持水能力随地点的变化是突变的。