PROCESSES OF ICE SCOUR EVENT AND CONTROL METHODS OF TEST CONDITIONS
PROCESSES OF ICE SCOUR EVENT AND CONTROL METHODS OF TEST CONDITIONS
复制标题
冰冲事件过程及试验条件控制方法
DOI：
10.2208/prooe.18.749
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
H. Saeki
中科院分区：
文献类型：
--
作者：
S. Kioka;Yoshikatu Yasunaga;Yuko Matuo;H. Saeki
除了我们之前关于冰冲事件的实验，包括中等比例的模型试验(Kioka等人，2000,2001a，b)，我们还在不同条件下进行了许多系列的模型试验。我们研究了冲刷过程的主要因素，并获得了许多结果，这是未来工作(冲刷事件的数值模拟)所需的，如下文所述。在所有情况下，冲刷深度或冲刷曲线取决于攻角。随着攻角的减小，模型龙骨由于海床和模型龙骨之间的滑动而向上移动。在简单模型中，推土力与超孔隙水压力有关，与龙骨速度的平方成正比，与渗透系数成反比，并用实验结果证明了这一关系。这些结果表明，为了进行小比例模型试验，应控制海底沙粒的粒度和龙骨的流速。然后我们考察了它的规模效应。冰冲事件是冰块与海床接触时发生的现象。据报道，冰川冲刷会损坏通信电缆和取水管道。由于(次)北冰洋近海地区的石油和天然气勘探项目越来越受欢迎，必须更加谨慎地设计和安装这些地区的石油/天然气管道，以避免因冰川冲刷而发生的事故。非常重要的是要了解机制(冰层运动、海底以下条件对冲刷事件的影响)。除了我们以前的试验，包括中等比例的模型试验(Kioka等人，2000,2001a，b)，我们还在各种条件下进行了许多系列的模型试验。我们研究了影响冲刷过程的主要因素，并获得了许多结果，为以后的工作(冰冲事件的数值模拟)提供了后文描述。我们还研究了由于孔压过大而影响冲刷过程的试验条件的控制方法，包括其尺度效应。1港口和港口工程。首页--期刊主要分类--期刊细介绍--期刊题录与文摘--期刊详细文摘内容北海道大学，日本札幌N-13 W-8，邮编060-8628
In addition to our previous experiments on ice-scour event including the medium-scale model test (Kioka et al., 2000, 2001a,b), we have performed many series of model tests under various conditions. We examined the main factors for scour-processes, and obtained many results needed for a future work (numerical simulation of scour events) as described later. In all cases, the scour depth or the scour curve depended on the attack angle. As the attack angle decreased, the model keel moved upward due to the slip between the seabed and the model keel. While we showed that the bulldozing force related to the excess pore water pressure, and it was proportional to the square of velocity of the keel and to the inverse of the coefficient of permeability from a simple model, we also proved this relationship by the experimental results. In order to conduct a small-scale model test, these results showed that the grain size of sand of seabed and the velocity of the keel should be controlled. We then examined its scale-effect. INTRODUCTION Ice-Scour Event is a phenomenon that occurs when ice comes into contact with seabed. Ice-scour has been reported to cause damage to communication cables and water intake pipelines. Since oil and natural gas exploration projects in offshore areas of (sub)arctic seas are becoming popular, more care must be taken over the design and installation of oil/gas pipelines in such areas in order to avoid accidents due to ice-scour. It will be very important to acknowledge the mechanisms (ice motions, sub-seabed conditions on scour events). In addition to our previous tests including the medium-scale model test (Kioka et al., 2000, 2001a,b), we have performed many series of model tests under various conditions. We examined the main factors for Scour-process, and obtained many results needed for a future work (numerical simulation of ice-scour event) as described later. We also examined the control methods of test conditions due to an excess pore water pressure that influences the scour-processes, including its scale-effect. 1 Port and harbor eng. division, Civil Engineering Research Institute of Hokkaido, Hiragishi 1-3-1-34, Toyohira-ku, Sapporo, 062-8602, Japan 2 MAEDA Corporation, Fujimi 2-10-26, Chiyoda-ku, Tokyo, 102-8151, Japan 3 Division of Environmental Resources Eng. Hokkaido University, N-13 W-8, Sapporo 060-8628, Japan