权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on the Process of Damage Gentle-Slope Sea Dike Attacked Severe Wave for Hours Together of Irregular Waves

不规则波浪持续数小时猛烈波浪侵袭缓坡海堤破坏过程研究

基本信息

批准号：
10650512
负责人：
TAKAHASHI Toshihiko
金额：
$ 0.64万
依托单位：
Tohoku Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650512/
关键词：
Gentle-slope sea dike damage irregular wave severe wave experiment beach profile change 波の打ち上げ高さ現地観測被覆ブロック

项目摘要

○ Comparison of the Beach Profile Changes in front of Gentle-Slope Sea Dike for Regular and Irregular WavesBeach profile changes in front of the gentle-slope sea dike and the damage of dike with them were studied experimentally by using the regular and irregular waves. Beach profile changes caused by irregular wave becomes smaller than that by regular wave. It will be considered that the beach profile changes are smoothed in general, because the wave breaking point for irregular wave is different every one wave. In the case of regular wave, although the damage of dike progresses gradually as a time of wave action becomes longer, the damage becomes early with increasing dike slope. On the other, in the case of irregular wave, the damage of dike did not occur within the limits of this experiment.○ Experiments on the Damage of Gentle-Slope Sea Dike Caused by the Piping of Back filling MaterialsThe experimental investigation on the piping of back filling materials which is considered as a cause for damage of gentle-slope sea dike was carried out. The sands or gravels of 5 different grain sizes were used for the back filling materials. From the experiments, two different patterns of damage were observed. One is a damage caused by the piping from the hole of upper blocks than the still water level and another one by the piping from the end of slope after erosion of foundation works. The former occurred for small grain size of back filling materials.

○规则波和不规则波作用下缓坡海堤前海滩剖面变化的比较采用规则波和不规则波，对缓坡海堤前海滩剖面变化及其对海堤的破坏进行了试验研究。不规则波引起的海滩剖面变化小于规则波引起的海滩剖面变化。一般认为海滩剖面的变化是平滑的，因为不规则波的破波点在每一个波上都是不同的。在规则波作用下，虽然随着波浪作用时间的延长，堤坝的破坏逐渐发展，但随着堤坝坡度的增加，堤坝的破坏提前。另一方面，在不规则波的情况下，在本试验的范围内，堤防不会发生破坏。○回填材料管涌对缓坡海堤的破坏试验对被认为是缓坡海堤破坏原因之一的回填材料管涌进行了试验研究。回填材料选用5种不同粒径的砂或砾石。从实验中，观察到两种不同的损伤模式。一种是上部块体孔位高于静水面的管涌造成的破坏，另一种是基础工程侵蚀后坡端管涌造成的破坏。前者发生在小粒径的回填材料。