Study on Liquefaction Safty of Reclamation Dike in Japan

我调查了二战后日本的水域填海工程。首先，我解释了水域复垦工程的制度。其次，对这些项目进行分类，制作项目分布图。从这些结果中，发现以下几点值得报道：海岸填海工程主要集中在有明海、八津路海、濑户内海、伊势湾、三川湾和鹿儿岛湾等潮汐差较大的地区。除鹿儿岛湾外，上述项目均属冲积平原。3 .湖泊水域复垦工程几乎都分布在大型湖泊或咸淡水湖泊周围，如真司湖、中沼湖、琵琶湖、滨湖、霞aura湖、印沼湖、Teganuma湖、出云沼湖、八幡湖、jus三湖等。海岸带填海工程总量大于水域填海工程总量。但后者的总工程面积和总填海面积均大于前者。第三，利用衰减方程详细分析了围垦堤防的地震危险性。然后，我发现这些复垦堤几乎都要对其液化潜力进行研究，并提到了这些复垦堤抗震设计的基本原则。

I investigated the water area recla-mation projects in Japan after the World War II.Firstly, I explained the institution of water area reclamation projects.Secondly, I classified these projects and made the distribution maps of the projects.From these results, the following was found worthy of being reported :1.Sea coast reclamation projects are concen-trated around Ariake Sea, Yatsushiro Sea, Seto Inland Sea, Ise Bay, Mikawa Bay and Kagoshima Bay where tidal range is remarkable.2.All projects above mentioned except Kagoshima bay belong to alluvial plains.3.Water area reclamation projects at lakes are almost all distributed around large lakes or brackish water lakes, i.e.Lake Shinji, Nakaumi, Lake Biwa, Lake Hamana, Kasumigaura, Imbanuma, Teganuma, Izunuma, Hachirogata, Lake Jusan.4.The total number of the sea coast reclamation projects is more than that of the water area reclamation projects.But the total project area and the tatal reclamation area of the latter are larger than those of the former.Thirdly, I examined seismic hazard of these reclamation dikes using equations of attenuation in detail. Then, I found that these reclamation dikes were allmost all to be investigated upon their liquefaction potential and mentioned that fundamental principle of aseismatic design of these reclamation dikes.