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タイトル: 12, The Velocity of Elastic Waves in Sand
その他のタイトル: 12. 砂の中を傳播する彈性波の速度
著者: Iida, Kumizi
著者(別言語): 飯田, 汲事
発行日: 1938年3月20日
出版者: 東京帝国大学地震研究所
掲載誌情報: 東京帝国大学地震研究所彙報. 第16冊第1号, 1938.3.20, pp.131-144
抄録: We investigated the velocities of elastic waves in four kinds of sand. The relation between density and moisture content was also studied. The velocities of elastic waves in sand were obtained by means of the vibration method. Moreover, we succeeded in ascertaining the elastic wave-velocities of granular substances, such as sand, by using cellophane. It was ascertained that the elastic properties are greatly affected by the closeness of packing, the moisture content, and the presence of adherent colloidal particles in the sand. The velocities decrease with increase in moisture content or with increase in porosity. The transverse wave-velocities decrease somewhat rapidly with increase of moisture content, while the longitudinal wave-velocities of some sands increase with moisture content exceeded 19 per cent. We were thus able to observe the transitional state of sand from the ordinary solid state to the liquid state by virtue of the increasing water in the sand. The velocities through the finer grained sands seem to be greater than those through the coarse grained sands. Finally, the elastic constants of the sands were determined by the assumption that formulae similar to that of the elastic theory could be applied. These studies on the properties of granular substances are being continued, and the results will be discussed a future issue of the Bulletin. In conclusion, my sincerest thanks are due to Professor Mishio Ishimoto for his kind guidance and encouragement, and also to Dr. T. Watanabe, by whose kind guidance the mechanical analysis of the sands which were used in the present experiments was carried out.
URI: http://hdl.handle.net/2261/10373
ISSN: 00408972


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