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タイトル: 13. 東京に於ける地盤沈下の研究VII : 昭和17年水準改測の結果
その他のタイトル: 13. Studies in the Sinking in Tokyo. VII. : Results of Relevelling in 1942
著者: 宮部, 直巳
福西, 淸治
著者(別言語): Miyabe, Naomi
Hukunishi, Seizi
発行日: 1944年8月15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21冊第3/4号, 1944.8.15, pp.336-348
抄録: In order to study the recent stage of the phenomenon of subsidence of the ground surface in Tokyo, the heights of more than 300 bench-marks distributed in Tokyo were measured by level in 1942, and their vertical displacements during 1940-1942 were worked out. Comparing the recent results with those measured in 1940, it was noticed that the region where the ground surface had subsided conspicuously seemed to have migrated eastwards. The variation in the subsidence velocity of several bench-marks were also studied. The subsidence velocity seems to vary as given by a following simple expression u=u_0c^<+h(t_0-t)> for t_0>t, u=u_0e^-h(t-t_0)> for t>t_0, rather than that as given by u=u_0e^<-h(t-t_0)^2> which was adopted in the previous reports as an appropriate expression for the variation of subsidence velocity. The values of constants u_0 and h for various bench-marks were obtained. The expressions of the subsidence velocity as cited above are given tentatively for convenience's sake in estimating the amount of subsidence. The formal difference in the mathematical expressions between the two is not essential. In boring in Koto region, the percussion number for every lm decent of the boring head was counted which may represent approximately the compactness of the soil layers. This fact may lead to the conclusion that the measured vertical displacements are due to the integrated effect of the shrinkage of layers of soft soil intervening the layers of relatively hard soil.
URI: http://hdl.handle.net/2261/10597
ISSN: 00408972


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