巻号一覧
6 巻 (1965)
- 4 号 p. 189-
- 3 号 p. 135-
- 2 号 p. 69-
- 1 号 p. 1-
6 巻, 3 号
選択された号の論文の3件中1～3を表示しています
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岩塚 守公1965 年 6 巻 3 号 p. 135-144
発行日: 1965/09/01
公開日: 2010/06/04
ジャーナル フリーThe group of Buddhist stone images of Oya Hill which is in the suburbs of Utsunomiya City is the oldest one among cave statures in Japan (made in the 9th century). The stone images are carved on the wall surface of the large cave in porous green tuff.
At the present time, the stone images are considerably damaged as a result of active weathering through the centuries.
So the National Commission for Protection of Cultural Properties is intending to repair the damage and to check further deterioration.
The author has made clear that the active weathering is caused by capillary water which derived from the ground water, and has found that the elimination of the ground water is effective for the conservation of the stone images.抄録全体を表示PDF形式でダウンロード (1641K) -
主としてカルスト泉の水理地質について清水 欣一1965 年 6 巻 3 号 p. 145-157
発行日: 1965/09/01
公開日: 2010/08/24
ジャーナル フリーFor the research of apparent unit area discharge of spring, trial calculations were carried out on the Karst-spring resources in Kusama and Nariwa plateaus. The results are as follows:
Karst region
Kusamaplateau, north part 1.33 4.2 480
Kusamaplateau, south part 1.04 16.3 1, 500
Nariwa plateau 4.7 0.256 108
Apparent unit area discharge of spring, Z can be expressed by the following formula:
where Q is discharge average of springs, A is the area of same hydro-geologic condition and n is the number of springs in that area. Values of Z in Karst region and the north-west area of Mt. Daisen volcano are plotted against corresponding values of Q on the logarithmic paper. The result is as shown in Fig. 9. Plotted points are distributed on a linear zone. This fact suggests the availability of the conception of “apparent unit area discharge of spring” in the comparison of spring resources.
The author asserts to be of importance to calculate the unit area discharge Z for the evaluation of spring resources by hydrogeological survey for the exploitation and further development of fissure water resources.抄録全体を表示PDF形式でダウンロード (1156K) -
結晶片岩, 泥岩, 花崗岩小林 芳正, 飯塚 全, 熊谷 兼雄1965 年 6 巻 3 号 p. 159-181
発行日: 1965/09/01
公開日: 2010/06/04
ジャーナル フリーThe strength of a rock in situ essentially differs from that of a rock of laboratory size. Experiments were undertaken to show the difference.
It was presumed that the rock in situ is weaker than the rock specimen, since the former contains many weak planes, and the experiments were prepared mainly to abtain the shear strength of the rock in situ along a weak plane.
The crystalline sandstone-schist of Shikoku, the alternation of mudstone and sandy tuff or tuffaceous sandstone of Miocene (in Yamagata Prefecture) and the granite along Tenryu River were taken up as the objects.
Assuming that the shear strengths of these might be expressed as a sum of the cohesion and the friction, results were as follows.
sandstone-schist;τ=n
alternation of mudstone and sandstone;τ=0.5-1.0+0.3n
granite;τ=0.5-1.0+0.6n, where τ is the shear strength and n the normal stress on the sheared plane expressed in t/m2. The areas of sheared planes were 0.2-2m2.
To check the reliability of results the strength obtained by experiments for the mudstone of Miocene was compared with that which was estimated by the rock failure at Kobato Apl. 27. 1957. It was found that the former was as large as about twice of the latter.
The reasons of the difference might be 1), the deviation of the strengths of the rock at various points around the mean value of them, 2) the deterioration of test pieces during shaping, 3) the error in calculation of the failure or 4) the essential difference of the mechanism of rock failure in various cases.
Accordingly, the results must be carefully applied in the practice and the mechanism of rock failure should be studied further. Especially, the process of the failure at various parts of a test piece should be observed to clarify the mechanism.抄録全体を表示PDF形式でダウンロード (2285K)
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