巻号一覧
12 巻 (1959)
- 4 号 p. 149-
- 3 号 p. 91-
- 2 号 p. 45-
- 1 号 p. 1-
前身誌
12 巻, 2 号
選択された号の論文の7件中1～7を表示しています
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松島 昭吾1959 年 12 巻 2 号 p. 45-48
発行日: 1959/06/30
公開日: 2010/03/11
ジャーナル フリーCreep of granite under compressional force was very accurately measured in the longitudinal and lateral direction with an electrical resistance strain gauge up to a time duration of 2, 000, 000 seconds.
The empirical equations connecting creep strain and time are
s=A+A1e-α1t+A2e-α2t+A3e-α3t+Blogt+Ct
for the longitudinal direction, and
s=A+Blogt+Ct
for the lateral direction. The former is more or less unduratory and the later rectilinear.
In some cases, specimens ruptured in creeping. The creep curve for granite has three stages like those for ordinary materials, but, the curve has distinct discontinuities caused by micro cracks, and in the final stage, rupture starts from the cracks which occur one after another.抄録全体を表示PDF形式でダウンロード (339K) -
小林 直太1959 年 12 巻 2 号 p. 49-60
発行日: 1959/06/30
公開日: 2010/03/11
ジャーナル フリーAs a continuation to the previous paper, wave generations from a distortional line source within the ground are studied. For a distortional origin which is of step function type in time, the displacements at several points in the ground are calculated. In contrast with the surface displacements, no displacement corresponding to the Rayleigh wave appears at deep points in the ground while three distinct pulses corresponding to the direct S, reflected S and reflected P do so.
Wave profiles at the surface are also calculated for an implosive origin. Generation mechanism of Rayleigh wave for a distortional origin is like that for a dilatational origin.抄録全体を表示PDF形式でダウンロード (888K) -
佐藤 泰夫, 山口 林造1959 年 12 巻 2 号 p. 61-67
発行日: 1959/06/30
公開日: 2010/03/11
ジャーナル フリーThe derivation of the velocity equations of surface waves propagating in multi-layered structure is not hard in its principle. However, the practical computation is extremely complicated when there are many layers. To remove this difficulty, several methods have been suggested, which are all connected with the problems involving P and SV waves. If we put μ=0 into these calculations, the solutions turn out to be those of sound waves in liquid, and by an appropriate change of variables the solution for Love waves is obtained. In this paper, however, a simpler and a more direct method having a clear physical meaning is presented.
We start from the solution in the uppermost layer. Adopting the solution satisfying the condition of the free surface we can obtain the displacement and the stress at the surface of separation between this and the next layer. Two boundary conditions, continuity of displacement and stress, give the solution in the next layer. Repeating the process for each of the layers we can finally obtain the solution in the last medium, namely the semi-infinite medium. This solution must converge at the point of infinite depth, and this condition gives the velocity equation of this case.
By a small modification of expressions we can easily obtain the equation for the problem of a liquid medium as well as the solutions with or without semi-infinite half space.
The problem of sound waves in liquid medium can be at once solved by modifying the above theory using the change of physical quantities given in Table 1.抄録全体を表示PDF形式でダウンロード (521K) -
2,000kg/cm2までの高圧下における花嵩岩の変形と破壊松島 昭吾1959 年 12 巻 2 号 p. 68-74
発行日: 1959/06/30
公開日: 2010/03/11
ジャーナル フリーIn previous experiments, we observed that granite increases in volume near and in the fracture range in simple compression. This volume increase diminishes as the confining pressure is increases. Under 1800atm. confining pressure, the rock becomes rearly elastic and breaks down showing high brittleness. The bulk expansion is very much reduced. These phenomena are considered to be in a close connection with the porosity of rocks. An extraordinary increase in rupture strength with confining pressure was observed. The observed value of rupture strength is in a good agreement with Robertson's formura σD=6PH for sillicate rocks.抄録全体を表示PDF形式でダウンロード (612K) -
飯田 汲事, 青木 治三1959 年 12 巻 2 号 p. 75-81
発行日: 1959/06/30
公開日: 2010/03/11
ジャーナル フリーSome phases in the preliminary tremors of seismograms recorded at Nagoya and Gifu are investigated. The seismograms of the aftershocks following the Mikawa earthquake of 1945 were used. The phases obtained are explained as due to P2 S1 waves which were investigated by Matuzawa and others for Kwanto district.
The existence of two distinct phases, denoted by P1 and P2, is recognized in the seismograms recorded at Nagoya. The first phase P1 is independent of the duration of preliminary tremors (τ), while the second phase P2 is more or less related to it. The times from the commencement of the phase P to each of these phases, P1 and P2 are as follows;
P1=0.46sec, P2=0.053τ+1.417sec.
On the other hand, we can recognize the existence of only one distinct phase in the seismograms recorded at Gifu. The time from P to this phase is independent of the duration of preliminary tremors and
P2=1.48sec.
From these data, the upper crustal structure in Nagoya district was discussed.抄録全体を表示PDF形式でダウンロード (612K) -
飯田 汲事, 青木 治三1959 年 12 巻 2 号 p. 82-83
発行日: 1959/06/30
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (214K) -
片岡 明雄, 小栗 幹男1959 年 12 巻 2 号 p. 83-85
発行日: 1959/06/30
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (320K)
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