Journal of the Mining Institute of Japan

THE FUNDAMENTAL THEORY AND PRACTICAL APPLICATION OF SEISMIC PROSPECTING METHOD

H. AOYAMA, S. HAENO, M. ISHIZAKI, I. MIKAWA

1933 Volume 49 Issue 575 Pages 131-146
Published: March 22, 1933
Released on J-STAGE: July 13, 2011

DOIhttps://doi.org/10.11508/shigentosozai1885.49.131

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First, we explained the fundamental theory of seismic prospecting on the stand point of the actual utilization, as the properties of the earth elastic waves and the propagation paths of them in the subsurface of earth, and then the methods of detecting these short periodic elastic waves which caused by the artificial earthquakes. Next, we described the recent result of seismic prospecting which we have carried out at near Akabane, Tokyo by the new invented seismometer.

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EARTH PRESSURE ON THE BOUNDARY OF A HORIZONTAL ELLIPTIC TUNNEL

T. SUGIHARA

1933 Volume 49 Issue 575 Pages 147-164
Published: March 22, 1933
Released on J-STAGE: July 13, 2011

DOIhttps://doi.org/10.11508/shigentosozai1885.49.147

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Study of the earth pressure in rock around or on the boundary of an elliptic tunnel is one of the important problems in mining and civil engineering as well as a circular tunnel. So far as the author is aware, however, this problem has not yet been solved theoretically, therefore he has dealt with the present problem, assuming the earth crust is a semi-infinite elastic solid body and an elliptic tunnel whose major and minor axes are 2aand 2blong respectively and depthξ, is excavated horizontally.
The results obtained are as follows;
1. Elliptic boundary of the tunnel is given byα=α₀of the series of curves, which are introduced by the relations
x=cchαCOSβ, y=cShαsinβ, a=cchα₀, b=cshα₀,
xandybeing vertical upward and horizontal axes.
Stress at the apex of the tunnel, i.e., at the upper end of major axis, is given by
ββ= {-σ/1-σ}ρyξ+ {1/1-σ(1+a/b)-1/2 (1-σ)}ρga
at the side wall, i.e., at the end of minor axis,
ββ= {σ/1-σ(1+2b/a)}ρgξ
at the bottom,
ββ{-σ/1-σ(1+2a/b) +1}ρgξ-{1/1-σ(1+a/b)-1/2 (1-σ)}ρga;whereββis stress tangential to the boundary and positive sign represents tension, negative sign compression, ρis densityσPoisson's ratio of the earth crust, g gravity.
2. Whereξ>>a, andσ=1/4, as in the ordinary case, stress on the, boundary is of negative sign everywhere, i. e., compression, and its maximum value exists at the end of minor axis provideda<3b.
3. Wherea=b, this is the case of circular tunnel.

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MINING AND REFINARY OF NICKEL AND MONEL METAL

T. FUJIWARA

1933 Volume 49 Issue 575 Pages 165-169
Published: March 22, 1933
Released on J-STAGE: July 13, 2011

DOIhttps://doi.org/10.11508/shigentosozai1885.49.165

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The use of nickel has been largely limited to the nickel steel industry but since the discovery of new application of nickel for improving the properties of cast iron, the demand for nickel has greatly increased.
Monel metal is also now being used not only as an acid and corrosion resistant alloy but for architectural supplies and household utensiles.
I wish to describe here briefly the origin of nickel are and its smelting process of the sulphide are produced at a Canadian Mine.
The smelting processes of Nickel are classified roughly as follows:
(1) Orford Process.
(2) Mond Process.
(3) Hybinette Process.
In this report, the outline of the above methods is described together with the fact that the monel metal is smelted as a natural alloy from the Canadian are by the Orford Process.

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[title in Japanese]

1933 Volume 49 Issue 575 Pages 170-178
Published: March 22, 1933
Released on J-STAGE: July 13, 2011

DOIhttps://doi.org/10.11508/shigentosozai1885.49.170

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