応用地質

マサ土の中の水路トンネル

森谷虎彦

1967 年 8 巻 4 号 p. 171-180
発行日: 1967/12/01
公開日: 2010/06/04

DOIhttps://doi.org/10.5110/jjseg.8.171

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The Gamagori Tunnel, wihch is one of tunnels under construction by the Aichi Irrigation Public Corporation, is a tunnel passing so-called “masa-do” an efflorescence consisting of granite, located at the end of the west main waterway of the Toyokawa Irrigation Project.
There is a layer containing under-ground water at the top. part of the tunnel. In making the location, a number of discussions were carrird out on that tunnel should be passed in this masa-do or tunneled into the hard rocks located in the north to avoid this or an open canal should be provided in the direction of the south.
As the results of various investigation, the construction was commenced after having judged to be quite safe to adopt normal construction method for excavating a tunnel into masa-do. But impossibility of progressing excavation has occured due to water flowing out with masa-do on the way of construction.
Finally, alternation of the construction method was obliged to adopt pressure construction method, its preparation now being progressed.
In this report, a consideration will be paid on in what cause was excavating a tunnel into masa-do determined and on the cause to have incured its failure.

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秩父山地の砂防ダムと地質

森川六郎, 増田重憲

1967 年 8 巻 4 号 p. 181-189
発行日: 1967/12/01
公開日: 2010/06/04

DOIhttps://doi.org/10.5110/jjseg.8.181

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Many debris barriers were constructed in the Chichibu Mountains and the distribution of these dams is closely related to geology; tectonic line, rocks and crustal movement. Dams were constructed on the Kannon yama-Tomoe gawa tectonic line which runs from northwest corner to southeast in the Tertiary System of the Chichibu basin. Almost of all dams were distributed in the crystalline schist area of the Toya upheaval mountain block, especially along the Jushi-Kunigami and the Zogahana-Asahine tectonic lines of the outsides of this block, and the drainage of the river Toki. In the Chichibu paleozoic complex they were built on schalstein and black slate along faults.

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降水量, 土壌水分, 河川水位と地下水位の関係について

沖積低地畑地帯における地下水面変動の一例

宮本昇, 相場瑞夫, 大野勝次

1967 年 8 巻 4 号 p. 191-202
発行日: 1967/12/01
公開日: 2010/06/04

DOIhttps://doi.org/10.5110/jjseg.8.191

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地下水面はいろいろな要素で昇降するが, 大河川につづく沖積低地(畑地帯)でも全般には降水の影響が支配的である。降水のうち一部は土壌により保留されるが, その量は土壌水分恒数と水分能動層の乾燥の度合を明らか・にすることによっで求められる。圃場容水量を越える降水があれば重力水となっで地下水面に達し地下水面を上昇させるが, 重力水量と地下水面上昇の比はほぼ一定であることが確かめられ, これから帯水層の有効空隙率が求められた。
河川水位は長期的季節的な変動では地下水位の最低水位を維持し, かなり広い範囲にわたっで影響を及ぼしうるが, 一降水ごとにみられる数日ないし十数日の周期での変動は河川のごく近傍の地下水面に影響を与えるのみである。

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音波探査に於ける地層の走向傾斜の測定

川崎達

1967 年 8 巻 4 号 p. 203-210
発行日: 1967/12/01
公開日: 2010/06/04

DOIhttps://doi.org/10.5110/jjseg.8.203

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The paper is concerned with the measurement of dip and strike in the sound exploration record.
The record is influenced in some physical characteristics of the sound; directinality, velocity, exaggeration.
Then, discussed that these influences should be eliminated in the analysis of the record. And finally, dip and strike is measured by two apparent dip in the cross point of observed lines, by the calculation or nomographic methods usually.
The nomographic method is convenient to measure many dip and strike.
It is also introduced in this paper, the compilation and interpretation of the nomograph and the distribution of survey lines.

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