著者

大島 洋志

出版者

Japan Society of Engineering Geology

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.45, no.4, pp.197-209, 2004-10-10 (Released:2010-02-23)

参考文献数

13

被引用文献数

1 1

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筆者は長年, 鉄道の地質技術者として主に鉄道トンネルの路線計画や設計・施工計画にかかわってきた. 本稿は, 筆者が体験してきたことがらのうち, トンネルの路線選定を対象に, 一地質技術者としてどのような点に留意してきたかを, 事例を交えながら随想風にまとめたものである.

著者

大島 洋志

出版者

公益社団法人 日本地下水学会

雑誌

地下水学会誌 (ISSN:09134182)

巻号頁・発行日

vol.62, no.2, pp.257-281, 2020-05-28 (Released:2020-08-21)

参考文献数

36

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筆者は,当時の国鉄に就職し,鉄道技術研究所地質研究室に配属されて以来,これまで55年以上に渡って山岳トンネル,とくに地下水が関わる様々な問題の解決に携わってきた。日本地下水学会誌の特集号に論文を投稿する機会を得たことから,筆者の知見の集大成として,トンネルと地下水に関してこれまでに学んだことを事例とともに紹介する。トンネル内に湧出する地下水を「トンネル湧水」と呼ぶ。論文では,まず,「トンネル湧水のイロハ」として,トンネル湧水の処理および区分,トンネル恒常湧水量の考え方や経緯,トンネル工事の難易は湧水と地圧で決まる理由を事例とともに概説する。そして,「トンネルと地下水との関係について調査・研究したこと」として,水文調査法等の体系化,路線選定,施工法や湧水の有効活用,湧水量実態調査,近接するダムとトンネルとの相互関係,トンネル湧水の水質等の各項について述べることとする。この論文が,トンネルに関わる研究者や技術者の一助になれば,幸いである。

著者

大島 洋志 松本 雄二 市橋 学 柿原 宏

出版者

Japan Society of Engineering Geology

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.42, no.2, pp.123-130, 2001-06-10 (Released:2010-02-23)

参考文献数

7

被引用文献数

1 1

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南九州には特殊地質のシラスが広域に分布している. このシラス地帯に新幹線を建設する場合, 地下水面下のトンネルの設計・施工法が大きな課題となる. ここではこの課題に対して, 路線選定段階, トンネルの設計段階ならびに施工段階で払った3つの対策, すなわち縦断線形での配慮, 透水性路盤の採用, 切羽の自立性を確保するためのウェルポイントによる地下水位低下工法の採用, について記述する.

著者

池田 和彦 大島 洋志

出版者

Japan Society of Engineering Geology

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.12, no.1, pp.51-63, 1971-03-01 (Released:2010-02-23)

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The route for SANYO SHIN KANSEN (New Sanyo Line) between Okayama and Hakata was selected as to connect every significant cities along the line with straight lines and as aconsequence it includes many tunnels amounting to 218km of the total distance of 400km. According an outline of the project for construction is described laying emphasis on geological problems relating to tunnel construction.

著者

大島 洋志

出版者

一般社団法人日本応用地質学会

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.9, no.3, pp.113-128, 1968-09-01

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The author was engaged in the construction of the Yokohama line, from Higashi-Kanagawa to Kikuna, in Japanese National Railways as the engineering assistant headman of the Higashi-Kanagawa construction division. The work was executed without a hitch at March `68, however there are some grate difficulties from the constructional point of view. They were very important problems for the division to carry out safely near the Tokaido line, the largest artery for Japanese transportation, and to administer the amount of construction. Provided that mentioned to pure engineering problems, they were cleared that there were some soil mechanical problems in considerable wait. The geology in this area consists of alluvial sand and mud, diluvial sand, mud and loam, and pleistcene sandy mudstone. There were such difficulties as to difine the length of piles, to give consideration for the consolidation settlement and excavation for the reaseon of existence of deep soft ground, drowned valley, water saturated sand strata and etc... In this paper the author describes above mentioned engineering geological problems and feelings on this on this division in a few words

著者

大島 洋志 徳永 朋祥 宮島 吉雄 田中 和広 石橋 弘道

出版者

一般社団法人日本応用地質学会

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.37, no.4, pp.351-358, 1996-10-10

参考文献数

24

被引用文献数

1 6

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Data on various hydrological and geochemical fluctuations caused by the 1995 Hyogo-ken Nanbu Earthquake were accumulated. We reported fluctuations of the relatively shallow groundwater at the Nuruyu area, the Northern Awaji Islands, and those of the deeper one at the regional (about 300km&times;300km) scales. Then, we briefly reviewed the precursory geochemical changes in groundwater.<BR>Groundwater gushed out soon after the earthquake at around the Nuruyu and Nojima-Tokiwa areas, which are situated to the east of the Nojima fault, and then has dried up within the several months. There has been no sign of the recovery of groundwater level in wells one year after the earthquake. The water springing out at the hanging wall side along the Nojima fault seemed to be moved from the eastern mountainous area where groundwater has dried up.<BR>Groundwater in deep underground also fluctuated by the earthquake and their spatial distribution seemed to be related to the distance and the direction from the epicenter of the earthquake. Temperature increase at several hot springs has also been observed after the earthquake.<BR>The investigation of the groundwater fluctuations is important not only for the prediction of earthquakes but also for the engineering geological activities, such as planning water supply for the mountainous villages, monitoring and solving groundwater pollution problems, and evaluating long-term stability of deep underground environments. We proposed several plans to monitor and manage data on groundwater fluctuations both in usual times and at earthquakes. We also showed the recommended countermeasure for the fluctuations of hot springs, and pointed out the importance to prepare water supply plans for the places where the drops of water levels have been observed by the previous earthquakes.

著者

大島 洋志

出版者

一般社団法人 日本応用地質学会

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.27, no.4, pp.202-209, 1986-12-25 (Released:2010-02-23)

参考文献数

6

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There are some empirical roules to be observed in the tunnel route location. The author discusses mainly on the tunnel route selection concerned the problems of depletion of water resources from his engineering experiences from a standpoint of environmental geology.

著者

大島 洋志

出版者

一般社団法人 日本応用地質学会

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.9, no.3, pp.113-128, 1968-09-01 (Released:2010-06-04)

参考文献数

5

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The author was engaged in the construction of the Yokohama line, from Higashi-Kanagawa to Kikuna, in Japanese National Railways as the engineering assistant headman of the Higashi-Kanagawa construction division.The work was executed without a hitch at March '68, however there are some grate difficulties from the constructional point of view. They were very important problems for the division to carry out safely near the Tokaido line, the largest artery for Japanese transportation, and to administer the amount of construction.Provided that mentioned to pure engineering problems, they were cleared that there were some soil mechanical problems in considerable wait. The geology in this area consists of alluvial sand and mud, diluvial sand, mud and loam, and pleistcene sandy mudstone. There were such difficulties as to difine the length of piles, to give consideration for the consolidation settlement and excavation for the reason of existence of deep soft ground, drowned valley, water saturated sand strata and etc.In this paper the author describes above mentioned engineering geological problems and feelings on this on this division in a few words

著者

大島 洋志

出版者

一般社団法人日本応用地質学会

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.40, no.6, pp.333-339, 2000-02-10

被引用文献数

1 1

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今から20年ほど前, 山陰本線奈古-長門大井間で大規模斜面崩壊があった.崩壊は2か月の間に前後3回生じた.第2回目の崩壊の後現地調査をした筆者は, 運転再開は上部の土塊を除去したうえで行うべきと主張したが, 不本意ながら地すべり観測による運転規制をするという条件で, 運転再開に妥協してしまった.しかし, 不安は現実のものとなり, 再開2週間後に第3回目の崩壊が発生した.列車通過40分後の崩壊であり, まかり間違えば大惨事になる可能性をもった災害であった.なぜ, こういう事態になったのか, 過去のデータやメモ・記憶等をもとに, 災害を再度振り返り, そこから得られる反省と教訓とを整理する.