著者

吉川 恵也 朝倉 俊弘

出版者

Japan Society of Engineering Geology

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.22, no.1, pp.145-159, 1981-03-30 (Released:2010-06-04)

参考文献数

9

被引用文献数

2 2

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In pure geology, displacement and direction of faults are important concerns. On the other hand, forconstruction and maintenance of tunnels, the conditions of fractured rock and fault clay caused by faultsare taken seriously. However these faults often bring trouble to tunnel construction, since they have extensivescale, secondary faults, and form wide fractured zones in many cases. In such cases, if possible theyare kept away from the tunnel route and if the route crosses them unavoidably it is often difficult toexcavate through them.In this paper, we will first describe the outline of the problems in survey, design, construction, andmaintenance of railway tunnels in fractured zones. Next, we will report the examples of the geological surveysfor the Rokko Tunnel and the Shin-Kanmon Tunnel. The former crosses many faults in the Rokkomountains and the latter crosses the fractured zone under the straits of Kanmon. We also will report theexample of the seismic prospecting for the Shin-Sasago Tunnel in order to foresee where the tunnel crossesthe fractured zone.In addition, we will describe the construction methods to excavate through the fractured zone for theRokko Tunnel and Shin-Kanmon Tunnel. The Mukaiyama Tunnel was constructed by NATM, and thegreater convergence of the tunnel section was measured in the fractured zone even though rock bolts wereadded.At last, we will report the case in which the Inatori Tunnel was damaged by a seismic fault.

著者

吉川 恵也 田中 敏夫 三沢 清扶

出版者

Japan Society of Engineering Geology

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.9, no.2, pp.66-80, 1968-06-10 (Released:2010-06-04)

参考文献数

3

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We used tentatively a Rock Tunneling Machine on the bottom drift of Konoura Tunnel in Japanese National Railways (double track railway tunnel).The purposes of the test were the evaluation of suitability of the machine against geological condition and investigation of economical advantage of machine tunneling method.Rocks in the tunnel are mudstone and tuffacious mudstone which belong to Miocene, Tertiary, and then those compressive strength are 80 to 130kg/cm2 and those seismic speeds at the site are 1.8 to 2.2km/sec.The machine (bore diameter 2.3m) was Robbins type and was being built in the Komatsu Mfg. Co. it was successful on the test excavation. The total length of the excavating by the machine were 987.6m and rates of advance were 24.6m/day at maximum and approximately 350 m/month in average.This paper describes that:(1) Relation between cutter type and rock properties.(2) Relation between advance of excavation and rock properties.(3) Deformation of ground and surface of the drift after excavation on the machine and ordinary tunneling method.

著者

吉川 恵也

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.16, no.2, pp.45-55, 1975-06-30

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新関門トンネルは,昭和45年着工し,昭和49年完成した延長18.7km(内,海底区間0.9km)の本州と九州を隔てる関門海峡下を貫く鉄道トンネルである.本論文では,このトンネルの海底区間に焦点を絞り,路線選定の階段より,施工法の策定の段階に至るまでにおこなった地質調査と,その成果の工事への適用,および関門海峡早鞆瀬戸から大瀬戸に至るまでの海底の地質の大略について述べたものである.