青函トンネル海底部の地質 : 断層と湧水(<小特集>青函トンネル)

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There are many faults in area of Kunnui Formation, but few in Kuromatsunai Formation. It seems to the reason of the geological age and of which Kunnui Formation is mainly underlain by solid character's rock (tuff, lapilli tuff, and tuff breccia) and Kuromatsunai Formation is fluid quality (mudstone). The biggest fault is F.10 fault which appeared in about 33 km. The thrust length seems to about five hundred meters, because Fukuyama Formation is in fault contact with Kunnui Formation. (Kn 4). About one kilometer or Kunnui Formation (tuff and mudstone, Kn 2~Kn 4) near the fault is squeezing ground, and the maximum earth pressure amount to 2.0 MPa. Excavating of main tunnel carried out by the circular short bench (with spring line drift) method after elavolate grouting. On the other hand, during the construction there were four accidents of water inrushing in the area of fault zone. Every restoration work took about five to twelve months. In the fault zone, as advance boring came to deadlock, investigation for proving was carried out by short drilling (coring and noncoring ) from working face and side well . To prevent water inrushing, new technologies of measuring must be developed to grasp the process of seepaging and loosening of the ground. This is very important task for maintenance of tunnel. Meanwhile, chamical quality of seepage water is almost near that of sea water and is alteration sea-water type by exchange of ion, and partially is hot-spring type.
一般社団法人日本応用地質学会の論文
1988-06-25

青函トンネル海底部の地質 : 断層と湧水(<小特集>青函トンネル)

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