Evaluation of the excavation disturbed zone of sedimentary rock in the Horonobe Underground Research Laboratory

Kubota, Kenji*; Aoyagi, Kazuhei; Sugita, Yutaka

Proceedings of 2019 Rock Dynamics Summit in Okinawa (USB Flash Drive), p.729 - 733, 2019/05

During the excavation of shafts and galleries in the deep subsurface for disposing of high-level radioactive waste, an excavation disturbed zone (EdZ) or excavation damaged zone (EDZ) is developed around the shafts and galleries. Such zones could influence the transfer behavior of radioactive nuclides, and it is therefore important to understand the behavior of the EdZ or EDZ. We performed in situ experiments before, during, and after gallery excavation in galleries of 140 and 250 m in depth in an area of soft sedimentary rock in Japan. The results demonstrate that the extent of fractures induced by the gallery excavation related with EDZ was confined to about 0.45 m from the gallery wall in the 140 m gallery and to about 1 m from the gallery wall in the 250 m gallery. The extent of the unsaturated zone related with EdZ was about 1 m in the 140 m gallery, but an unsaturated zone did not appear in the 250 m gallery.

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Imai, Hisashi*; Nishida, Kaoru*; *; Amemiya, Kiyoshi*; Lin, Weiren*

PNC TJ1449 98-004, 231 Pages, 1998/02

PNC-TJ1449-98-004.pdf:16.85MB

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PNC TJ1449 95-005, 252 Pages, 1995/03

PNC-TJ1449-95-005.pdf:10.56MB

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A Case study by the numerical simulation for long term changing of the geological environment around a drift in Horonobe URL, 2; Hydrological simulation

Ito, Ryo*; Maemura, Tsuneyuki*; Matsui, Hiroya; Ozaki, Yusuke; Mochizuki, Akihito; Goke, Mitsuo*; Okihara, Mitsunobu*; Toguri, Satohito*

no journal, , 

The report summarized the hydrological simulation about a case study for long term changing of the geological environment around a drift in Horonobe URL.