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Yamazaki, Masanao; Morioka, Hiroshi*; Hatsuyama, Yoshihiro*; Tsusaka, Kimikazu
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.305 - 310, 2008/09
The underground research shafts and drifts have been constructed in Horonobe by JAEA. The observational construction program to reflect the various data obtained by the shaft excavation for designing and construction was setted on and is being presently applied. The support design was carried out by numerical analysis considering the excavating liberaring power according to the excavation progress. But, it was clear that measurement data of lining stress in G.L.-121m included the influence of extra lining thickness and excavation of drifts in G.L.-140m. We report on the outline of the observational construction program and the result of analyzing the measurement data of the lining stress.
Sanada, Hiroyuki; Matsui, Hiroya; Fujii, Yoshiaki*
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.703 - 708, 2008/09
This paper shows the result of rock mechanical investigations which have been carried out as a part of the investigations of Horonobe Underground Research Project. The results of the investigations are summarized as follows. Uniaxial compression and tensile strength of siliceous rock distributed in Wakkanai formation is larger than diatomaceous mudstone distributed in Koetoi formation. Stress-strain curve shows strain softening behavior from results of tri-axial compression test. Pore pressure and dilatancy behavior show different trends as compared with diatomaceous mudstone and siliceous rock.
Nakamura, Takahiro; Kato, Harumi*; Sanada, Hiroyuki; Sugita, Yutaka
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.297 - 303, 2008/09
This paper shows the results of initial stress obtained from stress relief method, hydraulic fracturing technique and breakout analysis which have been carried out at 140 m niche as a part of the investigation of Horonobe Underground Research Project. The results of investigations are summarized as follows. Initial stress measuring has been tried by stress relief method, but none of the gluing of the gage plugs was successful because clayish slime stuck over the end of the borehole. The direction and value of initial stress obtained from hydraulic fracturing technique and breakout analysis was closely similar.
Tsusaka, Kimikazu; Yamazaki, Masanao; Hatsuyama, Yoshihiro*; Yamamoto, Takuya*
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.311 - 317, 2008/09
Japan Atomic Energy Agency has constructed an underground research laboratory in Horonobe to establish the reliable engineering technologies related to geological disposal. At the end of March 2008, the ventilation and access shafts reached 161 m and 110 m in depth, respectively. During the shaft sinking, measurements of convergence and stress of support members are carried out in order to feed the results to the selection of the appropriate magnitude of support at deeper levels. In this paper, the authors clarified the depth distribution of the strength of rock and frequency of fracture on shaft wall and the relationship between the initial deformation rate and deformation ratio based on the convergence measurement.
Takeuchi, Shinji; Hara, Masato; Mikake, Shinichiro; Tsuruta, Tadahiko; Ikeda, Koki; Yamamoto, Masaru
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.189 - 196, 2008/09
The Mizunami Underground Research Laboratory (MIU) is currently being constructed. During its construction, water inflow into the shafts of the MIU has been increasing and affecting the project progress. In order to reduce the water inflow into the shafts, pilot borehole investigations and pre-excavation grouting have been planned. The pilot borehole investigations has been conducted from the shaft bottom at bothe of the Main (180mbGL) and Ventilation (191mbGL) shafts, respectively. The pre-excavation grouting has been undertaken in the Ventilation Shaft. The results of the investigations have showed applicability of several techniques applied.
Ogawa, Toyokazu*; Kinomura, Koji*; Aoki, Tomoyuki*; Yamamoto, Takuya*; Sanada, Hiroyuki; Matsui, Hiroya
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.933 - 940, 2008/09
Japan Atomic Energy Agency is planning to conduct researches into geological disposal of high-level radioactive wastes in the Horonobe site located in Hokkaido, Japan. As part of the underground research facilities, two 500m-long vertical shafts have been constructed in tertiary sedimentary rocks since 2005. The surrounding rocks are known to exhibit strain-softening characteristics, necessitating appropriate modelling in the stability analysis. In addition the rocks physical properties often vary with depth. This study shows the results of three-dimensional numerical analysis of the ventilation shaft, taking the construction sequence and the variation of rock properties with depth into consideration.
Aoki, Tomoyuki*; Sanada, Hiroyuki; Jo, Mayumi*; Yamamoto, Takuya*; Matsui, Hiroya
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.709 - 716, 2008/09
Long-term behaviors of a tunnel at great depth in sedimentary soft rocks are investigated based on pore fluid-mechanical interaction. Poroelastic parameters of diatomaceous and siliceous mudstones at the Horonobe URL site are determined from the tests proposed in this study using a triaxial test apparatus. The test procedures with their theoretical base are described. Coupled fluid-mechanical behaviors on circular and horse-shoe-shaped tunnels supported with shotcrete are numerically analyzed based on the theory of poroelasticity. Some long-term behaviors of rocks and supports peculiar to the fluid-mechanical interaction differing from creep behavior are found from the analysis results.
Xu, Z.*; Matsui, Hiroya; Sato, Toshinori*; Itakura, Kenichi*; Yamachi, Hiroshi*
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.647 - 652, 2008/09
Various data, such as investigation data, design data and/or field measured data arising during a course of the large-scale underground development are possible and important information, which can contribute to not only design and/or construction work but also maintenance of facilities. However, it is difficult to control and properly operate such enormous data throughout a long term included by an operation period of facilities. Authors developed management system for large-scale underground development system which adopted virtual reality technology and RDBMS as one answer for such problem. In addition, this system was applied experimentally to the Mizunami Underground Research Laboratory construction. This paper asks the validity of proposing technique, while the practice of design and mounting of the system is shown.
Tani, Takuya*; Shimono, Masato*; Iwano, Masahiro*; Yamamoto, Takuya*; Yamazaki, Masanao; Sanada, Hiroyuki
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.319 - 324, 2008/09
During the construction of the Horonobe URL shaft, some measurements have been carried out to verify the design and construction method in sedimentary soft-rock. The results obtained from the in-situ measurements at the G.L.-121 m show the unique behavior of surrounding rock masses. This paper reports the result of the numerical simulation of the behavior around the shaft excavation by short step-method. In the analysis using axisymmetric elastic FEM model, construction procedure including the high stiffness lining concrete is accurately followed and the deformation behavior around the shaft is well simulated. Consequently it is found that the excavation release ratio in the short step excavation method is different from one in the typical NATM tunnel excavation.
Nobuto, Jun*; Matsui, Hiroya; Mikake, Shinichiro; Kusano, Takashi*; Kuroda, Hidetaka*
no journal, ,
no abstracts in English
Ijiri, Yuji*; Motoshima, Takayuki*; Kamemura, Katsumi*; Mikake, Shinichiro; Matsui, Hiroya; Sugihara, Kozo
no journal, ,
no abstracts in English