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Journal Articles

A Study on rock mass behaviour induced by shaft sinking in the Horonobe Underground Research Laboratory

Tsusaka, Kimikazu; Tokiwa, Tetsuya; Inagaki, Daisuke; Hatsuyama, Yoshihiro*; Koike, Masashi*; Ijiri, Yuji*

Doboku Gakkai Rombunshu, F1 (Tonneru Kogaku) (Internet), 68(2), p.40 - 54, 2012/09

Japan Atomic Energy Agency has excavating three deep shafts through soft sedimentary rock at Horonobe Underground Research Laboratory. In this paper, the author discussed rock mass behaviour induced by the 6.5 m diameter shaft sinking. They conducted geological mapping in an excavation face and boreholes digged around the shaft wall, field measurements such as convergence measurements and monitoring of rock displacements using multi-interval borehole extensometers around a shaft at around 160 m and 220 m in depths, and three-dimensional numerical analysis which models the shaft excavation procedure such as timing of installation of support elements and setting and removal of a concrete form. As a result, it was clarified that remarkablely large compressive strains occurred within about 1 m into the shaft wall since the rock mass behaviour was controlled by the concrete lining and that the behaviour would predominantly be induced by the fractures closing which opened significantly and propagated during excavation steps before the installation of a concrete lining and the directions where the strains occurred heavily depended on the fracture orientation around the shaft.

Journal Articles

A Study on mechanical behaviour of support elements induced by shaft sinking

Tsusaka, Kimikazu; Inagaki, Daisuke; Hatsuyama, Yoshihiro*; Koike, Masashi*; Shimada, Tomohiro*; Ijiri, Yuji*

Doboku Gakkai Rombunshu, F1 (Tonneru Kogaku) (Internet), 68(1), p.7 - 20, 2012/05

Japan Atomic Energy Agency has excavating three deep shafts through soft sedimentary rock at Horonobe Underground Research Laboratory. In this paper, the author discussed change in stress and the stress distribution in a concrete lining and steel arch sets induced by the 6.5 m diameter shaft sinking. They conducted not only field measurements of stress in support elements at around 220 m in depth but also three-dimensional numerical analysis which models the shaft excavation procedure such as timing of installation of support elements and setting and removal of a concrete form. As a result, it was clarified that more than 10 MPa difference in circumferential stress occurred in a 2 m high and 400 mm thick concrete lining due to anisotropy of initial stress and three-dimensional effect of an excavation face. It was also found that a concrete lining gradually deformed from an original cylindrical form to an "oval salad bowl" form with the long axis pallarel to the direction of the minimum horizontal principal stress after a concrete form was removed.

Journal Articles

A Study on mechanical behaviors of concrete lining and rock caused by shaft sinking at the Horonobe Underground Research Laboratory

Tsusaka, Kimikazu; Inagaki, Daisuke; Koike, Masashi*; Ijiri, Yuji*; Hatsuyama, Yoshihiro*

Harmonising Rock Engineering and the Environment, p.305 - 308, 2011/10

In this paper, the authors discussed circumferential stress distribution in a concrete lining and displacement of rock around shaft wall induced by shaft excavation at Horonobe Underground Research Laboratory. Field measurements of the lining stress and rock displacement were conducted between 218 m and 220 m in depths during excavation of a 6.5 m diameter access shaft and the results were analyzed using a three-dimensional numerical model. As a result, it was found that the maximum and minimum stresses occurred in the direction of horizontal minimum and maximum initial stresses, respectively. It was also clarified that difference in the stress between the maximum and minimum values was beyond 10 MPa. In addition, it was found that compressive axial strain occurred around a shaft wall after casting concrete lining since rock behavior in the vicinity of shaft wall was controlled by a concrete lining.

Journal Articles

Influence of a fault system on rock mass response to shaft excavation in soft sedimentary rock, Horonobe area, northern Japan

Tokiwa, Tetsuya; Tsusaka, Kimikazu; Ishii, Eiichi; Sanada, Hiroyuki; Tominaga, Eiji*; Hatsuyama, Yoshihiro*; Funaki, Hironori

International Journal of Rock Mechanics and Mining Sciences, 48(5), p.773 - 781, 2011/07

 Times Cited Count:12 Percentile:72.29(Engineering, Geological)

This paper focuses attention on stress field that produced fault system, and presents an example of the relationship between fault system and rock mass response to shaft excavation in soft sedimentary rocks in the Horonobe area, Japan. The directions determined by fault-slip analysis are close to the direction of maximum and minimum diameter reduction in the shaft. The results show that fault system can affects rock mass response to shaft excavation in soft rock and furthermore, and it is considered that the rock mass deformation was controlled by fault system. In addition, it is likely that we can assess and predict rock mass behavior by focusing on palaeo-stress field that produced fault system.

Journal Articles

Study on the behavior of concrete lining and rock mass during shaft excavation in the Horonobe URL Project, 1

Inagaki, Daisuke; Tsusaka, Kimikazu; Ijiri, Yuji*; Koike, Masashi*; Hatsuyama, Yoshihiro*

Dai-40-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), 6 Pages, 2011/01

no abstracts in English

Journal Articles

A Study on the behaviour of concrete lining and rock mass during shaft excavation at the Horonobe URL project, 2

Tsusaka, Kimikazu; Inagaki, Daisuke; Koike, Masashi*; Ijiri, Yuji*; Hatsuyama, Yoshihiro*

Dai-40-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.7 - 12, 2011/01

no abstracts in English

JAEA Reports

Horonobe Underground Research Laboratory Project; The Results of the pilot borehole investigation of the ventilation shaft (PB-V01); Geophysical loggings

Funaki, Hironori; Asamori, Koichi; Sanada, Hiroyuki; Hatsuyama, Yoshihiro*; Yamamoto, Takuya*; Ijiri, Yuji*; Matsuoka, Kiyoyuki*; Kimura, Kazuhiro*; Lin, S.*; Kumagai, Toshifumi*

JAEA-Data/Code 2010-002, 151 Pages, 2010/06

JAEA-Data-Code-2010-002.pdf:43.13MB

JAEA is implementing Horonobe URL Project as research and development of geological disposal. The investigation of the pilot boring was carried out around the Ventilation shaft in order to decide grouting plan and plant of effluent treating. This report summarize as data-code results of geophysical loggings.

Journal Articles

Rock deformation and support load in shaft sinking in Horonobe URL Project

Tsusaka, Kimikazu; Yamazaki, Masanao; Hatsuyama, Yoshihiro*

Proceedings of Rock Engineering in Difficult Ground Conditions; Soft Rocks and Karst (EUROCK 2009), p.589 - 594, 2009/10

Observational construction is essential in underground excavation since it is difficult to estimate rock mass properties based on geological investigation from the ground surface. In the construction, the amount of support elements at the next stage is redesigned by measuring rock mass deformation and support stress caused by excavation. JAEA has been constructing an underground research laboratory in Horonobe. Based on the observational construction, ventilation and access shafts have been excavated 250 m deep and 140 m deep from the ground surface, respectively. The authors investigated the relationship between the initial deformation rate and stress of concrete lining. The initial deformation rate is related to the ratio of the elastic modulus of rock mass to the initial stress and one of indices of rock mass properties. The relationship is helpful to determine whether the amount of designed support elements should be changed at the earlier stage of excavation.

JAEA Reports

Horonobe Underground Research Laboratory project overview of the pilot borehole investigation of the ventilation shaft (PB-V01); Hydrogeological investigation

Yabuuchi, Satoshi; Kunimaru, Takanori; Ishii, Eiichi; Hatsuyama, Yoshihiro*; Ijiri, Yuji*; Matsuoka, Kiyoyuki*; Ibara, Tetsuo*; Matsunami, Shinjiro*; Makino, Akiya*

JAEA-Data/Code 2008-026, 62 Pages, 2009/02

JAEA-Data-Code-2008-026.pdf:8.23MB

The Pilot Borehole Investigation of the Ventilation Shaft was conducted in Horonobe, Hokkaido, Japan from October 2007 to March 2008. Main purpose of the investigation is to understand geological, hydrogeological and hydrochemical properties of the formation where the Ventilation Shaft has been excavated. Hydraulic packer tests show that hydraulic conductivity lies in the range from 1.1E-11 to 1.4E-7 m/sec down to 500 m in depth. This heterogeneity mainly depends on the distribution and permeability of groundwater inflow points, which were detected by Fluid Electric Conductivity logging. High conductive zones were found between 263 m and 290 m, 355 m and 370 m of the depth in the pilot borehole. An effective method for reducing groundwater inflow should be considered for the deeper Ventilation Shaft excavation.

Journal Articles

Correlation between initial deformation ratio of convergence and lining stress in shaft excavation

Yamazaki, Masanao; Tsusaka, Kimikazu; Hatsuyama, Yoshihiro*; Minamide, Masashi*; Takahashi, Akihiro*

Dai-38-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.196 - 201, 2009/01

The Underground Research Laboratory in Hokkaido has been constructed by JAEA. In shaft excavation, convergence, lining stress, etc. are measured and analyzed in order to evaluate the validity of a support design. In this report, correlation between initial deformation ratio of convergence and lining stress in shaft excavation is discussed. Prediction equation of the lining stress from the initial deformation ratio of convergence in the short step method is also proposed.

Journal Articles

Observational construction and behavior measurements for underground research shaft excavation of the Horonobe Underground Research Laboratory project

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.

Journal Articles

Estimation of convergence curves through shaft excavation in Horonobe underground research laboratory

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.

JAEA Reports

Horonobe Underground Research Laboratory project overview of the pilot borehole investigation of the ventilation shaft (PB-V01); Geological investigation

Funaki, Hironori; Tokiwa, Tetsuya; Ishii, Eiichi; Hatsuyama, Yoshihiro*; Matsuo, Shigeaki*; Tsuda, Kazuyasu*; Koizumi, Akira*; Ishikawa, Taiki*; Daijo, Yuichi*; Sugiyama, Kazutoshi*

JAEA-Data/Code 2008-013, 65 Pages, 2008/08

JAEA-Data-Code-2008-013.pdf:6.38MB

We conducted geological investigation of the pilot borehole of the ventilation shaft in Horonobe during October 2007 and March 2008. This report describes the field operations (core description, core photograph, and core sampling) and laboratory measurements (modal analysis and X-ray diffraction analysis), equipments as well as processing procedures, and shows the obtained results. The information obtained from this investigation will be reflected in spring water control plan on shaft excavation and additional plan of drainage treatment facilities.

Journal Articles

Proposal of a practical guide of convergence measurements in Horonobe Underground Research Laboratory

Tsusaka, Kimikazu; Yamazaki, Masanao; Hatsuyama, Yoshihiro*; Yamamoto, Takuya*

Proceedings of 42nd U.S. Rock Mechanics Symposium and 2nd U.S.-Canada Rock Mechanics Symposium (CD-ROM), 9 Pages, 2008/06

The mechanical stability of a tunnel is subject to the development of loosening zone. In tunneling, convergence measurement is the most convenient method to estimate support requirements. In order to predict the final deformation and the development of loosening zone based on the measurement at the earlier stage of excavation work in 12 m span tunnels, one of the authors had proposed the Rock Behavior Classification in Tunneling (RBCT) had been proposed. Japan Atomic Energy Agency has excavated a 4.5 m diameter ventilation and a 6.5 m diameter access shafts in Horonobe, Japan. It is expected to build a practical guide to feed the results from the convergence measurement to the excavation work at deeper stages. Therefore, the authors evaluated the applicability of RBCT by means of analyzing the convergence curves in three tunnels with different dimensions and compared the convergence curves in the shafts with RBCT. As a result, it was clarified that the range of 0.07 to 0.3% in the final deformation ratio and the range of 13 to 15% wide loosening zone in the excavated diameter were estimated when the range of 0.02 to 0.1%/m in the initial deformation ratio was observed.

Oral presentation

Distribution and frequency of fractures on shaft face in Horonobe Underground Research Laboratory

Tsusaka, Kimikazu; Yamazaki, Masanao; Minamide, Masashi*; Hatsuyama, Yoshihiro*

no journal, , 

no abstracts in English

Oral presentation

Comparing the rock behaviors obtained from high-precision tiltmeters and from the elastic analysis of shaft excavation

Hatsuyama, Yoshihiro*; Ijiri, Yuji*; Nago, Makito*; Kamemura, Katsumi*; Sato, Masaru*; Sanoki, Satoru*; Kunimaru, Takanori

no journal, , 

The data obtained from high-precision tiltmeters installed at the Horonobe URL was compared with the result of three-dimensional elastic analysis of shaft excavation.

Oral presentation

Data analysis of high-precision tiltmeters installed around the Horonobe underground research laboratory

Ijiri, Yuji*; Hatsuyama, Yoshihiro*; Nago, Makito*; Kamemura, Katsumi*; Sato, Masaru*; Sanoki, Satoru*; Kunimaru, Takanori

no journal, , 

Both the short- and long-period noises were filtered out from the data of high-precision tiltmeters installed at the Horonobe URL. Then, the effect of shaft excavation on these data was investigated.

Oral presentation

A Study of correlation between specific energy of tunnneling machine and crack frequency of mudstone

Yamazaki, Masanao; Fukui, Katsunori*; Minamide, Masashi*; Hatsuyama, Yoshihiro*

no journal, , 

The correlation between the energy per unit excavated volume calculated from the electric power consumption of the road header during the shaft excavation and the rock properties observed at the excavation wall was investigated in the Horonobe Underground Research Project. As a result, it was found that the energy per unit excavated volume correlate better with the rock mass classification determined from both a fracture intensity as well as a rock strength rather than with a fracture intensity. We will continue to measure the electric power consumption data in order to establish rock mass evaluation method using the energy per unit excavated volume.

Oral presentation

Study on the behavior of concrete lining and rock mass during shaft excavation by means of short step method

Sakai, Kazuo*; Koike, Masashi*; Aoki, Tomoyuki*; Yamamoto, Takuya*; Hatsuyama, Yoshihiro*; Yamazaki, Masanao

no journal, , 

In a construction project of the Horonobe URL, vertical shafts are excavated now by the Short Step method. This paper examines the behavior of concrete lining and rock mass around the shaft. To reflect the excavation sequence, a 3-D analysis is performed, modeling rock mass and support members around an advancing face. The analysis shows well specific phenomena of the Short Step method, as in the rock mass displacement and lining stress. It also reveals lining stress distribution are complex. In future, it is important to investigate lining stress through detailed measurements.

Oral presentation

Specific energy of a boom header in excavation and properties of a rock mass

Fukui, Katsunori*; Okubo, Seisuke*; Inagaki, Daisuke; Hatsuyama, Yoshihiro*; Yamamoto, Takuya*

no journal, , 

no abstracts in English

23 (Records 1-20 displayed on this page)