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Journal Articles

Three-dimensional visualization of methane concentration distribution in tunnels to increase underground safety

Nago, Makito*; Motoshima, Takayuki*; Miyakawa, Kazuya; Kanie, Shunji*; Sanoki, Satoru*

Proceedings of ITA-AITES World Tunnel Congress 2017 (WTC 2017) (USB Flash Drive), 10 Pages, 2017/06

This study presents a new approach to increase construction safety under methane inflow conditions by providing the three-dimensional concentration distribution of methane in underground structures. The study was conducted at the Horonobe Underground Research Laboratory, which is located in Neogene sedimentary rock where groundwater contains dissolved methane. As conventional gas sensors are confined to measurement at a single point in time and space, a new system was developed combining a laser methane detector and a laser range finder to effectively obtain the spatial concentration distribution of methane. This system was tested in tunnel galleries located at a depth of 350 m. The results show that this system is effective for identifying unpredicted methane emissions as well as predicted emission hotspots and for examining the validity of the ventilation scheme, which ensures construction safety.

Journal Articles

Variation of hydraulic properties on sedimentary rock due to shear deformation

Goke, Mitsuo*; Ishii, Takashi*; Sanoki, Satoru*; Matsui, Hiroya; Sugita, Yutaka

Dai-40-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.282 - 287, 2011/01

In order to investigate the variation of hydraulic properties on soft rock due to shear deformation, permeability tests were performed on hard shale of the Wakkanai formation by axial flow and radial flow techniques under triaxial compression. The experimental results showed that the axial direction permeability increased to approximately 10 times lager than the initial one in residual strength zone. On the other hand, the radial direction permeability increased remarkably in strain softening zone. The results suggested that a permeability increase could be restrained, if the strain softening is not to be attained in the rock mass surrounding caverns by invention of construction methods.

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

Development of monitoring method for rock and groundwater behaviors using high precision tiltmeters

Ijiri, Yuji*; Hatsuyama, Yoshihiro*; Nago, Makito*; Sato, Masaru*; Sanoki, Satoru*; Kunimaru, Takanori; Sugita, Yutaka

no journal, , 

no abstracts in English

Oral presentation

Horonobe URL Project, Development of engineering techniques for use in the deep underground environment; A Study for disaster measures "Fire gas behavior analysis"

Abe, Hironobu; Shimoyama, Tadashi; Yamasaki, Masanao*; Sanoki, Satoru*

no journal, , 

no abstracts in English

Oral presentation

Study on applicability of 3D methane laser scanning system for construction and operation of tunnels

Motoshima, Takayuki*; Shirase, Mitsuyasu*; Sanoki, Satoru*; Miyakawa, Kazuya

no journal, , 

Release of methane gas from sedimentary formations is often reported during excavation or operation of tunnels. Detecting methane gas, an odorless and colorless gas, is an important safety issue during construction and operational phases as it is explosive when mixed with air. This paper presents an approach to detect methane gas by integrating a laser methane detector into a 3-dimensional laser scanning system, including the system setup, performance of the system in the field, data implementation, and data visualization method. The system was tested at the underground research laboratory located at a depth of 350 m in sedimentary formations.

Oral presentation

Planning construction and monitoring of engineered barrier system experiment by construction information modeling

Shirase, Mitsuyasu*; Nago, Makito*; Nakayama, Masashi; Ono, Hirokazu; Sanoki, Satoru*; Shigehiro, Michiko*

no journal, , 

Full-scale engineered barrier system (EBS) experiment for high-level waste disposal is being conducted by the Japan Atomic Energy Agency at 350m level gallery in Horonobe Underground Research Laboratory, Japan, in order to obtain data for evaluating coupled THMC phenomena overtime after the installation of the EBS. This paper presents planning construction and monitoring of the engineered barrier system experiment by Construction Information Modeling.

Oral presentation

In-situ measurement using of high resolution elastic wave velocity measurement system to understand a groundwater flow in rock mass

Matsui, Hiroya; Ishiyama, Koji*; Yoshino, Osamu*; Hikima, Ryoichi*; Sanoki, Satoru*; Hayashi, Kunihiko*; Takahashi, Masahiro*; Sato, Masaru*

no journal, , 

This paper is described about the results of collaboration study between Nishimatsu cop. and JAEA to estimate the applicability of high resolution elastic wave velocity measurement for understanding of a groundwater flow. The measurement was carried out in the vicinity of the groundwater recovery test drift in MIU and it continued for about three month from just after starting at the drainage of the test drift. The results suggested that the elastic wave velocity change were measured with groundwater flow due to drainage of the test drift and the high resolution elastic wave velocity measurement can be applicable for understanding of groundwater flow.

Oral presentation

Tomography analysis for spatial distribution of methane

Yahiro, Hanae*; Motoshima, Takayuki*; Sanoki, Satoru*; Miyakawa, Kazuya

no journal, , 

no abstracts in English

Oral presentation

In-situ evaluation of high accuracy elastic wave measurement system with pseudo random wave

Ishiyama, Koji*; Yoshino, Osamu*; Hikima, Ryoichi*; Matsui, Hiroya; Ozaki, Yusuke; Takeuchi, Ryuji; Sakakibara, Junichi*; Sanoki, Satoru*; Hayashi, Kunihiko*

no journal, , 

In this study, we evaluate the high accurate elastic wave measurement system at the 500m stage in Mizunami underground research laboratory. We used the sine and pseudo random wave between 0.5 kHz and 20 kHz as source signals and received them by 6 receivers. We observed that the elastic wave became low speed and high attenuation around the zone where the rock classification was lower than surroundings. From this result, we could capture the damaged zone by elastic wave. For the capability of deeper exploration, we need to improve the transmission system.

11 (Records 1-11 displayed on this page)
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