Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Nagata, Shohei*; Ichida, Toshiyuki*; Fujieda, Daigo; Aoyagi, Kazuhei
Tunnelling into a Sustainable Future; Methods and Technologies; Proceedings of the ITA-AITES World Tunnel Congress 2025 (WTC 2025), p.3517 - 3524, 2025/05
We performed three-dimensional excavation analysis of three shafts and intersection of horizontal tunnel excavated to 500 m depth at Horonobe URL, and evaluated stress acting on concrete lining under various conditions such as differences in diameter of shafts, lining shape, lining thickness, concrete strength, and installation interval of the lining. The design of the support was determined based on the analysis results, and then the construction of the shafts and horizontal galleries were started. Considering the measured stress acting on the concrete lining of the shaft and sprayed mortar installed at the intersection of shaft and horizontal gallery, we could successfully excavate the shaft to 500 m depth and intersection of horizontal gallery at 420 m depth. We also concluded that appropriate support pattern can be selected based on the measured stress acting on the concrete lining and numerical analysis performed prior to the excavation. This can contribute to enhance the reliability of the appropriate observational construction technology targeting excavation of shaft.
Sakurai, Akitaka; Aoyagi, Kazuhei; Murakami, Hiroaki; Tamura, Tomonori; Fujieda, Daigo; Togase, Kazuki
JAEA-Data/Code 2024-005, 48 Pages, 2024/07
JAEA-Data-Code-2024-005.pdf:6.54MB
JAEA-Data-Code-2024-005-appendix(DVD-ROM).zip:1029.9MB
We currently focus on the three tasks that were identified as "key R&D challenges to be tackled" in the "Horonobe Underground Research Plan for the fiscal year 2020 Onwards". These tasks include "Study on near-field system performance in geological environment", "Demonstration of repository design options", and "Understanding of buffering behaviour of sedimentary rocks to natural perturbations". To implement these tasks, we will excavate shafts and galleries to the 500 m depth. From fiscal year 2023, we will start extension of the 350 m gallery excavating 3 horizontal gallery (Niches No.6, No.7, and Niche of the East Shaft No.1) and excavation of the shaft to the 500 m depth and excavation of 500 m gallery. This report summarizes the measurement data acquired at Niches No.6, No.7, and Niche of the East Shaft No.1 in fiscal year 2023 to accumulate the basic data for carrying out the Observational Construction Program for the excavation of the shaft to the 500 m depth and galleries at the 500 m depth.
Maeno, Katsuji*; Ichida, Toshiyuki*; Osada, Shohei*; Fujieda, Daigo; Nabana, Ryohei
no journal, ,
no abstracts in English
Ishii, Yoshiki*; Osada, Shohei*; Otsuka, Isamu*; Ichida, Toshiyuki*; Fujieda, Daigo; Nabana, Ryohei
no journal, ,
no abstracts in English
Ichida, Toshiyuki*; Ishii, Yoshiki*; Osada, Shohei*; Otsuka, Isamu*; Fujieda, Daigo; Nabana, Ryohei
no journal, ,
no abstracts in English
Yagi, Keisuke*; Sanoki, Satoru*; Hayano, Akira; Fujieda, Daigo; Nabana, Ryohei
no journal, ,
no abstracts in English
Sanda, Takayoshi*; Maeno, Katsuji*; Sanoki, Satoru*; Fujieda, Daigo; Nabana, Ryohei
no journal, ,
no abstracts in English
Hirooka, Shinichi*; Maeno, Katsuji*; Oshino, Yoshiyuki*; Fujieda, Daigo; Nabana, Ryohei
no journal, ,
no abstracts in English
