Collection of measurement data obtained in the excavation of ventilation and east access shaft at the Horonobe Underground Research Laboratory Project

Aoyagi, Kazuhei  ; Murakami, Hiroaki  ; Tamura, Tomonori ; Fujieda, Daigo; Togase, Kazuki; Sakurai, Akitaka

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 excavate shafts and galleries to the 500 m depth. From Fiscal Year 2023, we started extension of the 350 m gallery excavating 3 horizontal gallery (Niches No.6, No.7, and 350 m Niche off 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 during the excavation of Ventilation and East access shaft to accumulate the basic data for carrying out the Observational Construction Program for the excavation of the shaft to the 500 m depth.