幌延深地層研究計画における地下研究施設の空洞安定性評価および支保設計(平成15年度)

Support design study for the Horonobe underground research facility in FY2003/2004

松井 裕哉 ; 森岡 宏之; 白戸 伸明; 大内 一利

Matsui, Hiroya; MORIOKA, Hiroyuki; Shirato, Nobuaki; Ouchi, Kazutoshi

本報告は、平成15年度に実施した幌延地下研究施設基本設計のうち、空洞安定性評価および支保設計の結果をとりまとめたものである。

JNC(Japan Nuclear Cycle development institute) has been conducting the project called "Horonobe URL project" in Horonobe-cho, Hokkkaido, Japan. The aim of the project is to establish the scientific and technical basis for geological disposal on sedimentary rock. In the project, a underground facility with 500m depth will be constructed. This report is summarized the results on support design of the planned underground facility based on the data obtained by the several borehole investigations from ground surface. Owing to rational support design, the detailed compartment of the input parameters for the stability analysis in surrounding rock at position of underground facility were made based on the results of borehole investigation in HDB-1, HDB-3, which were drilled near the position. Moreover, the idea of double support system was adopted in this study to minimize the support in underground facility.