掲載雑誌（和）： 岩盤力学に関するシンポジウム講演論文集 Vol： 22巻 年： 1990年 頁： 476-480頁 著者（和）： 二宮康郎，　杉原　弘造，　伊藤　克夫，　亀村　勝美，　青木　智幸 タイトル（和）： ジオトモグラフイーによる地下空洞周囲緩み領域の評価について 抄録（和）：
many in-situ measurements have been キーワード（和）： - 掲載雑誌（英）： PROCEEDINGS OF THE SYMPOSIUM ON ROCK MECHANICS 著者（英）： Yasuo NIINOMIYA, Kozo SUGIHARA, Katsuo ITOU, Katsumi KAMEMURA, Tomoyuki AOKI タイトル（英）： ON THE EVALUATION OF DISTURBED ZONE AROUND A DRIFT BY MEANS OF SEISMIC TOMOGRAPHY 抄録（英）：
Recently, some projects have been planned to make facilities in deep underground space, because of its superior stable environment. To realize them, a lot of technical problems should be solved. Developing the techniques to evaluate the disturbed zone induced by underground cavern excavation may be one of the most important problems. In-situ tests to measure the change and the distribution of mechanical/hydraulic properties of disturbed zone around a drift have been carried out. The test site is the PNC Tono Mine in Toki, Gifu. A test drift (3.0m width, 3.0m height, and 20m length) was newly excavated, parallel to the existing drift, at the depth of 140m in the sedimentary rocks . During the excavation, the ground displacements around the test drift were monitored from the existing drift. Only rock bolting was employed as the supporting measures of the drift. many in-situ measurements have been carried out including seismic wave velocity, permeability, and initial stress measurements of the ground. In this paper, the results of seismic tomography and refraction investigation in order to evaluate the distribution of seismic velocity due to the excavation are presented. The disturbed zone as velocity decreased area has been detected very clearly around the drift. キーワード（英）： - 記事区分： - 区分 　　　委員会論文集