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： 18巻 年： 1986年 頁： 436-440頁 著者（和）： 蓮井　昭則，山下　亮，世一　英俊 タイトル（和）： 岩盤における孔間弾性波測定システムとその適用について 抄録（和）：
- キーワード（和）： - 掲載雑誌（英）： PROCEEDINGS OF THE SYMPOSIUM ON ROCK MECHANICS 著者（英）： A.Hasui,R.Yamashita,H.Yoichi タイトル（英）： Cross-hole Seismic Measurement for Assessing Rock Mass 抄録（英）：
In assessing in-situ rock mass, seismic measurements are often excuted. Authors developed a cross-hole seismic measuring apparatus for investigating and /or assessing the rock mass. This apparatus consists of a transmitter and a receiver, and the measuring system is made up with a pulse generator, amplifier, digital-storage osciloscope and a microcomputer, Characteristics of this measureing system are as follows:(1) very small deviation of travel time(+-1-2 micro sec.)(2) using high frequency waves (20-60kHz)(3) high S/N ratio by using digital stacking Applying the above-entioned system, cross-hole seismic measurements were cariied out experimentally at two sites; one was an experimental granitic rock tunnel, and the other was a dam foundation of soft sedimentary rock. In the result, followings were turned out.(1) The quality of the rock mass between boreholes could be investigated at each depth.(2) The improvement of rock condition due to grouthing cluld be estimated.(3) S-wave velocity as well as P-wave velocity could be measured in good rock condition. From the above-mentioned results, such cross-hole seismic measuring system can be expected to be applied to investigate the depth of the relaxed zone caused by tunnel excavation and the behavior of rock mass subjected to heating and so on. Moreover, local mapping of the quality of the rock mass between boreholes, what is called, scanning technique , can be expected to develop. キーワード（英）： - 記事区分： - 区分 　　　委員会論文集