TY - CONF TI - Model experiment on change of seismic properties of a fracture caused by injecting/draining water; Chusui/haisui ni yoru kison kiretsu no dansei denpa tokusei no henka ni kansuru model jikken AB - Effect of water injection/draining on elastic waves penetrating through cracks is examined by measuring elastic waves before, during, and after the injection/draining of water into/from cracks in presence in granite. Two blocks of rock, with their crack-containing surfaces in contact with each other, are placed in a vessel, and water injection/draining is done through a hole on a vessel bottom side so that water will penetrate into the cracks. When the blocks are dry, there is almost no contact between the cracks, and so no crack penetrating waves are observed. Crack penetrating waves are produced when water is injected, and the position of the receiver sensing the penetrating waves changes as the water level rises. When the water level is lowered from the high water level, the waveform changes again as the level changes. The change in waveform is not so remarkable, however, as that observed during water injection thanks to the water residual in the cracks. It is now inferred that crack investigation is more effective when it is carried out with water being injected into dry cracks. The difference produced between the dry state and wet state when water is injected into dry cracks is used to detect the presence of cracks in this experiment, and this may be applied also to the investigation of cracks in the shallow part of the ground. 4 refs., 11 figs. AU - "Watanabe, T" AU - "Koizumi, T" AU - "Sassa, K [Kyoto University, Kyoto (Japan). Faculty of Engineering]" KW - "36 MATERIALS SCIENCE" KW - "58 GEOSCIENCES" KW - "44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS" KW - "ROCKS" KW - "GRANITES" KW - "CRACKS" KW - "WATER INFLUX" KW - "DRAWDOWN" KW - "SEISMIC WAVES" KW - "WAVE PROPAGATION" KW - "SIMULATORS" KW - "DRYING" KW - "TRANSMISSION" KW - "LEVELS" KW - "WAVE FORMS" KW - "WATER" KW - "RESIDUES" KW - "DETECTION" DO - https://doi.org/ UR - https://www.osti.gov/etdeweb/servlets/purl/522618 PB - CY - Japan PY - 1997 DA - 1997-05-27 LA - Japanese J2 - [] VL - C1 - Society of Exploration Geophysicists of Japan, Tokyo (Japan) C2 - C3 - CONF-9705167- C4 - C5 - Available from The Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, Japan; OSTI as DE97770262 L3 - Conference: 96. SEGJ conference, Butsuri tansa gakkai dai 96 kai (1997 nendo shunki) gakujutsu koenkai, Tokyo (Japan), 27-29 May 1997; Other Information: PBD: 27 May 1997; Related Information: Is Part Of Proceeding of the 96th (spring, fiscal 1997) SEGJ Conference; PB: 502 p.; Butsuri tansa gakkai dai 96 kai (1997 nendo shunki) gakujutsu koenkai koen ronbunshu ER -