摘要 |
Disclosed is a method and apparatus for measuring in-situ stress in rock using a thermal crack. The method involves forming a borehole (4), cooling a wall (w) of the borehole, applying tensile thermal stress, forming a crack in the borehole wall, and measuring temperature and cracking point. Afterwards, the borehole wall is heated to close the formed crack, the borehole wall is cooled again to re-open the crack, and temperature is measured when the crack is re-opened. The in-situ stress of the rock is calculated using a first cracking temperature at which the crack is formed and a second cracking temperature at which the crack is re-opened. Further, the apparatus cools, heats and re-cools the borehole wall, thereby measuring the first cracking temperature, the second cracking temperature, and the cracking point.
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申请人 |
KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES |
发明人 |
RYU, CHANG-HA;RYU, DONG-WOO;CHOI, BYUNG-HEE;JOHN, LOUI PORATHUR;SYNN, JUNG-HO |