| 摘要 |
The disclosed method introduces a pressure effectivity factor h, so as to continuously determine fracture toughness KIC of rock during core boring by using the equation of KIC=0.346 2ROOT N/ epsilon LxhQ/B; and here, N is the revolving speed of a coring bit, Q is the pressure supplied to it, L is its drilling speed, B is the width of its bit face, and epsilon is the number of rows of its face stones. The pressure effectivity factor h is predetermined by using both a core whose fracture toughness is measured by the ISRM (International Society for Rock Mechanics) method and the above constants which are used in boring the core.
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