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Method for determining fracture toughness of rock by core boring
Method for determining fracture toughness of rock by core boring
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机译:用岩心钻孔测定岩石断裂韧性的方法
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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√·hQ/B ; andhere, 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 ε 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 said core.
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机译:所公开的方法引入了压力影响因子h,从而通过使用以下公式连续确定岩心钻进过程中岩石的断裂韧性K IC Sub>。K IC Sub> =0.346√<图像文件=“ IMGA0001.GIF” he =“ 5” id =“ ia01” imgContent =“字符” imgFormat =“ GIF” inline =“ yes” wi =“ 12 “ />·hQ / B;和在这里,N是取芯钻头的旋转速度,Q是提供给它的压力,L是其钻孔速度,B是其钻头端面的宽度,而ε是其表石的排数。通过使用其断裂韧性通过ISRM(国际岩石力学学会)方法测量的岩心和用于钻孔所述岩心的上述常数两者来预定压力影响因子h。
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