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岩芯采样率和RQD(Core Recovery and Rock Quality Designation)

2012-05-12 19:08阅读：

http://blog.sina.cn/dpool/blog/u/1150196050

Total core recovery (TCR) is the borehole core recovery percentage.
TCR is defined as the quotient:
TCR = \left(\frac{l_{\mathrm{sum~of~pieces}}}{l_\mathrm{tot~core~run}}\right)\times 100 %
l_\mathrm{sum~of~pieces} = Sum of length of core pieces
l_\mathrm{tot~core~run}
Recovery and Rock Quality Designation)' /> = Total length of core runSolid core recovery (SCR) is the borehole core recovery percentage of solid, cylindrical, pieces of rock core.
SCR is defined as the quotient:
SCR = \left(\frac{l_{\mathrm{sum~of~solid~core~pieces}}}{l_{\mathrm{tot~core~run}}}\right)\times 100 %
l_{\mathrm{sum~of~solid~core~pieces}} = Sum of length of solid, cylindrical, core pieces
l_{\mathrm{tot~core~run}} = Total length of core run
RQD is defined as the quotient:
RQD = \left(\frac{l_{\mathrm{sum~of~100}}}{l_{\mathrm{tot~core~run}}}\right)\times 100 %
l_{\mathrm{sum~of~100}} = Sum of length of core sticks longer than 100 mm measured along the center line of the core
l_{\mathrm{tot~core~run}} = Total length of core run

Classification table

From the RQD index the rock mass can be classified as follows:
RQD Rock mass quality
<25% very poor
25-50% poor
50-75% fair
75-90% good
90-100% excellent
岩芯采样率和RQD(Core <wbr>Recovery <wbr>and <wbr>Rock <wbr>Quality <wbr>Designation)

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