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25 <br />-50- <br />d? <br />a? <br />0 <br />N 20 <br />c <br />0 <br />v <br />15 <br />0 <br />v <br />v <br />C <br />v <br />10 <br />a? <br />v? <br />c <br />a <br /> <br />JRC 2 S0; x 0.87 <br />G. <br />a <br />0le <br />0 <br />5 10 15 20 25 <br />Joint Roughness Coefficient, JRC <br />Figure 2.13 Correlation of Joint Roughness <br />Coefficient with Dilation Angle <br />(Williams, 1980, p. 89)