Correlation between the Joint Roughness Coefficient and Rock Joint Statistical Parameters at Different Sampling Intervals

Table 1

Relationship between JRC and Z₂.

No.	Sampling interval (mm)	Fitting relationship		Reference	Model
1	0.25	JRC = −16.99 + 56.15	0.967	[8]	JRC = a + b
	0.5	JRC = −14.83 + 54.42	0.973
2	0.25	JRC = 28.43 + 28.10 lg(Z2)	0.951	[8]	JRC = a + b lg(Z2)
	0.5	JRC = 32.20 + 32.47 lg(Z2)	0.973	[7]
		JRC = 32.69 + 32.98 lg(Z2)	0.993	[9, 10]
	1	JRC = 27.25 + 22.70 lg(Z2)	0.938	[20]
	2	JRC = 27.62 + 21.19 lg(Z2)	0.938
	4	JRC = 28.40 + 19.90 lg(Z2)	0.947
3	0.25	JRC = −4.51 + 60.32Z2	0.968	[8]	JRC = a + b(Z2)
	0.5	JRC = −3.47 + 61.79Z2	0.973	[8]
	1	JRC = −2.31 + 64.22Z2	0.983	[8]
		JRC = −2.044 + 60.68Z2	0.966	[20]
	2	JRC = −1.562 + 67.53Z2	0.972	[20]
	4	JRC = −0.732 + 75.80Z2	0.956
4	0.25	JRC = −5.06 + 64.28 tan(Z2)	0.969		JRC = a + b tan(Z2)
	0.5	JRC = −3.88 + 65.18 tan(Z2)	0.975	[8]
	1	JRC = −2.57 + 66.86 tan(Z2)	0.983
5	0.5	JRC = −5.05 + 1.20 tan^−1(Z2)	0.973	[7]	JRC = a + b tan^−1(Z2)
	0.25	JRC = −2.30 + 116.3(Z2)^2	0.929
6	0.5	JRC = −2.73 + 130.87(Z2)^2	0.934	[8]	JRC = a + b(Z2)^c
	1	JRC = −3.00 + 157(Z2)^2	0.945