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

Table 4

Relationship between JRC, Z₂, and Δx.

Number	Model	Empirical formula
1	JRC = a + b	JRC = −13.96Δx^−0.24 + 55.90Δx^0.01
2	JRC = a + b lg(Z2)	JRC = 0.03Δx^0.04 + 25.12Δx^−0.18lg(Z2)
3	JRC = a + bZ2	JRC = 5.75Δx^−0.41 + 70.28Δx^0.09Z2
4	JRC = a + b tan(Z2)	JRC = −2.58Δx^−0.40 + 67.19Δx^0.11tan(Z2)