Characteristics Analysis of Generalized Rock Quality Designation (RQD) Based on Degree of Joint Development

Table 2

Parameters of 3D fracture network.

Group	Structure occurrence			Spacing distribution	Volume density
	Occurrence	Distribution	K value
Set 1	190°∠50°	Fisher	50	Negative index	Cp3/Sf
Set 2	238°∠37°	Fisher	20	Negative index
Set 3	64°∠78°	Fisher	5	Negative index

Note: C_p3 is a constant and S_f is the spacing between structural planes.