Table 3. Inversion Parameters of the Cole–Cole Model for Complex Electrical Dispersion Curves of Coal in Different Directions.

fracture structure	axial pressure/MPa	confining pressure/MPa	ρ(0)/kΩ·m	R1 kΩ·m	R2/kΩ·m	R3/kΩ·m	Xc/μF	c	R2
x	1	5	1.671	0.241	1.56 × 10–12	0.368	1.331 × 10–1	0.584	0.996
	3	5	1.555	0.31	6.836 × 10–32	0.312	9.901 × 10–2	0.545	0.996
	5	5	1.471	0.356	5.593 × 10–29	0.268	8.588 × 10–2	0.514	0.996
	7	5	1.434	0.397	1.588 × 10–132	0.226	8.223 × 10–2	0.423	0.988
y	1	5	1.834	0.282	1.068 × 10–12	0.506	1.776 × 10–1	0.422	0.986
	3	5	1.754	0.322	6.515 × 10–33	0.406	1.301 × 10–1	0.411	0.99
	5	5	1.707	0.386	2.25 × 10–67	0.354	1.058 × 10–1	0.448	0.993
	7	5	1.673	0.433	1.673 × 10–156	0.336	9.955 × 10–2	0.437	0.995
z	1	5	2.256	0.326	6.47 × 10–14	0.842	4.515 × 10–1	0.537	0.989
	3	5	2.148	0.468	2.881 × 10–29	0.682	2.736 × 10–1	0.525	0.992
	5	5	2.036	0.772	2.253 × 10–56	0.613	1.926 × 10–1	0.507	0.987
	7	5	1.976	0.988	1.671 × 10–121	0.589	1.584 × 10–1	0.505	0.992