Experimental Study on the Fractal Features and Permeability Characteristics of Low Metamorphic Coal Pore Structure under Thermal Damage

Table 4

Calculation results of , , , and .

Temperature/°C	The theoretical fractal dimension of the pore volume
	XG-1	XG-2	HS-1	HS-2
50	2.0276	2.0206	2.2192	2.1367
100	2.1059	2.0473	2.2234	2.1394
200	2.1452	2.1301	2.3303	2.2777
300	2.2470	2.2278	2.4940	2.4841
Temperature/°C	The average tortuosity
	XG-1	XG-2	HS-1	HS-2
50	51.8487	46.2035	18.5982	27.0158
100	35.8153	40.8937	18.2500	26.6839
200	29.1644	28.0406	11.3033	14.2992
300	18.4683	18.0048	5.5266	5.7652
Temperature/°C	The tortuous fractal dimension
	XG-1	XG-2	HS-1	HS-2
50	2.5942	2.5966	2.4746	2.5246
100	2.5461	2.5802	2.4694	2.5229
200	2.5185	2.5289	2.3998	2.4344
300	2.4569	2.4667	2.2905	2.2988
	The maximum pore radius /μm
XG-1	XG-2	HS-1		HS-2
24.66	18.65	49.54		56.96