Effects of Water Immersion on the Long-Term Bearing Characteristics of Crushed Gangue in Goaf

Table 5

Grain size distribution and fractal dimensions of crushed sandstone with different grain compositions before and after compression (axial stress of 3.5 MPa).

	State	Quality (kg)
		0~10 mm	10~20 mm	20~30 mm	30~40 mm	40~50 mm	50~60 mm
0.3	Before compression	36.22	8.37	5.77	4.54	3.80	3.31	2.7000	0.0338
	After compression	38.59	7.78	5.14	3.89	4.28	2.32	2.7338
0.5	Before compression	25.31	10.48	8.05	6.78	5.98	5.40	2.5000	0.0914
	After compression	29.68	10.16	6.98	5.37	5.32	4.50	2.5914
0.7	Before compression	17.69	11.05	9.43	8.51	7.89	7.43	2.3000	0.1766
	After compression	24.45	10.66	8.18	6.68	7.65	4.36	2.4766