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

Table 4

Grain size distribution and fractal dimensions of crushed sandstone samples of different axial stresses before and after compression.

Axial stress	State	Quality (kg)
		0~10 mm	10~20 mm	20~30 mm	30~40 mm	40~50 mm	50~60 mm
1.50 MPa	Before compression	25.31	10.48	8.05	6.78	5.98	5.40	2.5000	0.0531
	After compression	26.83	11.05	7.71	6.04	5.88	4.49	2.5531
3.50 MPa	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
5.50 MPa	Before compression	25.31	10.48	8.05	6.78	5.98	5.40	2.5000	0.1184
	After compression	31.85	6.86	7.32	6.72	5.14	4.11	2.6184
7.50 MPa	Before compression	25.31	10.48	8.05	6.78	5.98	5.40	2.5000	0.1481
	After compression	33.07	8.73	6.12	5.57	4.73	3.78	2.6481