A Shear Strength Model for a Subsidence Backfill Body Based on Adhesion Friction Theory

Table 1

Results of the shear strength test (kPa).

Waste rock proportion (%)	Grain size (mm)	Vertical pressure (kPa)				c (kPa)	φ (°)
		100	200	300	400
40	−20	167	245	341	444	67.3	42.8
	−15	158	220	335	408	64.3	40.8
	−10	144	236	305	399	50.7	40.6
30	−20	153	239	338	436	54.3	43.5
	−15	144	215	329	401	51	41.5
	−10	132	187	277	353	48.5	37
20	−20	144	235	308	367	77.5	36.6
	−15	142	214	276	344	77.3	33.7
	−10	139	189	265	329	68.7	32.9
10	−20	157	241	317	388	83.2	37.5
	−15	150	236	290	369	83.8	35.3
	−10	147	212	272	330	87.5	31.4