Similar Material Simulation Study on Protection Effect of Steeply Inclined Upper Protective Layer Mining with Varying Interlayer Distances

Table 3

Sixteen combinations and mechanical parameters of similar materials.

Experimental number	Sand-binder ratio	Density (kg·m^−3)	Residual water content (%)	Compressive strength (MPa)	Elastic modulus (MPa)	Poisson’s ratio
1	6	1550	5	0.442	91.23	0.251
2	6	1600	3	0.504	81.67	0.254
3	6	1650	2	0.821	217.83	0.213
4	6	1700	1	1.202	261.84	0.243
5	8	1550	3	0.270	48.75	0.235
6	8	1600	5	0.416	74.36	0.296
7	8	1650	1	0.572	96.42	0.194
8	8	1700	2	0.731	166.22	0.284
9	10	1550	2	0.315	59.22	0.190
10	10	1600	1	0.333	65.51	0.186
11	10	1650	5	0.181	27.36	0.311
12	10	1700	3	0.354	53.88	0.316
13	12	1550	1	0.193	47.02	0.149
14	12	1600	2	0.206	38.50	0.202
15	12	1650	3	0.239	40.60	0.286
16	12	1700	5	0.267	43.84	0.343