Model Test Study on Overburden Failure and Fracture Evolution Characteristics of Deep Stope with Variable Length

Table 1

The comparison table of the field conditions of working face and simulation parameter.

Prototype parameters				Model parameter
Rock name	Thickness (m)	Compressive strength (MPa)	Volumetric weight (kg/m^3)	Thickness (cm)	Compressive strength (MPa)	Volumetric weight (kg/m^3)	Material ratio	Water ratio
Gravel stratum	16.3	140.13	2894	10.9	0.78	1608	9 : 0.5 : 0.5	1/10
Sandy mudstone	21.9	21.06	2538	14.6	0.12	1410	8 : 0.7 : 0.3	1/10
Medium sandstone	2.1	137.68	3390	1.4	0.76	1883	5 : 0.6 : 0.4	1/10
Spotted mudstone	10.2	34.72	2568	6.8	0.19	1427	9 : 0.7 : 0.3	1/10
Medium sandstone	3.2	129.60	3410	2.1	0.72	1894	5 : 0.6 : 0.4	1/10
Sandy mudstone	14.7	20.89	2507	9.8	0.12	1393	8 : 0.7 : 0.3	1/10
Fine sandstone	9.2	113.85	3143	6.1	0.63	1746	6 : 0.6 : 0.4	1/10
Sandy mudstone	9.4	27.53	2564	6.3	0.15	1425	8 : 0.7 : 0.3	1/10
Fine sandstone	10.3	108.62	2920	6.9	0.60	1622	6 : 0.6 : 0.4	1/10
Sandy mudstone	2.1	30.59	2550	1.4	0.18	1417	8 : 0.7 : 0.3	1/10
Sandstone	1.6	91.24	2815	1.1	0.51	1564	5 : 0.6 : 0.4	1/10
Shale	1.8	41.73	2595	1.2	0.23	1442	7 : 0.7 : 0.3	1/10
13-1 coal seam	3.9	8.2	1326	2.6	0.05	737	10 : 0.5 : 0.5	1/10
Mudstone	4.1	28.24	2638	2.7	0.16	1465	7 : 0.7 : 0.3	1/10
Sandy mudstone	7.2	27.89	2520	4.8	0.15	1400	8 : 0.7 : 0.3	1/10
Medium sandstone	16.1	141.76	3426	10.7	0.79	1903	5 : 0.6 : 0.4	1/10
Mudstone	15.0	29.62	2530	10.0	0.17	1406	8 : 0.7 : 0.3	1/10