Determination of the Height of Overburden Water-Conducting Fracture Zone in 215102 Working Face of Yue Nan Coal Mine

Table 1

Physical and mechanical parameters of overburden in 215102 working face.

Rock stratum name	Layer number	Layer thickness/m	Density/(kg/m^3)	Elastic modulus/GPa	Poisson ratio	Bulk modulus/GPa	Shear modulus/GPa	Cohesion/MPa	Internal friction angle/(°)	Tensile strength/MPa
Sandy mudstone	15	31.83	2510	14.53	0.147	2.56	2.36	2.16	36	1.25
3# coal seam	14	6.25	1800	3.48	0.22	2.5	1.72	1.9	21	0.21
Sandy mudstone/mudstone	13	8.3	2530	10.85	0.147	5.12	4.73	2.45	40	2.01
Fine sandstone	12	2.5	2300	6.77	0.25	2.7	1.6	2	35	1
Sandy mudstone	11	2.91	2510	14.53	0.147	2.56	2.36	2.16	36	1.25
Sandy mudstone/mudstone	10	9.04	2530	10.85	0.147	5.12	4.73	2.45	40	2.01
Limestone	9	3.26	2800	10.69	0.18	5.57	4.53	11.4	38	6.7
Sandy mudstone	8	20.05	2510	14.53	0.147	2.56	2.36	2.16	36	1.25
9# coal seam	7	1.02	1800	3.48	0.22	2.5	1.72	1.9	21	0.21
Sandy mudstone	6	7.77	2510	14.53	0.147	2.56	2.36	2.16	36	1.25
Siltstone	5	11.09	2400	15	0.2	5	3.8	6	35	2.5
13# coal seam	4	0.38	1800	3.48	0.22	2.5	1.72	1.9	21	0.21
Sandy mudstone	3	5.34	2510	14.53	0.147	2.56	2.36	2.16	36	1.25
Limestone	2	9.13	2800	10.69	0.18	5.57	4.53	11.4	38	6.7
Mudstone	1	0.31	2200	16.05	0.23	4.3	2.8	0.7	30	1.8
15# coal seam	0	4	1800	3.48	0.22	2.5	1.72	1.9	21	0.21
Mudstone	—	4.69	2200	16.05	0.23	4.3	2.8	0.7	30	1.8
Fine sandstone	—	1.21	2300	6.77	0.25	2.7	1.6	2	35	1
Siltstone	—	20	2400	15	0.2	5	3.8	6	35	2.5