Research and Application of Prefilled Concrete Wall to Reduce the Size of Stopping Mining Coal Pillar

Table 5

Mechanical parameters of rock strata.

Lithology	Density kg/m^-3	Bulk modulus/GPa	Shear modulus/GPa	Cohesion/MPa	Internal friction angle/°	Tensile strength/MPa
Siltstone	2500	5.56	3.82	1.5	34	2.02
Kaolin	2500	1.82	1.04	0.42	33	1.2
Sandy mudstone	2400	4.85	2.91	1.58	33	1.75
Sandstone	2500	7.42	5.33	2	34	4.07
Sandy mudstone	2400	4.85	2.91	1.58	33	1.75
Kaolin	2500	1.82	1.04	0.42	33	1.2
Sandstone	2500	5.56	3.82	1.5	34	2.02
Sandy mudstone	2400	4.85	2.91	1.58	33	1.75
Coal	1440	0.8	0.5	1.7	28	0.4
Grit stone	2300	5.32	3.78	2.5	31	3.1
Fine sandstone	2520	3.14	1.71	1.91	35	2.9
Filling body	2456	6.58	4.51	3.33	44	2.1