Research Article

A Study of Fractal Deep-Hole Blasting and Its Induced Stress Behavior of Hard Roof Strata in Bayangaole Coal Mine, China

Table 2

#311103 working face key strata calculation statistics table.

Type of rockThickness of each layer hi (m)Volume force γi (kN/m3)Elastic modulus Ei (GPa)Calculated result

Medium-grain sandstone13.452323326.16The key strata
Fine grain sandstone3.52421380.69
Medium-grain sandstone12.962323298.08The key strata
Sandy mudstone12.22515