Research Article

Movement Laws of Overlying Strata above a Fully Mechanized Coal Mining Face Backfilled with Gangue: A Case Study in Jiulishan Coal Mine in Henan Province, China

Table 1

Mechanical parameters of rock samples.

StrataCompressive strength (MPa)Elastic modulus (GPa)Poisson’s ratioCohesion (MPa)Angle of internal friction (°)Protodyakonov coefficientDeformation modulus (GPa)

Sandstone5.9069.800.1639.4835.309.309.20
Mudstone3.2538.900.2147.0929.205.587.40