Fig. 9
Experimental figure of mechanical parameter testing. The mechanical parameters of each rock layer in the model were derived experimentally. Through uniaxial compression tests, the axial stress-strain curves were measured to calculate Young’s modulus and Poisson’s ratio. These values were then used to derive the bulk modulus and shear modulus. Additionally, the internal friction angle and cohesion of the coal-rock mass were determined via direct shear tests. The parameter settings were obtained from the rock mechanics experimental data provided by the coal mine, and the final rock mechanics parameters were determined by averaging the measured surrounding rock mechanics parameters, with some adjustments for consistency. Determination of rock tensile strength through the Brazilian test.
