Numerical Simulation of Empty-Hole Effect during Parallel-Hole Cutting under Different In Situ Stress Conditions

Table 1

Quartz rock mechanical parameters [26].

Poisson’s ratio	Density	Elastic modulus (GPa)	Compressive strength (MPa)	Tensile strength (MPa)	Longitudinal wave velocity
0.21	2790 kg/m³	23.03	17.40	3.06	5000 m/s