Research on Arch Model and Numerical Simulation of Critical Water and Sand Inrush in Coal Mine near Unconsolidated Layers

Table 1

Main conditions and parameters of simulation.

Size of the cabin (m)	Particle size (m)	Particle normal bond strength (N)	Tangential bond strength (N)	Initial porosity rate	Particle normal stiffness (N·m^-1)	Particle tangential stiffness (N·m^-1)
	0.01 m	0	0	0.15	10^9	10^9