Research on Optimization of Coal Pressure Relief Borehole Parameters under High-Stress Conditions

Table 3

Plastic zone connection of pressure relief boreholes with different diameters.

Borehole diameter (mm)	Connection status of the plastic zone of single-row arrangement	Connection status of the plastic zone of three-flower arrangement	Connection status of the plastic zone of double-row arrangement
100	y	n	n
120	y	n	n
140	y	n	n
160	y	n	n
180	y	n	n
200	y	n	n