The Effect of a Tectonic Stress Field on Coal and Gas Outbursts

Table 2

Conditions of ground stress and coal gas in the model.

Case	Ground stress in each direction*			Initial gas pressure in coal seam/MPa
	𝑋 direction	𝑌 direction	𝑍 direction	I	II	III
1	Slip boundary		1	0	0.8	1.5
2	0.5	1.5	1
3	1.5	0.5	1
4	1.5	2	1
5	2	1.5	1

∗The values of ground stress in the table are shown with 10 MPa as a reference.