Research on Risk Identification of Coal and Gas Outburst Based on PSO-CSA

Table 1

Prediction index and critical value of coal seam outburst risk.

Drilling cuttings weight (S)			Cuttings gas desorption index K1	Initial velocity gas emission index Δp	The danger of coal and gas outburst
kg/m	L/m	mL/(g·min^1/2)		mmHg
≥6	≥5.4	≥0.5		≥10	With
<6	<5.4	<0.5		<10	Without