Study on Prediction of Coal-Gas Compound Dynamic Disaster Based on GRA-PCA-BP Model

Table 6

Composition matrix.

	Component
	Buried depth	0.576	0.009	-0.661	-0.05
Change of soft stratification	0.202	0.286	0.617	0.518
Surrounding rock combination	-0.214	0.235	-0.49	0.762
Coal failure type	0.844	-0.198	0.145	0.119
Coal thickness	0.104	0.717	0.346	-0.19
Coal seam dip angle	-0.098	-0.816	0.328	0.17
Initial velocity of gas emission	0.892	0.082	-0.022	-0.133
Coal firmness coefficient	-0.778	0.095	-0.057	-0.183