Analysis of Thermal Environment and Its Influencing Factors in Deep Stope of Metal Mine

Table 7

Weight calculation and ranking of deep stope thermal environment indicators.

Secondary indicators	Entropy	Weight
L— Length of excavation face, m	0.99974	0.00324
U— Perimeter of roadway, m	0.99963	0.00450
tcs— Initial temperature of surrounding rock, °C	0.99973	0.00335
tpj—Average temperature of air flow, °C	0.99953	0.00585
Mw—Water inflow, kg·h^-1	0.96698	0.40661
twH—Initial temperature of water, °C	0.99974	0.00324
twK—Final temperature of water, °C	0.99974	0.02401
G—Mass flow of air flow, kg·s^-1	0.99805	0.02401
△Z—Difference between air inlet and bottom elevation, m	0.99047	0.11733
η— Efficiency of electromechanical equipment, %	0.99974	0.00324
N— Power of electromechanical equipment, kW	0.99974	0.00324
n—The number of equipment	0.99974	0.00324
Cm—Specific heat capacity of ore, KJ/(kg·°C)	0.99974	0.00324
△t—Temperature difference between ore and air, °C	0.98261	0.21416
Ms— Surface area of filling body during one-time filling, m^2	0.99139	0.10603
n—The number of worker at the working face	0.99726	0.03379
Gh—Daily gunpowder consumption, kg·d^-1	0.99499	0.06170