Theory and practice of air flow direction prediction after tunnel penetration

doi:10.16265/j.cnki.issn 1003-3033.2021.S1.027

Abstract

Abstract: In order to prevent gas accidents after tunnels in coal mines were penetrated, influence of tunnels on air flow direction was studied by utilizing energy conservation law and energy equation theory. Then, based on variance characteristics of static air pressure, velocity pressure and potential pressure in flow process, an equation for total energy of air flowing through any roadway section in process of ventilation was established by using fluid energy balance equation, and air flow direction predication theory after roadway penetration was developed before two methods for measuring wind pressure energy under different piercing conditions were given. Finally, with Tunbao coal mine as an example, verification and analysis were conducted. The results show that the prediction theory constructed in this paper can accurately determine air flow direction after roadway penetration in coal mines, thus reducing gas accidents and improving mine ventilation management.

Key words: roadway penetration, air flow direction, prediction theory, energy equation, wind pressure energy

CLC Number:

X936

CHU Xinlong, CAO Zhigang, ZHAO Kai. Theory and practice of air flow direction prediction after tunnel penetration[J]. China Safety Science Journal, 2021, 31(S1): 154-158.

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