The dust concentration at each monitoring section near the working face gradually rises with time until the peak under the coupling effect of the wind flow field and then decreases with a decreasing trend of decreasing rate, and the monitoring section concentration at the working face under the slope of − 9%, − 6%, − 3%, 0%, 3%, 6%, and 9% working conditions reaches the specified threshold value with return air velocity increments of 350 s, 370 s, 370 s, 390 s, 400 s, 440 s, 480 s respectively.
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Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting.
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