中国矿山工程

As shock wave is formed due to the roof caving in goaf, a research was carried out based on a mine to analyze the two types of roof caving, namely, “inflator” and “surrounding flow”. By analysis, the goaf roof caving was determined to be “surrounding flow” type, the maximum airspeeds caused by block caving and overall roof caving were calculated to be 0.47m/s and 37.77m/s respectively in theory. It was found that the airflow 4m from the edge of collapsed blocks did no harm to human body. The above analysis has provided guidance for addressing goaf roof caving.