Observation of Coal Wall Spalling in Coal Face with Large Mining Height and Its Control Measures

In order to deeply study the occurrence mechanism of coal wall spalling in the working face with large mining height and make it under control, the laser ranging method was used for observing the coal wall spalling in 3207 working face in Huoerxinhe Mine, statistics were made on the coal wall spalling depth, height, scope and so on, analysis was carried out on the causes of the coal wall spalling in 3207 working face and corresponding control measures were proposed. The study results showed that the coal wall spalling in 3207 working face in Huoerxinhe Mine was mainly in shearing slip form, and the periodical weighting in the working face had greater impact on the coal wall stability; the geological structure, the lithological characters of roof and floor strata, the mining height and the advancing speed of the working face were the main factors affecting the coal wall spalling; the control measures of using pitching oblique mining, reinforcing the coal wall of the working face, accelerating the advancing speed of the face and so on were proposed so as to ensure the safe and efficient mining of 3207 working face with large mining height.