Technology of Bump Prevention to High Stress Coal Pillar Under Deep Ultra Thick Conglomerate Stratum

In order to solve the mine pressure bump problem occurred in the coal mining face near the high stress coal pillar under deep ultra thick conglomerate st ratum, based on the coal pillars left by No.2410 Coal Mining Face and No. 2409 Coal Mining Face in Huafeng Mine as a study object, by view of a mining and excavati on layout, in- situ stress and mining stress, the paper analyzed the influences of the mine pressure bump caused. The results showed that No.2410 Coal Mining Face h ad a high mine pressure bump danger when the coal mining face passed through coal pillars of No.2409 Coal Mining Face and some area would have high mine press ure bump danger. The mine pressure bump under the such condition was the high stress pressure bump formed in the left coal pillar or area around the sectional coal p illar and meanwhile with the stability lost in the coal pillar or the movement of the ultra thick conglomerate caused by the mining operation, the danger of the mine press ure bump would be occurred by a mine seismic. The bump prevention measures of a mine pressure releasing and driving simultaneously and mainly with a large diamet er borehole for the pressure releasing during the gateway driving period and the bump prevention measures with several high density pressure releasing in the coal pill ars during the mining period of the coal mining face were provided. The coal dust monitoring and measuring, micro- seismic monitoring and other methods were applied to comprehensively monitor the mine pressure bump in order to reduce the danger of the mine pressure bump.