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| Study on soft support technology for roadway instability caused by gun vibration |
| Study on soft support technology for roadway instability caused by gun vibration |
| Datong Coal Group Meiyukou Ming Engineering Area, Datong 037000, China |
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Abstract Based on stability of coal mine roadway caused by gun vibration, basic causes of impact pressure were analyzed theoretically. According to specific mining situation of Zhaogezhuang Mine, finite difference system FLAC2D was used to study deformation of roadway under influence of blasting vibration in relative conditions with no support mode and two kinds of flexible support mode. The results showed that blasting vibration increased load of rock strata around roadway and shock waves were caused by cracks in surrounding rock strata and friction occurred between coal seam and roof and floor, which reduced strength of surrounding rock mass; Flexible support method could effectively absorb energy of blasting vibration and reduce roadway shape variables; Under influence of blasting and mining, the u-shaped steel retractable bracket was slightly better than anchor net support mode.
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