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| Study on forced caving technology of hard thick layer K2 limestone roof in Tiexin Coal Industry |
| Du Wei |
| Shanxi Baoli Tiexin Coal Industry Co., Ltd., Jinzhong 031302, China |
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Abstract In order to solve the problem of K2 limestone roof hanging at the end of fully mechanized mining face in No.9 coal seam of Tiexin Coal Industry, taking No. 9226 Face mining as the engineering background, the forced caving technology of hard and thick K2 limestone roof is studied. According to the actual conditions of No. 9226 Face, the parameters of fracturing drilling are designed, and the construction scheme of small aperture directional pre-splitting is put forward. The effect of pre-splitting and roof control is monitored and evaluated by drilling peep and the length of hanging roof at the end of working face. The practice shows that the suspended roof distance at the end of No. 9226 Face is reduced from 10 ~ 30 m before fracturing to less than 5 m, and the suspended roof problem is effectively controlled to ensure the production safety of the working face.
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