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| Research on stress appearance and unloading prevention control technology of igneous rock roof mining roadway |
| Li Fuqiang, Li Hanming, Zhou Yunshuai |
| Hongyang Third Mine, Shenyang Coking Coal Co., Ltd., Shenyang 110000, China |
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Abstract As a typical source of rock burst, the roof-type rock burst is primarily prevented and controlled by the unloading-supporting collaboration method, which represents the current mainstream technical approach. Based on the occurrence characteristics of igneous rock in the roof during the final mining phase of No. 703 Face in the Xisan Upper Mining Area of Hongyang Third Mine, a FLAC3D numerical model was established conform to the actual engineering geological conditions. The model was employed to investigate and analyze the advance stress distribution law of the mining roadway. Subsequently, a set of unloading-supporting prevention and control measures for mining roadways under igneous rock roofs was designed and further applied in on-site engineering practice. The research results indicated that: In the absence of prevention and control measures, a sharp surge in the advance stress of the roadway was observed, with a stress increase rate of approximately 23.0%;The optimal unloading-supporting prevention and control measures suitable for the roadway of No. 703 working face were determined as full roof cable support combined with pressure-relief boreholes penetrating the igneous rock roof on the production side; After the implementation of the aforementioned prevention and control measures, the total microseismic energy in the working face decreased by about 33.4%, the microseismic frequency was significantly reduced, and the stability of the roof surrounding rock was remarkably enhanced.
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