Structure and deformation measurements of shallow overburden during top coal caving longwall mining |
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| Affiliation: | 1. College of Mining, Liaoning Technical University, Fuxin 123000, China;2. State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines, Henan Polytechnic University, Jiaozuo 454003, China;3. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221116, China;4. Chengyi Coal Mine, Inner Mongolia Yitai Coal Co., Ltd., Ordos 017000, China |
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| Abstract: | Mining induced pressures are strong and overburden failure areas are large in top coal caving longwall mining, which constrains high production and safety mining. By employing the combination of the full view borehole photography technique and the seismic CT scanner technique, the deformation and failure of overlying strata of fully mechanized caving face in shallow coal seam were studied and the failure development of overburden was determined. Results show that the full view borehole photography can reveal the characteristics of strata, and the seismic CT scanner can reflect the characteristics of strata between the boreholes. The combined measurement technique can effectively determine the height of fractured and caved zones. The top end of the caved zone in Yangwangou coal mine employing the top coal caving longwall mining was at the depth of 171 m and fractured zone was at the depth of 106-110 m. The results provide a theoretic foundation for controlling the overburden strata in the shallow buried top coal caving panel. |
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| Keywords: | Top coal caving Shallow depth Overburden failure and deformation Full view borehole photography Seismic CT scanner |
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