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| Strata Behaviors Laws Under the Condition of Thick Sandstone Roof Weakening |
| LI Chunjia1, SHEN Mengfei2,3 |
1. Xinji No.2 Coal Mine, SDIC Xinji Energy AG, Huainan 232172, China;
2. School of Energy and Safety Engineering, Anhui University of Science and Technology, Huainan 232001, China;
3. Provincial and MOE Joint Key Laboratory of Mine Safety and High Efficient Mining, Anhui University of Science and Technology, Huainan 232001, China |
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Abstract: With the fully mechanized coal mine surface of a mine 210108 as the object of research, in view of the fact that the working face is hard and the natural caving roof is not easy to colapse, in order to determine its characteristics under the condition of the mine, an observation scheme is devised for the thick sand roof under the condition of the deep hole blasting weakening the mineral pressure. Based on the measured data and the daily field pressure analysis, the pressure characteristics, the stope roof activity and the abutment pressure distribution are studied, and analyzed during the first weighting and periodic changes of the support load. It is shown that under the condition of hard roof weakening, an understanding of the mine pressure variation law is of great significance to safety and efficiency of the working face mining.
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Received: 29 August 2013
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2014, Vol. 32 
