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| EFFECT OF GEOSTRESS ON COAL AND GAS OUTBURST IN THE UNCOVERING TECTONIC SOFT COAL BY CROSS-CUT |
| GAO Kui1，2，LIU Zegong1，2，LIU Jian1，2 |
| (1. Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Province and Education Ministry，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. School of Energy and Safety，Anhui University of Science and Technology，Huainan，Anhui 232001，China) |
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Abstract An experimental platform to simulate the coal and gas outburst of large scale coal uncovering by cross-cut was built in laboratory based on the similarity laws and geological mechanics. The laboratory model tests and the numerical calculations were carried out to simulate the process of soft coal uncovering by cross-cut. Stress concentration exists in the surrounding rock ahead of the working face in the process of tunnel excavation. The elastic potential energy is accumulated in coal because of the stress concentration，which is the energy preparation and inoculation for outburst. The tectonic stress concentration area occurs in the vicinity of geological structure faults. The concentrated tectonic stress and the concentrated stress due to excavation superposed together lead to deeper and larger outburst in soft coal.
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Received: 03 January 2014
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2015, Vol. 34 
