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Jiaozuo, China

Zhang R.-L.,Henan Polytechnic University | Wang Z.-J.,Henan Polytechnic University | Chen J.-W.,Jiaozuo Coal Company
Safety Science | Year: 2012

Permeability of coal seam is extremely sensitive to the in situ stress loaded. The techniques of "Pressure relief" have been proved significantly effective in practice to improve the gas permeability and the gas extraction rate to the soft coal seam. It is very necessary to make clear of the variational characteristics of the stress distribution in front of coal mining face with the production process. The vertical stress values of the top and bottom layer of the coal seam at different distances in front of the coal face are respectively measured, and the corresponding curves of the vertical stress variation along the mining direction have been obtained. According to the research conclusions in this paper, some available technical measures of "Pressure relief" at different distances and different layers of soft coal seam in front of mining face, are expected to make and to put into practice. The research methods and correlative data included in this paper also can be referred to conduct some further and deep-seated exploration to get new theories and practical techniques for the gas drainage of the soft and low permeability coal seam. © 2011 Elsevier Ltd. Source

Jia M.-K.,China University of Mining and Technology | Jia M.-K.,Jiaozuo Coal Company
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

According to the geological condition of buried deep with thin bedrock coal seam in the 11011 working face of Zhao-Gu No.1 coal mine, the paper discussed the conditions of thin bedrock water gushing and running sand coal seam by using the coal mine field investigating and statistical analysis method. After analyzing and calculating the working face roof's structure instability mode by using the theories of 'masonry beam' and 'step beam' we have analyzed the overlying strata damage, migration evolution rule of fractures. The results show that and the height of the working face roof water fracture zones is about 48 m. Therefore, some preventive suggestions and measures have to been taken into practice when mining a coal within such a range. The measures can also guide other coal mines with similar geological condition. Source

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