采空区瓦斯移动规律与瓦斯抽放孔位置关系外文文献翻译、中英文翻译、外文翻译.docxVIP

英文原文 Methane moving law with long gas extraction holes in goaf Yong ZHANG, Xibin ZHANG*,Chunyuan LI, Chuanan LIU, Zufa WANG Faculty of Resources and Safety Engineering, China University of Ming Technology, Beijing 100083, China Abstract In order to grasp the methane moving law in goaf and provide a theoretical data for gas extraction holes, the height of caving and fractured zones in the stope has been calculated according to the experiential formula and gas movement law has been observed by field and laboratory experiment. It also gives gas moving characteristics with different position of extraction holes. And it has the best gas extraction result when the final holes are arranged around 30m above the coal seam and 10-20m away from the tailentry in horizontal direction. Besides, the height of final holes should be adjusted to the overburden strata structure. When final holes are near the tailentry, their height should be controlled in the upper of regular caving zone; when they are close to the center of face, their height should be controlled at the bottom of fracture zones. 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of China Academy of Safety Science and Technology, China University of Mining and Technology(Beijing), McGill University and University of Wollongong. Keywords: gas in goaf; gas movement;gas extraction holes; position of extraction holes; expe riment 1 Introduction The roof strata above the goaf will fracture and form the caving, fracture and bending zones in the vertical direction after mining the coal seam. And there are lots of fractures and cracks in caving and fracture zones, the permeability of the stratum are also high. According to the “O” circle theory of fracture distribution in the stope [1], the gas of goaf will move and gather up along those fractures and cracks. Then it is easier to cause the gas exceeding the limit, which need to take measures to reduce gas content. In order to solve this probl