Research on influences on gas emission characteristic of coal seam caused by penetration partings
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摘要: 利用自行研制开发的煤层瓦斯放散试验装置,以含透气夹矸层型煤试样为研究对象,以试样内瓦斯放散速度和累积放散量为研究参数,系统研究了透气夹矸层对煤层瓦斯放散特性的影响,并对瓦斯在含透气夹矸层煤层中的放散机理进行了分析探讨.结果表明:含透气夹矸试样与全煤试样瓦斯放散速度均随时间呈幂函数单调衰减,瓦斯累积放散量均随时间呈有上限的单调递增;瓦斯吸附平衡压力越大,瓦斯放散初速度越大,且相同时间段内瓦斯累积放散量越大;在相同吸附平衡压力下,含透气夹矸试样的瓦斯放散速度在初始10min内明显大于全煤试样,在30~90min之间两放散速度曲线出现交叉,而含透气夹矸试样的瓦斯累积放散量在前120min均大于全煤试样.透气夹矸层的存在增大了煤层的渗透率,为煤层中瓦斯放散提供了运移通道,创造了瓦斯放散的有利条件,使煤层的瓦斯放散效率得到提高.Abstract: Based on a self developed coal seam gas emission test device, taking briquette samples containing penetration partings as the research object, and taking gas emission speed and gas cumulative emission amount of coal sample as study parameters, the influences caused by penetration partings on coal seam were studied systematically, and the mechanism of gas emission of coal seam with penetration partings was discussed. The results show that the gas emission speed of all briquette specimens presents power function decay over time, and the cumulative emission amount presents an upper limit monotone increase over time. Both gas emission initial speed and cumulative emission amount of coal samples increase with the increase of adsorption equilibrium pressure. Under the same adsorption equilibrium pressure, the gas emission speed of specimens containing penetration partings is faster than the ordinary specimens in the initial stage, but two emission speed curves appear intersection from 30 min to 90 min, while the cumulative emission amount of specimens containing penetration partings is more than that of the ordinary specimens in the former 120 min. Penetration partings can improve the permeability of coal seam, provide migrations path for gas emission of coal seam, and create favorable conditions for the gas emission, so the gas emission efficiency is improved.
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[1] 周世宁, 林柏泉. 煤矿瓦斯动力灾害防治理论及控制技术[M]. 北京: 科学出版社, 2007.
[2] 聂百胜, 何学秋, 王恩元. 瓦斯气体在煤层中的扩散机理及模式[J]. 中国安全科学学报, 2000, 10(6): 27-31.Nie Baisheng, He Xueqiu, Wang Enyuan. Mechanism and modes of gas diffusion in coal seams[J]. China Safety Science Journal, 2000, 10(6): 27-31.
[3] 薛东杰. 不同开采条件下采动煤岩体瓦斯增透机理研究[D]. 北京: 中国矿业大学(北京), 2013.
[4] 俞启香. 矿井瓦斯防治[M]. 徐州: 中国矿业大学出版社, 1992: 18-36.
[5] 周世宁. 瓦斯在煤层中流动的机理[J]. 煤炭学报, 1990, 15(1): 15-24.Zhou Shining. Mechanism of gas flow in coal seams[J]. Journal of China Coal Society, 1990, 15(1): 15-24.
[6] 尹光志, 李广治, 赵洪宝,等. 煤岩全应力-应变过程中瓦斯流动特性试验研究[J]. 岩石力学与工程学报, 2010, 29(1): 170-175.Yin Guangzhi, Li Guangzhi, Zhao Hongbao, et al. Experimental research on gas flow properties of coal specimens in complete stressstrain process[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(1): 170-175.
[7] 赵洪宝, 李华华, 杜秋浩, 等. 含瓦斯煤样横向变形与瓦斯流动特性耦合关系试验研究[J]. 岩土力学, 2013, 34(12): 3384-3388, 3402.Zhao Hongbao, Li Huahua, Du Qiuhao, et al. Experimental study of coupling relationship between lateral strain of coal containing gas and characteristics of gas flow[J]. Rock and Soil Mechanics, 2013, 34(12): 3384-3388, 3402.
[8] 赵洪宝, 汪昕, 张鹏. 线弹性阶段卸轴压煤样内瓦斯流动特性试验研究[J]. 岩土力学, 2012, 33(5): 1347-1351.Zhao Hongbao, Wang Xin, Zhang Peng. Experimental study of gas flow characteristics of coal sample under unloading axial stress in linear elastic stage [J]. Rock and Soil Mechanics, 2012, 33(5): 1347-1351.
[9] 王兆丰. 空气、水和泥浆介质中煤的瓦斯解吸规律与应用研究[D]. 徐州: 中国矿业大学, 2001.
[10] 富向, 王魁军, 杨天鸿. 构造煤的瓦斯放散特征[J]. 煤炭学报, 2008,33(7): 775-779.Fu Xiang, Wang Kuijun, Yang Tianhong. Gas irradiation feature of tectonic coal[J]. Journal of China Coal Society, 2008,33(7): 775-779.
[11] 刘彦伟. 煤粒瓦斯放散规律、机理与动力学模型研究[D].焦作:河南理工大学, 2011.
[12] 秦跃平, 郝永江, 刘鹏, 等. 煤粒瓦斯放散模型对比分析[J]. 煤矿安全, 2015, 46(4): 144-147.Qin Yueping, Hao Yongjiang, Liu Peng, et al. Comparison analysis on emission model of coal particle[J]. Safety in Coal Mines, 2015, 46(4): 144-147.
[13] 王刚, 程卫民, 郭恒,等. 瓦斯压力变化过程中煤体渗透率特性的研究[J]. 采矿与安全工程学报, 2012, 29(5): 735-739.Wang Gang, Cheng Weimin, Guo Heng, et al. Study on permeability charatieristics of coal body with gas pressure variation[J]. Journal of Mining & Safety Engineering, 2012, 29(5): 735-739.
[14] Tanikawa W, Shimamoto T. Comparison of Klinkenbergcorrected gas permeability and water permeability in sedimentary rocks[J]. International Journal of Rock Mechanics and Mining Science, 2009, 46(2): 229-238.
[15] Wu Y S, Pruess K, Persoff P. Gas flow in porous media with Klinkenberg effects[J]. Transport in Porous Media, 1998, 32(1): 117-137.
[16] 李云波, 张玉贵, 张子敏, 等. 构造煤瓦斯解吸初期特征实验研究[J]. 煤炭学报, 2013, 38(1): 15-20.Li Yunbo, Zhang Yugui, Zhang Zimin, et al. Experimental study on gas desorption of tectonic coal at initial stage[J]. Journal of China Coal Society, 2013, 38(1): 15-20.
[17] 张力, 郭勇义, 吴世跃. 块煤瓦斯放散特性的实验研究[J]. 太原理工大学学报, 2001, 32(1): 40-41, 45.Zhang Li, Guo Yongyi, Wu ShiyueExperimental study on features of gas emission of block coal[J]. Journal of Taiyuan University of Technology, 2001,32(1): 40-41, 45.
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