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| Experimental study on the influence of hydrostatic pressure on the gas desorption of coal |
| LIU Chao1，2，3，HUANG Gun1，2，3，SONG Zhenlong1，2，3，LI Minghui1，2，3，ZHAO Honggang1，2，3，ZHANG Chi1，2，3，BIAN Guang1，2，3 |
| (1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400030，China；2. College of Resources and Environmental Sciences，Chongqing University，Chongqing 400030，China；3. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam，Chongqing University，Chongqing 400030，China) |
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Abstract Gas desorption of coal under different hydrostatic pressures in closed environment was studied based on the servo-controlled seepage equipment for thermal-hydrological- mechanical coupling of coal developed in-house. The variation of the gas desorption pressure in the confined environment was analyzed with the state equation of ideal gas as a bridge. With the increase of hydrostatic pressure，the pressure of gas in the closed system increases by 0.277%–0.750%. There are two parts in the change of gas pressure( )：the change of the gas pressure caused by the spatial change of porosity and fracture caused by the stress loading( ) and the change of the gas pressure caused by the gas desorption( ). With the increase of hydrostatic pressure，the proportion of decreases，and the proportion of gas desorption pressure in coal increases. As a result，the coal and gas outburst and other dynamic disasters are more prone to occur.
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[1] 谢和平，周宏伟，薛东杰. 煤炭深部开采与极限开采深度的研究与思考[J]. 煤炭学报，2012，37(4)：535–542.(XIE Heping，ZHOU Hongwei，XUE Dongjie. Research and consideration on deep coal mining and critical mining depth[J]. Journal of China Coal Society，2012，37(4)：535–542.(in Chinese))
[2] 何满潮，王春光，李德建，等. 单轴应力–温度作用下煤中吸附瓦斯解吸特征[J]. 岩石力学与工程学报，2010，29(5)：865–872.(HE Manchao，WANG Chunguang，LI Dejian，et al. Desorption characteristics of adsorbed gas in coal samples under coupling temperature and uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(5)：865–872.(in Chinese))
[3] 唐巨鹏，潘一山，李成全，等. 有效应力对煤层气解吸渗流影响试验研究[J]. 岩石力学与工程学报，2006，25(8)：1 563–1 568.(TANG Jupeng，PAN Yishan，LI Chengquan，et al. Experimental study on effect of effective stress on desorption and seepage of coalbed methane[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(8)：1 563–1 568.(in Chinese))
[4] 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. (in Chinese))
[5] 秦跃平，郝永江，刘 鹏，等. 封闭空间内煤粒瓦斯解吸实验与数值模拟[J]. 煤炭学报，2015，40(1)：87–92.(QIN Yueping，HAO Yongjiang，LIU Peng，et al. Coal particle gas desorption experiment and numerical simulation in enclosed space[J]. Journal of China Coal Society，2015，40(1)：87–92.(in Chinese))
[6] 聂百胜，卢红奇，李祥春，等. 煤体吸附–解吸瓦斯变形特征实验研究[J]. 煤炭学报，2015，40(4)：754–759.(NIE Baisheng，LU Hongqi，LI Xiangchun，et al. Experimental study on the characteristic of coal deformation during gas adsorption and desorption process[J]. Journal of China Coal Society，2015，40(4)：754–759.(in Chinese))
[7] 尹光志，李文璞，李铭辉，等. 加卸载条件下原煤渗透率与有效应力的规律[J]. 煤炭学报，2014，39(8)：1 497–1 503.(YIN Guangzhi，LI Wenpu，LI Minghui，et al. Permeability properties and effective stress of raw coal under loading-unloading conditions[J]. Journal of China Coal Society，2014，39(8)：1 497–1 503.(in Chinese))
[8] 尹光志，李铭辉，李文璞，等. 瓦斯压力对卸荷原煤力学及渗透特性的影响[J]. 煤炭学报，2012，37(9)：1 499–1 504.(YIN Guangzhi，LI Minghui，LI Wenpu，et al. Influence of gas pressure on mechanical and seepage characteristics of coal under unloading condition[J]. Journal of China Coal Society，2012，37(9)：1 499–1 504.(in Chinese))
[9] 尹光志，李文璞，李铭辉，等. 不同加卸载条件下含瓦斯煤力学特性试验研究[J]. 岩石力学与工程学报，2013，32(5)：891–901.(YIN Guangzhi，LI Wenpu，LI Minghui，et al. Experimental study of mechanical properties of coal containing methane under different loading-unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(5)：891–901.(in Chinese))
[10] 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 stress-strain process[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(1)：170–175.(in Chinese))
[11] 尹光志，蒋长宝，王维忠，等. 不同卸围压速度对含瓦斯煤岩力学和瓦斯渗流特性影响试验研究[J]. 岩石力学与工程学报，2011，30(1)：68–77.(YIN Guangzhi，JIANG Changbao，WANG Weizhong，et al. Experimental study of influence of confining pressure unloading speed on mechanical properties and gas permeability of containing-gas coal rock[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(1)：68–77.(in Chinese))
[12] 陶云奇，许 江，彭守建，等. 含瓦斯煤孔隙率和有效应力影响因素试验研究[J]. 岩土力学，2010，31(11)：3 417–3 422.(TAO Yunqi，XU Jiang，PENG Shoujian，et al. Experimental study of influencing factor of porosity and effective stress of gas-filled coal[J]. Rock and Soil Mechanics，2010，31(11)：3 417–3 422.(in Chinese))
[13] 马东民，韦 波，蔡忠勇. 煤层气解吸特征的实验研究[J]. 地质学报，2008，82(10)：1 432–1 436.(MA Dongmin，WEI Bo，CAI Zhongyong. Experimental study of coalbed methane desorption[J]. Acta Geologica Sinica，2008，82(10)：1 432–1 436.(in Chinese))
[14] 宋真龙，韩佩博，李文璞，等. 瓦斯对冲击性煤样能量耗散的影响[J]. 煤炭学报，2015，40(4)：843–849.(SONG Zhenlong，HAN Peibo，LI Wenpu，et al. Impact of energy dissipation of coal samples with rockburst tendency from gas in its failure process[J]. Journal of China Coal Society，2015，40(4)：843–849.(in Chinese))
[15] GAL N L，LAGNEAU V，CHARMOILLE A. Experimental characterization of CH4 release from coal at high hydrostatic pressure[J]. International Journal of Coal Geology，2012，96/97：82–92.
[16] CUI X，BUSTIN R M. Volumetric strain associated with methane desorption and its impact on coalbed gas production from deep coal seams[J]. Aapg Bulletin，2005，89(9)：1 181–1 202.
[17] LIU J S，CHEN Z W，DEREK E，et al. Evaluation of stress-controlled coal swelling processes[J]. International Journal of Coal Geology，2010，83(4)：446–455.
[18] GEORGE J D S，BARAKAT M A. The change in effective stress associated with shrinkage from gas desorption in coal[J]. International Journal of Coal Geology，2001，45(2)：105–113.
[19] 刘延保，曹树刚，李 勇，等. 煤体吸附瓦斯膨胀变形效应的试验研究[J]. 岩石力学与工程学报，2010，29(12)：2 484–2 491.(LIU Yanbao，CAO Shugang，LI Yong，et al. Experimental Study of swelling deformation effect of coal induced by gas adsorption[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(12)：2 484–2 491.(in Chinese))
[20] 李小春，付 旭，方志明，等. 有效应力对煤吸附特性影响的试验研究[J]. 岩土力学，2013，34(5)：1 247–1 252.(LI Xiaochun，FU Xu，FANG Zhiming，et al. Experimental study of influence of effective stress on coal adsorption performance[J]. Rock and Soil Mechanics，2013，34(5)：1 247–1 252.(in Chinese))
[21] 谢和平，高 峰，鞠 杨. 深部岩体力学研究与探索[J]. 岩石力学与工程学报，2015，34(11)：2 161–2 178.(XIE Heping，GAO Feng，JU Yang. Research and development of rock mechanics in deep ground engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(11)：2 161–2 178.(in Chinese))
[22] 韩 军，张宏伟，宋卫华，等. 煤与瓦斯突出矿区地应力场研究[J].岩石力学与工程学报，2008，27(增2)：3 852–3 859.(HAN Jun，ZHANG Hongwei，SONG Weihua，et al. In-situ stress field of coal and gas outburst mining area[J].Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.2)：3 852–3 859.(in Chinese))
[23] 赵德安，陈志敏，蔡小林，等. 中国地应力场分布规律统计分析[J].岩石力学与工程学报，2007，26(6)：1 265–1 271.(ZHAO Dean，CHEN Zhimin，CAI Xiaolin，et al. Analysis of distribution rule of geostress in China[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(6)：1 265–1 271.(in Chinese))
[24] 潘荣锟，程远平，董 骏，等. 不同加卸载下层理裂隙煤体的渗透特性研究[J]. 煤炭学报，2014，39(3)：473–477.(PAN Rongkun，CHENG Yuanping，DONG Jun，et al. Research on permeability characteristics of layered natural coal under different loading and unloading[J]. Journal of China Coal Society，2014，39(3)：473–477.(in Chinese))
[25] 刘保县，鲜学福，徐龙君，等. 地球物理场对煤吸附瓦斯特性的影响[J]. 重庆大学学报：自然科学版，2000，23(5)：78–81.(LIU Baoxian，XIAN Xuefu，XU Longjun，et al. Study on adsorption characteristics of coal to gas in geophysical field[J]. Journal of Chongqing University：Natural Science，2000，23(5)：78–81.(in Chinese)) |
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2016, Vol. 35 
