煤层释放瓦斯膨胀能研究
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摘要
针对煤与瓦斯突出危险性预测问题,对煤层释放瓦斯膨胀能进行了深入研究。根据瓦斯膨胀能基本计算方法,以煤层瓦斯流动压力场分布规律为基础,分别建立了煤壁释放瓦斯膨胀能和钻孔释放瓦斯膨胀能理论方程式;并应用MATLAB数值模拟软件,进一步对钻孔释放瓦斯膨胀能进行了分析计算。结果表明:钻孔释放瓦斯膨胀能在释放时间前3 s内下降急聚,且该能量大小受煤层瓦斯压力影响最大,受透气性系数影响次之,受瓦斯含量系数影响最小。钻孔释放瓦斯膨胀能真实反映了实际煤层瞬间释放瓦斯的能力,矿井在煤层瓦斯压力测定时,通过实测钻孔释放瓦斯膨胀能,可以准确预测煤层突出危险性。
Aiming at the problems about prediction techniques for coal and gas outburst hazard,an in-depth study on dilatation energy of released gas from coal seam is conducted.Following the basic calculation methods of dilatation energy,based on the distribution rules of gas released from coal seam,the theoretical equations of dilatation energy of released gas from coal ribs and drilling boreholes have been derived respectively.In addition,by using the numerical simulation software of MATLAB,dilatation energy released from the drilling boreholes was further analyzed and calculated.The results show that there is a sharp decrease for the value of dilatation energy of released gas within the first 3 seconds in releasing time.The biggest factor affecting the energy is coal in-seam gas pressure;the second biggest factor is permeability coefficient;while the least one is the coefficient of gas content.Therefore,the dilatation energy of released gas from drilling boreholes can really reflect the instantaneous gas release ability of a coal seam.The measurement result of dilatation energy can be used as a predictor for the risk of coal outburst hazard when the coal in-seam gas pressure is determined in a field test.
Aiming at the problems about prediction techniques for coal and gas outburst hazard,an in-depth study on dilatation energy of released gas from coal seam is conducted.Following the basic calculation methods of dilatation energy,based on the distribution rules of gas released from coal seam,the theoretical equations of dilatation energy of released gas from coal ribs and drilling boreholes have been derived respectively.In addition,by using the numerical simulation software of MATLAB,dilatation energy released from the drilling boreholes was further analyzed and calculated.The results show that there is a sharp decrease for the value of dilatation energy of released gas within the first 3 seconds in releasing time.The biggest factor affecting the energy is coal in-seam gas pressure;the second biggest factor is permeability coefficient;while the least one is the coefficient of gas content.Therefore,the dilatation energy of released gas from drilling boreholes can really reflect the instantaneous gas release ability of a coal seam.The measurement result of dilatation energy can be used as a predictor for the risk of coal outburst hazard when the coal in-seam gas pressure is determined in a field test.
引文
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[17]俞启香.矿井瓦斯防治[M].徐州:中国矿业大学出版社,1992.
[2]文光才,周俊,刘胜.对突出做功的瓦斯内能的研究[J].矿业安全与环保,2002(1):1-3.WEN Guang-cai,ZHOU Jun,LIU Sheng.Study onintrinsic gas energy to do work in outburst[J].MiningSafety&Environmental Protection,2002(1):1-3.
[3]霍多特B B.煤与瓦斯突出[M].宋世钊,王佑安,译.北京:中国工业出版社,1966.
[4]魏风清.煤与瓦斯突出的物理爆炸模型及预测指标研究[D].焦作:河南理工大学安全科学与工程学院,2010.
[5]张子敏,张玉贵.瓦斯地质规律与瓦斯预测[M].北京:煤炭工业出版社,2005.
[6]蒋承林.突出危险性的线性判别法及临界值研究[J].中国矿业大学学报,2000,29(1):63-66.JIANG Cheng-lin.Linear discriminatory analysis oncoal-gas outburst danger and its critical value[J].Journalof China University of Mining&Technology,2000,29(1):63-66.
[7]蒋承林,俞启香.煤与瓦斯突出的球壳失稳机理及防治技术[M].徐州:中国矿业大学出版社,1998.
[8]侯世松,蒋承林.初始释放瓦斯膨胀能测定原理与应用[J].采矿与安全工程学报,2008,25(3):322-326.HOU Shi-song,JIANG Cheng-lin.Principicle inmeasuring expanding energy of initially released methaneand appliciation[J].Journal of Mining&Safety Engi-neering,2008,25(3):322-326.
[9]刘彦伟,浮绍礼,浮爱青.基于突出热动力学的瓦斯膨胀能计算方法研究[J].河南理工大学学报,2008,27(1):1-5.LIU Yan-wei.FU Shao-li,FU Ai-qing.Study on thecalculating methods of gas expansion energy base onthermo kinetic of outburst[J].Journal of Henan Poly-technic University,2008,27(1):1-5.
[10]刘明举,颜爱华,丁伟,等.煤与瓦斯突出热动力过程的研究[J].煤炭学报,2003,28(1):50-54.LIU Ming-ju,YAN Ai-hua,DING Wei,et al.Researchof thermodynamic process of coal and gas outburst[J].Journal of China Coal Society,2003,28(1):50-54.
[11]王凯,俞启香.煤与瓦斯突出的非线性特征及预测模型[M].徐州:中国矿业大学出版社,2005.
[12]何学秋.含瓦斯煤岩流变动力学[M].徐州:中国矿业大学出版社,1995.
[13]齐黎明,陈学习,程五一.瓦斯膨胀能与瓦斯压力和含量的关系[J].煤炭学报,2005,35(1):105-108.QI Li-ming,CHEN Xue-xi,CHENG Wu-yi.Relationshipof expansion energy of gas with gas pressure and con-tent[J].Journal of China Coal Society,2005,35(1):105-108.
[14]周世宁,林柏泉.煤层瓦斯赋存与流动理论[M].北京:煤炭工业出版社,1999.
[15]林柏泉,崔恒信.矿井瓦斯防治理论与技术[M].徐州:中国矿业大学出版社,1998.
[16]于不凡.煤矿瓦斯灾害防治及利用技术手册[M].北京:煤炭工业出版社,2005.
[17]俞启香.矿井瓦斯防治[M].徐州:中国矿业大学出版社,1992.