采动工作面前方煤岩体积变形及瓦斯增透研究
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摘要
研究工作面前方煤岩体瓦斯渗透率分布对合理抽取瓦斯具有技术指导意义。通过简化孔隙、裂隙等效力学模型,建立标准圆柱煤岩体试件的等效力学模型,推导含单一裂隙的纯煤岩试样等效轴向、径向与体积应变,并推广应用到含多种裂隙的多种介质组合结构,通过试验验证理论力学模型具有较好的可靠性。以淮南张集矿11-2煤层工作面回采为原型,通过数值计算得到3种典型开采的支承压力峰值集中系数,并推导出支承压力与水平应力分布表达式,其能综合考虑开采条件、影响范围与采动卸压产生的体积膨胀变形。建立体积应变与渗透率之间的多项式关系式,并给出采动条件下不同开采方式下的体积应变分布曲线与渗透率分布曲线,根据其各阶段的特征差异划分为不同的阶段,为工作面抽采瓦斯提供了理论依据。
Study on permeability distribution of coalface is of guiding significance in reasonable exploitation of gas.An equivalent mechanical model is established by simplifying the characteristics of pores and cracks.From the establishment of the equivalent mechanical model for a standard cylindrical coal-rock specimen,the equivalent formulas for axial,radial and volumetric strains are derived for coal-rock samples containing a single crack,and then are extended to the application in a variety of media combinations containing multiple cracks.The theoretical mechanical model shows good reliability by experimental verification.Based on the prototype of 11-2 coal seam mining face of Zhangji Mine in Huainan,the peak concentration factors of abutment pressure under three typical mining layouts are obtained by numerical calculation.An expression for the distribution of abutment pressure and horizontal stress is derived considering different mining layouts,different stages and volume expansion induced by mining.By establishing a polynomial relationship between volumetric strain and permeability,the distribution of volumetric strain and permeability under different mining layouts is obtained,and divided into different stages according to their various characteristics.It may provide a theoretical basis for the coal mine methane.
Study on permeability distribution of coalface is of guiding significance in reasonable exploitation of gas.An equivalent mechanical model is established by simplifying the characteristics of pores and cracks.From the establishment of the equivalent mechanical model for a standard cylindrical coal-rock specimen,the equivalent formulas for axial,radial and volumetric strains are derived for coal-rock samples containing a single crack,and then are extended to the application in a variety of media combinations containing multiple cracks.The theoretical mechanical model shows good reliability by experimental verification.Based on the prototype of 11-2 coal seam mining face of Zhangji Mine in Huainan,the peak concentration factors of abutment pressure under three typical mining layouts are obtained by numerical calculation.An expression for the distribution of abutment pressure and horizontal stress is derived considering different mining layouts,different stages and volume expansion induced by mining.By establishing a polynomial relationship between volumetric strain and permeability,the distribution of volumetric strain and permeability under different mining layouts is obtained,and divided into different stages according to their various characteristics.It may provide a theoretical basis for the coal mine methane.
引文
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[6]浦海,缪协兴.综放采场覆岩冒落与围岩支承压力动态分布规律的数值模拟[J].岩石力学与工程学报,2004,23(7):1122–1126.(PU Hai,MIAO Xie-xing.Numericalsimulation of dynamic falling of overlying rocks andabutment pressure in surrounding rocks for fully-mechanizedtop-coal caving stope[J].Chinese Journal of Rock Mechanicsand Engineering,2004,23(7):1122–1126.(in Chinese))
[7]李树刚,林海飞,成连华.综放开采支承压力与卸压瓦斯运移关系研究[J].岩石力学与工程学报,2004,23(19):3288–3291.(LI Shu-gang,LIN Hai-fei,CHENG Lian-hua.Relation between abutment pressure and relieved gas deliveryfor fully-mechanized top coal caving[J].Chinese Journal ofRock Mechanics and Engineering,2004,23(19):3288–3291.(in Chinese))
[8]谢广祥,杨科,刘全明.综放面倾向煤柱支承压力分布规律研究[J].岩石力学与工程学报,2006,25(3):545–549.(XIE Guang-xiang,YANG Ke,LIU Quan-ming.Study ondistribution laws of stress in inclined coal pillar forfully-mechanized top-coal caving face[J].Chinese Journal ofRock Mechanics and Engineering,2006,25(3):545–549.(inChinese))
[9]史红,姜福兴.基于微地震监测的覆岩多层空间结构倾向支承压力研究[J].岩石力学与工程学报,2008,27(增刊1):3274–3280.(SNI Hong,JIANG Fu-xing.Study onabutment pressure rule of overlying strata spatial structuresbased on micro-seismic monitoring[J].Chinese Journal ofRock Mechanics and Engineering,2008,27(S1):3274–3280.(in Chinese))
[10]刘金海,姜福兴,王乃国,等深井特厚煤层综放工作面支承压力分布特征的实测研究[J].煤炭学报,2011,36(增刊1):18–22.(LIU Jin-hai,JIANG Fu-xing,WANG Nai-guo,et al.Survey on abutment pressure distribution of fully-mechanized caving face in extra-thick coal seam of deepshaft[J].Journal of China Coal Society,2011,36(S1):18–22.(in Chinese))
[11]王龙甫.弹性理论[M].北京:科学出版社,1979.(WANGLong-fu.Theory of elasticity[M].Beijing:Science Press,2002.(in Chinese))
[12]李同林,乌效鸣,屠厚泽.煤岩力学性质测试分析与应用[J].地质与勘探,2000,36(2):85–88.(LI Tong-lin,WUXiao-ming,TU Hou-ze.The measurement and analysis andapplication on the mechanical property of coal seam[J].Geology and Prospecting,2000,36(2):85–88.(in Chinese))
[13]谢和平,周宏伟,刘建峰,等.不同开采条件下采动力学行为研究[J].煤炭学报,2011,36(7):1067–1074.(XIEHe-ping,ZHOU Hong-wei,LIU Jian-feng,et al.Mining-induced mechanical behavior in coal seams under differentmining layouts[J].Journal of China Coal Society,2011,36(7):1067–1074.(in Chinese))
[2]李晓泉,尹光志.含瓦斯煤的有效体积应力与渗透率关系[J].重庆大学学报,2011,34(8):103–109.(LI Xiao-quan,YIN Guang-zhi.Relationship between effective volumetricstress and permeability of gas-filled coal[J].Journal ofChongqing University,2011,34(8):103–109.(in Chinese))
[3]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 Guang-zhi,JIANGChang-bao,WANG Wei-zhong,et al.Experimental study ofinfluence of confining pressure unloading speed onmechanical properties and gas permeability of containing-gascoal rock[J].Chinese Journal of Rock Mechanics andEngineering,2011,30(1):68–77.(in Chinese))
[4]陈忠辉,谢和平.综放采场支承压力分布的损伤力学分析[J].岩石力学与工程学报,2000,19(4):436–439.(CHENZhong-hui,XIE He-ping.Damage mechanics analysis on thedistribution of abutment pressure around a coal face[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(4):436–439.(in Chinese))
[5]王同旭,刘传孝,王小平.孤岛煤柱侧向支承压力分布的数值模拟与雷达探测研究[J].岩石力学与工程学报,2002,21(增刊2):2484–2487.(WANG Tong-xu,LIU Chuan-xiao,WANG Xiao-ping.FLAC3D numerical simulation and radardetection of lateral abutment pressure distribution of isolatedcoal pillar[J].Chinese Journal of Rock Mechanics andEngineering,2002,21(S2):2484–2487.(in Chinese))
[6]浦海,缪协兴.综放采场覆岩冒落与围岩支承压力动态分布规律的数值模拟[J].岩石力学与工程学报,2004,23(7):1122–1126.(PU Hai,MIAO Xie-xing.Numericalsimulation of dynamic falling of overlying rocks andabutment pressure in surrounding rocks for fully-mechanizedtop-coal caving stope[J].Chinese Journal of Rock Mechanicsand Engineering,2004,23(7):1122–1126.(in Chinese))
[7]李树刚,林海飞,成连华.综放开采支承压力与卸压瓦斯运移关系研究[J].岩石力学与工程学报,2004,23(19):3288–3291.(LI Shu-gang,LIN Hai-fei,CHENG Lian-hua.Relation between abutment pressure and relieved gas deliveryfor fully-mechanized top coal caving[J].Chinese Journal ofRock Mechanics and Engineering,2004,23(19):3288–3291.(in Chinese))
[8]谢广祥,杨科,刘全明.综放面倾向煤柱支承压力分布规律研究[J].岩石力学与工程学报,2006,25(3):545–549.(XIE Guang-xiang,YANG Ke,LIU Quan-ming.Study ondistribution laws of stress in inclined coal pillar forfully-mechanized top-coal caving face[J].Chinese Journal ofRock Mechanics and Engineering,2006,25(3):545–549.(inChinese))
[9]史红,姜福兴.基于微地震监测的覆岩多层空间结构倾向支承压力研究[J].岩石力学与工程学报,2008,27(增刊1):3274–3280.(SNI Hong,JIANG Fu-xing.Study onabutment pressure rule of overlying strata spatial structuresbased on micro-seismic monitoring[J].Chinese Journal ofRock Mechanics and Engineering,2008,27(S1):3274–3280.(in Chinese))
[10]刘金海,姜福兴,王乃国,等深井特厚煤层综放工作面支承压力分布特征的实测研究[J].煤炭学报,2011,36(增刊1):18–22.(LIU Jin-hai,JIANG Fu-xing,WANG Nai-guo,et al.Survey on abutment pressure distribution of fully-mechanized caving face in extra-thick coal seam of deepshaft[J].Journal of China Coal Society,2011,36(S1):18–22.(in Chinese))
[11]王龙甫.弹性理论[M].北京:科学出版社,1979.(WANGLong-fu.Theory of elasticity[M].Beijing:Science Press,2002.(in Chinese))
[12]李同林,乌效鸣,屠厚泽.煤岩力学性质测试分析与应用[J].地质与勘探,2000,36(2):85–88.(LI Tong-lin,WUXiao-ming,TU Hou-ze.The measurement and analysis andapplication on the mechanical property of coal seam[J].Geology and Prospecting,2000,36(2):85–88.(in Chinese))
[13]谢和平,周宏伟,刘建峰,等.不同开采条件下采动力学行为研究[J].煤炭学报,2011,36(7):1067–1074.(XIEHe-ping,ZHOU Hong-wei,LIU Jian-feng,et al.Mining-induced mechanical behavior in coal seams under differentmining layouts[J].Journal of China Coal Society,2011,36(7):1067–1074.(in Chinese))
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