大采高综放开采煤岩损伤统计力学模型
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摘要
根据特厚煤层大采高综放开采煤壁前方支承压力的分布特征,从煤岩内部缺陷的随机性分布特征出发,基于反映煤岩内部缺陷的微元强度服从韦布分布的概念,建立了支承压力作用下煤岩的损伤统计力学模型,确定了特厚煤层大采高综放面在煤壁片帮不影响生产的情况下的合理采高,并分析了特厚煤层大采高综放面合理采高与煤壁片帮程度、煤层内摩擦角、煤层内聚力和顶煤变形的关系。最后,通过工程实例分析,验证了该模型的合理性。
A statistic-mechanical model of coal damage under abutment pressure is presented in this paper based on the concept that micro-unit strength which reflects the internal defect of coal obeys the Weibull distribution.The model is built on the premise of the random distribution of internal defect in coal and the distribution characteristics of abutment pressure in the front of full-mechanized caving mining with large mining height in ultra thick coal seam.According to the model,the reasonable mining height was determined for caving mining with large height in thick seam under normal mining conditions.The relationship of reasonable mining height respectively with rib spalling degree,internal friction angle,cohesion of coal and the deformation of top coal was also analyzed.Finally,the model was proved to be rational by engineering example analysis.
A statistic-mechanical model of coal damage under abutment pressure is presented in this paper based on the concept that micro-unit strength which reflects the internal defect of coal obeys the Weibull distribution.The model is built on the premise of the random distribution of internal defect in coal and the distribution characteristics of abutment pressure in the front of full-mechanized caving mining with large mining height in ultra thick coal seam.According to the model,the reasonable mining height was determined for caving mining with large height in thick seam under normal mining conditions.The relationship of reasonable mining height respectively with rib spalling degree,internal friction angle,cohesion of coal and the deformation of top coal was also analyzed.Finally,the model was proved to be rational by engineering example analysis.
引文
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[2]高召宁,石平五.急倾斜水平分段放顶煤开采岩移规律[J].西安科技学院学报,2001,21(4):316-318.(GAOZhao-ning,SHI Ping-wu.Rock Movement Lawof Horizon-tal Section Top Coal Caving in Steep Seam[J].Xi’an U-niversity of Science&Technology Journal,2001,21(4):316-318.(in Chinese))
[3]高延法.岩石真三轴压力试验与岩体损伤力学[M].北京:地震出版社,1999.(GAO Yan-fa.The Investigationon the Rock Strength Theory and the Deformation Mechan-ics of Mining Floor[M].Beijing:Seismological Press,1999.(in Chinese))
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[6]康亚明,刘长武,贾延,等.岩石的统计损伤本构模型及临界损伤度研究[J].四川大学学报(工程科学版),2009,41(4):42-47.(KANG Ya-ming,LIU Chang-wu,JIA Yan,et al.Research on Statistical Damage Constitu-tive Model and Critical Damage for Rock Subjected to Tri-axial Stress Condition[J].Journal of Sichuan University(Engineering Science Edition),2009,41(4):42-47.(inChinese))
[7]康亚明,刘长武,陈义军,等.水压轴压联合作用下煤岩的统计损伤本构模型研究[J].西安建筑科技大学学报(自然科学版),2009,41(2):180-186.(KANG Ya-ming,LIU Chang-wu,CHEN Yi-jun,et al.Research onStatistical Damage Constitutive Model for Coal-Rock Sub-jected to Hydraulic Pressure and Pulldown[J].Journal ofXi’an University of Architecture&Technology(NaturalScience Edition),2009,41(2):180-186.(in Chinese))
[8]马念杰,侯超炯.采准巷道矿压理论及应用[M].北京:煤炭工业出版社,1995.(MA Nian-jie,HOU Chao-jiong.The Underground Pressure of Sectional Roadways and ItsControl[M].Beijing:Coal Industry Publishing House,1995.(in Chinese))
[2]高召宁,石平五.急倾斜水平分段放顶煤开采岩移规律[J].西安科技学院学报,2001,21(4):316-318.(GAOZhao-ning,SHI Ping-wu.Rock Movement Lawof Horizon-tal Section Top Coal Caving in Steep Seam[J].Xi’an U-niversity of Science&Technology Journal,2001,21(4):316-318.(in Chinese))
[3]高延法.岩石真三轴压力试验与岩体损伤力学[M].北京:地震出版社,1999.(GAO Yan-fa.The Investigationon the Rock Strength Theory and the Deformation Mechan-ics of Mining Floor[M].Beijing:Seismological Press,1999.(in Chinese))
[4]楼之文.损伤力学基础[M].西安:西安交通大学出版社,1991.(LOU Zhi-wen.Fundamentals of Damage Me-chanics[M].Xi’an:Xi’an Jiaotong University Press,1991.(in Chinese))
[5]耶格J C,库克N G W.岩石力学基础[M].北京:科学出版社,1981.(JAEGER J C,COOK N G W.Fundamen-tals of Rock Mechanics[M].Beijing:Science Press,1981.(in Chinese))
[6]康亚明,刘长武,贾延,等.岩石的统计损伤本构模型及临界损伤度研究[J].四川大学学报(工程科学版),2009,41(4):42-47.(KANG Ya-ming,LIU Chang-wu,JIA Yan,et al.Research on Statistical Damage Constitu-tive Model and Critical Damage for Rock Subjected to Tri-axial Stress Condition[J].Journal of Sichuan University(Engineering Science Edition),2009,41(4):42-47.(inChinese))
[7]康亚明,刘长武,陈义军,等.水压轴压联合作用下煤岩的统计损伤本构模型研究[J].西安建筑科技大学学报(自然科学版),2009,41(2):180-186.(KANG Ya-ming,LIU Chang-wu,CHEN Yi-jun,et al.Research onStatistical Damage Constitutive Model for Coal-Rock Sub-jected to Hydraulic Pressure and Pulldown[J].Journal ofXi’an University of Architecture&Technology(NaturalScience Edition),2009,41(2):180-186.(in Chinese))
[8]马念杰,侯超炯.采准巷道矿压理论及应用[M].北京:煤炭工业出版社,1995.(MA Nian-jie,HOU Chao-jiong.The Underground Pressure of Sectional Roadways and ItsControl[M].Beijing:Coal Industry Publishing House,1995.(in Chinese))
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