不同侧压系数对动载诱发巷道底板冲击的影响
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摘要
为了探讨侧压系数对动载诱发特厚煤层巷道底板冲击的影响,使用岩体力学和FLAC2D有限差分数值模拟软件研究了不同侧压系数作用下应力波诱发特厚煤层巷道底板冲击的动态响应规律及显现过程。研究表明,动力扰动的作用是使处于极限应力下的煤体应力增加并打破平衡状态从而诱发底板冲击;动载作用下,随着侧压系数的增加巷道底板的临界水平应力值和最大应力差呈线性增加,底板最大垂直位移在2.0期间呈非线性增加,在2.0后出现微降,说明底板失稳难易程度与底板冲击显现强度不完全呈正相关;底板冲击的显现过程是底板的水平应力瞬间达到临界水平应力,底板塑性破坏区域扩大,致使弹性能瞬间释放,最终导致底板垂直位移发生突然增大产生冲击。研究成果为探索底板冲击机理及防治提供借鉴。
In order to reveal the influence of lateral pressure coefficients on floor burst induced by dynamic disturbance,dynamic response rules and burst process of floor in extra-thick coal seam induced by dynamic disturbance at different lateral pressure coefficients were studied by using the rock mechanics and FLAC2D finite difference numerical software.The results show that the ultimate stress equilibrium in floor can be disturbed by dynamic loads so that floor burst is induced.With the increase of the lateral pressure coefficients,critical horizontal stress and maximum stress difference of floor will increase linearly,maximum vertical displacement of floor will increase nonlinearly if 2.0and then decrease slightly as 2.0under dynamic loads.These indicate that instability difficult degree is not positively correlated with burst strength for floor completely.The floor burst process is: 1) horizontal stresses reaches critical value instantly,2) plastic area extends,3) elastic energy releases rapidly,4) vertical displacement of floor increase suddenly,5) the floor burst occurs.The conclusions will provide reference for the study on mechanism of floor burst and its prevention in the same conditions.
In order to reveal the influence of lateral pressure coefficients on floor burst induced by dynamic disturbance,dynamic response rules and burst process of floor in extra-thick coal seam induced by dynamic disturbance at different lateral pressure coefficients were studied by using the rock mechanics and FLAC2D finite difference numerical software.The results show that the ultimate stress equilibrium in floor can be disturbed by dynamic loads so that floor burst is induced.With the increase of the lateral pressure coefficients,critical horizontal stress and maximum stress difference of floor will increase linearly,maximum vertical displacement of floor will increase nonlinearly if 2.0and then decrease slightly as 2.0under dynamic loads.These indicate that instability difficult degree is not positively correlated with burst strength for floor completely.The floor burst process is: 1) horizontal stresses reaches critical value instantly,2) plastic area extends,3) elastic energy releases rapidly,4) vertical displacement of floor increase suddenly,5) the floor burst occurs.The conclusions will provide reference for the study on mechanism of floor burst and its prevention in the same conditions.
引文
[1]窦林名,何学秋.冲击矿压防治理论与技术[M].徐州:中国矿业大学出版社,2001.
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[11]陈国祥,窦林名,乔中栋,等.褶皱区应力场分布规律及其对冲击矿压的影响[J].中国矿业大学学报,2008,37(6):751-755.CHEN Guo-xiang,DOU Lin-ming,QIAO Zhong-dong,et al.The stress field distribution in folding-structureareas and its impaction on rock burst[J].Journal of ChinaUniversity of Mining&Technology,2008,37(6):751-755.
[12]陈学华.构造应力型冲击地压发生条件研究[D].阜新:辽宁工程技术大学资源与环境工程学院,2004.
[13]陈国祥.最大水平应力对冲击矿压的作用机制及其应用研究[D].徐州:中国矿业大学矿业工程学院,2009
[14]勾攀峰,韦四江,张盛.不同水平应力对巷道稳定性的模拟研究[J].采矿与安全工程学报,2010,27(2):143-148.GOU Pan-feng,WEI Si-jiang,ZHANG Sheng.Numericalsimulat ion of effect of horizontal stresses at differentlevels on stability of roadways[J].Journal of Mining&Safety Engineering,2010,27(2):143-148.
[15]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2002.
[16]卢爱红,郁时炼,秦昊,等.应力波作用下巷道围岩层裂结构的稳定性研究[J].中国矿业大学学报,2008,37(6):768-774.LU Ai-hong,YU Shi-lian,QIN Hao,et al.Stability oflayered crack structure in roadway surrounding rock un-der stresswave[J].Journal of China University of Mining&Technology,2008,37(6):768-774.
[17]徐学锋.煤层巷道底板冲击机理及其控制研究[D].徐州:中国矿业大学矿业工程学院,2011.
[18]陆菜平.组合煤岩的强度弱化减冲原理及其应用[D].徐州:中国矿业大学矿业工程学院,2008.
[19]周光文,刘文岗,姜耀东,等.采场冲击地压的能量积聚释放特征分析[J].采矿与安全工程学报,2008,25(1):73-77.ZHOU Guang-wen,LIU Wen-gang,JIANG Yao-dong,et al.Characteristics of energy accumulation and re-leaseof rock outburst in mining face[J].Journal of Mining&Safety Engineering,2008,25(1):73-77.
[20]秦昊.巷道围岩失稳机制及冲击矿压机理研究[D].徐州:中国矿业大学理学院,2008.
[2]SLAWOMIR JERZY GIBOWICZ,ANDRZEJ KIJKO.矿山地震学引论[M].修济刚,译.北京:地震出版社,1996.
[3]ORTLEPP W D.Rock fracture and rockbursts[M].Johannesburg:SAIMM,1997.
[4]齐庆新,窦林名.冲击地压理论与技术[M].徐州:中国矿业大学出版社,2008.
[5]KARCINOVIC D.Statistical aspects of the continuousdamage theory[J].International Journal of Solids Struc-tures,1982,18(7):551-562.
[6]牟宗龙,窦林名,张广文,等.坚硬顶板型冲击矿压灾害防治研究[J].中国矿业大学学报,2006,35(6):737-741.MOU Zong-long,DOU Lin-ming,ZHANG Guang-wen,et al.Study on prevention methods of rockburst disastercaused by hard rock roof[J].Journal of China Universityof Mining&Technology,2006,35(6):737-741.
[7]曹安业,范军,牟宗龙,等.矿震动载对围岩的冲击破坏效应[J].煤炭学报,2010,35(12):2006-2010.CAO An-ye,FAN Jun,MOU Zong-long,et al.Burstfailure effect of mining-induced tremor on roadway sur-rounding rock[J].Journal of China Coal Society,2010,35(12):2006-2010.
[8]GAO Ming-shi,DOU Lin-ming,ZHANG Nong,et al.Simulation of relationship of roadway dynamic destruc-tion to hypocenter parameters[J].Journal of China Uni-versity of Mining&Technology,2007,18(1):93-97.
[9]高明仕,窦林名,张农,等.冲击矿压巷道围岩控制的强弱强力学模型及其应用分析[J].岩土力学,2008,29(2):426-430.GAO Ming-shi,DOU Ling-ming,ZHANG Nong,et al.Strong-soft-strong mechanical model for controllingroadway surrounding rock subjected to rock burst and itsapplication[J].Rock and Soil Mechanics,2008,29(2):426-430.
[10]李长洪,张吉良,蔡美峰,等.大同矿区地应力测量及其与地质构造的关系[J].北京科技大学学报,2008,30(2):115-119.LI Chang-hong,ZHANG Ji-liang,CAI Mei-feng,et al.Measurement of in-situ stress and relationship betweenthe stress and geologic structure in Datong mining area,China[J].Journal of University of Science and Tech-nology Beijing,2008,30(2):115-119.
[11]陈国祥,窦林名,乔中栋,等.褶皱区应力场分布规律及其对冲击矿压的影响[J].中国矿业大学学报,2008,37(6):751-755.CHEN Guo-xiang,DOU Lin-ming,QIAO Zhong-dong,et al.The stress field distribution in folding-structureareas and its impaction on rock burst[J].Journal of ChinaUniversity of Mining&Technology,2008,37(6):751-755.
[12]陈学华.构造应力型冲击地压发生条件研究[D].阜新:辽宁工程技术大学资源与环境工程学院,2004.
[13]陈国祥.最大水平应力对冲击矿压的作用机制及其应用研究[D].徐州:中国矿业大学矿业工程学院,2009
[14]勾攀峰,韦四江,张盛.不同水平应力对巷道稳定性的模拟研究[J].采矿与安全工程学报,2010,27(2):143-148.GOU Pan-feng,WEI Si-jiang,ZHANG Sheng.Numericalsimulat ion of effect of horizontal stresses at differentlevels on stability of roadways[J].Journal of Mining&Safety Engineering,2010,27(2):143-148.
[15]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2002.
[16]卢爱红,郁时炼,秦昊,等.应力波作用下巷道围岩层裂结构的稳定性研究[J].中国矿业大学学报,2008,37(6):768-774.LU Ai-hong,YU Shi-lian,QIN Hao,et al.Stability oflayered crack structure in roadway surrounding rock un-der stresswave[J].Journal of China University of Mining&Technology,2008,37(6):768-774.
[17]徐学锋.煤层巷道底板冲击机理及其控制研究[D].徐州:中国矿业大学矿业工程学院,2011.
[18]陆菜平.组合煤岩的强度弱化减冲原理及其应用[D].徐州:中国矿业大学矿业工程学院,2008.
[19]周光文,刘文岗,姜耀东,等.采场冲击地压的能量积聚释放特征分析[J].采矿与安全工程学报,2008,25(1):73-77.ZHOU Guang-wen,LIU Wen-gang,JIANG Yao-dong,et al.Characteristics of energy accumulation and re-leaseof rock outburst in mining face[J].Journal of Mining&Safety Engineering,2008,25(1):73-77.
[20]秦昊.巷道围岩失稳机制及冲击矿压机理研究[D].徐州:中国矿业大学理学院,2008.
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