动静组合加载下煤体损伤及力学特性研究
|
摘要
为了揭示动力扰动下煤体的冲击失稳机理,对动静组合加载下煤体损伤机制及力学响应特征进行定性研究。首先进行冲击矿井煤体力学性质测定试验,继而运用RFPA2D-DynamicStatic软件模拟分析了静力水平和动力扰动波形对煤体裂隙发育、损伤单元分布及声发射特征的影响,研究了动力扰动对煤体力学性能和能量演化特征的影响。研究结果表明:(1)动静组合加载下,煤体抗压强度与损伤度呈线性负相关性,弹性能储能极限与损伤度呈负指数关系。(2)在动力扰动作用下,煤体内部损伤不断加剧,煤体弹性能储能极限以[]13.71ln 36.33eU (28)-D (10)的趋势不断降低,冲击破坏损耗能不断减少,原本积聚在煤体内的弹性能会瞬间释放,导致煤体冲击破坏。(3)提出了增加煤柱的抗扰动能力和减少煤体中积聚的弹性能2种防治震动型冲击地压措施。
To figure out the mechanism of coal bumps for highly-stressed coal under dynamic disturbance, the damage and mechanical properties of coal under coupled static-dynamic loading were qualitatively investigated. Firstly the mechanical properties of coal were experimentally measured. Based on the experimental data, numerical simulation model was established using RFPA2 D-Dynamic Static software. The effects of static stress levels and dynamic disturbance waveform on fracture development, damage unit distribution and acoustic emission of coal were analyzed. The mechanical properties and energy evolution of coal under dynamic disturbance were also studied. Results are as follows:(1) There is a linear negative correlation between compressive strength and damage degree of coal under static and dynamic loading. Elastic energy storage limit and damage degree have negative exponential relationship.(2) Under the dynamic disturbance, the damage inside coal body increases, and the trend of energy storage limit of coal body decreases. The original accumulation in the coal body of elastic performance will be instantly released, leading to coal damage.(3) From the point of decrease in elastic energy release, two measures for coal bumps prevention are put forward. On the one hand, disturbance rejection ability of coal should be strengthened. Elastic energy storage limits can be strengthened by roadway support. On the other hand, elasticity in coal should be released through relief boreholes.
To figure out the mechanism of coal bumps for highly-stressed coal under dynamic disturbance, the damage and mechanical properties of coal under coupled static-dynamic loading were qualitatively investigated. Firstly the mechanical properties of coal were experimentally measured. Based on the experimental data, numerical simulation model was established using RFPA2 D-Dynamic Static software. The effects of static stress levels and dynamic disturbance waveform on fracture development, damage unit distribution and acoustic emission of coal were analyzed. The mechanical properties and energy evolution of coal under dynamic disturbance were also studied. Results are as follows:(1) There is a linear negative correlation between compressive strength and damage degree of coal under static and dynamic loading. Elastic energy storage limit and damage degree have negative exponential relationship.(2) Under the dynamic disturbance, the damage inside coal body increases, and the trend of energy storage limit of coal body decreases. The original accumulation in the coal body of elastic performance will be instantly released, leading to coal damage.(3) From the point of decrease in elastic energy release, two measures for coal bumps prevention are put forward. On the one hand, disturbance rejection ability of coal should be strengthened. Elastic energy storage limits can be strengthened by roadway support. On the other hand, elasticity in coal should be released through relief boreholes.
引文
[1]姜耀东,潘一山,姜福兴,等.我国煤炭开采中的冲击地压机理和防治[J].煤炭学报,2014,39(2):205-212.JIANG Yaodong,PAN Yishan,JIANG Fuxing,et al.Stateoftheartreviewonmechanismandpreventionof coal bumps in China[J].Journal of China Coal Society,2014,39(2):205-212.
[2]杨英明.动力扰动下深部高应力煤体冲击失稳机理及防治技术研究[D].北京:中国矿业大学(北京),2016.
[3]张科学.构造与巨厚砾岩耦合条件下回采巷道冲击地压机理研究[D].北京:中国矿业大学(北京),2015.
[4]张科学,何满潮,姜耀东.断层滑移活化诱发巷道冲击地压机理研究[J].煤炭科学技术,2017,45(2):12-19.ZHANGKexue,HEManchao,JIANGYaodong.Mechanismresearchofroadwaypressurebumpinduced byfaultslipandactivation[J].CoalScienceandTechnology,2017,45(2):12-19.
[5]马春德.一维动静组合加载下岩石力学特性的试验研究[D].长沙:中南大学,2004.
[6]左宇军.动静组合加载下岩石破坏特性研究[D].长沙:中南大学,2005.
[7]唐礼忠,武建力,刘涛,等.大理岩在高应力状态下受小幅循环动力扰动的力学试验[J].中南大学学报(自然科学版),2014,45(12):4300-4307.TANG Lizhong,WU Jianli,LIU Tao,et al.Mechanical experimentsofmarbleunderhighstressandcyclicdynamicdisturbanceofsmallamplitude[J]. Journalof CentralSouthUniversity(ScienceandTechnology),2014,45(12):4300-4307.
[8]李夕兵,宫凤强,高科,等.一维动静组合加载下岩石冲击破坏试验研究[J].岩土力学与工程学报,2010,29(2):251-260.LI Xibing,GONG Fengqiang,GAO Ke,et al.Test study ofimpactfailureofrocksubjectedtoone-dimensional coupled static and dynamic loads[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(2):251-260.
[9]宫凤强.动静组合加载下岩石力学特性和动态强度准则的试验研究[D].长沙:中南大学,2010.
[10]宫凤强,李夕兵,刘希灵.三维动静组合加载下岩石力学特性试验初探[J].岩土力学与工程学报,2011,30(6):1179-1190.GONG Fengqiang,LI Xibing,LIU Xiling.Preliminary experimental study of characteristics of rock subjected to3D coupled static and dynamic loads[J].Chinese Journal ofRockMechanicsandEngineering,2011,30(6):1179-1190.
[11]王其胜,万国香,李夕兵.动静组合加载下岩石破坏的声发射实验[J].爆炸与冲击,2010,30(3):247-253.WANG Qisheng,WAN Guoxiang,LI Xibing.Acoustic emissionexperimentofrockfailureundercoupledstatic-dynamic loads[J].Explosion and Shock Waves,2010,30(3):247-253.
[12]周子龙.岩石动静组合加载实验与力学特性研究[D].长沙:中南大学,2007.
[13]宫凤强,李夕兵,刘希灵.一维动静组合加载下砂岩动力学特性的试验研究[J].岩石力学与工程学报,2010,29(10):2076-2085.GONGFengqiang,LIXibing,LIUXiling.Studyon failureandfragmentationcharacteristicsofrockunder static-dynamiccoupledloading[J].ChineseJournalof RockMechanicsandEngineering, 2010, 29(10):2076-2085.
[14]万国香,王其胜,李夕兵.动静组合加载下花岗岩的力学性能[J].应用力学学报,2010,27(3):630-634.WAN Guoxiang,WANG Qisheng,LI Xibing.Mechanicalpropertiesofgraniteunderstatic-dynamiccoupled loading[J].Chinese Journal of Applied Mechanics,2010,27(3):630-634.
[15]刘运通,高文学.高应变率下岩石力学响应特性研究[C]//汪旭光.第七届全国工程爆破学术会议论文集.乌鲁木齐:新疆青少年出版社,2001:77-82.
[16]赵伏军,谢世勇,潘建忠,等.动静组合载荷作用下岩石破碎数值模拟及试验研究[J].岩土工程学报,2011,33(8):1290-1295.ZHAOFujun,XIEShiyong,PANJianzhong,etal.Numericalsimulationandexperimentalinvestigationon rockfragmentationundercombineddynamicandstatic loading[J].Chinese Journal of Geotechnical Engineering,2011,33(8):1290-1295.
[17]黎昕.一维动静组合载荷下灰岩力学特性研究[D].昆明:昆明理工大学,2014.
[18]杜坤.真三轴卸载下深部岩体破裂特性及诱发型岩爆机理研究[D].长沙:中南大学,2013.
[19]李多勇.节理岩体岩爆机制的数值模拟研究[J].矿业工程,2016,14(5):60-62.LI Duoyong.Numerical simulation study on rock bursting mechanism of jointed rock[J].Mining Engineering,2016,14(5):60-62.
[20]胡少斌,王恩元,沈荣喜.深部煤岩动力扰动响应特征及数值分析[J].中国矿业大学学报,2013,42(4):541-546.HUShaobin, WANGEnyuan, SHENRongxi.Characteristicsofdynamicdisturbanceresponseindeep coalandrockanditsnumericalanalysis[J].Journalof China University of Mining&Technology,2013,42(4):541-546.
[21]李成武,王金贵,解北京,等.煤岩材料SHPB实验被动围压数值模拟研究[J].采矿与安全工程学报,2014,31(6):957-962.LIChengwu, WANGJingui, XIEBeijing, et al.NumericalanalysisofSplitHopkinsonPressureBar test with passive confined pressure for coal[J].Journal of Mining&Safety Engineering,2014,31(6):957-962.
[2]杨英明.动力扰动下深部高应力煤体冲击失稳机理及防治技术研究[D].北京:中国矿业大学(北京),2016.
[3]张科学.构造与巨厚砾岩耦合条件下回采巷道冲击地压机理研究[D].北京:中国矿业大学(北京),2015.
[4]张科学,何满潮,姜耀东.断层滑移活化诱发巷道冲击地压机理研究[J].煤炭科学技术,2017,45(2):12-19.ZHANGKexue,HEManchao,JIANGYaodong.Mechanismresearchofroadwaypressurebumpinduced byfaultslipandactivation[J].CoalScienceandTechnology,2017,45(2):12-19.
[5]马春德.一维动静组合加载下岩石力学特性的试验研究[D].长沙:中南大学,2004.
[6]左宇军.动静组合加载下岩石破坏特性研究[D].长沙:中南大学,2005.
[7]唐礼忠,武建力,刘涛,等.大理岩在高应力状态下受小幅循环动力扰动的力学试验[J].中南大学学报(自然科学版),2014,45(12):4300-4307.TANG Lizhong,WU Jianli,LIU Tao,et al.Mechanical experimentsofmarbleunderhighstressandcyclicdynamicdisturbanceofsmallamplitude[J]. Journalof CentralSouthUniversity(ScienceandTechnology),2014,45(12):4300-4307.
[8]李夕兵,宫凤强,高科,等.一维动静组合加载下岩石冲击破坏试验研究[J].岩土力学与工程学报,2010,29(2):251-260.LI Xibing,GONG Fengqiang,GAO Ke,et al.Test study ofimpactfailureofrocksubjectedtoone-dimensional coupled static and dynamic loads[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(2):251-260.
[9]宫凤强.动静组合加载下岩石力学特性和动态强度准则的试验研究[D].长沙:中南大学,2010.
[10]宫凤强,李夕兵,刘希灵.三维动静组合加载下岩石力学特性试验初探[J].岩土力学与工程学报,2011,30(6):1179-1190.GONG Fengqiang,LI Xibing,LIU Xiling.Preliminary experimental study of characteristics of rock subjected to3D coupled static and dynamic loads[J].Chinese Journal ofRockMechanicsandEngineering,2011,30(6):1179-1190.
[11]王其胜,万国香,李夕兵.动静组合加载下岩石破坏的声发射实验[J].爆炸与冲击,2010,30(3):247-253.WANG Qisheng,WAN Guoxiang,LI Xibing.Acoustic emissionexperimentofrockfailureundercoupledstatic-dynamic loads[J].Explosion and Shock Waves,2010,30(3):247-253.
[12]周子龙.岩石动静组合加载实验与力学特性研究[D].长沙:中南大学,2007.
[13]宫凤强,李夕兵,刘希灵.一维动静组合加载下砂岩动力学特性的试验研究[J].岩石力学与工程学报,2010,29(10):2076-2085.GONGFengqiang,LIXibing,LIUXiling.Studyon failureandfragmentationcharacteristicsofrockunder static-dynamiccoupledloading[J].ChineseJournalof RockMechanicsandEngineering, 2010, 29(10):2076-2085.
[14]万国香,王其胜,李夕兵.动静组合加载下花岗岩的力学性能[J].应用力学学报,2010,27(3):630-634.WAN Guoxiang,WANG Qisheng,LI Xibing.Mechanicalpropertiesofgraniteunderstatic-dynamiccoupled loading[J].Chinese Journal of Applied Mechanics,2010,27(3):630-634.
[15]刘运通,高文学.高应变率下岩石力学响应特性研究[C]//汪旭光.第七届全国工程爆破学术会议论文集.乌鲁木齐:新疆青少年出版社,2001:77-82.
[16]赵伏军,谢世勇,潘建忠,等.动静组合载荷作用下岩石破碎数值模拟及试验研究[J].岩土工程学报,2011,33(8):1290-1295.ZHAOFujun,XIEShiyong,PANJianzhong,etal.Numericalsimulationandexperimentalinvestigationon rockfragmentationundercombineddynamicandstatic loading[J].Chinese Journal of Geotechnical Engineering,2011,33(8):1290-1295.
[17]黎昕.一维动静组合载荷下灰岩力学特性研究[D].昆明:昆明理工大学,2014.
[18]杜坤.真三轴卸载下深部岩体破裂特性及诱发型岩爆机理研究[D].长沙:中南大学,2013.
[19]李多勇.节理岩体岩爆机制的数值模拟研究[J].矿业工程,2016,14(5):60-62.LI Duoyong.Numerical simulation study on rock bursting mechanism of jointed rock[J].Mining Engineering,2016,14(5):60-62.
[20]胡少斌,王恩元,沈荣喜.深部煤岩动力扰动响应特征及数值分析[J].中国矿业大学学报,2013,42(4):541-546.HUShaobin, WANGEnyuan, SHENRongxi.Characteristicsofdynamicdisturbanceresponseindeep coalandrockanditsnumericalanalysis[J].Journalof China University of Mining&Technology,2013,42(4):541-546.
[21]李成武,王金贵,解北京,等.煤岩材料SHPB实验被动围压数值模拟研究[J].采矿与安全工程学报,2014,31(6):957-962.LIChengwu, WANGJingui, XIEBeijing, et al.NumericalanalysisofSplitHopkinsonPressureBar test with passive confined pressure for coal[J].Journal of Mining&Safety Engineering,2014,31(6):957-962.