不同加载速率下小纪汗煤矿煤样强度及声发射特征研究
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摘要
利用材料力学试验机及声发射信号检测分析系统,对小纪汗煤矿煤样进行了不同加载速率下单轴压缩过程中的声发射试验,得到了煤样应力应变全过程的声发射特征曲线,分析了不同加载速率下煤样的强度极限、声发射能量及振铃计数等特征参数的变化规律。研究表明:随着加载速率的增加,煤样抗压强度和压缩率呈现先上升后降低的变化趋势,煤样声发射能量释放形式由孤震型向震群型转变,在低加载速率下岩样能量释放形式主要表现为孤震型,在较高加载速率下则主要表现为震群型;不同加载速率下煤样振铃计数变化趋势大致相同,都经历缓慢增加与快速增加阶段,且随着加载速率的提高,声发射累计振铃计数明显减少;单轴压缩时煤样的破坏表现为单剪及双剪破坏,煤样声发射三维定位图与破裂实物图吻合较好。
By material mechanics testing machine and acoustic emission signal detection and analysis system, the uniaxial compression acoustic emission tests under different loading rates of coal samples from Xiaojihan Coal Mine were accomplished and the acoustic emission characteristics curves of coal samples under the complete stress strain process were achieved and the changing laws of characteristic parameters such as ultimate strength, acoustic emission energy, ringing count with the different loading rates have been analyzed. The research shows that: with the increase of loading rate, the compressive strength and compression ratio of the coal samples show the trend of decreasing after the first rise, and the release form of acoustic emission energy for coal samples changes from the lone shock to swarm type, and under the lower loading rate, the energy release form is mainly solitary type and under the higher loading rate, the energy release form is mainly the swarm type; the change tendency of coal samples ringing counts is roughly same under different loading rates, which experienced a slow increase and fast increase stage, and with the increase of loading rate, the cumulative ringing counts of acoustic emission decreased significantly; the damage of coal sample in single axial compression is the single shear and double shear failure, and the three-dimensional positioning map of coal sample acoustic emission is in good agreement with the broken object.
By material mechanics testing machine and acoustic emission signal detection and analysis system, the uniaxial compression acoustic emission tests under different loading rates of coal samples from Xiaojihan Coal Mine were accomplished and the acoustic emission characteristics curves of coal samples under the complete stress strain process were achieved and the changing laws of characteristic parameters such as ultimate strength, acoustic emission energy, ringing count with the different loading rates have been analyzed. The research shows that: with the increase of loading rate, the compressive strength and compression ratio of the coal samples show the trend of decreasing after the first rise, and the release form of acoustic emission energy for coal samples changes from the lone shock to swarm type, and under the lower loading rate, the energy release form is mainly solitary type and under the higher loading rate, the energy release form is mainly the swarm type; the change tendency of coal samples ringing counts is roughly same under different loading rates, which experienced a slow increase and fast increase stage, and with the increase of loading rate, the cumulative ringing counts of acoustic emission decreased significantly; the damage of coal sample in single axial compression is the single shear and double shear failure, and the three-dimensional positioning map of coal sample acoustic emission is in good agreement with the broken object.
引文
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[15]李顺才,李强,缪协兴,等.小纪汗井田地层介质渗透特性及煤层为主含水层成因机制[J].煤炭学报,2017,42(2):353-359.
[2]李海涛,蒋春祥,姜耀东,等.加载速率对煤样力学行为影响的试验研究[J].中国矿业大学学报,2015,44(3):430-436.
[3]李彦伟,姜耀东,杨英明,等.煤单轴抗压强度特性的加载速率效应研究[J].采矿与安全工程学报,2016,33(4):754-760.
[4]杨永杰,王德超,李博,等.煤岩三轴压缩损坏破坏声发射特征[J].应用基础与工程科学学报,2015,23(1):127-135.
[5]张孟举,赵伏军,陈珂,等.不同加载速率下花岗岩破裂声发射试验研究[M].矿业工程研究,2016,31(4):9-13.
[6]吕志强.加载速率对煤岩抗拉强度参数影响程度研究[J].煤炭技术,2014,33(10):301-302.
[7]郭晓敏,马金魁.基于声发射能量值的煤炭试样损伤分析[J].中州煤炭,2016(7):71-74.
[8]李明宝,孙振国,陈冲,等.单轴压缩下土体声发射参数与力学参数关系研究[J].科学技术与工程,2016,16(30):278-283.
[9]陈珂,赵伏军,张柏,等.不同加载速率下砂岩巴西劈裂声发射试验研究[J].矿业工程研究,2015,30(2):37-42.
[10]王伟超,刘希亮,张五交.不同应变率下的盐岩损伤声发射时空演化[J].江苏大学学报,2015,36(4):491-496.
[11]曹安业,井广成,窦林名,等.不同加载速率下岩样损伤演化的声发射特征研究[J].采矿与安全工程学报,2015,32(6):923-935.
[12]张黎明,王在泉,石磊,等.不同应力路径下大理岩破坏过程的声发射特性[J].岩石力学与工程学报,2012,31(6):1230-1236.
[13]苏承东,高保彬,南华,等.不同应力路径下煤样变形破坏过程声发射特征的试验研究[J].岩石力学与工程学报,2009,28(4):757-766.
[14]张楚旋,戴兵,吴秋红.不同应力路径下岩石卸荷破坏过程的变形特性与能量耗散分析[J].中国安全生产科学技术,2014(10):35-40.
[15]李顺才,李强,缪协兴,等.小纪汗井田地层介质渗透特性及煤层为主含水层成因机制[J].煤炭学报,2017,42(2):353-359.