高温作用后石灰岩受压破裂过程的声发射试验研究
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摘要
利用声发射测试和单轴压缩试验相结合的方法,研究了河南焦作矿区的石灰岩在100~800°C高温压缩破坏条件下的声发射过程,结合不同温度下石灰岩的力学性质,分析不同声发射参数条件下石灰岩在不同受力阶段的声发射特点.结果表明:在高温作用下石灰岩出现了明显的声发射现象;石灰岩峰值应力随着作用温度的升高而不断降低,800°C以后,峰值应力较600°C时降幅达50%,但是峰值应变随着作用温度的升高而变化不明显;在400°C以前,声发射振铃累计数均值随着温度的升高而增加,400°C后随着温度的升高而不断降低;在600~800°C时,试样呈现出明显的塑性破坏特征,高温致使石灰岩劣化,声发射试验中,振铃累计数大幅度降低,应力与应变和声发射特征参数变化规律较吻合.
The mechanical properties and acoustic emission evolution process of limestone under the action of high temperature load were investigated by combining the methods of acoustic emission technique and uniaxial compression test.The temperature varies in the range of 100,200,400,600 and 800 °C.Acoustic emission characteristic parameters and the mechanical parameter under different temperatures were analyzed.The results show that the temperature affects the acoustic emission phenomenon of limestone obviously,the peak stress decreases as the temperature increases and drops by 50 percent from 600 °C to 800 °C,but the peak strain changes not obviously;the average accumulative ring-down count increases as the temperature increases before 400 °C but reduces unceasingly as the temperature increases after 400 °C;the specimens present obvious plastic failure characteristic after 600 °C,the accumulative ring-down counts decrease obviously and conform to the stress-strain curve.
The mechanical properties and acoustic emission evolution process of limestone under the action of high temperature load were investigated by combining the methods of acoustic emission technique and uniaxial compression test.The temperature varies in the range of 100,200,400,600 and 800 °C.Acoustic emission characteristic parameters and the mechanical parameter under different temperatures were analyzed.The results show that the temperature affects the acoustic emission phenomenon of limestone obviously,the peak stress decreases as the temperature increases and drops by 50 percent from 600 °C to 800 °C,but the peak strain changes not obviously;the average accumulative ring-down count increases as the temperature increases before 400 °C but reduces unceasingly as the temperature increases after 400 °C;the specimens present obvious plastic failure characteristic after 600 °C,the accumulative ring-down counts decrease obviously and conform to the stress-strain curve.
引文
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[2]吴刚,邢爱国,张磊.砂岩高温后的力学特征[J].岩石力学与工程学报,2007,26(10):2110-2116.WU Gang,XING Ai-guo,ZHANG Lei.Mechanicalcharacteristics of sandstone after high temperature[J].Chinese Journal of Rock Mechanics and Engineer-ing,2007,26(10):2110-2116.
[3]杜守继,刘华,职洪涛,等.高温后花岗岩力学性能的试验研究[J].岩石力学与工程学报,2004,23(14):2359-2364.DU Shou-ji,LIU Hua,ZHI Hong-tao,et al.Testingstudy on mechanical properties of post high tempera-ture granite[J].Chinese Journal of Rock Mechanicsand Engineering,2004,23(14):2359-2364.
[4]王颖轶,张宏君,黄醒春,等.高温作用下大理岩应力-应变全过程的试验研究[J].岩石力学与工程学报,2002,21(增2):2345-2349.WANG Ying-yi,ZHANG Hong-jun,HUANG Xing-chun,et al.Experimental study on whole stress-strainin course of marble under the action of high tempera-ture[J].Chinese Journal of Rock Mechanics and Engi-neering,2002,21(Sup.2):2345-2349.
[5]何国梁,吴刚,黄醒春,等.砂岩高温前后超声特性的试验研究[J].岩土力学,2007,28(4):779-784.HE Guo-liang,WU Gang,HUANG Xing-chun,et al.Testing study on ultrasonic properties of limestonebefore and after high temperature[J].Rock and SoilMechanics,2007,28(4):779-784.
[6]MAO Xian-biao,ZHANG Lian,LI Tian-zhen,et al.Properties of failure mode and thermal damage forlimestone at high temperature[J].Mining Scienceand Technology,2009,19:290-294.
[7]CHEN Lun-jian,HE Jun,CHAO Jun-qi,et al.Swell-ing and breaking characteristics of limestone underhigh temperatures[J].Mining Science and Technolo-gy,2009,19:503-507.
[8]Kilic O.The influence of high temperatures on lime-stone P-wave velocity and Schmidt hammer strength[J].International Journal of Rock Mechanics andMining Sciences,2006,43:980-986.
[9]谢卫红,高峰,李顺才,等.石灰岩热损伤破坏机制研究[J].岩土力学,2007,28(5):1021-1025.XIE Wei-hong,GAO Feng,LI Shun-cai,et al.Studyon mechanism of thermal damage fracture for lime-stone[J].Rock and Soil Mechanics,2007,28(5):1021-1025.
[10]李庶林,尹贤刚,王泳嘉,等.单轴受压岩石破坏全过程声发射特征研究[J].岩石力学与工程学报,2004,23(15):2499-2503.LI Shu-lin,YIN Xian-gang,WANG Yong-jia,et al.Studies on acoustic emission characteristics of uniaxialcompressive rock failure[J].Chinese Journal of RockMechanics and Engineering,2004,23(15):2499-2503.
[11]李俊平,余志雄,周创兵,等.水力耦合下岩石的声发射特征试验研究[J].岩石力学与工程学报,2006,25(3):492-498.LI Jun-ping,YU Zhi-xiong,ZHOU Chuang-bing,etal.Experimental study of acoustic emission charac-teristics of rock concerning hydro mechanical coupling[J].Chinese Journal of Rock Mechanics and Engineer-ing,2006,25(3):492-498.
[12]蒋海昆,张流,周永胜.地壳不同深度温压条件下花岗岩变形破坏及声发射时序特征[J].地震学报,2000,22(4):395-403.JIANG Hai-kun,ZHANG Liu,ZHOU Yong-sheng.Granite deformation and behavior of acoustic emissionsequence under the temperature and pressure condi-tion in different crust depths[J].ACT SeismologicalSinica,2000,22(4):395-403.
[13]武晋文,赵阳升,万志军,等.中高温三轴应力下鲁灰花岗岩热破裂声发射特征的试验研究[J].岩土力学,2009,30(11):3331-3336.WU Jin-wen,ZHAO Yang-sheng,WAN Zhi-jun,etal.Experimental study of acoustic emission charac-teristics of granite thermal cracking under middle-hightemperature and triaxial stress[J].Rock and SoilMechanics,2009,30(11):3331-3336.
[14]潘文革,矫桂琼,王波,等.声发射技术在三维编织C/SiC复合材料拉伸损伤分析中的应用[J].无机材料学报,2004,19(4):871-875.PAN Wen-ge,JIAO Gui-qiong,WANG Bo,et al.Characterizing damage evolution of three-dimensionalbraided C/SiC composite with AE technology[J].Journal of Inorganic Materials,2004,19(4):871-875.
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