静载下花岗岩破坏的声发射特性研究
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摘要
在声发射试验系统上,进行了花岗岩声发射实验,获得了静载下花岗岩破坏的声发射规律。结果表明,在加载初期,出现了一定量的声发射信号,声发射计数最大达到2 000,这对应着岩石初始裂纹的闭合段;随着应力继续增大,声发射能量增大量较小,声发射计数逐步增大至峰值,这对应着岩石弹性段;岩石进入损伤阶段后,声发射能量迅速增大,在应力最高点附近,声发射能量达到峰值,而声发射计数却下降至较低值,这种低频大试件往往意味着结构的破坏。
The AE experiments of granite were made on the AE test systems and the AE law under static loading is obtained.The results show that the AE information is rich and the AE counts reach 2000 in the initial stage,which corresponds to rock initial cracks closure;AE energy increment is small and AE counts increases gradually with the stress increasing,which corresponds to rock elastic stage;when rock enter damage stage,AE energy increases rapidly and reaches peak value near the stress peak,but AE energy peak does not correspond to AE counts peak.
The AE experiments of granite were made on the AE test systems and the AE law under static loading is obtained.The results show that the AE information is rich and the AE counts reach 2000 in the initial stage,which corresponds to rock initial cracks closure;AE energy increment is small and AE counts increases gradually with the stress increasing,which corresponds to rock elastic stage;when rock enter damage stage,AE energy increases rapidly and reaches peak value near the stress peak,but AE energy peak does not correspond to AE counts peak.
引文
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[2]余怀忠,尹祥础,夏蒙棼,等.地震临界点理论的实验研究[J].地震学报,2004,26(增刊):122-130.
[3]纪洪广,蔡美峰.混凝土材料声发射与应力-应变参量耦合关系及应用[J].岩石力学与工程学报,2003,22(2):227-231.
[4]马胜利,蒋海昆,扈小燕,等.基于声发射实验结果讨论大震前地震活动平静现象的机制[J].地震地质,2004,26(3):426-435.
[5]PRIKRYL R,LOKAJICEK T,LI C,et al.AcousticEmission Characteristics and Failure of UniaxiallyStressed Granitic Rocks:the Effect of Rock Fabric[J].Rock Mech.Rock Engng,2003,36(4):255-270
[6]Rudajev V,Vilhel mJ,Lokajicek T.Laboratory studiesof acoustic emission prior to uniaxial compressive rockfailure[J].International journal of rock mechanics andmining sciences,2000,37:699-704.
[7]CHANG S H,LEE C I.Esti mation of cracking anddamage mechanisms in rock under Triaxial compressionby moment tensor analysis of acoustic emission[J].In-ternational Journal of Rock Mechanics&Mining Scienc-es,2004,41:1069-1086.
[8]王恩元,何学秋.煤岩变形破裂电磁辐射的实验研究[J].地球物理学报,2000,43(1):131-137.
[9]曹惠馨,钱书清,吕智.岩石破裂过程中超长波段的电、磁信号和声发射的实验研究[J].地震学报,1994,16(2):235-241.
[10]钱书清,郝锦绮,周建国,等.1999年9月21日台湾集集Ms7.4地震前ULF电磁信号及其与模拟试验结果的比较[J].地震学报,2001,23(3):322-327.
[11]钱书清,郝锦绮,周建国,等.岩石受压破裂的ULF和LF电磁前兆信号[J].中国地震,2003,19(2):109-116.
[12]李夕兵,古德生,赖海辉.爆炸应力波遇夹层后的能量传递效果[J].有色金属,1993,45(4):3-8.
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