永川煤矿T_3xj~4砂岩声发射特性及Felicity效应研究
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摘要
在单轴和循环加载条件下对永川煤矿砂岩损伤破坏全过程的声发射特性进行了系统研究,结果表明:砂岩声发射类型与MOGI-I相似,应力应变全过程曲线对应的Kaiser点、屈服点及峰值点处声发射信号明显;随着循环加载水平的增加,不同轴向应力和轴向应变阶段对应的Felicity效应比值越来越小,反映了岩石损伤程度的增加。
Acoustic emission characteristics of damage and failure process of Yongchuan Coal Mine sand rock under uniaxial pressure and cyclic loading were studied,the results show that sand rock is similar to MOGI-I in acoustic emission characteristics,the acoustic emission signal was obvious in Kaiser point,yield point and peak point of the complete stress-strain process curve;The ratio of Felicity effect under different axial pressure and strain stage was smaller and smaller when the level of cyclic loading was higher and higher,which mean that the damage degree of the sand rock was higher and higher.
Acoustic emission characteristics of damage and failure process of Yongchuan Coal Mine sand rock under uniaxial pressure and cyclic loading were studied,the results show that sand rock is similar to MOGI-I in acoustic emission characteristics,the acoustic emission signal was obvious in Kaiser point,yield point and peak point of the complete stress-strain process curve;The ratio of Felicity effect under different axial pressure and strain stage was smaller and smaller when the level of cyclic loading was higher and higher,which mean that the damage degree of the sand rock was higher and higher.
引文
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[2]LI C.E Nordlund Experimental verification of the Kaiser effect in rocks[J].Rock Mechanics and Rock Engineering,1993,26(4):333-351
[3]赵兴东,李元辉,袁瑞甫.花岗岩Kaiser效应的实验验证与分析[J].东北大学学报(自然科学版),2007,28(2):254-257
[4]杨明纬.声发射检测[M].北京:机械工业出版社,2005
[5]PAPARGYRI S,COOKE R G,PAPARGYRI S A,et al.The acoustic behaviour of bricks in relation to their mechanical behaviour[J].Construction and Building Materials,20011,5(7):361-369
[6]谢强,江小城,余贤斌,等.加载方向变化对细晶花岗岩凯塞效应的影响[J].煤炭学报,20103,5(10):1627-1632
[7]WANG H T,XIAN X F,YING G Z.A new method of determining geostresses by the acoustic emission Kaiser effect[J].International Journal of Rock mechanics and Mining Sciences,2004,37:534-547
[8]陈勉,张艳,金衍,等.加载速率对不同岩性岩石Kaiser效应影响的试验研究.岩石力学与工程学报,2009,28(增1):2599-2604
[9]刘建新.岩石破裂声发射实验研究[D].中国地震局地球物理研究所,2002
[10]纪洪广,李造鼎.混凝土材料凯瑟效应和Felicity效应关系的实验研究[J].应用声学,1997,16(6):30-33
[11]李楠,王恩元,赵恩来,等.岩石循环加载和分级加载损伤破坏声发射实验研究[J]煤炭学报,20103,5(7):1099-1103
[12]BOYCE G M,MCCABE W M,KOEMER R M.Acoustic Emission Signatures of Various Rock Types in Unconfined Compression[C].In:Drnevich V P,Gray R E,eds.Acoustic Emissions in Geotechnical Engineering Practice.ASTM STP,19811,42-154
[13]唐晓军.循环载荷作用下岩石损伤演化规律研究[D].重庆:重庆大学,2008
[14]葛修润,卢应发.循环载荷作用下岩石疲劳破坏和不可逆变形问题的探讨[J].岩土工程学报,199,214(3):56-60
[15]郭臣业.岩石和瓦斯突出机理及发生条件研究[D].重庆:重庆大学,2010
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