岩体损伤破坏过程三维定位声发射试验分析
|
摘要
岩石类材料的破坏是一种能量累积损伤过程,在力学上是宏观缺陷产生与扩展的累积过程。对完整岩石先进行了单轴压缩试验,在压缩试验的同时,使用声发射试验仪器记录下岩样的声发射参数。试验测试了不同岩性试样的损伤破坏过程,试验结果表明,岩石的应力和声发射变化率之间的关系具有三个阶段:不明显变化阶段、明显变化阶段、破坏前阶段。与此相对应,岩石声发射事件数和加载时间也具有三个阶段:声发射事件缓慢增长阶段、声发射事件稳定增长阶段、声发射事件高速增长阶段。在不同尺寸岩石的声发射试验中,发现不同尺寸对岩样的破坏形态影响不明显。尺寸较小的岩样进入声发射事件明显变化阶段的时间比尺寸较大的岩样早。
The damage and failure of rock-like material is the process of accumulation of energy,which is also the cumulative process of macro defect generation and expand in mechanics.First,the uniaxial compression test is performed on the intact rock.During the compression test,the AE technology is used to record the parameters of rock.The rock samples of different lithology characters of damage process are tested.The experimental results show that the relationship between the rock stress and the AE rate has three distinct phases:unconspicuous change stage,obvious change stage and proceeding destruction stage.At the same time,the corresponding stages of rock AE events number and loading time are also three,namely,slow increasing stage of AE events,the stable growth stage of AE events and the rapid growth stage of AE events.Tests show that different dimensions of the rock have little effect on the form of damage and failure of rock and smaller rock samples have a shorter time into the phase of obvious change AE events than the larger size rock.
The damage and failure of rock-like material is the process of accumulation of energy,which is also the cumulative process of macro defect generation and expand in mechanics.First,the uniaxial compression test is performed on the intact rock.During the compression test,the AE technology is used to record the parameters of rock.The rock samples of different lithology characters of damage process are tested.The experimental results show that the relationship between the rock stress and the AE rate has three distinct phases:unconspicuous change stage,obvious change stage and proceeding destruction stage.At the same time,the corresponding stages of rock AE events number and loading time are also three,namely,slow increasing stage of AE events,the stable growth stage of AE events and the rapid growth stage of AE events.Tests show that different dimensions of the rock have little effect on the form of damage and failure of rock and smaller rock samples have a shorter time into the phase of obvious change AE events than the larger size rock.
引文
[1]王述红,张亚兵,张楠,等.各向异性岩体破坏过程声发射测量及其定位试验研究[J].东北大学学报(自然科学版),2007,28(7):1033.1036.
[2]唐春安.岩石破裂过程声发射规律的数值模拟初探[J].岩石力学与工程学报,1997,16(40):368.374.
[3]唐春安,王述红,傅宇方.岩石破裂过程数值试验[M].北京:科学出版社,2003.
[4]徐珂.混凝土—岩石两体损伤破坏及变形规律的研究[D].西华大学,2007.
[5]Fedorow,V.V.Regression problems with controllable variables subject to error[J].Biometrika,1974(61):49.55.
[6]蒋海昆,张流,王琦.实验室声发射三维定位及标本波速场各向异性研究[J].地震,1999,19(3):245.249.
[7]M.H.B.Nasseri,B.Mohanty,R.P.Young.Fracture Toughness Measurements and Acoustic Emission Ac.tivity in Brittle Rocks[J].Pure and Applied Geophys.ics.2006,(163):917.945.
[8]赵兴东,李元辉,刘建坡,等.基于声发射及其定位技术的岩石破裂过程研究[J].岩石力学与工程学报,2008,27(5):990.995.
[9]赵兴东,田军,李元辉,等.花岗岩破裂过的声发射活动性研究[J].中国矿业,2006,15(7):74.76.
[10]S.H.Wang,C.I.Lee,P.G.Ranjith,C.A.Tang.Modeling the Effects of Heterogeneity and Anisotro.py on the Excavation Damaged//Disturbed Zone(EDZ)[J].Rock Mechanics and Rock Engineering,2009,42:229.258.
[2]唐春安.岩石破裂过程声发射规律的数值模拟初探[J].岩石力学与工程学报,1997,16(40):368.374.
[3]唐春安,王述红,傅宇方.岩石破裂过程数值试验[M].北京:科学出版社,2003.
[4]徐珂.混凝土—岩石两体损伤破坏及变形规律的研究[D].西华大学,2007.
[5]Fedorow,V.V.Regression problems with controllable variables subject to error[J].Biometrika,1974(61):49.55.
[6]蒋海昆,张流,王琦.实验室声发射三维定位及标本波速场各向异性研究[J].地震,1999,19(3):245.249.
[7]M.H.B.Nasseri,B.Mohanty,R.P.Young.Fracture Toughness Measurements and Acoustic Emission Ac.tivity in Brittle Rocks[J].Pure and Applied Geophys.ics.2006,(163):917.945.
[8]赵兴东,李元辉,刘建坡,等.基于声发射及其定位技术的岩石破裂过程研究[J].岩石力学与工程学报,2008,27(5):990.995.
[9]赵兴东,田军,李元辉,等.花岗岩破裂过的声发射活动性研究[J].中国矿业,2006,15(7):74.76.
[10]S.H.Wang,C.I.Lee,P.G.Ranjith,C.A.Tang.Modeling the Effects of Heterogeneity and Anisotro.py on the Excavation Damaged//Disturbed Zone(EDZ)[J].Rock Mechanics and Rock Engineering,2009,42:229.258.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心