岩石压剪断裂过程中的超声波波谱特性研究

陈枫; 孙宗颀; 徐纪成

岩石压剪断裂过程中的超声波波谱特性研究

中南工业大学测试中心力学开放实验室,长沙410083

基金项目:

国家自然科学基金资助项目(编号:49672164)

详细信息

作者简介:
陈枫(1949-),男,在职博士,主要研究岩石断裂力学,边界元,权函数方法.

中图分类号: TU459.3
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出版历程
- 收稿日期: 1998-08-10
- 修回日期: 1999-05-10
- 刊出日期: 2000-04-22

STUDY ON THE CHARACTERISTICS OF ULTRASONIC WAVE SPECTUM IN CRACKED ROCK SPECIMEN ON COMPRESSIVE-SHEAR LOADING

Opening Lab of Mechanics, Testing Center, Central South University of Technology, Changsha 410008

摘要

摘要: 岩石破裂过程中的声发射特性不仅与岩石种类有关 ,而且与受到的载荷和破裂进展密切相关 ,岩石受载时的声发射波谱中含有大量与微断裂有关的信息。本文通过岩石压剪加载时峰值前的声发射波谱特性分析 ,探讨了岩石压剪时的微断裂机理 ,揭示了岩石在压剪加载不同阶段的波谱特性与岩石初始非线性、线性响应和临界裂纹扩展之间的相关关系。实验结果表明 ,声发射波谱参数的变化对岩石微断裂进展的响应比载荷本身更为敏感。这一结论为岩石边坡稳定性分析 ,岩爆预测和采矿工程的安全性评估提供了十分有意义的实验依据。
- 岩石压剪断裂 /
- 声发射 /
- 波谱分析
Abstract: The acoustic emission (AE) behavior in the process of rock fracture is not only closely related to the rock types but also to the load and microfracture progress. Thus, AE wave spectrum obtained from loaded rock specimen contains a great amount of information concerning microfracture of rock.The microfracture mechanism of rock under compressive-shear loading is studied using wave-spectrum analysis in this paper. the relation between wave-specturm behavior at different loading stages and mechanical response of rock and critical crack propagation is discussed. The results show that wave-spectrum parameters are more sensitive to microfracture of rock than to load itself, which is quite significant for solving engineering problems, such as safty estimation and rock burst prediction in mining process and slope stability analysis in geological engineering.
- Rock compressive-shear fracture /
- Acoustic emission /
- Wave-spectrum analysis.

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参考文献(1)

[1] 　M.F.A shby and S.D.Hallam.T he f ail ure of brit le soli dscont ai ning s mal l cracks under com pres sive st ress st at es
[J].A CTA.M et al l,1986,34.497～510.

[2] 　E.Z.Lajt ai.Ef fect of t ensil e s t res s gr adient on b rit tl e fract urein itiat ion
[J].Int.J.Rock.M ech.M in.S ci,1972,9.569～578.

[3] 　E.Z.L ajt ai,B.J.Cart er&M.L.A yari.Crit eria f or bri tt lef ract ure in compress ion
[J].Engng.Fract.M ech.,1990,37(1):59～74.

[4] 　蔡光理,刘光,罗津辉.超声波谱法在岩石破裂特性研究中的应用
[J].岩土工程学报,1989,11(3):60～69.Cai Zhongli,L iu G uan g,Luo Jinh ui.T he applicat ion oful t ras onic w ave s pectr um to t he research on t he failurepropert ies of rocks.Chinees Journ al of G eot echn icalEn gineering,1989,11(3):60～69.

[5] 　A.M aji an d S.P.Sh ah.Process zone and acoust ic-emiss ionm easurement s in concret e
[J].Experiment al M echanics,1988,28(1):27～33.

[6] 　D.E.纽兰.随机振动与谱分析概论
[M].北京:机械工业出版社出版,1978.D.E.N ew land.A n random vibr at ion an d s pect ral analys is.T ransl at ed b y Fang Tong.Beijing:M echanical Ind ust ryPress,1978.

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