剪切速率对平直节理摩擦行为的影响及其机制研究

doi:10.13722/j.cnki.jrme. 2021.0225

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1703 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要认识平直岩石节理的摩擦行为是研究起伏、粗糙节理剪切力学性能的基础，对预防洞室失稳、边坡滑坡也具有重要意义。为探究平直节理的摩擦行为与剪切速率的相关关系，首先对类岩石人工节理进行5种剪切速率下的直剪试验，分析剪切强度、摩擦因数、剪切刚度、节理面磨损随剪切速率的变化；然后，结合颗粒离散元模拟方法，从节理接触的角度分析了剪切速率对节理摩擦因数的部分影响机制。试验结果表明，随着剪切速率的增大，节理剪切强度和刚度均呈现减小的趋势，且减小的幅度逐渐减弱；不同法向压力作用下，剪切强度和剪切刚度随剪切速率的变化趋势基本一致；节理摩擦因数与剪切速率的对数呈负相关，拟合得到相应的经验模型；节理面的摩擦划痕深度随剪切速率的增大而减小，磨损面积受剪切速率的影响较小。模拟结果表明，随着剪切速率的增大，节理接触的中心点位置出现偏移，颗粒的接触重叠量减小，从而引起接触剪切力减小，宏观表现为节理剪切强度和摩擦因数的降低。剪切速率的增大，导致节理表面微凸体磨损深度减小，这是剪切速率对节理摩擦行为的一个重要影响机制。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	袁伟1
	李建春1
	2

关键词 ：岩石力学, 平直节理, 剪切速率, 剪切强度, 摩擦因数, 节理接触

Abstract：Understanding the friction behavior of planar rock joints is the basis for exploring the shear mechanical properties of undulating joints and rough joints. It is also of great significance for preventing caverns from instability and slope landslides. To explore the relationship between the friction behavior and the shear rate，firstly，artificial rock joints are subjected to direct shear tests at 5 shear rates；and then，variations in shear strength，friction coefficient，shear stiffness and joint surface abrasion with shear rate are analyzed. Finally，combined with the particle discrete element method，the effect mechanism of shear rate on friction coefficient is analyzed from the perspective of contact shift. Tested results show that with the increase of shear rate，shear strength and stiffness show a decreasing trend，and the decreasing amplitude gradually weakens. Under different normal pressures，similar increasing trends of shear strength and stiffness can be observed. The friction coefficient of a joint surface and the logarithm of shear rate are negatively correlated，and the corresponding empirical model is obtained by regression. The scratch depth of a joint surface tends to decrease with the increase of shear rate. The abrasion area may be less affected by shear rate. Simulated results show that the increased shear rates shift the position of center points of the joint contacts. Therefore，the contact overlap of particles decreases，resulting in a decrease in the contact shear force. The macroscopic manifestation is a decrease in the shear strength and the friction coefficient. The increase of shear rate leads to a decrease of abrasion depth of asperities on the joint surface，which is an important effect mechanism of shear rate on the friction behavior of joints.

Key words： rock mechanics planar joint shear rate shear strength friction coefficient joint contact

引用本文:

袁伟1，李建春1，2. 剪切速率对平直节理摩擦行为的影响及其机制研究[J]. 岩石力学与工程学报, 2021, 40(S2): 3241-3252.
YUAN Wei1，LI Jianchun1，2. Study on the effects and its mechanism of shear rate on friction of planar joints. , 2021, 40(S2): 3241-3252.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme. 2021.0225 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS2/3241

[3]	赵坚. 岩石节理剪切强度的JRC-JMC新模型[J]. 岩石力学与工程学报，1998，17(4)：1-9.(ZHAO Jian. A new JRC-JMC shear strength criterion for rock joint[J]. Chinese Journal of Rock Mechanics and Engineering，1998，17(4)：1-9.(in Chinese))
[29]	BAHAADDINI M，SHARROCK G，HEBBLEWHITE B K. Numerical direct shear tests to model the shear behaviour of rock joints[J]. Computers and Geotechnics，2013，51：101-115.
[24]	BARTON N，CHOUBEY V. The shear strength of rock joints in theory and practice[J]. Rock Mechanics，1977，(10)：1-54.
[1]	KANG J，ZHU J，ZHAO J. A review of mechanisms of induced earthquakes：from a view of rock mechanics[J]. Geomechanics and Geophysics for Geo-Energy and Geo-Resources，2019，5(2)：171-196.
[4]	夏才初，孙宗颀. 工程岩体节理力学[M]. 上海：同济大学出版社，2002：4-5.(XIA Caichu，SUN Zongqi. Mechanics of engineering jointed rock mass[M]. Shanghai：Tongji University Press，2002：4-5.(in Chinese))
[6]	LI Y，WU W，LI B. An analytical model for two-order asperity degradation of rock joints under constant normal stiffness conditions [J]. Rock Mechanics and Rock Engineering，2018，51(5)：1 431-1 445.
[9]	CRAWFORD A M，CURRAN J H. The influence of shear velocity on the frictional resistance of rock discontinuities[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1981，18(6)：505-515.
[11]	ATAPOUR H，MOOSAVI M. The influence of shearing velocity on shear behavior of artificial joints[J]. Rock Mechanics and Rock Engineering，2013，47(5)：1 745-1 761.
[14]	李海波，冯海鹏，刘博. 不同剪切速率下岩石节理的强度特性研究[J]. 岩石力学与工程学报，2006，25(12)：2 435-2 440.(LI Haibo，FENG Haipeng，LIU Bo. Study on strength behaviors of rock joints under different shearing deformation velocities[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 435-2 440.(in Chinese))
[16]	王刚，张学朋，蒋宇静，等. 一种考虑剪切速率的粗糙结构面剪切强度准则[J]. 岩土工程学报，2015，37(8)：1 399-1 404.(WANG Gang，ZHANG Xuepeng，JIANG Yujing，et al. New shear strength criterion for rough rock joints considering shear velocity[J]. Chinese Journal of Geotechnical Engineering，2015，37(8)：1 399-1 404.(in Chinese))
[19]	DANG W，KONIETZKY H，CHANG L，et al. Velocity-frequency-amplitude-dependent frictional resistance of planar joints under dynamic normal load(DNL) conditions[J]. Tunnelling and Underground Space Technology，2018，79：27-34.
[21]	MURALHA J，GRASSELLI G，TATONE B，et al. ISRM suggested method for laboratory determination of the shear strength of rock joints：revised version[J]. Rock Mechanics and Rock Engineering，2013 47(Supp.1)：291-302.
[26]	ZHAO J. Joint surface matching and shear strength part B-JRC-JMC shear strength criterion[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(2)：179-185.
[2]	沈明荣，张清照. 规则齿型结构面剪切特性的模型试验研究[J]. 岩石力学与工程学报，2010，29(4)：713-719.(SHEN Mingrong，ZHANG Qingzhao. Experimental study of shear deformation characteristics of rock mass discontinuities[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(4)：713-719.(in Chinese))
[12]	LI H H. Mechanical responses of rock joints with regular asperities under various shear rates investigated by double shear test[J]. Journal of Testing and Evaluation，2017，45(2)：470-483.
[22]	JAEGER J C，COOK N G W，ZIMMERMAN R. Fundamentals of rock mechanics[M]. [S. l.]：John Wiley and Sons，2009：65-67.
[10]	BARBERO M，BARLA G，ZANINETTI A. Dynamic shear strength of rock joints subjected to impulse loading[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1996，33(2)：141-151.
[20]	郑博文，祁生文，詹志发，等. 剪切速率对岩石节理强度特性的影响[J]. 地球科学与环境学报，2015，37(5)：101-110.(ZHENG Bowen，QI Shengwen，ZHAN Zhifa，et al. Effect of shear rate on the strength characteristics of rock joints[J]. Journal of Earth Sciences and Environment，2015，37(5)：101-110.(in Chinese))
[8]	DIETERICH J H. Time-dependent friction and mechanics of stick-slip[J]. Pure and Applied Geophysics，1978，116(4/5)：790-806.
[18]	TANG Z，WONG L. Influences of normal loading rate and shear velocity on the shear behavior of artificial rock joints[J]. Rock Mechanics and Rock Engineering，2015，49(6)：2 165-2 172.
[28]	Itasca Consulting Group Inc.. PFC(particle flow code)[R]. [S. l.]：[s. n.]，2014.
[5]	朱小明，李海波，刘博，等. 含一阶和二阶起伏体节理剪切强度的试验研究[J]. 岩石力学与工程学报，2011，30(9)：1 810-1 818. (ZHU Xiaoming，LI Haibo，LIU Bo，et al. Experimental study of shear strength of joints with first-order and second-order asperities[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(9)：1 810-1 818.(in Chinese))
[15]	ZHOU H，MENG F，ZHANG C，et al. Investigation of the acoustic emission characteristics of artificial saw-tooth joints under shearing condition[J]. Acta Geotechnica，2016，11(4)：925-939.
[25]	ZHAO J. Joint surface matching and shear strength part A-joint matching coefficient(JMC)[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(2)：173-178.
[7]	DIETERICH J H. Time-dependent friction in rocks[J]. Journal of Geophysical Research，1972，77(20)：3 690-3 697.
[17]	MENG F，WONG L N Y，ZHOU H，et al. Shear rate effects on the post-peak shear behaviour and acoustic emission characteristics of artificially split granite joints[J]. Rock Mechanics and Rock Engineering，2019，52(7)：2 155-2 174.
[27]	李晓锋，李海波，夏祥，等. 类节理岩石直剪试验力学特性的数值模拟研究[J]. 岩土力学，2016，37(2)：583-591.(LI Xiaofeng，LI Haibo，XIA Xiang，et al. Numerical simulation of mechanical characteristics of jointed rock in direct shear test[J]. Rock and Soil Mechanics，2016，37(2)：583-591.(in Chinese))
[13]	刘婷婷，李建春，李海波，等. 剪切速率对平直充填节理的剪切力学特性影响研究[J]. 岩土力学，2017，38(7)：1 967-1 973.(LIU Tingting，LI Jiangchun，LI Haibo，et al. Influence of shearing velocity on shear mechanical properties of planar filled joints[J]. Rock and Soil Mechanics，2017，38(7)：1 967-1 973.(in Chinese))
[23]	PÉREZ-REY I，BASTANTE F G，ALEJANO L R，et al. Influence of microroughness on the frictional behavior and wear response of planar saw-cut rock surfaces[J]. International Journal of Geomechanics，2020，20(8)：04020118.