Shear behavior of planar rock joints under Dynamic Normal Load (DNL) conditions

被引：0
作者：
Dang, W. [1 ]
Konietzky, H. [1 ]
Fruehwirt, T. [1 ]
机构：
[1] TU Bergakad Freiberg, Geotech Inst, Freiberg, Germany
来源：
ROCK DYNAMICS - EXPERIMENTS, THEORIES AND APPLICATIONS | 2018年
关键词：
ASPERITY DEGRADATION; MECHANICAL-BEHAVIOR; MODEL; FREQUENCY; SANDSTONE; STRENGTH;
D O I：
暂无
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
The effect of Dynamic Normal Load (DNL) on the direct shear behavior of planar joints has been investigated using a dynamic direct shear box device. The shear tests were investigated under different shear velocities, vertical impact frequencies, vertical impact amplitudes and normal load levels. Lab test results show, that the shear force and dynamic friction coefficient show cyclic behavior. Two significant time shifts between peak normal force and peak shear force with peak shear force delay as well as between peak normal force and peak friction coefficient with peak shear force delay are observed. The peak value of dynamic friction coefficient is nearly identical with the static friction coefficient. The minimum value of the dynamic friction coefficient may increase or decrease depending on velocity-frequency (VF), velocity-amplitude (VA) and velocity-frequency-amplitude (VFA) parameters. Finally, a new shear strength criterion is proposed for a planar joint under DNL conditions.
引用
收藏
页码：59 / 64
页数：6
相关论文
共 31 条
[1]  
[Anonymous], 2013, THESIS
[2]   Over-consolidation effect on shear behavior of rock joints [J].
Babanouri, Nima ;
Nasab, Saeed Karimi ;
Baghbanan, Alireza ;
Mohamadi, Hamid Reza .
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, 2011, 48 (08) :1283-1291
[3]   Waveform effect on fatigue properties of intact sandstone in uniaxial cyclical loading [J].
Bagde, MN ;
Petros, V .
ROCK MECHANICS AND ROCK ENGINEERING, 2005, 38 (03) :169-196
[4]   Experimental and numerical study of asperity degradation in the direct shear test [J].
Bahaaddini, M. ;
Hagan, P. C. ;
Mitra, R. ;
Khosravi, M. H. .
ENGINEERING GEOLOGY, 2016, 204 :41-52
[5]   Numerical Study of the Mechanical Behavior of Nonpersistent Jointed Rock Masses [J].
Bahaaddini, M. ;
Hagan, P. ;
Mitra, R. ;
Hebblewhite, B. K. .
INTERNATIONAL JOURNAL OF GEOMECHANICS, 2016, 16 (01)
[6]   Parametric Study of Smooth Joint Parameters on the Shear Behaviour of Rock Joints [J].
Bahaaddini, M. ;
Hagan, P. C. ;
Mitra, R. ;
Hebblewhite, B. K. .
ROCK MECHANICS AND ROCK ENGINEERING, 2015, 48 (03) :923-940
[7]   Scale effect on the shear behaviour of rock joints based on a numerical study [J].
Bahaaddini, M. ;
Hagan, P. C. ;
Mitra, R. ;
Hebblewhite, B. K. .
ENGINEERING GEOLOGY, 2014, 181 :212-223
[8]   Numerical direct shear tests to model the shear behaviour of rock joints [J].
Bahaaddini, M. ;
Sharrock, G. ;
Hebblewhite, B. K. .
COMPUTERS AND GEOTECHNICS, 2013, 51 :101-115
[9]   Numerical investigation of the effect of joint geometrical parameters on the mechanical properties of a non-persistent jointed rock mass under uniaxial compression [J].
Bahaaddini, M. ;
Sharrock, G. ;
Hebblewhite, B. K. .
COMPUTERS AND GEOTECHNICS, 2013, 49 :206-225
[10]  
Barton N., 1977, Rock Mechanics, V10, P1, DOI 10.1007/BF01261801
1234