Dynamic evolution of shear rate-dependent behavior of rock discontinuity under shearing condition

Abstract

Rock blocks sliding along discontinuities can cause serious disasters, such as landslides, earthquakes, or rock bursts. The shear rate-dependent behavior is a typical time-dependent behavior of a rock discontinuity, and it is closely related to the stability of a rock block. To further study the shear rate-dependent behavior of rock discontinuities, shear tests with alternating shear rates (SASRs) were conducted on rock discontinuities with various surface morphologies. The dynamic evolution of the shear rate dependency was studied in detail based on the shear test results, and three stages were identified with respect to the shear stress and shear deformation states. The test results revealed that dynamic changes in shear stiffness and the energy storage abilities of the rock discontinuities occurred in relation to the shear rate-dependent behavior of crack growth, which increased with an increase in normal stress and/or the joint roughness coefficient. The stage of decreasing shear stiffness corresponded to a stage of noticeable shear rate-dependency, and the shear rate was found to have no influence on the initial crack stress.

Keywords

shear rate-dependent behavior / rock discontinuity / dynamic evolution / initial crack stress

References

[1] GombergJ, BeelerN M, BlanpiedM L, BodinP. Earthquake triggering by transient and static deformations. Journal of Geophysical Research: Solid Earth, 1998, 103(B10): 24411-24426

[2] OppikoferT, JaboyedoffM, BlikraL, DerronM H, MetzgerR. Characterization and monitoring of the Åknes rockslide using terrestrial laser scanning. Natural Hazards and Earth System Sciences, 2009, 9(3): 1003-1019

[3] ArakiE, SafferD M, KopfA J, WallaceL M, KimuraT, MachidaY, IdeS, DavisE. Recurring and triggered slow-slip events near the trench at the Nankai Trough subduction megathrust. Science, 2017, 356(6343): 1157-1160

[4] JaramilloC A. Impact of seismic design on tunnels in rock-Case histories. Underground Space, 2017, 2(2): 106-114

[5] ChenB-r, FengX-t, MingH-j, ZhouH, ZengX-h, FengG-l, XiaoY-X. Evolution law and mechanism of rockburst in deep tunnel: Time delayed rockburst. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(3): 561-569

[6] BykovV G. Strain waves in the Earth: Theory, field data, and models. Russian Geology and Geophysics, 2005, 46(11): 1176-1190

[7] FahimifarA, SoroushH. Effect of time on the stress-strain behaviour of a single rock joint. Bulletin of Engineering Geology and the Environment, 2005, 64(4): 383-396

[8] PATERSON M S, WONG T F. Friction and sliding phenomena [M]// Experimental Rock Deformation—The Brittle Field. Berlin, Heidelberg: Springer-Verlag, 165–209. DOI: https://doi.org/10.1007/3-540-26339-x_8.

[9] BraceW F, ByerleeJ D. Stick-slip as a mechanism for earthquakes. Science, 1966, 153(3739): 990-992

[10] DieterichJ H. Time-dependent friction in rocks. Journal of Geophysical Research Atmospheres, 1972, 77(20): 3690-3697

[11] ScholzC HThe mechanics of earthquakes and faulting, 1990, Cambrige, Cambrige University Press, 739117(1)

[12] ReberJ E, HaymanN W, LavierL L. Stick-slip and creep behavior in lubricated granular material: Insights into the brittle-ductile transition. Geophysical Research Letters, 2014, 41(10): 3471-3477

[13] JafariM K, Amini HosseiniK, PelletF, BoulonM, BuzziO. Evaluation of shear strength of rock joints subjected to cyclic loading. Soil Dynamics and Earthquake Engineering, 2003, 23(7): 619-630

[14] MirzaghorbanaliA, NemcikJ, AzizN. Effects of shear rate on cyclic loading shear behavior of rock joints under constant normal stiffness conditions. Rock Mechanics and Rock Engineering, 2014, 47(5): 1931-1938

[15] ZhouH, MengF-z, ZhangC-q, YangF-j, LuJ-J. The shear failure characteristic of the structural plane and its application in the study of slip rock burst. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(9): 1729-1738

[16] CrawfordA M, CurranJ H. The influence of shear velocity on the frictional resistance of rock discontinuities. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1981, 18(6): 505-515

[17] AtapourH, MoosaviM. The influence of shearing velocity on shear behavior of artificial joints. Rock Mechanics and Rock Engineering, 2014, 47(5): 1745-1761

[18] ZhengB-w, QiS-w, ZhanZ-f, et al.. Effect of shear rate on the strength characteristics of rock joints. Journal of Earth Sciences and Environment, 2015, 37(5): 101-110

[19] WangZ, GuL-l, ShenM-r, ZhangF, ZhangG-k, DengS-X. Influence of shear rate on the shear strength of discontinuities with different joint roughness coefficients. Geotechnical Testing Journal, 2020, 43(3): 20180291

[20] HashibaK, OkuboS, FukuiK. A new testing method for investigating the loading rate dependency of peak and residual rock strength. International Journal of Rock Mechanics and Mining Sciences, 2006, 436894-904

[21] PATTON F D. Multiple modes of shear failure in rock.1st ISRM Congress [C]// The 1st Congress of the International Society of Rock Mechanics. Lisbon. 1966: 509–513.

[22] EinsteinH H, VenezianoD, BaecherG B, O’ReillyK J. The effect of discontinuity persistence on rock slope stability. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1983, 20(5): 227-236

[23] WangZ, GuL-l, ShenM-r, ZhangF, ZhangG-k, WangX. Shear stress relaxation behavior of rock discontinuities with different joint roughness coefficient and stress histories. Journal of Structural Geology, 2019, 126: 272-285

[24] BartonN. Suggested methods for the quantitative description of discontinuities in rock masses. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1979, 16(2): 22

[25] ConteS D, de BoorElementary numerical analysis (an algorithmic approach), 1972, New York, McGraw-Hill College

[26] PotyondyD O. Simulating stress corrosion with a bonded-particle model for rock. International Journal of Rock Mechanics and Mining Sciences, 2007, 445677-691