Abstract

To support the development of centrifuge models to simulate seismic rock slope failures, potential model materials were subjected to direct shear tests to characterize the properties of the interfaces. Three synthetic rock materials were investigated: blocks cast out of a commercially available gypsum cement, blocks cast out of a Nevada sand/gypsum mix, and rock blocks with sandpaper glued to the shear surfaces. The materials were evaluated primarily on the consistency of the measured properties and the observed shear failure behavior. The laboratory direct shear tests were modeled numerically with the software package UDEC to observe how well the numerical results using joint constitutive models available in the software compare to the experimental results. The Coulomb slip joint model predicts the interface behavior well for the gypsum and sand/gypsum materials, which displayed basic elastic-plastic behavior during shear, and the Coulomb slip with residual strength model captured the peak to residual behavior observed in the tests on the sandpaper interfaces. The use of a different joint shear stiffness value for each simulation, corresponding to the measured laboratory value associated with each applied normal stress, clearly contributed to this excellent match; more general models utilizing a constant joint shear stiffness value applied to blocks that are subjected to different normal stresses may not display such close agreement with observed behavior.

References

1.
ASTM D5607-08
:
Standard Test Method for Performing Laboratory Direct Shear Strength Tests of Rock Specimens Under Constant Normal Force
,
Annual Book of ASTM Standards
,
ASTM International
,
West Conshohocken, PA
,
2008
.
2.
Bandis
,
S. C.
,
1990
, “
Mechanical Properties of Rock Joints
,”
Barton
N.
and
Stephansson
O.
, Eds.,
Proceedings of the International Symposium on Rock Joints
,
Loen, Norway
, June 4–6, 1990, pp.
125
140
.
3.
Bandis
,
S. C.
,
Lumsden
,
A. C.
, and
Barton
,
N. R.
,
1983
, “
Fundamentals of Rock Joint Deformation
,”
Int. J. Rock Mech. Min. Sci. Geomech. Abstr.
, Vol.
20
, No.
6
, Balkema, Rotterdam, pp.
249
268
. https://doi.org/10.1016/0148-9062(83)90595-8
4.
Cundall
,
P. A.
,
1971
, “
A Computer Model for Simulating Progressive Large Scale Movements in Blocky Rock Systems
,”
Proceedings of the Symposium of the International Society for Rock Mechanics
, Nancy, France, Oct 4-6,
Institut Francais des Sciences et Technologies des Transports, de l’Aménagement et des Réseaux (IFSTTAR)
,
France
.
5.
Cundall
,
P. A.
,
1980
, “
UDEC—A Generalized Distinct Element Program for Modeling Jointed Rock
,”
Report No. PCAR-1-80, Contract DAJA37-79-C-0548
,
U.S. Army, European Research Office
,
London
.
6.
Fox
,
D. J.
,
Kana
,
D. D.
, and
Hsiung
,
S. M.
,
1998
, “
Influence of Interface Roughness on Dynamic Shear Behavior in Jointed Rock
,”
Int. J. Rock Mech. Min. Sci.
, Vol.
35
, No.
7
, pp.
932
940
. https://doi.org/10.1016/S0148-9062(98)00153-3
7.
Homand-Etienne
,
E.
,
Lefevre
,
T.
,
Belem
,
T.
, and
Souley
,
M.
,
1999
, “
Rock Joints Behavior Under Cyclic Shear Tests
,”
Proceedings of the 37th U.S. Symposium on Rock Mechanics
,
Vail, CO
, June 7–9,
1999
, pp.
399
406
.
8.
Hsiung
,
S. M.
,
Ghosh
,
A.
,
Chowdhury
,
A. H.
, and
Ahola
,
M. P.
,
2004
,
Evaluation of Rock Joint Models and Computer Code UDEC Against Experimental Results, NUREG/CR-6216
, 3rd ed.,
U.S. Nuclear Regulatory Commission
,
Washington, D.C.
9.
Hutson
,
R. W.
and
Dowding
,
C. H.
,
1990
, “
Joint Asperity Degradation during Cyclic Shear
,”
Int. J. Rock Mech. Min. Sci. Geomech. Abstr.
, Vol.
27
, No.
2
, pp.
109
119
. https://doi.org/10.1016/0148-9062(90)94859-R
10.
Itasca Consulting Group, Inc.
,
2011
,
Universal Distinct Element Code, Version 5.0
,
Itasca Consulting Group
,
Minneapolis, MN
.
11.
Itasca Consulting Group, Inc.
,
2013
,
Three-Dimensional Distinct Element Code, Version 5.0
,
Itasca Consulting Group
,
Minneapolis, MN
.
12.
Jing
,
L.
,
1990
, “
Numerical Modelling of Jointed Rock Masses by Distinct Element Method for Two and Three-dimensional Problems
,” Ph.D. thesis,
Lulea University of Technology
, Lulea, Sweden.
13.
Jing
,
L.
,
Stephansson
,
O.
, and
Nordlund
,
E.
,
1993
, “
Study of Rock Joints Under Cyclic Loading Conditions
,”
Rock Mech. Rock Eng.
, Vol.
26
, No.
3
, pp.
215
232
. https://doi.org/10.1007/BF01040116
14.
Keefer
,
D. K.
,
1984
, “
Landslides Caused by Earthquakes
,”
Bull. Geol. Soc. Am.
, Vol.
95
, pp.
406
421
. https://doi.org/10.1130/0016-7606(1984)95<406:LCBE>2.0.CO;2
15.
Kishida
,
K.
,
Sakurai
,
Y.
,
Nakashima
,
S.
, and
Adachi
,
T.
,
2002
, “
Modeling of the Shear Behavior of Natural Rock Joints in Consideration of Powder Generated by the Shear Process
,”
ISRM International Symposium EUROCK
,
Madeira, Portugal
, Nov 25–27,
2002
, pp.
737
744
.
16.
Talesnick
,
M. L.
,
2007
, “
Determination of Shear Interface Parameters between Rock Blocks for Centrifuge Modeling
,”
Rock Mech. Rock Eng.
, Vol.
40
, No.
4
, pp.
405
418
. https://doi.org/10.1007/s00603-006-0118-3
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