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40:. Two pieces of rock containing a discontinuity are held in hand or mounted in test equipment with the discontinuity horizontal. The sample is slowly tilted until the top block moves. The angle with the horizontal at onset of movement is called the
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The size of the specimen is limited to 10–20 cm for hand-held tests, while machine-operated tilt test equipment may handle up to meter-sized samples. In the field, the angle can be determined most easily with an
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do not break, and the walls of the discontinuity are completely fitting at the start of the test, while if the walls of the discontinuity are completely non-fitting, the
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Barton, N.R. (5–6 March 2008). "Shear
Strength of Rockfill, Interfaces and Rock Joints, and their Points of Contact in Rock Dump Design". In Fourie, A. (ed.).
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Phien-wej, N.; Shrestha, U.B.; Rantucci, G. (1990). "Effect of infill thickness on shear behaviour of rock joints". In Barton, N.R.; Stephansson, O. (eds.).
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Xian-Qin, H.; Cruden, D.M. (1992). "A portable tilting table for on-site tests of the friction angles of discontinuities in rock masses".
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represents a combination of the (apparent or real) cohesion and the friction along the discontinuity. If infill material is present, the
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87:) if no real cohesion is present (i.e. no cementing or gluing material between the two blocks), no infill material is present, the
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is governed partially or completely by the infill, depending on the thickness of the infill and height of asperities.
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equals the friction of the material of the discontinuity walls (
153:. London: Institute of Mining and Metallurgy. pp.
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291:Engineering Geology: Principles and Practice
289:Price, D.G. (2008). De Freitas, M.H. (ed.).
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68:equals the material friction of the
322:Tests in geotechnical laboratories
247:Australian Centre for Geomechanics
54:geological or structural compasses
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72:wall plus the roughness i-angle (
32:is a simple test to estimate the
213:), Rotterdam. pp. 289–294.
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147:Hoek, E.; Bray, J. (1974).
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150:Rock slope engineering
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241:. Perth, Australia:
211:Taylor & Francis
332:Tunnel construction
129:Triaxial shear test
52:as present in most
28:In geomechanics, a
192:10.1007/BF02595034
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304:978-3-540-29249-4
272:External link in
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249:. pp. 3–17.
220:978-90-6191-109-8
164:978-0-419-16010-6
124:Direct shear test
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50:inclinometer
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209:. Balkema (
207:Rock Joints
316:Categories
135:References
112:tilt-angle
108:tilt-angle
97:tilt-angle
93:tilt-angle
89:asperities
74:tilt-angle
66:tilt-angle
60:Tilt-angle
42:tilt-angle
30:tilt test
295:Springer
243:Nedlands
118:See also
22:fitting
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327:Rocks
299:ISBN
280:help
251:ISBN
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64:The
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101:φ
85:i
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