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Published in:
13-10-2015 | Technical Note
Modeling Roughness of Rock Discontinuity Surfaces: A Signal Analysis Approach
Published in: Rock Mechanics and Rock Engineering | Issue 7/2016
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Excerpt
Barton’s (1973) model for estimating the peak shear strength of rock discontinuity surfaces includes an input variable, called joint roughness coefficient (JRC). Using this model, Barton and Choubey (1977) empirically determined the JRC values of a large number of discontinuities and designated a set of ten roughness profiles (Fig. 1) that represents the JRC range of 0–20. These ten profiles continue to function as a practical tool for visually matching and assigning corresponding JRC values to discontinuity surfaces.
Table 1
PRI 10 values calculated for each standard JRC profile sampled at four different intervals
|
Profile
|
Sampling interval (mm)
|
|||
|---|---|---|---|---|
|
0.1
|
0.5
|
1.0
|
2.0
|
|
|
1
|
0.0266
|
0.0287
|
0.0287
|
0.0263
|
|
2
|
0.0437
|
0.0438
|
0.0433
|
0.0478
|
|
3
|
0.0635
|
0.0636
|
0.0640
|
0.0695
|
|
4
|
0.0948
|
0.0944
|
0.0918
|
0.0911
|
|
5
|
0.0990
|
0.0982
|
0.1004
|
0.0988
|
|
6
|
0.1051
|
0.1050
|
0.1075
|
0.1139
|
|
7
|
0.1262
|
0.1266
|
0.1317
|
0.1308
|
|
8
|
0.1488
|
0.1488
|
0.1453
|
0.1510
|
|
9
|
0.1650
|
0.1650
|
0.1621
|
0.1748
|
|
10
|
0.1919
|
0.1881
|
0.1957
|
0.2078
|
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