Rock Mass Classifications and Properties - CED Engineering

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Rock mass properties Table 2: Field estimates of uniaxial compressive strength. Grade* Term R6 Extremely Strong R5 Very strong R4 Strong R3 Medium strong R2 Weak R1 Very weak Uniaxial Comp. Strength (MPa) > 250 100 - 250 Point Load Index (MPa) Field estimate of strength >10 Specimen can only be chipped with a geological hammer 4 - 10 Specimen requires many blows of a geological hammer to fracture it 50 - 100 2 - 4 Specimen requires more than one blow of a geological hammer to fracture it 25 - 50 1 - 2 Cannot be scraped or peeled with a pocket knife, specimen can be fractured with a single blow from a geological hammer 5 - 25 ** Can be peeled with a pocket knife with difficulty, shallow indentation made by firm blow with point of a geological hammer 1 - 5 ** Crumbles under firm blows with point of a geological hammer, can be peeled by a pocket knife 6 Examples Fresh basalt, chert, diabase, gneiss, granite, quartzite Amphibolite, sandstone, basalt, gabbro, gneiss, granodiorite, limestone, marble, rhyolite, tuff Limestone, marble, phyllite, sandstone, schist, shale Claystone, coal, concrete, schist, shale, siltstone Chalk, rocksalt, potash Highly weathered or altered rock R0 Extremely weak 0.25 - 1 ** Indented by thumbnail Stiff fault gouge * Grade according to Brown (1981). ** Point load tests on rocks with a uniaxial compressive strength below 25 MPa are likely to yield highly ambiguous results.
Rock mass properties Table 3: Values of the constant mi for intact rock, by rock group. Note that values in parenthesis are estimates. 7
Page 1: Rock Engineering: Rock Mass Classif
Page 4 and 5: Rock mass classification Introducti
Page 6 and 7: Classifications involving stand-up
Page 8 and 9: Rock mass classification Deere's RQ
Page 10 and 11: Rock mass classification For exampl
Page 12 and 13: Rock mass classification Table 4: R
Page 14 and 15: Rock mass classification Table 5: G
Page 16 and 17: Rock mass classification Where no r
Page 18 and 19: Rock mass classification Table 6: C
Page 20 and 21: Rock mass classification Table 6: (
Page 22 and 23: Rock mass classification Based upon
Page 24 and 25: Rock mass classification Figure 4:
Page 26 and 27: Rock mass classification Grimstad,
Page 28 and 29: Rock mass properties Normal and she
Page 30 and 31: Rock mass properties Laboratory tes
Page 34 and 35: Rock mass properties Anisotropic an
Page 36 and 37: Uniaxial compressive strength of sp
Page 38 and 39: Rock mass properties conditions. Th
Page 40 and 41: Rock mass properties Table 6: Estim
Page 42 and 43: and Rock mass properties ⎛ GSI
Page 44 and 45: Mohr-Coulomb parameters Rock mass p
Page 46 and 47: Rock mass properties However, there
Page 48 and 49: Rock mass properties Similar studie
Page 50 and 51: Rock mass properties Table 8: Guide
Page 52 and 53: Stress 70 60 50 40 30 20 10 Rock ma
Page 54 and 55: Rock mass properties In the author
Page 56 and 57: Probability Probability 2.500 2.000
Page 58 and 59: Rock mass properties Figure 16: Dev
Page 60 and 61: Conclusions Rock mass properties Th
Page 62 and 63: Massive strong rock masses Rock mas
Page 64 and 65: Rock mass properties Figure 23: Iso
Page 66 and 67: Rock mass properties The only effec
Page 68 and 69: Rock mass properties Figure 28: App
Page 70 and 71: Failure zone with no support 8 MPa
Page 72 and 73: References Rock mass properties Bal
Page 74 and 75: Shear strength of discontinuities I
Page 76 and 77: Shear strength of rock discontinuit
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Uniaxial compressive strength - MPa
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Shear strength of rock discontinuit
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Shear strength of rock discontinuit
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Dr. Evert Hoek: Experience and Expe
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Rock Mass Classifications and Properties - CED Engineering

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