16. E. Hoek and E. T. Brown (1980) introduced the empirical criterion of failure for rocks: 01.p qu where m and s are constants; = qu 1/2 - (m 0 ³ + s)' qu rock mass qu rock substance/ (a) Compare this with Equation 3.15 for the case m = 0 and s = 1. (b) Hoek and Brown, in studying many sets of data, found the following approximate values: m = 7 for carbonate rocks, m = 10 for argillaceous rocks, m= 15 for sandstone and quartzite, m = 17 for volcanic rocks, and m = 25 for granitic and other intrusive rocks. Compare the peak compressive strengths as a function of confining pressure for a marble, a rhyolite, and a granite, all having qu = 100 MPa. What is the physical meaning of parameter m?
16. E. Hoek and E. T. Brown (1980) introduced the empirical criterion of failure for rocks: 01.p qu where m and s are constants; = qu 1/2 - (m 0 ³ + s)' qu rock mass qu rock substance/ (a) Compare this with Equation 3.15 for the case m = 0 and s = 1. (b) Hoek and Brown, in studying many sets of data, found the following approximate values: m = 7 for carbonate rocks, m = 10 for argillaceous rocks, m= 15 for sandstone and quartzite, m = 17 for volcanic rocks, and m = 25 for granitic and other intrusive rocks. Compare the peak compressive strengths as a function of confining pressure for a marble, a rhyolite, and a granite, all having qu = 100 MPa. What is the physical meaning of parameter m?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Exercises at the end of the third chapter of Goodman's book Introduction to Rock Mechanics
Transcribed Image Text:σ 1,2
(3.15)
qu
The constants N and M will be determined by fitting a curve to the family of
points
=1
σy
qu
*
1.p
qu
Transcribed Image Text:16. E. Hoek and E. T. Brown (1980) introduced the empirical criterion of
failure for rocks:
01.p = + (m
qu
qu
where m and s are constants;
1/2
2011 + s)¹²
qu rock mass
S= qu rock substance/
(a) Compare this with Equation 3.15 for the case m = 0 and s = 1.
(b) Hoek and Brown, in studying many sets of data, found the following
approximate values: m = 7 for carbonate rocks, m = 10 for argillaceous
rocks, m 15 for sandstone and quartzite, m = 17 for volcanic rocks,
and m = 25 for granitic and other intrusive rocks. Compare the peak
compressive strengths as a function of confining pressure for a marble, a
rhyolite, and a granite, all having qu = 100 MPa. What is the physical
meaning of parameter m?
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