Engineering Rock Mechanics

82 lnfad rock: deformabili% strength and failure A Shearstress,r Effect of intermediate principal stress magnitude is in the Hoe ...

Questions and answers: intact rock 83 but the Hoek-Brown criterion is for strength (i.e. a structure breakdown criterion), where ...

84 lnfad rock: deformabi/i% strength and failure Hoek-Brown criterion We can either simply take appropriate values for the param ...

Questions and answers: intact rock 85 46.9 In 1926, in a paper on tensile tests for cotton yarns (Pierce, 19264), Pierce stated, ...

86 lntod rock: deformabili?., strength and failure Whole specimen volume is critically stressed Only a small part of the specime ...

Additional points 87 Panel A Panel B 6.3 Additional points Although a failure criterion based on the physical mechanisms of fail ...

88 lntod rock: deformobilify, strength ond failure The empirical Hoek-Brown criterion has become the most widely used failure cr ...

Fractures and hemispherical projection 7 7.1 Natural, pre-existing fractures During its geological history a rock mass has been ...

90 Fractures and hemispherical projection terization, as illustrated by the examples in Fig. 7.2, showing quarry faces and assoc ...

Natural, pre-existing fractures 91 Figure 7.2 (b) The Mountsorrel granodiorite, Leicestershire, UK, with complex fractur- ing. N ...

92 Fractures and hemispherical projection This array is not / , repmentanactual \\-* ” but to illustrate’ .. principles of all T ...

Natural, pre-existing fradures 93 35- e 30 8 * 25 x p 20- s ' 15- 10- 5- 0 -^26 15 5 -- 345670 Number of sides of polygon Figu ...

94 Fractures and hemispherical projection 6- O 5- 1 3- p 4- 2- 1- oi 91 0.0-1.0 1.0-2.0 2.0-3.0 3.0-4.0 Length, x + Frbability d ...

Natural, pre-existing fractures 95 , Approximately linear^6 < d <^16 e b g 50. I I % I 0 10 20 30 40 Frequency, d rn-l Fig ...

96 Fractures and hemispherical projection Se Figure 7.7 Important fracture characteristics for engineering rock mechanics. One o ...

Natural, pre-existing fractures 97 Figure 7.8 Longer fractures are more likely to be intersected by a scanline, borehole or unde ...

98 Fractures and hemispherical projection stage of the solution of the example question. When using the hemi- spherical projecti ...

Natural, pre-existing fractures 99 Finally, rotate the tracing paper back to north, measure the dip dir- ection of the plane and ...

1 00 Fractures and hemispherical projection N 017/76 Finally, rotate the tracing paper back to N, and read off the trend of the ...

Questions and answers: fractures and hemispherical projection 101 (b) How many pieces of core could be expected to have a length ...