Engineering Rock Mechanics
108 Intact rock BASIC EQUATIONS Rock fails at a critical combination of normal and shear stresses: IT1 = To + pun z0 = cohesion ...
Failure criteria 109 6.5.2 The plane Griffith criterion The essence of the Griffith criterion is that for a material to break in ...
1 10 lntoct rock a direct mechanical explanation of the size effect discussed earlier: the tensile strength decreases with incre ...
Concluding remarks 11 1 rz = 0.87 5.0 - . 4.0 .... . .. r/ . . II I I I I I I n 0.2 0.4 0.6 0.8 I .o 1.2 2 cc Figure 6.20 The Ho ...
112 Intactrock luihors rlurrell(1963) 'airhunt (1964) {obbs (1966) Franklin (1971) Bienlawski (1974) Yoshinaka & Yamabe (198 ...
7 Discontinuities It is the existence of discontinuities in a rock mass that makes rock mechanics a unique subject. The word 'di ...
1 14 Discontinuities 7.1 The occurrence of discontinuities In Fig. 7.1, we illustrate just two examples of discontinuous rock ma ...
The occurrence of discontinuities 1 15 that very often major discontinuities delineate blocks within the rock mass, and within t ...
1 16 Discontinuities is an essentially one-dimensional sample through the three-dimensional rock mass, with obvious limitations. ...
Geometrical properties of discontinuities 1 1^7 plane, incorporating factors such as the shape of the bounded plane and the asso ...
1 18 Discontinuities Figure 7.4 Quantifying discontinuity occurrence along a sampling line. between fractures, denoted by xi in ...
Geometrical properties OF discontinuities 1 1 9 Frequency Of occurrence f(X: Discrete Fc. Spacing, x Continuous I- I I , x= I, S ...
1 20 Discontinuities A Probability Figure 7.6 The contribution to the core length made by intact pieces of rock greater than 0.1 ...
Geometrical properties of discontinuities 1 2 1 Note that by using the negative exponential distribution in this way, the RQD* c ...
1 22 Discontinuities r i / d In Fig. 7.8, a sampling line intersects the traces of one idealized set of discontinuities: this ma ...
Geometrical properties of discontinuities 1 23 and minimum discontinuity frequency are perpendicular for the case of one set: th ...
1 24 Discontinuities Discontinuity set I parallel to plane BCD Number "2 "3 " " '. .' " " of SetS N : 1 Discontinuity 2 4 "4 " ' ...
Geometrical properties of discontinuities M M 125 Figure 7.11 Variation in discontinuity frequency for a sampling line passing t ...
1 26 Discontinuities two-dimensional piece of paper. There are many possible techniques for this. In fact, the problem of plotti ...
Geometrical properties of discontinuities 1 27 statistical or fuzzy-set methods (Harrison, 1993). In Fig. 7.13, we show an examp ...
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