Engineering Rock Mechanics
368 Design and analysis of underground excavations Sliding A = area of sliding surface = Coulomb strength parameters ‘1 9 CA + ( ...
Design against sfrucfura//y-contro//ed instabilify 369 Under the circumstances of a compressive rock stress, it is noted in the ...
370 Design and analysis of underground excavations Taking into account both the two components aI and a2 of the apical angle, th ...
Design against structurally-controlled instabilijl 37 1 Block falling from roof B OAB = plane 1, OBC = plane 2, OCA = plane 3 AB ...
372 spaces may be studied concurrently. A 'spherical projection' is shown in Fig. 20.14, with the extensions of the great and sm ...
Design against structurally-controlled instability 373 Figure 20.15 Illustration of rock blocks formed by the intersection of ro ...
374 Design and analysis of underground excavations shown in this diagram, and are mathematically defined as U1 n L2 = JP U, n U, ...
Design against stress-controlled instability 375 where qinduced represents any component of induced stress, and the number 0.05 ...
376 Design and analysis of underground excavations tP Figure 20.17 Elliptical approximation to the 5% zone of influence from the ...
Design against stress-controlled instability 377 the other, as in Fig. 20.19. The zone of influence (in this case 5%) associated ...
378 Design and analysis of underground excavations complex set of caverns and tunnels, so that these considerations become incre ...
Design against stress-controlled instability 379 in this figure and that shown in Fig. 20.17 is clear, except that now we are co ...
380 Design and analysis of underground excavafions WIH=2 k=0.5 WIH=2 k=0.1 Figure 20.22 Illustration of the variation in the 5% ...
Design against stress-controlled instability 38 1 W =3,p --,pg=m H H A- 2 Ovaloid cA)-A -0.5~ c BEM 3.60~ ttt uA = pllt ...
382 Design and analysis of underground excavations When these values are compared to those in Fig. 20.24 determined from a bound ...
Design against stress-controlled instability 383 high compressive radial stress induced beneath the bolt head (theoretically, th ...
384 Design and analysis of underground excavations The design objective is to study the form of the ground response curve for an ...
Design against stress-controlled instability 385 Following this procedure allows the production of three ground response curves ...
386 Design and analysis of underground excavations Figure 20.28 shows a wide range of principles associated with the ground resp ...
Design against stress-controlled instab;/;?/ 387 response curve and the available support line, such that practical support pres ...
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