Engineering Rock Mechanics
342 Underground excavation instability mechanisms Figure 19.4 Pilot tunnel with steel arch support “I * Figure 19.5 Inflow of to ...
Questions and answers: underground excavation instability mechanisms^343 can be used for tunnel support but not for TBM excavati ...
344 Underground excavation instability mechanisms A19.1 To solve this question we use hemispherical projection tech- niques (see ...
Questions and answers: underground excavation instability mechanisms 345 Block 123 Block 124 Block 125 Block 134 Block 135 Block ...
346 Underground excavation instability mechanisms Block 234 Block 245 Block 235 Block 345 419.2 For the unstable roof blocks est ...
Questions and answers: underground excavation instability mechanisms 347 Intersection Orientation Intersection Orientation Inter ...
348 Underground excavation instability mechanisms using the dotted intersection lines on the projection to determine their trend ...
Questions and answers: underground excavation instability mechanisms 349 Af = $($1121 sin8121 + $2151 sin8251 + $5111 ~in0~~1) = ...
350 Underground excavation instobilify rnechonisrns h = $14 tan814 + 145 tan845 + 151 tan8511 = i(6. tan 27 + 75 e tan 2 + 3. ta ...
Questions and answers: underground excavation instabilify mechanisms^35 1 h = 5 (123 tan 823 + 123 tan 835 + 152 tan 852) = = i( ...
352 Underground excavation insfabilify mechanisms W = $yAjh = f x 22 x 11.42 x 0.77 = 64.5 kN, and p = (^1) 3y h = 5 x 22 x 0.77 ...
Questions and answers: underground excavation instability mechanisms 353 Block 125 Block 134 Block 135 Block 145 Block 234 Block ...
354 Underground excavation instability mechanisms Block 245 Block 345 Block Stability condition Direction 123 falls 124 125 355/ ...
Questions and answers: underground excavofion instability mechanisms 355 Block 123 Block^124 Block 125 Block^134 Block 135 Block ...
356 Underground excavation instability mechanisms Block 234 Block^235 Block 245 Block 345 Block Stability condition Direction 12 ...
Questions and answers: underground excavation instability mechanisms 357 the direction 335/64). We are told that the strength of ...
358 Underground excavation instability mechanisms 419.7 At a depth of 450 m, a 3-m diameter circular tunnel is driven in rock ha ...
Questions and answers: underground excavation instability mechanisms 359 distance of the 5% zone of influence for the hydrostati ...
360 Underground excavation instability mechanisms The discretization of the problem is shown below. We have taken advantage of v ...
Questions and answers: underground excavation instability mechanisms 361 40 35 a a^30 vi cn^25 0 U U^3 g 20 8 15 s 10 5 0 -5 80 ...
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