Engineering Rock Mechanics
362 Underground excavation instability mechanisms For the left-hand tunnel and point A, the parameters required for the Kirsch s ...
Questions and answers: underground excavation instability mechanisms 363 a m I 6 1500 ~ (^4) = cn E" 1000 1 D F included in each ...
364 Underground excavation instability mechanisms I/) a, m -0 (^6) m m 8.0 1 numerical analysis Kirsch approximation ...
Questions and answers: underground excavation instabiliiy mechanisms 365 situ case can be computed using and so for the roof we ...
366 Underground excavation instability mechanisms 140 - 120 - 100 - z- 80 ~ .E 60 ~ ' I 40- P m 20 ~ a V 0, 0- -20 ~ -40 side ...
Questions and answers: underground excavation instability mechanisms 367 inclination of the long axis to the horizontal, and x i ...
368 Underground excavation instability mechanisms Thus, we see that the first of these angles represents the location where the ...
Additional points 369 here, the water is flowing horizontally across the page as this is the direction of the major principal st ...
370 Underground excavation instability mechanisms .. Plan view of shaft and instable block I' ' 4 N W -3 E -2 -1 1 indicates tha ...
Additional points 37 1 Computer programs are available for many rock mechanics purposes including the analysis of rock mass geom ...
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Design of 20 underground excavations 20.1 The project objective The purpose of the engineered structure will influence its desig ...
374 Design of underground excavations Figure 20.2 Interaction of high stresses and rock mass fractures has combined to cause fai ...
Question and answers: design of underground excavations 375 20.2 Question and answers: design of underground excavations 420.1 A ...
376 Design of underground excavations (c) Square shaft induced around a square opening is not available, because of the disconti ...
Question and answers: design of underground excavations 377 fracture problems, the choice of a west-east orientation should defi ...
37% Design of underground excavations Compute the water pressure required to open the critical fracture Using these results, pre ...
Question and answers: design of underground excavations 379 and the angle to the normal to set 3 is 130n - (155" - 90") = 65", r ...
380 Design of underground excavations proaches the maximum allowable, it will induce shearing immediately below the horizon and ...
Question and answers: design of underground excavations 381 3.50 -. Proof = Pi + (re - r)Yrock Pfloor = Pi - (re - r)l'rock. We ...
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