Engineering Rock Mechanics
2 62 Excavation principles by improved cutter technology or by combining the explosive and cutting/mucking processes in the mach ...
Additional points 263 span generally decreases with depth from 10-30 m spans in the 50-400 m depth range, reducing to 10-20 m sp ...
...
Rock reinforcement 76 and rock support 1 tL1 The stabilization system When an excavation is made in a rock mass, there may be a ...
266 Rock reinforcement and rock support Figure 16.1 Workers awaiting the breakthrough of the south seaward running tunnel TBM in ...
Questions and answers: rock reinforcement and rock support 267 of allowing the rock mass to deform in order to reduce the suppor ...
268 Rock reinforcement and rock support terms of the angle, fl, at which the bolt is installed relative to the plane, the angle ...
Questions and answers: rock reinforcement and rock support 269 (a) The component of the bolt force acting parallel to the slope ...
2 70 Rock reinforcement and rock support 1.06 - 1.04 - 5 1.02 - 9 g 1.00 - 2 u- 0 0 0.98 - 0.96 - 0.94 If we consider T cos p to ...
Questions and answers: rock reinforcement and rock support^271 and so untensioned bolts only provide restraint. As such, we cons ...
272 Rock reinforcement and rock support working capacity of each bolt, T, is 150 kN, what area of the roof will each bolt suppor ...
Questions and answers: rock reinforcement and rock support^273 (a) Assuming the friction angle of the fractures, &, is 509 u ...
2 74 Rock reinforcement and rock support Stress is parallel to the , Region where interlayer slip can occur cannot occur F In th ...
Questions and answers: rock reinforcement and rock support 275 +^2 r/R Show that the same result for the zone of distress at the ...
2 76 Rock reinforcement and rock support DEE These zones coincide with those determined by Daemen, also shown in the diagram. Th ...
Questions and answers: rock reinforcement and rock support 277 support pressure, it is in theory possible to apply support press ...
2 78 Rock reinforcement and rock support at a radial stress of 20 MPa, the other is the elastic displacement induced when the ra ...
Questions and answers: rock reinforcement and rock support 2 79 25r-- - -/ -- __ operating point: u=5.9mm, p7.3MPa .- __ I 0 2 4 ...
280 Rock reinforcement and rock support If we use the usual geomechanics convention of compressive stresses and contractile stra ...
Additional points 281 From this we find that the area of steel bars required per square metre of pillar face is 11.3/210 = 0.054 ...
«
10
11
12
13
14
15
16
17
18
19
»
Free download pdf