Engineering Rock Mechanics

202 Rock mass classification such as a bedding plane, the description that best fits this is ’rough or irregular, planar’, and h ...

Questions and answers: rock mass classification 203 Poorrock Shotcrete applied to a thickness of 2.5 cm to 7.5 cm, or untensione ...

204 Rock mass classification value for both Q and RMR, which means that only a single point is plotted. This plot shows that the ...

Questions and answers: rock mass classification 205 line, then RMR = 9111 Q + 44 is the most well known line, although RMR = 5.9 ...

206 Rock mass classification ers that we consider essential. However, there is the disadvantage that u priori assignments of rat ...

Questions and answers: rock mass classification 207 The next step is to establish whether an increase in each of these seven par ...

208 Rock mass classification The fractures within each rock mass type have the properties shown in the following table: Persiste ...

Questions and answers: rock mass classification 209 Persistence Aperture Roughness Infilling Weathering Total Sandstone 5-8 (2) ...

15 12 ._ I? E9 c 5 g6 v) 0) C 3 0 of the routes one can walk through a city that is built on a rectangular grid. In the example ...

Questions and answers: rock mass classification^2 1 1 comment on the inhomogeneity of the rock mass in terms of (i) fracture fre ...

2 12 Rock mass classification value of RQD threshold is 2 2 3.861 3.861 - 1.143 In (1.143) = 0.90m. t* = hmax - hmin The new val ...

Additional points 2 1 3 can be written in the form SMR = RMR- Fg + Fe, where Fg is a factor representing the geometry of the pot ...

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Rock dynamics and 73 time dependency 13.1 Strain rates Rock behaviour mechanisms can occur at significantly different rates: dur ...

2 16 Rock dynamics and time dependency The distinction between 'quasi-static' and 'dynamic' shown in Fig. 13.1 is arbitrary, alt ...

Questions and answers: rock dynamics and time dependency 2 1 7 occurs when there is increasing strain during stress cycling. Whe ...

2 18 Rock dynamics and time dependency (b) Given that marble has a sufficiently high compressive strength to sustain the compres ...

Questions and answers: rock dynamics and time dependency 2 1 9 is stress/E = 200/6oooO = 0.0033. For a specimen 100 mm long, thi ...

220 Rock dynamics and time dependency 1.85 1 % c 1.75 - X E .", 1.70 - .- 1.65 - la' 7- instantaneous elastic strain 1.60 I 0 2 ...

Questions and answers: rock dynamics and time dependency 22 1 At t = 00 this reduces to and so the difference between the long-t ...