Engineering Rock Mechanics
148 Rock masses of the total failure behaviour of a rock mass: this is because of the presence of the discontinuities and the ma ...
9 Permeability The subject of permeability is concerned with fluid flow through a material, or rocks and rock masses in our curr ...
150 Perrneabihfy q. =-A- ki. ap iu 'xj where qi is the specific discharge, is the pressure gradient causing flow, is the fluid v ...
Primary and secondary permeability 1 5 1 KdP 4=--. The term, K, is the coefficient of permeability (or hydraulic conductivity) w ...
152 Permeabi/i?, -Shale- -Limestone & Dolomite- -Volcanics -Metamorphics- +Salt- -Granitics- -Clay -Sandstone- Gravel Sands ...
Flow through discontinuities 153 Pressure Q = 2-D flow quantity per unit time (m2/sec) xpl Aperture Arbitrary datum level Flow i ...
9.4 Flow through discontinuity networks Often, in discontinuity arrays, one discontinuity will terminate against another and it ...
Flow through discontinuity networks 155 A R 21.5m I25m I G-2 VE 111 VI1 5 5 Pch,.PdY, 0 0 5 L 25 25 18 10 30 10 0 H 30 30 Hc H, ...
156 Permeability 9.5 Scale effect There are no length dimensions in Fig. 9.7: the discontinuity array could represent small frac ...
Scale effect 157 Whole pattern El Connected part of pattern 623 Figure 9.8 The scale effect illustrated through computer simulat ...
1 58 Permeability volume increases, so the measured values become more representative. This leads automatically to the concept o ...
A note on efktive stresses 159 excavation as different discontinuities are traversed. We would predict that for almost all rock ...
160 Permeabiliv Figure 9.10 Effective stresses for intact rock and discontinuities. water pressure of u is introduced, all norma ...
Some practical aspects: grouting and blasting 1 6 1 which subsequently blocks the flow paths through the rock mass. Luckily, dur ...
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Anisotropy and 70 inhomogeneity We have already emphasized the natural history of the rock material which is being used for engi ...
164 Anisotropy and inhomogeneity Thus, the type of anisotropy and/or inhomogeneity variation could be gradual within the intact ...
Anisotropy 165 Continuous fracture Discontinuities i i Inhomogeneous -64 -32 *96 Anisotropic: 9+65 83 u+ Non-elastic Discontinuo ...
166 Anisotropy and inhomogeneity in a specific horizontal direction. We also noted that properties such as the rock mass deforma ...
Inhomogeneity 167 p=75 *=. Confining pressure g3 MPa ? A Legend 1.7 A (^0) A 2.7 3.6 A0 + ' 5.2 6.0 7.0 r 8.0 0 Lower bound tre ...
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