Engineering Rock Mechanics
288 Surkrce excavation instabiliiy mechanisms In Fig. 17.1(a), the failure surface has been created through the rock mass (behav ...
Slope instability 289 Figure 17.3 Photographs illustrating the four basic mechanisms of rock slope instability shown in Fig. 17. ...
290 Surface excavation instability mechanisms Isotropic material If the ground is reasonably isotropic, the surface tends to be ...
Slope instabiliv 291 number of unknowns. The usual method of doing this is by sub-dividing the mass under consideration into 'sl ...
292 Surkrce excavation instabiliv mechanisms sliding directly, and by making suitable assumptions to render the problem two dime ...
Slope instability 293 Variation with FoS = 1 0.8 0.6 0.4 0.2 ~ I I I I 1 I I 1 0 24 6 8 10 12 14 16 Depth of water in 15m ...
294 Surface excavation instability mechanisms Line of intersection I face Wedge / Direction of sliding Forces on wedge View perp ...
Slope instability 295 The various forces and angles used in these formulae are shown in the individual parts of Fig. 17.7. Conso ...
296 Surface excavation instability mechanisms 77.7.4 Toppling To complete the set of fundamental mechanical modes of structurall ...
S/ope instobilify 297 5 4 a Stable block $<+ b/h >tan $ Sliding & toppling b/h < tan 6 Toppling only IIIIII Base pl ...
298 Surface excavation instability mechanisms and the limiting lines at an angle of qbj on either side of this normal, is shown. ...
Foundation instability 299 Each element is Rock slope by discontinuities beyond its strength Gravitational loading occur on both ...
300 Surkrce excavation instability mechanisms Lower bound theorem. If any stress distribution throughout the struc- ture can be ...
Foundation instability 301 would be one of many upper bound solutions to the actual collapse load. The geometry of the assumed p ...
302 Surkrce excavation instability mechanisms 4 d B4 i i A i i 60" VIV to v3 c' =^25 kNh2 vi = 1.0 (arbitrary assumption) 4' = 2 ...
Foundation instability 303 foundations under high loads and where the rock mass is effectively con- tinuous and weak. Such circu ...
304 Surface excavation instability mechanisms Line load of P per unit length in y direction Line load of Q per unit length in y ...
Foundation instabilify 305 Figure 17.19 Contours of radial stress induced by line loading inclined at an arbitrary angle to the ...
306 SurFace excavation instability mechanisms approximate, because once an inter-layer slip failure criterion has been applied, ...
Foundation instabilij. 307 IP Figure 17.22 Radial stress contours produced using Bray's solution for an equiva- lent anisotropic ...
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