Engineering Rock Mechanics
388 Design and analysis of underground excavations ttt Pillar characteristic (determined by uniaxial loading under plane strain) ...
Design against stress-controlled instability 389 of zero at a strain of 0.0116, which is equivalent to a displacement of about 7 ...
390 Design and analysis OF underground excavations dimensional geometries. This is elegantly demonstrated by the stress distribu ...
Design against stress controlled instabiliv 391 Effect of intersection & 5r 4 I I I Effect of the end of a circular tunnel 7 ...
392 Design and analysis of underground excavations sis. Moreover, there are also codes available for three-dimensional analysis ...
References Abramovitch M. and Stegun I. A. (eds) (1965) Handbook of Mathematical Functions. Dover, New York. Almenara J. R. (199 ...
394 References Creech T. (1683) Titus Lucretius Cams-Six Books of Epicurean Philosophy. Printed by Thomas Sawbridge at the Three ...
Rekrences 395 Hoek E., Wood D. and Shah S. (1992) Modified Hoek-Brown failure criterion for jointed rock masses. Proc. ISM Sympo ...
396 Uekrences Matheson G. D. (1983a) Rock Stability Assessment in Prelimina y lnvestigutions- Graphical Methods. Department of t ...
References 397 Tamai A. (1990) Internal Report, Imperial College, 85pp. Terzaghi K. (1963) Theoretical Soil Mechanics. John Wile ...
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Appendix A: Stress and strain a nu I ys is Stress analysis We do not talk about 'internal forces' when we are dealing with solid ...
400 Appendix A: Stress and strain analysis Nota tion Stress is a property that needs three values to fully describe it in the tw ...
Stress analysis 401 Remember the notation: normal stress, 7 x,---- acting on a plane normal to the x-axis shear stresses, acting ...
402 Appendix A: Stress and strain analysis az ao az, ax ay az -+-+-+y=o the equilibrium equations. Each equation contains increm ...
Stress analysis 403 If the global stresses are what are the local stresses? TSY, oy, 0. Ox’ 0 Ty’x’ 0 0,. “1 If we think in term ...
404 Appendix A: Stress and strain analysis Cancelling the S2 term, and remembering that zq = ryx, then ax! = a, cos2 e + a,, sin ...
Stress unalysis 405 Example X e = 300 3 sin e = 0.500, COS e = 0.866 :. of = 20 x (0.866)2 + 10 x (0.500)' +2 x 10 x 0.500 x 0.8 ...
406 Appendix A: Stress and strain analysis The principal directions are the directions of the co-ordinate axes such that for any ...
Stress analysis 407 Note: the largest of these stresses is the major principal stress, q. The smallest is the minor principal st ...
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