By Charles Fairhurst; John A Hudson
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The random block size could be reduced to give a more accurate representation of the strength, at the cost of computational efficiency, but is was felt that the block sizes chosen sufficed to capture the overall behavior of the pipe orebody when subjected to the VCR undercut and subsequent stope development during VCR blasting. e. vertical stress ( a. ) equal to the uniform horizontal stress ( ah ). ) to assess the influence of stress state on cavability of the ore. A vertical pressure corresponding to the weight of the overburden rock was applied to the upper horizontal boundary, with the vertical pressure on the pipe portion of this boundary reduced to account for the lower density of the waste rock in the mined-out pipe overlying the 700 m level.
IN I iNa lN I 3 I I C r i t ica l state ( D = l l \ 37 D = d i s tu r b a nce f u n c t ion ( 1 -D ) \_ C r i t i c a l state W = l l II;_D Schematic of the DSC concept: (a) dense material; (b) loose material. I20 is the second invariant of the deviatoric strain tensor and N denotes points on observed, intact and critical responses The critical state response is defined as the state at which no further volume change occurs under increasing shear and can be dependent upon factors such as initial confinement and stress path.
Bieniawski z. T. Prediction of rock mass behavior by the geomechanics classification. In Proc. 2nd Australia-New Zealand Conj. Geomechanics, Brisbane, pp. 36-41 (1975). Einstein A. Quoted in US Journal Newsweek, April 16, 1979. Goodman R. , Taylor R. L. and Brekke T. L. A model for the mechanics ofjointed rock. J. Soil Mech. Found. Div. Am. Soc. Civ. Eng. 94, 637 (1968). Crouch S. L. and Starfield A. M. Boundary Element Method in Solid Mechanics. George Allen and Unwin, London (1983). Berry D. S.
Analysis and design methods by Charles Fairhurst; John A Hudson
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