Journal ArticleDOI
Strength of a Model of Jointed Rock
Edwin T. Brown,D. Hugh Trollope +1 more
TLDR
In this paper, triaxial compression tests were carried out on idealized samples containing sets of preformed discontinuities inclined at various angles to the sample axes, and four major modes of failure were: axial cleavage fractures at low confining pressures, shear failure through the plaster and across joint planes, slip on joint planes and ductile failure.Abstract:
In an attempt to extend the presently limited state of knowledge of the strength of jointed rock masses, triaxial compression tests were carried out on idealized samples containing sets of preformed discontinuities inclined at various angles to the sample axes The 4 in by 4 in by 8 in samples were built up from one in cubes of a high strength gypsum plaster Triaxial tests were carried out on 5 sample types at each of 5 confining pressures in the range of 0 to 2000 psi The four major modes of failure were: (1) axial cleavage fractures at low confining pressures, (2) shear failure through the plaster and across joint planes, (3) slip on joint planes, and (4) ductile failure The strengths of block-jointed samples failing by mode (2) were less than those of the corresponding unjointed samples At the higher confining pressures of mode (4), the strengths were higher than those of the unjointed samples and were unaffected by joint orientation Friction parameters determined from tests in which mode (3) applied were the same as those determined for the plaster in direct shear tests Mohr's circle envelopes were curved, and could be described by a power law in which the normal stress index varied with joint orientationread more
Citations
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Journal ArticleDOI
Physical model test and numerical analysis on the behavior of stratified rock masses during underground excavation
Journal ArticleDOI
Fracture mechanisms of offset rock joints-A laboratory investigation
Omer Mughieda,A. K. Alzo’ubi +1 more
TL;DR: In this article, a series of uniaxial compression tests were performed on specimens made of rock-like material, made of 72% silica sand, 16% cement (Type I) and 12% water by weight.
Large scale slope stability in open pit mining : a review
TL;DR: Design of open pit slope angles is becoming more and more important as the mining depths of open pits continuously increase, and small changes in the overall pit slope angle have large consequences on mining productivity.
Journal ArticleDOI
Strength and deformation characteristics of jointed media in true triaxial compression
TL;DR: In this paper, the strength and deformation characteristics of jointed rocks under truly triaxial states of stress were investigated on an idealized model of a jointed rock in a specially designed loading arrangement.
Journal ArticleDOI
Fatigue failure characteristics of some models of jointed rock
E. T. Brown,J. A. Hudson +1 more