Stability, Failure, and Measurements of Boreholes and Other Circular Openings (1993) / Chapter Skim
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6 Conclusions
6 Conclusions
Pages 73-76
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From page 73... ...
Such situations can be created by involving nonlinear rock properties or strong coupling effects. Such mechanisms can also explain delayed instabilities without the loss of rock strength nor a decrease in support capacity.
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From page 74... ...
For example, axial splitting parallel to the direction of maximum principal stress seems to occur in stronger rocks only where curved shear fractures prevail in a weak formation However, these phenomenological observations are still obscure. Periodicity and localized failure are also documented more now that such patterns are known to exist to the extent that symmetrical failures have become an exception rather than the rule.
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From page 75... ...
At present, considerable research efforts are spent in investigating surface instabilities as well as 1 he influence of preexisting discontinuities on the overall stability of underground openings. Finally, substantial progress has been made in assessing the distress of the wall of the opening.
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