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The influence of out-of-plane stress on a plane strain problem in rock mechanics

✍ Scribed by M. B. Reed

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
382 KB
Volume
12
Category
Article
ISSN
0363-9061

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✦ Synopsis

This paper considers the excavation of a cylindrical cavity in a uniformly prestressed mass of brittle Mohr-Coulomb rock. Previous plane strain displacement solutions have assumed that the out-of-plane stress remains the intermediate principal stress at all points. It is here shown that when this assumption breaks down, an inner plastic zone is created in which cr, < cr, = cr@ A displacement solution is given for this case, using a variable-dilation plastic flow rule, and results are compared with the previous solution for specific problems. A significant difference is observed only for problems involving a large drop in strength upon yield.

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