Stability of Asymmetric Roof Wedge Under Non-Symmetric Loading |
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| Authors: | P P Nomikos P V Yiouta-Mitra A I Sofianos |
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| Institution: | (1) Division of Mining Engineering, National Technical University of Athens, School of Mining and Metallurgy, Athens, Greece |
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| Abstract: | Summary. An analytical method is presented for the calculation of the load carrying capacity of two-dimensional asymmetric rock wedges
when the loading on the joint faces is non symmetric, such as the case of an asymmetric wedge formed in the roof of a circular
tunnel in an inclined stress field. The pull out force that causes yield at one of the joint faces is evaluated from formulae
based on the limiting equilibrium conditions assuming a purely frictional joint resistance. Next, the total pull out force
required for the secondary face to yield is calculated. During this step, the wedge is further displaced and while the primary
yielding face is plastically deformed, the other face is still in the elastic range until failure. Validation of the analytical
procedure is obtained with the UDEC code, which provides an implementation of the Distinct Element Method in two dimensions.
When the assumptions made in the analytical procedure are valid, the analytically calculated values for the pull out resistance
of the wedge are computed to be close to the numerically obtained ones. |
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| Keywords: | : Rock wedges limit equilibrium numerical simulation |
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