CALCULATING ELASTO-PLASTIC PROBLEM OF ELLIPTICAL TUNNEL WITH PERTURBATION METHODS
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Graphical Abstract
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Abstract
This paper calculates the elasto-plastic problem of elliptical tunnelwith perturbation methods. It is supposed that material is ideally elasto-plastic according with Coulomb yielding critcrion and an annular region around tunnel has entered plastic yield. This paper gives analytical expressions of the stress, and elasco-plastic interface when second step small amount is concerned. In last examples, mechanical characteristic of the plastic region form and tunnel form isdiscusscd ualitatively and quantitatively.
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