Application of Elasto-Plastic Analysis to Tunnelling
Some applications are presented of the elasto-plastic and visco-plastic stress analysis to tunnelling problems. First, the closed form solution is recalled of the so-called “characteristic line” of a circular opening, which is frequently adopted for a simplified evaluation of the load acting on the lining of deep tunnels. Subsequently, some examples are discussed, based on the finite element method, which illustrate a number of effects influencing the behaviour of underground openings. They concern, for instance, the mutual influence of parallel tunnels, the “squeezing” and the “strain softening” behaviour of the rock mass, the pore pressure changes induced by underground excavations in saturated media. The discussion is confined to static problems and to continuous rock/soil masses.
KeywordsRock Mass Shear Band Surface Settlement Strain Softening Tunnel Face
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