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- W2480959684 abstract "In engineering practice, the response of squeezing rock to tunnel excavation is usually analysed by assuming that the ground behaves as a linearly elastic, perfectly plastic material obeying the Mohr-Coulomb yield criterion (the “MC” model). The model has some limitations, especially if the ground is waterbearing: Due to the assumption of purely elastic behaviour before failure, the MC model cannot predict the excess pore pressure caused by pre-failure plastic deformations under undrained conditions. This deficiency may be significant considering that pore pressure effects are generally important for squeezing ground. In order to study the influence of this aspect of the material behaviour, we performed comparative computations concerning the short-term (undrained) behaviour of the ground in tunnelling, assuming two alternative elastoplastic, strain hardening models, the so-called Deviatoric Hardening model (“DH” model) and the Modified Hardening Soil model (“MHS” model). Both models are relatively simple, needing only common triaxial tests to identify their parameters, and they can simulate contractant plastic behaviour (and thus the pre-failure generation of positive excess pore pressure) and map the behaviour of weak rock in consolidated undrained triaxial compression tests more successfully than the MC model. Numerical analysis showed that the inclusion of the excess pore pressure in the two alternative models leads to larger and slightly more rapid displacements of the tunnel wall than under the MC model. According to the numerically determined stress field, an extended zone of the ground around the opening exhibits positive excess pore pressures, which also indicates the importance of contractant behaviour. However, the difference is not so dramatic with respect to displacements of the tunnel boundary. This shows that the widely-used MC model is adequate for the specific problem under consideration (estimation of the ground response to tunnel excavation), in spite of its simplifications." @default.
- W2480959684 created "2016-08-23" @default.
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- W2480959684 date "2014-09-04" @default.
- W2480959684 modified "2023-09-24" @default.
- W2480959684 title "The effect of constitutive modelling on estimates of the short-term response of squeezing ground to tunnel excavation" @default.
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- W2480959684 doi "https://doi.org/10.1201/b17435-36" @default.
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