Influence of initial plastic anisotropy of overconsolidated clays on ground behaviour during tunneling |
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Authors: | J R Maranha A Vieira |
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Institution: | (1) Civil Engineering National Laboratory (LNEC), Av. do Brasil, 101, 1700-066 Lisbon, Portugal |
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Abstract: | In order to evaluate the influence of the initial plastic anisotropy in the excavation of a tunnel, a “bubble” bounding surface
model for structured soils, formulated by Kavvadas and Belokas (Proc. 10th IACMAG Conf., 2001), was implemented in the explicit
finite difference code FLAC. Two different initial stress (K
0) conditions were considered. The size and shape of the initial bounding surfaces were specified to be consistent with the
initial stress field. The distorted and rotated shape of the bounding surface, supported by experimental results, defines
the anisotropy of shear strength, which is shown to have a significant influence on the displacements. There is also considerable
sensitivity of the soil model to the initial stress field. |
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Keywords: | |
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