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Probabilistic evaluation of tunnel face stability in spatially random soils using sparse polynomial chaos expansion with global sensitivity analysis

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Abstract

The sparse polynomial chaos expansion is employed to perform a probabilistic analysis of the tunnel face stability in the spatially random soils. A shield tunnel under compressed air is considered which implies that the applied pressure is uniformly distributed on the tunnel face. Two sets of failure mechanisms in the context of the limit analysis theory with respect to the frictional and the purely cohesive soils are used to calculate the required face pressure. In the case of the frictional soils, the cohesion and the friction angle are modeled as two anisotropic cross-correlated lognormal random fields; for the purely cohesive soils, the cohesion and the unit weight are modeled as two anisotropic independent lognormal random fields. The influences of the spatial variability and of the cross-correlation between the cohesion and the friction angle on the probability density function of the required face pressure, on the sensitivity index and on the failure probability are discussed. The obtained results show that the spatial variability has an important influence on the probability density function as well as the failure probability, but it has a negligible impact on the Sobol’s index.

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Acknowledgements

The first author thanks the China Scholarship Council for providing him with a Ph.D. Scholarship for his research work, and the financial support by the National Basic Research 973 Program of China (2013CB036004) is also greatly appreciated.

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  1. Laboratory 3SR, CNRS UMR 5521, Grenoble Alpes University, Grenoble, France

    Qiujing Pan & Daniel Dias

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  1. Qiujing Pan
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  2. Daniel Dias
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Correspondence to Daniel Dias.

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Pan, Q., Dias, D. Probabilistic evaluation of tunnel face stability in spatially random soils using sparse polynomial chaos expansion with global sensitivity analysis. Acta Geotech. 12, 1415–1429 (2017). https://doi.org/10.1007/s11440-017-0541-5

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  • DOI: https://doi.org/10.1007/s11440-017-0541-5

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