Influence of tension cut-off on the undrained stability of unsuported shallow tunnels
DOI:
https://doi.org/10.24849/j.geot.2018.143.09Keywords:
shallow tunnels, limit analysis, tensile strengthAbstract
The present study aims to study the influence of considering null tensile strength on the stability of shallow tunnels excavated under undrained conditions. It is intended to determine the influence on the stability conditions in which the tunnel does not have any kind of support. The study is done using a numerical implementation of the static and kinematic theorems of limit analysis, considering the classic Tresca’s criterion and the Tresca’s criterion with tension cut-off. The calculations are performed under plane strain conditions, where the only load to which the system is subjected is the unit weight of the soil. The stability is evaluated using the classical parameter, for which proposals of representative equations are made. The analysis and the comparison between the results obtained considering or not the tension cut-off is performed, using the obtained mechanisms.
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