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  Estimation of lining performance of tunnels through back analysis

  This paper presents a numerical study regarding the lining performance of a tunnel built in cemented fine-grained stiff soils. This study aims at establishing more rational design criteria that take into account explicitly the lining performance. An instrumented tunnel and open shaft were modelling using series of tridimensional finite difference models, developed with FLAC3D. The strength and deformability parameters were established through a back modulus of the soil found in the site. Then, those were used to predict the settlements, at the tunnel top and in the surface. An open shaft-tunnel connection built in a densely populated northwest area of Mexico City was considered as a case study. The ground settlements, internal forces and displacements acting on the tunnel lining were computed taking into account the stages of the tunnel construction. A good agreement was found between the measured and calculated deformations. The performance of the tunnel lining was based on the interaction diagram analysis.

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