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  Influence of Radial Joints in Segmental Lining 3D Modelling

  The use of TBMs over conventional excavation methods has increased over the last decades, in favour of enhanced health and safety, reduction in costs and construction times, better control in difficult ground and improved quality of the finished product. Consequently, the behaviour of segmental linings has been widely explored, with a focus on radial joints which play an important role in the structural response of segmental lining, as their behaviour affects both stiffness and structural capacity of the ring. In this context, this paper seeks to investigate and compare the simplified approach proposed by Muir Wood (1975), often adopted in the UK, with the explicit modelling of flat-flat joints by means of non-linear rotational springs. Therefore, different tunnel scenarios and geometries are modelled in 2D and 3D, providing an insight on the complex mechanical response of segmental lining, while demonstrating that the explicit modelling of radial joints allows for a better understanding of the lining behaviour.

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