Energy consumption analysis of different geometries of precast tunnel lining segment numerically.

Tunnel plays an easy functionality solution in complex conditions. The functionality role of the tunnel depends on the performance of tunnel lining segment. The structural and durable ability of the tunnel lining segment depends on the geometry of the lining segment. So, optimization of the various geometries of the lining has to be studied for understanding the lining segmental behaviour and its energy consumption criteria. This paper conducts a numerical investigation on tunnel lining segments with various geometries, such as rectangular, hexagonal and trapezoidal to replicate the flexural load test and thrust load test. In this study, the modelling of the metro tunnel lining segment is done using AutoCAD Software. The models are imported to the finite element software ANSYS 18.1 to determine the maximum principal stress, maximum principal strain and total displacement by the application of unit point load of 1 kN at the crown for flexural load test and lateral load of the same at the supports for thrust load test. The boundary conditions adopted are simply supported for all the models. The total displacement obtained in both the loading conditions is compared with theoretical displacement. The work suggests the optimized shape of the tunnel lining segment based on two different loading conditions and the best solution in terms of concrete consumption, energy intensity and carbon emission. The rectangular lining segment consumes less concrete of 1.36 m, which is less compared to hexagonal segment and trapezoidal segment by 43.38% and 4.41%, respectively.