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26-07-2021 | Original Paper

Preliminary Study to Understand the Effect of Impact Loading and Rock Weathering in Tunnel Constructed in Quartzite

Journal:
Geotechnical and Geological Engineering
Author:
Mohammad Zaid
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Abstract

This study has carried out three-dimensional nonlinear elastoplastic analyses to understand the behaviour of tunnels constructed in rock having reinforced concrete lining when subjected to impact loading. The Lagrangian analysis tool has been used to create geometry and mesh the different parts of the present rock tunnel model through Abaqus/Explicit software. 3D lagrangian elements have been used to model the rock and concrete lining. The hoop and longitudinal bars of the reinforcement cage have been modelled using a beam element. The impact resistance behaviour of rock tunnel constructed in three different stages of weathered Quartzite has been simulated to understand the stability characteristics of the tunnel. The three-dimensional missile has been considered a rigid material to incorporate the maximum penetration in the rock when it hits the tunnel surface from 100 m. The four different missile weights i.e. 50 kg, 100 kg, 150 kg and 200 kg have been considered to contemplate the extent of deformation and damage In the tunnel. Moreover, the effect of overburden depth variation has been incorporated in terms of H/D ratio, which is defined as the ratio of overburden depth to diameter of the tunnel. The Ducker-Prager constitutive model with strain-rate dependence and dynamic increase factor is considered to simulate the behaviour of Quartzite rock. Johnson-Cook material model is used for steel bars of reinforcement cage and Ducker-Prager model with strain-rate and dynamic increase factor has been considered for reinforced concrete lining of the tunnel. The analyses results were studied for deformation, particle velocity, particle acceleration and damage in rockmass surrounding the tunnel and its reinforced concrete lining. It has been observed that reinforced concrete lining experiences a significant amount of compression and tension damage at the crown of the tunnel and this damage remains concentrated in the middle one-third section of tunnel length irrespective of change in weight of missile and H/D ratio. It has been concluded that a slightly weathered Quartzite rock tunnel has 18% more impact resistance than a medium weathered rock tunnel and 41% from a highly weathered rock tunnel. Moreover, the particle velocity is found to be inversely proportional to the strength of the surrounding rockmass. Further, particle acceleration generated due to impact loading changes proportionally with the rise in the degree of weathering in rocks. Also, it has been concluded that rock tunnels having a H/D ratio of 2.0 has 4-times higher impact resistance in terms of tension damage than the rock tunnels having a H/D ratio of 0.5.

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