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Numerical Simulation of Soil-Tunnel Interaction Under Surface Blast Loading
In the present investigation, interaction of soil with the tunnel, subjected to surface blast load, has been numerically simulated using commercially available software LS-DYNA®. In this simulation, three different contact approaches, namely shared nodes, Desai thin-layer element, and contact friction method, are employed to understand their effect on soil-tunnel interaction. In shared node method, adjacent nodes of soil mass and tunnel are merged together, thus generating a fully jointed interface without allowing any slip between the interfaces, whereas in Desai thin-layer method, a thin layer of solid elements is introduced in between soil and the tunnel. In this approach, Mohr–Coulomb material model is used to define the behavior of the thin layer. Further, contact friction method is based on Coulomb friction model, wherein, interaction is defined using coefficient of friction. This approach allows to model slippage, separation, rotation, and rebound, thus representing the real physical behavior. FE models have been prepared using Multi-Material Lagrangian Eulerian (MM-ALE) formulation, wherein air, soil, and explosive are modeled using Eulerian formulation, and tunnel is modeled using Lagrangian formulation. FE analysis is conducted, wherein the effect of these three approaches is compared based on downward displacement of the tunnel crown. Based on this analysis, it is observed that the maximum displacement for the contact friction method is significantly lower in comparison with the other two methods used herein. Thus indicating the importance of proper understanding of the interaction modeling under such extreme loading.
Numerical Simulation of Soil-Tunnel Interaction Under Surface Blast Loading
In the present investigation, interaction of soil with the tunnel, subjected to surface blast load, has been numerically simulated using commercially available software LS-DYNA®. In this simulation, three different contact approaches, namely shared nodes, Desai thin-layer element, and contact friction method, are employed to understand their effect on soil-tunnel interaction. In shared node method, adjacent nodes of soil mass and tunnel are merged together, thus generating a fully jointed interface without allowing any slip between the interfaces, whereas in Desai thin-layer method, a thin layer of solid elements is introduced in between soil and the tunnel. In this approach, Mohr–Coulomb material model is used to define the behavior of the thin layer. Further, contact friction method is based on Coulomb friction model, wherein, interaction is defined using coefficient of friction. This approach allows to model slippage, separation, rotation, and rebound, thus representing the real physical behavior. FE models have been prepared using Multi-Material Lagrangian Eulerian (MM-ALE) formulation, wherein air, soil, and explosive are modeled using Eulerian formulation, and tunnel is modeled using Lagrangian formulation. FE analysis is conducted, wherein the effect of these three approaches is compared based on downward displacement of the tunnel crown. Based on this analysis, it is observed that the maximum displacement for the contact friction method is significantly lower in comparison with the other two methods used herein. Thus indicating the importance of proper understanding of the interaction modeling under such extreme loading.
Numerical Simulation of Soil-Tunnel Interaction Under Surface Blast Loading
Lecture Notes in Civil Engineering
Sitharam, T.G. (editor) / Pallepati, Raghuveer Rao (editor) / Kolathayar, Sreevalsa (editor) / Mandal, Jagriti (author) / Agarwal, A. K. (author) / Goel, M. D. (author)
2021-03-27
9 pages
Article/Chapter (Book)
Electronic Resource
English
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