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Numerical Simulation of Explosion in Twin Tunnel System

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Abstract

Rapid growth of urban population in Indian cities have led traffic congestion leading to demand for scientific utilization of underground space. Immediate underground level and deep level underground below the major arterial roads are the sustainable spaces available for meeting the demand of the future traffic/transport. Due to recent increased transit activities it has become one of the soft targets by terrorists or prone to catastrophic accidents in recent years which have increased the importance of rock structures study under explosive loading. In this paper, the response of a underground metro tunnel subjected dynamic loads have been investigated including explosive capacity (30 kg TNT), ground characteristics, liner thickness and blast pressure characteristics. Blast pressure representing CONWEP air blast loading model with positive over pressure phase was applied to lining of tunnel. A three dimensional explicit finite element method was used to analyze dynamic response and damage in twin tunnels of underground metro. It is found that liner of thickness 28 cm will start deforming at the explosive loading of more than 65 kg TNT.

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Acknowledgements

Fourth Author Acknowledges DST international division for funding SenSE4Metro project as an initiative in civil security research to Indian Institute of Science Bengaluru in Indo-German collaborative project between German Institute and Indian Partners.

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Authors and Affiliations

  1. Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, India

    A. K. Verma, Manish Kumar Jha & Srinivas Mantrala

  2. Department of Civil Engineering, Indian Institute of Science, Bengaluru, 560027, India

    T. G. Sitharam

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  1. A. K. Verma
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  2. Manish Kumar Jha
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  3. Srinivas Mantrala
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  4. T. G. Sitharam
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Correspondence to Manish Kumar Jha.

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Verma, A.K., Jha, M.K., Mantrala, S. et al. Numerical Simulation of Explosion in Twin Tunnel System. Geotech Geol Eng 35, 1953–1966 (2017). https://doi.org/10.1007/s10706-017-0219-7

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  • DOI: https://doi.org/10.1007/s10706-017-0219-7

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