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Seismic Vulnerability Assessment of Steel Fiber Reinforced Shotcrete Lined (SFRS) Tunnel: A Himalayan Case Study

  • Original Article
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Journal of the Geological Society of India

Abstract

The entire Himalayan arc is predicted to produce a series of significant earthquakes and the subsequent great earthquakes of magnitude 8.0 and higher. A substantial amount of rock tunneling is being carried out in the Himalayan region to meet the growing demand for transportation, power, and other infrastructure projects. Earthquake forces influence the final design of the tunnel, which requires further strengthening of the concrete lining and improvement in tunnel support. Because of increasing importance, it is essential to combine the dynamic forces and displacements produced by seismic ground movements into the design stage for tunnels. In this paper, a numerical analysis has been carried out to assess the seismic performance of a proposed hydropower tunnel of 8.8m diameter (horseshoe-shape) in Uttarakhand, India. The impact of earthquakes on underground structures such as tunnels is often considered to be insignificant. However, the results of this study show how that stress from seismic loads can be damaging to the stability of the tunnel. In this study, a pseudo-static approach was adopted to assess the impact of the earthquake on the tunnel lining for the sections located in different rocks namely slate (Q=3.4), quartzite (Q=6), and dolomitic limestone (Q=5.2), respectively. Pseudo-static analysis findings suggest there is a 35% increase in the lining forces for an impact of earthquake for the tunnel section situated in Slate. Furthermore, displacements and damage-prone areas are determined to assess the damage to the tunnel, which could be helpful for rapid evaluations of potential future damage.

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Srivastav, A., Satyam, N. & Rajan, K.S. Seismic Vulnerability Assessment of Steel Fiber Reinforced Shotcrete Lined (SFRS) Tunnel: A Himalayan Case Study. J Geol Soc India 98, 185–192 (2022). https://doi.org/10.1007/s12594-022-1957-6

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  • DOI: https://doi.org/10.1007/s12594-022-1957-6

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