Stochastic assessment of 3-D tunnels in near-fault ground motion using modified domain reduction method

Banjare, B and Avatar, GRKC (2024) Stochastic assessment of 3-D tunnels in near-fault ground motion using modified domain reduction method. In: International Journal for Numerical and Analytical Methods in Geomechanics .

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Abstract

A robust assessment of tunnels due to uncertainties present in soil and ground motion properties can affect the dynamic response of these structures. In this paper, a stochastic analysis considering an aleatory variability in shear velocity Vs by performing Monte Carlo simulations and assessing its influence on underground tunnels. To numerically assess the response of the soil-tunnel system to near-fault earthquake ground motion, the required computational domain usually spans multiple kilometers including both earthquake fault and the structure. Thus, these simulations are computationally expensive. An efficient alternative method, that is, the Domain Reduction Method (DRM), in which a modular two-step methodology for reducing the computational costs in the large domain analysis is employed. A 3-D soil-tunnel structure interaction is modeled to simulate the response of tunnel subjected to an inclined earthquake fault. The numerical simulation of the soil-tunnel-fault system is conducted in an open-source FE package called Multi-hazard Analysis for STOchastic time DOmaiN phenomena (MASTODON) based on MOOSE framework. The interactive analyses are carried out for three distinct types of soils based on National Earthquake Hazards Reduction Program (NEHRP) provision, that is, soft, medium, and hard, by generating 130 realizations. The results provide many insights into the influence of local site effects, that is, frequency shift for the peak response and the importance of input ground motion characteristics that govern the response of underground structures. The dynamic response of the structure is very sensitive to the uncertainty in rock material properties, especially, the stiffness of the rock sample and the shear wave velocity. © 2024 John Wiley & Sons Ltd.

Item Type:	Journal Article
Publication:	International Journal for Numerical and Analytical Methods in Geomechanics
Publisher:	John Wiley and Sons Ltd
Additional Information:	The copyright for this article belongs to John Wiley and Sons Ltd.
Keywords:	Dynamic response; Earthquakes; Faulting; Intelligent systems; Monte Carlo methods; Open systems; Shear flow; Shear waves; Soil structure interactions; Stochastic systems; Time domain analysis; Tunnels; Underground structures; Wave propagation, Domain reduction method; Dynamic soil-structure interaction; Earthquake fault; Inclined seismic wave propagation; Near fault ground motion; Reduction method; Seismic wave propagation; Stochastic analysis; Stochastic assessment; Uncertainty, Soils
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering) Division of Mechanical Sciences > Civil Engineering
Date Deposited:	29 May 2024 04:18
Last Modified:	29 May 2024 04:18
URI:	https://eprints.iisc.ac.in/id/eprint/84900

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