Coupled FEM-DEM analysis of mountain tunnels subjected to internal explosion and explosion induced landslide

IF 1.2 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2023-07-13 DOI:10.1680/jstbu.22.00169

J. Mandal, M. Goel

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Abstract

In the present study, the onset of a landslide induced by an explosion within a shallow-buried mountain transit tunnel was simulated using a coupled FEM-DEM method. Two cases of mountain tunnel were considered for the investigation: continuous tunnel passing through the mountain body and terminal end of the tunnel. The effect of location of explosion inside the tunnel and the angle of slope on the dynamic response of the tunnel and landslide mechanism was investigated. The initiation of landslide and the location of mobilisation of overlaying soil varied as the location of explosion was changed. Time of initiation increased when the explosive was position away from the mouth of the tunnel. Change in the location of explosive also affected the response of the tunnel. Highest displacement and acceleration were observed at the crown in the tunnel section where the explosive was positioned. However, regardless of the location of explosive, substantially high displacement and acceleration were still observed at the mouth of the tunnel. Early triggering of landslide happened when the slope angle was increased for the same location of explosion. However, the effect of slope angle on the response of tunnel was minimal.

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山体隧道内爆与爆炸诱发滑坡的FEM-DEM耦合分析

本文采用FEM-DEM耦合方法，对某浅埋山地运输隧道爆炸引发的滑坡进行了数值模拟。本文研究了两种山地隧道的情况:连续隧道穿过山体和隧道的末端。研究了隧道内爆炸位置和边坡角度对隧道动力响应的影响及滑坡机理。随着爆炸位置的变化，滑坡的起爆和上覆土的动员位置也发生了变化。当炸药位置远离隧洞口时，起爆时间增加。炸药位置的变化也会影响隧道的响应。在放置炸药的隧道段顶部观察到最大的位移和加速度。然而，无论炸药的位置如何，在隧洞口仍然观察到相当高的位移和加速度。在同一爆炸位置，边坡角度增大时，发生了滑坡的早期触发。而坡角对隧道响应的影响较小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Civil Engineers-Structures and Buildings 工程技术-工程：土木

CiteScore

3.40

自引率

6.20%

发文量

审稿时长

12 months

期刊介绍： Structures and Buildings publishes peer-reviewed papers on the design and construction of civil engineering structures and the applied research associated with such activities. Topics include the design, strength, durability and behaviour of structural components and systems. Topics covered: energy conservation, people movement within and around buildings, strength and durability of steel and concrete structural components, and the behaviour of building and bridge components and systems