Numerical Analysis of the Influence of Tunnel Excavation on the Changes of Surrounding Rock Stress and Displacement

2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR) Pub Date : 2021-11-06 DOI:10.1109/ICHCESWIDR54323.2021.9656197

Libo Ding, Xing Chen, Youchuan Wu, Xiaopeng Wang

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Abstract

The Argveta exit of No. 2 Tunnel in Georgia is taken as the research object, and the three-dimensional geological numerical analysis model of the tunnel is established. The model simulates the construction condition of full-section tunnel excavation through passivation, and discusses the variation law of stress and displacement caused by excavation. According to the study results, with the construction of the tunnel, the surrounding rock pressure increases gradually, which has a lot to do with the tunnel excavation footage and temporary support time; the deformation of tunnel entrance is greatly affected by tunnel excavation, which has a gradual Increasing trend; for the simultaneous construction of tunnels with different spans, the impact of the excavation of a large-span tunnel on the rock, soil, temporary lining and the secondary lining is greater than the stress and deformation of a small-span tunnel.

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隧道开挖对围岩应力和位移变化影响的数值分析

以佐治亚州2号隧道Argveta出口为研究对象，建立了该隧道三维地质数值分析模型。该模型通过钝化模拟全断面隧道开挖的施工条件，讨论了开挖引起的应力和位移变化规律。研究结果表明，随着隧道的施工，围岩压力逐渐增大，这与隧道开挖进尺和临时支护时间有很大关系;隧道洞口变形受隧道开挖影响较大，且有逐渐增大的趋势;对于不同跨径隧道同时施工，大跨径隧道开挖对岩石、土壤、临时衬砌和二次衬砌的影响大于小跨径隧道的应力和变形。

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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2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)

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