王丽丽, 梁庆国. 2018: 考虑入洞高程效应的越岭隧道洞口段动力响应分析. 工程地质学报, 26(s1): 174-180. DOI: 10.13544/j.cnki.jeg.2018021
    引用本文: 王丽丽, 梁庆国. 2018: 考虑入洞高程效应的越岭隧道洞口段动力响应分析. 工程地质学报, 26(s1): 174-180. DOI: 10.13544/j.cnki.jeg.2018021
    WANG Lili, LIANG Qingguo. 2018: DYNAMIC RESPONSE OF TUNNEL THROUGH MOUNTAIN UNDER THE INFLUENCE OF THE HOLE ELEVATION. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 174-180. DOI: 10.13544/j.cnki.jeg.2018021
    Citation: WANG Lili, LIANG Qingguo. 2018: DYNAMIC RESPONSE OF TUNNEL THROUGH MOUNTAIN UNDER THE INFLUENCE OF THE HOLE ELEVATION. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 174-180. DOI: 10.13544/j.cnki.jeg.2018021

    考虑入洞高程效应的越岭隧道洞口段动力响应分析

    DYNAMIC RESPONSE OF TUNNEL THROUGH MOUNTAIN UNDER THE INFLUENCE OF THE HOLE ELEVATION

    • 摘要: 针对越岭隧道在穿越沟谷时所遇到的入洞高程问题,以西部地区黄土隧道为研究背景,采用三维有限元数值模拟的方法,分别设置了h=0,h=5m,h=10m,h=15m,h=30m共5种不同入洞高程的模型,探究了入洞高程影响下的坡面及隧道洞口段的动力响应规律,研究结果表明:入洞高程的变化对隧道及坡面的动力响应有重要影响。坡面位移峰值与应力峰值随入洞高程的增大呈一阶线性减小的变化规律。隧道洞口段的动力放大效应明显,且放大效应受入洞高程变化的影响。洞口附近的坡面应力出现明显的应力集中现象,隧道仰拱的加速度与位移响应表明:入洞高程越大,洞口放大效应段越短。因此,越岭隧道的抗震设计中应考虑隧道的入洞高程效应,根据入洞高程的变化,隧道的抗震设防长度和坡面重点加固区域应随之变化。

       

      Abstract: When the mountain tunnel pass through the mountain and valley, the tunnel will inevitably be located on the slopes of different heights. Different hole elevation of the tunnel, the dynamic response under seismic load is bound to be different. Taking the loess tunnel of Western region as the engineering background, using the method of three-dimensional finite element numerical simulation, five different hole elevation model were set up(The pole elevation were h=0m, h=5m, h=10m, h=15m, and h=30m). In this paper, we explored the dynamic responses of the slope and the tunnel portal section under the influence of hole elevation. The results showed that:The change of the hole elevation has an important effect on the dynamic response of tunnel and slope. The displacement peak and peak stress of slope decreased with increasing hole elevation. The amplification effect is very obvious at the tunnel portal section, and the amplification effect is different by the affection of hole elevation. Obvious stress concentration phenomenon occurred on the slope near the entrance of the tunnel, and the dynamic response of acceleration and displacement of the tunnel invert showed that the hole elevation was larger, the length of amplification effect section was short. Therefore, the tunnel elevation effect should be considered in the seismic design of the crossing tunnel. According to the change of hole elevation of the tunnel, the anti-seismic fortified length and the key reinforcement area of the slope should be changed accordingly.

       

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