%0 Journal Article
%T 隧道开挖对滑坡体稳定影响试验研究<br>Experimental Research on the Influence of Tunnel Excavation on the Stability of Landslide
%A 周琪
%A 杨钦
%J Hans Journal of Civil Engineering
%P 327-335
%@ 2326-3466
%D 2022
%I Hans Publishing
%R 10.12677/HJCE.2022.113036
%X 近年来，我国公路建设的重心从东部平原地区逐渐延伸到西北地区，西北地区的地形地貌以及地质情况复杂，而复杂的地质环境会导致公路不可避免穿越滑坡体。在老滑坡体中开挖隧道往往会引起新的斜坡滑动变形，导致一系列的隧道病害。本文拟采用模型试验和数值模拟相结合的方法，模拟出滑坡隧道体系，通过在坡体后部加载促使滑坡体发生蠕动，并在滑坡体表面设置百分表来监测滑坡体的位移变形情况；用有限元软件建立滑坡隧道模型，观察不同开挖深度时的坡体位移情况，探索隧道开挖对滑坡体稳定性的影响。结合模型试验和数值模拟得出以下结论：隧道的开挖会引起滑坡体的位移变形，隧道洞口与基岩的中间位置竖向位移最大，而滑坡体与基岩的交界处水平位移最大；隧道开挖过程中，越接近滑带，沉降量越大，隧道进入基岩后变逐渐趋于稳定，这是因为开挖进尺较大时，隧道的受力情况更接近悬臂结构，容易在隧道与滑带交界处产生集中应力，导致隧道变形，严重时可发生破坏。<br />
In recent years, the focus of highway construction in China has gradually extended from the eastern plain to the northwest. The topography and geological conditions of the northwest are complex, and the complex geological environment will inevitably lead to the highway passing through the landslide. Excavating tunnel in old landslide will often cause new slope sliding deformation and a series of tunnel diseases. In this paper, the landslide tunnel system is simulated by the combination of model test and numerical simulation. The creep of the landslide is promoted by loading at the rear of the slope, and the displacement and deformation of the landslide is monitored by setting a dial indicator on the surface of the landslide; the landslide tunnel model is established with finite element software; the slope displacement at different excavation depths is observed; and the influence of tunnel excavation on the stability of landslide is explored. Combined with model test and numerical simulation, the following conclusions are drawn: the excavation of tunnel will cause the displacement and deformation of landslide mass, the vertical displacement in the middle of tunnel portal and bedrock is the largest, and the horizontal displacement at the junction of landslide mass and bedrock is the largest; In the process of tunnel excavation, the closer it is to the sliding zone, the greater the settlement, and the tunnel will gradually become stable after entering the bedrock. This is because when the excavation footage is large, the stress condition of the tunnel is closer to the cantilever structure, which is easy to produce concentrated stress at the junction of the tunnel and the sliding zone, resulting in tunnel deformation and damage in serious cases.
%K 滑坡隧道，模型试验<br>Landslide Tunnel
%K Model Test
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=49652