隧道-滑坡体系应力变形机理模型试验研究

发布时间：2018-06-05 14:50

本文选题：隧道 + 滑坡　；参考：《科学技术与工程》2017年29期

【摘要】：随着中国中西部地区的基础建设快速发展,大量的道路需要穿越地质条件复杂的区域;在这些地区分布着大量的滑坡,有时不得不面对隧道穿越滑坡的情况,形成隧道-滑坡体系。隧道-滑坡体系的受力和变形特征极为复杂,成为了中西部地区隧道工程中的最主要难点之一。重庆巫奉高速公路的杨家湾隧道就是典型的案例,以重庆杨家湾隧道滑坡为原型,通过室内模型试验,分析研究了杨家湾隧道-滑坡体系的变形机理;并通过FLAC3D有限元计算软件验证了模型试验得出的规律,得出以下结论:(1)隧道在滑坡体中的受力类似于简支梁结构,隧道中间位置的变形最大;然后随着向两侧的延伸,变形逐渐减小。(2)隧道与滑带之间的间距是影响隧道受力的关键因素之一,同等条件下,隧道距离滑带越近,其受到的压力越大。
[Abstract]:With the rapid development of infrastructure in the central and western regions of China, a large number of roads need to pass through areas with complex geological conditions; there are large numbers of landslides in these areas, and sometimes they have to face the situation of tunnels passing through landslides. Forming tunnel-landslide system. The characteristics of stress and deformation of tunnel-landslide system are very complex, which has become one of the most important difficulties in tunnel engineering in the central and western regions. The Yangjiawan Tunnel of Wubong Expressway in Chongqing is a typical case. The deformation mechanism of Yangjiawan tunnel-landslide system is analyzed by laboratory model test. The law of model test is verified by FLAC3D finite element calculation software, and the following conclusion is drawn: the stress of tunnel in landslide is similar to that of simply supported beam structure, and the deformation in the middle of tunnel is the biggest, then with the extension to both sides, The distance between the tunnel and the slip zone is one of the key factors affecting the tunnel stress. Under the same conditions, the closer the tunnel is to the slip zone, the greater the pressure is.
【作者单位】：中铁西北科学研究院有限公司;中国铁道科学研究院;
【分类号】：U451.5

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