隧道-滑坡体系应力变形机理模型试验研究

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。

RESEARCH ON STRESS AND STRAIN MECHANISM OF TUNNEL-LAND SYSTEM

With the rapid development in the Midwest infrastructure, large amount of road to the area across the complex topography and geology in the region with a large number of complex landslides, sometimes it have to the tunnel landslide, form the tunnel - landslide system, tunnel - the characteristics of force and deformation of landslide system is very complex, became the central and western regions is one of the most main difficulties in tunnel engineering. Chongqing yangjiawan tunnel general expressway is a typical case, this article, through detailed geological exploration report and the landslide deformation monitoring data, and combining with indoor model test, analyzed the yangjiawan tunnel -general deformation mechanism of landslide system, draws the following conclusions: (1) The tunnel stress similar to that of beam structure in landslide, deformation of the tunnel center is the largest, then as to both sides of the extension, the deformation decrease gradually. (2)The spacing between tunnel and sliding zone is affected one of the key factors of the tunnel, the same condition, the tunnel distance nearer the sliding zone, the pressure on it.