滑坡地段隧道变形的地质力学模型及工程防治措施

研究目的:在山区铁路中,有很多隧道都修建在山体斜坡内,这些隧道常常会发生变形开裂等病害。调查表明,隧道变形病害与所在斜坡出现滑坡现象密切相关,并且严重危及铁路行车安全。针对这一问题,本文对隧道变形特征、滑坡与隧道变形的相互关系以及有效的工程防治措施等方面进行了研究。研究方法:在对滑坡地段近30座施工和运营隧道进行调研的基础上,根据隧道与滑面的相对位置关系及相应的隧道变形特征,建立地质力学模型。研究结果:建立了分析滑坡与隧道变形相互关系的4类地质力学模型,分析了4类模型的受力模式和变形特征。结合4类地质力学模型和工程实例,给出了针对隧道变形的不同特征选择工程防治措施的具体方法。研究结论:(1)隧道与滑面的相对位置关系是决定隧道变形特征的主要因素;(2)工程防治措施应与隧道的变形特征相结合。

THE GEOLOGICAL MECHANICS MODELS OF TUNNEL DEFORMATION AT LANDSLIDE SITE AND ENGINEERING CONTROLLING MEASURE

Research purpose: In mountain area, there are a lot of railroad tunnels are built in slope. And some tunnel's diseases, such as deformation and fracture, occur frequently in these tunnels. Ths survey shows that deformation and fracture of tunnel is correlative with landslide intimately and endangers security of trains running seriously. In view of the problem,this paper studied the deformation features of tunnels, the interrelation between landslide and tunnel deformation, and effective engineering measures to control tunnel deformation. Research result: Four typical geological mechanics models to analyze interrelation between landslide and tunnel deformation are given. And the mechanical patterns of tunnels situated different place in landslide are analyzed. On the basis of above, the engineering measures to control tunnel deformation at landslide site are studied too. The viewpoint is set forth that engineering measures should be suitable to the deformation features of tunnels, and the specific choosing method is given. Research conclusion: The relative position between tunnel and sliding plane is the major cause to determine the deformation features of tunnel; The engineering measures should be suitable to the deformation features of tunnels.