| In view of the particularity and complexity of China’s mountainous terrain and geological conditions, it have to use the form of a tunnel through the area where probably exists the adverse geological problems such as landslide when building roads or railways in these areas, at the same time, mountain tunnel put into operation maybe evolved into landslide tunnel due to slope creep of rock and soil mass. In view of the research present status of the landslide tunnel, the paper adopts theoretical analysis, numerical simulation and field measurement, etc research methods, based on the analysis of the types of the tunnel landslide and main failure mechanism, systemic research on force analysis and deformation control technology of tunnel lining under the orthogonal condition of landslide sliding and axes, which has a certain guidance and reference significance for the design and construction of similar projects, main research results are as follows:⑴According to the relative position relations of tunnel and landslides, summed up the four kinds of tunnel geological mechanical model, mechanical model of tunnel is analyzed in the landslide thrust and the characteristics of stressed deformation of surrounding rock pressure, put forward the corresponding case diagram of bearing force and deformation characteristics of tunnel, and to each kind of lining crack formation are analyzed in the model; Finally analyzed the terrain method for determining surrounding rock pressure under bias load and deformation characteristics of landslide area for further research the stress of the tunnel deformation mechanism of this kind of engineering problems and control has a certain reference value.⑵According to the relative position relations of tunnel and landslide, the four kinds of tunnel geological mechanical model are summed up, the characteristics of stressed and deformation of each mechanical model of tunnel is analyzed in the landslide thrust and surrounding rock pressure, the corresponding case diagram of bearing force and deformation characteristics of tunnel is put forward, and the causes of cracks in lining of each model are analyzed; Finally, the terrain method of surrounding rock pressure under bias load and deformation characteristics of tunnel are analyzed, which has a certain reference value for further research on the force and deformation mechanism of tunnel in landslide area and controlling this kind of engineering problems.⑶Based on the force and deformation mechanism of landslide tunnel and the theoretical calculation formula of tunnel lining internal deduced under the orthogonal condition of landslide sliding and axes, and combined with engineering example, the internal force distribution form of tunnel lining with theoretical calculation method is analyzed, and the correctness of the theoretical calculation formula is verified with the finite element analysis method. On this basis, the effect on the lining of the internal force distribution in the parameters of soil and lining are analyzed, and internal force distribution lining of under the influence of various parameters are concluded, which provide certain theoretical basis for the optimization design of the tunnel lining and the comprehensive improvement of the corresponding measures.⑷ Based on the analysis of tunnel and landslide deformation pre-reinforcement technology and mechanism, combining with the practical situation of tang tableland tunnel entrance section, the comprehensive improvement measures, and through the field monitoring, evaluated the effect of the comprehensive improvement scheme. Monitoring results show that the scheme can ensure the follow-up of the tunnel construction safety and efficiency, and can effectively reduce the disturbance of the adverse impact on slope stability in tunnel construction, and anti-slide pile supporting structure combined together to form the concrete lining of road tunnel and composite reinforcement structure, effectively controled of slope sliding, improved the slope stability. |
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