| Taking the karst tunnel of liupanshui-zhanyi's first section, which belongs to the second line of the Guiyang-Kunming railway's co-using as the research object. And through the construction practice of the karst tunnel, such as MaGa tunnel, Xinminghu 1 and 3# tunnel, Xinwanzizhai 1 and 2# tunnel, Liupanshui double-line tunnel, etc. To solve the karst tunnel's construction problems, such as taking the pointed measures to different locations, different forms and different sizes of karst, and to reserch different treatments of lining,which caused by the karst tunnel, then get the systematical summarizes for the karst tunnel's construction, through the treatment of karst tunnel construction technology on the sector 1 of Liupanshui-Zhanyi double track railway, summing up the technology of construction in karst tunnels.The thesis introduces the present situation of karst tunnel, discussed the construction treatments for the different forms, different sizes, different locations of the karst, as well as to avoid the dangers in the construction and operation caused by the karst.it also recommends methods for the karst tunnel geological prediction and the treatments to groundwater in karst tunnels. Through numerical simulation on karst tunnel by utilizing ANSYS finite element analysis software, to evaluate the treatments and steps of karst tunnels.Through the specific construction practice in the Xinwanzizhai railway's 1# tunnel, concluding the construction technology of karst tunnel. In the future, for similar karst tunnel, we can adopt corresponding measurements to slove the problems in the construction, then meet the needs of construction. At the same time, has important guiding significance for both the survey, design and construction of karst tunnel in the future's area and the water disasters, mud harm and surface subsidence in existing karst tunnel. |
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