| Obtaining the influence rules of the carst tunnel by different cave style, and proceeding karst tunnel lining style research has directly push forward to improve the security of karst tunnel and accelerate the construction of karst tunnel.The thesis adopts the large-scale finite element analysis software of ANSYS 10.0 to proceeding numerical simulation computation. The thesis builds different models to simulate various conditions including not existing karst cave, existing karst cave, changing karst cave dimension and position. The thesis generalizes the impact law of varied karst cave to the single-line railway tunnel by summary and contrast analysis to the calculated result. Further studies on karst tunnel lining optimization have been got under condition of obtained influence law. Last the thesis draw some significant conclusions to the design and construction of carst tunnel.Main contents of the paper:The study of influence law on concealed carst cave to single-line railway tunnel lining includes top concealed carst cave, side concealed carst cave and bottom carst cave. And every case has four dimension changes. The study proceeds numerical simulation analysis under twelve work conditions.The paper present six tunnel lining optimization programs including 3 the concealed side and 3 bottom carst cave.After six optimization programs numerical simulation computation, optimization effect study to the carst tunnel by contrast the analysis result of fore-and-aft optimization has been summarizedWith the practical tunnel construct case, the paper pushes forward the useful suggestion to the design and construction in the carst tunnel according to theory analysis results.
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