| The tunnel engineering has always been troubled by the karst issue.In recent years, with the development and construction in western China, a large number of road tunnels and railway tunnels have been building in extensive karst regions, the construction problems have been complex increasingly, how to improve the accuracy of karst geological prediction has become an issue which is be solved urgent. This paper through theoretical analysis and field testing methods, combined with support projects, study of tunnel comprehensive geological prediction in complex karst region, in order to improve the accuracy of geological prediction in karst region.The specific research of this paper says:(1) Analysised the causes,distribution and feature of the karst hazards in karst region, studyed the harm which the karst geological disasters to the tunnel, determined the range and content of tunnel geological prediction in karst region.(2) Discussed the working principle of the TSP method, observation methods and data interpretation methods, discussed the typical problems in data acquisition and data processing, established a Criterion of common adverse geological.(3) Discussed the working principle of GPR method, observation methods and data interpretation, summarized the features and the interpretation of principles in various adverse geological radar images.(4) Discussed the geological prediction problem of high risk tunnel in complex karst region.Compared the excellence and flaw of the TSP method and GPR method,pointed the advantage of the comprehensive geological prediction method of "TSP+GPR" and had practical application in railway tunnel. The application shows that:an comprehensive geological prediction method can greatly improve the accuracy of geological prediction in karst region. |
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