Based on the construction of high risk tunnels in Guiguang-Guangzhou high-speed railway,several new technologies were developed for high-risk tunnel construction.First,an integrated advanced geological prediction was developed for tunneling in karst area.Then,a new system of ventilation by involving the dedusting technology was proposed and used in the field,which received a good air quality.Finally,a method to minimize the distance between the working face and the invert installation was proposed by optimizing the invert installation and adopting the micro bench method.Applying the method to the project obtained an excellent result.The achievement obtained for this study would be able to provide a valuable reference to similar projects in the future.
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