Research methods: According to the geologic and landform feature of the section with karat collapse occurred during the construction and operation of the raising speed renovation project of Zhe-Gan railway Iine , this paper analyzes the occurring cause of karst collapse, integrates the karst prospecting data and construction regulation effect. And combining with karst regulation experience on other railway lines, the discussion on karst regulation principle has been carried out.
Research conclusions: The karst ground collapse regulation scope on high speed railway shall be expanded to the section prone to collapse with the thickness of earth surface cohesiveness less than or equal to 20 m ( absolute thickness ).The line shall adopt the bridgework for the serious karat collapse section with large pumping demand. During karat regulation construction, the combination principle of prospecting and grouting must be carried out, the regulation scope and depth as well as pressure grouting parameter and technology shall be adjusted as per the actual condition to realize the purpose of controlling karat ground collapse.
2007, Vol. 24 
