Abstract：Research purposes:In recent years，because of various geological environmental problems，karst collapse phenomenon frequently occurs in existing railway subgrade in karst area，and it seriously influences the railway operation and traffic safety. In order to solve such geotechnical problems，based on the field inspection，geotechnical surveying， geophysical prospecting，drilling and other comprehensive exploration methods，this paper comprehensively analyzes the karst subgrade diseases of Shizhishan Station in the existing Wuhu-Tongling Railway，and provides the basis for subgrade disease treatment.
Research conclusions:(I)For the on-site complicated environmental conditions，adopt the comprehensive exploration technique to obtain the reliable geological data.(2)After the termination of pumping, karst collapse will still happen intermittently，the existence of such”hysteresis effect”should be paid enough attention to by relative personnel. (3)The operation practice after treatment proves that the investigation and treatment methods adopted in this paper are correct and effective and have significant effect，the research results of this paper provide a good reference for the similar karst subgrade treatment projects.
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2014, Vol. 31 
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