Study On Reinforcement And Effect Test Of Karst Subgrade Of High Speed Railway

In recent years,with the rapid development of Chinese economic construction,high-speed railway construction is in full swing.However,the construction of high speed railway line inevitably crossed bad geological areas.One of the bad geological areas is the karst geological area.High stable performance is the basic requirement of high-speed train operation.The settlement of Subgrade in karst area is strict.One of the urgent problems to be solved in the engineering is how to quickly control the Karst Subgrade and test its effect.Therefore,it is of great significance to study the cause and mechanism of karst diseases,and the technology of remediation and effect evaluation.In this paper,by consulting the domestic and foreign information on the causes and treatment of karst diseases,combined with the Guizhou Guanling section of the Shanghai-Kunming passenger line station of Karst Subgrade Treatment Project Engineering,through fieldwork,theoretical analysis and calculation,site construction,the effect testing and other research methods,analysis the cause of the karst diseases.Based on the research results,this paper puts forward the method of karst reinforcement,calculates the design parameters,and gives the concrete construction technology,the test measure and the test results analysis of karst subgrade reinforcement.The main work is as follows:(2)This paper introduces the theory of rock mass grouting,including the mechanism of grout diffusion,and the analysis of the influence of geological factors on grouting.The theoretical analysis based on research project,aiming at Guanling station Karst Subgrade Engineering,grouting design scheme.(3)Combined with the construction of the project site,this paper puts forward the concrete scheme of the grouting construction technology of Karst Subgrade,including construction preparation,drilling technology,grouting technology,and summarizes the grouting control process.(4)The transient Rayleigh wave method,the direct current resistivity sounding method and the drilling core are used to test the reinforcement effect of the research project.