Abstract：Research purposes:In recent years，high-speed railway construction has developed rapidly，which has strict control standard for sedimentation of roadbed. The roadbed of high-speed railways take places most easily on settlement because it is extremely sensitive to pumping of ground-waters，landfill of spoil，excavation of deep pit, changes in the environment and so on. Given that the short history of domestic rapid railway and a shortage of treatment experiences of roadbed subsidence，it is necessary to carry out research work on reinforcement and quality testing for subgrade settlement of high-speed railway，which could provide expert and consultants service for the same roadbed problems.
Research conclusions:Through researching Nn speed railway in the East China，pile，sleeve valve pipe，drilling we can draw the features of subgrade settlement technology of a part of some high- the following conclusions:(1)This technology which contains jet grouting practical reinforcement method for similar soft subgrade settlement problems. (2)The methods of core-drilling，surface save testing，settlement monitoring can effect of soft subgrade settlement of high-speed railway.(3)The research results effectively test the reinforcement provide references for the regula- tion design and construction of the similar engineering.
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2015, Vol. 32 
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