Study On Collapsible Loess Foundation Deformation And Control Measures Of Settlement

The rapid development of high-speed railway, greatly promots the development ofChina’s economy and society. High-speed train has high speed, and is of high technologycontent, in order to ensure passenger safety and comfort, demand of high-speed rail track onthe basis is strict, there must be a better ride comfort and stability in foundation of the nexttrack, and the issue of collapsible loess foundation deformation will presents a challenge torapid development of high-speed railway. In this paper, the based on new Datong to Xi’anpassenger dedicated line Yongji North Station project, to carry out research of collapsibleloess mechanism and control measures of loess foundation deformation.Through laboratory and field trials in situ, collapsible loess physical and mechanicalproperties of the particle size distribution, density, moisture content, density, liquid andplastic limits were analyzed; shear strength, compression characteristics, collapsible andother engineering characteristics were analyzed, to provide data support research offoundation settlement mechanism collapsible loess; the paper expounded settlementmechanism collapsible loess foundation, analyzed the collapsible loess soil additional stress,additional stress of the bottom cushion and variation pile bottom pile additional stress,analyzed the sealing layer of soil subsidence and grill change and displacement piledisplacement characteristics of different foundation depths; due to collapsible loessfoundation settlement problem of Datong to Xi’an passenger dedicated line Yongji NorthStation project, a pile of cement soil column hammer Chongkuo (compaction pile)+CFGpile in collapsible handle deep loess foundation construction technology is proposed,reaching the double effect of elimination of collapsible loess and improve the bearingcapacity.