Experimental Study on Deep Soft Ground of High Speed Railway Treated with Bored Pile-continuous Thin Plate Structure

The settlement and the long-term dynamic stability of soft ground were the key technical problems,when the low subgrade of high speed railway with ballastless track was constructed in deep soft soil region.The soft ground will have large residual settlement under embankment load because of its high compressibility and the foundation soil may have greater plastic deformation arise from long-term large dynamic load in the operation process,which can seriously affects the ride comfort of ballastless track.In order to decrease settlement and improve the long-term dynamic stability of the low embankment on deep soft ground in Shanghai Hongqiao area of Beijing-Shanghai High Speed Railway,the bored pile-continuous thin plate structure was firtstly used with detailed monitoring and testing.The analysis results indicate that this structure has the characteristic of smaller post-construction settlement and better resistance capacity to dynamic load deformation,so it can meet the controlling requirements of ballastless track on high speed railway.