Study on Field Test and Treatment of Soft Soil Subgrade of Speed-raising at the Railway

With the large-scale speed-raising of the train on existing-railway,the problems of the railway subgrade are worsened more and more.The subgrade's reinforcement becomes the key item in the modification projects.The field test of subgrade with disease has been carried out on Jiang-Pu and Hu-Ning main railway line.The main technical conditions of speed-raising are analyzed on Existing-railway over Soft Soil.According to field test,the existing-railway soil subgrade does not meet the specific requirements for speed-raising and must be reinforced.The treatment methods are analyzed completely.The results are useful to the subgrade improvement for the speed-raising at existing-railway.