目前既有线路基的加固改造已成为提速战略中的重要内容,尤其是路基基床的加固更为重要,虽然已有的加固方法很多,但由于既有线必须正常运营的特殊条件,其工程的可行性成为解决问题的关键,作者针对一些常用的加固方法进行了比较分析,并引入一种新的具有可行性的处理方法———无砂混凝土碎石桩复合地基。 At present, the reinforcement of the existing railway line has become an important part of the speed-raising strategy. In particular, the reinforcement of the subgrade bed is more important. Although there are many existing reinforcement methods, due to the special conditions that the existing railway lines must be operated normally, the project is feasible Sex has become the key to solve the problem. The author makes a comparative analysis of some commonly used reinforcement methods and introduces a new feasible treatment method --- sandless concrete gravel pile composite foundation.