Roadbed reinforcing method

The invention provides a roadbed reinforcing method. The roadbed reinforcing method comprises the steps that screen tubes are driven into a preset area from one side of a roadbed along a preset path;grouting pipes stretch into first positions in the screen pipes, and grouting is carried out at first grouting pressure; and the grouting pipes stretch into second positions in the screen pipes, and grouting is carried out at second grouting pressure, wherein the distance from the first positions to the side of the roadbed is larger than the distance from the second positions to the side of the roadbed. According to the roadbed reinforcing method, segmented grouting from inside to outside can be achieved, and different grouting pressures can be adopted for grouting in different areas so that the grouting amounts corresponding to the requirements of the different areas can be obtained in the different areas, the situation that rod ballasts are hardened due to the fact that a large amount ofslurry flows into areas w