杜草隧道整体道床，自运营以来，线路质量均衡稳定，提高了轨道质量，改善了工人劳动条件，减少养护维修工作量及费用．但近几年来，由于整体道床施工质量、地质不良和地下水的作用，造成整体道床翻浆、下沉，难以维持列车正常速度运行，给运输安全带来隐患，引起上级主管部门 Ducao tunnel overall track bed, since the operation, the line quality and stability, improve the quality of the track, improving the working conditions of workers and reduce maintenance and repair workload and costs. However, in recent years, due to the overall quality of track bed construction, poor geological conditions and the role of groundwater, the entire ballast bed is splashed and sunk, making it difficult to maintain the normal train speed and bring hidden dangers to transport safety, causing the higher authorities