一、前言 隧道内整体道床,由于排水不畅,整体道床长期受地下水侵泡,加上列车振动,往往造成整体道床和基岩分离。随着运量增长和年限的延长,病害不断发展,列车通过时冒水冒泥浆,列车严重晃动。例如京原线横岭隧道,因病害严重,列车通过时下沉量达60mm,限速 I. INTRODUCTION As a result, the overall track bed in the tunnel has poor drainage. The whole track bed has been invaded by groundwater for a long time. Coupled with train vibration, the overall track bed and bedrock are often separated. With the increase in traffic volume and the extension of years, the disease continues to develop. When passing by the train, the train takes mud and the train is severely shaken. For example, the Beijing-Yuanjiang Heng ridge tunnel, due to serious disease, the train passed down when the amount of 60mm, speed limit