| 摘要 |
A method for inhibiting roadbed erosion and damage to roadways utilizes an underdrain system for removing water which causes such damage. Underdrains in the form of perforate pipes, preferably covered with a geotextile sock as a filter, are disposed transversely to the lenthwise direction of the roadway in close proximity to faults, cracks, joints and other fissures in the roadway. The underdrains conduct water away from such fissures thereby preventing roadbed particulate material from being pumped upwardly through the fissures together with water which collects below the concrete roadway. Such an installation is highly useful for preventing further damage to existing roadways, and may be installed without interrupting traffic or destroying the road surface by means of a pneumatic underground piercing tool. |
