Abstract:

In order to explore drainage effect of desilting soil on the Yellow River dike，three drainage measures including horizontal blind ditches, geotechnical mesh drainage cushions，and horizontal and vertical infiltration PVC drainage pipes, are tested in the Dongming section of the Yellow River embankment in Shandong province. Relationships between groundwater level and time are obtained through measuring groundwater levels of observation point in the deposition zone. The test results show that drainage measures can speed up the soil consolidation of the Yellow River dike by desilting; but effects of drainage are related to drainage measures. The difference of drainage effects of the earthwork mesh drainage cushions and blind ditches are not obvious; and it is related to thickness of soil layer. The drainage effect is very good when setting up a drainage layout such as blind ditch drainages or earthwork mesh drainage cushions with about every 3 m thickness dike by desilting, but drainage effect is bad if desilting soil thickness increases. With the thickness increment, the collapse of transverse dikes can not be prevented by the two types of drainage methods. Horizontal and vertical seepage drainage pipe program has the best effect of these methods，especially for the establishment of the vertical PVC pipes; and the collapse of transverse dikes can be effectively prevented. The test results provide reference for design and construction for speeding up drainage rate of the Yellow River dikes.

Key words: Yellow River dike, dike body reinforced by desilting, drainage effect, experiment