I am considering to have embankment layer 0f 30 cm and then a grave material (subbase layer) of 20 cm.It may isulate the water but the real problem will be from sides seepage which will undermine and damage the road
I am working in sudan and we plan to construct Gravel road in Malakal area through labor intensive techniques.The problem is that the subgrade in this area is black cotton soil .I wanted to know what techniques we can apply for compaction of this soil