Successful mitigations of riverbank slope stabilizations and road failures caused by excessive rainfalls due to climate change at national road 1B (NR 1B) in Laos PDR

Abstract

The sites of the successful road embankment and pavement repairs were located in Laos PDR at National Road 1B (NR 1B). National Road (NR) 1B connects Laos to China. Illustrations of the road embankment and pavement failures and their successful mitigations are discussed. The mitigations of the first case (Case 1) consist of PEC-150 geotextile reinforcements with gabions and wrapped around soil bag facing combined with intercepting trench drains wrapped around with TS-50 geotextiles. In the second case (Case 2), the proposed pavement repairs consisted of intercepting trench drains wrapped around with TS-50 geotextiles combined with PEC-150 geotextile reinforcements of the gravel sub-base replacing the upper portions of the embankments underlying the pavements. The intercepted subsurface seepage lowered the water table and collected and safely directed the seepage flow to drainage pipes and channels.