Hybrid A-Frame Micropile/MSE Wall with Impact Barrier, Unique Design and Construction Approach

Well-designed impact road barriers and shoulder areas are critical components of protecting travelers from accidents on Colorado's mountain roadways. Many roads in the mountains were built on steep terrain by cutting existing rock material and filling at steep slopes with limited shoulder room. While MSE walls have been routinely used in Colorado, their effectiveness is not clear when they are placed on narrow steep cuts. Installation of micropiles in the form of A-Frames into MSE walls to provide lateral impact resistance has the potential to be a unique engineering solution for Colorado's mountain road barriers. This study will investigate the possibility of using an A-Frame micropile-MSE wall system as an effective alternative for mountainous roadway construction.