Due to main geomorphological characters, in many Italian Regions hillside roads often suffer of slips settlements due to weak soil properties of superficial altered soils and unfavorable local pore water pressure conditions. Traditional stabilization works, such as retaining walls or piles associated with drains are difficult to make, too expensive related to the actual stability problem and implicate car traffic limitations for a long period. The paper presents a case study regarding the stabilization works of a hillside road slip on National Italian Road in central Italy based on the application of the soil mixing method to improve the road stability. The solution was relatively simple and fast with a short and only partial traffic interruption. Slope stability analyses and an original and specifically made quality control procedure are presented too.
Subjects: Ground improvement, soil mixing, road slip repair
Author: Massimo Grisolia, Ignazio P. Marzano, Giuseppe Iorio, Raffaele Papa and Giuseppe Panetta
Publisher: DFI, EFFC