Abstract
This is the first study on “ribbed smoked sheets (RSS)” as a geogrid reinforcement in geotechnical engineering. An RSS is a kind of natural para rubber. RSS (grade 3) was designed as a biaxial geogrid with an aperture size of 20 mm × 20 mm and a spacing of 20 mm. The RSS was found to be a significant functional layer when applied to the subbase lateritic soil layer. The lateritic soil with an RSS reinforcing layer was greatly improved regarding the California bearing ratio (CBR). Numerical simulation using two-dimensional finite element software was used to determine the optimal number and positions of the RSS reinforcing layers in road embankment stabilization. The simulation data in terms of horizontal displacement of unreinforced road embankments was validated by the collected data from the actual construction site. The RSS reinforced layer was varied from one to three layers under 61 analysis conditions. The highest safety factor was obtained with two layers of RSS at 0.1H below the top of the road embankment and 0.4H below the first RSS layer, suggesting a suitable installation of the RSS reinforcing layer. The RSS is thus strongly recommended as a reinforcing material in low CBR lateritic soil for the road embankment.
Highlights
Academic Editor: LuísA road embankment, which is the soil layer, can withstand strong compression but the tension property is very weak
The reinforcement material, which is stiffer than the road material, has become one alternative to apply for increasing stability, bearing capacity, and strength of soil, especially in road construction [1,2]
The performance of Ribbedwith smoked sheet (RSS) with a geogrid function was evaluated in the laboratory by measuring the strength of the lateritic soil based on the California Bearing Ratio (CBR) test
Summary
A road embankment, which is the soil layer, can withstand strong compression but the tension property is very weak. Esmaeili et al [14] investigated the optimal position for geogrid reinforcement, which led to the best performance of the geogrid reinforcement by considering the maximum bearing capacity of the railway embankment; the optimized results were the normalized distances u/B = 0.3 and h/B = 0.4 with three layers of the geogrid reinforcement, based on B, u, and h being 4.8 m, 1.44 m, and 1.92 m, respectively. Four layers of the geogrid reinforcement did not increase the bearing capacity of the railway embankment. This research aimed to investigate the optimal layer and position of RSS reinforcement on the road embankment, which was located on soft ground areas based on safety analysis conducted using numerical simulation
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