Abstract
Nowadays, the increasing demand for road transport makes maintenance and repair of road infrastructures key tasks of road engineering. The current experimental work consists of laboratory model experiments to understand the conduct of sand as a subgrade under dynamic load and its effect on the flexible pavement and base layer. The reinforcement is applied at the interface between the base and subgrade using SS2 type of geogrid. The road layers are exposed to harmonic dynamic load with two load amplitudes of 10 and 15 kN and two frequencies of 0.5 and 1 Hz. The vertical stresses in the road layers are measured using stress a gauge sensor. In the case of a reinforcing geogrid in the middle of the base course, the stress decreases by increasing the frequency and load amplitudes by about (23-42(. The best position for geogrid is in the middle of the crushed stone layer because it gives the lower displacement. In the case of a reinforcing layer at the middle of the base course layer, the stress and vertical displacement decrease with increasing in frequency and load amplitudes. When laying the geogrid between the base course and subgrade, a lower decrease in the stress and vertical displacement could be obtained with the increase in frequency and loads.
Highlights
Dynamic axle loads have different effect other than their static values, i.e., those obtained with the vehicle stopped at a truck inspection station
The study results showed that the inclusion of reinforcement can substantially reduce the footing settlement and improve the soil’s bearing capacity
Stress Results for Unreinforced Models Figures 8to 11 present the stresses transmitted to the asphalt layer and underlying base and subgrade layers using 150 mm base course thickness with two load amplitudes: 10 and 15 kN and two frequencies 0.5 and 1 Hz
Summary
Dynamic axle loads have different effect other than their static values, i.e., those obtained with the vehicle stopped at a truck inspection station. The study results showed that the inclusion of reinforcement can substantially reduce the footing settlement and improve the soil’s bearing capacity. The main research objective is to measure the elastic deformation, stresses, and permanent deformations at variable depths Both physical and experimental mode results are close enough. Both stresses and elastic deformations were studied using different properties of the structure using algorithmic calculations. [7] have studied the structural response of geogrid reinforced asphalt overlays, their main focus on observing the strains within the asphalt layer. Final objective is to study the effect of different values and frequencies of dynamic load on induced strains and stresses between flexible pavement layers reinforced with geogrids
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