Abstract
According to the change characteristics of the subgrade moisture content and the mechanical calculation of several typical highways, the test scheme of the permanent deformation of coarse soil was formulated. The relationship between the permanent deformation of coarse-grained soil and the stress level, compaction degree, moisture content, and loading frequency was studied by cyclic loading triaxle testing. The results show that the permanent deformation of coarse-grained soil increases with the increase in partial stress and moisture content and decreases with the increase in compaction degree. The experimental data were fitted by the Tseng-Lytton model, and the correlation coefficients were 92%, which indicated that the model could be used to predict the permanent deformation of coarse soil. The relationships between the model coefficient and the moisture content and spring back modulus were obtained by the multiple regression method. Finally, the permanent deformation of the subgrade soil was calculated by using the layered summation method and a typical subgrade pavement structure.
Highlights
At present, research on the impact of vehicle loads on roads in China and abroad has focused on the road surface and not the roadbed, which is problematic [1,2,3]
When the American Highway Association of the State Highways (AASHO) conducted an experimental study of road ruts, it was found that 9% of road surface ruts were caused by roadbeds [4]
Elliot and ompson believed that the permanent deformation of subgrade soil had a significant impact on the performance of asphalt pavement, and they believed that road designers were less concerned with the deformation of subgrade [5]
Summary
Research on the impact of vehicle loads on roads in China and abroad has focused on the road surface and not the roadbed, which is problematic [1,2,3]. Coarse-grained soil is a soil-rock mixture with a particle size of more than 50% of the total mass in the particle size range of d 0.075 to 60 mm due to its high porosity, high water permeability, high shear strength, high bearing capacity, and good compactness. Such excellent engineering characteristics have been widely used in the construction of high embankments for highways in southern China. Is paper intends to analyze the stress status of the typical expressway subgrade in China and formulate a reasonable test program to study the load deformation characteristics of coarse-grained soil subgrade under different stress levels, confining pressures, loading times, compaction degrees, and moisture contents. The impact of vehicle load on Advances in Civil Engineering a coarse-grained soil embankment has rarely been studied. is paper intends to analyze the stress status of the typical expressway subgrade in China and formulate a reasonable test program to study the load deformation characteristics of coarse-grained soil subgrade under different stress levels, confining pressures, loading times, compaction degrees, and moisture contents. e research results can provide a theoretical basis for the remediation of road damages and provide corresponding guidance for traffic management
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