Abstract
Particle size exerts a significant influence on the mechanical behavior of soil. However, insufficient research has been carried out on red clay formations, which are widespread in some Chinese provinces. Here, using unconfined compressive strength (UCS) tests, wetting–drying (WD) tests, and low-temperature nitrogen adsorption tests, we examined the relationship between the particle size and a number of mechanical and microstructural characteristics of a red clay outcropping at a construction site in China. Our results suggest that, depending on the surface area, porosity, particle size, and dry density, the failure mechanism in UCS tests will be different. That is, as the particle size increases, the failure mode of soil changes from split failure into shear failure. In addition, as the dry density increases, the UCS of the soil sample is significantly improved, and its total porosity and fractal dimension decrease. We also evaluated a dependence on particle size and the number of WD cycles on the distribution and size of cracks in WD tests. We conclude by suggesting that particle size, dry density, and WD behavior should all be taken into account in roadbed designs in red clay formations.
Highlights
IntroductionRed clay is a shared, but problematic soil characterized by a high liquid limit (LL)
6, it isevident evidentcracks that on thethe adsorption andsample desorption apparent shear failure, there surface of the soil and cumulative pore volume of the red clay gradually decreases with the increase the pore split failure on the other side
In this paper, red clay from Guilin of various particle sizes and dry densities were subjected to low-temperature nitrogen adsorption tests, unconfined compressive strength (UCS) tests, and WD cycle crack subjected to tests low-temperature nitrogen adsorption tests, and WD cycle crack quantitative to study the effects of particle size tests, on theUCS
Summary
Red clay is a shared, but problematic soil characterized by a high liquid limit (LL). Plasticity index (PI) and usually presents a high natural moisture content (NMC). It is generally distributed in the hot and humid regions of South China [1,2,3]. With the development of the economy, an increasing number of railways and roads pass through this particular soil area. If red clay is widely used in roadbeds as filler, it will inevitably lead to road cracks, uneven road surface settlement, and other engineering problems, which will further cause damages to the roads. Specialized treatments are required for red clay to be exploited in embankments
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