With hydrochloric acid as the source of pollution, with laterite as the pollution soil, the shear strength and micro-structural characteristics of acid pollution laterite are studied by direct shear test. The results shown that, the shear strength and microstructure characteristics of acid pollution laterite are affected acid concentration and pollution time. The shear strength and indexes of acid pollution laterite decrease in general with the increase of acid concentration and the extension of the specimen pollution time, the shear strength and indexes exist a minimal value at lower concentration and shorter pollution time, the shear strength and indexes exist a great value at higher concentration and longer pollution time, the corresponding microstructure images present to the characteristics of compactness, roughness, color, texture.
The laboratory landslide test device of three part constituting by the model slotk and the catchment sink and rainfall system is developed according to test requirements, and it carried out to research calibration test of rainfall and correction of rainfall for rainfall systems under laboratory conditions. The calibration results of rainfall shown that the indoor rainfall increases linearly with time if the opening of the water-tap is reasonably controlled and that can ensure stability of the supplying water of the laboratory landslide test. The correction results of rainfall shown that, according to the energy balance method and volume method, the indoor rainfall can be converted the actual rainfall by the energy reduced coefficient in the indoor rainfall conditions and the actual rainfall conditions of the slope, and that ensure requirements of rainfall of laboratory landslide tests corresponding to the actual rainfall.The energy reduced coefficient is determined by landing speed of indoor raindrop and end speed of actual raindrop.
s. The microstructure characteristic of compacted laterite with acid contamination was researched by means of electronic microscope scanning and microstructures image analysis in which the hydrochloric acid was used as pollutant and the acid concentration and curing history of samples were taken into account. It shows that acid pollution significantly influences the microstructure of laterite in which with more acid concentration and longer pollution times, the microstructure images behave lower compaction, blur particle edges, dissolution cement among particles, gluing coatings parceling particles, pores among particles and darker gray color. The corresponding parameters of the microstructure behave different properties in which with longer pollution times of samples, there is a maximum of porosity, girths of particles increase, number of particles decreases, the circularity of particles is not obvious, the directionality and the fractal dimension vary with magnification of the images and with more acid concentration, the girths and porosity increase, the circularity and fractal dimension decrease, the particle number and the directionality vary with the magnification of images. The result shows that the mechanism of the effect of acid contamination on laterites micro structures is that the acid erodes its particles and the cement among particles.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.