The Pollution Of Acid Clay Macro To Micro Characteristics Of The Study

Based on the comprehensive analysis on pollution at home and abroad of the physical and mechanical properties of laterite, the microstructure characteristics, landslide model test, such as corrosion mechanism on the basis of study, made clear the acid pollution problems in the research of the laterite, and put forward the "acid pollution of laterite macro and micro characteristics and corrosion mechanism research" the subject. For the typical yunnan laterite, choose hydrochloric acid as pollution, laterite for acid pollution in a series of research. The research content mainly includes acid pollution laterite, microstructure characteristic of physics and mechanics characteristic research, landslide model of comparative analysis and acid pollution of laterite, the corrosion mechanism is discussed. Through the acid pollution of the physical and mechanical properties of laterite test, clear the acid pollution laterite court of the physical and mechanical properties with acid concentration and maintenance the change of time; Through the microstructure characteristics research and image processing techniques, the acid extraction analysis of the microstructure characteristic parameters on laterite pollution; Or an acid pollution for the typical of the landslide in yunnan laterite indoor test model in the contrast test; Combined with acid pollution laterite, microstructure characteristic of physics and mechanics characteristic and the characteristic parameters, from the point of view of the chemical reaction illustrates the acid pollution, the corrosion mechanism of laterite.The particle analysis acid pollution laterite, the proportion of laterite, liquid and plastic limit and compaction, the shear strength and the compression, and other physical and mechanical properties of the samples is changed by acid concentration and curing time two parameters, through the acid pollution of laterite particle analysis, specific gravity, boundaries compaction, moisture content and the shear strength and the compression and macro test to determine the comparative analysis. The results show that:without dispersing agent and salt-leaching, the silt content decreases with lower acid concentration but increases with higher acid concentration; With extended curing time, the silt content decreases with lower acid concentration, but decreases, then increases with higher acid concentration; Silt content decrease after salt-leaching, but increases without dispersing agent. The specific gravity, liquid limit and plastic limit, plasticity index of acid pollution laterite decrease with accrescent acid concentration and extended curing time. Acid pollution of laterite maximum dry density decreased, the optimal overall moisture content is reduced, shear strength and shear strength parameters reduced. With the increase of the concentration of the acid and curing the extension of time, the shear strength and compression coefficient is first decreases, and then have rebounded, and then reduce the trend. And the influence of the acid concentration sample to a greater extent than curing time acid pollution laterite the influence degree of each mechanical properties.The microstructure of the laterite acid pollution features of different scanning electron microscope (SEM) through acid concentration, different curing time, shear front and under different conditions such as before and after compression for different image magnification of microstructure refining comparison and analysis, and the acid pollution the microstructure of the laterite was digitized image. The results show that: the void ratio of the laterite pollution is larged than pure laterite, before and after shear or compression, along with the increase of the concentration of the acid and the extension of curing time, the void ratio show increases, decreases, and the tendency of increase again.Through to the acid pollution laterite experiment of indoor landslide model, made clear the acid on laterite the effect on the stability of the slope. Slope size and dry density in the same condition, the pollution of the laterite in landslide slope after the rain no pollution to much less than the laterite of slope, apparent contrast.Acid pollution laterite physical and mechanical characteristics is changed with the microstructure, and the microstructure is changed by the interaction between the particles. Combined acid pollution laterite microstructure characteristic, physics and mechanics characteristics and characteristic parameters, through the hydrochloric acid corrosion process of laterite reflect the corrosion stage, salt and dissolve stage stage, from the point of view of the chemical reaction to explain the hydrochloric acid pollution, the corrosion mechanism of laterite.The changes of physical and mechanics characteristics about acid pollution laterite is the combined result of corrosion stage, salt-forming stage and dissolution stage.