Study On Infiltration Characteristics And Soil - Water Characteristics Of Yunnan Red

This paper analyzes and summarizes the characteristics of soil infiltration, soil-water interaction characteristics, based on the wet and dry seasons Yunnan for climate characteristics, using laboratory experiments combination of theoretical research methods to study the Yunnan laterite infiltration problems. By variable head permeability test and water infiltration test, consider infiltration time, initial water content, dry density and other factors, to study the infiltration characteristics of Yunnan laterite under different factors; by soil-water characteristic test and direct shear tests considering factors dry density, the rate of sand, wet and dry cycles, etc., under different factors Yunnan laterite soil-water characteristics; based on infiltration properties and Yunnan laterite soil-water interaction characteristics, research into the Green-Apmt permeability applicability of Yunnan laterite y. Depth study of the results for the infiltration characteristics of Yunnan laterite soil and under wet and dry cycles-water interaction characteristics play an important role.Variable head permeability and water infiltration test results showed that:with the increase of infiltration time, Yunnan laterite hydraulic conductivity, surface infiltration rate decreases, the amount of cumulative infiltration, wetting front advance distance increases; with the initial moisture content increases, Yunnan laterite hydraulic conductivity, surface infiltration rate and cumulative infiltration is reduced, wetting front advance distance increases; with dry density increases, Yunnan laterite hydraulic conductivity, surface infiltration rate, cumulative infiltration, wetting front advance distance decreases.Soil-water characteristics and direct shear test results showed that:low moisture content, Yunnan laterite more sensitive to the variation of suction dry density. Overall, with the dry density increases, Yunnan laterite matric suction increases; with the increase of the rate of sand, Yunnan laterite matric suction decreases; matrix laterite dehumidifying process is greater than the absorbent matrix suction process suction; with the increase of matric suction, shear strength Yunnan laterite increases, affecting the rate of sand, wet and dry cycles, dry density and other factors on laterite matric suction and shear strength of the relationship between Yunnan curve is not obvious. Yunnan laterite soil-water effect relationship should be the role of physical, chemical and mechanical action described in terms of the role of three.Green-Ampt infiltration model study showed:Green-Ampt infiltration model based on cumulative infiltration and infiltration by fitting the time water infiltration test laterite give the laterite-based Green-Ampt infiltration model infiltration empirical formula. Verify show:Clay infiltration empirical formula as a whole has a certain accuracy, but at a lower calculation of large water content and dry density greater accuracy than dry density, low moisture content is small.Study on Green-Ampt infiltration model for layered soil showed that:consider the characteristics of layered soil, the two layers of soil, for example, established and solved Green-Ampt infiltration model layered soil. Yunnan to carry out infiltration layered laterite trials to test the applicability of layered laterite Green-Ampt infiltration model. The results showed that:layered soil Green-Ampt infiltration model is better than a single layer of soil (ie, the original Green-Ampt model) model in the calculation of layered soil infiltration aspect, but layered soil Green-Ampt infiltration model calculated value representing Found value is small, and in the calculation of the upper hydraulic conductivity smaller than the lower accuracy is higher than the upper layered soil hydraulic conductivity larger lower layered soil.