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选择钙质紫色土和中性紫色土为工程试样,通过室内多级三轴剪切试验测定了含水率和干密度交互作用对土坎稳定性重要指标——土壤抗剪强度指标的影响,确定了紫色土土坎坎高及外边坡稳定角的取值,以优化土坎设计.结果表明:干密度和含水率交互作用对土壤粘聚力的影响下,钙质紫色土和中性紫色土土坎土质的最优含水率分别为11%,8%,最优干密度分别为1.7,1.68g/cm3;在紫色土最优干密度和含水率下,考虑占地和稳定性因素,钙质紫色土土坎高度不宜超过2.0m,其外边坡坡度角可设计为80°;中性紫色土土坎高度不宜超过1.5m,其外边坡坡度角可设计为60°.本文旨在为紫色土区国土整治土坎修筑工程提供理论指导.
Calcareous purple soil and neutral purple soil were selected as engineering samples. Through the multi-stage triaxial shear test in laboratory, the influence of the interaction between water content and dry density on the index of soil stability, which is the important index of soil stability, The values of the ridge height of the purple soil and the stability angle of the outer slope were determined to optimize the ridge design.The results showed that under the influence of the interaction of dry density and water content on the cohesion of soil, calcareous purple soil and neutral purple The optimal soil moisture content of soil is 11% and 8%, respectively, and the optimal dry density is 1.7 and 1.68g / cm3, respectively. Under the optimal dry density and moisture content of purple soil, considering the land occupation and stability, The height of calcareous purple soil ridge should not exceed 2.0m, and the slope angle of its outer slope can be designed as 80 °. The height of neutral purple soil ridge should not exceed 1.5m, and the slope angle of its outer slope can be designed as 60 °. Purple soil area ridge construction project to provide theoretical guidance.