紫色土崩解特性对容重和含水率的响应特征

以紫色土为研究对象,通过室内重塑土试验,采用多元回归方程和曲面响应等分析方法,研究容重和含水率对紫色土崩解特性的影响。结果表明:(1)在相同容重下,崩解量随着含水率的增加而减小,不同含水率的土样崩解时间有所不同;土样完全崩解时间总体上随着含水率的增加而延长,且崩解量主要集中在崩解阶段前3 min。(2)在相同含水率下,崩解量随着容重的增加而减小,土样完全崩解时间总体上随容重的增大而延长,且崩解量主要集中在前4 min。(3)在相同容重和含水率下,土样崩解速率均随着容重和含水率的增大而减小;较之容重,含水率对崩解速率的影响较大。容重和含水率的交互作用对崩解速率影响显著,即随着容重和含水率的增加,土样崩解速率减小。研究成果为紫色土的侵蚀防治提供了参考。

Response Characteristics of Purple Soil Disintegrating Characteristics to Bulk Densities and Water Contents

In the present study, multiple regression equation and surface response analysis were used to investigate the effects of soil bulk densities and water contents on the amount and rates of disintegration in a purple soil. The results showed that:(1) Under the same bulk density, the amount of soil disintegration decreased with the increase of water contents, and the soil disintegration time varied with water contents. The total time of soil disintegration was extended with the increase of water contents, and the amount of soil disintegration was mainly concentrated in the first three minutes of the soil disintegration stage. (2) Under the same water content, the amount of soil disintegration decreased but the soil disintegration time increased with the increase of soil bulk densities, and the amount of disintegration was mainly concentrated in the first four minutes. (3) Under the same bulk density and water content, the soil disintegration rates decreased with the increase of soil bulk densities and water contents. Compared with bulk density, water content had a greater influence on the soil disintegration rates. The interaction of bulk density and water content had a significant effect on the soil disintegration rates, indicating that the soil disintegration rates decreased with the increase of bulk density and water content. Our findings provided some reference for controlling erosion of the purple soil.