渠道边坡稳定的盐敏感性特征研究

工程中灌排渠道在运行多年后，随着土中含盐量的增加，会造成渠道边坡不同程度的滑塌、变形及结构的破坏。通过对盐化土的剪切试验和界限含水率试验，得到不同含盐量下土的抗剪强度指标和稠度界限，运用单因素试验分析含盐量对土的抗剪强度和稠度界限的影响规律。随着含盐量的增加，土体的团聚体稳定性降低，增加了粘粒的分散性，土的抗剪强度有所下降；同时土的稠度界限也会降低，增大了土的流动性，明确地说明含盐量增加也是影响灌排渠道边坡稳定性重要因素。

The Characteristic Research on Salt Sensitivity to Stability of Canal Side Slope

With salt content increases in the soil of irrigation and drainage canal after running many years, different degree of collapse, deformation and structural destruction happen to side slope of canal. Through direct shear test and limit moisture content test of saline soil, the sheer resistance strength and consistency limit are determined for different salt content. Applying single factor test, the influences of salt content on shear strength and consistency limit are analyze. With the increase of salt content, the aggregate stability decreases, the clay dispersion increases, and shear resistance strength decreases; there is a declining trend in the earth consistency limit, which means increase in the fluidity of the soil. This clearly implies that salt content increase is one of the key factors which influence stability of side slope of irrigation and drainage canal.