非饱和红粘土和膨胀土抗剪强度的比较研究

Comparative study on shear strength of unsaturated red clay and expansive soils

红粘土是对环境湿热变化敏感的塑性粘土,具有一般膨胀土吸水膨胀失水收缩的特性。与普通粘性土相比,红粘土与膨胀土的强度特性更为复杂。它既是土体抵抗剪切破坏能力的表征,也是计算路堑、渠道、路堤、土坝等斜坡稳定性以及支挡构筑物土压力的重要参数。通过试验研究讨论了红粘土与膨胀土的强度特性以及与一般粘性土的差别及其各种影响因素,并探讨了非饱和红粘土与膨胀土的抗剪强度指标与含水量之间的相关关系。试验结果表明,红粘土与一般膨胀土的吸水膨胀规律完全相同。其试验结果可为红粘土与膨胀土地区工程设计与建设提供参考依据。

Red clay is of swelling properties in a similar way to expansive soils. Compared with common clayey soils, the strength behavior of red clay and expansive soils are more complicated. Strength of red clay and expansive soils, as the standard of shear resistance, is an important parameter used in evaluating stability of embankment slopes such canal, roadbed and earth dam. Many failure records of earth constructions due to red clay and expansive soil slopes and foundations require a definite understanding of strength of red clay and expansive soils. The strength characteristics of unsaturated red clay and expansive soils have been studied experimentally. The main features and influencing factors of strength behavior of red clay and expansive soils which are different from those of common clayey soils are discussed. The interrelationships between the shear strength parameters and water content of red clay and expansive soils are established on the basis of experimental data.