不同类型表面活性剂对粉质粘土抗剪强度和塑性的影响

INFLUENCE OF DIFFERENT TYPES OF SURFACTANT ON STRENGTH AND PLASTICITY OF SILT CLAY

选用不同浓度的阴离子、非离子表面活性剂作为目标污染物,以粉质粘土作为污染对象,对污染后的粉质粘土进行常规三轴不排水抗剪强度和液、塑限指标试验,结果表明非离子和阴离子表面活性剂对粉质粘土强度及塑性有明显弱化作用,粘聚力和摩擦角都有所降低,对粘聚力的影响大于对摩擦角的影响,且非离子表面活性剂的作用效果更明显,工程实践中应加以重视并根据污染物浓度及种类对相关力学参数进行修正。

Silt clay with different concentrations and types of surfactants have been investigated in this paper. Shear strength test and plastic index test of the polluted silt clay are conducted to research the influence of different types surfactants on the strength and plasticity characteristics of silt clay. It has been proved that the non-ionic surfactant and anionic surfactant can weaken the silt clay, cohesion and friction angle are decreased. The impact on the cohesion is greater than the effect on friction angle. The effects of nonionic surfactant is more obvious. Thus revise the mechanical parameters of silt clay is needed according to the surfactant concentration and types.