高炉渣改良混合料抗剪强度特性大型直剪试验研究

Large-scale Direct Shear Test of Shear Strength Characteristics of Blast Furnace Slag Modified Mixture

以高炉渣混合料为改良研究对象,通过室内大型直剪试验,研究含砂率对高炉渣混合料剪力-位移曲线和抗剪强度的影响规律,以便将高炉渣应用在地基处理领域。试验结果表明,含砂率对高炉渣混合料的强度和变形特性具有重要影响:随着含砂率的增加,混合料的抗剪强度逐渐增大,抗剪强度在含砂率为23.79%时达到最大值,随后抗剪强度迅速下降;含砂率对粘聚力的影响先增加后逐渐下降,而含砂率对内摩擦角的影响相对较小。将混合料的含砂率控制在23.79%,可以使改良效果最佳。

Blast furnace slag is accumulated as waste of smelting metal around steel mills.It occupies land resources and pollutes the adjacent environment.This paper presents a large scale directing program on the blast furnace slag samples in order to apply these waste materials in the soil improvement projects.The impact of sand content in slags on the shear strength of the mixtures were thoroughly investigated.The results indicate that,the shear strength of slag-sand mixture increases with the sand content to a maximum value at sand content of 23.79%.After this sand content,the shear strength decreases rapidly with the increase of the sand content.The sand content has larger influence on the apparent cohesion,which increases with sand content to a maximum value and then decreases with the sand content,whereas,the sand content has less impact on the internal friction angle of the slag-sand mixtures.From the engineering point of view,the sand content should be controlled to be under23.79% when the slag-sand mixtures are used in the soil improvement projects.