粉煤灰-脱硫石膏混合体淋滤后抗剪性能试验研究

Experimental Studies of the Strength Variation of Mixture of Fly Ash and Gypsum After Leaching

为研究在有溶蚀作用发生的条件下,粉煤灰-脱硫石膏混合体作为灰坝坝基、路基材料的工程适用性,对五种不同比例的粉煤灰-脱硫石膏混合体试样进行淋滤,分析其淋滤前后抗剪强度变化规律。结果表明:未经淋滤时,混合体的内聚力c与内摩擦角φ随脱硫石膏掺量的增加呈先增后减的趋势,当石膏掺量为30%时,c、φ值最大;经淋滤后,各石膏掺量下的混合体强度均降低,且降幅随石膏掺量的增加而增大。故在无渗流作用发生或渗流作用微弱时,灰膏混合体可以更高的强度替代粉煤灰作为灰坝筑坝材料、路基材料或其他工程材料。

Research on the dissolution occurred under the condition of fly ash and gyp-sum mixture as the dam foundation and subgrade materialsused in engineering,five kinds of different proportions of fly ash and gypsum mixture samples were leached,the leaching analysis before and after the change of shear strength.The results show that the cohesion and angle of internal firstly increased and then decreased with increase of gypsum content;and the shear strength was higher when gypsum content was 30% before leaching.But the shear strength of the mixture with different gypsum content was lower after leaching.So the mixtures can be widely used in various engineering with higher shear strength than the fly ash.