矿物掺合料影响粉质砂土地基无侧限抗压强度的试验研究*

通过无侧限抗压强度试验,系统研究石灰、粉煤灰以及水泥单掺、双掺、三掺对粉质砂土7 d无侧限抗压强度的影响。试验结果表明:单掺水泥加固粉质砂土的效果优于单掺石灰的加固效果;双掺石灰、粉煤灰加固粉质砂土的效果优于双掺水泥、粉煤灰和双掺水泥、石灰的加固效果,双掺石灰和粉煤灰加固粉质砂土的最佳配比为石灰掺量大于6%,且粉煤灰掺量为石灰掺量的3倍;石灰、粉煤灰和水泥混掺加固粉质砂土7 d无侧限抗压强度与双掺的强度接近。

Experimental study of silty sand foundation of no lateral restraint compressive strength with the effect of mineral admixtures

Through the strength test without lateral restraint pressure, the effect of lime, fly ash and cement with different ways including only one mineral, two minerals and three minerals mixed in silty sand to the no lateral restraint compressive strength of silty sand is carried out comprehensively. The experimental results show: When one mineral admixture is used to reinforce silty sand soil, the effect of reinforcement of mixing cement is better than that of reinforcement of mixing lime;When two mineral admixtures are used to reinforce silty sand soil, the effect of reinforcement of mixing lime and fly ash is better than that of reinforcement of mixing lime and cement, or cement and fly ash, and mixing lime and fly ash into silty sand soil with lime content more than equal to 6%, and the fly ash content for lime three times is determined to be the optimal mix;There is almost no difference between the reinforcement of mixing two mineral admixtures and three mineral admixtures into silty sand soil.