含盐量对固化硫酸盐渍土抗压强度的影响

来源期刊:中南大学学报(自然科学版)2018年第3期

论文作者:王生新 吕擎峰 贾梦雪 周刚 王庆栋

文章页码:718 - 725

关键词:硫酸盐渍土;固化机理;含盐量;抗压强度

Key words:sulphate saline soil; solidification mechanism; salt content; compressive strength

摘    要:对石灰粉煤灰固化不同含盐量硫酸盐渍土28 d试件进行无侧限抗压强度试验,探讨含盐量对石灰粉煤灰固化土抗压强度的影响。并采用界限含水率试验、X线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)和物理吸附试验等方法研究石灰粉煤灰固化不同含盐量硫酸盐渍土的稠度特征、物相特征、化学成分和微观结构,分析含盐量对石灰粉煤灰固化硫酸盐渍土抗压强度影响的机理。研究结果表明:含盐量在0.3%~5.0%范围内,不同石灰粉煤灰固化硫酸盐渍土的强度随含盐量的增加先增大后减小,峰值强度对应的含盐量为1.8%;同一含盐量时,当含盐量低于2.8%时,固化土强度随石灰粉煤灰含量的增加先增大后减小,当含盐量高于2.8%时,固化土强度随石灰粉煤灰含量的增加而增大。

Abstract: To discuss the effect of salt content on compressive strength, the unconfined compressive strength test for sulphate saline soil solidified by lime and flyash was performed after curing 28 d. Also, limit moisture content, X-ray diffraction (XRD), Fourier transform infrared (FTIR) and physical adsorption tests were carried out to reaearch the consistency characteristics, phase characteristics, chemical composition and microstructure of the sulphate saline soil with different salt contents solidified by lime and flyash and analyze the mechanism of the effect of salt contents on compressive strength. The results indicate that the strength of solidified sulphate saline soil with different content of lime and flyash increases firstly and then decreases with the increase of salt contents within the scope of 0.3%-5.0% , and peak strength corresponds to the salt content of 1.8%. Under the condition of the same salt content, the strength of solidified soil increases firstly and then decreases with the increase of the content of lime and flyash when the salt content is lower than 2.8%, but the strength of solidified soil increases with the increase of the content of lime and flyash when the salt content is higher than 2.8%.

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