膨胀土判别分类及其石灰改性

Distinction and Categorization of Expansive Soil,and Its Modification by Blending Lime

膨胀土对建筑设施的安全有很大影响,通过对国内外多种膨胀土判别与分类方法的评判指标进行综合统计,结合当地经验和工程实际情况,提出了膨胀土膨胀潜势等级判定标准。利用石灰对膨胀土改性最重要的是寻求石灰的最佳掺和比,先后进行了4%、6%、8%、5%不同石灰掺和比的试验,现场试验表明,在石灰掺量为5%时,经改性的各层土均属非膨胀土,改性效果显著。

Expansive soil has great effects on architectures and facilities.On the basis of synthetic statistics of assessment indexes of expansive soil distinction and categorization methods used at home and abroad combined with local experiences and practical projects,the paper puts forward the grade assess-ment standard on expansive potential of expansive soil.The most important thing for modification of ex-pansive soil using lime is to seek for the optimum blending ratio.The tests with different blending ratios of lime of4%?6%?8%?5%were conducted.The field tests showed that the soils at all layers became non-expansive after modification with blending ratios of lime of5%.The effectiveness of modification is significant.