陇南地区弱膨胀土膨胀性分级标准研究

The swelling classification standard for the weak expansive soil in Longnan Area

通过对膨胀土膨胀性分级指标的分析,选择自由膨胀率、胀缩总率、塑性指数和小于0.002mm颗粒质量分数等作为陇南地区膨胀土判别膨胀性的指标;并利用这4项指标将弱膨胀土的膨胀性细化为强弱膨胀土、中弱膨胀土和微弱膨胀土,得出弱膨胀土分类标准;通过Bayes判别法对甘肃陇南地区弱膨胀土分类标准进行判别,并与膨胀土实际膨胀性进行对比,结果表明评判效果较好。

The free expansive ratio,total rate of swelling-shrinkage,plasticity index and content of less than 0.002 mm particles were chosen as the swelling classification index for Longnan area.The weak expansive soil was further classified as strong weak expansive soil,medium weak expansive soil and little weak expansive soil by using the four indicators.The weak expansive soil classification standard was concluded.The weak expansive soil classification standard was verified in Longnan area by Bayes mathematical statistics method by comparing with the actual swelling,which turned out to be reasonable.