石灰改良膨胀土填料试验研究  

Experimental Study on Admixture of Lime-Treated Expansive Soil

作　　者：刘晓义[1] 杨有海[1] 

机构地区：[1]兰州交通大学土木工程学院,兰州730070

出　　处：《铁道标准设计》2012年第1期20-23,共4页Railway Standard Design

摘　　要：以实际工程为依托,通过室内试验,对石灰改良膨胀土的物理性质、胀缩性、强度特性、水稳定性进行了研究.研究结果表明:石灰改良土的塑性指数降低,胀缩性减弱；石灰改良土的抗剪强度与掺和比、养护龄期和压实系数均呈正相关性,石灰改良土的最佳掺和比为5％ ～7％,60 d龄期之后石灰改良土的抗剪强度仍有很大的增长趋势；石灰改良土水稳定指标在0.70以上,具有很好的水稳定性；基于试验分析得出了石灰改良膨胀土具有很好的改良效果.Relying on the actual railway project in a test section,the physical properties,swell-shrinking properties,intensity behaviors and water stability of lime-treated expansive soil are studied.The results show that the plastic index and the swell-shrinking properties of lime-treated expansive soil were decreased obviously;the shear strength of lime-treated expansive soil was positive correlation to the lime content,curing age and compaction coefficient;the optimal lime content was 5% to 7%,and still had a great increase after 60 days;and it possessed favorable water stability and its water stability index was greater than 0.7.According to the experimental analysis,the paper puts forward that expansive soil treated by lime can get pretty good improvement effects.

关 键 词：铁路路基 膨胀土 抗剪强度 水稳定性 

分 类 号：U213.1+4[交通运输工程—道路与铁道工程]