摘要
膨胀土的改良是膨胀土路基工程研究领域中的重要问题之一,结合沪汉蓉通道武康二线襄胡段路基试验工程,分别以生石灰、水泥、粉煤灰以及二灰(粉煤灰—石灰)作为膨胀土的改良剂,通过室内基本试验研究,对各种改良膨胀土的胀缩性、强度特性、水稳定性、龄期效应和干湿循环下其强度变化规律进行了研究,对各种改良膨胀土的改良效果进行对比分析。试验研究表明:石灰可以显著减小膨胀土胀缩性;石灰改良膨胀土相对于其他改良膨胀土具有良好的强度特性、龄期效应和水稳定性,而且石灰改良膨胀土具有很好的抵抗干湿循环后强度减小的特性;水泥改良膨胀土也具有良好的强度特性,但水稳定性较弱;二灰改良膨胀土和粉煤灰改良膨胀土抵抗干湿循环的效果较弱。
Improvement of expansive soils is one of the important issues in the field of subgrade engineering.According to the subgrade test project on Xianyan-Hujiawan section of Wuhan-Ankang second line of Shanghai-Wuhan-Sichung passage,lime,cement,fly ash and fly ash-lime were adopted respectively as expansive soil improvers,and indoor basic experiments were carried out to study the expansion,contraction and strength characteristics,water stability,age effects and strength characteristics under dry-wet cycle variation for expansive soils.Results concluded： lime can significantly reduce the contraction and expansion of expansive soils;comparing with others,lime-treated expansive soil possesses better age effect and water stability,and lime-treated expansive soils possess good characteristics of strength reduction after dry-wet cycles;cement treated expansive soil has good strength characteristics but worse water stability;both lime and fly ash treated expensive soils are weak in resisting dry-wet cycles.
出处
《铁道标准设计》
北大核心
2011年第11期20-23,共4页
Railway Standard Design
关键词
铁路路基
膨胀土
路基填料
改良
Railway subgrade
Expansive soil
Subgrade filling
Improvement
