干湿效应作用下改良红粘土路基长期性能试验研究  

Experimental Study on Long Term Performance of Improved Red Clay Embankment under the Action of Dry and Wet Effect

作　　者：郭彪 李亚军 叶咸 陈贺 

机构地区：[1]云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室,云南昆明650041

出　　处：《公路工程》2017年第5期273-277,288,共6页Highway Engineering

基　　金：基金项目云交科2015(A)12

摘　　要：为了研究改良红粘土路基的长期性能,对素红粘土、机制砂改良红粘土(掺砂比40%)、生石灰改良红粘土(掺灰比4%)3种情况分别进行了0、1、3、5次干湿循环试验研究,得到了试样CBR值与干湿循环次数的关系。试验结果表明,素红粘土的长期性能对环境中的湿度变化十分敏感,随着干湿循环次数增加,素红粘土试样CBR值呈现逐渐衰减趋势,5个干湿循环周期后,CBR衰减幅度达到40%;机制砂对红粘土的长期性能略有改善,但机制砂改良红粘土对环境中的湿度变化仍然比较敏感,5个干湿循环周期后,CBR值衰减幅度约为20%;生石灰对红粘土的长期性能稳定改善效果显著,生石灰改良红粘土对环境中的湿度变化不敏感,随着干湿循环次数增加,生石灰改良红粘土试样CBR值呈现不降反升的趋势,5个干湿循环周期后CBR上升幅度高达78%。In order to study the long terim performance of the improved CBR values of the red clay , the red clayimproved by 40% manufactured sand and the red clay improvedby 4% quicklime were testedunder 0,1 , 3 , 5 times of wet and dry cycles , andthethe CBR values and the number of wet and dry cycles w a s obtained. T h e test results show thatthe long-term performance of red clay is very sensitive to humidity changes in the environment , the C B R value of red clay samples decreasegradually while the number of cycles increased , cycles , the CBR atenuation rate reaches 40% ; T h e long-term pee＇ormance of improvedred clay by m a n u -factured sand is still sensitive to humidity changes in the environment , after 5 cycles cles ,the CBR attenuation rate reaches 20% ; H o w e v e r , the effect of quicklime on the long-term stabilityof red clay is significant , the long-term performance of improvedred clay by quicklimeis not sensitive tohumidity changes in the environment , instead of decreasing , the C B R value increanumber of cycles increased , after 5 cycles of wet and dry cycles , the CBR vthe value of sample without wet and dry cycle.

关 键 词：红粘土 机制砂 生石灰 值 干湿循环 

分 类 号：U416.16[交通运输工程—道路与铁道工程]