摘要
针对滇中高液限土,对不同生石灰掺量的改良土进行了击实试验、CBR试验、回弹模量试验、收缩试验以及干湿循环试验。试验结果表明,加入生石灰可以显著增大高液限土的CBR值及回弹模量,并明显减小试样的膨胀系数及收缩系数,显著改善高液限土的性能,并且生石灰最优掺量为3%左右。高液限土在干湿循环作用下的性能迅速劣化,而加入生石灰改良后,在5个干湿循环周期后,改良土的性能不仅没有衰减,反而有一定的增强,生石灰对高液限土的长期性能改良效果显著。
Aiming at the high-liquid-limit soil in Central Yunnan,the compaction test,CBR test,resilient modulus test,shrinkage test and dry wet cycle test were carried out for the improved soil with different lime content.The test results show that the addition of quicklime can significantly increase the CBR value and resilient modulus of high liquid limit soil,and significantly reduce the expansion coefficient and shrinkage coefficient of samples,and significantly improve the performance of high liquid limit soil,and the optimal dosage of quicklime is about 3%.The performance of high-liquid-limit soil deteriorates rapidly under the action of drying and wetting cycles.After adding quicklime,the performance of improved soil is not attenuated,but enhanced after five drying and wetting cycles.The long-term performance improvement effect of quicklime on high-liquid-limit soil is significant.
作者
杨元周
杨乾伟
郭彪
Yang Yuanzhou;Yang Qianwei;Guo Biao(Chongqing Survey Institute,Chongqing 40002,China)
出处
《城市勘测》
2022年第2期194-198,共5页
Urban Geotechnical Investigation & Surveying
关键词
高液限土
生石灰
长期性能
high-liquid-limit soil
quicklime
long-term performance
