摘要
为研究工程应用中石灰掺量的增加对于膨胀土膨胀变形量的影响,采用"二次掺灰"法,进行了掺量为0%、2%生石灰、2%生石灰+2%消石灰、2%生石灰+4%消石灰四种不同掺灰方法下膨胀土的自由膨胀率及干湿循环变形试验。试验结果显示,在石灰增量相同(2%)的基础上,土体膨胀变形量的变化不同,仅掺加2%生石灰对土体的膨胀变形影响不明显,当继续掺加2%的消石灰时,土体的膨胀变形量出现了明显的减小,在此基础上继续掺加2%的消石灰时,土体的膨胀变形减小,但减小的幅度明显变小。干湿循环试验结果显示,经过石灰改良后的膨胀土,在一定的干湿循环次数下仍然出现了膨胀变形现象。
In order to study the increasing lime-content effect on expansive deformation of expansive soil in engineering application,the tests for free swelling ratio and linear expansive ratio with the lime content of 0% and 2% quick lime,with 2% quick lime+2% slack lime,and with 2% quick lime+4% slack lime are carried out. The test results show that it has different expansive deformation under same lime content increment,and the effect of expansive deformation with only mixed 2% quick lime is not obviously. When2% slack lime is added continuously,the expansive deformation of the soil decreases obviously,and based on the condition when adding 2% slack lime content continuously,the expansive deformation decreases but the extent of reduction is obvious small. The results from the dry-wet cycle tests show that the expansive soil treated by using lime still appears the expansive deformation under certain number of dry-wet cycles.
作者
边加敏
Bian Jiamin(Luqiao and Ganghang Enginring Department,College of Nanjing Communication Institution,Nanjing 211188,China)
出处
《工程勘察》
2020年第8期12-17,共6页
Geotechnical Investigation & Surveying
基金
江苏省教育厅高校自然科学研究基金项目(17KJB170008)
南京交通职业技术学院课题项目(JZ1803)
江苏省高校“青蓝工程”中青年学术带头人项目。
关键词
“二次掺灰”法
石灰改良膨胀土
干湿循环
自由膨胀率
twice admixture lime method
lime-tread expansive soil
dry-wet cycling
free swelling ratio
