石灰改良云南红粘土路基路用性能研究  

Road Performance of Lime-Modified Yunnan Red Clay Roadbed

作　　者：肖庆一 孙立东 封仕杰 张恒 XIAO Qingyi;SUN Lidong;FENG Shijie;ZHANG Heng(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《重庆交通大学学报（自然科学版）》2020年第10期79-84,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：天津市科技计划项目(16ZXCXSF00110)。

摘　　要：为促进云南红粘土地区道路建设,解决红粘土作为路基填料时所面临的收缩开裂等问题,笔者研究掺入质量分数分别为0、2%、4%、6%、8%、10%的石灰改良云南红粘土,并采用液塑限试验、击实试验、无侧限抗压试验、承载比试验以及收缩试验,对改良红粘土的工程特性进行评价。研究结果表明:在云南红粘土中掺入石灰进行改良,虽然红粘土的体缩率、收缩系数以及缩限略有增大,但其液限、塑性指数以及最佳含水率却降低很多,红粘土的收缩开裂得到很好的抑制;石灰改良红粘土的无侧限抗压强度以及CBR显著提高,抗变形能力增强;综合考虑试验结果,在云南红粘土中掺加质量分数为8%的石灰,能够有效改善红粘土压实特性,提升土体强度,抑制收缩开裂,使其满足公路对路基填料的技术要求。In order to promote the road construction in Yunnan red clay area and solve the problems of shrinkage cracking when red clay was used as roadbed filler,the lime-modified Yunnan red clay with the mass fraction of 0,2%,4%,6%,8%,10%lime was studied.The liquid plastic limit test,compaction test,unconfined compression test,load ratio test and shrinkage test were used to evaluate the engineering properties of the modified red clay.The research results show that when the lime is added to Yunnan red clay for improvement,although the volume shrinkage,shrinkage coefficient and shrinkage limit of Yunnan red clay are slightly increased,the liquid limit,plasticity index and optimum moisture content of red clay are decreased a lot,and the shrinkage cracking of red clay is well restrained.The unconfined compressive strength and CBR of the lime-modified red clay are remarkably improved,and the deformation resistance is enhanced.Comprehensively considering the test results,adding 8%lime in Yunnan red clay can effectively improve the compaction characteristics of red clay,enhance soil strength,inhibit shrinkage cracking,and make it meet the technical requirements of highway subgrade filling.

关 键 词：道路工程 红粘土 石灰 承载比 路基填料 

分 类 号：U414[交通运输工程—道路与铁道工程]