摘要
为了从理论上揭示水泥土抑制冻胀的规律,对掺入不同比例水泥的南京地区典型黏土和砂土进行了冻胀试验研究.试验结果表明:黏土质水泥土和砂土质水泥土的冻胀率均随水泥含量增大而减小,随含水率增大呈线性增大,随龄期增大呈指数减小,随温度升高而呈线性增大,随荷载增大呈指数规律减小;且冻胀率与水泥掺入比变化规律均存在一个最佳掺入比,最佳掺入比对应土体较小的冻胀率,南京地区的典型黏土和砂土的最佳掺入比分别为10%、5%.综合分析可得:冻结法施工时,在土体中预先注一定量的水泥浆并将放置一段时间后再冻结,可减小由于冻胀对工程和环境造成的影响.
In order to reveal the law that the cement-improved soil controls frost heave, experimental research on frost heave properties were conducted with two typical soils in Nanjing region, clay and sand, mixed with the cement. The experiments show that： frost heave coefficient of clay or sand cement-improved soil declines exponentially with mixing ratio of cement increasing, enhances linearly with moisture content increasing, de- clines exponentially with instar increasing, enhances linearly with the cold junction temperature increasing, declines exponentially with load increasing besides there is an optimal mixing ratio, while it is the optimal mix- ing ratio, frost heave coefficient of cement-improved soil are lower, the optimal mixing ratio of clay and sand in Nanjing region is 10% and 5%. By comprehensive analysis, when using the freezing method, before freez-ing, a certain amount of cement can be mixed into the clay or sand, and it is necessary to place it for a period of time, which can reduce frost heave and thaw subsidence, thus reducing the harm to engineering and the en-vironment.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2013年第1期5-9,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(51278251)
南京地铁集团有限公司科研项目(D3-XY-0001-1206)
关键词
水泥土
人工冻土
水泥掺入比
冻胀
cement-improved soil
artificial frozen soil
mixing ratio of cement
frost heave
