摘要
为研究寒冷地区堆石坝垫层材料的冻胀性能,对不同粉粘粒含量(质量分数)、不同含水率(质量分数)的堆石坝垫层材料进行了不同冻结温度、不同冻结速率的冻胀试验.结果表明:冻结温度越低,垫层材料的冻胀量越小,在冻结温度为-3^-7℃时,冻胀量变化最为显著;垫层材料冻胀量随粉粘粒含量和含水率的增大而增大,随冻结速率的增大而减小,且减小趋势近似线性;在相同粉粘粒含量下,高含水率试样冻胀发展迅速,且发展过程较长.含水率9.0%粉粘粒含量12%或含水率7.5%和9.0%粉粘粒含量15%的垫层材料冻胀级别均为弱冻胀,因此建议工程中选用粉粘粒含量小于12%且含水量小于9.0%的材料作为堆石坝垫层材料.
To investigate the frost-heaving property of bedding materials of face rockfill dam in cold regions,frost-heaving test was performed on bedding materials with different clay content（by mass） and water content（by mass） with different freezing temperature and freezing rate.Test results show that the lower the freezing temperature is,the smaller the frost-heaving amount of bedding materials is.The variation of frost-heaving amount is the most significant between-3 ℃ and-7 ℃.Frost-heaving amount increases with the increase of clay content and water content,but linearly decreases with the increase of frost-heaving rate.Prediction formula of frost-heaving amount is given based on the experimental data for bedding materials with 9.0% water content at-3 ℃.With the same clay content,frost-heaving of the sample with high water content developes fast and lasts relatively longer time.The bedding materials with 9.0% water content and 12% clay content,with 7.5% or 9.0% water content and 15% clay content belong to weak frost-heaving materials,so the materials with low clay content（12%） and low water content（（9.0%）） is the first choice to be used for the bedding materials of face rockfill dam.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2010年第3期347-351,共5页
Journal of Building Materials
基金
铁道部科技研究开发计划项目(2006G011-B-3)
国家自然科学基金资助项目(40571032)
关键词
堆石坝垫层材料
冻胀量
冻结温度
冻结速率
粉粘粒含量
含水率
bedding materials of face rockfill dam
frost-heaving amount
freezing temperature
freezing rate
clay content
water content
