摘要
研究级配、粉粘粒含量、含水率、上覆荷载对冻结过程中冻胀量、冻胀速率的影响,以保证冬季面板堆石坝工程的安全。以蒲石河地区的经验冻结速率为条件控制冻结,采用自上而下的冻结模式,冻结速率控制为20 mm/d。当级配石料粉粘粒含量小于12%时,基本为无冻胀或弱冻胀,冻胀量随粉粘粒含量增加呈线性增长;粉粘粒含量相同时不同级配改变了含水量与冻胀量之间的线性关系的梯度。反向压力与冻胀力相平衡,限制了冻胀时的体积膨胀,工程中宜采用7.5%含水率和12%的粉粘粒含量的级配石料,使用密度为59 g/cm3的混凝土面板可以抑制冻害的发生。
To insure the safe performance of rockfill dam faces in cold seasons, frost tests were carried out at a consistent empirical freezing speed of 20mm/day to study the frost susceptibility of the bedding materials. The influence of gradation, fine particle content, water content, and surcharge of the bedding material on frost heaving were obtained. When fine particle content was below 12%, there was no or only weak frost heaving. Frost increased linearly as fine particle content rose. When the fine particle content was fixed, the linear relationship between the water content and the frost heaving changed with the gradations. Typical water content of 7.5%, fine particle content of 12%, and concrete face density of 59g/cm^3 are suggested for the bedding material to avoid frost damage.
出处
《重庆建筑大学学报》
EI
CSCD
北大核心
2008年第6期136-139,共4页
Journal of Chongqing Jianzhu University
基金
国家自然科学基金资助项目(40571032)
关键词
冻胀
级配石料
冻结速率
粉粘粒含量
frost heaving
bedding material
freezing speed
fine particle content
