摘要
垫层区是混凝土面板的支撑体,又是坝体抗渗的第二道防线,对大坝安全有着至关重要的作用。为研究垫层料在长期低温条件下的工作性能,采用改进的单向固结装置,进行了不同初始含水率和不同相对密度垫层料的冻融循环试验。研究了冻胀变形规律。结果表明:垫层料冻胀变形随着冻融次数的增加逐渐减小,随初始含水率的增大而增大,随相对密度的增大略有增大。分析表明,垫层料冻胀变形的大小主要取决于垫层料的孔隙分布和饱和度。
Cushion material is the support of concrete panel and the second anti-seepage line of concrete face roekfill dam （ CFRD）, which plays an important role for the dam safety. To study the performance of cushion mate- rial in long-term low temperature environment, freeze-thaw cycling tests are carried out for different initial water content and different relative density of cushion material with modified one-dimensional consolidation odometer. Heave deformations for different samples are observed during freeze-thaw cycles. The results showed that： heave deformation decrease with the increase of freeze-thaw number, while increase with the increase of initial water con- tent. Heave deformation slightly increase with the relative density~ increase. Mechanism analysis show that heave deformation mainly depends on the pore distribution and water saturation degree of cushion material.
出处
《科学技术与工程》
北大核心
2013年第4期1087-1090,1094,共5页
Science Technology and Engineering
关键词
面板坝垫层料
冻融循环
冻胀变形
初始含水率
相对密度
bedding material of face rockfill dam freeze-thaw cycle frost-heaving deformation ini-tial water content relative density
