岩土力学2012，Vol.33Issue(2)：453-458,6.
膨润土加砂混合物膨胀特征试验研究
Experimental study of swelling characteristics of bentonite-sand mixture
摘要
Abstract
A series of experimental researches of swelling pressure and swelling strain of bentonite-sand mixture are conducted by using self-developed swelling apparatus. Based on the experimental data obtained, the relationships between swelling pressure and time, vertical and horizontal swelling pressures, swellins strain and time, and swelling strain and water-absorbing volume are analyzed. The results show that the maximum swelling pressure and the maximum swelling strain of bentonite-sand mixture depend on the initial dry density and bentonite content of mixture, and increase with the increasing of these two factors. The increase of the dry density results in the decrease of the ratio of horizontal and vertical swelling pressures, and a linear relationship can be obtained between them. For bentonite-sand mixture with different bentonite contents, a hyperbolic relationship is obtained between swelling strain and time, and an approximate S-curve relationship is obtained between swelling strain and water-absorbing volume. Furthermore, the maximum swelling strain and bentonite content of bentonite-sand mixture demonstrate an exponential relationship. The experimental results are of reference value for design of buffer and back-filling materials in high-level radioactive repositories.关键词
膨润土加砂混合物/膨润土/膨胀力/膨胀应变Key words
bentonite-sand mixture/ bentonite/ swelling pressure/ swelling strain分类
建筑与水利引用本文复制引用
胡畔,杨庆..膨润土加砂混合物膨胀特征试验研究[J].岩土力学,2012,33(2):453-458,6.基金项目
国家自然科学基金资助项目(No.51179023). （No.51179023）
