岩土力学2017，Vol.38Issue(10)：2949-2956,8.DOI:10.16285/j.rsm.2017.10.023
γ辐照老化对高庙子天然钠基膨润土力学强度和变形特性影响研究
Influences of γ-rays irradiation on strength and deformation behaviors of Gaomiaozi Na-bentonite
摘要
Abstract
Natural Na-bentonite,from Gaomiaozi (GMZ),Inner Mongolia,was tested to study the long-term stability of buffer/backfilling material for high-level radioactive waste geological disposal,.This paper analyzed the effects of γ-rays irradiation on the strength and deformation characteristics of densely compacted Na-bentonite sample.The bentonite was irradiated by cobalt source at different cumulative irradiation doses in laboratory.The mineral composition changes into some more stable silicate and aluminosilicate minerals after irradiation.Then the triaxial shear test and swelling test show that the stability of the microstructure of montmorillonite decreases,and the shear strength and the peak shear strength of bentonite increase with the irradiation dosage under the same confining pressure,due to the change in the mineral composition.With the increase of confining pressure,the strength trend increases gradually slowly,and the effect of irradiation dose on the strength turns to be weaken.It indicates that the confining pressure inhibits the strength increase of bentonite sample.Due to reduction of montmorillonite after irradiation,the swelling deformation property is weakened.The performance is the decrease of the expansion force,free swelling strain,load swelling strain and other indicators.关键词
辐照老化/钠基膨润土/蒙脱石/力学强度/膨胀性能Key words
irradiation aging/Na-bentonite/montmorillonite/mechanical strength/swelling property分类
建筑与水利引用本文复制引用
刘鹏,刘俊新,冒海军,杨仲田,刘伟,巫尚蔚,王文清..γ辐照老化对高庙子天然钠基膨润土力学强度和变形特性影响研究[J].岩土力学,2017,38(10):2949-2956,8.基金项目
十三五国家重点研发计划(No.2017YFC0804600) （No.2017YFC0804600）
四川省科技支撑计划项目(No.2016GZ0157) （No.2016GZ0157）
西南科技大学研究生创新基金资助(No.16ycx078).This work was supported by the National Key R&D Program of China during the 13th Five-Year Plan Period (2017YFC0804600),the Supporting Program for Sci & Tech Research of Sichuan Province (2016GZ0157) and the Postgraduate Innovation Fund Project by Southwest University of Science and Technology (16ycx078). （No.16ycx078）
