›› 2017, Vol. 38 ›› Issue (10): 2949-2956.doi: 10.16285/j.rsm.2017.10.023

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Influences of γ-rays irradiation on strength and deformation behaviors of Gaomiaozi Na-bentonite

LIU Peng1, 2, 6, LIU Jun-xin1, 2, 3, MAO Hai-jun3, YANG Zhong-tian4, LIU Wei4, WU Shang-wei5, WANG Wen-qing6   

  1. 1. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; 2. Key Laboratory of Shock and Vibration of Engineering Materials and Structures of Sichuan Province, Mianyang, Sichuan 621010, China; 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 4. Key Laboratory on Geological Disposal of High-Level Radioactive Waste of China National Nuclear Corporation, China Institute for Radiation Protection, Taiyuan, Shanxi 030006, China; 5. College of Resources and Environment Science, Chongqing University, Chongqing 400044, China; 6. Southern China Branch of CCCC Tunnel Engineering Co., Ltd., Guangzhou, Guangdong 510000, China
  • Received:2016-12-21 Online:2017-10-10 Published:2018-06-05
  • Supported by:

    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).

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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.

Key words: irradiation aging, Na-bentonite, montmorillonite, mechanical strength, swelling property

CLC Number: 

  • TU 443

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