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

doi:10.16285/j.rsm.2017.10.023

›› 2017, Vol. 38 ›› Issue (10): 2949-2956.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

刘鹏^{1, 2, 6}，刘俊新^{1, 2, 3}，冒海军³，杨仲田⁴，刘伟⁴，巫尚蔚⁵，王文清⁶

1. 西南科技大学土木工程与建筑学院，四川绵阳 621010；2. 西南科技大学工程材料与结构冲击振动四川省重点实验室，四川绵阳 621010；3. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，湖北武汉 430071；4. 中国辐射防护研究院中核高放废物地质处置评价技术重点实验室，山西太原 030006；5. 重庆大学资源及环境科学学院，重庆 400044；6. 中交隧道工程局有限公司华南分公司，广东广州 510000

收稿日期:2016-12-21 出版日期:2017-10-10 发布日期:2018-06-05
通讯作者: 刘俊新，男，1976年生，博士（后），教授，主要从事岩土体工程力学性能及岩土介质密闭性动态评价方面的研究。E-mail: ljx0614@126.com E-mail:liupeng_luis@163.com
作者简介:刘鹏，男，1990年生，硕士研究生，主要从事岩土工程与高放废物地质处置方面的研究工作
基金资助:
十三五国家重点研发计划(No. 2017YFC0804600)；四川省科技支撑计划项目(No. 2016GZ0157)；西南科技大学研究生创新基金资助 (No. 16ycx078)。

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

LIU Peng^{1, 2, 6}, LIU Jun-xin^{1, 2, 3}, MAO Hai-jun³, YANG Zhong-tian⁴, LIU Wei⁴, WU Shang-wei⁵, WANG Wen-qing⁶

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).

摘要/Abstract

摘要： 为探究高放核废物深地质处置缓冲材料的长期稳定性，以内蒙古高庙子（GMZ）天然钠基膨润土为研究对象，揭示了γ辐照老化作用对高压实天然钠基膨润土样品力学强度和变形特性的影响。采用钴源在室温下对该膨润土进行不同累积剂量的辐照作用，分析了辐照前、后膨润土的矿物成分变化，并开展了三轴剪切以及膨胀变形试验。结果表明：γ辐照老化作用引起膨润土部分矿物成分的变化，蒙脱石微观结构稳定性降低并转化为更稳定的硅酸盐和硅铝酸盐矿物；膨润土经过辐照作用后剪切强度有所增长且随辐照剂量增大，矿物成分发生了变化，同等围压下膨润土的剪切峰值强度逐渐提高；随着围压的增大，强度增长的幅度逐渐变缓，辐照剂量对强度的影响减弱，表明围压对膨润土强度的增长有一定的抑制作用；由于辐照后蒙脱石的含量减少，膨润土的膨胀变形性能相应减弱，即膨胀力、自由膨胀应变、有荷膨胀应变等指标降低。

关键词: 辐照老化, 钠基膨润土, 蒙脱石, 力学强度, 膨胀性能

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

中图分类号:

TU 443

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]. , 2017, 38(10): 2949-2956.

LIU Peng, LIU Jun-xin, MAO Hai-jun, YANG Zhong-tian, LIU Wei, WU Shang-wei, WANG Wen-qing,. Influences of γ-rays irradiation on strength and deformation behaviors of Gaomiaozi Na-bentonite[J]. , 2017, 38(10): 2949-2956.

参考文献

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

[1]	秦爱芳, 胡宏亮. 碱性溶液饱和高庙子钙基膨润土膨胀特性及预测[J]. 岩土力学, 2020, 41(S1): 123-131.
[2]	徐云山, 孙德安, 曾召田, 吕海波, . 膨润土热传导性能时效性试验研究[J]. 岩土力学, 2019, 40(11): 4324-4330.
[3]	王晓，文志杰，MIKAEL Rinne，沈宝堂，谢军，. 非均布荷载作用下煤岩力学强度特性试验研究[J]. , 2017, 38(3): 723-730.
[4]	刘剑，崔鹏, . 水土化学作用对土体黏聚力的影响 ——以蒙脱石-石英砂重塑土为例[J]. , 2017, 38(2): 419-427.
[5]	孙文静，刘仕卿，孙德安，魏振飞. 掺砂率对膨润土与砂混合物膨胀特性的影响[J]. , 2016, 37(6): 1642-1648.
[6]	张龙，孙德安，刘月妙，. 两种高庙子钠基膨润土膨胀特性比较研究[J]. , 2016, 37(12): 3447-3454.
[7]	刘月妙，王驹，曹胜飞，马利科，谢敬礼，赵星光，陈亮. 中国高放废物地质处置缓冲材料大型试验台架和热-水-力-化学耦合性能研究[J]. , 2013, 34(10): 2756-2762.
[8]	刘向君，袁书龙，刘洪，吴小林. 溶液矿化度及加量对钠-蒙脱石晶间距的影响研究[J]. , 2011, 32(1): 137-140.
[9]	王伟，冯小平，邹昀，王俭. 黏性土力学强度与微结构动态环境能场内在关联分析[J]. , 2006, 27(12): 2219-2224.

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

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 9

Metrics

本文评价

推荐阅读 0