高庙子膨润土在高温高压下的强度特性研究

陈皓; 吕海波; 陈正汉

doi:10.11779/CJGE2018S1005

高庙子膨润土在高温高压下的强度特性研究 English Version

陈皓^{1, 2, 3},
吕海波^3, ,,
陈正汉⁴

1. 南京水利科学研究院岩土工程研究所,江苏南京 210024;
2.河海大学土木与交通学院,江苏南京 210098;
3. 广西大学土木建筑工程学院防灾减灾研究所,广西南宁 530004;
4. 陆军勤务学院军事设施系,重庆 401311

基金项目: 国家重点研发计划（2017YFC0405100）; 国家自然科学基金项目（11672330,11272353,11072265）; 江苏省交通运输科技项目（2017T12）; 南京水利科学研究院院基金项目（Y316017）

详细信息

作者简介:
陈皓(1990- ),男,博士研究生,主要从事非饱和土与特殊土方面的研究工作。E-mail: chenhao4912@163.com。

通讯作者:
吕海波，E-mail：lhb@glut.edu.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2018-02-23
- 发布日期: 2018-08-24

Strength properties of GMZ bentonite under high temperatures and pressure

CHEN Hao^{1, 2, 3},
LÜ Hai-bo^3, ,,
CHEN Zheng-han⁴

1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China;
2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;
3. Research Institute of Preventing and Mitigating Disasters, College of Civil Engineering, Guangxi University, Nanning 530004, China;
4. Department of Military Facilities, Army Service College, Chongqing 401311, China

摘要

摘要: 高庙子膨润土是中国高放废物地质库的首选缓冲/回填材料,将长期在高温（100℃左右）高压（数十兆帕）条件下工作。为了探讨高庙子膨润土在高温高压条件下的强度特性,使用高温高压土工三轴仪,共做了81个三轴不排水剪切试验,系统研究了干密度、围压、温度和含水率对其强度特性的影响。研究结果表明：①围压和干密度对高庙子膨润土的破坏形态的影响很大;②高庙子膨润土的强度随含水率增大而减小;温度和干密度对其强度的影响比较复杂,干密度较低时,偏应力-轴向应变曲线的位置随温度升高而上移;但干密度较高时的情况则完全相反;③分别建立了高庙子膨润土的黏聚力和内摩擦角随干密度、含水率和温度变化的公式。本文的研究成果为分析缓冲材料的热-水-力耦合性状提供了科学依据。
- 高庙子膨润土 /
- 高温高压土工三轴仪 /
- 强度特性 /
- 强度参数 /
- 干密度 /
- 含水率
Abstract: GMZ bentonite is the first selection of buffer/backfill material for geological disposal repository of high-level radioactive waste in china. It will work under high temperature and high pressure for a long time. In order to investigate the strength characteristic of GMZ bentonite under high temperature and high pressure, 81 undrained triaxial shearing tests were conducted by using the high-temperature and high-pressure triaxial apparatus, and the effect of dry density, confining pressure, temperature and water content on its strength characteristic were systematically analyzed. The result shows that (1) confining pressure and dry density have a great influence on the failure forms of GMZ bentonite; (2) The strength of GMZ bentonite decrease with the increase of water content; The influence of temperature and dry density on its strength is complex, the position of deviator stress-axial strain curves are rising with the increase of temperature in low dry density, but it’s on the contrary in high dry density; (3) The formula of cohesion and internal friction angle with the changing of dry density, water content and temperature of GMZ bentonite are established, respectively. The research results of this paper provide a scientific basis for analyzing the thermos-hydro-mechanical coupling characteristics of buffer materials.
- Key wards: GMZ bentonite /
- high-temperature and high-pressure triaxial apparatus /
- strength property /
- strength parameter /
- dry density /
- water content

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参考文献(7)

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