Evaluation of hydro-mechano-chemical behaviour of bentonite-sand mixtures
文献类型：期刊论文
| 作者 | Sun, Wenjing2,3,4; Liu, Cheng1,5; Yang, Diansen4; Sun, Dean1 |
| 刊名 | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
 |
| 出版日期 | 2022-04-01 |
| 卷号 | 14期号:2页码:637 |
| ISSN号 | 1674-7755 |
| 关键词 | Bentonite-sand mixture Hydro-mechano-chemical (HMC) behaviour Salt solution True effective stress |
| 英文摘要 | Bentonite-sand mixtures are widely used in engineering barrier of deep geological disposal of high-level radioactive nuclear waste and anti-seepage barrier of civil geotechnical engineering. Under the action of groundwater solution infiltration and external stress, the hydro-mechanical (HM) behaviour of bentonitesand mixtures, i.e. the swelling characteristics and permeability, will change. Once the anti-seepage and filtration effect is weakened or lost, the pollutants will spread to the biosphere. Therefore, it is necessary to study the swelling characteristics and permeability of bentonite-sand mixtures under coupled mechanochemical (MC) effect and to establish corresponding prediction model. For this reason, swelling tests under salt solution with different concentrations are conducted on pure bentonite and its mixtures with 30%, 70% and 90% sand contents, the compression tests are carried out on saturated samples, and the saturated permeability coefficient k of the sample under each load is calculated by Terzaghi's one-dimensional consolidation theory. The concepts of true effective stress p(e), montmorillonite void ratio e(m) and critical sand content alpha(s) are introduced to determine the e(m)-p(e) relationship and finally the k-e(m) relationship of bentonite-sand mixtures. It is found that when the sand content alpha <= alpha(s), the e(m)-p(e) relationship of the mixture is linear and independent of the salt solution concentration, and when alpha > alpha(s), the e(m)-p(e) relationship of bentonite-sand mixture is bi-linear with the true effective deviatoric stress p(es alpha) as the intersection. In addition, the e(m)-k relationship also shows the linear trend when alpha <= alpha(s), and the slope of the line increases with the increase of the salt solution concentration. When alpha > alpha(s), the k-e(m) relationship will deviate from the linear relationship. Moreover, the larger the sand content is, the farther the deviation is. On the basis of summing the regularity, a model for predicting the HM behaviour of bentonite-sand mixture under the coupled MC effect is proposed. By comparing the swelling and permeability test results with model prediction results of different types of bentonite and its sand mixtures, the predictive model is verified. The study on the HM behaviour of bentonite-sand mixtures under salt solution infiltration and the model establishment can provide experimental and theoretical basis for the design and construction of anti-seepage engineering by bentonite-sand mixtures. (C) 2022 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. |
| 学科主题 | Engineering |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000774015400025 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35249]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Department of Civil Engineering, School of Mechanics and Engineering Science, Shanghai University, Shanghai, 200444, China 2.Department of Civil and Energy Engineering, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China 3.Institute for the Conservation of Cultural Heritage, Shanghai University, Shanghai, 200444, China 4.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China 5.Shanghai Construction Group Co., Ltd., Shanghai, 200080, China |
| 推荐引用方式 GB/T 7714 | Sun, Wenjing,Liu, Cheng,Yang, Diansen,et al. Evaluation of hydro-mechano-chemical behaviour of bentonite-sand mixtures[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2022,14(2):637. |
| APA | Sun, Wenjing,Liu, Cheng,Yang, Diansen,&Sun, Dean.(2022).Evaluation of hydro-mechano-chemical behaviour of bentonite-sand mixtures.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,14(2),637. |
| MLA | Sun, Wenjing,et al."Evaluation of hydro-mechano-chemical behaviour of bentonite-sand mixtures".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 14.2(2022):637. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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