Modified effective stress induced by osmotic suction and its validation in volume change and shear strength of bentonite in saline solutions

被引：0
|
作者：
Xu Y.-F. [1 ,2 ]
机构：
[1] Department of Civil Engineering, Shanghai Jiaotong University, Shanghai
[2] Wanjiang Institute of Technology, Maanshan
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2019年 / 41卷 / 04期
关键词：
Bentonite; Modified effective stress; Osmotic suction; Peak shear strength; Surface fractal dimension; Swelling deformation;
D O I：
10.11779/CJGE201904005
中图分类号：
学科分类号：
摘要：
Bentonite is widely seen as a potential buffer/backfill materials for deeply buried geological disposal system to isolate high-level radioactive waste (HLRW). The swelling deformation and shear strength of the bentonite in saline solutions are very important to the safety of the HLRW depository. A conceptual model is proposed to explain the influences of osmotic suction on the volume change and shear strength of the bentonite in a quantitative way. A new formula for the effective stress is proposed as pe=p+pπ incorporating with vertical stress (p) and osmotic suction (π), and pπ=(p/π)Ds-2π. The em-pe relationship is expressed using a unique curve in the form of em=K(pe)Ds-3π for the bentonite in NaCl solutions. The peak shear strength is expressed using a unique curve according to the Mohr-Coulomb criterion for the bentonite in NaCl solutions. © 2019, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：631 / 638
页数：7
相关论文
共 43 条
  • [1] Xu Y.F., Matsuoka H., Sun D.A., Swelling characteristics of fractal-textured bentonite and its mixture, Appl Clay Sci, 22, pp. 197-209, (2003)
  • [2] Qin B., Chen Z.-H., Liu Y.-M., Et al., Swelling-shrinkage behaviour of Gaomiaozi bentonite, Chinese Journal of Geotechnical Engineering, 30, 7, pp. 1005-1010, (2008)
  • [3] Ye W.-M., Huang W., Chen B., Et al., Diffuse double layer theory and volume change behavior of densely compacted Gaomiaozi bentonite, Rock and Soil Mechanics, 30, 7, pp. 1899-1904, (2009)
  • [4] Sun D.-A., Zhang L., Swelling characteristics of Gaomiaozi bentonite saturated by salt solution and their prediction, Rock and Soil Mechanics, 34, 10, pp. 2790-2795, (2013)
  • [5] Zhang H.-Y., Jia L.-Y., Zhou L., Compression behaviors of compacted bentonite-sand mixtures as buffer material for HLW disposal, Rock and Soil Mechanics, 34, 6, pp. 1546-1552, (2013)
  • [6] Ye W.M., Wan M., Chen B., Et al., Temperature effects on the unsaturated permeability of the densely compacted GMZ01 bentonite under confined conditions, Eng Geol, 126, pp. 1-7, (2012)
  • [7] Xu Y.F., Dong P., Fractal approach to hydraulic properties in unsaturated porous media, Chaos, Solitons and Fractals, 19, pp. 327-337, (2004)
  • [8] Tan L.-R., Kong L.-W., Study on variation regularity of swelling behavior of expansive soil, Soil Mechanics, 25, 10, pp. 1555-1559, (2004)
  • [9] Jiang H., Xu Y.-F., Xiang G.-S., Numerical simulation for decay of swelling capacity of bentonite in high-level nuclear waste repository, Journal of Engineering Geology, 22, 2, pp. 203-209, (2014)
  • [10] Sun W.-J., Liu S.-Q., Sun D.-A., Et al., Swelling characteristics of bentonite-sand mixtures with a high sand mixing ratio and its prediction, Chinese Journal of Geotechnical Engineering, 37, 9, pp. 1620-1626, (2015)
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