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膨润土对土体微观孔隙结构特征影响的试验研究

闫小庆, 房营光, 张平

闫小庆, 房营光, 张平. 膨润土对土体微观孔隙结构特征影响的试验研究[J]. 岩土工程学报, 2011, 33(8): 1302-1307.
引用本文: 闫小庆, 房营光, 张平. 膨润土对土体微观孔隙结构特征影响的试验研究[J]. 岩土工程学报, 2011, 33(8): 1302-1307.
YAN Xiao-qing, FANG Ying-guang, ZHANG Ping. Experiment study on the effects of bentonite on the micropore structure characteristics of soil[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(8): 1302-1307.
Citation: YAN Xiao-qing, FANG Ying-guang, ZHANG Ping. Experiment study on the effects of bentonite on the micropore structure characteristics of soil[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(8): 1302-1307.

膨润土对土体微观孔隙结构特征影响的试验研究  English Version

基金项目: 华南理工大学亚热带建筑科学国家重点实验室自主项目( 2008ZA11 )
详细信息
    作者简介:

    闫小庆 (1981 – ) ,女,博士研究生,主要从事岩土工程方面的研究。

  • 中图分类号: TU411

Experiment study on the effects of bentonite on the micropore structure characteristics of soil

  • 摘要: 土体的微观孔隙结构特征 对其渗透性有着显著的影响,膨润土具有很强的防渗性能,在土中加入膨润土可改变其 孔隙尺度分布和结构特征 而降低土的渗透性。采用压汞仪法 (MIP) 试验研究了掺加不同比例的膨润土的细颗粒土的微观孔隙结构特征。试验结果表明:只要加入少量的膨润土便可使土体的大孔隙的数量急剧减少;随着膨润土的含量的增多,孔隙尺度分布逐渐发生变化,中孔隙的数量逐渐减少,小孔隙、微孔隙和超微孔隙的数量逐渐增多,孔隙分布密度函数由三峰态转变为双峰态,峰值所对应的孔隙直径减小。实验结果也证明了同一孔隙比的土样的孔隙特征的多样性,因此工程中采用的表达土的孔隙含量的宏观参数孔隙比并不能完整描述土体的孔隙特征,需要引入其他微观参数对土的孔隙特征进行描述。文中的研究对防渗工程设计与施工具有参考价值。
    Abstract: The micropore structure characteristics have significant influence on permeability of the soil, and bentonite is high anti-seepage material, which is added into the soil to reduce the peamiability by changing the pore-scale distrbution and pore characteristics of the soil. The micropore structure characteristics of the soil added with different bentonite contents are measured by the mercury intrusion porosimetry (MIP). The test results show that just adding a little bentonite can reduce the quantity of the large pore abruptly. With the increase of bentonite content, the pore-scale distribution changes gradually, the quantity of the middle pore increases, the quantities of the small pore, the micropore and the supermicro-pore increase gradually, and the pore size distribution density function changes from three-model to bi-model while the pore diameter size corresponding to the peak decreases. It is proved that the pore characteristics of the same void ratio are various according to the test results, so the void ratio which is a macroscope parameter can not represent the pore characteristics of the soil perfectly and it is necessary to introduce other microscope parameters to describe the pore characteristics of the soil. The conclusions have certain referential value for the design and construction of the anti-seepage (infiltration) projects.
  • [1] MITCHELL J K. Fundamentals of soil behavior[M]. New York: John Wiley and Sons Inc, Second Edition, 1993.
    [2] YE Wei-min, CUI Yu-jun, QIAN Li-xin, et al. An experimental study of the water transfer through confined compacted GMZ bentonite[J]. Engineering Geology, 2009, 108 (3-4): 169 – 176.
    [3] 陈 宝 , 叶为民 , 等 . 高庙子膨润土的水土特征曲线 ( 英文 ) [J]. 岩石力学与工程学报 , 2006, 25 (4): 788 – 793. (CHEN Bao, YE Wei-min, et al. Bentonite Soil-Water characteristic curves of Gaomiaozi[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25 (4): 788 – 793. (in Chinese))
    [4] CHAPUIS R P. Sand-bentonite liners: predicting permeability from laboratory tests[J]. Canadian Geotechnical Journal, 1990, 27 (1): 47 – 57.
    [5] SIVAPULLAIAH P V, SRIDHARAN A, STALIN V K. Hydraulic conductivity of bentonite-sand mixtures[J]. Canadian Geotechnical Journal, 2000, 37 (2): 406 – 413.
    [6] ROMERO E, SIMMS P H. Microstructure investigation in unsaturated soils: a review with special attention to contribution of mercury intrusion porosimetry and environmental scanning electron microscopy[J]. Journal of Geotechnical and Geological Engineering, ASCE, 2008, 26 (6): 705 – 727.
    [7] CHENG X H, HANS J, et al. A combination of ESEM, EDX and XRD studies on the fabric of dutch organic clay from Ostva ardersplassen (netherlands) and its geotechnical implications[J]. Applied Clay Science, 2004, 25 : 179 – 185.
    [8] GB/T50123 — 1999 土工试验方法标准 [S]. 1999. (GB/T50123 — 1999 Standard for soil test method[S]. 1999. (in Chinese))
    [9] WASHBURN E W. Note on a method of determining the distribution of pore sizes in a porous material[C]// Proceedings of the National Academy of Sciences USA, 1921, 7 (4): 115 – 116.
    [10] PENUMADU D, DEAN J. Compressibility effect in evaluating the pore-size distribution of kaolin clay using mercury intrusion porosimetry[J]. Canadian Geotechnical Journal, 2000, 37 (2): 393 – 405.
    [11] ASTM D4404-84 Standard test method for determination of pore volume and pore volume distribution of soil and rock by mercury intrusion porosimetry[R]. 2004.
    [12] GB/T 21650.1-2008, 压汞法和气体吸附法测定固体材料孔径分布和孔隙度 第 1 部分:压汞法 (2008) [S]. 2008. (GB/T 21650.1-2008, Pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption-Part 1: Mecury porpsimetry (2008) [S]. 2008. (in Chinese))
    [13] DELAGE P, LEFEBVRE G. Study of the structure of a sensitive champlain clay and of its evolution during consolidation[J]. Canadian Geotechnical Journal, 1984, 21 (1): 21 – 35.
    [14] DE KIMPE C R. Effect of air drying and critical point drying on the porosity of clay soils[J]. Canadian Geotechnical Journal,1984, 21 (1): 181 – 185.
    [15] SHEAR D L, OLSEN H W, NELSON K R. Effects of desiccation on the hydraulic conductivity versus void ratio relationship for a natural clay[M]. Washington: National Academy Press, 1993: 1365 – 1370.
    [16] KODIKARA J, BARBOUR S L, FREDLUND D G. Changes in clay structure and behavior due to wetting and drying[C]// Proceedings of the 8th Australian-New Zealand conference on Geomechanics, 1999: 179 – 186.
    [17] LAPIERRE C, LEROUEIL S, LOCAT J. Mercury intrusion and permeability of louisville clay[J]. Canadian Geotechnical Journal, 1990, 27 (6): 761 – 773.
    [18] DELAGE P, MARCIAL D, CUI Y J, et al. Ageing effects in a compacted benonite: a microstructure approach[J]. Géotechnique, 2006, 56 (5): 291 – 304.
    [19] LI X, ZHANG L M. Characterization of dual-structure pore-size distribution of soil[J]. Canadian Geotechnical Journal, 2009, 46 (2): 129 – 141.
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出版历程
  • 发布日期:  2011-08-14

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