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Evaluation of hydro-mechano-chemical behaviour of bentonite-sand mixtures

Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 637-652页

作者： Wenjing Sun Cheng Liu Diansen Yang Dean Sun Department of Civil and Energy Engineering College of Environmental Science and EngineeringDonghua UniversityShanghai201620China Institute for the Conservation of Cultural Heritage Shanghai UniversityShanghai200444China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Shanghai Construction Group Co. Ltd.Shanghai200080China Department of Civil Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai200444China

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.***.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 pe,montmorillonite void ratio em and critical sand content as are introduced to determine the em-pe relationship and finally the k-em relationship of bentonite-sand mixtures.It is found that when the sand content aas,the em-pe relationship of the mixture is linear and independent of the salt solution concentration,and when a>as,the em-pe relationship of bentonite-sand mixture is bi-linear with the true effective deviatoric stress pesa as the intersection.In addition,the em-k relationship also shows the linear trend when aas,and the slope of the line increases with the increase of the salt solution concentration.When a>as,the k-em 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 r

关键词： Bentonite-sand mixture Hydro-mechano-chemical(HMC)behaviour Salt solution True effective stress

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