Impact of Initial Moisture Content on the Shrinkage-Swelling Behavior of Heishan Bentonite

Zhang, Shu-Cui; Li, Kai; Sun, Ke; Wang, Shuo

doi:10.1007/s12205-021-0060-7

Cited by 3 publications

(1 citation statement)

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“…The application of bentonite to different types of soil is a regularly used way to achieve the hydraulic heating value required by international rules (k 110-9 m/s) [26][27][28]. Bentonite's high swelling-shrinkage capacity may cause increased desiccation cracks in clay liners [29][30][31]. More research is needed into the self-healing capability and hydraulic efficacy of bentonite-modified clay which possess impacts of crackings and leachate.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Desiccation Cracks on the Hydraulic Conductivity of Geosynthetic Clay Liner

2022

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Section: Introductionmentioning

confidence: 99%

Study on the Effect of Desiccation Cracks on the Hydraulic Conductivity of Geosynthetic Clay Liner

2022

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Water Content Evolution in the EDZ of Opalinus Clay: A Methodic Approach for a Comparative Interpretation of Measurements and Modelling

Ziefle,

Cajuhi,

Costabel

et al. 2024

Rock Mech Rock Eng

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In the Mont Terri Rock Laboratory (Switzerland), an interdisciplinary examination program is carried out to increase knowledge about coupled hydro-mechanical effects in Opalinus Clay, which are of significant interest regarding the stability and integrity of a potential storage facility for high-level radioactive waste. This article focuses on the characterization of the claystone in the near field of excavations and related hydraulic effects due to excavation and ventilation. Electrical resistivity tomography (ERT) is applied to characterize the OPA: Several open fractures correlate with regions of high resistivity values, indicating potential preferential flow paths that are relevant for transport processes. Due to the combined interpretation of ERT long-term monitoring and seasonally repeated nuclear magnetic resonance (NMR) measurements, a relationship between electrical resistivity and water content can be established, resulting also in a time-dependent map of the water content around excavations with different climatic conditions. The statistical interpretation of these measurements indicates the existence of small-scale singularities in contrast to dominating, more homogeneous zones. The presented approach leads to a better process understanding of these heterogeneous near field effects and provides a valuable basis for a pragmatic approach to safety assessment.

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Mechanical Characteristics of Heishan Bentonite for Hazardous Waste Contamination Prevention

Sun

et al. 2022

Front. Earth Sci.

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A series of laboratory-based water infiltration tests at room temperature have been conducted to investigate the mechanical characteristics of Heishan bentonite as a potential backfill material. The experiments were performed with an oedometer testing apparatus which facilitates the mechanical loading, the water infiltration, and the deformation measurement. The results show that both swelling pressure-initial dry density and swelling strain-moisture content have an exponential relationship. Moreover, swelling strain dramatically decreases when the applied stress exceeds a reference stress of 100 kpa. Finally, permeability tests were carried on Heishan bentonite specimen and the studied material reaches an impermeable state when the moisture content is larger than 40%. The presented properties certificate that Heishan bentonite can be employed as a backfill material in engineering practice.

show abstract

Impact of Initial Moisture Content on the Shrinkage-Swelling Behavior of Heishan Bentonite

Cited by 3 publications

References 24 publications

Study on the Effect of Desiccation Cracks on the Hydraulic Conductivity of Geosynthetic Clay Liner

Study on the Effect of Desiccation Cracks on the Hydraulic Conductivity of Geosynthetic Clay Liner

Water Content Evolution in the EDZ of Opalinus Clay: A Methodic Approach for a Comparative Interpretation of Measurements and Modelling

Mechanical Characteristics of Heishan Bentonite for Hazardous Waste Contamination Prevention

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