Deterioration of exposed buffer block: desiccation shrinkage and cracking

Tan, Yu; He, Dongjin; Zhang, Guochao

doi:10.1007/s10064-019-01475-5

Cited by 18 publications

(1 citation statement)

References 40 publications

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“…The main reason that the SWCCs of these two bentonites could not be completely coincided was due to the inconsistency of mineral composition, resulting in different speci c surface areas and surface charge densities of particles(Tripathy et al 2014;Fattah et al 2017), which would show different water retention. Furthermore, GMZ bentonite-sand mixture is a feasible buffer back ll block material for the HLW disposal in China(Tan et al 2019;Zhang et al 2019;Tan et al 2020).…”

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Soil-Water Characteristic Curves And Hydraulic Conductivity of Gaomiaozi Bentonite Pellet-Contained Materials

Zhu

2021

Preprint

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The bentonite pellet-contained material (PCM) is a feasible material for the joint sealing of high-level radioactive waste repository. During the operation of the repository, the PCM will be unsaturated for a long time, and its water retention and permeability directly affect the buffer barrier seepage, nuclide migration, and joint healing. Moreover, the particle size of bentonite pellets and dry density are important factors affecting the performance of PCM. In this work, the pressure plate method and vapour equilibrium technique were utilized to test the soil-water characteristic curves (SWCCs) of the PCMs with different particle sizes and dry densities. The unsaturated hydraulic conductivity of the PCMs was predicted by combining the SWCC model and saturated hydraulic conductivity. The results showed that in the low suction range (20–1150 kPa), the dry density and particle size had a negative correlation with the water content at the same suction. In the high suction range (4200–309000 kPa), the dry density and particle size had little effect on the SWCC. The Gardner model was appropriate for describing the SWCC of PCM. In addition, the hydraulic conductivity of the PCM decreased with the increase in dry density, while increased with the increase in particle size. The influence mechanism of the SWCC and hydraulic conductivity was further discussed based on the scanning electron microscopy images and pore size distribution curves.

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Soil-Water Characteristic Curves And Hydraulic Conductivity of Gaomiaozi Bentonite Pellet-Contained Materials

Zhu

2021

Preprint

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Soil–water characteristic curves and hydraulic conductivity of Gaomiaozi bentonite pellet-contained materials

Zhu

2022

Environ Earth Sci

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The bentonite pellet-contained material (PCM) is a feasible material for the joint sealing of high-level radioactive waste repository. During the operation of the repository, the PCM will be unsaturated for a long time, and its water retention and permeability directly affect the buffer barrier seepage, nuclide migration, and joint healing. Moreover, the particle size of bentonite pellets and dry density are important factors affecting the performance of PCM. In this work, the pressure plate method and vapour equilibrium technique were utilized to test the soil-water characteristic curves (SWCCs) of the PCMs with different particle sizes and dry densities. The unsaturated hydraulic conductivity of the PCMs was predicted by combining the SWCC model and saturated hydraulic conductivity. The results showed that in the low suction range (20-1150 kPa), the dry density and particle size had a negative correlation with the water content at the same suction. In the high suction range (4200-309000 kPa), the dry density and particle size had little effect on the SWCC. The Gardner model was appropriate for describing the SWCC of PCM.In addition, the hydraulic conductivity of the PCM decreased with the increase in dry density, while increased with the increase in particle size. The in uence mechanism of the SWCC and hydraulic conductivity was further discussed based on the scanning electron microscopy images and pore size distribution curves.

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Assessment of the Desiccation Cracking Characteristics of Clay Reinforced with Fibers Utilizing the Distributed Optical Fiber Sensing (DOFS) Technique

Chaduvula,

Wong,

Shannon

et al. 2024

Indian Geotech J

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Deterioration of exposed buffer block: desiccation shrinkage and cracking

Cited by 18 publications

References 40 publications

Soil-Water Characteristic Curves And Hydraulic Conductivity of Gaomiaozi Bentonite Pellet-Contained Materials

Soil-Water Characteristic Curves And Hydraulic Conductivity of Gaomiaozi Bentonite Pellet-Contained Materials

Soil–water characteristic curves and hydraulic conductivity of Gaomiaozi bentonite pellet-contained materials

Assessment of the Desiccation Cracking Characteristics of Clay Reinforced with Fibers Utilizing the Distributed Optical Fiber Sensing (DOFS) Technique

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