Experimental Investigation of Bentonite Slurry Infiltration through Porous Media: Governing Factors and Applications in Tunnel Boring Machine Drilling.
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| Title: | Experimental Investigation of Bentonite Slurry Infiltration through Porous Media: Governing Factors and Applications in Tunnel Boring Machine Drilling. |
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| Authors: | Zhang, Chenghao1 (AUTHOR), Bezuijen, Adam2 (AUTHOR) Adam.Bezuijen@Ugent.be |
| Source: | Journal of Geotechnical & Geoenvironmental Engineering. Jul2026, Vol. 152 Issue 7, p1-21. 21p. |
| Subjects: | Pressure drop (Fluid dynamics), Yield stress, Porous materials, Hydraulic conductivity, Prediction models, Boring machinery, Soil infiltration |
| Abstract: | Infiltration experiments were carried out to elucidate the dominant factors governing the initial fast infiltration of bentonite slurry in a porous medium. Different combinations of two slurries, two sands, two pressures, and two cylindrical setups were tested. Pressure sensors placed at specific locations on the cylinders monitored variations in pore water pressure within sand columns throughout the process of infiltration. A digital balance recorded the real-time amount of discharged water. The experimental outcomes indicated that during bentonite slurry penetration, the yield stress of bentonite slurry had a more pronounced effect on the pressure drop across the slurry infiltration zone than its viscosity. This was evidenced by a comparable pressure drop over a given slurry infiltration distance, which remained hardly affected by fluctuations in infiltration velocity. A greater pressure drop across the slurry-infiltrated zone led to less driving pressure being available to displace water in the unpenetrated sand since the overall pressure drop remains constant. The infiltration velocity of the slurry is determined by this driving pressure in combination with the permeability and length of the unpenetrated sand. Lower driving pressure, reduced sand permeability, or a longer sand length all result in a decreased infiltration velocity. Furthermore, it can be concluded that the yield stress of the slurry in combination with the sand properties determines the final infiltration distance of the bentonite slurry. In the absence of external filter cake formation, this final infiltration distance can be estimated by balancing the pressure drop across the slurry infiltration zone with the applied pressure on the bentonite slurry. An analytical model incorporating the yield stress of the slurry and the equivalent pore radius of the sand was developed to estimate the pressure drop over the slurry infiltration zone. Subsequently, by analyzing the pressure distribution over the testing system, analytical models for determining infiltration velocity and infiltration distance were formulated. Both models demonstrated a high degree of correlation with the experimental data. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geotechnical & Geoenvironmental Engineering is the property of American Society of Civil Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Experimental Investigation of Bentonite Slurry Infiltration through Porous Media: Governing Factors and Applications in Tunnel Boring Machine Drilling. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Chenghao%22">Zhang, Chenghao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bezuijen%2C+Adam%22">Bezuijen, Adam</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> Adam.Bezuijen@Ugent.be</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geotechnical+%26+Geoenvironmental+Engineering%22">Journal of Geotechnical & Geoenvironmental Engineering</searchLink>. Jul2026, Vol. 152 Issue 7, p1-21. 21p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Pressure+drop+%28Fluid+dynamics%29%22">Pressure drop (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Yield+stress%22">Yield stress</searchLink><br /><searchLink fieldCode="DE" term="%22Porous+materials%22">Porous materials</searchLink><br /><searchLink fieldCode="DE" term="%22Hydraulic+conductivity%22">Hydraulic conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Prediction+models%22">Prediction models</searchLink><br /><searchLink fieldCode="DE" term="%22Boring+machinery%22">Boring machinery</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+infiltration%22">Soil infiltration</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Infiltration experiments were carried out to elucidate the dominant factors governing the initial fast infiltration of bentonite slurry in a porous medium. Different combinations of two slurries, two sands, two pressures, and two cylindrical setups were tested. Pressure sensors placed at specific locations on the cylinders monitored variations in pore water pressure within sand columns throughout the process of infiltration. A digital balance recorded the real-time amount of discharged water. The experimental outcomes indicated that during bentonite slurry penetration, the yield stress of bentonite slurry had a more pronounced effect on the pressure drop across the slurry infiltration zone than its viscosity. This was evidenced by a comparable pressure drop over a given slurry infiltration distance, which remained hardly affected by fluctuations in infiltration velocity. A greater pressure drop across the slurry-infiltrated zone led to less driving pressure being available to displace water in the unpenetrated sand since the overall pressure drop remains constant. The infiltration velocity of the slurry is determined by this driving pressure in combination with the permeability and length of the unpenetrated sand. Lower driving pressure, reduced sand permeability, or a longer sand length all result in a decreased infiltration velocity. Furthermore, it can be concluded that the yield stress of the slurry in combination with the sand properties determines the final infiltration distance of the bentonite slurry. In the absence of external filter cake formation, this final infiltration distance can be estimated by balancing the pressure drop across the slurry infiltration zone with the applied pressure on the bentonite slurry. An analytical model incorporating the yield stress of the slurry and the equivalent pore radius of the sand was developed to estimate the pressure drop over the slurry infiltration zone. Subsequently, by analyzing the pressure distribution over the testing system, analytical models for determining infiltration velocity and infiltration distance were formulated. Both models demonstrated a high degree of correlation with the experimental data. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geotechnical & Geoenvironmental Engineering is the property of American Society of Civil Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1061/JGGEFK.GTENG-14329 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 21 StartPage: 1 Subjects: – SubjectFull: Pressure drop (Fluid dynamics) Type: general – SubjectFull: Yield stress Type: general – SubjectFull: Porous materials Type: general – SubjectFull: Hydraulic conductivity Type: general – SubjectFull: Prediction models Type: general – SubjectFull: Boring machinery Type: general – SubjectFull: Soil infiltration Type: general Titles: – TitleFull: Experimental Investigation of Bentonite Slurry Infiltration through Porous Media: Governing Factors and Applications in Tunnel Boring Machine Drilling. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhang, Chenghao – PersonEntity: Name: NameFull: Bezuijen, Adam IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 10900241 Numbering: – Type: volume Value: 152 – Type: issue Value: 7 Titles: – TitleFull: Journal of Geotechnical & Geoenvironmental Engineering Type: main |
| ResultId | 1 |
