Experimental Study on Grouting Seepage Characteristics in Rough Single Microfissure Under Triaxial Stress States.
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| Title: | Experimental Study on Grouting Seepage Characteristics in Rough Single Microfissure Under Triaxial Stress States. |
|---|---|
| Authors: | Yang, Minghao1 (AUTHOR), Zhang, Shuai1,2 (AUTHOR) zhangshuai@ldu.edu.cn, Wang, Mingbin1,3 (AUTHOR), Qin, Junling2 (AUTHOR), Fan, Wenhan3 (AUTHOR), Wu, Yue2 (AUTHOR) |
| Source: | Materials (1996-1944). Aug2025, Vol. 18 Issue 16, p3746. 22p. |
| Subjects: | Grouting, Interfacial roughness, Cement, Microcracks, Axial stresses, Strain sensors |
| Abstract: | The increasing depth of coal mine construction has led to complex geological conditions involving high ground stress and elevated groundwater levels, presenting new challenges for water-sealing technologies in rock microfissure grouting. This study investigates ultrafine cement grouting in microfissures through systematic analysis of slurry properties and grouting simulations. Through systematic analysis of ultrafine cement grout performance across water–cement (W/C) ratios, this study establishes optimal injectable mix proportions. Through dedicated molds, sandstone-like microfissures with 0.2 mm apertures and controlled roughness (JRC = 0–2, 4–6, 10–12) were fabricated, and instrumented with fiber Bragg grating (FBG) sensors for real-time strain monitoring. Triaxial stress-permeation experiments under 6 and 7 MPa confining pressures quantify the coupled effects of fissure roughness, grouting pressure, and confining stress on volumetric flow rate and fissure deformation. Key findings include: (1) Slurry viscosity decreased monotonically with higher W/C ratios, while bleeding rate exhibited a proportional increase. At a W/C ratio = 1.6, the 2 h bleeding rate reached 7.8%, categorizing the slurry as unstable. (2) Experimental results demonstrate that increased surface roughness significantly enhances particle deposition–aggregation phenomena at grouting inlets, thereby reducing the success rate of grouting simulations. (3) The volumetric flow rate of ultrafine cement grout decreases with elevated roughness but increases proportionally with applied grouting pressure. (4) Under identical grouting pressure conditions, the relative variation in strain values among measurement points becomes more pronounced with increasing roughness of the specimen's microfissures. This research resolves critical challenges in material selection, injectability, and seepage–deformation mechanisms for microfissure grouting, establishing that the W/C ratio governs grout performance while surface roughness dictates grouting efficacy. These findings provide theoretical guidance for water-blocking grouting engineering in microfissures. [ABSTRACT FROM AUTHOR] |
| Copyright of Materials (1996-1944) is the property of MDPI 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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| Header | DbId: egs DbLabel: Engineering Source An: 187614879 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Experimental Study on Grouting Seepage Characteristics in Rough Single Microfissure Under Triaxial Stress States. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Yang%2C+Minghao%22">Yang, Minghao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Shuai%22">Zhang, Shuai</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> zhangshuai@ldu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Mingbin%22">Wang, Mingbin</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qin%2C+Junling%22">Qin, Junling</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fan%2C+Wenhan%22">Fan, Wenhan</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Yue%22">Wu, Yue</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Aug2025, Vol. 18 Issue 16, p3746. 22p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Grouting%22">Grouting</searchLink><br /><searchLink fieldCode="DE" term="%22Interfacial+roughness%22">Interfacial roughness</searchLink><br /><searchLink fieldCode="DE" term="%22Cement%22">Cement</searchLink><br /><searchLink fieldCode="DE" term="%22Microcracks%22">Microcracks</searchLink><br /><searchLink fieldCode="DE" term="%22Axial+stresses%22">Axial stresses</searchLink><br /><searchLink fieldCode="DE" term="%22Strain+sensors%22">Strain sensors</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The increasing depth of coal mine construction has led to complex geological conditions involving high ground stress and elevated groundwater levels, presenting new challenges for water-sealing technologies in rock microfissure grouting. This study investigates ultrafine cement grouting in microfissures through systematic analysis of slurry properties and grouting simulations. Through systematic analysis of ultrafine cement grout performance across water–cement (W/C) ratios, this study establishes optimal injectable mix proportions. Through dedicated molds, sandstone-like microfissures with 0.2 mm apertures and controlled roughness (JRC = 0–2, 4–6, 10–12) were fabricated, and instrumented with fiber Bragg grating (FBG) sensors for real-time strain monitoring. Triaxial stress-permeation experiments under 6 and 7 MPa confining pressures quantify the coupled effects of fissure roughness, grouting pressure, and confining stress on volumetric flow rate and fissure deformation. Key findings include: (1) Slurry viscosity decreased monotonically with higher W/C ratios, while bleeding rate exhibited a proportional increase. At a W/C ratio = 1.6, the 2 h bleeding rate reached 7.8%, categorizing the slurry as unstable. (2) Experimental results demonstrate that increased surface roughness significantly enhances particle deposition–aggregation phenomena at grouting inlets, thereby reducing the success rate of grouting simulations. (3) The volumetric flow rate of ultrafine cement grout decreases with elevated roughness but increases proportionally with applied grouting pressure. (4) Under identical grouting pressure conditions, the relative variation in strain values among measurement points becomes more pronounced with increasing roughness of the specimen's microfissures. This research resolves critical challenges in material selection, injectability, and seepage–deformation mechanisms for microfissure grouting, establishing that the W/C ratio governs grout performance while surface roughness dictates grouting efficacy. These findings provide theoretical guidance for water-blocking grouting engineering in microfissures. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Materials (1996-1944) is the property of MDPI 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: 10.3390/ma18163746 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 22 StartPage: 3746 Subjects: – SubjectFull: Grouting Type: general – SubjectFull: Interfacial roughness Type: general – SubjectFull: Cement Type: general – SubjectFull: Microcracks Type: general – SubjectFull: Axial stresses Type: general – SubjectFull: Strain sensors Type: general Titles: – TitleFull: Experimental Study on Grouting Seepage Characteristics in Rough Single Microfissure Under Triaxial Stress States. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Yang, Minghao – PersonEntity: Name: NameFull: Zhang, Shuai – PersonEntity: Name: NameFull: Wang, Mingbin – PersonEntity: Name: NameFull: Qin, Junling – PersonEntity: Name: NameFull: Fan, Wenhan – PersonEntity: Name: NameFull: Wu, Yue IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 08 Text: Aug2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 19961944 Numbering: – Type: volume Value: 18 – Type: issue Value: 16 Titles: – TitleFull: Materials (1996-1944) Type: main |
| ResultId | 1 |
