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Micro-characteristics of granite impinged by abrasive water jet from a mineralogical perspective

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Title: Micro-characteristics of granite impinged by abrasive water jet from a mineralogical perspective
Authors: Zhongtan Li, Zhaolong Ge, Qinglin Deng, Zhe Zhou, Lei Liu, Jianming Shangguan, Chuanfu Shao
Source: Journal of Rock Mechanics and Geotechnical Engineering, Vol 17, Iss 2, Pp 1008-1017 (2025)
Publisher Information: Elsevier, 2025.
Publication Year: 2025
Collection: LCC:Engineering geology. Rock mechanics. Soil mechanics. Underground construction
Subject Terms: Abrasive water jet (AWJ), Drilling, Hot dry rock (HDR), Perforation, Fracture generation, Removal mechanism, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, TA703-712
More Details: An abrasive water jet (AWJ) is commonly used to develop deep geothermal resources, such as drilling in hot dry rock (HDR). The influence of rock mineral properties, such as mineral types, mineral contents, and grain size, on the formation of perforation by AWJ is unclear yet. In this study, we investigate AWJ impacts on three types of granite samples with different mineral fractions using a polarizing microscope and scanning electron microscope (SEM). The results show that when the grain size is doubled, the perforation depth increases by 16.22% under the same type of structure and properties. In general, fractures are more likely to be created at the position of rough surfaces caused by abrasive impact, and the form of fractures is determined by the mineral type. In addition, microstructure analysis shows that transgranular fractures typically pass through large feldspar particles and quartz removal occurs along mineral boundaries. The longitudinal extension of perforation depends mainly on the strong kinetic energy of the jet, while the lateral extension is controlled by the backflow. The results contribute to a better understanding of the process involved in the breaking of hard rock by abrasive jets during deep geothermal drilling.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1674-7755
Relation: http://www.sciencedirect.com/science/article/pii/S1674775524002920; https://doaj.org/toc/1674-7755
DOI: 10.1016/j.jrmge.2024.03.032
Access URL: https://doaj.org/article/6b23e1b68752449b8cae842986a60608
Accession Number: edsdoj.6b23e1b68752449b8cae842986a60608
Database: Directory of Open Access Journals
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  Data: Journal of Rock Mechanics and Geotechnical Engineering, Vol 17, Iss 2, Pp 1008-1017 (2025)
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  Data: <searchLink fieldCode="DE" term="%22Abrasive+water+jet+%28AWJ%29%22">Abrasive water jet (AWJ)</searchLink><br /><searchLink fieldCode="DE" term="%22Drilling%22">Drilling</searchLink><br /><searchLink fieldCode="DE" term="%22Hot+dry+rock+%28HDR%29%22">Hot dry rock (HDR)</searchLink><br /><searchLink fieldCode="DE" term="%22Perforation%22">Perforation</searchLink><br /><searchLink fieldCode="DE" term="%22Fracture+generation%22">Fracture generation</searchLink><br /><searchLink fieldCode="DE" term="%22Removal+mechanism%22">Removal mechanism</searchLink><br /><searchLink fieldCode="DE" term="%22Engineering+geology%2E+Rock+mechanics%2E+Soil+mechanics%2E+Underground+construction%22">Engineering geology. Rock mechanics. Soil mechanics. Underground construction</searchLink><br /><searchLink fieldCode="DE" term="%22TA703-712%22">TA703-712</searchLink>
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  Data: An abrasive water jet (AWJ) is commonly used to develop deep geothermal resources, such as drilling in hot dry rock (HDR). The influence of rock mineral properties, such as mineral types, mineral contents, and grain size, on the formation of perforation by AWJ is unclear yet. In this study, we investigate AWJ impacts on three types of granite samples with different mineral fractions using a polarizing microscope and scanning electron microscope (SEM). The results show that when the grain size is doubled, the perforation depth increases by 16.22% under the same type of structure and properties. In general, fractures are more likely to be created at the position of rough surfaces caused by abrasive impact, and the form of fractures is determined by the mineral type. In addition, microstructure analysis shows that transgranular fractures typically pass through large feldspar particles and quartz removal occurs along mineral boundaries. The longitudinal extension of perforation depends mainly on the strong kinetic energy of the jet, while the lateral extension is controlled by the backflow. The results contribute to a better understanding of the process involved in the breaking of hard rock by abrasive jets during deep geothermal drilling.
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      – SubjectFull: Abrasive water jet (AWJ)
        Type: general
      – SubjectFull: Drilling
        Type: general
      – SubjectFull: Hot dry rock (HDR)
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      – SubjectFull: Engineering geology. Rock mechanics. Soil mechanics. Underground construction
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