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Decoding the Hard Roof Control Mechanism of Ground Fracturing Based on the Material Point Method.

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Title: Decoding the Hard Roof Control Mechanism of Ground Fracturing Based on the Material Point Method.
Authors: Xia, Binwei1,2 (AUTHOR), Ma, Zikun1,2 (AUTHOR) 20212001007@stu.cqu.edu.cn, Zhou, Lei1,2 (AUTHOR), Zhou, Yanmin1,2 (AUTHOR), Li, Yang1,2 (AUTHOR)
Source: Rock Mechanics & Rock Engineering. Aug2025, Vol. 58 Issue 8, p8721-8736. 16p.
Subjects: Material point method, Hydraulic fracturing, Mechanical behavior of materials, Surface fault ruptures, Computer simulation, Longwall mining, Bedrock
Abstract: Ground fracturing technology is often used to treat hard roof in recent years. Current research on the mechanism of ground fracturing controlling hard roof mainly focuses on numerical simulation. However, the present numerical simulation methods reveal distinct limitations. Therefore, we developed a numerical model based on the material point method (MPM) to reveal the mechanism of ground fracturing. The model uses the convected particle domain interpolation (CPDI) technique to improve accuracy and a strain-softening model to describe the mechanical properties of rock mass. At first, the reliability of the model proposed in this study is verified by comparing the similar physical simulation test results of the same working face. Based on verification, hydraulic fractures are embedded in the 1# hard roof layer to simulate the impact of ground fracturing on the rock mass. Then the impact of hydraulic fractures on longwall mining is studied numerically. The results document that the hydraulic fractures are activated and communicated with the mining-induced fractures under the disturbance of excavation. This effect promotes the local slip caving of the hard roof, thereby reducing the advance abutment stress of the working face during the collapse of the hard roof. Highlights: The numerical model based on material point method (MPM) developed in this article can reproduce a series of mechanical behaviors in longwall mining including roof subsidence, separation, fracture, fragmentation, and collapse. The impact of hydraulic fracturing on hard roof was considered in the form of a combination of primary and secondary fractures. By comparing the longwall mining model before and after fracturing, the hard roof control mechanism of ground fracturing was revealed. [ABSTRACT FROM AUTHOR]
Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature 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.)
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  Data: Decoding the Hard Roof Control Mechanism of Ground Fracturing Based on the Material Point Method.
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  Data: <searchLink fieldCode="JN" term="%22Rock+Mechanics+%26+Rock+Engineering%22">Rock Mechanics & Rock Engineering</searchLink>. Aug2025, Vol. 58 Issue 8, p8721-8736. 16p.
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  Data: Ground fracturing technology is often used to treat hard roof in recent years. Current research on the mechanism of ground fracturing controlling hard roof mainly focuses on numerical simulation. However, the present numerical simulation methods reveal distinct limitations. Therefore, we developed a numerical model based on the material point method (MPM) to reveal the mechanism of ground fracturing. The model uses the convected particle domain interpolation (CPDI) technique to improve accuracy and a strain-softening model to describe the mechanical properties of rock mass. At first, the reliability of the model proposed in this study is verified by comparing the similar physical simulation test results of the same working face. Based on verification, hydraulic fractures are embedded in the 1# hard roof layer to simulate the impact of ground fracturing on the rock mass. Then the impact of hydraulic fractures on longwall mining is studied numerically. The results document that the hydraulic fractures are activated and communicated with the mining-induced fractures under the disturbance of excavation. This effect promotes the local slip caving of the hard roof, thereby reducing the advance abutment stress of the working face during the collapse of the hard roof. Highlights: The numerical model based on material point method (MPM) developed in this article can reproduce a series of mechanical behaviors in longwall mining including roof subsidence, separation, fracture, fragmentation, and collapse. The impact of hydraulic fracturing on hard roof was considered in the form of a combination of primary and secondary fractures. By comparing the longwall mining model before and after fracturing, the hard roof control mechanism of ground fracturing was revealed. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature 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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        Value: 10.1007/s00603-025-04428-5
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        Text: English
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        Type: general
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      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Surface fault ruptures
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      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Longwall mining
        Type: general
      – SubjectFull: Bedrock
        Type: general
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      – TitleFull: Decoding the Hard Roof Control Mechanism of Ground Fracturing Based on the Material Point Method.
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            NameFull: Xia, Binwei
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              Text: Aug2025
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              Y: 2025
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