Finite-Difference Analysis of Influence of Borehole Diameter and Spacing on Reduction in Rockburst Potential of Burst-Prone Coal Seams
Decreasing the rockburst potential in longwall mining of burst-prone coal seams has been a longstanding challenge for geotechnical engineering worldwide. One of the effective approaches is drilling of relief boreholes in front of the coal seam face from the airways. This work presents a novel approa...
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2024-12-01
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| author | Mikhail O. Eremin Artyom O. Chirkov Albert Pazhin Sergey A. Laptev Dmitriy V. Chanov |
| author_facet | Mikhail O. Eremin Artyom O. Chirkov Albert Pazhin Sergey A. Laptev Dmitriy V. Chanov |
| author_sort | Mikhail O. Eremin |
| collection | DOAJ |
| description | Decreasing the rockburst potential in longwall mining of burst-prone coal seams has been a longstanding challenge for geotechnical engineering worldwide. One of the effective approaches is drilling of relief boreholes in front of the coal seam face from the airways. This work presents a novel approach based on the integral rockburst factor (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>K</mi></mrow><mrow><mi>I</mi><mi>r</mi><mi>b</mi></mrow></msub></mrow></semantics></math></inline-formula>) taking account of the length of the dynamic abutment stress influence zone and the ratio of the vertical stress to the remote field virgin stress. The geotechnical conditions of seam 3 of the Alardinskaya mine (Kuznetsky basin, Russia) are taken as a study site. An approach of the finite-difference continuum damage mechanics is employed to describe the processes of deformation and fracture of coal and host rocks using an in-house software. The results indicate that the abutment stress maximum shifts deep into the seam after drilling and that the stress distribution along the coal seam horizon is a superposition of the solutions similar to those of the elastoplastic Kirsch problem. The results also indicate that the curves of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>K</mi></mrow><mrow><mi>I</mi><mi>r</mi><mi>b</mi></mrow></msub></mrow></semantics></math></inline-formula> dependence on spacing between the boreholes and their diameter are nonlinear and non-monotonic functions, which allows for optimizing of the drilling technology. |
| format | Article |
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| institution | Kabale University |
| issn | 2673-6489 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
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| series | Mining |
| spelling | doaj-art-8e2d82a62d43478ba38628fca1d7f23a2024-12-27T14:42:02ZengMDPI AGMining2673-64892024-12-01441058107410.3390/mining4040058Finite-Difference Analysis of Influence of Borehole Diameter and Spacing on Reduction in Rockburst Potential of Burst-Prone Coal SeamsMikhail O. Eremin0Artyom O. Chirkov1Albert Pazhin2Sergey A. Laptev3Dmitriy V. Chanov4Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Laboratory of Mechanics of Heterogeneous Media, 8/2 Akademicheskii Pr., Tomsk 634055, RussiaInstitute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Laboratory of Mechanics of Heterogeneous Media, 8/2 Akademicheskii Pr., Tomsk 634055, RussiaInstitute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Laboratory of Mechanics of Heterogeneous Media, 8/2 Akademicheskii Pr., Tomsk 634055, RussiaInstitute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Laboratory of Mechanics of Heterogeneous Media, 8/2 Akademicheskii Pr., Tomsk 634055, RussiaInstitute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Laboratory of Mechanics of Heterogeneous Media, 8/2 Akademicheskii Pr., Tomsk 634055, RussiaDecreasing the rockburst potential in longwall mining of burst-prone coal seams has been a longstanding challenge for geotechnical engineering worldwide. One of the effective approaches is drilling of relief boreholes in front of the coal seam face from the airways. This work presents a novel approach based on the integral rockburst factor (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>K</mi></mrow><mrow><mi>I</mi><mi>r</mi><mi>b</mi></mrow></msub></mrow></semantics></math></inline-formula>) taking account of the length of the dynamic abutment stress influence zone and the ratio of the vertical stress to the remote field virgin stress. The geotechnical conditions of seam 3 of the Alardinskaya mine (Kuznetsky basin, Russia) are taken as a study site. An approach of the finite-difference continuum damage mechanics is employed to describe the processes of deformation and fracture of coal and host rocks using an in-house software. The results indicate that the abutment stress maximum shifts deep into the seam after drilling and that the stress distribution along the coal seam horizon is a superposition of the solutions similar to those of the elastoplastic Kirsch problem. The results also indicate that the curves of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>K</mi></mrow><mrow><mi>I</mi><mi>r</mi><mi>b</mi></mrow></msub></mrow></semantics></math></inline-formula> dependence on spacing between the boreholes and their diameter are nonlinear and non-monotonic functions, which allows for optimizing of the drilling technology.https://www.mdpi.com/2673-6489/4/4/58numerical modelinglongwall miningrelief boreholesabutment stressintegral rockburst factor |
| spellingShingle | Mikhail O. Eremin Artyom O. Chirkov Albert Pazhin Sergey A. Laptev Dmitriy V. Chanov Finite-Difference Analysis of Influence of Borehole Diameter and Spacing on Reduction in Rockburst Potential of Burst-Prone Coal Seams Mining numerical modeling longwall mining relief boreholes abutment stress integral rockburst factor |
| title | Finite-Difference Analysis of Influence of Borehole Diameter and Spacing on Reduction in Rockburst Potential of Burst-Prone Coal Seams |
| title_full | Finite-Difference Analysis of Influence of Borehole Diameter and Spacing on Reduction in Rockburst Potential of Burst-Prone Coal Seams |
| title_fullStr | Finite-Difference Analysis of Influence of Borehole Diameter and Spacing on Reduction in Rockburst Potential of Burst-Prone Coal Seams |
| title_full_unstemmed | Finite-Difference Analysis of Influence of Borehole Diameter and Spacing on Reduction in Rockburst Potential of Burst-Prone Coal Seams |
| title_short | Finite-Difference Analysis of Influence of Borehole Diameter and Spacing on Reduction in Rockburst Potential of Burst-Prone Coal Seams |
| title_sort | finite difference analysis of influence of borehole diameter and spacing on reduction in rockburst potential of burst prone coal seams |
| topic | numerical modeling longwall mining relief boreholes abutment stress integral rockburst factor |
| url | https://www.mdpi.com/2673-6489/4/4/58 |
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