Numerical simulation of fracture evolution behaviors in deep roadway surrounding rock containing discontinuous joints
To explore the internal bearing characteristics and fracture evolution laws of discontinuous jointed rock mass in deep roadways, the −600 m main roadway in Xin ’an Coal Mine was used as the research background. The fracture fractal dimension D was employed to characterize the joint density, and an i...
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Frontiers Media S.A.
2025-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1511853/full |
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| author | Chengjun Hu Gang Song Jiyu Wang Baofu Zhao Zhengya Tao Fan Wen Bo Meng |
| author_facet | Chengjun Hu Gang Song Jiyu Wang Baofu Zhao Zhengya Tao Fan Wen Bo Meng |
| author_sort | Chengjun Hu |
| collection | DOAJ |
| description | To explore the internal bearing characteristics and fracture evolution laws of discontinuous jointed rock mass in deep roadways, the −600 m main roadway in Xin ’an Coal Mine was used as the research background. The fracture fractal dimension D was employed to characterize the joint density, and an intermittent jointed roadway model, both without support and with anchor cable support, was modeled using the particle flow software PFC2D. The internal stress, deformation, and fracture characteristics of intermittent jointed surrounding rock in tunnels with different support methods and joint densities were studied from a microscopic perspective. The results indicate that during the bearing process of the bolt anchor support and unsupported roadway discontinuous jointed rock mass model, the main bearing area of both models transferred from the surface rock mass to the deep rock mass. The tensile cracks of the anchor cable support model were reduced by 57.7% compared with the unsupported model, effectively suppressed the tensile failure of the surrounding rock, and the convergence of the surrounding rock was substantially reduced. The density of intermittent joints was negatively correlated with the bearing capacity of the surrounding rock mass of roadways, and the increase of joint density the overall failure of the surrounding rock, and the possibility of roadway destabilization was increased. Importantly, the number and distribution of intermittent joints in the surface surrounding rock were closely related to the rupture characteristics of the roadways. When the load exceeded the ultimate load of the deep surrounding rock, stress fluctuation occurred due to the stress drop caused by its destruction. This fluctuation promoted the development of intermittent joints in the surface surrounding rock, increasing the risk of roadway destabilization. |
| format | Article |
| id | doaj-art-bee352817a2a4f629759a86da234da60 |
| institution | Kabale University |
| issn | 2296-6463 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
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| spelling | doaj-art-bee352817a2a4f629759a86da234da602025-01-15T06:10:51ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632025-01-011210.3389/feart.2024.15118531511853Numerical simulation of fracture evolution behaviors in deep roadway surrounding rock containing discontinuous jointsChengjun Hu0Gang Song1Jiyu Wang2Baofu Zhao3Zhengya Tao4Fan Wen5Bo Meng6School of Energy and Mining Engineering, China University of Mining and Technology, Beijing, ChinaChina Coal (Tianjin) Underground Engineering Intelligent Research Institute Co., Ltd., Tianjin, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, ChinaChina Coal (Tianjin) Underground Engineering Intelligent Research Institute Co., Ltd., Tianjin, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, ChinaTo explore the internal bearing characteristics and fracture evolution laws of discontinuous jointed rock mass in deep roadways, the −600 m main roadway in Xin ’an Coal Mine was used as the research background. The fracture fractal dimension D was employed to characterize the joint density, and an intermittent jointed roadway model, both without support and with anchor cable support, was modeled using the particle flow software PFC2D. The internal stress, deformation, and fracture characteristics of intermittent jointed surrounding rock in tunnels with different support methods and joint densities were studied from a microscopic perspective. The results indicate that during the bearing process of the bolt anchor support and unsupported roadway discontinuous jointed rock mass model, the main bearing area of both models transferred from the surface rock mass to the deep rock mass. The tensile cracks of the anchor cable support model were reduced by 57.7% compared with the unsupported model, effectively suppressed the tensile failure of the surrounding rock, and the convergence of the surrounding rock was substantially reduced. The density of intermittent joints was negatively correlated with the bearing capacity of the surrounding rock mass of roadways, and the increase of joint density the overall failure of the surrounding rock, and the possibility of roadway destabilization was increased. Importantly, the number and distribution of intermittent joints in the surface surrounding rock were closely related to the rupture characteristics of the roadways. When the load exceeded the ultimate load of the deep surrounding rock, stress fluctuation occurred due to the stress drop caused by its destruction. This fluctuation promoted the development of intermittent joints in the surface surrounding rock, increasing the risk of roadway destabilization.https://www.frontiersin.org/articles/10.3389/feart.2024.1511853/fulldeep roadwayjoint surrounding rockbearing characteristicparticle flowfaulted joints |
| spellingShingle | Chengjun Hu Gang Song Jiyu Wang Baofu Zhao Zhengya Tao Fan Wen Bo Meng Numerical simulation of fracture evolution behaviors in deep roadway surrounding rock containing discontinuous joints Frontiers in Earth Science deep roadway joint surrounding rock bearing characteristic particle flow faulted joints |
| title | Numerical simulation of fracture evolution behaviors in deep roadway surrounding rock containing discontinuous joints |
| title_full | Numerical simulation of fracture evolution behaviors in deep roadway surrounding rock containing discontinuous joints |
| title_fullStr | Numerical simulation of fracture evolution behaviors in deep roadway surrounding rock containing discontinuous joints |
| title_full_unstemmed | Numerical simulation of fracture evolution behaviors in deep roadway surrounding rock containing discontinuous joints |
| title_short | Numerical simulation of fracture evolution behaviors in deep roadway surrounding rock containing discontinuous joints |
| title_sort | numerical simulation of fracture evolution behaviors in deep roadway surrounding rock containing discontinuous joints |
| topic | deep roadway joint surrounding rock bearing characteristic particle flow faulted joints |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1511853/full |
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