Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining: mechanism of progressive and dynamic failure
Abstract Multi-seam mining often leads to the retention of a significant number of coal pillars for purposes such as protection, safety, or water isolation. However, stress concentration beneath these residual coal pillars can significantly impact their strength and stability when mining below them,...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-08-01
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| Series: | International Journal of Coal Science & Technology |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s40789-023-00603-7 |
| _version_ | 1797578542989443072 |
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| author | Yunliang Tan Qing Ma Xiaoli Liu Xuesheng Liu Derek Elsworth Ruipeng Qian Junlong Shang |
| author_facet | Yunliang Tan Qing Ma Xiaoli Liu Xuesheng Liu Derek Elsworth Ruipeng Qian Junlong Shang |
| author_sort | Yunliang Tan |
| collection | DOAJ |
| description | Abstract Multi-seam mining often leads to the retention of a significant number of coal pillars for purposes such as protection, safety, or water isolation. However, stress concentration beneath these residual coal pillars can significantly impact their strength and stability when mining below them, potentially leading to hydraulic support failure, surface subsidence, and rock bursting. To address this issue, the linkage between the failure and instability of residual coal pillars and rock strata during multi-seam mining is examined in this study. Key controls include residual pillar spalling, safety factor (f s), local mine stiffness (LMS), and the post-peak stiffness (k c) of the residual coal pillar. Limits separating the two forms of failure, progressive versus dynamic, are defined. Progressive failure results at lower stresses when the coal pillar transitions from indefinitely stable (f s > 1.5) to failing (f s < 1.5) when the coal pillar can no longer remain stable for an extended duration, whereas sudden (unstable) failure results when the strength of the pillar is further degraded and fails. The transition in mode of failure is defined by the LMS/k c ratio. Failure transitions from quiescent to dynamic as LMS/k c < 1, which can cause chain pillar instability propagating throughout the mine. This study provides theoretical guidance to define this limit to instability of residual coal pillars for multi-seam mining in similar mines. |
| first_indexed | 2024-03-10T22:24:15Z |
| format | Article |
| id | doaj.art-88a3cd56b66a407690cb7d434baaa09a |
| institution | Directory Open Access Journal |
| issn | 2095-8293 2198-7823 |
| language | English |
| last_indexed | 2024-03-10T22:24:15Z |
| publishDate | 2023-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | International Journal of Coal Science & Technology |
| spelling | doaj.art-88a3cd56b66a407690cb7d434baaa09a2023-11-19T12:10:30ZengSpringerOpenInternational Journal of Coal Science & Technology2095-82932198-78232023-08-0110111410.1007/s40789-023-00603-7Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining: mechanism of progressive and dynamic failureYunliang Tan0Qing Ma1Xiaoli Liu2Xuesheng Liu3Derek Elsworth4Ruipeng Qian5Junlong Shang6College of Energy and Mining Engineering, Shandong University of Science and TechnologyCollege of Energy and Mining Engineering, Shandong University of Science and TechnologyState Key Laboratory of Hydroscience and Engineering, Tsinghua UniversityCollege of Energy and Mining Engineering, Shandong University of Science and TechnologyDepartment of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State UniversityState Key Laboratory of Hydroscience and Engineering, Tsinghua UniversityJames Watt School of Engineering, University of GlasgowAbstract Multi-seam mining often leads to the retention of a significant number of coal pillars for purposes such as protection, safety, or water isolation. However, stress concentration beneath these residual coal pillars can significantly impact their strength and stability when mining below them, potentially leading to hydraulic support failure, surface subsidence, and rock bursting. To address this issue, the linkage between the failure and instability of residual coal pillars and rock strata during multi-seam mining is examined in this study. Key controls include residual pillar spalling, safety factor (f s), local mine stiffness (LMS), and the post-peak stiffness (k c) of the residual coal pillar. Limits separating the two forms of failure, progressive versus dynamic, are defined. Progressive failure results at lower stresses when the coal pillar transitions from indefinitely stable (f s > 1.5) to failing (f s < 1.5) when the coal pillar can no longer remain stable for an extended duration, whereas sudden (unstable) failure results when the strength of the pillar is further degraded and fails. The transition in mode of failure is defined by the LMS/k c ratio. Failure transitions from quiescent to dynamic as LMS/k c < 1, which can cause chain pillar instability propagating throughout the mine. This study provides theoretical guidance to define this limit to instability of residual coal pillars for multi-seam mining in similar mines.https://doi.org/10.1007/s40789-023-00603-7Multi-seam miningResidual coal pillarsRock stratumLinkage instability mechanismLocal mine stiffness |
| spellingShingle | Yunliang Tan Qing Ma Xiaoli Liu Xuesheng Liu Derek Elsworth Ruipeng Qian Junlong Shang Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining: mechanism of progressive and dynamic failure International Journal of Coal Science & Technology Multi-seam mining Residual coal pillars Rock stratum Linkage instability mechanism Local mine stiffness |
| title | Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining: mechanism of progressive and dynamic failure |
| title_full | Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining: mechanism of progressive and dynamic failure |
| title_fullStr | Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining: mechanism of progressive and dynamic failure |
| title_full_unstemmed | Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining: mechanism of progressive and dynamic failure |
| title_short | Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining: mechanism of progressive and dynamic failure |
| title_sort | study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining mechanism of progressive and dynamic failure |
| topic | Multi-seam mining Residual coal pillars Rock stratum Linkage instability mechanism Local mine stiffness |
| url | https://doi.org/10.1007/s40789-023-00603-7 |
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