Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology
Multi-coal-seam mining creates surrounding rock control difficulties, because the mining of a coal face in one seam can affect coal faces in another. We examine the effects of multi-coal-seam mining on the evolution of the deviatoric stress distribution and plastic zone in the roadway surrounding ro...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/9891825 |
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| author | Dongdong Chen En Wang Shengrong Xie Fulian He Long Wang Qing Zhang Xiaoyu Wu Zaisheng Jiang Yubo Li Songhao Shi |
| author_facet | Dongdong Chen En Wang Shengrong Xie Fulian He Long Wang Qing Zhang Xiaoyu Wu Zaisheng Jiang Yubo Li Songhao Shi |
| author_sort | Dongdong Chen |
| collection | DOAJ |
| description | Multi-coal-seam mining creates surrounding rock control difficulties, because the mining of a coal face in one seam can affect coal faces in another. We examine the effects of multi-coal-seam mining on the evolution of the deviatoric stress distribution and plastic zone in the roadway surrounding rock. In particular, we use numerical simulation, theoretical calculation, drilling detection, and mine pressure observation to study the distribution and evolution characteristics of deviatoric stress on Tailgate 8709 in No. 11 coal seam in Jinhuagong mine when the N8707 and N8709 coal faces in No. 7-4 coal seam and the N8707 and N8709 coal faces in No. 11 coal seam are mined. The evolution laws of deviatoric stress and the plastic zone of roadway surrounding rock in the advance and behind sections of the coal face are studied, and a corresponding control technology is proposed. The results show that the peak value of deviatoric stress increases with the advance of the coal face, and the positions of the peak value of deviatoric stress and the plastic zone become deeper. The deflection angle of the peak stress after mining at each coal face and the characteristics of the peak zone of deviatoric stress and the plastic zone of the roadway surrounding rock under the disturbance of multi-coal-seam mining are determined. In conclusion, the damage range in the roadway roof in the solid-coal side and coal pillar is large and must be controlled. A combined support technology based on high-strength and high pretension anchor cables and truss anchor cables is proposed; long anchor cables are used to strengthen the support of the roadway roof in the solid-coal side and coal pillar. The accuracy of the calculated plastic zone range and the reliability of the combined support technology are verified through drilling detection and mine pressure observation on site. This research can provide a point of reference for roadway surrounding rock control under similar conditions. |
| format | Article |
| id | doaj-art-e599932a27b64085936a0c75ac91d51f |
| institution | Kabale University |
| issn | 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-e599932a27b64085936a0c75ac91d51f2024-12-02T06:39:58ZengWileyAdvances in Civil Engineering1687-80942020-01-01202010.1155/2020/98918259891825Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control TechnologyDongdong Chen0En Wang1Shengrong Xie2Fulian He3Long Wang4Qing Zhang5Xiaoyu Wu6Zaisheng Jiang7Yubo Li8Songhao Shi9School of Energy and Mining EngineeringSchool of Energy and Mining EngineeringSchool of Energy and Mining EngineeringSchool of Energy and Mining EngineeringSchool of Energy and Mining EngineeringSchool of Energy and Mining EngineeringSchool of Energy and Mining EngineeringSchool of Energy and Mining EngineeringSchool of Energy and Mining EngineeringSchool of Energy and Mining EngineeringMulti-coal-seam mining creates surrounding rock control difficulties, because the mining of a coal face in one seam can affect coal faces in another. We examine the effects of multi-coal-seam mining on the evolution of the deviatoric stress distribution and plastic zone in the roadway surrounding rock. In particular, we use numerical simulation, theoretical calculation, drilling detection, and mine pressure observation to study the distribution and evolution characteristics of deviatoric stress on Tailgate 8709 in No. 11 coal seam in Jinhuagong mine when the N8707 and N8709 coal faces in No. 7-4 coal seam and the N8707 and N8709 coal faces in No. 11 coal seam are mined. The evolution laws of deviatoric stress and the plastic zone of roadway surrounding rock in the advance and behind sections of the coal face are studied, and a corresponding control technology is proposed. The results show that the peak value of deviatoric stress increases with the advance of the coal face, and the positions of the peak value of deviatoric stress and the plastic zone become deeper. The deflection angle of the peak stress after mining at each coal face and the characteristics of the peak zone of deviatoric stress and the plastic zone of the roadway surrounding rock under the disturbance of multi-coal-seam mining are determined. In conclusion, the damage range in the roadway roof in the solid-coal side and coal pillar is large and must be controlled. A combined support technology based on high-strength and high pretension anchor cables and truss anchor cables is proposed; long anchor cables are used to strengthen the support of the roadway roof in the solid-coal side and coal pillar. The accuracy of the calculated plastic zone range and the reliability of the combined support technology are verified through drilling detection and mine pressure observation on site. This research can provide a point of reference for roadway surrounding rock control under similar conditions.http://dx.doi.org/10.1155/2020/9891825 |
| spellingShingle | Dongdong Chen En Wang Shengrong Xie Fulian He Long Wang Qing Zhang Xiaoyu Wu Zaisheng Jiang Yubo Li Songhao Shi Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology Advances in Civil Engineering |
| title | Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology |
| title_full | Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology |
| title_fullStr | Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology |
| title_full_unstemmed | Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology |
| title_short | Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology |
| title_sort | roadway surrounding rock under multi coal seam mining deviatoric stress evolution and control technology |
| url | http://dx.doi.org/10.1155/2020/9891825 |
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