Failure characteristics of overlying strata and mechanism of strong ground pressure during the large‐scale and continuous mining of deep multi working faces
Abstract In this study, a three‐dimensional large‐scale numerical model is established to investigate the failure characteristics of overlying strata and mechanism of strong ground pressure induced by excavation disturbance from multiple working faces. The characteristics of overlying strata fractur...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2024-11-01
|
| Series: | Energy Science & Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ese3.1912 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841557211783888896 |
|---|---|
| author | Defei Zhang Yanan Gao Guangkai Zhang Zhenwei Tang Feng Ding Mingzhong Gao |
| author_facet | Defei Zhang Yanan Gao Guangkai Zhang Zhenwei Tang Feng Ding Mingzhong Gao |
| author_sort | Defei Zhang |
| collection | DOAJ |
| description | Abstract In this study, a three‐dimensional large‐scale numerical model is established to investigate the failure characteristics of overlying strata and mechanism of strong ground pressure induced by excavation disturbance from multiple working faces. The characteristics of overlying strata fractures, heights of the caving zone and the fracture zone, and evolution of the stress field are systematically analyzed. The numerical simulation results reveal that the height of the caving zone after mining is 8.1 m, and that of the fracture zone is 27.3 m under the conditions of gently inclined thin coal seams. These findings are consistent with the theoretical results. The fracture development process can be divided into three stages: extensive development of new fractures, partial compaction of fractures, and closure of numerous fractures. In the structure of the post‐mining overlying rock, four stress zones are identified as follows: two zones of stress concentration at both ends of the working face, respectively, a zone of relatively high stress at the middle of the working face with low overlying strata, and a zone of stress fully released at the middle of the working face with high overlying strata. Comprehensive analysis of the maximum vertical stress of the cross section and the stress of the working face indicates that the stress increases significantly when mining enters the gob square stage and the roof does not collapse timely. |
| format | Article |
| id | doaj-art-1c7694a222c2488bb9afc0d5464d1ad3 |
| institution | Kabale University |
| issn | 2050-0505 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Energy Science & Engineering |
| spelling | doaj-art-1c7694a222c2488bb9afc0d5464d1ad32025-01-06T14:45:33ZengWileyEnergy Science & Engineering2050-05052024-11-0112114950496410.1002/ese3.1912Failure characteristics of overlying strata and mechanism of strong ground pressure during the large‐scale and continuous mining of deep multi working facesDefei Zhang0Yanan Gao1Guangkai Zhang2Zhenwei Tang3Feng Ding4Mingzhong Gao5State 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 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 ChinaCollege of Civil and Transportation Engineering Shenzhen University Shenzhen ChinaAbstract In this study, a three‐dimensional large‐scale numerical model is established to investigate the failure characteristics of overlying strata and mechanism of strong ground pressure induced by excavation disturbance from multiple working faces. The characteristics of overlying strata fractures, heights of the caving zone and the fracture zone, and evolution of the stress field are systematically analyzed. The numerical simulation results reveal that the height of the caving zone after mining is 8.1 m, and that of the fracture zone is 27.3 m under the conditions of gently inclined thin coal seams. These findings are consistent with the theoretical results. The fracture development process can be divided into three stages: extensive development of new fractures, partial compaction of fractures, and closure of numerous fractures. In the structure of the post‐mining overlying rock, four stress zones are identified as follows: two zones of stress concentration at both ends of the working face, respectively, a zone of relatively high stress at the middle of the working face with low overlying strata, and a zone of stress fully released at the middle of the working face with high overlying strata. Comprehensive analysis of the maximum vertical stress of the cross section and the stress of the working face indicates that the stress increases significantly when mining enters the gob square stage and the roof does not collapse timely.https://doi.org/10.1002/ese3.1912deep coal seamfracture development lawlarge‐scale miningmulti working facesstrong ground pressure |
| spellingShingle | Defei Zhang Yanan Gao Guangkai Zhang Zhenwei Tang Feng Ding Mingzhong Gao Failure characteristics of overlying strata and mechanism of strong ground pressure during the large‐scale and continuous mining of deep multi working faces Energy Science & Engineering deep coal seam fracture development law large‐scale mining multi working faces strong ground pressure |
| title | Failure characteristics of overlying strata and mechanism of strong ground pressure during the large‐scale and continuous mining of deep multi working faces |
| title_full | Failure characteristics of overlying strata and mechanism of strong ground pressure during the large‐scale and continuous mining of deep multi working faces |
| title_fullStr | Failure characteristics of overlying strata and mechanism of strong ground pressure during the large‐scale and continuous mining of deep multi working faces |
| title_full_unstemmed | Failure characteristics of overlying strata and mechanism of strong ground pressure during the large‐scale and continuous mining of deep multi working faces |
| title_short | Failure characteristics of overlying strata and mechanism of strong ground pressure during the large‐scale and continuous mining of deep multi working faces |
| title_sort | failure characteristics of overlying strata and mechanism of strong ground pressure during the large scale and continuous mining of deep multi working faces |
| topic | deep coal seam fracture development law large‐scale mining multi working faces strong ground pressure |
| url | https://doi.org/10.1002/ese3.1912 |
| work_keys_str_mv | AT defeizhang failurecharacteristicsofoverlyingstrataandmechanismofstronggroundpressureduringthelargescaleandcontinuousminingofdeepmultiworkingfaces AT yanangao failurecharacteristicsofoverlyingstrataandmechanismofstronggroundpressureduringthelargescaleandcontinuousminingofdeepmultiworkingfaces AT guangkaizhang failurecharacteristicsofoverlyingstrataandmechanismofstronggroundpressureduringthelargescaleandcontinuousminingofdeepmultiworkingfaces AT zhenweitang failurecharacteristicsofoverlyingstrataandmechanismofstronggroundpressureduringthelargescaleandcontinuousminingofdeepmultiworkingfaces AT fengding failurecharacteristicsofoverlyingstrataandmechanismofstronggroundpressureduringthelargescaleandcontinuousminingofdeepmultiworkingfaces AT mingzhonggao failurecharacteristicsofoverlyingstrataandmechanismofstronggroundpressureduringthelargescaleandcontinuousminingofdeepmultiworkingfaces |