Coal‐wall spalling prevention mechanism using advance‐grooving pressure relief in the large‐mining‐height working face of a shallow coal seam
Abstract In mining, the roof structure of a working face with a large mining height in a shallow‐buried coal seam is prone to cutting instability in front of the support, which causes support crushing and coal‐wall spalling. This study analyzes 2201 working faces with large mining heights in the Hai...
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| Format: | Article |
| Language: | English |
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Wiley
2024-11-01
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| Series: | Energy Science & Engineering |
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| Online Access: | https://doi.org/10.1002/ese3.1946 |
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| author | Wang Hongwei Feng Li Zhao Zhouyan Li Yanjun Cao Peipei Jiao Jianqiang Jiang Baolin Liu Yong |
| author_facet | Wang Hongwei Feng Li Zhao Zhouyan Li Yanjun Cao Peipei Jiao Jianqiang Jiang Baolin Liu Yong |
| author_sort | Wang Hongwei |
| collection | DOAJ |
| description | Abstract In mining, the roof structure of a working face with a large mining height in a shallow‐buried coal seam is prone to cutting instability in front of the support, which causes support crushing and coal‐wall spalling. This study analyzes 2201 working faces with large mining heights in the Haiwan No. 3 Mine by investigating the mechanical response law of coal walls under the transient excitation of roof structure instability. A mechanical model of coal walls under dynamic and static load coupling is established, revealing the formation mechanism of coal wall spalling and its main influencing factors. Prevention and control technologies of advanced grooving and pressure relief are proposed, and grooving parameters are determined. The results show that: During the mining process of large mining height working face in shallow buried coal seam, the step change of static response of coal wall is induced by the transient instability of roof structure, and the high abutment pressure is formed on the coal wall. At the same time, the strain energy and gravitational potential energy of roof cutting instability are released to form a dynamic load. Under the action of dynamic and static load, the plastic failure dissipation power of the coal wall is greater than the critical power, and the coal wall spalling occurs. The main influencing factors are mining load, mining height, and internal friction angle of the coal wall. The method of advanced grooving pressure relief can change the roof structure and coal force mechanism, by cutting off the connection between the coal wall and immediate roof, reducing the height of the coal wall force, effectively controlling the position of the roof cut off break line, reducing the static load effect of the roof on the coal, and transferring the position of the dynamic load response to the depth of the coal wall. When the grooving height‐depth ratio k is 0.75, the peak value of the abutment pressure moves 5.57 m to the front of the working face, and the pressure relief effect is the best. The above research results provide an effective active protection method for controlling coal wall spalling in fully mechanised working face with large mining height. |
| format | Article |
| id | doaj-art-96eda438a8884ddcb1978bb38f6e387b |
| institution | Kabale University |
| issn | 2050-0505 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Wiley |
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| series | Energy Science & Engineering |
| spelling | doaj-art-96eda438a8884ddcb1978bb38f6e387b2025-01-06T14:45:33ZengWileyEnergy Science & Engineering2050-05052024-11-0112115105511810.1002/ese3.1946Coal‐wall spalling prevention mechanism using advance‐grooving pressure relief in the large‐mining‐height working face of a shallow coal seamWang Hongwei0Feng Li1Zhao Zhouyan2Li Yanjun3Cao Peipei4Jiao Jianqiang5Jiang Baolin6Liu Yong7College of Energy Engineering Xi'an University of Science and Technology Xi'an ChinaCollege of Energy Engineering Xi'an University of Science and Technology Xi'an ChinaCollege of Energy Engineering Xi'an University of Science and Technology Xi'an ChinaXi'an Research Institute Co., Ltd. Xi'an Shaanxi ChinaHuating Coal Group Co., Ltd. Pingliang Gansu ChinaCollege of Energy Engineering Xi'an University of Science and Technology Xi'an ChinaCollege of Energy Engineering Xi'an University of Science and Technology Xi'an ChinaHuating Coal Group Co., Ltd. Pingliang Gansu ChinaAbstract In mining, the roof structure of a working face with a large mining height in a shallow‐buried coal seam is prone to cutting instability in front of the support, which causes support crushing and coal‐wall spalling. This study analyzes 2201 working faces with large mining heights in the Haiwan No. 3 Mine by investigating the mechanical response law of coal walls under the transient excitation of roof structure instability. A mechanical model of coal walls under dynamic and static load coupling is established, revealing the formation mechanism of coal wall spalling and its main influencing factors. Prevention and control technologies of advanced grooving and pressure relief are proposed, and grooving parameters are determined. The results show that: During the mining process of large mining height working face in shallow buried coal seam, the step change of static response of coal wall is induced by the transient instability of roof structure, and the high abutment pressure is formed on the coal wall. At the same time, the strain energy and gravitational potential energy of roof cutting instability are released to form a dynamic load. Under the action of dynamic and static load, the plastic failure dissipation power of the coal wall is greater than the critical power, and the coal wall spalling occurs. The main influencing factors are mining load, mining height, and internal friction angle of the coal wall. The method of advanced grooving pressure relief can change the roof structure and coal force mechanism, by cutting off the connection between the coal wall and immediate roof, reducing the height of the coal wall force, effectively controlling the position of the roof cut off break line, reducing the static load effect of the roof on the coal, and transferring the position of the dynamic load response to the depth of the coal wall. When the grooving height‐depth ratio k is 0.75, the peak value of the abutment pressure moves 5.57 m to the front of the working face, and the pressure relief effect is the best. The above research results provide an effective active protection method for controlling coal wall spalling in fully mechanised working face with large mining height.https://doi.org/10.1002/ese3.1946coal‐wall spallingcutting instabilitygrooving pressure relieflarge mining heightshallow coal seam |
| spellingShingle | Wang Hongwei Feng Li Zhao Zhouyan Li Yanjun Cao Peipei Jiao Jianqiang Jiang Baolin Liu Yong Coal‐wall spalling prevention mechanism using advance‐grooving pressure relief in the large‐mining‐height working face of a shallow coal seam Energy Science & Engineering coal‐wall spalling cutting instability grooving pressure relief large mining height shallow coal seam |
| title | Coal‐wall spalling prevention mechanism using advance‐grooving pressure relief in the large‐mining‐height working face of a shallow coal seam |
| title_full | Coal‐wall spalling prevention mechanism using advance‐grooving pressure relief in the large‐mining‐height working face of a shallow coal seam |
| title_fullStr | Coal‐wall spalling prevention mechanism using advance‐grooving pressure relief in the large‐mining‐height working face of a shallow coal seam |
| title_full_unstemmed | Coal‐wall spalling prevention mechanism using advance‐grooving pressure relief in the large‐mining‐height working face of a shallow coal seam |
| title_short | Coal‐wall spalling prevention mechanism using advance‐grooving pressure relief in the large‐mining‐height working face of a shallow coal seam |
| title_sort | coal wall spalling prevention mechanism using advance grooving pressure relief in the large mining height working face of a shallow coal seam |
| topic | coal‐wall spalling cutting instability grooving pressure relief large mining height shallow coal seam |
| url | https://doi.org/10.1002/ese3.1946 |
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