Pressure Relief Mechanism of Directional Hydraulic Fracturing for Gob-Side Entry Retaining and Its Application
In order to make clear the pressure relief mechanism and application effect of directional hydraulic fracturing for gob-side entry retaining, the directional hydraulic fracturing was carried out by 400 m in haulage gateway remaining along the goaf in 50108 working face of Hejiata Coal Mine. Taking t...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/6690654 |
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| _version_ | 1849306372929224704 |
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| author | Zhang Xiao Kang Hongpu |
| author_facet | Zhang Xiao Kang Hongpu |
| author_sort | Zhang Xiao |
| collection | DOAJ |
| description | In order to make clear the pressure relief mechanism and application effect of directional hydraulic fracturing for gob-side entry retaining, the directional hydraulic fracturing was carried out by 400 m in haulage gateway remaining along the goaf in 50108 working face of Hejiata Coal Mine. Taking this as the engineering background, a mechanical model of roof cutting was established and the pressure relief mechanism was clarified. The theoretical research shows that it is the moments of gravity FG of the curved triangular roof plate at the face end, the pressure q of the overlying soft rock, and the transverse force TCB in the “voussoir beam” structure to the left endpoint of the triangular block, that is, MFG, Mq, and MTCB, which determines the roadside supporting resistance. Hydraulic fracturing can reduce the lateral cantilever length of the basic roof, thus greatly reducing the values of MFG, MTCB, and Mq, and significantly reduce the roadside supporting resistance. The field test shows that the directional hydraulic fracturing technology can effectively improve the stress environment of the face end and reduce the deformation of the roadway, and it has a good application effect on the gob-side entry retaining. |
| format | Article |
| id | doaj-art-2de8262633a54836a18b5ab9fca5ddf0 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-2de8262633a54836a18b5ab9fca5ddf02025-08-20T03:55:07ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/66906546690654Pressure Relief Mechanism of Directional Hydraulic Fracturing for Gob-Side Entry Retaining and Its ApplicationZhang Xiao0Kang Hongpu1Coal Mining and Design Branch, China Coal Research Institute, Beijing 100013, ChinaCoal Mining and Design Branch, China Coal Research Institute, Beijing 100013, ChinaIn order to make clear the pressure relief mechanism and application effect of directional hydraulic fracturing for gob-side entry retaining, the directional hydraulic fracturing was carried out by 400 m in haulage gateway remaining along the goaf in 50108 working face of Hejiata Coal Mine. Taking this as the engineering background, a mechanical model of roof cutting was established and the pressure relief mechanism was clarified. The theoretical research shows that it is the moments of gravity FG of the curved triangular roof plate at the face end, the pressure q of the overlying soft rock, and the transverse force TCB in the “voussoir beam” structure to the left endpoint of the triangular block, that is, MFG, Mq, and MTCB, which determines the roadside supporting resistance. Hydraulic fracturing can reduce the lateral cantilever length of the basic roof, thus greatly reducing the values of MFG, MTCB, and Mq, and significantly reduce the roadside supporting resistance. The field test shows that the directional hydraulic fracturing technology can effectively improve the stress environment of the face end and reduce the deformation of the roadway, and it has a good application effect on the gob-side entry retaining.http://dx.doi.org/10.1155/2021/6690654 |
| spellingShingle | Zhang Xiao Kang Hongpu Pressure Relief Mechanism of Directional Hydraulic Fracturing for Gob-Side Entry Retaining and Its Application Shock and Vibration |
| title | Pressure Relief Mechanism of Directional Hydraulic Fracturing for Gob-Side Entry Retaining and Its Application |
| title_full | Pressure Relief Mechanism of Directional Hydraulic Fracturing for Gob-Side Entry Retaining and Its Application |
| title_fullStr | Pressure Relief Mechanism of Directional Hydraulic Fracturing for Gob-Side Entry Retaining and Its Application |
| title_full_unstemmed | Pressure Relief Mechanism of Directional Hydraulic Fracturing for Gob-Side Entry Retaining and Its Application |
| title_short | Pressure Relief Mechanism of Directional Hydraulic Fracturing for Gob-Side Entry Retaining and Its Application |
| title_sort | pressure relief mechanism of directional hydraulic fracturing for gob side entry retaining and its application |
| url | http://dx.doi.org/10.1155/2021/6690654 |
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