Stress transfer control technology for fracturing weak structural bodies in subgrade dynamic pressure roadways
In order to meet the needs of safe production in coal mines, many roadways are arranged in the bottom plate of coal seams, such as part of transportation alleys，drainage roadways, and gas extraction roadways. The mining stress generated by the working face causes the stress increase of the surroundi...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Coal Science and Technology
2024-01-01
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| Series: | Meitan kexue jishu |
| Subjects: | |
| Online Access: | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2023-1644 |
| _version_ | 1827318791055343616 |
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| author | Shaojie CHEN Jiangwei LIU Yakang LI Hua LYU |
| author_facet | Shaojie CHEN Jiangwei LIU Yakang LI Hua LYU |
| author_sort | Shaojie CHEN |
| collection | DOAJ |
| description | In order to meet the needs of safe production in coal mines, many roadways are arranged in the bottom plate of coal seams, such as part of transportation alleys，drainage roadways, and gas extraction roadways. The mining stress generated by the working face causes the stress increase of the surrounding rock of the floor roadway through the transmission of the floor rock strata. It exacerbates the deformation of the surrounding rock of the floor roadway, which is easy to cause permanent support failure, roof sinking, dropsy at the bottom of the roadway, convergence of the two gangs, and other damages. In response to this, a control technology is proposed to implement hydraulic fracturing in the stress transfer path, creating a network of hydraulic fractures with a certain spatial pattern in the designated area, forming a fractured weak structural body, realizing stress transfer within the area, thus reducing the stress within the area of the roadway, and controlling the stability of the perimeter rock of the roadway, and through theoretical analysis and field engineering verification, the mechanical mechanism of stress transfer of weak structures in floor dynamic pressure roadway fracturing is revealed, the corresponding mechanical model is established, and the influence factors such as reasonable location and range of weak structures are solved. The results show that: ① Fracturing weak structure causes obvious changes in local stress field, and there are stress increasing zone and stress decreasing zone, and the stress decreasing zone is mainly distributed in the direction of the connection between weak structure and mining stress, mainly concentrated in an arch range; Due to the expansion effect, the stress concentration occurs in the vertical direction of the stress source, and the stress rise area appears. ② The magnitude of maximum principal stress change is related to the long axis L, short axis H, distance P to the roadway, horizontal angle β to the roadway line, strength C and internal friction angle α of the fractured layer, and damage variable D of the fracture in the weak structural body of the fracture. ③ The proposed method is used to design the pressure relief scheme of 103 belt concentrated roadway in Yuandian No. 1 Mine of Huaibei Mining Group. The engineering application results show that the deformation rate of roadway under dynamic pressure of floor is significantly reduced, and the rationality of the stress transfer model of fractured weak structure in roadway under strong dynamic pressure of floor is verified. |
| first_indexed | 2024-04-25T00:07:44Z |
| format | Article |
| id | doaj.art-239314c0ce0544bcad76fc687d573d53 |
| institution | Directory Open Access Journal |
| issn | 0253-2336 |
| language | zho |
| last_indexed | 2024-04-25T00:07:44Z |
| publishDate | 2024-01-01 |
| publisher | Editorial Department of Coal Science and Technology |
| record_format | Article |
| series | Meitan kexue jishu |
| spelling | doaj.art-239314c0ce0544bcad76fc687d573d532024-03-14T03:50:43ZzhoEditorial Department of Coal Science and TechnologyMeitan kexue jishu0253-23362024-01-0152110611610.12438/cst.2023-16442023-1644Stress transfer control technology for fracturing weak structural bodies in subgrade dynamic pressure roadwaysShaojie CHEN0Jiangwei LIU1Yakang LI2Hua LYU3School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266000, ChinaSchool of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266000, ChinaSchool of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266000, ChinaHuaibei Mining Group Yuandian No.1 Mine, Huaibei 235100, ChinaIn order to meet the needs of safe production in coal mines, many roadways are arranged in the bottom plate of coal seams, such as part of transportation alleys，drainage roadways, and gas extraction roadways. The mining stress generated by the working face causes the stress increase of the surrounding rock of the floor roadway through the transmission of the floor rock strata. It exacerbates the deformation of the surrounding rock of the floor roadway, which is easy to cause permanent support failure, roof sinking, dropsy at the bottom of the roadway, convergence of the two gangs, and other damages. In response to this, a control technology is proposed to implement hydraulic fracturing in the stress transfer path, creating a network of hydraulic fractures with a certain spatial pattern in the designated area, forming a fractured weak structural body, realizing stress transfer within the area, thus reducing the stress within the area of the roadway, and controlling the stability of the perimeter rock of the roadway, and through theoretical analysis and field engineering verification, the mechanical mechanism of stress transfer of weak structures in floor dynamic pressure roadway fracturing is revealed, the corresponding mechanical model is established, and the influence factors such as reasonable location and range of weak structures are solved. The results show that: ① Fracturing weak structure causes obvious changes in local stress field, and there are stress increasing zone and stress decreasing zone, and the stress decreasing zone is mainly distributed in the direction of the connection between weak structure and mining stress, mainly concentrated in an arch range; Due to the expansion effect, the stress concentration occurs in the vertical direction of the stress source, and the stress rise area appears. ② The magnitude of maximum principal stress change is related to the long axis L, short axis H, distance P to the roadway, horizontal angle β to the roadway line, strength C and internal friction angle α of the fractured layer, and damage variable D of the fracture in the weak structural body of the fracture. ③ The proposed method is used to design the pressure relief scheme of 103 belt concentrated roadway in Yuandian No. 1 Mine of Huaibei Mining Group. The engineering application results show that the deformation rate of roadway under dynamic pressure of floor is significantly reduced, and the rationality of the stress transfer model of fractured weak structure in roadway under strong dynamic pressure of floor is verified.http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2023-1644mining stressweak structural bodieshydraulic fracturingpressure reliefroof cuttingsurrounding rock control |
| spellingShingle | Shaojie CHEN Jiangwei LIU Yakang LI Hua LYU Stress transfer control technology for fracturing weak structural bodies in subgrade dynamic pressure roadways Meitan kexue jishu mining stress weak structural bodies hydraulic fracturing pressure relief roof cutting surrounding rock control |
| title | Stress transfer control technology for fracturing weak structural bodies in subgrade dynamic pressure roadways |
| title_full | Stress transfer control technology for fracturing weak structural bodies in subgrade dynamic pressure roadways |
| title_fullStr | Stress transfer control technology for fracturing weak structural bodies in subgrade dynamic pressure roadways |
| title_full_unstemmed | Stress transfer control technology for fracturing weak structural bodies in subgrade dynamic pressure roadways |
| title_short | Stress transfer control technology for fracturing weak structural bodies in subgrade dynamic pressure roadways |
| title_sort | stress transfer control technology for fracturing weak structural bodies in subgrade dynamic pressure roadways |
| topic | mining stress weak structural bodies hydraulic fracturing pressure relief roof cutting surrounding rock control |
| url | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2023-1644 |
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