Movement of Overlying Strata and Mechanical Responses of Shallow Buried Gas Pipelines in Coal Mining Areas
Damage to buried gas pipelines caused by mining activities has been frequently reported. Based on a case study from the Central China coal mining area, this research employs a scaled model experiment to investigate the movement of overlying strata in a room-and-pillar mining goaf. Distributed optica...
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2025-01-01
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| author | Jiashu Han Zhanguo Ma Junyu Sun Peng Gong Pengfei Yan Chuanchuan Cai Mingshuo Xu Tianqi She |
| author_facet | Jiashu Han Zhanguo Ma Junyu Sun Peng Gong Pengfei Yan Chuanchuan Cai Mingshuo Xu Tianqi She |
| author_sort | Jiashu Han |
| collection | DOAJ |
| description | Damage to buried gas pipelines caused by mining activities has been frequently reported. Based on a case study from the Central China coal mining area, this research employs a scaled model experiment to investigate the movement of overlying strata in a room-and-pillar mining goaf. Distributed optical fiber strain sensors and thin-film pressure sensors were used to simultaneously measure the stress variations in the pipeline and changes in the soil pressure surrounding it. As the mining recovery rate increased from 50% to 86%, the maximum displacement of the overburden sharply escalated from 33.55 mm to 79.19 mm. During surface subsidence, separation between the pipeline and surrounding soil was observed, leading to the formation of a soil-arching effect. The development of the soil-arching effect increased soil pressure on the top of the pipeline, while soil pressure at the bottom of the pipeline increased on the outer side of the subsidence area and decreased on the inner side. Three critical sections of the pipeline were identified, with the maximum stress reaching 1908.41 kPa. After the completion of mining activities, pipeline collapse occurred, leading to a weakening of the soil-arching effect. Consequently, both stress concentration in the pipeline and soil pressure decreased. The probability integral method was corrected by incorporating the fracture angle, which enabled the determination of the location of maximum surface subsidence curvature, found to be close to the three failure sections of the pipeline. |
| format | Article |
| id | doaj-art-ced3f376a1de4b82aa78fea382b49d34 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-ced3f376a1de4b82aa78fea382b49d342025-01-24T13:20:09ZengMDPI AGApplied Sciences2076-34172025-01-0115262210.3390/app15020622Movement of Overlying Strata and Mechanical Responses of Shallow Buried Gas Pipelines in Coal Mining AreasJiashu Han0Zhanguo Ma1Junyu Sun2Peng Gong3Pengfei Yan4Chuanchuan Cai5Mingshuo Xu6Tianqi She7School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221000, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221000, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221000, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221000, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221000, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221000, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221000, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221000, ChinaDamage to buried gas pipelines caused by mining activities has been frequently reported. Based on a case study from the Central China coal mining area, this research employs a scaled model experiment to investigate the movement of overlying strata in a room-and-pillar mining goaf. Distributed optical fiber strain sensors and thin-film pressure sensors were used to simultaneously measure the stress variations in the pipeline and changes in the soil pressure surrounding it. As the mining recovery rate increased from 50% to 86%, the maximum displacement of the overburden sharply escalated from 33.55 mm to 79.19 mm. During surface subsidence, separation between the pipeline and surrounding soil was observed, leading to the formation of a soil-arching effect. The development of the soil-arching effect increased soil pressure on the top of the pipeline, while soil pressure at the bottom of the pipeline increased on the outer side of the subsidence area and decreased on the inner side. Three critical sections of the pipeline were identified, with the maximum stress reaching 1908.41 kPa. After the completion of mining activities, pipeline collapse occurred, leading to a weakening of the soil-arching effect. Consequently, both stress concentration in the pipeline and soil pressure decreased. The probability integral method was corrected by incorporating the fracture angle, which enabled the determination of the location of maximum surface subsidence curvature, found to be close to the three failure sections of the pipeline.https://www.mdpi.com/2076-3417/15/2/622gas pipeline damagecoal mining areascaled model testingoverlying strata movementmeasured pipeline responsessoil-arching effect |
| spellingShingle | Jiashu Han Zhanguo Ma Junyu Sun Peng Gong Pengfei Yan Chuanchuan Cai Mingshuo Xu Tianqi She Movement of Overlying Strata and Mechanical Responses of Shallow Buried Gas Pipelines in Coal Mining Areas Applied Sciences gas pipeline damage coal mining area scaled model testing overlying strata movement measured pipeline responses soil-arching effect |
| title | Movement of Overlying Strata and Mechanical Responses of Shallow Buried Gas Pipelines in Coal Mining Areas |
| title_full | Movement of Overlying Strata and Mechanical Responses of Shallow Buried Gas Pipelines in Coal Mining Areas |
| title_fullStr | Movement of Overlying Strata and Mechanical Responses of Shallow Buried Gas Pipelines in Coal Mining Areas |
| title_full_unstemmed | Movement of Overlying Strata and Mechanical Responses of Shallow Buried Gas Pipelines in Coal Mining Areas |
| title_short | Movement of Overlying Strata and Mechanical Responses of Shallow Buried Gas Pipelines in Coal Mining Areas |
| title_sort | movement of overlying strata and mechanical responses of shallow buried gas pipelines in coal mining areas |
| topic | gas pipeline damage coal mining area scaled model testing overlying strata movement measured pipeline responses soil-arching effect |
| url | https://www.mdpi.com/2076-3417/15/2/622 |
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