A Theoretical Model of Roof Self-Stability in Solid Backfilling Mining and Its Engineering Verification
Roof self-stability in backfilling mining was proposed to explore its connotation and characteristics after a comparative analysis of roof structures under long-wall caving and backfilling mining. The mechanical analysis models of roof self-stability along strike and dip were established. After that...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-11-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/12/23/12114 |
| _version_ | 1827643423154241536 |
|---|---|
| author | Qiang Zhang Kang Yang Jixiong Zhang Qi Wang Longfeng Yuan Zengzhu Shi Xiling Xu |
| author_facet | Qiang Zhang Kang Yang Jixiong Zhang Qi Wang Longfeng Yuan Zengzhu Shi Xiling Xu |
| author_sort | Qiang Zhang |
| collection | DOAJ |
| description | Roof self-stability in backfilling mining was proposed to explore its connotation and characteristics after a comparative analysis of roof structures under long-wall caving and backfilling mining. The mechanical analysis models of roof self-stability along strike and dip were established. After that, the mechanical equations for cooperative roof control were constructed to analyze the elastic foundation coefficients of the backfill, support peak load, unsupported-roof distance, and drilling effect of the working face along strike, the size of the working face, and the section pillar effect along dip. Research showed that the roof self-stability was greatly impacted by the elastic foundation coefficient of backfill, and it was less impacted by the support peak load along strike. The unsupported-roof distance had no obvious effect on roof self-stability. Roof self-stability was significantly affected by the working face and coal-pillar length along the dip. Therefore, the engineering control method of roof self-stability was proposed. The backfilling engineering practice in Xinjulong Coal Mine showed that the maximum roof subsidence was 438 mm, and the backfill ratio was 86.3% when the supporting intensity of backfilling hydraulic support was 0.94 MPa; the advanced distance of the working face was greater than 638 m; the foundation coefficient of backfilling material was 4.16 × 10<sup>8</sup> Nm<sup>−3</sup>. The roof formed the self-stability structure, which satisfied safe coal mining under buildings, water bodies, and railways. |
| first_indexed | 2024-03-09T17:53:10Z |
| format | Article |
| id | doaj.art-538b5cbf741c4c989d8f6e2fe403849f |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T17:53:10Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-538b5cbf741c4c989d8f6e2fe403849f2023-11-24T10:31:13ZengMDPI AGApplied Sciences2076-34172022-11-0112231211410.3390/app122312114A Theoretical Model of Roof Self-Stability in Solid Backfilling Mining and Its Engineering VerificationQiang Zhang0Kang Yang1Jixiong Zhang2Qi Wang3Longfeng Yuan4Zengzhu Shi5Xiling Xu6Key Laboratory of Ministry of Education on Deep Coal Resource Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaKey Laboratory of Ministry of Education on Deep Coal Resource Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaKey Laboratory of Ministry of Education on Deep Coal Resource Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaKailuan (Group) Tangshan Mining Branch, Tangshan 063000, ChinaKailuan (Group) Tangshan Mining Branch, Tangshan 063000, ChinaKailuan (Group) Tangshan Mining Branch, Tangshan 063000, ChinaKailuan (Group) Tangshan Mining Branch, Tangshan 063000, ChinaRoof self-stability in backfilling mining was proposed to explore its connotation and characteristics after a comparative analysis of roof structures under long-wall caving and backfilling mining. The mechanical analysis models of roof self-stability along strike and dip were established. After that, the mechanical equations for cooperative roof control were constructed to analyze the elastic foundation coefficients of the backfill, support peak load, unsupported-roof distance, and drilling effect of the working face along strike, the size of the working face, and the section pillar effect along dip. Research showed that the roof self-stability was greatly impacted by the elastic foundation coefficient of backfill, and it was less impacted by the support peak load along strike. The unsupported-roof distance had no obvious effect on roof self-stability. Roof self-stability was significantly affected by the working face and coal-pillar length along the dip. Therefore, the engineering control method of roof self-stability was proposed. The backfilling engineering practice in Xinjulong Coal Mine showed that the maximum roof subsidence was 438 mm, and the backfill ratio was 86.3% when the supporting intensity of backfilling hydraulic support was 0.94 MPa; the advanced distance of the working face was greater than 638 m; the foundation coefficient of backfilling material was 4.16 × 10<sup>8</sup> Nm<sup>−3</sup>. The roof formed the self-stability structure, which satisfied safe coal mining under buildings, water bodies, and railways.https://www.mdpi.com/2076-3417/12/23/12114backfilling coal miningstrikediproof self-stabilitycooperative roof control |
| spellingShingle | Qiang Zhang Kang Yang Jixiong Zhang Qi Wang Longfeng Yuan Zengzhu Shi Xiling Xu A Theoretical Model of Roof Self-Stability in Solid Backfilling Mining and Its Engineering Verification Applied Sciences backfilling coal mining strike dip roof self-stability cooperative roof control |
| title | A Theoretical Model of Roof Self-Stability in Solid Backfilling Mining and Its Engineering Verification |
| title_full | A Theoretical Model of Roof Self-Stability in Solid Backfilling Mining and Its Engineering Verification |
| title_fullStr | A Theoretical Model of Roof Self-Stability in Solid Backfilling Mining and Its Engineering Verification |
| title_full_unstemmed | A Theoretical Model of Roof Self-Stability in Solid Backfilling Mining and Its Engineering Verification |
| title_short | A Theoretical Model of Roof Self-Stability in Solid Backfilling Mining and Its Engineering Verification |
| title_sort | theoretical model of roof self stability in solid backfilling mining and its engineering verification |
| topic | backfilling coal mining strike dip roof self-stability cooperative roof control |
| url | https://www.mdpi.com/2076-3417/12/23/12114 |
| work_keys_str_mv | AT qiangzhang atheoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT kangyang atheoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT jixiongzhang atheoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT qiwang atheoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT longfengyuan atheoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT zengzhushi atheoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT xilingxu atheoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT qiangzhang theoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT kangyang theoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT jixiongzhang theoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT qiwang theoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT longfengyuan theoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT zengzhushi theoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification AT xilingxu theoreticalmodelofroofselfstabilityinsolidbackfillingmininganditsengineeringverification |