Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement
A thin basement coal seam mining model under different overlying strata conditions was developed using the discrete element software UDEC. This approach is used to discuss the safety mining of the thin basement coal seams. Fracture development in overlying and rock strata movement law in the stope w...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/3210420 |
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| author | Min Tu Jinlong Cai Hualei Zhang Chuanxin Rong |
| author_facet | Min Tu Jinlong Cai Hualei Zhang Chuanxin Rong |
| author_sort | Min Tu |
| collection | DOAJ |
| description | A thin basement coal seam mining model under different overlying strata conditions was developed using the discrete element software UDEC. This approach is used to discuss the safety mining of the thin basement coal seams. Fracture development in overlying and rock strata movement law in the stope was discussed. The relationship between support and surrounding rocks under different overlying strata conditions was analyzed. Lastly, a field industrial test was conducted based on the research results. A few major conclusions could be drawn. Under load transmission in loose water-bearing strata, causing a large-scaled rock strata movement to advance into the working face is easy when only one bearing stratum exists in the overlying strata. Meanwhile, the support bears strong loads, which can easily be collapsed. When two bearing strata exist in the overlying one, the upper bearing stratum can form a voussoir beam structure. Loads on the support decreased substantially compared with those under single bearing stratum, whilst the probability of pressing frame was reduced accordingly. A weathered zone above the stope was reinforced by ground J-type drilling pregrouting, thereby improving the physical and mechanical properties and increasing the bearing capacity of the rock strata in the grouting range and safety mining of the working face in the lower coal seams. Research results provide important references for the safety mining of thin basement coal seams under similar conditions. |
| format | Article |
| id | doaj-art-cc84f22aeacd4eb8813bbee97d84d0cc |
| institution | OA Journals |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
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| series | Advances in Civil Engineering |
| spelling | doaj-art-cc84f22aeacd4eb8813bbee97d84d0cc2025-08-20T02:19:58ZengWileyAdvances in Civil Engineering1687-80861687-80942018-01-01201810.1155/2018/32104203210420Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting ReinforcementMin Tu0Jinlong Cai1Hualei Zhang2Chuanxin Rong3Provincial Co-Construction, Key Laboratory of Ministry of Education for High-Efficiency Safety Mining of Coal Mines, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaProvincial Co-Construction, Key Laboratory of Ministry of Education for High-Efficiency Safety Mining of Coal Mines, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaProvincial Co-Construction, Key Laboratory of Ministry of Education for High-Efficiency Safety Mining of Coal Mines, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaProvincial Co-Construction, Key Laboratory of Ministry of Education for High-Efficiency Safety Mining of Coal Mines, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaA thin basement coal seam mining model under different overlying strata conditions was developed using the discrete element software UDEC. This approach is used to discuss the safety mining of the thin basement coal seams. Fracture development in overlying and rock strata movement law in the stope was discussed. The relationship between support and surrounding rocks under different overlying strata conditions was analyzed. Lastly, a field industrial test was conducted based on the research results. A few major conclusions could be drawn. Under load transmission in loose water-bearing strata, causing a large-scaled rock strata movement to advance into the working face is easy when only one bearing stratum exists in the overlying strata. Meanwhile, the support bears strong loads, which can easily be collapsed. When two bearing strata exist in the overlying one, the upper bearing stratum can form a voussoir beam structure. Loads on the support decreased substantially compared with those under single bearing stratum, whilst the probability of pressing frame was reduced accordingly. A weathered zone above the stope was reinforced by ground J-type drilling pregrouting, thereby improving the physical and mechanical properties and increasing the bearing capacity of the rock strata in the grouting range and safety mining of the working face in the lower coal seams. Research results provide important references for the safety mining of thin basement coal seams under similar conditions.http://dx.doi.org/10.1155/2018/3210420 |
| spellingShingle | Min Tu Jinlong Cai Hualei Zhang Chuanxin Rong Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement Advances in Civil Engineering |
| title | Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement |
| title_full | Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement |
| title_fullStr | Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement |
| title_full_unstemmed | Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement |
| title_short | Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement |
| title_sort | safety mining technology of coal seams in weathered zone based on ground j type pregrouting reinforcement |
| url | http://dx.doi.org/10.1155/2018/3210420 |
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