Improving coal recovery from longwall top coal caving
This paper develops a series of methodologies to improve the recovery rate from longwall top coal caving. Cavability of top coal is the most essential indicator to estimate the recovery rate. Some influencing factors of cavability such as unconfined compressive strength, abutment pressure and thickn...
| Main Authors: | , |
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| Format: | Journal Article |
| Published: |
INSIO Scientific Books and Periodicals
2014
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/43218 |
| _version_ | 1848756629590245376 |
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| author | Ghosh, Apurna Gong, Y. |
| author_facet | Ghosh, Apurna Gong, Y. |
| author_sort | Ghosh, Apurna |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | This paper develops a series of methodologies to improve the recovery rate from longwall top coal caving. Cavability of top coal is the most essential indicator to estimate the recovery rate. Some influencing factors of cavability such as unconfined compressive strength, abutment pressure and thickness of top coal are primarily analysed to provide cavability assessment. The methodologies of how to determine the most effective drawing interval and cutting to drawing height ratio are developed to improve the recovery rate of top coal. Drawing interval can be determined as the advancing distance of hydraulic support between two caving processes. Both drawing interval and cutting to drawing height ratio can be artificially altered to the optimized value to improve the recovery rate. Three blasting patterns including five-hole scheme, rectangular scheme and triangular scheme are analysed to determine the most effective pattern for top coal caving. Arch structure formed in the caving process is another reason of causing a low recovery rate. In order to improve the recovery rate, a new method of vibration technique is analysed in this paper to break the arch structure. |
| first_indexed | 2025-11-14T09:15:14Z |
| format | Journal Article |
| id | curtin-20.500.11937-43218 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:15:14Z |
| publishDate | 2014 |
| publisher | INSIO Scientific Books and Periodicals |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-432182017-01-30T15:05:52Z Improving coal recovery from longwall top coal caving Ghosh, Apurna Gong, Y. Drawing interval Cavability Yield Abutment Top coal caving Longwall This paper develops a series of methodologies to improve the recovery rate from longwall top coal caving. Cavability of top coal is the most essential indicator to estimate the recovery rate. Some influencing factors of cavability such as unconfined compressive strength, abutment pressure and thickness of top coal are primarily analysed to provide cavability assessment. The methodologies of how to determine the most effective drawing interval and cutting to drawing height ratio are developed to improve the recovery rate of top coal. Drawing interval can be determined as the advancing distance of hydraulic support between two caving processes. Both drawing interval and cutting to drawing height ratio can be artificially altered to the optimized value to improve the recovery rate. Three blasting patterns including five-hole scheme, rectangular scheme and triangular scheme are analysed to determine the most effective pattern for top coal caving. Arch structure formed in the caving process is another reason of causing a low recovery rate. In order to improve the recovery rate, a new method of vibration technique is analysed in this paper to break the arch structure. 2014 Journal Article http://hdl.handle.net/20.500.11937/43218 INSIO Scientific Books and Periodicals restricted |
| spellingShingle | Drawing interval Cavability Yield Abutment Top coal caving Longwall Ghosh, Apurna Gong, Y. Improving coal recovery from longwall top coal caving |
| title | Improving coal recovery from longwall top coal caving |
| title_full | Improving coal recovery from longwall top coal caving |
| title_fullStr | Improving coal recovery from longwall top coal caving |
| title_full_unstemmed | Improving coal recovery from longwall top coal caving |
| title_short | Improving coal recovery from longwall top coal caving |
| title_sort | improving coal recovery from longwall top coal caving |
| topic | Drawing interval Cavability Yield Abutment Top coal caving Longwall |
| url | http://hdl.handle.net/20.500.11937/43218 |