Comparative study of model tests on automatically formed roadway and gob-side entry driving in deep coal mines
| Autor: | Manchao He, Jiang Zhenhua, Yue Wang, Shucai Li, Bei Jiang, Qin Qian, Qi Wang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Roadway control
0211 other engineering and technologies Abutment Energy Engineering and Power Technology 02 engineering and technology Deformation (meteorology) Stress (mechanics) 020401 chemical engineering Mining engineering Geochemistry and Petrology Coal 0204 chemical engineering Model test Roof 021101 geological & geomatics engineering Stress concentration Roof cutting Mining engineering. Metallurgy business.industry TN1-997 Coal mining Excavation Bolt grouting Geotechnical Engineering and Engineering Geology Automatically formed roadway business Geology |
| Zdroj: | International Journal of Mining Science and Technology, Vol 31, Iss 4, Pp 591-601 (2021) |
| ISSN: | 2095-2686 |
| Popis: | Automatically formed roadway (AFR) by roof cutting with bolt grouting (RCBG) is a new deep coal mining technology. By using this technology, the broken roadway roof is strengthened, and roof cutting is applied to cut off stress transfer between the roadway and gob to ensure the collapse of the overlying strata. The roadway is automatically formed owing to the broken expansion characteristics of the collapsed strata and mining pressure. Taking the Suncun Coal Mine as the engineering background, the control effect of this new technology on roadways was studied. To compare the law of stress evolution and the surrounding rock control mechanisms between AFR and traditional gob-side entry driving, a comparative study of geomechanical model tests on the above methods was carried out. The results showed that the new technology of AFR by RCBG effectively reduced the stress concentration of the roadway compared with gob-side entry driving. The side abutment pressure peak of the solid coal side was reduced by 24.3%, which showed an obvious pressure-releasing effect. Moreover, the position of the side abutment pressure peak was far from the solid coal side, making it more beneficial for roadway stability. The deformation of AFR surrounding rock was also smaller than the deformation of the gob-side entry driving by the overload test. The former was more beneficial for roadway stability than the latter under higher stress conditions. Field application tests showed that the new technology can effectively control roadway deformation. Moreover, the technology reduced roadway excavation and avoided resource waste caused by reserved coal pillars. |
| Databáze: | OpenAIRE |
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