Method of no-pillar mining with gob-entry retaining adapted for fully-mechanized top coal caving in thick coal seam
US12037905B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2020 |
| Grant date | Jul 16, 2024 |
| Priority date | — |
| Expiry date | Aug 23, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D20/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present disclosure relates to a technical field of coal mining, particularly to a method of no-pillar mining with gob-entry retaining adapted for fully-mechanized top coal caving in a thick coal seam, which comprises the following steps: reinforcing support on a roof and two sides of a roadway; performing roof slitting blasting to form a pre-splitting slit; erecting a temporary support device and a gangue retaining device in the roadway along the retained entry; performing no caving within a range of a preset distance at an end of the working face near the retained entry side; and removing the temporary support device in the roadway after entry forming stabilizes, and closing the goaf to complete entry retaining. The roof slitting blasting is more beneficial to collapse of strata in the goaf, so that the strata in the slit can better fill stoping space after collapse, and the roof of the retained entry forms a short arm beam structure laterally, which avoids forming a long suspended roof in the goaf, and improves the stress of surrounding rock of gob-side entry retaining; coal caving is not performed in a certain range at the end of the working face of the retained entry side, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.