Method for recovering room-type coal pillars by cemented filling of reserved roadways
US11339658B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2018 |
| Grant date | May 24, 2022 |
| Priority date | — |
| Expiry date | Jul 1, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21F15/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Provided is a method for recovering room-type coal pillars by cemented filling of reserved roadways, which is especially suitable for safe and efficient recovery of left coal pillars in room-type mining faces in mining areas where the ecological system is fragile, such as in western China. In the method, by constructing reserved roadways in two adjacent rows of room-type goafs, excavating coal pillar roadways in room-type coal pillars, and finally interconnecting the reserved roadways with the coal pillar roadways to form a U-shaped working face, room-type left coal pillars are recovered. Thus, not only the workload of roadway excavation is reduced, but also the recovery ratio of the coal resources is maximized. The method provides a novel technical model for the recovery of room-type left coal pillars in mining areas, such as in western China.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.