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公开(公告)号：US20210355826A1
公开(公告)日：2021-11-18
申请号：US16613926
申请日：2018-09-20
Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Inventor： Nan Zhou , Meng Li , Hao Yan , Jixiong Zhang , Hengfeng Liu
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.
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公开(公告)号：US11021954B2
公开(公告)日：2021-06-01
申请号：US16763426
申请日：2019-02-22
Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Inventor： Nan Zhou , Hengfeng Liu , Meng Li , Zhongya Wu , Jixiong Zhang
Abstract: A method of recovering a room-and-pillar coal pillar by using external replacement supports. In the recovery of a room-and-pillar coal pillar, a cement material wall is formed by performing pouring around a coal pillar having a width to height ratio of less than 0.6, by means of a single-pillar sack arrangement technique, such that a coal pillar resource may be mined while a wall made from a cement filling material supports an overlying stratum. After mining is complete, a coal pillar goaf region is filled with the cement filling material, and after the cement filling material solidifies and is stable, the single pillar can be recovered.
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公开(公告)号：US11339658B2
公开(公告)日：2022-05-24
申请号：US16613926
申请日：2018-09-20
Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Inventor： Nan Zhou , Meng Li , Hao Yan , Jixiong Zhang , Hengfeng Liu
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.
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