Internally injected replacement support room-type coal pillar recovery method

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United States of America

PATENT NO 11313226
APP PUB NO 20200378255A1
SERIAL NO

16603832

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Abstract

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An internally injected replacement support room-type coal pillar recovery method is provided. During the recovery, the room-type coal pillars with an aspect ratio greater than 0.6 are divided into two parts: reserved coal pillars and pre-mined coal pillars. After the mining of the pre-mined coal pillars, a cemented filling material is injected into a goaf surrounded by the reserved coal pillars, and is stabilized to replace the coal pillars for support, and the reserved coal pillars are recovered. A mechanical model of the reserved coal pillars in a support overburden stage is established based on the Winkler beam theory, to obtain displacement and stress conditions of a roof of the reserved coal pillar in a support stage. A theoretical reserve-width of the reserved coal pillars is obtained according to a first strength theory of the roof and a criterion of ultimate strength of the reserved coal pillars.

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Patent Owner(s)

  • CHINA UNIVERSITY OF MINING AND TECHNOLOGY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Li, Meng Jiangsu, CN 404 1854
Sun, Kai Jiangsu, CN 112 554
Wang, Jiaqi Jiangsu, CN 37 20
Zhang, Jixiong Jiangsu, CN 22 11
Zhou, Nan Jiangsu, CN 34 40

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