Research on mechanical properties of U-shaped retractable gangue prevention structure of gob-side entry by roof cutting and pressure releasing in deep mining

In recent years, as a new type of gob-side entry retaining method, roadway automatically formed by roof cutting and pressure releasing (RAFRCPR) has been widely used in China. Under the condition of deep mining, the deformation of the gangue rib of the automatically formed gob-side entry retaining i...

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Bibliographic Details
Published inLithosphere Vol. 2021; no. Special 4
Main Authors Wang Fengnian, Wang Fengnian, Yin Songyang, Yin Songyang, Huo Shusen, Huo Shusen, Tao Zhigang, Tao Zhigang
Format Journal Article
LanguageEnglish
Published GeoScienceWorld 2022
Subjects
Asia
Chengjiao Mine
China
coal
coal mines
deformation
Economic geology
energy sources
Engineering geology
experimental studies
Far East
gangue
gob-side entry
Henan China
laboratory studies
mines
mining geology
numerical models
pressure
pressure release
retaining rib
retaining walls
roads
rock mechanics
roof control
sedimentary rocks
simulation
walls
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Summary:In recent years, as a new type of gob-side entry retaining method, roadway automatically formed by roof cutting and pressure releasing (RAFRCPR) has been widely used in China. Under the condition of deep mining, the deformation of the gangue rib of the automatically formed gob-side entry retaining is difficult to control, and it is difficult for the traditional I-shaped steel to provide the needed support. To effectively control the deformation of the gangue rib, a new type of U-shaped retractable gangue prevention structure (URGPS) with high lateral support strength and axial compressible dynamic absorption energy is proposed. Based on the geological conditions of the 21304-working face in the Chengjiao coal mine in Henan, the mechanical characteristics of URGPS and the causes of its local instability are analyzed in detail employing theoretical analysis, laboratory tests, and numerical simulation. A reasonable bolt tightening force, overlap length, and lap combination form of the URGPS are determined according to the actual situation of the project site. Engineering practice shows that a URGPS that was applied to control the deformation of the gangue rib in deep roof-cutting roadway was effective.
ISSN:1941-8264
1947-4253
DOI:10.2113/2022/1288090