Deformation Mechanism and Control Technology of Surrounding Rock of Three-Soft Coal Roadways under High Horizontal Stress

Xiaoping Xie, Hongyang Liu (), Xinqiu Fang, Junwei Yang, Jiangang Liu, Minfu Liang and Gang Wu
Additional contact information
Xiaoping Xie: School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China
Hongyang Liu: School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China
Xinqiu Fang: School of Mining, China University of Mining and Technology, Xuzhou 221116, China
Junwei Yang: School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China
Jiangang Liu: School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China
Minfu Liang: School of Mining, China University of Mining and Technology, Xuzhou 221116, China
Gang Wu: School of Mining, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2023, vol. 16, issue 2, 1-23

Abstract: Support technology faces challenges in view of the large deformation of surrounding rock in three-soft coal roadways under high horizontal stress in Zijin Coal Mine, China. Geostress near the tested working face of the mine was measured and its distribution law was analyzed through theoretical analysis, numerical simulation analysis, and field measurement. The original supporting scheme of the three-soft coal roadway on the tested working face was analyzed to discover the deformation and failure mechanism of the surrounding rock of the original supporting roadway and the control measures. An optimized support scheme of H-G (hollow grouting) anchor cables, high strength bolts, W-shaped steel belts, metal meshes, and sprayed concretes was proposed for field applications. Based on the roadway in the tested 3201 working face at Zijin Coal Mine, the technical parameters for optimizing the combined support of the roadway were determined. The following results were be obtained through field measurement. The roadway was kept intact after excavation and the optimized support scheme was adopted in the three-soft coal roadway. No obvious deformation in appearance existed in the roof, floor, and roadway coal sides. Compared with the original support scheme, the stability of the roadways was improved visibly. The displacement of the roadway roof decreased from 100 to 30 mm, and that of the roadway coal walls decreased from more than 100 mm to less than 50 mm. This work verifies the effectiveness of a combined support scheme of H-G anchor cables, high strength bolts, W-shaped steel belts, metal meshes, and sprayed concretes to control deformations of surrounding rock in three-soft coal roadways. The new support scheme has good social and economic benefits and can be used as a reference for other roadway supports under similar conditions.

Keywords: high horizontal stress; three-soft coal roadways; geostress survey; surrounding rock deformations of roadways; H-G anchor cables (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/2/728/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/2/728/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:2:p:728-:d:1028729

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().