Characteristics of evolution of mining-induced stress field in the longwall panel: insights from physical modeling

The evolution of mining-induced stress field in longwall panel is closely related to the fracture field and the breaking characteristics of strata. Few laboratory experiments have been conducted to investigate the stress field. This study investigated its evolution by constructing a large-scale phys...

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Vydané v:International journal of coal science & technology Ročník 8; číslo 5; s. 938 - 955
Hlavní autori: Lou, Jinfu, Gao, Fuqiang, Yang, Jinghe, Ren, Yanfang, Li, Jianzhong, Wang, Xiaoqing, Yang, Lei
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Singapore Springer Singapore 01.10.2021
Springer
Springer Nature B.V
Predmet:
Analysis
Energy
Fossil Fuels (incl. Carbon Capture)
Geotechnical Engineering & Applied Earth Sciences
Mineral industry
Mineral Resources
Mining industry
Overburden
Research Article
Stress
Stress concentration
Theoretical analysis
China
Principal stress trajectory
Physical modeling
Mining-induced stress field
Strain brick
Longwall mining
ISSN:2095-8293, 2198-7823
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Shrnutí:The evolution of mining-induced stress field in longwall panel is closely related to the fracture field and the breaking characteristics of strata. Few laboratory experiments have been conducted to investigate the stress field. This study investigated its evolution by constructing a large-scale physical model according to the in situ conditions of the longwall panel. Theoretical analysis was used to reveal the mechanism of stress distribution in the overburden. The modelling results showed that: (1) The major principal stress field is arch-shaped, and the strata overlying both the solid zones and gob constitute a series of coordinated load-bearing structures. The stress increasing zone is like a macro stress arch. High stress is especially concentrated on both shoulders of the arch-shaped structure. The stress concentration of the solid zone in front of the gob is higher than the rear solid zone. (2) The characteristics of the vertical stress field in different regions are significantly different. Stress decreases in the zone above the gob and increases in solid zones on both sides of it. The mechanical analysis show that for a given stratum, the trajectories of principal stress are arch-shaped or inversely-arched, referred to as the “principal stress arch”, irrespective of its initial breaking or periodic breaking, and determines the fracture morphology. That is, the trajectories of tensile principal stress are inversely arched before the first breaking of the strata, and cause the breaking lines to resemble an inverted funnel. In case of periodic breaking, the breaking line forms an obtuse angle with the advancing direction of the panel. Good agreement was obtained between the results of physical modeling and the theoretical analysis.
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ISSN:2095-8293
2198-7823
DOI:10.1007/s40789-020-00390-5