THERMAL SCIENCE

International Scientific Journal

Hong-Bin Li

,

Dong-Yin Li

,

Hao Wang

,

Zhen-Feng Li

,

Shen Wang

,

Chun-Ling Chen

RESEARCH ON STRESS EVOLUTION LAW AND FAILURE CHARACTERISTICS OF TOP COAL IN FULLY MECHANIZED CAVING OF EXTRA-THICK COAL SEAMS

ABSTRACT
In this study, based on the engineering background of the No. 8222 working face of the Tashan coal mine in Shanxi Province, China, true triaxial experiments were carried out on Geotechnical Consulting and Testing Systems rock mechanics testing machine using cubic coal samples, and the numerical simulation was conducted through the FLAC3D software. Moreover, the stress evolution law of different layers of extra-thick coal seams and the failure mechanism of top coal in the fully mechanized caving were investigated, and the failure structure model of top coal was established. The results show that there are differences in the principal stress values at different layers of the top coal.
KEYWORDS
extra-thick coal seams, top coal caving, stress evolution, failure structure of top coal
PAPER SUBMITTED: 2022-08-15
PAPER REVISED: 2022-12-05
PAPER ACCEPTED: 2022-12-18
PUBLISHED ONLINE: 2023-03-04
DOI REFERENCE: https://doi.org/10.2298/TSCI2301687L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2023, VOLUME 27, ISSUE Issue 1, PAGES [687 - 695]
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Research on stress evolution law and failure characteristics of top coal in fully mechanized caving of extra-thick coal seams

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence