Affiliation:
1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China
Abstract
As an extra-thick hard roof is a significant contributing factor to frequently induced sudden roof collapse accidents and coal bursts, this study investigates the relationship between extra-thick hard roof movement and mining-induced stress using physical experiments and numerical simulation methods based on mining activities in a longwall panel in the Yima mining area, Henan province, China. The results suggested that the movement and failure processes of the extra-thick roof could be divided into three main periods: the undisturbed, movement stabilization, and sudden collapse periods. The roof displacement remained essentially unchanged during the undisturbed period. During the movement stabilization period, the displacement gradually increased into the upper roof. However, the extra-thick main roof remained undisturbed until the immediate roof experienced its fourth periodic caving in the physical model. Consequently, the displacement expanded rapidly into the extra-thick main roof during the sudden collapse period and the strain energy was violently released when it accumulated in the extra-thick main roof. Additionally, the mining-induced stress was characterized by a sudden decrease in the gradual increase trend when the extra-thick roof instantly collapsed. The deformation and fracture of the extra-thick roof could cause a sudden decrease in the mining-induced stress and lead to continuous and unstable subsidence pressure exerted on the mining panel and roadway. This significantly contributes to the occurrence of coal bursts.
Funder
State Key Research Development Program of China
Subject
General Earth and Planetary Sciences
Reference43 articles.
1. State of the art review on mechanism and prevention of coal bumps in China;Y. D. Jiang;Journal of China Coal Society,2014
2. Research progress of precise risk accurate identification and monitoring early warning on typical dynamic disasters in coal mine;L. Yuan;Journal of China Coal Society,2018
3. State of the art: investigation on mechanism, forecast and control of coal bumps in China;Y. D. Jiang;Chinese Journal of Rock Mechanics and Engineering,2015
4. Characteristic of stress evolution on fault surface and coal bursts mechanism during the extraction of longwall face in Yima mining area, China
5. Investigation of Fault Displacement Evolution During Extraction in Longwall Panel in an Underground Coal Mine
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献