Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China

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...

Full description

Saved in:
Bibliographic Details
Main Authors: Hongwei Wang, Daixin Deng, Ruiming Shi, Guozhen Yang, Shuo Xu, Yaodong Jiang
Format: Article
Language:English
Published: Wiley 2021-01-01
Series:Geofluids
Online Access:http://dx.doi.org/10.1155/2021/4092242
Tags: Add Tag
No Tags, Be the first to tag this record!
_version_ 1832560102916227072
author Hongwei Wang
Daixin Deng
Ruiming Shi
Guozhen Yang
Shuo Xu
Yaodong Jiang
author_facet Hongwei Wang
Daixin Deng
Ruiming Shi
Guozhen Yang
Shuo Xu
Yaodong Jiang
author_sort Hongwei Wang
collection DOAJ
description 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.
format Article
id doaj-art-4769cdeaf4e64bafb72ae0a6109ba3fd
institution Kabale University
issn 1468-8115
1468-8123
language English
publishDate 2021-01-01
publisher Wiley
record_format Article
series Geofluids
spelling doaj-art-4769cdeaf4e64bafb72ae0a6109ba3fd2025-02-03T01:28:19ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/40922424092242Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, ChinaHongwei Wang0Daixin Deng1Ruiming Shi2Guozhen Yang3Shuo Xu4Yaodong Jiang5School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, ChinaAs 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.http://dx.doi.org/10.1155/2021/4092242
spellingShingle Hongwei Wang
Daixin Deng
Ruiming Shi
Guozhen Yang
Shuo Xu
Yaodong Jiang
Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China
Geofluids
title Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China
title_full Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China
title_fullStr Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China
title_full_unstemmed Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China
title_short Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China
title_sort investigation on the movement and fracture characteristics of an extra thick hard roof during longwall panel extraction in the yima mining area china
url http://dx.doi.org/10.1155/2021/4092242
work_keys_str_mv AT hongweiwang investigationonthemovementandfracturecharacteristicsofanextrathickhardroofduringlongwallpanelextractionintheyimaminingareachina
AT daixindeng investigationonthemovementandfracturecharacteristicsofanextrathickhardroofduringlongwallpanelextractionintheyimaminingareachina
AT ruimingshi investigationonthemovementandfracturecharacteristicsofanextrathickhardroofduringlongwallpanelextractionintheyimaminingareachina
AT guozhenyang investigationonthemovementandfracturecharacteristicsofanextrathickhardroofduringlongwallpanelextractionintheyimaminingareachina
AT shuoxu investigationonthemovementandfracturecharacteristicsofanextrathickhardroofduringlongwallpanelextractionintheyimaminingareachina
AT yaodongjiang investigationonthemovementandfracturecharacteristicsofanextrathickhardroofduringlongwallpanelextractionintheyimaminingareachina