Influence of Bidirectional Impact Loading on Anomalously Low-Friction Effect in Block Rock Media

The anomalously low-friction effect is a key scientific problem in deep mining. The deep coal rock media is usually a block structure with joint fracture. When the deep block coal rock is subjected to repeated strong dynamic impact caused by long-term excavation activities, the anomalously low-frict...

Full description

Saved in:
Bibliographic Details
Main Authors: Liping Li, Weijun Li, Jupeng Tang, Jiaqing Lv
Format: Article
Language:English
Published: Wiley 2018-01-01
Series:Advances in Civil Engineering
Online Access:http://dx.doi.org/10.1155/2018/9156304
Tags: Add Tag
No Tags, Be the first to tag this record!
_version_ 1832546011430518784
author Liping Li
Weijun Li
Jupeng Tang
Jiaqing Lv
author_facet Liping Li
Weijun Li
Jupeng Tang
Jiaqing Lv
author_sort Liping Li
collection DOAJ
description The anomalously low-friction effect is a key scientific problem in deep mining. The deep coal rock media is usually a block structure with joint fracture. When the deep block coal rock is subjected to repeated strong dynamic impact caused by long-term excavation activities, the anomalously low-friction effect will occur, resulting in dynamic disasters such as rock bursts. Taking granite block rock media as research object and using bidirectional impact loading to simulate the dynamic disturbance of rock media, a numerical model was established. The vertical acceleration and the horizontal displacement on working block media were defined as the characteristic parameters of the anomalously low-friction effect. The effects of delay time and horizontal impact loading amplitude and frequency on the characteristic parameters under bidirectional impact loading were examined by numerical simulation. The generation and variation of the anomalously low-friction effect of block rock media subjected to bidirectional impact loading were presented. The results show that the delay time has a significant effect to the vertical acceleration amplitude and horizontal displacement on the working block media under bidirectional impact loading. There exists a delay time threshold; when reach to the threshold, quasiresonance and the anomalously low-friction effect on block media will easily occur. With the increase in horizontal impact amplitude, the residual horizontal displacement on the working block media also increases by power function, while it decreases by power function with the increase of horizontal impact loading frequency. Finally, this study denotes that it is great significance to investigate the bidirectional impact loading in order to capture the mechanism of anomalously low-friction effect.
format Article
id doaj-art-b94b2c69f9584158bdd35262b59e3645
institution Kabale University
issn 1687-8086
1687-8094
language English
publishDate 2018-01-01
publisher Wiley
record_format Article
series Advances in Civil Engineering
spelling doaj-art-b94b2c69f9584158bdd35262b59e36452025-02-03T07:24:12ZengWileyAdvances in Civil Engineering1687-80861687-80942018-01-01201810.1155/2018/91563049156304Influence of Bidirectional Impact Loading on Anomalously Low-Friction Effect in Block Rock MediaLiping Li0Weijun Li1Jupeng Tang2Jiaqing Lv3School of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, ChinaSchool of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, ChinaSchool of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, ChinaSchool of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, ChinaThe anomalously low-friction effect is a key scientific problem in deep mining. The deep coal rock media is usually a block structure with joint fracture. When the deep block coal rock is subjected to repeated strong dynamic impact caused by long-term excavation activities, the anomalously low-friction effect will occur, resulting in dynamic disasters such as rock bursts. Taking granite block rock media as research object and using bidirectional impact loading to simulate the dynamic disturbance of rock media, a numerical model was established. The vertical acceleration and the horizontal displacement on working block media were defined as the characteristic parameters of the anomalously low-friction effect. The effects of delay time and horizontal impact loading amplitude and frequency on the characteristic parameters under bidirectional impact loading were examined by numerical simulation. The generation and variation of the anomalously low-friction effect of block rock media subjected to bidirectional impact loading were presented. The results show that the delay time has a significant effect to the vertical acceleration amplitude and horizontal displacement on the working block media under bidirectional impact loading. There exists a delay time threshold; when reach to the threshold, quasiresonance and the anomalously low-friction effect on block media will easily occur. With the increase in horizontal impact amplitude, the residual horizontal displacement on the working block media also increases by power function, while it decreases by power function with the increase of horizontal impact loading frequency. Finally, this study denotes that it is great significance to investigate the bidirectional impact loading in order to capture the mechanism of anomalously low-friction effect.http://dx.doi.org/10.1155/2018/9156304
spellingShingle Liping Li
Weijun Li
Jupeng Tang
Jiaqing Lv
Influence of Bidirectional Impact Loading on Anomalously Low-Friction Effect in Block Rock Media
Advances in Civil Engineering
title Influence of Bidirectional Impact Loading on Anomalously Low-Friction Effect in Block Rock Media
title_full Influence of Bidirectional Impact Loading on Anomalously Low-Friction Effect in Block Rock Media
title_fullStr Influence of Bidirectional Impact Loading on Anomalously Low-Friction Effect in Block Rock Media
title_full_unstemmed Influence of Bidirectional Impact Loading on Anomalously Low-Friction Effect in Block Rock Media
title_short Influence of Bidirectional Impact Loading on Anomalously Low-Friction Effect in Block Rock Media
title_sort influence of bidirectional impact loading on anomalously low friction effect in block rock media
url http://dx.doi.org/10.1155/2018/9156304
work_keys_str_mv AT lipingli influenceofbidirectionalimpactloadingonanomalouslylowfrictioneffectinblockrockmedia
AT weijunli influenceofbidirectionalimpactloadingonanomalouslylowfrictioneffectinblockrockmedia
AT jupengtang influenceofbidirectionalimpactloadingonanomalouslylowfrictioneffectinblockrockmedia
AT jiaqinglv influenceofbidirectionalimpactloadingonanomalouslylowfrictioneffectinblockrockmedia