Experimental Investigations on Charge Induction and Microseismic Characteristics of the Coal and Rock under Different Loading Rates

The research on charge induction and microseismic characteristics of coal and rock under different loading rates is of great significance for rockburst prediction. In this study, the coal and sandstone samples from the No. 11 mine of Pingdingshan Coal Mine are prepared. The charge induction and micr...

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Autores principales:	Yuchun Liu, Ling Ding, Yangfeng Zhao, Yi Fan, Hongfei Li
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/71a8e08030874ff09d3139c29735de85
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spelling	oai:doaj.org-article:71a8e08030874ff09d3139c29735de852021-11-22T01:10:57ZExperimental Investigations on Charge Induction and Microseismic Characteristics of the Coal and Rock under Different Loading Rates1875-920310.1155/2021/6242075https://doaj.org/article/71a8e08030874ff09d3139c29735de852021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/6242075https://doaj.org/toc/1875-9203The research on charge induction and microseismic characteristics of coal and rock under different loading rates is of great significance for rockburst prediction. In this study, the coal and sandstone samples from the No. 11 mine of Pingdingshan Coal Mine are prepared. The charge induction and microseismic synchronous comprehensive monitoring system is built. The uniaxial compression tests of coal and sandstone samples under the different loading rates are conducted. The charge induction and microseismic signal characteristics in the deformation and fracture process of the coal and rock under the different loading rates are studied. The results show that, with the increase of loading rate, the compressive strength of the coal and rock samples increases and the time from the peak stress to instability failure becomes shorter. At the same loading rate, the softening failure stage time of coal is longer than that of sandstone. With the increase of loading rate, the duration of charge-induced signal and microseismic signal is longer and the events’ number and amplitude of charge signal and microseismic signal increase in the deformation and fracture process of the coal and rock. Before the instability failure, the charge-induced signal and microseismic signal have both synchronous and asynchronous signals, and the amplitude of charge-induced and microseismic signals in each channel is different, which is related to the distance from the position of each sensor to the fracture point of the sample. During the instability failure, the charge induction and microseismic signals of each channel are generated synchronously, and the signal amplitude reaches the maximum values of 50 pC and 6 × 10−3 m/s at the same time. With the increase of specimen stress, the dominant frequency of microseismic signals first increases and then decreases, while the amplitude of dominant frequency increases synchronously. The dominant frequency amplitude of microseismic signals is the largest in instability failure. With the increase of loading rate, the spectrum amplitude of microseismic signals changes little in the compaction stage, but the spectrum amplitude increases in other stages. At the same loading speed, the events’ number of the microseismic signal of coal samples after peak stress is more than that of sandstone samples, and the signal amplitude is also larger. However, the spectrum distribution range of microseismic signals of coal samples is wider than that of sandstone samples, and the spectrum amplitude of coal samples is lower than that of sandstone. With the increase of loading rate, the time of the first generation of high-amplitude signals is advanced, and the stress of specimen becomes smaller when the first generation of high-amplitude signals occurs. With the increase of loading rate, the duration of microseismic and charge signal is longer, and the mean square amplitude of charge signal is larger.Yuchun LiuLing DingYangfeng ZhaoYi FanHongfei LiHindawi LimitedarticlePhysicsQC1-999ENShock and Vibration, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Yuchun Liu Ling Ding Yangfeng Zhao Yi Fan Hongfei Li Experimental Investigations on Charge Induction and Microseismic Characteristics of the Coal and Rock under Different Loading Rates
description	The research on charge induction and microseismic characteristics of coal and rock under different loading rates is of great significance for rockburst prediction. In this study, the coal and sandstone samples from the No. 11 mine of Pingdingshan Coal Mine are prepared. The charge induction and microseismic synchronous comprehensive monitoring system is built. The uniaxial compression tests of coal and sandstone samples under the different loading rates are conducted. The charge induction and microseismic signal characteristics in the deformation and fracture process of the coal and rock under the different loading rates are studied. The results show that, with the increase of loading rate, the compressive strength of the coal and rock samples increases and the time from the peak stress to instability failure becomes shorter. At the same loading rate, the softening failure stage time of coal is longer than that of sandstone. With the increase of loading rate, the duration of charge-induced signal and microseismic signal is longer and the events’ number and amplitude of charge signal and microseismic signal increase in the deformation and fracture process of the coal and rock. Before the instability failure, the charge-induced signal and microseismic signal have both synchronous and asynchronous signals, and the amplitude of charge-induced and microseismic signals in each channel is different, which is related to the distance from the position of each sensor to the fracture point of the sample. During the instability failure, the charge induction and microseismic signals of each channel are generated synchronously, and the signal amplitude reaches the maximum values of 50 pC and 6 × 10−3 m/s at the same time. With the increase of specimen stress, the dominant frequency of microseismic signals first increases and then decreases, while the amplitude of dominant frequency increases synchronously. The dominant frequency amplitude of microseismic signals is the largest in instability failure. With the increase of loading rate, the spectrum amplitude of microseismic signals changes little in the compaction stage, but the spectrum amplitude increases in other stages. At the same loading speed, the events’ number of the microseismic signal of coal samples after peak stress is more than that of sandstone samples, and the signal amplitude is also larger. However, the spectrum distribution range of microseismic signals of coal samples is wider than that of sandstone samples, and the spectrum amplitude of coal samples is lower than that of sandstone. With the increase of loading rate, the time of the first generation of high-amplitude signals is advanced, and the stress of specimen becomes smaller when the first generation of high-amplitude signals occurs. With the increase of loading rate, the duration of microseismic and charge signal is longer, and the mean square amplitude of charge signal is larger.
format	article
author	Yuchun Liu Ling Ding Yangfeng Zhao Yi Fan Hongfei Li
author_facet	Yuchun Liu Ling Ding Yangfeng Zhao Yi Fan Hongfei Li
author_sort	Yuchun Liu
title	Experimental Investigations on Charge Induction and Microseismic Characteristics of the Coal and Rock under Different Loading Rates
title_short	Experimental Investigations on Charge Induction and Microseismic Characteristics of the Coal and Rock under Different Loading Rates
title_full	Experimental Investigations on Charge Induction and Microseismic Characteristics of the Coal and Rock under Different Loading Rates
title_fullStr	Experimental Investigations on Charge Induction and Microseismic Characteristics of the Coal and Rock under Different Loading Rates
title_full_unstemmed	Experimental Investigations on Charge Induction and Microseismic Characteristics of the Coal and Rock under Different Loading Rates
title_sort	experimental investigations on charge induction and microseismic characteristics of the coal and rock under different loading rates
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/71a8e08030874ff09d3139c29735de85
work_keys_str_mv	AT yuchunliu experimentalinvestigationsonchargeinductionandmicroseismiccharacteristicsofthecoalandrockunderdifferentloadingrates AT lingding experimentalinvestigationsonchargeinductionandmicroseismiccharacteristicsofthecoalandrockunderdifferentloadingrates AT yangfengzhao experimentalinvestigationsonchargeinductionandmicroseismiccharacteristicsofthecoalandrockunderdifferentloadingrates AT yifan experimentalinvestigationsonchargeinductionandmicroseismiccharacteristicsofthecoalandrockunderdifferentloadingrates AT hongfeili experimentalinvestigationsonchargeinductionandmicroseismiccharacteristicsofthecoalandrockunderdifferentloadingrates
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Experimental Investigations on Charge Induction and Microseismic Characteristics of the Coal and Rock under Different Loading Rates

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