Experimental research on influence mechanism of loading rates on rock pressure stimulated currents

Min Li ¹Zhijun Lin ²Shiliang Shi ²Deming Wang ³Yi Lu ²He Li ²Qing Ye ²Xiaonan Zhang²

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作者信息

1. School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China
2. School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China
3. School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China
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Abstract

The study of pressure stimulated current(PSC)changes of rocks is significant to monitor dynamic disas-ters in mines and rock masses.The existing studies focus on change laws and mechanism of currents gen-erated under the loading of rocks.An electrical and mechanics test system was established in this paper to explore the impacts of loading rates on PSCs.The results indicated that PSC curves of different rocks had different change laws under low/high loading rates.When the loading rate was relatively low,PSC curves firstly changed gently and then increased exponentially.Under high loading rates,PSC curves experienced the rapid increase stage,gentle increase stage and sudden change stage.The compressive strength could greatly affect the peak PSC in case of rock failure.The loading rate was a key factor in aver-age PSC.Under low loading rates,the variations of PSCs conformed to the damage charge model of frac-ture mechanics,while they did not at the fracture moment.Under high loading rates,the PSCs at low stress didn't fit the model due to the stress impact effects.The experimental results could provide theo-retical basis for the influence of loading rates on PSCs.

Key words

Pressure stimulated current/Loading rate/Influence mechanism/Peak current

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基金项目

Research Fund of the State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology(SKLCRSM22KF011)

National Natural Science Foundation of China(52130411)

National Natural Science Foundation of China(52104191)

National Natural Science Foundation of China(51974120)

National Natural Science Foundation of China(51904103)

Natural Science Foundation of Hunan Province(2021JJ40204)

Science and Technology Innovation Program of Hunan Province(2020RC3047)

出版年

2023

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI

影响因子：1.222

ISSN：2095-2686

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