Study on temporal and spatial response of pressure stimulated current induced by coal deformation and rupture

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Applied Geophysics Pub Date : 2024-07-01 DOI:10.1016/j.jappgeo.2024.105441

Quancong Zhang , Zhonghui Li , Xin Zhang , Shan Yin , Niu Yue

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引用次数: 0

Abstract

The pressure stimulated current (PSC) signal emitted during the deformation and fracture processes of coal and rock materials holds significant importance for monitoring dynamic disasters in coal mines. However, the spatial response characteristics remain inadequately explored, posing significant challenges to the identification of risk-prone areas for underground dynamic disasters. To study the temporal and spatial response characteristics of PSC signal, the PSC response experiment in the failure process of raw coal under load was carried out, PSC signals from various spatial positions of coal were collected throughout the loading process. The results show that the sudden increase of axial PSC and the sudden decrease of transverse PSC appear with the sudden increase of acoustic emission (AE) hit rates, which is the main characteristic of the aggravation of coal internal fracture degree. The PSCs are closely related to the damage characteristics of the sample in terms of its corresponding position and drop time, which can better reflect the fracture concentration location of the coal sample. Building upon this foundation, the paper explained the internal factors contributing to variations in PSC spatial response characteristics of coal samples during load failure and emphasizes the inhibitory effect of crack development on PSC changes.

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煤炭变形和破裂诱发的压力刺激电流时空响应研究

煤炭和岩石材料在变形和断裂过程中发出的压力刺激电流（PSC）信号对于监测煤矿动态灾害具有重要意义。然而，对其空间响应特征的研究仍显不足，这给井下动力灾害风险易发区的识别带来了巨大挑战。为了研究 PSC 信号的时空响应特性，我们进行了原煤在加载作用下失效过程中的 PSC 响应实验，在整个加载过程中采集了煤的不同空间位置的 PSC 信号。结果表明，随着声发射（AE）命中率的突然增大，出现了轴向 PSC 的突然增大和横向 PSC 的突然减小，这是煤炭内部断裂程度加剧的主要特征。PSCs与煤样损伤特征的对应位置和下落时间密切相关，能较好地反映煤样的断裂集中位置。在此基础上，本文阐述了煤样在载荷破坏过程中PSC空间响应特征变化的内在因素，并强调了裂纹发展对PSC变化的抑制作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Geophysics 地学-地球科学综合

CiteScore

3.60

自引率

10.00%

发文量

274

审稿时长

4 months

期刊介绍： The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.