Microseismic precursor response characteristics of rockburst in the super-long working face: A case study

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-11-01 DOI:10.1016/j.jappgeo.2024.105550
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Abstract

Rockburst is one of the significant dynamic hazards of coal and rock bodies during super-long working face mining. Microseismic (MS) technology has been widely used to monitor the dynamic hazards of coal and rock bodies. By analyzing the parameters and statistics of seismic events, the level of rock burst hazard can be assessed. Then, the prevention and control measures taken in advance in the working face should be guided to reduce the impact damage. This study analyzed the precursor characteristics of rockburst MS signals in super-long working faces from spatial distribution, total daily energy, number of MS events, spectrograms, and b-value of MS signals. The results show that the MS events are mainly distributed in the coal seam roof three days before the occurrence of rockburst, the proportion of daily MS events in the coal seam roof increases, and the number of MS events shows a continuous decline. The proportion of large energy MS signals is higher than that of conventional and inclined seam workings in super-long workings before rockbursts; the amplitude of the MS signals from the super-long working face is large, the vibration duration is long (0.8–1.4 s) and the frequency is low; with the approach of rockburst, the low-energy frequency band tends to increase and the frequency decreases. The proportion of the low-energy frequency band (0–40 Hz) of the precursor of impact ground pressure is high. The main frequency of the MS signal of the super-long working face is lower than that of the conventional working face and the inclined coal seam working face when the rockburst occurs; rockburst often occurs in the b-value decreasing stage, and the number of MS events and b-value changes before the rockburst shows the same downward trend, rockburst occurs when the occurrence of the b-value is less than 0.8. The study results for the safety of the super-long working face mining back to provide a scientific basis.
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超长工作面岩爆的微震前兆响应特征:案例研究
岩爆是超长工作面开采过程中煤体和岩体的重要动态危险之一。微震(MS)技术已被广泛用于监测煤体和岩体的动态危险。通过分析地震事件的参数和统计数据,可以评估岩爆危害程度。进而指导工作面提前采取防治措施,减少冲击破坏。本研究从空间分布、日总能量、MS 事件数量、频谱图和 MS 信号 b 值等方面分析了超长工作面岩爆 MS 信号的前兆特征。结果表明,岩爆发生前三天,MS 事件主要分布在煤层顶板,煤层顶板日 MS 事件所占比例增大,MS 事件数量呈持续下降趋势。岩爆前超长工作面大能量 MS 信号所占比例高于常规工作面和倾斜工作面;超长工作面 MS 信号振幅大,振动持续时间长(0.8-1.4 s),频率低;随着岩爆的临近,低能量频段趋于增加,频率降低。冲击地压前兆低能频段(0-40 Hz)所占比例较高。岩爆发生时,超长工作面 MS 信号的主频低于常规工作面和倾斜煤层工作面;岩爆往往发生在 b 值下降阶段,岩爆前 MS 事件发生次数与 b 值变化呈同步下降趋势,岩爆发生时 b 值小于 0.8。该研究结果为超长工作面回采安全提供了科学依据。
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来源期刊
Journal of Applied Geophysics
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.
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