含瓦斯煤岩复合结构在荷载作用下的声热响应特性及破坏模式

IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION
Yidie Zhang , Guorui Feng , Zhen Li , Zhiwei Wang , Dengke Wang , Yanqun Yang , Xiaohong Yang
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引用次数: 0

摘要

探索含瓦斯煤和岩石的不稳定性和破坏过程的特征对于监测和预测矿井瓦斯事故至关重要。因此,基于自主研发的瓦斯-固体耦合红外观测系统,模拟了真实的瓦斯环境。研究了含瓦斯煤岩复合结构的声热响应特征和破坏模式。结果表明(1) 从塑性阶段开始,煤的平均红外辐射温度显著升高。在达到峰值前约 30 s,组合体和煤的红外辐射温度差(VDIRT)开始发生变化,组合体的 b 值开始频繁波动,而岩石的 VDIRT 在整个过程中保持在 2.128 × 10-4 左右。(2) 当应力即将达到峰值时,煤和岩石之间形成了明显的温度边界。高能量声发射主要集中在界面和煤内部。(3) 早期塑性阶段主要是高频率、低振幅事件。在后峰值阶段和塑性晚期,振幅为 80-90 dB 的事件比例上升,低频、高振幅事件显著增加。(4) 随着加载的进行,密度和面积逐渐增大,并有向剪切裂纹区域移动的趋势。上升时间/振幅的分布范围从加载开始时的 0-12 ms/V 扩大到高峰后阶段的 0-60 ms/V。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Acoustic and thermal response characteristics and failure mode of gas-bearing coal–rock composite structure under loading

Exploring the characteristics of the instability and failure processes of gas-bearing coal and rock is crucial for monitoring and predicting mine gas accidents. Thus, a real gas environment was simulated based on a self-developed gas–solid coupling infrared observation system. The acoustic–thermal response characteristics and failure mode of the gas-bearing coal–rock composite structure were studied. The results showed the following: (1) From the plastic stage, the average infrared radiation temperature of the coal increased significantly. The variances of differential infrared temperature (VDIRT) of the combination and coal started to mutate approximately 30 s before the peak, and the b value of the combination began to fluctuate frequently, while the VDIRT of rock remained approximately 2.128 × 10−4 throughout the process. (2) When stress was about to peak, a clear temperature boundary formed between coal and rock. Acoustic emissions with high energy were mainly concentrated at the interface and inside the coal. (3) The early plastic stage was dominated by high-frequency, low-amplitude events. In the post-peak stage and late plastic stage, the proportion of events with 80–90 dB amplitude rose, and there was a significant increase in low-frequency, high-amplitude events. (4) As the loading proceeded, the density and area gradually increased and tended to move toward the shear crack region. The distribution range of the rise time/amplitude expanded from 0–12 ms/V at the beginning of the loading to the range of 0–60 ms/V in the post-peak stage.

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来源期刊
CiteScore
5.70
自引率
12.10%
发文量
400
审稿时长
67 days
期刊介绍: The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.
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