煤体加载过程中声波波速变化规律实验研究

李祥春; 聂百胜; 杨春丽; 毛燕军

煤体加载过程中声波波速变化规律实验研究

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- 发布日期: 2016-01-19

Law of Acoustic Wave Velocity Change in Coal During Loading

摘要

摘要: 利用自制的声波参数测试系统实验研究了煤体加载过程中声波波速变化规律。研究结果表明：随着加载过程轴压或者围压的增大，试样的纵横波速表现出非线性增大趋势，并且波速增大过程中有明显的阶段化特征，最后趋于稳定；试样在受力加载过程中，试样纵横波波速比逐渐减小；建立了应力和纵波波速的关系式，理论分析表明，随着应力的增加，孔隙度减小，颗粒间的接触面积增大，引起波速的增大。
- 煤体加载 /
- 应力 /
- 波速 /
- 纵波 /
- 横波
Abstract: The law of acoustic wave velocity change in coal during loading is studied by the use of self-made acoustic parameter test system. The research results show that during loading with the increase of axial compression or confining pressure, the nonlinear increasing of the longitudinal and transverse wave velocity in coal sample can be got. And the phase characteristics can be seen significantly in the process of wave velocity increase and finally the value of wave velocity remains stable. During loading, the longitudinal and transverse wave ratio decreases. The relation between the stress and the longitudinal wave is established and it can be known from theoretical analysis that with the increase of stress， the porosity decreases and the contact area between particles increases, which causes the increase of velocity.
- coal body loading /
- stress /
- wave velocity /
- longitudinal wave /
- transverse wave

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煤体加载过程中声波波速变化规律实验研究

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Law of Acoustic Wave Velocity Change in Coal During Loading

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出版历程

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