常规三轴压缩下含瓦斯水合物煤体能量变化规律研究

高　霞; 孟　伟; 吴　强; 张保勇

常规三轴压缩下含瓦斯水合物煤体能量变化规律研究

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- 发布日期: 2020-10-19

Energy Variation Rules of Gas Hydrate-bearing Coal Under Conventional Triaxial Compression

摘要

摘要: 基于常规三轴压缩下含瓦斯水合物煤体的偏应力-应变曲线,结合热力学第一定律,研究含瓦斯水合物煤体变形破坏过程中能量变化规律。研究表明:含瓦斯水合物煤体变形破坏过程中以峰前弹性应变能为主导转化为峰后耗散能为主导;所吸收的总能量、弹性应变能、耗散能均随围压、饱和度的增大而增大;建立了饱和度和围压对煤样压缩破坏过程中临界破坏点总能量耦合影响的多元线性回归方程,取得了较好的拟合度;随着围压和饱和度增加,临界破坏点处积聚的弹性能增大,从而产生较大的耗散能。
- 煤与瓦斯突出 /
- 含瓦斯水合物煤体 /
- 三轴压缩 /
- 能量特征 /
- 临界破坏点
Abstract: This study focuses on the energy variation rules of gas hydrate-bearing coal during deformation and failure, combined with the deviatoric stress-strain curves under conventional triaxial compression and the first law of thermodynamics. The results show that the elastic strain energy is dominant in the process of pre-peak deformation and failure of gas hydrate-bearing coal; while the gas hydrate-bearing coal may experience energy dissipation after the peak stress. Then, the total energy, elastic strain energy and dissipation energy all increase with increasing of the confining pressure and the saturation. Furthermore, the multiple linear regression equation depicting the viriation of saturation and confining pressure was established with the total energy of the critical failure point, with the better fitting effect. Moreover, the elastic energy accumulation at the failure point increases, thus producing the larger dissipation energy.
- coal and gas outburst /
- gas hydrate-bearing coal /
- triaxial compression /
- energy characteristics /
- critical failure point

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参考文献(20)

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常规三轴压缩下含瓦斯水合物煤体能量变化规律研究

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Energy Variation Rules of Gas Hydrate-bearing Coal Under Conventional Triaxial Compression

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