不同含水率及围压条件下含瓦斯煤能量变化规律
Energy variation law behind coal containing gas under different water contents and confining pressures
高霞 1刘飞 1杨书朋 1张保勇 2吴强2
作者信息
- 1. 黑龙江科技大学 建筑工程学院,哈尔滨 150022
- 2. 黑龙江科技大学 安全工程学院,哈尔滨 150022
- 折叠
摘要
为探究含瓦斯煤变形破坏过程中的能量耗散规律,利用自主研制的煤岩力学性质测试装置,开展含瓦斯煤在不同含水率及围压下的常规三轴试验,基于热力学第一定律,分析含瓦斯煤偏应力-应变曲线不同阶段和特征点处的能量变化规律.结果表明:不同含水率时,围压从12 MPa增大到20 MPa时,对应的弹性能占比增幅分别为60.33%、20.11%和3.86%,弹性能占比、破坏强度和弹性模量均增大,说明围压对含瓦斯煤体的变形破坏具有一定的抑制作用;不同围压时,含水率从1%增加到5%,对应的总能量分别下降25.38%、8.78%和6.23%,总能量、弹性能和破坏强度总体上均减小,导致含瓦斯煤更易破坏.含水率的增大使含瓦斯煤颗粒间摩擦力降低,促进煤颗粒间的相对移动.
Abstract
This paper aims to explore the law of energy dissipation in the process of coal containing gas deformation and failure.The study consists of performing conventional triaxial tests on coal containing gas under different water contents and different confining pressures by using a self-developed testing de-vice for the coal mechanical property;and analyzing the energy variation laws of deviatoric-strain curves at specified points and different stages based on the first law of thermodynamics.The results show that under different water contents,with the increase of the confining pressure from 12 MPa to 20 MPa,the corresponding elastic energy ratio increases by 60.33%,20.11% and 13.86%,respectively.The in-crease in elastic energy ratio,failure strength and elastic modulus indicates that confining pressure has an inhibition effect on the deformation and failure of coal containing gas.Under different confining pres-sures,with the increase of water contents from 1%to 5%,the corresponding total energy decreases by 25.38%,8.78% and 6.23%,respectively.The coal containing gas is easily broken caused by the de-cline of the total energy,elastic energy and failure strength.The friction between coal particles containing gas decreases with the increase of water content,which hastens the relative movement of coal particles.
关键词
煤与瓦斯突出/含瓦斯煤/常规三轴试验/含水率/围压/能量变化规律Key words
coal and gas outburst/coal containing gas/conventional triaxial test/moisture content/confining pressure/law of energy change引用本文复制引用
基金项目
国家自然科学基金联合基金项目(U21A20111)
国家自然科学基金项目(51974112)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据