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低频机械振动煤体瓦斯含量变化规律研究

李树刚, 赵勇, 许满贵

李树刚, 赵勇, 许满贵. 低频机械振动煤体瓦斯含量变化规律研究[J]. 岩土工程学报, 2015, 37(5): 918-923. DOI: 10.11779/CJGE201505018
引用本文: 李树刚, 赵勇, 许满贵. 低频机械振动煤体瓦斯含量变化规律研究[J]. 岩土工程学报, 2015, 37(5): 918-923. DOI: 10.11779/CJGE201505018
LI Shu-gang, ZHAO Yong, XU Man-gui. Change law of gas content under low-frequency vibration[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(5): 918-923. DOI: 10.11779/CJGE201505018
Citation: LI Shu-gang, ZHAO Yong, XU Man-gui. Change law of gas content under low-frequency vibration[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(5): 918-923. DOI: 10.11779/CJGE201505018

低频机械振动煤体瓦斯含量变化规律研究  English Version

基金项目: 国家自然科学基金项目(51174157); 国家自然科学基金科; 学仪器基础研究专款项目(51327007)
详细信息
    作者简介:

    李树刚(1963- ),男,甘肃会宁人,博士,教授,博士生导师,主要从事围岩活动与瓦斯防治技术,非稳态渗流力学,矿山安全工程技术等教学与科研工作。E-mail: lisg@xust.edu.cn。

    通讯作者:

    赵勇

Change law of gas content under low-frequency vibration

  • 摘要: 为研究低频机械振动频率对煤体瓦斯含量的影响,建立孔隙瓦斯压力、吸附膨胀力、机械挤压应力作用下振动动态煤体瓦斯含量方程。利用瓦斯吸附/解吸激振与测试系统进行振动未吸附饱和型煤试件试验检验方程,结果显示:振动频率相同,振动时间增加,煤体孔隙增多,煤体内部游离瓦斯增多,瓦斯含量变大;振动时间相同,振动频率越大,煤体孔隙率越大,煤体瓦斯含量越大,且20 Hz与10 Hz含量差值由小变大,30 Hz与20 Hz含量差值由大变小。表明振动增大了煤体孔隙率,使煤体瓦斯含量增加,且振动频率从10,20,30 Hz逐渐增加,孔隙率逐渐变大,煤体瓦斯含量相应变大,方程计算值能较好反应不同振动频率、振动时间作用下煤体瓦斯含量变化规律。
    Abstract: To study the effect of low-frequency disturbance load on gas volume, a formula for gas content considering coal porosity pressure, absorption strength and decreasing vibration stress is established. Meanwhile, the absorption capacity formula is verified by using vibrating and absorption instruments. The tests indicate that under the constant vibrating frequency, when the vibration time extends, the porosity and free-state gas increase, so gas content increases. Under the constant vibrating time, when the frequency speeds up, the porosity expands and gas content increases. Under frequency of 20 Hz and 10 Hz, D-value of content moves up, while under frequency of 30 Hz and 20 Hz, D-value of content moves down. The vibration expands the porosity inside the samples, thereby the gas content accumulated. When the frequency moves up to 10, 20 and 30 Hz, the porosity expands and the gas content is accelerates accordingly. The proposed formula significantly reveals the change law of gas content under different frequencies and time ranges.
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出版历程
  • 收稿日期:  2014-09-15
  • 发布日期:  2015-05-19

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