| 尹万蕾*,潘一山,李忠华,朱丽媛,宋艳芳.深部煤层瓦斯对煤力学性质影响规律研究[J].实验力学,2016,31(6):858~865 |
| 深部煤层瓦斯对煤力学性质影响规律研究 |
| On the Effect of Deep Coal Seam Gas to Coal Mechanical Properties |
| 投稿时间：2015-11-02 修订日期：2016-04-04 |
| DOI：10.7520/1001-4888-15-209 |
| 中文关键词: 深部开采 高瓦斯煤层 峰值强度 弹性模量 |
| 英文关键词:deep mining coal seam with high gas content peak strength elasticity modulus |
| 基金项目:国家重点基础研究发展计划(973)项目(2010CB226803)；国家自然科学基金项目(51174107, 51374119) |
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| 中文摘要: |
| 针对深部高瓦斯煤层复合动力灾害的特点，以阜新五龙矿高瓦斯煤样为研究对象，通过“煤岩渗透试验台-三轴渗透仪”试验装置，对比分析孔隙压力、峰值强度、弹性模量与瓦斯含量的相互关系，研究瓦斯对煤力学性质的影响规律。结果表明：浅部低瓦斯煤层瓦斯含量与孔隙压力之间符合Langmuir方程，深部高瓦斯煤层瓦斯含量与孔隙压力之间符合幂函数关系；煤体中的瓦斯的游离与吸附两种状态在一定温度和瓦斯压力下保持动态平衡，随瓦斯含量的增加，煤体中游离瓦斯量呈线性增加，煤体峰值强度随之降低；围压很低时,弹性模量与瓦斯压力之间近似呈线性关系，围压较大时,呈非线性关系，弹性模量随瓦斯含量增加而降低，瓦斯压力越大，弹性模量降低越多。 |
| 英文摘要: |
| Aiming at the characteristics of compound dynamic disasters in deep coal seam with high gas content, taking high gas content coal sample from FuXin WuLong mine as study object, using “coal and rock permeability test bench-triaxial permeameter” experimental devices, comparatively analyzing the relationship between pore pressure, peak strength, elastic modulus and gas content respectively, the influence of gas on the coal mechanical properties was investigated. Results show that the relation between gas content in shallow low gas coal seams and pore pressure is in accordance with Langmuir equation; while the relation between gas content in deep high gas coal seam and pore pressure is in the power function relationship; at a certain temperature and under a certain gas pressure, the gas in coal body is in a dynamic balance between free state and absorption state; along with the increase of gas content, the free gas volume increases linearly, the peak intensity of coal decreases; when confining pressure is very low, elastic modulus and gas pressure present linear relation, when confining pressure is higher, they present nonlinear relationship; elastic modulus decreases along with the increase of gas content; the higher the gas pressure is, the smaller the elastic modulus. |
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