| 空化水射流热效应影响煤体渗透率试验研究 |
| |
| 引用本文： | 卢义玉,丁 红,葛兆龙,等.空化水射流热效应影响煤体渗透率试验研究[J].岩土力学,2014,35(5):1247-1254. |
| |
| 作者姓名： | 卢义玉 丁 红 葛兆龙 等 |
| |
| 作者单位： | 1.重庆大学 煤矿灾害动力学与控制国家重点实验室，重庆 400044； 2.重庆大学 复杂煤气层瓦斯抽采国家地方联合工程实验室，重庆 400044 |
| |
| 基金项目： | 长江学者和创新团队发展计划资助（No. IRT13043）；国家自然科学基金项目（No. 51104191)；国家重大科技专项大型油气田及煤层开发（No. 2011ZX05065）。 |
| |
| 摘 要： | 对空化水射流空泡溃灭瞬间和空化噪声声场作用产生的热效应进行了分析,得到了热效应作用下的煤体渗透率表达式,并开展了不同空化条件(泵压、空化腔围压)下的煤体温度和瓦斯渗流试验。结果表明:空化腔围压一定时,温度随泵压的增大而升高;而泵压一定时,温度随空化腔围压的增大而减小。当热应力大于平均有效应力时,煤体热膨胀出现微变形,产生的张应力使裂隙变宽、数量增多;热效应使得游离瓦斯内能增加,分子自由程大大缩短,同时吸附瓦斯解吸使得煤基质发生收缩效应,导致微孔隙及微裂隙结构产生膨胀变形,从而影响煤体渗透率。试验得到渗透率随温度升高呈指数规律增大,与理论得到的渗透率表达式描述的规律相符。
|
| 关 键 词： | 空化水射流 割缝 热效应 空泡 渗透率 |
| 收稿时间： | 2013-08-10 |
Experiment study of effect of coal permeability under thermal effect of cavitation water jets |
| |
| LU Yi-yu,DING Hong,GE Zhao-long,XIA Bin-wei,CHENG Liang.Experiment study of effect of coal permeability under thermal effect of cavitation water jets[J].Rock and Soil Mechanics,2014,35(5):1247-1254. |
| |
| Authors: | LU Yi-yu DING Hong GE Zhao-long XIA Bin-wei CHENG Liang |
| |
| Institution: | 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; 2. National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, China |
| |
| Abstract: | Based on analyzing of the thermal effect generated by cavitation bubble breaking moment and sound field of cavitation noise, the theoretical formulas of coal permeability under the action of thermal effect are derived. The temperature and permeability tests are performed under different cavitation conditions (pump pressure and confining pressure). The results show that the coal temperature increases with the increasing pump pressure when confining pressure is constant; on the contrary, the coal temperature decreases with the increasing confining pressure of cavitation chamber when pump pressure is constant. When the thermal stress of coal is greater than the average effective stress, the micro deformation of coal appears under thermal expansion; and the tensile stress makes the increase in the width and number of cracks. Besides the increasing intrinsic energy of free gas causes the greatly reduces of molecular free path at the same time, due to coal matrix shrinkage effect, the coal methane desorption make the micro pore and crack structures expand, which affects the permeability. The index relationship between permeability and temperature is deduced, which is consistent with the regular pattern described by the theoretical formulas of permeability. |
| |
| Keywords: | cavitation water jets hydraulic cutting seam thermal effects cavitation bubble permeability |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
