单轴应力–温度作用下煤中吸附瓦斯解吸特征.doc

单轴应力–温度作用下煤中吸附瓦斯解吸特征
何满潮1,2,王春光1,2,李德建1,2,刘静1,2,张晓虎2
(1. 中国矿业大学深部岩土力学与地下工程国家重点实验室,北京 100083;2. 中国矿业大学力学与建筑工程学院,北京 100083)
摘要:利用自主研发的深部煤岩温度–压力耦合瓦斯解吸试验系统,对鹤岗南山矿煤样进行单轴应力–温度作用下吸附瓦斯运移过程。该试验系统通过对煤样施加不同应力和温度,促使煤中原生吸附瓦斯解吸,模拟煤体变形中吸附瓦斯解吸–释放过程。试验中分别在恒温和升温条件下对煤样依次进行单轴破坏和施加围压,实时监测逸出气体压力、流量,抽样检测气体成分和浓度。研究结果表明煤体在单轴压缩破坏过程中出现气体逸出压力降低导致气体回流现象;对破裂煤样施加围压后短时间内排出大量高浓度气体。试验结果证实温度升高是诱发煤样中吸附瓦斯大量解吸因素之一,而煤体内是否存在大量贯通裂隙是影响瓦斯运移的重要因素。
关键词:采矿工程;温度–压力耦合;吸附;解吸
中图分类号:TD 324 文献标识码:A 文章编号:1000–6915(2010)05–0865–08
DESORPTION CHARACTERISTICS OF ADSORBED GAS IN COAL SAMPLES UNDER COUPLING TEMPERATURE AND PRESSION
HE Manchao1,2,WANG Chunguang1,2,LI Dejian1,2,LIU Jing1,2,ZHANG Xiaohu2
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Beijing 100083,China;2. School of Mechanics and Civil Engineering,China University of Mining and Technology,
Beijing 100083,China)
Abstract:The desorption process of adsorbed gas in coal from Nanshan coal mine is studied using an experimental system with temperature-pressure coupling in particular to treat the multiphysical effect on deep coal sample. This experimental system has been designed to apply triaxial pressure and temperature to coal sample,and reproduce the desorption-releasing process of absorbed gas as a result bination of pressure and temperature. pression tests are carried out on coal samples under