摘要
煤层注水对防突具有显著效果,而煤层孔隙特性是影响瓦斯吸脱附及渗流的重要因素,为了从孔隙角度揭示不同注水压力对原煤体甲烷吸脱附性能的影响。选取首山矿己15-12070工作面进行煤层注水现场实验,使用氮吸附法得出各煤样孔隙特性并用分形理论计算孔隙粗糙度,使用静态容量法测出各煤样吸脱附参数。结果表明:注水后各孔径段孔隙量均有所增加,注水压力与比表面积、孔容及分形维数呈线性正相关关系;孔隙特征参数与甲烷吸脱附性能呈线性正相关关系;各煤样均出现甲烷吸脱附迟滞现象,且注水压力越高,甲烷吸附能力越强,脱附迟滞程度越大。煤层注水压力越大,煤的孔裂隙数量会增多且粗糙度增大,煤体倾向于保留更多的瓦斯。
Coal seam water injection has a remarkable effect on outburst prevention.Pore characteristic of coal seam is an important factor affecting gas adsorption/desorption and seepage.In order to research the influence of coal seam water injection on methane adsorption/desorption characteristics from the pore point of view,the ji15-12070 face in Shoushan mine was selected for coal seam water injection experiment.The nitrogen adsorption method was used to study the pore characteristics of each coal sample and the fractal theory was used to calculate pore roughness.Then the static volumetric method was used to measure the adsorption/desorption parameters.The results show that the pore volume of each pore section increases after water injection,and the injection pressure has a positive correlation with specific surface area,pore volume and fractal dimension.Methane absorption/desorption hysteresis appears in each coal sample,and the higher the injection pressure is,the stronger the methane adsorption capacity is,and the greater the desorption hysteresis is.The number of pores and the roughness will increase with the increase of coal seam water injection pressure,it tends to retain more gas.
作者
蒋仲安
王龙飞
张晋京
刘庆军
陈举师
JIANG Zhongan;WANG Longfei;ZHANG Jinjing;LIU Qingjun;CHEN Jushi(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine,University of Science and Technology Beijing,Beijing 100083,China;China Pingmei Shenma Group,Pingdingshan 467000,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2018年第10期2780-2788,共9页
Journal of China Coal Society
基金
国家自然科学基金资助项目(51604018)
中央高校基本科研业务费专项资金资助项目(FRF-BD-17-007A)
关键词
煤层注水
吸脱附性能
孔隙特性
氮气吸附
分形维数
coal seam water injection
adsorption/desorption properties
pore characteristics
N2 adsorption
fractal dimension
