1. State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing　 400030,China;2. College of Resources and Environ-mental Science,Chongqing University,Chongqing　 400030,China;3. Chengdu-Diao Mining Energy Co. ,Ltd. ,Chengdu　 610041,China

以南川宏能煤业(原半溪矿)矿井西翼K1煤层为研究对象,利用自主研制的含瓦斯煤热流固耦合三轴伺服渗流实验装置,进行了不同含水状态下的含瓦斯煤加卸载试验研究。研究结果表明:(1)随含水率增加,加卸载煤样的承载强度、残余强度、变形模量都呈现降低趋势,而轴向应变、径向应变、体积应变及侧向膨胀率均呈增加趋势。(2)加卸载过程中煤样甲烷有效渗透率变化与煤样损伤变形演化相对应,但存在明显的滞后现象;煤样破坏前,含水率越高,甲烷有效渗透率越小;煤样破坏后,含水率越高,甲烷有效渗透率反而越大。(3)随含水率增加,加卸载煤样破坏程度增大,裂隙发育增多,形变量增大,煤样加卸载过程中的总能量和耗散能也增加,而弹性能却减小。

The studied specimens are natural coals drilled from the west K1 coal bed of Ban-xi coal mine of Nanchuan- Hongneng Coal Industrial Company,China. By using self-developed “coal containing gas thermal hydrological mechan- ical (THM) coupling experimental equipment”,an experimental study on the loading-unloading test of coal containing gas was made under the condition of different moisture contents. The research results show that:① With the increase of moisture content,the bearing strength,residual strength and deformation modulus of loading-unloading coal samples all present a trend of decrease. However,the axial strain,lateral strain,volumetric strain and lateral expansion ratio all show a trend of increase;② The change of methane gas effective permeability corresponds with the damage deforma- tion of coal samples,but the curve of methane gas effective permeability lags behind the curve of stress-strain. Before coal samples damage,the higher the moisture content is,the lower methane gas effective permeability is. Conversely, after coal samples damage,the higher the moisture content is,the higher methane gas effective permeability is;③ With the increase of moisture content,the damage,fracture development and deformation of coal samples show a trend of in- crease. The total energy and the dissipation energy of coal samples present a trend of increase during the whole load- ing-unloading process,in contrast,the elastic strain energy presents a trend of decrease.

国家自然科学基金资助项目(51674048)；重庆市科技计划资助项目(cstc2015jcyjA90009)；中央高校基本科研业务费资助项目(CDJZR14245501)；

Jiang Changbao,Duan Minke,Yin Guangzhi,et al. Loading-unloading experiments of coal containing gas under the condition of different moisture contents[J]. Journal of China Coal Society,2016,41(9):2230-2237.