摘要
为研究煤岩在水、瓦斯共同作用下的强度特性,基于非饱和多孔介质混合物理论及有效应力原理,建立了含水瓦斯煤岩破坏准则。通过引入基质吸力应力因子,并利用实验得到基质吸力与煤岩含水率的拟合曲线,得出水-瓦斯-煤三相耦合作用下煤岩强度与瓦斯压力及含水率的关系式。在实验室进行三轴压缩强度实验,对含水瓦斯煤岩强度理论进行了验证。结果表明:基质吸力是含水瓦斯煤岩强度的重要影响因素,在水与瓦斯共同作用下,煤岩峰值强度随瓦斯压力增加线性减小,而随含水率增加呈指数降低。
To researching the strength characteristics of coal considered the interaction of water and gas,based on the mixture theory of unsaturated porous media and the principle of effective stress,failure criterion of coal containing water and gas was established. By introducing the stress factor of matric suction,and using the fitted curve of matric suction and moisture content obtained by experiment,the relationship of coal strength,gas pressure and moisture content was determined. According to triaxial compression strength test of coal containing water and gas,the strength characteristics established above is verified. The results show that matric suction stress is an important factor of coal strength.Under the combined action of water and gas,a linear decrease in peak strength of coal is noted with increasing gas pressure,and a index decrease in peak strength of coal was noted with increasing moisture content.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2014年第12期2418-2424,共7页
Journal of China Coal Society
基金
国家科技重大专项资助项目(2011ZX05065)
煤矿灾害动力学与控制国家重点实验室自主研究资助项目(0222002109128)
国家自然科学基金资助项目(51374258)
关键词
煤岩
含水率
瓦斯
有效应力
强度特性
coal
moisture content
gas
effective stress
strength characteristics
