研究含瓦斯煤岩的蠕变特性是认识煤矿井下煤与瓦斯延迟突出机理的重要手段。为确定含瓦斯煤岩的蠕变规律，采用自行研制的含瓦斯煤岩蠕变试验装置，对含瓦斯煤样进行了系统的三轴蠕变试验。利用西原模型与能描述非牛顿流体的粘弹塑性体相结合，建立了改进的含瓦斯煤岩三维蠕变模型，并根据实验结果拟合出了模型的参数。根据含瓦斯煤岩在不同的载荷条件下的三维蠕变试验结果对蠕变模型进行了验证。结果表明，所提出的含瓦斯煤岩三维蠕变模型能很好地描述含瓦斯煤岩各蠕变阶段的变形特性，尤其是加速蠕变阶段。此外还根据微分方程解的稳定性理论，讨论了

Investigation on the creep property of coal containing gas is an effective means for understanding the mechanism of delay outburst of coal and gas in a coal mine. This paper conducts triaxial creep tests on the specimens of gascontaining coal using a selfmade creep experimental apparatus to determine the creep law for coal containing gas. An improved triaxial creep model is developed for containing gas by coupling a Nishihara model with another viscoelastoplastic body which can describe the deformation property of nonNewtonian fluids. The parameter fittings are conducted based on the experimental dada.The present model is examined in terms to the results of triaxial creep tests in various stresslevel cases. The result shows that the proposed model for gascontaining coal can properly represent the creep deformation at different creep stages, especially at the accelerating stage. The instability condition of the model for coal containing gas is also discussed according to stability theories of differential equation solution.

国家自然科学基金资助项目(40672192,40772193,50479072);国家重点基础研究发展计划(973计划)项目(2009CB724603)