(1. Key Laboratory for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering，Ministry of Education，Chongqing University，Chongqing 400044，China；2. Henan Provincial Coal Seam Gas Development and Utilization Co.，Ltd.，Zhengzhou，Henan 450016，China)
Abstract：Taking briquette made from raw coal as an object of study，which is from Shihao mine of Songzao Gas and Electric Company in Chongqing，the method and steps of triaxial test of creep and seepage for coal specimens containing gas are designed. By means of experimental equipments of coal seepage，under different temperatures and effective stress situations，the seepage test before and after coal creep are performed and a large number of test data are obtained；the effect law of creep on coal permeability is investigated based on the experimental results. The results show that，with the same temperature and average effective stress，permeability decreases 38.7% to 25.2% after the creep of coal sample；under the triaxial stresses condition，the higher the temperature and the greater the average effective stress are，the lower the coal gas permeability tends to be；meanwhile，the mechanism of their effects of the two factors on permeability has been discussed；the permeability loss caused by creep can not be partly recoveried；with a certain temperature，the permeability of damage and effective stresses conforms to the linear relationship；the permeability of damage increases with an increase in effective stress，and the higher the temperature is，the greater the rate of increase tends to be；with different temperatures and effective stress coupling，the influence of creep on coal permeability is different. The results have a reference value for further exploring the law of gas seepage in coal.
