EXPERIMENTAL STUDY ON DEFORMATION AND SEEPAGE PROPERTIES OF OUTBURST COAL SAMPLES UNDER
CYCLIC LOADING
(1. College of Resources and Environmental Sciences，Chongqing University，Chongqing 400030，China；2. College of Resources and Environment，Guangxi University，Nanning，Guangxi 530004，China；3. Key Laboratory for the Exploitation of Southwest Resources and the Environmental Disaster Control Engineering of Ministry of Education，Chongqing University，
Chongqing 400030，China)
Abstract：Based on the typical coal and gas outburst K1 coal seam of Sanhui mine which belongs to Tianfu Coal Industry Co., Ltd.，the seepage experiments of outburst coal samples under cyclic loading，constant gas pressures and different confining pressures are conducted by self-developed fluid-solid-heat coupling triaxial servo-controlled seepage system of coal containing gas. The research results show that plastic deformation of coal sample is produced under cyclic loading. With the cyclic number，its elastic modulus and permeability both tend to decrease which is the most obvious in the first cycle. The permeability of coal samples gradually increases in unloading process and decreases in loading process. Closed rings are formed in the permeability-strain curves in the two above processes，corresponding to a closed hysteresis loop formed in axial stress-strain curve，which indicates that permeability changes is closely related to the damage deformation of coal sample. What¢s more，permeability rate is positively correlated with damage variable. The variation is more obvious in the previous cycles and tends to be stable after the later cycles.
李晓泉1，2，尹光志1，3，蔡 波1. 循环载荷下突出煤样的变形和渗透特性试验研究[J]. 岩石力学与工程学报, 2010, 29(S2): 3498-3504.
LI Xiaoquan1，2，YIN Guangzhi1，3，CAI Bo1. EXPERIMENTAL STUDY ON DEFORMATION AND SEEPAGE PROPERTIES OF OUTBURST COAL SAMPLES UNDER
CYCLIC LOADING. , 2010, 29(S2): 3498-3504.
2010, Vol. 29 
