RESEARCH ON COAL PERMEABILITY EVOLUTION LAWS AND MULTI-SCALE EFFECT
LI Hongyan1，2，QI Qingxin1，LIANG Bing3，PENG Yongwei1，2，DENG Zhigang1，2，LI Chunrui1，2
(1. China Coal Research Institute，Beijing 100013，China；2. Tiandi Science and Technology Co.，Ltd.，Beijing 100013， China；3. School of Mechanics and Engineering，Liaoning Technical University，Fuxin，Liaoning 123000，China)
Abstract：The combination method of the laboratory experiment and field experiment is used. Coal permeability stress sensitivity experiment，complete stress-strain permeability measurement experiment，and the permeability measurement field experiment of mining coal are carried out to study the coal permeability evolution laws. The results of all the experiments are compared to find the difference and the relation among the three experiments. The stress intensity and loading-unloading history are the main influencing factors for the permeability evolution of coal. The permeability value is magnitudes 2–4 lower for the laboratory scale against the engineering scale. The scope of application of the three experimental methods is summarized so as to provide reliable support for the correct choice of coal permeability.
