College of Safety Science and Engineering,Liaoning Technical University
Research Institute of Safety Science and Engineering,Li⁃aoning Technical University

In order to investigate the influence law of fault tectonic on coal structure and spontaneous combustion char⁃acteristics,the fault tectonic coal and primary coal in No. 11301 working face of Hongqingliang coal mine were takenas study samples. The FT-IR experiment of infrared spectrum,thermogravimetric analysis experiment,low tempera⁃ture nitrogen adsorption experiment and closed coal oxidation experiment were used to analyze the active groupcontent,combustion characteristic temperature,pore structure characteristics,oxygen consumption rate,and oxida⁃tion heat release intensity of coal samples from a micro perspective and a macro perspective separately. The results of the FT - IR experiment of infrared spectrum showed that the active groups of the fault tectonic coal weremore than those of the native coal,and the oxidation activity of the fault tectonic coal was high. The results of the ther⁃mogravimetric analysis experiment showed that the cracking temperature,critical temperature,ignition temperature,peak temperature and combustion temperature of the fault tectonic coal were lower than those of the native coal,and the fault tectonic coal showed a stronger tendency of spontaneous combustion. The results of the low tempera⁃ture nitrogen adsorption experiment showed that the fault tectonism changed the pore structure of the coal,and com⁃pared with the native coal,the specific surface area of the fault tectonic coal increased by 2.5 times,and the averageincrease of pore size was 2.36 times,the increase of micropore volume and mesopore volume were 2.71 times and1.69 times respectively. The influence of fault tectonism on the pore structure characteristics of coal was facilitated theoxidation reaction between oxygen and active groups in the pores. The results of the closed coal oxidation experimentshowed that under the condition of temperature of 25-70 ℃,oxygen consumption rate,CO release rate,CO2 releaserate and oxidative exothermic intensity of coal increased exponentially with the increasing temperature. Under the con⁃dition of oxygen concentration of 20% and temperature of 25-70 ℃,the oxidation exothermic intensity of the fault tec⁃tonic coal in No. 11301 working face of Hongqingliang coal mine was 1.37-2.00 times of the native coal. The tenden⁃cy of spontaneous combustion was stronger for the fault tectonic coal compared with the native coal of the seam. Thewhole studies revealed from micro and macro perspectives that the reason why the fault tectonic coal was more prone tospontaneous combustion in the actual mining environment was that the coal’s own structure and spontaneous combus⁃tion environment factors were changed to make it more favorable for spontaneous combustion.