STUDY ON THE OXIDATION AND TEMPERATURE INCREASE PROCESS OF UNBURNED COAL GANGUE ROADBEDS IN COLD REGIONS
Coal gangue,a solid waste generated during coal mining and washing processes,could effectively address issues of space occupation and environmental pollution if used for roadbed construction.This study establishes a temperature-oxygen concentration calculation model for unburned coal gangue roadbeds and conducts long-term simulation analysis,leading to the following conclusions,the internal temperature of unburned coal gangue roadbeds is higher than that of gravel-soil roadbeds,requiring 3 years to reach a balanced state,after this period,the surface temperature fluctuates,while the central area's temperature rises slowly.The roadbed surface is significantly affect-ed by oxygen concentration and ambient temperature,while the central region shows a noticeable heat storage effect and slower oxidation rate.The oxygen concentration at the roadbed surface is higher than inside,causing continuous infiltration of oxygen into the central area,leading to an overall increasing trend.Clay sealing layers can provide ther-mal insulation,effectively control the roadbed temperature,prevent oxygen infiltration,and regulate the oxidation rate.The clay isolation layer separates the gangue,reduces the exothermic effect of oxidation,lowers the average roadbed temperature,and controls the temperature of the lower fill material.This research offers theoretical support for the use of coal gangue in roadbed construction.
unburned coal ganguesubgrade structureoxidation ratefiller temperature
万方数据
维普
