Study on influencing factors of stope thermal environment in Maoping Lead Zinc Mine

Mine thermal hazards are increasingly becoming a major problem for the deep mining.Taking Maoping Lead Zinc Mine as an engineering case, this article adopts the methods of field test and numerical simulation to study the influences of different heat sources on the thermal environment of deep mine quarry.A physical model of Maoping Lead Zinc Mine stope was constructed according to the measured temperature gradient and thermal environment parameters, and COMSOL software was used to analyze the effects of four heat sources, including airflow temperature, human body, electromechanical equipment and backfill, on the temperature of the stope and the surrounding rock under the condition of lower ground temperature.The numerical calculations were validated by field temperature measurements.The results show that the current mining level has a low ground temperature of 21.60 ℃, and the ground temperature gradient is 1.66 ℃/hm.Ash-sand ratio is an important factor affecting the heat release of backfill.The heat generated by backfill will not only be transferred directly to the stope by airflow, but also be conducted to the roadway wall through the surrounding rock, resulting in the temperature rise of the stope.Ground temperature has a great influence on stope temperature, and the stope temperature increases linearly with the increase of ground temperature.Each heat source shows different influence degree on the stope environment in Maoping Lead Zinc Mine, with airflow significantly increasing the stope temperature, followed by backfill and electromechanical equipment, and the human body exerting the smallest impact.