Study of the parameters of spontaneous fire seats in coal pit rock dumps

Sergey Protasov,Marina Gorbacheva,Alena Bobrovnikova,Evgeny Seregin,Vyacheslav Portola,S Vöth,M Cehlár,N Demirel,D Szurgacz,A Abay,L Sobik,J Janocko,Y Tan

doi:10.1051/e3sconf/202131502007

Abstract

The presence of coal and coal-bearing rocks in waste rock dumps of open-pit coal mines contributes to the occurrence of spontaneous combustions that negatively affect the environment and people. Measurements of the temperature and the content of hazardous gases in the temperature anomaly that arose in the waste rock dump of the open-pit coal mine were made to assess the parameters of spontaneous fire seats. In the course of the study, the efficiency of detecting spontaneous fire seats in waste rock dumps was assessed by measuring the rock temperature in the wells with a depth of 2.5 m, drilled at a distance of 20 m from each other. The experiment showed the difficulty of drilling control wells in waste rock dumps and the impossibility of drilling them on the slopes of dumps, especially in spontaneous fire seats with a high rock temperature. The necessity of casing control wells with pipes makes it difficult to measure the rock temperature at different depths. It was found that there are sharp drops in the rock temperature in the heated area of the dump, which cannot be detected when the wells are located at the recommended distance. The measurements showed that in all wells the temperature increases with depth, therefore the depth of wells recommended by the regulatory documents does not allow determining the size of the heated area.

Highlights

Opencast coal mining is accompanied by the movement of huge rock masses
In order to reduce damage to the environment from spontaneous fires occurring in waste rock dumps, the rock temperature control is enhanced, which makes it possible to detect the processes of oxidation and spontaneous combustion of coal-bearing rocks at an early stage
Almost in all wells drilled in the spontaneous fire zone to a depth of 2.5 m, an increase in the rock temperature is observed with an increase in the depth of the well

Summary

Introduction

Opencast coal mining is accompanied by the movement of huge rock masses. Such disturbance of the balance of nature leads to the emergence of dangerous and harmful factors that threaten human health and life, negatively affects the natural environment [1-3]. In order to reduce damage to the environment from spontaneous fires occurring in waste rock dumps, the rock temperature control is enhanced, which makes it possible to detect the processes of oxidation and spontaneous combustion of coal-bearing rocks at an early stage.

Results

Conclusion