| Currently,deep mining has become the trend in underground mines.Complex mining conditions and harsh working environment have a significant impact on the safety and efficiency of underground mining process.Furthermore,the combined effect of geothermal gradient and heat source results in heat damage problems.High-temperature environment not only threatens human health but also has a significant impact on man-machine system efficacy.Therefore,the efficiency change rule of the man-machine system is obtained in the deep heat damage environment.On this basis,ventilation parameters of the deep working face are optimized to ensure the safety and efficient operation of the man-machine system in deep mining.Sanshandao gold mine is treated as the research object.The problem of heat damage in deep mining and its effect on the man-machine system is researched from the aspects of heat source analysis and heat damage evaluation,analysis of the man-machine system efficiency,and ventilation parameter optimization in the working face.The research contents are as follows:(1)The distribution of heat sources and heat release was obtained by the analysis and calculation of each heat source respectively based on the technical characteristics of deep mining in the Sanshandao gold mine.The comprehensive evaluation indicators system of heat damage in the deep well was constructed from three aspects including objective conditions,intervention and treatment,and subjective feeling.The evaluation model of heat damage in the deep well was built based on the unascertained measure theory,which solved the measurement of the uncertainties in heat damage and provided environment parameters for human comfort experiment.(2)The influence of high temperature and humidity environment on the physiological indicators of workers in the deep mining area was tested by laboratory simulation experiments.The degree of human fatigue was judged by combining EEG signals with subjective fatigue and the indicators changing rule of personnel comfort and work fitness with the working hours under different working conditions,individual characteristics and labor intensity were analyzed.The influence of environmental factors on the physiological indicators was sorted.On this basis,a quantitative model between physiological indicators and environmental parameters was constructed,which provides a basic model to research manmachine system efficiency.(3)A system dynamics model describing the man-machine system efficiency in deep mining was constructed based on the complex coupling effect of multiple factors(i.e.,personnel,equipment,environment and others)on the efficiency of man-machine system.The change law of the man-machine system efficiency under the effect of a single factor and the coupling effect of multiple factors was simulated and analyzed.The expression of the coupling relationship between deep mining environmental parameters with the working face temperature was obtained to provide a basis for ventilation parameters optimization in the working face.(4)A typical working face with non-through drift in Sanshandao gold mine was treated as a case to study the local ventilation parameters optimization.The ventilation method and key parameters suitable for cooling working face temperature in deep mining were obtained to improve working environment and ensure the man-machine system efficiency.Theories such as unascertained measure and system dynamics and methods including theoretical research,laboratory experiment,system simulation and numerical simulation were comprehensively applied to study the man-machine system efficiency and the optimization of ventilation parameters in the working face.The research results provide technical support for Sanshandao gold mine to improve the working environment and improve the efficiency in deep mining.The research thoughts,models and methods used in this thesis provide a significant reference for the study of man-machine system efficiency in deep mines. |
PDF Full Text Request