地下采場爆破后炮煙擴散規(guī)律研究
[Abstract]:A lot of smoke will be produced after underground stope blasting. If the smoke is not discharged in time, it will cause smoke poisoning. Therefore, after blasting, the stope must be ventilated, the smoke of the stope must be replaced by the fresh air flow, and the content of toxic and harmful gases should be reduced to the permitted value before the follow-up work can be carried out and the workers can enter the stope. The traditional mine ventilation design is generally based on the size of stope space or blasting charge, according to experience to select the required air volume and wind speed, there is a lot of unscientific, combined with poor ventilation management, resulting in excessive ventilation time or loss of air volume. Sometimes toxic accidents are caused by poor ventilation. The relationship among blasting amount, smoke concentration and ventilation time, and the required air volume can provide a basis for reasonably calculating the required air volume of the mining site by studying the law of smoke diffusion after stope blasting. Taking the method of stage mine chamber as the research object, using Fluent fluid dynamics software to establish the law of simultaneous blasting smoke diffusion in different stages, and to analyze the influence of wind speed on the smoke diffusion. In this paper, the explosion ventilation in the third-stage -105m stope of Shirengou Iron Mine is used as the object of field measurement with intelligent carbon monoxide detector, and the smoke diffusion in the actual stope is analyzed. Based on the simulation and experimental results, a mathematical model of ventilation diffusion is established and compared with the traditional air volume calculation method to determine the reasonable calculation method of stope air volume. The main conclusions obtained by numerical simulation are as follows: the attenuation law of smoke concentration in return air roadway is negative exponentially with ventilation. Wind speed has little effect on the distribution of velocity field, but has influence on the distribution of gunfire smoke. Based on the monitoring of smoke diffusion in the stope of Shirengou Iron Mine, it is concluded that the smoke concentration decreases exponentially with ventilation after stope blasting. The calculation of the air volume of the one-stage blasting method is the highest in accordance with the calculation of the air volume of the roadway type mining face. The calculation of air volume of multi-stage simultaneous blasting is based on the calculation of air volume of cavern mining face and Kt is 1 or according to large blasting and I is 0.124 with the highest coincidence degree.
【學位授予單位】:華北理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TD235.1;TD72
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