Numerical Simulation And Risk Assessment Of Erosion Wear Of Filling Pipes

Pipeline transportation is a commonly used technical means in mine filling and mining.Due to the proportion of filling materials and the complex structure of pipelines,wear and damage of filling pipelines occur from time to time.In order to solve the problem that the entire filling system loses its stability due to the wear and tear of the conveying pipeline,this paper comprehensively uses the means of theoretical analysis and numerical simulation to study the mechanism between various factors and the wear failure of the filling pipeline.The pipeline wear risk assessment system is constructed according to the engineering situation.The main work and research results of this paper are as follows:(1)Fluent software was used to simulate the transportation process of slurry in common variable-diameter curved pipelines.Based on the single factor analysis method,the effect of various factors on the erosion and wear of pipelines is analyzed from pipeline characteristics,filling technology and slurry characteristics.The results show that the maximum erosion rate will gradually decrease with the increase of the inlet and outlet pipe diameter ratio.When the pipe diameter ratio exceeds 0.85,the overall erosion area and range of the pipeline will suddenly decrease and change;the inlet velocity will increase from 0.8m/s to 2m/s after,the erosion area of the pipeline develops rapidly,and the maximum erosion rate shows a strong consistency with the erosion area,with an increase of about 43 times;when the impact angle changes in the range of 0°～90°,the erosion area continues to the maximum erosion rate showed a trend of increasing first and then decreasing,and reached a peak when the impact angle was 30°.(2)The gray correlation analysis method was used to calculate the correlation degree of each comparative factor and the pipeline erosion rate in the following order: inlet flow velocity > length of variable diameter section > roughness > bending angle > average particle size > shape coefficient > mass flow rate > Impact angle > Mass concentration > Pipe diameter ratio.(3)Based on the AHP-SPA theory,a risk assessment model for filling pipeline wear was constructed,and a comprehensive analysis was made on the filling systems of Suncun Coal Mine and Huatai Coal Mine.According to the evaluation results,the application of the backfill engineering of the two coal mines is reasonably optimized.