Construction of similar test model for mine dust-proof water supply network and optimization of pressure monitoring layout

Based on the hydraulic similarity theory, a theoretic method for establishing a similar test model equivalent to the mine dust-proof water supply network was proposed. Based on the basic equations of fluid mechanics and the dimensional analysis method, combined with the gravity similarity criterion and the pressure similarity criterion, the relationship between the main physical indicators of the water supply pipe network and its similar model was derived.The EPANET hydraulic simulation software was used to solve the pipe network prototype and model hydraulic conditions under the maximum dust-proof water consumption, and the error analysis was performed.The results show that the average relative errors of similar ratios for volume flow rate, velocity and head difference were calculated to be 0.20%, 0.46% and -4.20% respectively, verifying the rationality and feasibility of similar test model construction. At the same time, in order to further effectively monitor the hydraulic conditions of similar physical models, an optimized mathematical model of measuring points was constructed based on information theory and correlation coefficients, and the dynamic hydraulic simulation of daily dust water demand was used to optimize the arrangement of pressure monitoring points.