The Research On Comprehensive Similarity Simulation Experimental Platform Of Goaf Seepage

Adopt the method of field measurement and numerical study of goaf has certainlimitations, model experiment method has its advantages. In this paper, combining theory study and design of experiment, devoted to setting up to the real response of goaf seepage law of goaf simulation experiment platform.This paper summarizes the previous goaf simulation experiment, analyzes the characteristics and shortcomings. According to the mine pressure theory, this paper discusses the lithostructure and characteristics of the goaf, introduces the height and the expansion factor characteristics of caving zone. On the basis of dynamics of fluid in porous media, expounds the theory of gas flow in goaf.Guided by the similarity theory gives the single value condition goaf experimental model that should be followed. Similarity criterion was derived using the equation analysis method, the processing method of similarity criterion is given. On the premise of meet the reynold criterion, the conditions of boundary parameters should satisfy was derived. Ensure the gas flow state in the experimental platform are in conformity with the prototype.Design a set of one-dimensional porous media seepage test device. Through this device can have different media seepage parameters, determine the seepage equation of motion. Device is part of the Comprehensive Similarity Simulation Experimental Platform. It provides support to quantitative control the permeability of the experimental platform medium.Experimental platform with practical goaf as the prototype, proportional similarity is 1:100, the use of steel.Can adjust various boundary conditions, such as the height and angle of goaf, the ventilation pattern of working face, the wind resistance, air volume, pressure and permeability distribution, etc. Set up the gas release system, can be simulated under different conditions of goaf air leakage, gas emission and the generation of toxic or harmful gases. Experimental platform using automated monitoring system, can pressure of goaf, gas concentration, the temperature parameters of digital collection and processing.