Experimental system and method for simulating particle deposition behavior in coal mine mining-induced fracture

Abstract

The invention discloses an experiment system and method for simulating a particle deposition behavior in a coal mine mining-induced fracture. The experimental system comprises an air supply unit, a material supply unit, a fracture experiment unit and a data acquisition unit. The air supply unit is used for simulating the underground coal mine negative pressure extraction working condition, the fracture experiment unit is used for simulating underground coal mine mining-induced fractures, the fracture scanner is used for conducting fracture scanning on the flat fracture experiment section to generate an initial experiment fracture modeling model, and then the air supply unit is used for pushing particulate matter to enter the flat fracture experimental section; after the pressure difference data of the front end and the rear end of the flat fracture experimental section is stabilized in a set range, section scanning is performed to generate a secondary experimental fracture modeling model; and then the secondary experimental fracture modeling model is compared with the initial experimental fracture modeling model, the specific coordinate position and weight data of the particulate matter retained in the flat fracture experimental section are determined, and a theoretical basis and experiment data can be provided for optimizing coal mine underground field mine gas extraction process parameter design.

Description

technical field [0001] The invention relates to a gas-solid two-phase flow experimental system and method, in particular to an experimental system and method for simulating particle deposition behavior in mining cracks in coal mines, and belongs to the technical field of efficient development of coal mine gas. Background technique [0002] Mine gas is a harmful gas produced by physical and chemical effects during the long process of formation and metamorphism of coal. Coal seam gas will be released into the mining space during the coal mining process, causing the gas to exceed the limit, which will bring hidden dangers to mine production and seriously restrict the safe production of coal mines. Establishing safe and efficient gas drainage technology is the fundamental measure to control coal mine gas disasters. At present, there are two main mining methods for coal seam gas: one is through surface drilling for negative pressure extraction, and the other is for underground d...

AI Technical Summary

Problems solved by technology

That is to say, this invention patent is essentially simulating and studying the artificial use of compressed gas to send a large amount of particulate matter into the coal seam drilling outside the first drilling hole sealing, and then a large amount of particulate matter enters the cracks to form a large-area embolism and isolate the outside air from entering. Instead of studying the problem of reducing the permeability of the fracture field caused by a small amount of particulate matter entering the fracture to form a local embolism in the coal seam drilling inside the first sealing hole, and thus reducing the efficiency of gas drainage, this The technical solution invented cannot realize the research on how to effectively avoid the problem of fracture field permeability reduction caused by local plugging of mining fractures in the negative pressure drainage environment, and cannot provide a theoretical basis for optimizing the design of mine gas drainage process parameters in underground coal mines and experimental data

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