[This article belongs to Volume - 53, Issue - 02]
Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-16-10-2021-59

Title : Similar Materials and Mechanical Properties of Coal-Gas Two-phase Media Based on Solid-Gas Coupling
ZHANG Qinghe, FANG Zhiyuan, MA Yankun, ZHANG Zheng,

Abstract :

Gas-containing coal is a two-phase dielectric composite material with porous characteristics and solid-gas coupling characteristics. In order to accurately simulate the physical and mechanical properties of gas-containing coal, based on similarity criteria and similarity scales of main control parameters, with more than 80 sets of material matching tests and mechanical parameter tests, a similar material for coal-gas two-phase medium was developed. The similarity between similar materials and raw coal was compared, and based on the new material, a three-dimensional simulation test of coal and gas outburst was performed. The main conclusions were as follows. 1) The elastoplastic parameters and adsorption parameters of new material prepared by pulverized coal and sodium humate aqueous solution as aggregate and binder is similar to raw coal. Similar materials with different elastic-plastic parameters can be prepared by adjusting the material ratio. The adsorption of similar materials is consistent with that of raw coal. 2) The expansion energy of the binary mixture of CO2 and N2 is between CO2 and N2. The proportional coefficient of expansion energy and CO2 volume fraction are quadratic functions. The expansion energy of the mixture with 45% CO2 volume fraction is consistent with that of CH4. The binary mixture of CO2 and N2 can be used as similar gas to CH4, and it is safer than CH4. 3) The new material is highly similar to the physical and mechanical parameters of raw coal containing gas, which realizes the simulation of gas-solid coupling characteristics. 4) A three-dimensional physical simulation experiment reproduces the phenomenon of outburst caused by uncovering coal, and the morphology of outburst holes and the quality of outburst pulverized coal that are close to the field are obtained, which verifies the rationality of similar materials, and also provides a scientific means for further study of the law of outburst and monitoring the precursor information of outburst.