Research On The Multi-field Coupling Fracture Mechanism Of Coal Containing Gas

In the process of mining, coal and rock containing gas will be instability along with rockexplosion, coal blasting and gas outburst other dynamic disasters. When it comes to thereducing disasters and accidents, and safeguarding the safety of coal production, the research,which is on coal and rock containing gas under the effect of instability failure mechanismwith the multi-field coupling, will have an important role in engineering significance andtheoretical guidance.This paper views coal and rock containing gas as the research object, aiming at the mainfactors of affecting coal and gas outburst.TheWY-98B type detector for gas adsorption teststhe coal gas adsorption experiments in conditions of different temperature and differentpressure, the change rule of the coal gas adsorption capacity with temperature and pressureand the normal form of the gas adsorption constant are given, and the main physicalparameters is presented. This paper adopts a kind of rock seepage characteristic test systemcombining WOW-100E microcomputer control electronic universal testing machine to testthe seepage of coal and rock in three axis function, studies the seepage characteristics of coaland rock and gives the permeability parameter of coal and rock. This paper conducts uniaxialcompression experiment for coal sample in microcomputer control electronic universal testingmachine, measures the acoustic emission characteristic parameters, and gives the relationshipbetween stress and strain of coal samples, acoustic emission energy and amplitude variationwith time. This paper uses weibull distribution to establish the damage evolution equation ofcoal burst, analyses the coal sample of the internal micro cracks extend to the macroscopicdamage mechanism across scales.On the basis of the physical parameters given on an experiment, this paper establishes coaland rock containing gas failure mathematical model coupling between seepage field，stressfield and fracture field. According to the coupled equations, considering the influence of coalbody micro deformation on the macroscopic properties, using comsol software to calculate the distribution of gas pressure in coal seam in the different damage cases. Explained the roleof the multi-field coupling a large number of coal and rock in vivo micro-damageaccumulation through cross-scale nonlinear cascade induced by macroeconomicdevelopments catastrophic coal, and gives the damage fracture criterion coal containing gasfrom the energy point of view. Finally, on the basis of the macroscopic statistics and coal rockstrength distribution, this paper researches coal containing gas loss of multi scale mechanismin multi field coupling, and gives the macro failure probability function and cross scalesensitivity function of coal and rock in multi field coupling.