Discrete Yuan Numerical Simulation And Application Discuss Of Coal Rock Mechanics Properties

Coal rock gas reservoir has the features such as development shallow depth，theexploration risk small，less investment，effective quickly，has become one of the mostactive field of unconventional reservoir development.Because of the single wellproductivity of coalbed methane(CBM) is low，single well must be fractured so that wecould obtain production，so the master of coal rock mechanics properties is a big basictheory of field of CBM development.This paper made use of higher rock mechanics，determination method of coalrock mass strength and coal rock triaxial compression test method，obtained beddingfeatures，discrete yuan，the theory and methods of discrete element numericalsimulation technology and its application in rock mechanics，and other disciplines，on the basis of previous studies，This paper studied the coal rock mechanicsproperties considering the effect of the coal rock bedding etc weak structure plane andcoal rocks buried conditions. Due to the discrete element method is applicable todiscontinuous mass stress analysis，after detailed analysis of coal rock structurefeatures，established ideal coal rock mass structure model. On the basis of theresults of coal rock specimens indoor single axis、triaxial compression test，makecorresponding2d PFC discrete numerical fitting test，get coal rock mechanicsmesoscopic parameters， to realize the determination of coal rock mechanicsproperties. Make research and analysis of the effect on coal rock mechanicsproperties by different parameters，comprehensively analyse coal rock mechanicsproperties.This paper makes a study of the results：(1)On the basis of plenty of domestic and foreign literature research，hasthoroughly and systematically analysed and researched coal rock reservoircharacteristics，structure characteristics，mechanics characteristic，discrete element numerical simulation method.These lay the foundation for discrete element simulationstudy of coal rock mechanics properties.(2)Make CT scans of coal rock specimens，then obtained coal rock beddingfeatures；Make indoor single axis，triaxial compression test of coal rock specimens，obtained the coal rock strength and deformation characteristics parameters，analysecoal rock mechanics properties，lay the foundation for the numerical simulation.(3) This paper has studied the generative process of micro particle materials ofdiscrete yuan，has simulated coal rock Brazil test model and the mechanicalproperties on three dimensional compression condition，connected coal rock subtlestructure and macroscopic mechanical response closely.(4)Make research and analysis of the effect on coal rock mechanics properties bydifferent parameters.Has analysed numerical experiments of different frictioncoefficient，load rate，particle size，confining pressure，analysed the effect on coalrock mechanics caused by these factors.Made qualitative analysis of the influence oncoal rock specimens failure form and mechanical characteristics from failurepattern，crack spatial form and position.