The Experimental Study On The Physical And Mechanical Properties Of Coal Under The Environment Of Soak Environment

Coal and rock mass is always in a certain geological environment during mining engineering,due to the complex conditions of occurrence,making the coal affected by flooding,load and other factors at the same time.At present,there are many researches on the single factor influencing the strength of coal and rock,and few studies on the coupling of multiple factors.So the study on the mechanical properties of coal under hydrodynamic coupling has important theoretical and practical value.Based on flooding test and uniaxial compression test of raw coal in Liang shui coal mine,the main mechanical parameters of coal and rock are obtained.Based on the combination of damage mechanics theory and experimental study,the mechanical properties and damage evolution laws of coal and rock under different immersion time and load are systematically studied.The site of raw coal processing into a standard specimen,Uniaxial compression test of different coal rock specimen under immersion time by measuring the longitudinal wave velocity group.The relationship between water quality,elastic modulus,peak stress,peak strain and longitudinal wave velocity is discussed and discussed with the experimental data.The Poisson distribution damage variables are deduced,and the Weibull and Poisson distributions are used to describe the stochastic properties of the coal-rock micro – strength.The damage model of coal and rock is established,and the rationality of the model is verified by the experimental data.The differences between the two different random distributions in describing the compression and failure of coal.The physical and mechanical properties of coal rock specimens under hydrodynamic coupling are studied experimentally,and the combination of theory and experiment is studied.The damage data of damage process of coal and rock under the action of hydraulic coupling are in good agreement with the theory,which can provide some reference for practical engineering.The damage evolution equation and damage constitutive relation of coal and rock under hydrodynamic coupling are established and modified.The physical meaning of the model parameters is analyzed and discussed,The constitutive model of rock damage was validated by flooding test data.The results show that which can reflect the change of the stress and strain curve of coal and rock and more accurately describe the coal stress after the peak stress strain.