Experimental study on prediction of mechanical properties of coal gangue based on porosity and particle sizes
The significant correlation between the pore structure and mechanical properties of porous media rocks is a subject of in-depth study.This research specifically focused on typical sandstone sam-ples obtained from coal mining waste in the Shanxi-Shaanxi area of China.By employing a range of methods including sieving tests,mercury intrusion porosimetry,X-ray diffraction analysis,and uniaxial compression tests,the study analyzed the strength and basic physicochemical properties of rocks under different porosity levels.Through the application of SPSS statistical principles,a pore strength predic-tion model was developed,exploring the impact of porosity distribution parameters on the mechanical properties of porous sandstones.The results show that the porosity significantly affects the failure state of the sample.The smaller the porosity of the rock mass,the more sufficient the cementation between the particles,the larger the contact area,the closer the arrangement,the lower the porosity,and the higher the compressive strength.The highest significance rate of linear correlation is found to be porosi-ty of-0.929,followed by elastic modulus of-0.762 and apparent density of-0.587.The porosity is significantly negatively correlated with the compressive strength of rock.The prediction accuracy R2 is 0.896,and the Spearman correlation coefficient is-0.954.The study explains the influence of pore structure parameters on the mechanical properties of rock,providing important reference for the rapid e-valuation and prediction model of rock strength.
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