單軸壓縮下裂隙煤體能量演化與數(shù)值模擬

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中圖分類號(hào)：TD712 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：1672-9315（2025）04-0692-12

DOI：10. 13800/j. cnki. xakjdxxb.2025.0406

Energy evolution and numerical simulation of fractured coal under uniaxial compression

XIAO Peng'，LI Bingkun'， HUANG Xiaosheng'， ZHANG Xinyang'， CHEN Zixi'， BU Xiongfei2

（1.College of Safety Science and Engineering，Xi’an UniversityofScience and Technology，Xi’an71Oo54，China; 2.Shaanxi Chenghe Shanyang Coal Mine Co.， Ltd.，Weinan 7153Oo， China）

Abstract：To investigate the influence of diferent crack angles on the stability of coal，uniaxial compression tests were conducted on coal samples containing cracks at various angles.The study focused on the effects of crack angles on the mechanical properties，acoustic emission characteristics，energy evolution，and crack propagation of coal.Numerical simulations were also employed to analyze the changes in stress and displacement fields during the damage process of coal with different crack angles.The results indicate that as the crack angle increases，the peak stress and elastic modulus of the coal increase in a quadratic relationship.The evolution of acoustic emission energy in coal with different crack angles can be divided into three stages： slow development，rapid development，and intense development.The cumulative acoustic emission energy increases linearly with the crack angle. More than 75% of the total energy absorbed before the peak can be converted into elastic energy stored in the coal， while less than （204號(hào) 25% of the total energy is disspated before the peak.As the crack angle increases，the elastic energy absorbed by the coal before the peak gradually increases，and the degree of energy release at failure also increases accordingly.The crack angle has a certain influence on the development of diffrent types of cracks;the smaler the crack angle，the more complex the types of cracks in the coal. During the loading processthe range of tensile stress concentration in the coal is larger than that of compressive stress concentration.As the crack angle increases，the range of stress concentration in the coal significantly decreases，and the degree of coal degradation caused by cracks is reduced.The findings provide a reference for further exploration of the energy evolution laws in cracked coal.

Key Words： prefabricated cracks; energy evolution; crack evolution; failure mode; numerical simulation

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