Study on Mechanical Characteristics of Failure and Instability of Coal-Rock Composite Structure Under Uniaxial Compression
Due to the difference of strength and dip angle,the mechanical properties of coal-rock combination will change significantly.In order to explore the mechanical properties of coal-rock combina-tion failure and instability,uniaxial compression test was carried out by numerical test method to analyze its failure and instability characteristics.The results show that there are two kinds of failure and instability char-acteristics of coal-rock composite structure:one is crushing instability,which is mainly manifested as the crushing of coal and rock mass.The other is slip instability,which is mainly manifested in the slip of the structural plane of coal and rock mass.The structural strength of coal-rock combination is related to the li-thology with small strength in the combination,and is not affected by the lithology with high strength.The small angle contact surface of coal rock mainly occurs crushing instability,and the large angle contact sur-face mainly occurs sliding instability.
coal-rock combination structurefailure and instabilitydamage evolutionmechanical activation behavior
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