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Modern Mining ›› 2024, Vol. 40 ›› Issue (02): 143-147.

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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.
  

  1. 1. Shandong Tangkou Coal Co.，Ltd.; 2. School of Civil Engineering，Nanyang Institute of Technology;
    3.College of Energy and Mining Engineering，Shandong University of Science and Technology
  • Online:2024-02-18 Published:2024-08-14

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Abstract:

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.

Key words:

activation behavior