Research on the Rockburst Tendency and AE Characteristics of Inhomogeneous Coal-Rock Combination Bodies

Abstract EN

In order to research the influence of homogeneity on the rockburst tendency and on AE characteristics of coal-rock combination body, uniaxial compressive tests of inhomogeneous coal-rock combination bodies obeyed by the Weibull distribution were simulated using particle flow code ( P F C 2 D ).

Macromechanical properties, energy evolution law, and AE characteristics were analyzed.

The results show that (1) the elastic modulus homogeneity m E has an exponential relation with macroscopic modulus E , and the bonding strength homogeneity m σ has an exponential relation with uniaxial compressive strength σ c ; (2) the rockburst tendency of the coal-rock combination body will increase with the increase of m E or m σ , and m σ is the leading factor influencing this tendency; and (3) both the change law of AE hits and lasting time in different periods of AE characteristics are influenced by m σ , but m E just influences the lasting time.

The more inhomogeneous the coal-rock combination body is, the shorter the lasting time in booming period of AE characteristics will be.

This phenomenon can be used to predict the rockburst tendency of the coal-rock combination body.