Abstract: To study the distribution law of the energy that induced rockburst in a coal rock system, the calculation formula of pre-peak energy distribution of binary and ternary combined models was theoretically analyzed. The axial loading experiments of binary and ternary self-constructed combined bodies with different proportions were carried out. The experimental results show that with the increase of coal-rock height ratio, the pre-peak total energy increases, but the increase amplitude decreases gradually. For combined bodies with the same coal-rock height ratio, the harder the rock component is, the smaller the pre-peak total energy will be. Independent of coal-rock height ratios, the proportion of energy stored in the coal component is always higher, which is more than 50%. With the increase of coal-rock height ratio, the proportion of energy stored in the coal component increases gradually, and the proportion of energy stored in the rock component decreases gradually. For combined body with the same coal-rock height ratio, the harder the rock component is, the higher the proportion of energy stored in the coal component will be. The pre-peak energy of a combined body is mainly distributed in the coal component, followed by the gritstone, and the fine sandstone has the least accumulated energy. This shows that the energy in a coal-rock system is mainly distributed in the weak coal-rock strata, the greater the elastic modulus of a rock, the less the amount of accumulated energy. Based on this, two concepts of prevention and control of rock burst, direct release of energy and indirect release of energy, were put forward. The results are of guiding significance to the prevention and control of rock burst in the field.

Key words: rock burst, coal-rock combined body, failure, energy, distribution law