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| Bursting liability index of coal based on nonlinear storage and release characteristics of elastic energy |
| LU Zhiguo1，2，3，JU Wenjun1，2，3，GAO Fuqiang1，2，3，YI Kang1，4，SUN Zhuoyue1，2 |
(1. Coal Mining and Designing Branch，China Coal Research Institute，Beijing 100013，China；2. Coal Mining Research Institute Co.，Ltd.， of CCTEG，Beijing 100013，China；3. State Key Laboratory of Coal Mining and Clean Utilization，China Coal Research Institute，Beijing 100013，China；4. School of Energy and Mining Engineering，China University of Mining
and Technology(Beijing)，Beijing 100083，China) |
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Abstract The bursting liability of coal is an important factor affecting the occurrence of rock burst and the degree of disaster. Bursting liability refers to the property that coal accumulates strain energy and produces impact failure，and hence，elastic energy accumulation at the peak strength is the key to evaluate impact propensity. Due to that there are enormous structural defects in coal，the failure process and energy evolution of coal are very complex. Uniaxial cyclic loading and unloading tests were carried out on standard coal samples to obtain the accumulated elastic strain energy under different stress states. It is found that the variation trend of the elastic strain energy density curve is almost consistent with that of the stress-strain curve，and the elastic strain energy reaches the maximum value at the peak strength moment. It is also shown that the energy input，elastic energy accumulation and energy dissipation have a nonlinear evolution law with the loading deformation of coal samples，but that at an arbitrary time，the stress square and the elastic energy accumulation show a good linear relationship. Based on the improved calculation method of the elastic energy accumulation at the peak strength moment，the elastic strain energy accumulation at the moment of the peak strength can be obtained more accurately. The effective elastic energy release rate index KET，which can comprehensively consider the coal strength，the energy evolution and the failure time，was proposed to evaluate the coal bursting liability，and combined with the existing indexes，the classification critical values of the bursting liability was given. Finally，the rationality of the evaluation results was verified by the fragmentation degree of coal samples(far-field debris mass ratio ω and average particle size da). The research results show that KET can effectively solve the limitations of large dispersion and conflict among existing evaluation results of various indicators. Compared with the failure state of coal samples，KET has positive correlation with ω and fragmentation degree and has negative correlation with da，which is more in line with the reality.
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2021, Vol. 40 
