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| Research on evaluation method of rock burst tendency based on improved comprehensive weighting |
| LI Kegang1，2，LI Mingliang1，2，QIN Qingci1，2 |
| (1. Kunming University of Science and Technology，School of Land and Resources Engineering，Kunming，Yunnan 650093，China；
2. Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space，
Kunming，Yunnan 650093，China) |
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Abstract In order to solve the problems of the large randomness of index weight calculation leads to low prediction accuracy in rock burst tendency evaluation and the judgment of the rock burst propensity level is too singular，etc. An evaluation method of rock burst propensity based on improved comprehensive weighting is proposed. The 15 factors corresponding to lithological conditions，stress conditions and surrounding rock conditions are comprehensively selected as the judgment index of rock burst tendency，and then applying comprehensive weighting method to obtain comprehensive weight. On this basis，the cloud normal model and ideal point method were used to evaluate the rock burst tendency of specific engineering cases respectively，to judge the level of rock burst tendency，and to verify the accuracy and reliability of the method. The results show that five indicators have a greater impact on rock burst propensity which are the energy storage consumption index k，T criterion，dynamic DT parameters，elastic energy index Wet and stress index S，the index weight result calculated by the improved comprehensive weighting method is more reasonable. Compared with the ideal point method，the evaluation result of the rock burst propensity grade obtained by the cloud normal model is more accurate. The research results will provide new ideas for the prediction of rock burst propensity for geotechnical engineering such as mines，tunnels and hydropower stations.
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2020, Vol. 39 
