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| A novel index of rockburst proneness based on maximum energy dissipation rate |
| ZHANG Rujiu1，ZHANG Yanjie2，GAO Tong3，LI Mei2，LIU Yaoru1，ZHANG Kai1 |
| (1. State Key Laboratory of Hydroscience and Engineering，Tsinghua University，Beijing 100084，China；2. Yunnan Dianzhong Water Diversion Engineering Co.，Ltd.，Kunming，Yunnan 650000，China；3. Yunnan Water Diversion Project Construction Administration，Kunming，Yunnan 650051，China) |
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Abstract Rockburst proneness evaluation provides a basis for rockburst risk assessment in deep tunnels. Based on energy dissipation characteristics of complete stress-strain curve of rocks under uniaxial compression，a new evaluation index for rockburst proneness，the maximum energy dissipation rate(the maximum value of time derivative of dissipated energy density)，was proposed in this study. The rationality of proposed index was explained based on stability criteria，experience，and definition of rockburst proneness. To quantitatively calculate the proposed index，an elastic-brittle-damage constitutive model considering void compaction and initial damage was established. To verify the applicability of the proposed index and damage model，uniaxial compression and cyclic loading and unloading tests were conducted on four different rocks(basalt，granite，limestone and sandstone) under rigid and flexible testing machines. Based on the orthogonal tests，correlation analysis and range analysis，the influencing factors of rockburst proneness and internal relationships between different indices were revealed. The results show that，a maximum energy dissipation rate exists in the post-peak stage of rock stress-strain curve，which can be used as an inherent stability indicator to evaluate rockburst proneness. This indicator can both consider the pre-peak energy storage and dissipation characteristics and post-peak characteristics. The proposed elastic-brittle-damage model effectively describes the nonlinear mechanical behavior and intrinsic energy evolution characteristics of rocks. The theoretical curves of stress-strain and dissipated energy density are in good agreement with experimental values. Calculation results of the maximum energy dissipation rate index for different rocks are consistent with the actual rockburst intensity，verifying the reliability of proposed index. Elastic modulus，brittleness，and initial damage are the main influencing factors of rockburst proneness. The proposed index better reflects the influence of rock brittleness on rockburst tendency， and has the strongest correlation with residual elastic energy index(with the correlation coefficient of 0.940). Research results can provide a scientific basis for the reasonable evaluation of rockburst proneness.
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2023, Vol. 42 
