Many underground engineering projects show that rockburst can occur in rocks at great depth and high temperature,and temperature is a critical factor affecting the intensity of rockburst.In general,tem-perature can affect the energy storage,dissipation,and surplus in rock.To explore the influence of temperature on the energy storage and dissipation characteristics and rockburst proneness,the present study has carried out a range of the uniaxial compression(UC)and single-cyclic loading-unloading uniaxial compression(SCLUC)tests on pre-heated granite specimens at 20 oC-700℃.The results demonstrate that the rockburst proneness of pre-heated granite initially increases and subsequently decreases with the increase of temperature.The temperature of 300℃has been found to be the threshold for rockburst proneness.Meanwhile,it is found that the elastic strain energy density increases linearly with the total input strain energy density for the pre-heated granites,confirming that the linear energy property of granite has not been altered by temperature.According to this inherent property,the peak elastic strain energy of pre-heated granites can be calculated accurately.On this basis,utilising the residual elastic energy index,the rockburst proneness of pre-heated granite can be determined quan-titatively.The obtained results from high to low are:317.9 kJ/m3(300℃),264.1 kJ/m3(100℃),260.6 kJ/m3(20℃),235.5 kJ/m3(500℃),158.9 kJ/m3(700℃),which are consistent with the intensity of actual rockburst for specimens.In addition,the relationship between temperature and energy storage capacity(ESC)of granite was discussed,revealing that high temperature impairs ESC of rocks,which is essential for reducing the rockburst proneness.This study provides some new insights into the rockburst proneness evaluation in high-temperature rock engineering.

Lei Xu;Fengqiang Gong;Zhixiang Liu

School of Resources and Safety Engineering,Central South University,Changsha,410083,China;School of Civil Engineering,Southeast University,Nanjing,211189,China

岩石力学与岩土工程学报（英文版）

[1]Lei Xu;Fengqiang Gong;Zhixiang Liu-.Experiments on rockburst proneness of pre-heated granite at different temperatures:Insights from energy storage,dissipation and surplus)[J].岩石力学与岩土工程学报（英文版）,2022(05):1343-1355

proneness,SCLUC

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