A new criterion of rock burst proneness based on residual energy release rate index  

作　　者：Guangbo Chen Jing Zhang Wei Tang Tan Li Guohua Zhang 

机构地区：[1]School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou,014010,China [2]College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao,266590,China [3]School of Mining Engineering,Heilongjiang University of Science and Technology,Harbin,150022,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第12期5004-5026,共23页岩石力学与岩土工程学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52304142);basic scientific research fees of colleges and universities directly under Inner Mongolia Autonomous Region(Grant No.2023QNJS108).

摘　　要：The natural property of rock material,whether impact occurs,is the key influencing factor of the occurrence of rock burst disaster.To accurately assess rock burst proneness,this study focuses on typical sandstone as the research object.Uniaxial cyclic loading and unloading tests were conducted to measure the elastic strain energy accumulated in sandstone under different stress levels and a relationship between elastic strain energy and stress level was established.The results show that:(1)The peak stress under cyclic loading and unloading conditions is slightly lower than the uniaxial compressive strength.With an increase in the number of cycles,the internal damage of sandstone continues to accumulate,and the mechanical properties such as compressive strength continue to deteriorate;(2)With an increase in stress,the input strain energy,elastic strain energy,and dissipated strain energy also increase;(3)When the stress is low,the increase in elastic strain energy is large and shows a steady growth;with an increase in stress,the increase of elastic strain energy decreases;(4)The square of stress at any time has a good linear relationship with elastic strain energy.According to the relationship obtained from the test,the elastic strain energy at the peak stress time can be obtained;(5)A new criterion for assessing rock burst proneness is proposed:residual energy release rate index W_(T),which characterizes the energy release per unit time when the rock burst occurs.The intervals for evaluating the rock burst proneness of the residual energy release rate index W_(T) are as follows:W_(T)<0.025,indicating no rock burst proneness;0.025≤W_(T)<0.15,indicating weak rock burst proneness;0.15≤W_(T)<2,indicating medium rock burst proneness;W_(T)>2,indicating strong rock burst proneness;and(6)The rationality of the proposed residual energy release rate index W_(T) is verified by the multi-index method and the multi-sample method,and the proposed residual energy release rate index is used to determine the rock burst pronene

关 键 词：Energy storage law Rock burst proneness Rock-burst criterion Elastic strain energy Residual energy release rate Rationality verification 

分 类 号：TU45[建筑科学—岩土工程]