(1. School of Civil Engineering and Architecture，Wuhan University of Technology，Wuhan，Hubei 430070，China；
2. Shaanxi Geotechnical Engineering Construction Group Co.，Ltd.，Xi?an，Shaanxi 710075，China)
Abstract：To overcome the deficiency of the existing test devices and methods for rock burst modeling，a gas-liquid composite loading test device was developed to conduct the large size rock burst modeling under different stress gradients. In this paper, the occurrence，development processes and failure mechanism of the rock burst were studied through the analysis of the macroscopic failure features，interior deformation characteristics and the acoustic emission characteristic parameters of the sample. The results show that the occurrence of rock burst is closely related to the stress gradient，the energy concentration degree and the energy release rate during the rock burst processes. The differences of load gradient difference in the model test lead to the different concentration degree of internal stresses. These differences also influence the energy dissipation and agglomeration of the specimen in the early stage and the energy release rate at the moment of rock burst. If the difference of the vertical fracturing load gradient becomes greater，the degree of the local stress concentration becomes higher and the energy release rate will be faster. At the same time，the energy converted into the kinetic energy will increase and the probability of rock burst will be larger. When the specimen is broken，the ratio of the maximum vertical load on the top to the uniaxial compressive strength R is . Under the gradient loading condition，the static and dynamic composite loading is the main reason for the reduction of the failure load capacity of the specimen.
王贤能. 动力扰动对岩爆的影响分析[J]. 山地研究，1998，16(3)：188-192.(WANG Xianneng. Analysis of the influence of disturbance on rock the dynamic burst[J]. Mountain Research，1998，16(3)：188-192.(in Chinese))
[1]
张镜剑，傅冰骏. 岩爆及其判据和防治[J]. 岩石力学与工程学报，2008，27(10)：2 034-2 042.(ZHANG Jingjian，FU Bingjun. Rock burst and its criteria and control[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(10)：2 034-2 042.(in Chinese))
[4]
章奇锋，周春宏，周 辉，等. 锦屏二级水电站辅助洞岩爆灾害评价及对策研究[J]. 岩土力学，2009，30(2)：422-445.(ZHANG Qifeng，ZHOU Chunhong，ZHOU Hui，et al. Research on rock burst estimation and control measures for auxiliary tunnels in Jinping II hydropower station[J]. Rock and Soil Mechanics，2009，30(2)：422-445.(in Chinese))
[5]
陈卫忠，吕森鹏，郭小红，等. 脆性岩石卸围压试验与岩爆机理研究[J]. 岩土工程学报，2010，32(6)：963-969.(CHEN Weizhong，LU Senpeng，GUO Xiaohong，et al. Unloading confining pressure for brittle rock and mechanism of rock burst[J]. Chinese Journal of Geotechnical Engineering，2010，32(6)：963-969.(in Chinese))
<body>Your browse does not support frame!</body>
