Experimental study of ejection process in rockburst
SU Guoshao1，2，JIANG Jianqing1，2，FENG Xiating3，MO Chun1，2，JIANG Quan3
(1. School of Civil and Architecture Engineering，Guangxi University，Nanning，Guangxi 530004，China；2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education，Guangxi University，Nanning，Guangxi 530004，China；
3. Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：Experimental study on the ejection process of strain rockburst in coarse-grain granite using the rigid true-triaxial test machine for rockburst developed in house was presented. The processes of ejecting failure in focused energy driven rockburst and in concentrated stress driven rockburst were respectively simulated with different loading and unloading paths. The speed of rock fragments was recorded with the high speed camera system and the characteristics of rockburst were analyzed. Rockburst was found to have four typical stages such as small grain ejections，spalling，shearing rock into fragments and fragments ejection. The failure of the specimen after rockburst had a V-shaped notch or sidestep-shaped notch near the free face and a shear zone away from the free face. Loading rate had important influence on the concentrated stress driven rockburst. The kinetic energy had an increasing trend with the increasing of loading rate ranging from 0.05 MPa/s to 2 MPa/s. Gathering enough elastic strain energy and inputting energy with enough high rate in the pre-peak are essential conditions for stress concentration driven rockbust. Whether it is the focused energy driven rockburst or the concentrated stress driven rockburst，less than 1% of released elastic strain energy in the pre-peak was translated into the kinetic energy.
苏国韶1，2，蒋剑青1，2，冯夏庭3，莫 纯1，2，江 权3. 岩爆弹射破坏过程的试验研究[J]. 岩石力学与工程学报, 2016, 35(10): 1990-1999.
SU Guoshao1，2，JIANG Jianqing1，2，FENG Xiating3，MO Chun1，2，JIANG Quan3. Experimental study of ejection process in rockburst. , 2016, 35(10): 1990-1999.
谢和平. 岩爆的分形特征和机理[J]. 岩石力学与工程学报，1993，12(1)：28-37.(XIE Heping. Fractal character and mechanism of rockbursts[J]. Chinese Journal of Rock Mechanics and Engineering，1993，12(1)：28-37.(in Chinese))
[4]
谭以安. 岩爆形成机理研究[J]. 水文地质工程地质，1989，16(1)：34-38.(TAN Yi?an. The mechanism research of rockburst[J]. Hydrogeology and Engineering Geology，1989，16(1)：34-38.(in Chinese))
[1]
钱七虎. 地下工程建设安全面临的挑战与对策[J]. 岩石力学与工程学报，2012，31(10)：1 945-1 956.(QIAN Qihu. Challenges faced by underground projects construction safety and countermeasures[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(10)：1 945-1 956.(in Chinese))
<body>Your browse does not support frame!</body>
2016, Vol. 35 
