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| True triaxial experimental study of rockburst process under low frequency cyclic disturbance load combined with static load |
| SU Guoshao1，2，HU Lihua1，2，FENG Xiating3，WANG Jinhuan1，2，ZHANG Xiaohe1，2 |
| (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. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract Rockburst process of mid-coarse grained granite specimens was simulated under the cyclic loading of low frequency combined with the static loading using the true triaxial rockburst system developed in-house. The influence of different loading factors on rockburst was studied. When the other load variables were fixed，the axial static stress，the third principal stress and the disturbance amplitude all have a threshold value for rockburst under the cyclic loading of low frequency. If these thresholds were exceeded，the possibility of rockburst increased rapidly and a slight fluctuation of these factors could cause the significant change of the kinetic ejecting energy of rock and the broken degree of fragments. When the other load variables were fixed and the frequency was in the range of 0–3 Hz，the kinetic ejection energy increased first then decreased with the frequency increasing. Enough elastic energy from the static load and suitable energy rate from the cyclic load continuously were the basic condition for the occurrence of this kind of rockburst. Small uprush of the elastic strain energy and the limit of elastic energy storage capacity declined rapidly，what is called the“two-way deviation effect”，is the energy mechanism of the occurrence of this kind of rockburst.
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2016, Vol. 35 
