(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese
Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：According to mechanism，characterization and law of rockburst evolution process，a three-step strategy to control rockburst was firstly proposed. It includes the first step to optimize excavation schemes to reduce concentration of stress and energy induced by the excavation；the second step to pre-release and transfer energy concentration；and the third step to absorb energy stored in rock mass by designing reasonable rockbolts and other support types. And then a dynamic control method of rockburst evolution process is proposed. During the construction，the real-time microseismicity monitoring is used to perform warning of rockburst. The feedback analysis and dynamic control strategy if needed can be conducted to perform the three-step control strategy of rockburst evolution process. The proposed method has been successfully used in Jinping II deep headrace and water drainage tunnels with depths of 1 900–2 525 m. The practice verified the applicability of the proposed method.
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2012, Vol. 31 
