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| A preliminary study on the effect of the support system stiffness on the microseismic characteristics of rockburst |
| MA Chunchi1，2，LI Tianbin1，2，ZHANG Hang1，2，HAN Yuxuan3，ZHOU Xionghua3 |
| (1. College of Environment and Civil Engineering，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；3. Sichuan Baxia Expressway Co.，Ltd.，Chengdu，Sichuan 610041，China) |
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Abstract Rockburst cases of tunnel engineering show that the type and stiffness of initial support system affect the characteristics，mechanism and stage development of fracture and microseismic activities of surrounding rock mass，which is a topic less discussed and needs to be fully revealed. Based on the rockburst phenomena and microseismic monitoring results of tectonic granulite section in the Micang mountain tunnel of Bazhong-Shanxi expressway，the evaluation method of composite stiffness by surrounding rock and support structures is proposed and the influence of support structure stiffness on the rockburst characteristics is explored based on the microseismic parameters. The evolution of rockburst characteristics with the stiffness condition changing from weak to strong is revealed as follows：(1) At the development stage of rockburst，a more rigid constraint condition is applied on the unloading boundary of surrounding rock，and the fracturing activity of surrounding rock tends to the effect of energy accumulating and energy transferring. The development period of rockburst is prolonged and the type and specific gravity of microseismic events are changing. (2) At the occurrence stage of rockburst，the fracturing activity of surrounding rock tends to produce higher energy release，and the field rockburst hazard show the characteristics of wider affected range by high energy shock. Microseismic events occur rapidly in a short time，and the event rate and energy rate are greatly increased. Finally，the research results can help to understand the characteristics，mechanism and development stages of rock fractures under the influence of support system，and to consider the influence of supporting system on the early warning criterion of surrounding rock failure. It hopes to provides practical data and theoretical reference for scientific and reasonable support ways to curb the risk of rockburst.
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2019, Vol. 38 
