Acoustic Emission Monitoring Test on the Effect of Top - to - Surface Interaction on Filling Body - Surrounding Rock
Received:February 21, 2017  Revised:March 24, 2017
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KeyWord:backfill; connection top; stability; ultrasonic; acoustic emission; crack propagation
Wang Mingxu 武汉科技大学 资源与环境工程学院
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      Through the similarity principle, the indoor experiment of the interaction between the filling body and the surrounding rock is simulated, and the position of the acoustic emission point, the number of events and the energy are monitored by the acoustic emission instrument. The strength reduction coefficient and the damage variable are introduced to establish the damage variable and the strength The relationship between the coefficient of filling, the filling of the empty area is not connected, the top, filling the empty area to reduce and fill the three kinds of internal damage and overall stability. At the same time, the ultrasonic wave was used to test the changes of sound wave values before and after failure. The experimental results show that the filling point is not filled with the filling space. Under the loading action, the acoustic emission point mainly occurs at the interface between the filling interface and the surrounding rock. When the filling empty area is filled with the top, the acoustic emission point mainly occurs at the contact surface between the filling body and the surrounding rock. When the area of the filling area decreases, the overall stability of the surrounding rock increases, and the acoustic emission occurs mainly in the local area where the filling body exists. Compared with the non-connected, the top of the filling body - the surrounding rock community more energy storage capacity, the corresponding resistance to stress generated by the internal damage and energy release more powerful.