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| VIBRATION RULE AND DAMAGE OF ANCHORAGE STRUCTURE SUBJECTED TO BLASTING USING MODEL TEST |
| ZHOU Jijun1，WANG Xiaogang1，JIA Zhixin1，KONG Xiangsong2，XIA Yu2，GENG Huihui2，LIU Lipeng1 |
| (1. Department of Geotechnical Engineering，China Institute of Water Resources and Hydropower Research，Beijing 100048，China；2. School of Mechanical and Civil Engineering，China University of Mining and Technology，Beijing 100083，China) |
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Abstract In this paper，cement mortar and glass fiber reinforced plastics are used in physical model test to simulate the rock and anchor bolt，respectively. Physical model tests are performed according to similarity law of materials. Vibration rule and damage of different sections of anchorage structure are studied under cut-hole blasting in combination of test，theory and practice. The vibration strain signals are implemented by wavelet packets analysis. The results show that：(1) Under the blasting loading，vibration rules of the anchored and free sections(a row of anchor bolts in the vicinity of working face) are different in frequency，amplitude，duration and waveform. Vibration energy of the row of anchor bolts is basically large，but the energy is distributed randomly with a wide frequency band. (2) With increase of the distance from the working face，amplitude and frequency of vibration strain wave decrease rapidly on anchored and free sections. Vibration energy concentrates in narrow frequency band，but with longer duration. Based on different failure patterns，suggestions are proposed to prevent structure from damage by controlling amplitude，main frequency band and duration of vibration. In addition，anti-dynamic performances of structure should be improved.
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Received: 11 January 2013
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2013, Vol. 32 
