Experimental simulation of impact response identification on circular hole cavern rock mass

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (4) : 136-141.

TAN Zhuoying，WU Bin，XIA Zhiyuan，DING Yu，QI Kuan，LI Wen，YUE Pengjun

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Abstract

Cavities are a usual structure in natural geology and rock engineering.In order to simulate the response characteristics of rock mass with an opening circular hole structure under high speed impact loading, granite samples with tunnel-like structure were designed and processed.An improved impact dynamics simulation test system was employed to measure the stress wave in experimental bar for the structural rock samples at the different positions parallel and perpendicular to the axis of the cavity under progressive cycle impact loads.The results show that peak reflected stress ratio is independent of the impact energy; however, specific reflected strain energy decreases with the impact energy.The void structure has little effect on the response of reflected stress wave under low impact energy.With the increase of impact energy, the influence of the void structure on the response increases.The ratio of specific strain energy but not the peak stress ratio significantly increases after the rock samples were spalled.The impact failure of rock occurs along the axis of the tunnel-like structure and is independent of the loading points.It indicates specific strain energy ratio may be proposed to be the response indicator of rock cavity structure failure, which provides the theoretical basis for identification of a cavern structure as well as its protection while drilling.

Key words

granite / cavern structure / impact energy / specific strain energy / response identification

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TAN Zhuoying，WU Bin，XIA Zhiyuan，DING Yu，QI Kuan，LI Wen，YUE Pengjun. Experimental simulation of impact response identification on circular hole cavern rock mass[J]. Journal of Vibration and Shock, 2020, 39(4): 136-141

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