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| Research on the effect of joint angle on dynamic responses of rock materials |
| PAN Bo1，WANG Xuguang1，XU Zhenyang2，GUO Lianjun2，3，LI Xiaoshuai2 |
| (1. School of Civil and Resource Engineering，University of Science and Technology Beijing，Beijing 100083，China；2. School of Mining Engineering，University of Science and Technology Liaoning，Anshan，Liaoning 114051，China；3. School of Architecture and Civil Engineering，Shenyang University of Technology，Shenyang，Liaoning 110870，China) |
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Abstract To explore the influence of the joint angle on the dynamic responses of rocks under one-dimensional dynamic load，the split Hopkinson pressure bar(SHPB) was used to carry out impact tests on prefabricated complete specimens and 7 groups of cement mortar specimens with different joint angles. Before and after the tests，nuclear magnetic resonance(NMR) imaging system was used to detect the porosity and pore size distribution of the samples. The influence of the joint angle on the dynamic response characteristics of rock-like materials was systematically analyzed from the aspects of dynamic strength，energy dissipation and meso-damage. The results show that the peak strength of the specimens first decreases and then increases when the joint angle increases from 0° to 90°. The specimens with a joint angle ranging between 45° and 60°are more likely to be damaged than those with other joint angles. The damage of the specimens is positively related to energy absorption. Both the porosity rate and the energy absorption of the specimens present an inverted “U” shape with the joint angle. The specimens with a joint angle ranging from 45° to 60° absorb the most energy，and the change rate of the porosity before and after impact is the most significant. It is concluded that the angle between the directions of the load and the joint，most conducive to crushing，is 30°–45°.
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2021, Vol. 40 
