| Dynamic mechanical properties and wave propagation of composite rock-mortar specimens based on SHPB testsOA |
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| 引用本文： | Zhenyu Han,Diyuan Li,Xibing Li. Dynamic mechanical properties and wave propagation of composite rock-mortar specimens based on SHPB testsOA[J]. 矿业科学技术学报(英文版), 2022, 32(4): 793-806. DOI: 10.1016/j.ijmst.2022.05.008 |
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| 作者姓名： | Zhenyu Han Diyuan Li Xibing Li |
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| 作者单位： | 1. School of Resources and Safety Engineering, Central South University;2. School of Civil Engineering, Southeast University;3. Department of Civil Engineering, Monash University |
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| 基金项目： | supported by the National Natural Science Foundation of China (No. 52074349)；;Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX21＿0119)；;Hunan Provincial Natural Science Foundation (No. 2019JJ20028)； |
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| 摘 要： | Filled inclusions in rock discontinuities play a key role in the mechanical characteristics of the rock and thereby influence the stability of rock engineering. In this study, a series of impact tests were performed using a split Hopkinson pressure bar system with high-speed photography to investigate the effect of interlayer strength on the wave propagation and fracturing process in composite rock-mortar specimens.The results indicate that the transmission coefficient, nominal dynamic strength,...
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| 收稿时间： | 2021-07-07 |
Dynamic mechanical properties and wave propagation of composite rock-mortar specimens based on SHPB tests |
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| Affiliation: | 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;2. School of Civil Engineering, Southeast University, Nanjing 210096, China;3. Department of Civil Engineering, Monash University, Melbourne, Victoria 3800, Australia |
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| Abstract: | Filled inclusions in rock discontinuities play a key role in the mechanical characteristics of the rock and thereby influence the stability of rock engineering. In this study, a series of impact tests were performed using a split Hopkinson pressure bar system with high-speed photography to investigate the effect of interlayer strength on the wave propagation and fracturing process in composite rock-mortar specimens. The results indicate that the transmission coefficient, nominal dynamic strength, interlayer closure, and specific normal stiffness generally increase linearly with increasing interlayer stiffness. The cement mortar layer can serve as a buffer during the deformation of composite specimens. The digital images show that tensile cracks are typically initiated at the rock-mortar interface, propagate along the loading direction, and eventually result in a tensile failure regardless of the interlayer properties. However, when a relatively weaker layer is sandwiched between the rock matrix, an increasing amount of cement mortar is violently ejected and slight slabbing occurs near the rock-mortar interface. |
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| Keywords: | Rock dynamics Wave propagation Rock-mortar Stiffness Energy Fracturing |
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