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| Experimental study on dynamic tensile strength of bimaterial Brazilian disc under different loading rates#br# |
| QIU Hao1，2，ZHU Zheming1，2，ZHANG Renfan1，2，WANG Meng1，2，WANG Fei1，2，LUO Caisong3，WANG Xingyu1，2#br# |
(1. College of Architecture and Environment，Sichuan University，Chengdu，Sichuan 610065，China；2. MOE Key Laboratory Deep Underground Science and Engineering，Sichuan University，Chengdu，Sichuan 610065，China；3. Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering，Fujian University of Technology，Fuzhou，Fujian 350118，China)
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Abstract Mortar is widely used in rock engineering，such as mortar jet supporting tunnel and landslide grouting reinforcement. Due to the change of temperature，the interface transition zone between rock and mortar is easy to form the weak area of micro cracks. At the same time，the underground rock structure often bears the dynamic load such as blasting，impact and earthquake. Therefore，it is of great significance to study the strength and failure characteristics of the interface transition zone between rock and mortar. In this paper，a rock-mortar bimaterial Brazilian disk configuration is proposed，and the impact experiments of bimaterial Brazilian disk with two kinds of interface roughness(smoothness and roughness) are carried out by using the split Hopkinson compression bar system. At the same time，in order to compare the difference of failure performance between single material and bimaterial，Brazilian disc specimens of single granite，sandstone and mortar were also prepared. In order to overcome the problem of uneven stress distribution of the bimaterial Brazilian disc，the central tensile strength of the disc was determined by the experimental numerical method. In addition，two kinds of numerical models are built with Python language to simulate the failure process of bimaterial ITZ. The results show that，when the dynamic loading rate is the same，the interface roughness has little effect on the strain rate of the specimen but has a greater impact on the tensile strength of the specimen，and that，compared with the granite-mortar bimaterial specimen，the interface roughness has a greater impact on the dynamic initial tensile strength of the sandstone-mortar bimaterial specimen. It is also shown that，based on the numerical model，the shear stress exists in the center of the disk model and is far less than the tensile stress，and that the failure phenomenon of the numerical model embedded with cohesive element are close to that of the test specimen，which verifies the effectiveness of the method.
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2020, Vol. 39 
