Experimental study on dynamic tensile strength of bimaterial Brazilian disc under different loading rates

被引：0

作者：

Qiu H. ^{[1
,2
]}

Zhu Z. ^{[1
,2
]}

Zhang R. ^{[1
,2
]}

Wang M. ^{[1
,2
]}

Wang F. ^{[1
,2
]}

Luo C. ^{[3
]}

Wang X. ^{[1
,2
]}

机构：

[1] College of Architecture and Environment, Sichuan University, Chengdu, 610065, Sichuan

[2] MOE Key Laboratory Deep Underground Science and Engineering, Sichuan University, Chengdu, 610065, Sichuan

[3] Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Fujian University of Technology, Fuzhou, 350118, Fujian

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2020年 / 39卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Bi-material Brazilian Disc(BBD); Brazilian disc; Impact load; Interface roughness; Interface transition zone; Rock mechanics; Tensile strength;

D O I：

10.13722/j.cnki.jrme.2019.1189

中图分类号：

学科分类号：

摘要：

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 stressτxy exists in the center of the disk model and is far less than the tensile stress σx, 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. © 2020, Science Press. All right reserved.

引用

页码：1175 / 1188

页数：13

共 45 条

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