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CONTENTS
Volume 76, Number 2, October25 2020
 

Abstract
Aiming at the mechanical and structural characteristics of the contact zone composite rock, the shear tests and numerical studies were carried out. The effects of the differences in mechanical properties of different materials and the normal stress on shear properties of contact zone composite samples were analyzed from a macro-meso level. The results show that the composite samples have high shear strength, and the interface of different materials has strong adhesion. The differences in mechanical properties of materials weakens the shear strength and increase the shear brittleness of the sample, while normal stress will inhibit these effect. Under low/high normal stress, the sample show two failure modes, at the meso-damage level: elastic-shearing-frictional sliding and elastic-extrusion wear. This is mainly controlled by the contact and friction state of the material after damage. The secondary failure of undulating structure under normal-shear stress is the nature of extrusion wear, which is positively correlated to the normal stress and the degree of difference in mechanical properties of different materials. The increase of the mechanical difference of the sample will enhance the shear brittleness under lower normal stress and the shear interaction under higher normal stress.

Key Words
contact zone composite rock; difference in mechanical properties; contact interface; shear properties; failure mode

Address
Yicheng Ye, Qihu Wang: 1School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430-081, China
2Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan, 430-081, China
3Industrial Safety Engineering Technology Research Center of Hubei Province, Wuhan 430-081, China
Weiqi Wang, Xiaoyun Liu: 1School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430-081, China
2Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan, 430-081, China
Fan Yang and Wenkan Tan: School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430-081, China


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