首页|Tensile strength and failure behavior of rock-mortar interfaces:Direct and indirect measurements

Tensile strength and failure behavior of rock-mortar interfaces:Direct and indirect measurements

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The tensile strength at the rock-concrete interface is one of the crucial factors controlling the failure mechanisms of structures,such as concrete gravity dams.Despite the critical importance of the failure mechanism and tensile strength of rock-concrete interfaces,understanding of these factors remains very limited.This study investigated the tensile strength and fracturing processes at rock-mortar interfaces subjected to direct and indirect tensile loadings.Digital image correlation(DIC)and acoustic emission(AE)techniques were used to monitor the failure mechanisms of specimens subjected to direct tension and indirect loading(Brazilian tests).The results indicated that the direct tensile strength of the rock-mortar specimens was lower than their indirect tensile strength,with a direct/indirect tensile strength ratio of 65％.DIC strain field data and moment tensor inversions(MTI)of AE events indicated that a significant number of shear microcracks occurred in the specimens subjected to the Brazilian test.The presence of these shear microcracks,which require more energy to break,resulted in a higher tensile strength during the Brazilian tests.In contrast,microcracks were predominantly tensile in specimens subjected to direct tension,leading to a lower tensile strength.Spatiotemporal monitoring of the cracking processes in the rock-mortar interfaces revealed that they show AE precursors before failure under the Brazilian test,whereas they show a minimal number of AE events before failure under direct tension.Due to different microcracking mechanisms,specimens tested under Brazilian tests showed lower roughness with flatter fracture surfaces than those tested under direct tension with jagged and rough fracture surfaces.The results of this study shed light on better understanding the micromechanics of damage in the rock-concrete interfaces for a safer design of engineering structures.

Rock-mortarRock-concreteMoment tensor inversion(MTI)Acoustic emission(AE)Digital image correlation(DIC)Tensile strengthDirect tensile testBrazilian test

Ghasem Shams、Patrice Rivard、Omid Moradian

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Civil Engineering and Building Engineering Department,Université de Sherbrooke,Sherbrooke,Québec,Canada

Department of Earth Sciences,Swiss Federal Institute of Technology(ETH),Zurich,Switzerland

Department of Civil and Environmental Engineering,Colorado School of Mines,Golden,CO,USA

Natural Sciences and Engineering Research Council(NSERC)of Canadaprogram and the Fonds the Recherche du Québec-Nature et Technologies(FRQNT)for financing the research infrastructure

2024

10.1016/j.jrmge.2023.04.013

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(1)
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