Mechanical behavior and strength model of anchored mortar-rock composite under triaxial compressionOA
Anchor-shotcrete support has been widely applied in underground rock mass engineering globally,where the anchoring of bolts plays a crucial role in stabilizing the mortar-rock interface.In this study,triaxial compression tests were conducted on anchored mortar-rock composite specimens under varying confining pressures,and the failure mechanisms of the anchored mortar-rock composites were investigated using acoustic emission(AE)and three-dimensional morphology scanning techniques.The results indicate that the bolt inclination angle significantly influences the plastic deformation and compressive strength of the mortar-rock composites during triaxial compression tests.The composite specimens with a bolt inclination angle of 90°between the bolt and the mortarrock interface exhibited the optimal load-bearing performance.As the confining pressure increased,the anchored mortar-rock composites primarily underwent plastic deformation,reducing the property differences caused by varying bolt angles.The bolt angles led to four distinct failure modes in the mortar-rock composites.The acoustic emission(AE)signals during the tests demonstrated that the mortar-rock composites with a bolt inclination angle of 90°exhibited the highest stability.Additionally,the study revealed that the morphological parameters of the mortar-rock interface varied positively with the bolt inclination angle.Finally,a strength model for the anchored mortar-rock composites under triaxial compression was derived.The reliability of the strength model was validated by comparing the experimental results with the model predictions under four different confining pressures.
Minzhen Zhang;Yanlin Zhao;Wenyu Tang;Rui Luo;Tianyao Li;Ximing Luo
School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan,411201,China School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing,100083,ChinaSchool of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan,411201,ChinaSchool of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan,411201,ChinaSchool of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan,411201,ChinaSchool of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan,411201,ChinaSchool of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan,411201,China
建筑与水利
Mortar-rock interfaceTriaxial compressionBolt inclination angleMechanical propertiesStrength model
《Rock Mechanics Bulletin》 2026 (2)
P.157-170,14
financially supported by the National Natural Science Foundation of China(grant number 52274118,52574143)。
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