Experimental study on mechanical and failure behavior of rock-concrete interface in coal mine roadway under direct tension
Weiyue Bao1
Heping Xie1
Tao Zhou1
Dongya Han2
Xiaoling Zhao3
Jianbo Zhu1
1.Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,China2.School of Resources and Safety Engineering,Central South University,Changsha,China3.State Key Laboratory of Hydraulic Engineering Simulation and Safety,School of Civil Engineering,Tianjin University,Tianjin,China
摘要：The rock-concrete interface has a significant influence on the stability of rock-concrete structures in coal mine roadway that are vulnerable to tensile loads.In this study,direct tension tests in combination with laser scanning and acoustic emission techniques were used to study the influences of loading angle and strength contrast on tensile behavior of rock-concrete interface.Results show that peak strain and tensile strength of granite-concrete specimens are lower than those of granite and concrete.Acoustic emission(AE)characteristic of the granite-concrete specimens differs from that of concrete and granite.With the loading angle increases,peak strain and tensile strength of the granite-concrete specimens increase,and the failure mode varies from the interfacial tensile failure to mixed tensile failure due to the increased contact area and decreased tensile stress applied on the granite-concrete interface.In addition,the accumulative AE counts of the granite-concrete specimen are also significantly affected by the loading angle;in particular,when the loading angle is sufficiently large,e.g.,55°,the accumulative AE counts sharply increase twice.Different strength contrasts between rock and concrete result in different failure characteristics of rock-concrete specimens under direct tensile loads.When tensile strength of rock is lower than that of concrete,failure often occurs in the rock section and the tensile strength and peak strain of the rock-concrete specimen is similar to that of rock.By contrast,when the tensile strength of rock is higher than of the concrete,failure appears at the interface,and rock-concrete interface dominates the tensile properties of rock-concrete specimens.The failure mode is domi-nated by the coupling effect of loading angle and strength contrast.The findings in this study are helpful in understanding the mechanical behaviour of rock-concrete structures under direct tension and applicable to the design and reinforcement of rock-concrete structures in coal roadway.
机标关键词：interfacebehaviordirectstudyminecoalexperimentalfailure
论文发表日期：2025-10-31
在线出版日期：2026-01-31（本平台首次上网日期，不代表文献的发表时间）
页数：16( 164-179 )
英文信息