摘要
为探索动荷载作用下锚固缺陷对锚固锚杆结构粘结滑移性能的影响,分析锚固界面的粘结性能及损伤机理,阐明加载速率、锚固缺陷长度对锚杆受力的影响规律,本研究对含有锚固缺陷的锚固锚杆结构进行动态数值试验研究。结果表明:锚固锚杆结构粘结强度随加载速率的增大而增加,随锚固缺陷长度的增加而减小;当加载速率为5000 mm/s时,锚固锚杆结构的动态强度增长因子为3.01,具有明显的加载速率效应。在锚杆拉拔过程中,随锚固缺陷长度的增加,锚固锚杆结构的峰值载荷呈现递减趋势,而界面剪切力呈增加趋势。不同加载速率下,随锚固缺陷长度的增加,锚固锚杆结构峰值荷载位移逐渐降低,锚固界面粘结强度也随之逐渐降低,锚固界面失效面积增加。
To explore the influence of grouted defects on the bond-slip performance of grouted rockbolt structures under dynamic loads,analyze the bonding performance and damage mechanism of the grouted interface and clarify the influence of loading rate and bond defect length on the stress of rockbolt,the dynamic numerical experimental research on grouted rockbolt structures containing grouted defects was conducted in this paper.The results show that the bonding strength of grouted rockbolt structure increases with the increase of loading rate and decreases with the increase of grouted defect length;When the loading rate is 5000 mm/s,the dynamic strength increase factor of the grouted rockbolt structure is 3.01,which has a significant loading rate effect.During the pull-out process of rockbolt,as the length of the grouted defect increases,the peak load of the grouted rockbolt structure shows a decreasing trend,while the interface shear force shows an increasing trend.At different loading rates,as the length of the grouted defect increases,the peak load displacement of the grouted rockbolt structure gradually decreases,the bonding strength of the grouted interface also gradually decreases,and the failure area of the grouted interface increases.
作者
陆书灿
于水生
张鸿森
赵庆祥
LU Shucan;YU Shuisheng;ZHANG Hongsen;ZHAO Qingxiang(School of Architecture and Engineering,Zhongyuan University of Technology,Zhengzhou 451191,China;Henan Engineering Research Center of Mechanics and Engineering Structures,Zhengzhou 451191,China)
出处
《金属矿山》
CAS
北大核心
2024年第8期183-190,共8页
Metal Mine
基金
国家自然科学基金项目(编号:52104157)
中原工学院“青年骨干教师培养计划”项目:(编号:2023XQG13)
中原工学院“学科青年硕导培育计划”项目(编号:SD202424)。
关键词
锚固缺陷
锚固锚杆结构
动态拉拔
数值模拟
bond defect
grouted rockbolt structures
dynamic pullout
numerical simulation
作者简介
陆书灿(1999-),男,硕士研究生;通信作者:于水生(1988-),男,副教授,博士,硕士研究生导师。
