深埋隧洞中黏结型锚固系统的黏结性能研究

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Study of the bonding performance of bonded anchorage systems indeep-buriedtunnels XIA Hongchun12， YAN Huajun'， ZHU Xunguo1，，ZHANG Chuanqing³， GUO Lijunt4， XUE Ziqian' （1.School of Architectural Engineering，Dalian University，Dalian ， China;2.Liaoning Provincial Key Laboratory of Complex Structure Disaster Prediction and Prevention，Dalian University，Dalian，China;3.Institute ofRock andSoilMechanics，Chinese Academyof Sciences， Wuhan 43o064， China; 4.Inner Mongolia Guodian Energy Investment Company Limited，Alxa ，China）

Abstract：In order to investigate the bonding performance of bonded anchorage systems in deep-buried tunnels and ensure the safety during the excavation of deep tunnels，this study takes the high-stress conditions of the No. 2 diversion deep-buried tunnel at Jinping Second Hydropower Station as a research background.The bonding performance during tunnel excavation and anchor pul-out processes was studied by combining numerical simulation，experiment and monitoring.The study analyzed the variation patterns ofstresstates in surrounding rock at different depths.Based on the stress conditions obtained，a physical model of the anchorage system was constructed toanalyze the load-displacement evolution characteristicsatthe interface betweenthe anchor rod and grouting body during the pull-out process.The research results show that after excavation，the stress of the surounding rock is redistributed，with the confining pressure generally increasing with depth，and the inhomogeneity and local instability of the surrounding rock stress occurring.As the resistance of surrounding rock increases，the peak shear stress of the bonded anchors rises.After reaching the peak value，the shear stress decreases more rapidly.The force process of the anchor can be categorized into three phases： the elastic phase， the plastic softening phase，and the complete sliding phase，culminating in complete failure.When the diameter difference between the anchor rod and grouting body is about 6～9mm ， the bonding performance is optimal. The model precision was confirmed through the integration oflab testingand on-site monitoring data.This study can provideareference for theapplication of bonded anchors in deep-buried tunnelsand other underground engineering projects.

Keywords：anchor system;surrounding rock; shear stress; diameter difference; bonding performance;deep-buried tunnel

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中国岩体工程建设规模位居世界第一。（剩余14591字）