地震作用下压力型锚索锚固段受力状态理论分析  

Theoretical Stress Analysis of Anchorage Section of PressureAnchor Cable under Earthquake

作　　者：叶红[1,2] 陶廷权[3] 李艳[1,2] YE Hong;TAO Ting-quan;LI Yan(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;School of Transportation Engineering,Wuhan Technical College of Communications,Wuhan 430065,China;CCCC-FHDI Engineering Co.,Ltd.,Guangzhou 510230,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]武汉交通职业学院交通工程学院,武汉430065 [3]中交第四航务工程勘察设计院有限公司,广州510230

出　　处：《长江科学院院报》2023年第4期107-112,118,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(11672185,52174085);湖北省教育厅科学技术研究计划指导性项目(B2021520)。

摘　　要：为更加精确地研究地震作用下压力型锚索的锚固机理,根据Mindlin基本解,结合单自由度体系的有阻尼强迫振动特点,推导了压力型锚索锚固段注浆体受到的压应力表达式和锚固段较软岩体与注浆体之间剪应力表达式。通过算例分析了简谐荷载的幅值、简谐荷载的圆频率以及低阻尼体系的阻尼比等因素对压力型锚索加固效果的影响。研究结果表明:简谐荷载的幅值和圆频率对压力型锚索加固效果影响较大,低阻尼体系的阻尼比对压力型锚索加固效果影响较小;简谐荷载的幅值与注浆体受到的应力呈线性关系;简谐荷载的圆频率与压力型锚索体系的有阻尼自振圆频率越接近,注浆体受到的应力越大。研究成果可为压力型锚索加固岩土体的抗震设计提供一定的理论参考。The aim of this study is to obtain the anchorage mechanism of pressure cable under earthquake more accurately.Considering the damped forced vibration characteristic of the single freedom degree system,we derived the compressive stress and shear stress expressions of the grout of anchorage section of pressure anchor cable based on the basic solution of Mindlin.The influences of harmonic load amplitude,harmonic load circular frequency,and damping ratio on the reinforcement effect of pressure anchor cable are examined through an example.The results show that the amplitude and circular frequency of harmonic load have a greater influence on the reinforcement effect of pressure anchor cable,while the damping ratio of low damping system has little effect.Harmonic load amplitude has a linear relationship with compressive stress and shear stress of grout in anchorage section.When the circular frequency of harmonic load is closer to the damped natural circular frequency of the pressure anchor cable,the compressive stress and shear stress of grout in anchorage section are larger.The research finding offers a theoretical reference for rock-soil reinforcement with pressure anchor cable under earthquake.

关 键 词：岩土工程 压力型锚索 锚固机理 MINDLIN解 简谐荷载 

分 类 号：TU457[建筑科学—岩土工程]