耦合效应下压力型锚索锚固机理的近似理论分析  

Approximate theoretical analysis on anchorage mechanism of pressure-type anchor under coupling effect of pre-stress and creep of rock

作　　者：叶红[1,3] 陈燕平[2,3] YE Hong;CHEN Yanping(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China;School of Transportation Engineering,Wuhan Technical College of Communications,Wuhan 430065,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]武汉大学土木建筑工程学院,湖北武汉430072 [3]武汉交通职业学院交通工程学院,湖北武汉430065

出　　处：《人民长江》2020年第5期178-183,共6页Yangtze River

基　　金：国家自然科学基金资助项目(51374163);湖北省自然科学基金资助项目(2014CKB499);湖北省教育厅科学技术研究计划指导性项目(B2018492);武汉交通职业学院科研创新团队建设项目(CX2018B07)。

摘　　要：为了更加精确地研究压力型锚索的锚固机理,基于锚索预应力与岩土体蠕变的耦合效应推导了锚索预应力方程。在此基础上根据Mindlin问题解,推导了耦合效应作用下锚索砂浆体的压应力和剪应力近似解,并考虑锚索预应力与岩土体蠕变之间的耦合效应进行了案例分析。研究结果表明:锚索预应力和砂浆体受到的应力峰值均按反幂函数随时间逐渐衰减并稳定;承压板的长宽比与压应力峰值之间存在正相关关系,与剪应力峰值之间存在负相关关系;岩土体的泊松比与应力峰值之间存在正相关关系。该成果丰富了压力型锚索锚固机理的理论研究,可为边坡锚固设计提供一定的理论依据。In order to analyze anchorage mechanism of pressure-type anchor cable theoretically and precisely,the prestress equation of anchor cable were derived based on the coupling effect of anchor cable prestress and soil creep.Pressure stress expression and shear stress expression of anchor cable mortar were derived based on coupling effect and numerical solution of Mindlin.A case was analyzed under the coupling effect of anchor cable prestress and soil creep.The results showed that the prestress of anchor cable and stress peaks on mortar body attenuated and stabilized,showing an inverse power function change over time.There was a positive correlation between the aspect ratio of the plate and the pressure stress peak,and a negative correlation between the aspect ratio of the plate and the shear stress peak,and there was a positive correlation between Poisson ratio and stress peak.The theoretical research on anchorage mechanism of pressure anchor cable was enriched by this study,providing a theoretical basis for the slope anchorage design.

关 键 词：压力型锚索 锚索预应力 蠕变 Mindlin问题 

分 类 号：TU457[建筑科学—岩土工程]