预应力锚索内锚段复合单元模型研究  

Composite element model research on inner anchoring section of prestressed anchor cable

作　　者：张雄[1] 陈胜宏[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《岩土力学》2012年第3期933-938,共6页Rock and Soil Mechanics

基　　金：国家"十一五"科技支撑计划(No.2008BAB29B01);武汉大学博士研究生科研自主基金(No.20102060101000058)

摘　　要：针对预应力锚索内锚段模拟存在的困难,提出用复合单元模型来研究内锚段,为解决这一问题提供了一种新思路。该模型最突出的优点是既可以反映钢绞线、砂浆和接触面等细部结构,又可以简化网格。为检验其正确性,进行了有限元精细化模拟,将钢绞线、砂浆、接触面等细部结构精细离散。结果显示,内锚段轴向位移和应力沿钢绞线方向由外到里呈指数衰减,一般内锚段不是越长越好,3～5 m左右较为合适,这与现场监测规律相吻合。算例验证了这种方法是合理和有效的。Aiming at the simulation problems on the inner anchoring section of prestressed anchor cable,composite element model is presented,which provides a new idea to solve this problem.The most remarkable feature of the model is that it not only can describe steel strand wire,mortar,interfaces and other detailed structures,but also simplify calculation mesh.Elaborate simulation is conducted in order to verify the new method.Steel strand wire,mortar,interfaces and other structures are discretized in detail.The results show that the axial displacement and stress are exponential decreasing along the steel strand wire from outside to inside.The longer inner anchoring section is not better for anchoring effect,but it is more suitable for 3-5 m.These are proved by field monitoring.Numerical example is carried out to display the validity and rationality of the method.

关 键 词：岩石力学 内锚段 复合单元模型 

分 类 号：TU45[建筑科学—岩土工程]