基于粘结-滑移模型的新型输电线路装配式岩石锚杆基础设计研究

Research of a new prefabricated rock bolt foundation design for transmission lines based on bond-slip model

新型输电线路装配式岩石锚杆基础由预装地脚螺栓的预制柱、预制底板、连接钢板和锚筋,通过灌浆形成整体。有限元仿真考虑了材料非线性,建立了第一、二锚固界面的粘结-滑移模型,研究了基础在上拔及水平荷载作用下的力学响应。结果显示:基础满足承载力要求,关键节点及相关构件保持弹性状态,具有传力直接有效、施工质量好、进度快、易于后期模块化预制等优点。同时还编制了系列通用设计图、施工方案及智能配置程序。

The new type of prefabricated rock anchor foundation consists of prefabricated columns with anchor bolts,prefabricated bottom plates,connecting steel plates and anchor bars,which are integrated by grouting.In the finite element simulation,the material nonlinearity of the anchor bars was considered,the bonding and slip models of the first and second interfaces of the anchor bars were established,and the mechanical response of the foundation under uplift and horizontal load was studied.The results showed that:the foundation met the bearing capacity requirements,the key nodes and related components maintained the elastic state,with direct and effective force transmission,easy modular prefabrication,good construction quality,fast progress and other advantages.Also,a series of general design drawing,construction scheme and intelligent configuration program had been compiled.