输电线路岩石锚杆基础载荷试验研究

针对岩石锚杆基础应用于实际输电线路工程中所面临的问题，为其设计提供基础承载力、锚筋与混凝土间粘结强度等参数，进行了真型岩石锚杆基础在竖向上拔或上拔与水平复合作用工况下的载荷试验。基于基础的典型破坏表现形式、荷载–位移关系和锚筋应变－埋深关系等结果，分析了基础的主要破坏状态和承载特性，以及锚筋传递荷载的特性。研究结果表明，岩石锚杆基础可应用于中风化、强风化的基岩分布地区，满足输电线路上部结构对基础承载力的要求，具有良好的经济和社会效益。荷载～位移关系曲线存在明显第一拐点，对应位移小于10mm，基岩风化程度越高基础承载力越小且位移越大，水平荷载对群锚基础上拔稳定性存在不利影响。

Loading Test of Rock Anchor Foundation for Transmission Lines

In view of the questions for the rock anchor foundation used in the actual transmission line project, and the need to provide the supporting capacity, the bond strength between anchor bar and concrete and so on for the rock anchor foundation design, loading test was carried out for real foundations in working conditions of the vertical uplift or the three-directions loading. Based on the model failure manifestation of foundations, the load-displacement relations, the anchor bar strain-buried depth relations and so on, have analyzed the main failure state and the load-supporting characteristics, as well as the anchor bar transmission load characteristic. The findings indicated that the rock anchor foundation may be used in the medium and strong weathered rock distribution region, and has the good economy and the social efficiency. There is an obvious first inflection point in the load-displacement curves, corresponding to the displacement of less than 10mm. the higher degree of weathered bedrock is, the smaller foundation bearing capacity is, and the greater displacement is. And the horizontal load has the adverse effect to uplift stability the group anchor foundation.