等代抗剪强度参数取值分析及研究

Analysis and Research on Equivalent Shear Strength Parameter Value

山区输电线路工程推广岩石锚杆基础的关键点之一是如何合理地对等代抗剪强度取值。根据霍克-布朗理论,分析了等代抗剪强度破坏的应力路径,同时以现有的规程公式为参考标准,在各向同性的基础上推导出了等代抗剪强度的经验公式;根据现有的规程规范及结合锚杆基础的破坏模式提出推荐取值表;考虑地质体的复杂性,建议改变锚杆基础的设计模式以适应山区输电线路工程;基于现阶段的研究状况给予电力工程建设使用岩石锚杆基础提出建议。

How to determine the equivalent shear strength is one of the key points for popularizing rock anchor foundation in mountainous power transmission line project.In this paper,the stress path of equivalent shear strength failure is analyzed according to Hork-Brown theory.The empirical formula of equivalent shear strength is deduced on the basis of isotropy using existing code formula as reference standard.The recommended value table is put forward according to existing code and failure mode of anchor foundation.Considering the complexity of geological body,it is suggested to change the design mode of anchor foundation to suit the transmission line project in mountainous area.Based on the current research situation,this paper gives suggestions for using rock anchor foundation in power engineering construction.