受拉全长黏结式锚杆剪切应力弹性解析解及其应用

Analytical Solution of Shear Stress and Elasticity of Tensile Full-length Bonded Anchor Bolt and Its Application

面对锚杆-围岩锚固界面剪切应力分布研究不够精确,制约锚杆设计施工水平提高的现状,基于半无限弹性空间体的Mindlin位移解,导出了拉拔荷载作用下全长黏结式锚杆锚固界面剪切应力沿杆长分布的近似弹性解析解,并求得了最大剪切应力的数值和分布位置,给出锚杆杆长的建议值和增强局部剪切力的建议。结论适用于较硬围岩中较长锚杆在较小荷载作用下的剪切应力分析,可为岩体锚固设计提供借鉴,提高锚杆设计施工的安全性和经济性。

Currently,the not-accurate research of shear stress distribution at the anchor bolt-surrounding rock interface restricts the improvement of the design and construction of the anchor bolt.Based on the Mindlin displacement solution of semi-infinite elastic space,this paper derived the approximate elastic analytical solution of the shear stress distributing along the bolt length of the anchorage interface of the full-length bonded anchor bolt under the pull-out load,and the value and distributed location of the maximum shear stress were obtained.The recommended bolt length and the suggestion to improve local shear stress were proposed.The conclusions can be applied to the analysis of the shear stress of longer anchor bolts in harder surrounding rocks under small loads,providing a reference for the rock anchorage design and improving the safety and economy of the anchorage design and construction.