拉拔荷载下黄土隧道系统锚杆力学特性分析

Mechanical Characteristic Analysis of Systematic Anchor in Loess Tunnel under Drawing Force

基于Mindlin问题的位移解导出了拉拔荷载作用下砂浆锚杆的剪应力分布和轴力分布的弹性解。依托岢临高速公路某黄土隧道,通过现场试验得出边墙系统锚杆的极限拉拔力,分析了拉拔荷载作用下边墙系统锚杆的受力特性;探讨了不同土体性质下砂浆锚杆剪应力及轴力的分布形式。研究成果为黄土隧道系统锚杆的设计和优化提供了理论依据,对设计和施工具有指导意义。

Based on the displacement solution of Mindlin problem,the elastic solution to the distribution of shear stress and axial force is deduced under the drawing load for mortar anchor in loess tunnel.The ultimate drawing load of systematic anchor in the sidewall is measured by means of field test based on a certain loess tunnel in Kelan-Linxian Expressway,and the forcing characteristics of the anchor are analyzed.The distribution forms of the shear stress and axial force are also discussed in different soil characteristics.The obtained results will offer the theoretical basis for the design and optimum of systematic anchor in loess tunnel,which has the guiding significance in the design and construction.