隧道洞口边坡锚索框架梁支护研究

Study on Anchor Cable Frame Beam Support of Tunnel Entrance Slope

近年来,公路隧道的修建在不断地进行中,同时在施工当中也伴随着较大的安全隐忧,因此隧道洞口的边坡支护对于隧道工程具有现实意义。文章以某隧道2号隧道洞口为例,采用FLAC 3D软件进行单因素变量分析不同锚固力、锚固角度和锚固间距对支护体系的影响,在理论计算方法的基础上,结合数值模拟分别在不同锚固力、锚固角度和锚固间距下对预应力锚索框架梁进行模拟计算与分析,最终得出在以上三种情况下的坡面位移图,然后通过观察位移图的变化并结合理论分析提出最优的支护结构参数。文章可为此类隧道工程中预应力锚索框架梁的结构参数优化设计提供技术参考。

In recent years,the construction of highway tunnels has been continuously progressing,and there are also significant safety concerns during construction.Therefore,the slope support of tunnel openings has practical significance for tunnel engineering.The article takes the entrance of Tunnel 2 as an example and uses FLAC 3D software to conduct single factor variable analysis on the influence of different anchoring forces,anchoring angles,and anchoring distances on the support system.Based on theoretical calculation methods,numerical simulations are combined to simulate and analyze the prestressed anchor frame beam under different anchoring forces,anchoring angles,and anchoring distances.Finally,the slope displacement maps under the above three conditions are obtained.Then,by observing the changes in the displacement maps and combining theoretical analysis,the optimal support structure parameters are proposed.The article can provide technical reference for the optimization design of structural parameters of prestressed anchor frame beams in such tunnel engineering.