深埋引水岔管围岩稳定三维数值分析

Three-dimensional numerical analysis on stability of surrounding rock of deeply buried water-diversion bifurcation

深埋引水岔管结构复杂,洞室围岩稳定分析和支护设计是重点研究对象。结合工程实例,利用FLAC 3D(Fast Lagrangian Analysis of Continua)有限差分软件构建三维数值模型,通过反演分析模拟初始地应力场,对洞室开挖、衬砌支护、运行和放空等工况进行数值模拟,并研究分析不同工况下围岩特性和锚杆受力情况。结果表明,实施锚杆支护有效控制了围岩位移,改善了围岩应力状态,起到了良好加固作用,有利于围岩稳定,可为同类工程设计和施工提供参考。

The structure of deeply buried water-diversion bifurcation is complex.The stability analysis of surrounding rock and anchor design are the key research objects.The three-dimention numerical model is built with the finite-difference software FLAC 3D by engineering examples.The initial geostress field is simulated through inversion analysis.Different work conditions such as construction、lining support、operation and inspection are analyzed.The work behaviors of the underground caverns and the result of anchor stress is analyzed.The results show that the anchor reinforcement has played a good role which control the displacement of surrounding rock and improve the stress state of surrounding rock.These measures are conducive to the stability of the surrounding rock.The achievements have a certain value for the similar projects,which can provide reference for design and construction in the future.