大型隧道锚施工优化及其稳定性分析

Construction optimizing and stability analyzing for large tunnel anchor

针对隧道锚的施工及支护优化问题,根据坝陵河大桥西锚碇隧道锚工程地质条件、工程设计资料、施工方案以及现场试验监测资料等基础资料,进行了位移反分析;通过对隧道锚施工开挖的仿真分析,综合研究了开挖进尺、施工顺序、锚杆预应力水平等因素对隧道锚围岩开挖变形特征和塑性区分布的影响,从而提出了合理的施工开挖方案以及支护措施,并应用于实际工程施工过程中,结合监测成果评价了隧道锚围岩变形稳定性。此项研究可为同类工程提供参考。

Based on the conditions of engineering geology,the engineering design data,the engineering construction plan and monitoring data of tunnel anchorages in a tunnel at the west of Baling-river suspension bridge,a back analysis of deformation was carried out and some deformation parameters were obtained.With the simulation on the construction of tunnel anchorages,the characteristic of deformation and plastic zones of the tunnel rock-mass under different excavation conditions,different magnitudes of steel-bar pretension were studied.Therefore,the rational excavation and support plans were proposed and applied to the construction of tunnel anchorages.