考虑地震作用的山岭隧道空洞加固方案优化研究

以福建省道206线龙门隧道病害治理工程为托依,运用FIAC^3D软件对不同加固方法处理龙门隧道衬砌背后空洞进行了抗震稳定性计算,并对各种方法的抗震加固效果定量的进行了对比分析。计算结果表明:回填注浆加固可降低隧道衬砌的加速度和主拉应力响应,改善衬砌内部的应力和弯矩分布;锚杆和套拱的施加可改变隧道围岩的最大主应力频谱特性;采用回填注浆+砂浆锚杆+套拱组合加固方法治理龙门隧道,其抗震加固效果最为理想。研究成果对高烈度地震区地下工程抗震加固具有一定的借鉴意义。

Research on Optimized Tunnel Cavity Reinforcement Scheme Considering the Earthquake Action

Based on the damage treatment project of Longmen Tunnel at the Fujian provincial highway 206, the anti-seismic stability of Longmen tunnel with different reinforcement methods to deal with the cavity behind the lining was analyzed by FLAC^3Dsoftware, and the effect of all kinds of anti-seismic hardening methods was studied quantitatively. The results show that, the backfill grouting consolidation can reduce the acceleration response of tunnel lining and principal tensile stress, improve the distribution of stress and bending moment of internal lining, the maximum principal stress spectrum characteristics of surrounding rock can be changed with adding anchor and cover arch. The effect of earthquake resistance using the combined reinforcement method of backfill grouting, rock bolt and reinforced concrete arch is optimal in this project. The results are useful for the anti-seismic strengthening of underground projects in high-intensity earthquake areas.