基于参数反演的经高聚物注浆修复脱空后隧道二次衬砌的地震反应分析

Seismic Response Analysis on the Secondary Lining with Voids Repaired with Polymer Grouting of Tunnels Based on Inversion Analysis of Parameters

隧道衬砌背后的脱空现象已经成为隧道病害的主要诱因,易引发隧道衬砌结构破坏、脱落、渗水等病害,严重威胁隧道的正常运营。衬砌背后的脱空大大削弱了隧道的抗震能力。通过优化改进系统识别灵敏度分析方法,反演计算了围岩的力学参数,并利用改进后的反演结果优化了隧道动力响应数值模型,在此基础上研究了经高聚物注浆修复衬砌背后脱空区后龙眠山隧道的修复效果和抗震能力。结果表明:隧道二次衬砌顶部脱空区域在注浆修复后,位移和应力明显减小,接近于正常情况;但在不同场地条件同一峰值的地震波作用下,二次衬砌顶部的应力、位移均存在明显的差异,说明该隧道模型的动力响应具有明显的地震波频谱敏感性。

The void phenomenon behind the tunnel lining has become the main cause of tunnel diseases, which easily triggers the damage of tunnel lining structure, shedding, water seepage and other diseases, and seriously threatened the normal operation of tunnels. The void behind the lining seriously reduced the aseismic capacity of tunnels. The mechanical parameters of surrounding rock were calculated in inversion by the optimizing analysis method of improved system identification sensitivity, and the numerical model for the dynamic response of tunnels was optimized by the improved inversion results to study the repair effect and aseismic capacity of the Longmianshan tunnel repaired the void behind the lining grouted by polymer. The results showed that the displacement and stress in the repaired zone at the top of the secondary lining of the tunnel were significantly reduced and close the normal;however, there were significantly different in the stress and displacement at the top of the secondary lining subjected to seismic waves of the same peak acceleration in different site conditions, indicating that the dynamic response of the tunnel model had significant sensitivity to the seismic wave spectrum.