高烈度地震区跨断层隧道围岩注浆抗震效果研究

Study on Anti-seismic Effect of Surrounding Rock Grouting of Fault-crossing Tunnels in Highly Seismic Area

为进一步提高高烈度地震区跨断层隧道的抗震性能,文章依托七达里隧道断层段,利用有限差分数值计算软件对采用不同注浆措施的抗震作用效果进行研究。研究结果表明:(1)跨断层隧道采用全环接触注浆和全环间隔注浆抗震措施,对二衬拱顶竖向位移和边墙收敛的控制效果较为显著;(2)全环间隔注浆在控制隧道结构主应力方面优于全环接触注浆;(3)全环接触注浆最小安全系数抗震效果达8.16%以上,全环间隔注浆最小安全系数抗震效果达18.97%以上;(4)跨断层隧道采用全环间隔注浆抗震措施的作用效果优于全环接触注浆抗震措施。研究成果可为高烈度地震区跨断层隧道的抗震设防设计提供参考。

In order to improve seismic behavior of fault-crossing tunnels in highly seismic area,by using the finite difference numerical calculation software,based on the research background of Qidali tunnel,the effect of the anti-seismic measures with different grouting is studied. The results show that the control effect on vertical displacement and boundary wall convergence of secondary lining vault is significant when the aseismatic methods of the whole chain contact grouting and the whole chain interval grouting in fault-crossing tunnels are used. The whole chain interval grouting is better than the whole chain contact grouting in controlling the main stress of tunnel structure. The anti-seismic effect of minimum safety coefficient of the whole chain contact grouting is more than 8.16%;The anti-seismic effect of minimum safety coefficient of the whole chain interval grouting is more than 18.97%;The effect of adopting the anti-seismic measures of the whole chain interval grouting than the whole chain contact grouting in fault-crossing tunnels. The research results can provide reference for anti-seismic and fortification design of fault-crossing tunnels in highly seismic area.