中文摘要：

以中国西南高烈度地震区某拟建连拱隧道为背景,提出隧道洞口段2种全环注浆抗震加固方案,即全环间隔注浆和全环接触注浆;并采用三维数值模拟对不同注浆形式和注浆厚度进行了研究。结果表明：连拱隧道全环注浆2种加固形式均能有效减小隧道-围岩系统的动力相互作用,从而提高隧道整体抗震性能;其中全环接触注浆效果最优,全环间隔注浆效果次之,局部注浆效果不明显;全环接触注浆厚度增大到0.5倍开挖宽度以后,注浆效果几乎不变。研究结论对公路隧道抗震设计、施工有一定参考价值。

英文摘要：

Based on the background of a double-arch tunnel which was constructed on high-intensity earthquake zone in southwestern China,two types of grout consolidation projects for tunnel portals,i.e.,the whole chain alternative grouting and the whole chain touch grouting were proposed.Different types and thicknesses of grout were studied by three dimensional numerical simulation.Results show that two types of grout consolidation projects of double-arch tunnel can reduce the dynamic interaction of tunnel and surrounding rock system and improve the whole seismic performance of tunnels.The effect of the whole chain touch grouting is optimal,the effect of the whole chain alternative grouting is better and the effect of local grouting is not obvious.When thickness of whole chain touch grouting reaches 0.5 times of excavation width,the effect of grouting nearly remains unchanged.The research conclusion can provide reference for seismic design and construction of tunnels.