小净距隧道抗震安全性分析及支护方法研究

Seismic Safety Analysis and Support Method Research of Small Interval Tunnel

楚雄至大理高速公路改扩建工程勘察试验段第四标段(九顶山隧道进口段)为双洞隧道工程,文章利用有限元软件Abaqus建立数值模型,研究地震效应对双线隧道位移及应力的影响,提出了相应的支护措施并验证。结果表明,距离震源较近的隧道受到的影响较大,位移影响为距震源较远隧道的1.3倍,应力则相差不大。对隧道施加小导管注浆进行支护比施加锚杆更能防止地震效应对隧道造成的影响,而当使用注浆锚杆时,起到的防护效果更加明显。当锚杆为5.5m时,此工程的支护效果最好。

The fourth bidding section(Jiudingshan tunnel entrance section)of the investigation test section of Chuxiong to Dali Expressway Reconstruction and Extension Project is a double-tunnel project.The finite element software ABAQUS is used to establish a numerical model to study the impact of seismic effect on the displacement and stress of the double line tunnel,and the corresponding support measures are proposed and verified in the paper.The results show that the displacement effect of the tunnel closer to the earthquake source is 1.3 times that of the tunnel farther away from the earthquake source,but the stress difference is not significant.The small pipe grouting is applied to support the tunnel for preventing the impact of earthquake effect more effectively than applying anchor bolts,and the protective effect is more obvious when grouting anchor bolts are adopted.When the bolt is 5.5m,the support effect of the project is the best.