中文摘要：

基于连拱隧道洞口端存在严重偏压和边坡高陡现象,设计一种新颖特殊隧道——耳墙式隧道,即在深埋侧设计隧道浅埋侧路堑的结构形式。以常德—吉首高速公路殿会坪隧道为工程背景,建立有限元数值计算模型,针对洞口边坡不同的地形偏压率P=7.0,P=4.0,P=2.5对应3种工况分析研究隧道围岩、耳墙和支护结构典型断面的受力特征,优化该隧道的设计和施工工序。研究结果表明地形偏压率P=4.0时结构受力比较合理,也进一步验证了该工程设计的合理性。

英文摘要：

Tunnel with ear wall is a new special tunnel in highways,and it is applied to the end or exit of unsymmetrical pressure mutil-arch tunnel.According to a case study of Dianhuiping multi-arch tunnel project,a FEM model for tunnel with ear wall is established.Mechanical characteristics of surrounding rock,ear wall and supporting structure are analyzed based on different ratios of unsymmetrical pressure P（P=7.0,P=4.0,P=2.5）.Design and construction procedures of the tunnel with ear wall are optimized.Research results show that mechanics of surrounding rock,ear wall and supporting structure are reasonable when the ratio of unsymmetrical pressure is 4.0,and prove that the design of the tunnel with ear wall is successful and reasonable.