大断面浅埋段隧道双侧壁导坑法施工数值模拟  

Numerical Simulation of Double Side Heading Method for Large-section Tunnel

作　　者：朱成豪 ZHU Chenghao(Wenzhou Xinda Transportation Engineering Test Co.,Ltd.,Wenzhou Zhejiang 325000,China)

机构地区：[1]温州信达交通工程试验检测有限公司,浙江温州325000

出　　处：《工程质量》2023年第4期64-68,共5页Construction Quality

摘　　要：以温州某高速公路大断面隧道为依托,采用ANSYS分析软件建立数值模型。通过对隧道洞口浅埋段开挖与支护过程的有限元数值分析,了解围岩和衬砌的位移与应力变化发展规律。分析结果表明:采用双侧壁导坑法和现行支护参数可将变形控制在6 mm以内;隧道开挖后,拉应力主要集中在开挖掌子面底部,施工时应尽早施作左右导坑和主洞的仰拱;临时支撑与初期支护的连接处弯矩较大,导坑上台阶底部临时支撑处后期会出现拉力,应加强对这些部位的安全监控。Based on a large section tunnel of a highway in Wenzhou,the numerical model is established by ANSYS analysis software.Through the finite element numerical analysis of the excavation and support process of the shallow buried section of the tunnel entrance,the displacement and stress law of surrounding rock and lining are understood.The results show that the deformation can be controlled within 6mm by using double side heading method and current support parameters;after the tunnel is excavated,the tensile stress is mainly concentrated at the bottom of the excavation face.During construction,the inverted arch of the left and right guide hole and the main tunnel shall be constructed as soon as possible;The bending moment at the connection between the temporary support and the initial support is large,and the tension will appear in the temporary support at the bottom of the upper step of the guide hole in the later stage.The safety monitoring of these parts should be strengthened.

关 键 词：隧道 双侧壁导坑法 变形 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]