半成岩隧道斜井结构受力分析及参数优化研究  

Study on Force Analysis and Parameter Optimization of Semi-diagenetic Tunnel Inclined Shaft Structure

作　　者：胡强 杨洪[1] 杨春平[1] 曹琨 HU Qiang;YANG Hong;YANG Chunping;CAO Kun(Guizhou Provincial Traffic Planning Survey Design&Research Institute Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《交通科技》2023年第5期81-86,共6页Transportation Science & Technology

基　　金：贵州省重大科技专项计划项目(黔科合重大专项字[2018]3011)资助。

摘　　要：结合某隧道斜井穿越半成岩的建设背景,采用数值模拟手段对隧道斜井支护结构初支钢构件受力、初支混凝土受力及二衬结构受力进行系统分析,进而提出相关参数优化的建议,结果表明,受施工工艺影响,初期支护在钢构件接头位置存在相对明显的应力集中现象,为结构的相对软弱薄弱点,宜采用锁脚管棚进行加强;受结构拐角影响,初支混凝土在拱脚位置可能出现外表面局部拉裂现象,施工过程中宜采取加劲肋等形式加强该部位的拱架连接质量;隧道斜井初支钢构件未屈服、初支喷射混凝土未产生横向贯缝、二次衬砌的安全系数在规范允许范围内,隧道支护结构的整体可靠性有所保障。Combined with the construction background of a tunnel inclined shaft passing through semi-diagenetic rock,the stress of the initial steel member,the stress of the initial concrete support and the stress of the secondary lining structure of the tunnel inclined shaft supporting structure were systematically analyzed by numerical simulation,and then the relevant parameter optimization suggestions were put forward.The results indicate that due to the influence of construction technology,there is a relatively obvious stress concentration phenomenon in the initial support at the joint position of steel members,so the locking pipe shed should be used to strengthen the structure.Due to the influence of the structural corner,the initial concrete may have local tensile cracking phenomenon on the outer surface of the arch foot.In the construction process,stiffener and other forms should be adopted to strengthen the arch joint quality at this part.The initial steel member of the inclined tunnel shaft is not yielding,the initial shotcrete does not produce the transverse joint,and the safety factor of the secondary lining is within the allowable range of the code.The overall reliability of the tunnel supporting structure is guaranteed.

关 键 词：隧道工程 数值模拟 应力集中 局部拉裂 

分 类 号：U451[建筑科学—桥梁与隧道工程]