苏家湾隧道初期支护变形侵限处理措施及施工工艺的研究

摘要

文章针对苏家湾隧道发生的初期支护变形侵限的病害，通过对隧道洞身地质条件的分析，并利用有限元软件MIDAS-GTS对隧道初期支护结构及二次衬砌进行了验算，确定出控制隧道初期支护变形的支护参数；并提出施工前加强对隧道中线顶部地表的地形地貌调查，完善排水系统、隧道内加强支护系统、适当加大预留变形量，并加强监控量测等施工工艺和处理措施。%In light of the clearance intrusion of the primary support in the Sujiawan tunnel, this paper determines relevant parameters for controlling support deformation based on checking the support structure and secondary lining with MIDAS-GTS software and analyzing the geological conditions of the tunnel body. Reasonable countermeasures are proposed after the analysis of required construction technologies, including strengthening geological surveys of the top of the tunnel's central line, improving the drainage system, enhancing the support system with an increased reserved deformation allowance, and intensifying tunnel monitoring and measurements.