摘要
白山左线隧道施工中,针对塌方发展过程和塌方机理,实施了一套基于"地表排水、围岩注浆、衬砌增强、基底防降"的塌方综合治理方案。文章分析了方案实施后的地表沉降、拱顶下沉、拱腰和边墙水平收敛的位移变化规律,以及初期支护背后水压力、初期支护与围岩的接触应力、锚杆轴力、型钢拱架应力及二次衬砌混凝土应力的发展趋势。结果表明:在软弱围岩地段,拱墙二次衬砌的施作显著改善了初期支护与围岩的接触应力,有效地减小了地表沉降及隧洞周边位移;同时,拱墙二次衬砌能有效地分担锚杆和型钢拱架的的部分荷载,改善仰拱二次衬砌的受力状况;塌方综合治理方案效果较好,保障了该隧道剩余塌方段的安全施工。
According to the development and mechanism of a collapse in the left bore of the Baishan tunnel, a comprehensive treatment scheme, which covers surface drainage, rock mass grouting, lining reinforcement and base settlement prevention, is put forward. After the implementation of this scheme, an analysis of the rules of surface subsidence, crown settlement, horizontal convergence at the haunch and side wall is performed, and the development tendencies of the water pressure behind the primary support, contact stress between the primary support and surrounding rock, axial force of the anchor, stress on the profile steel arch and stress on the secondary concrete lining are discussed. The results show that the secondary lining at the arch walls improves the condition of contact stress between the primary support and surrounding rock in a weak surrounding rock section, decreases the surface subsidence and peripheral displacement, effectively shares part of the load on the anchor and steel arch, and improves the force state of the secondary lining of the invert. With good implementation of this scheme, safe construction of the remaining sections is guaranteed.
出处
《现代隧道技术》
EI
北大核心
2014年第2期157-166,共10页
Modern Tunnelling Technology
基金
国家自然科学基金资助项目(50878213)
湖南省研究生创新基金项目(CX2013B078)
广东省公路管理局科技项目(2011-14)
关键词
隧道塌方
处治方案
监控量测
Tunnel collapse
Treatment technique
Monitoring and Measuring
