摘要
为了解决隧道衬砌变形和裂缝病害问题,首先对茜阳隧道病害状况和原因进行分析,提出隧道病害整治方案:换拱方案和明挖方案。然后,通过对塑性区、初期支护内力和安全系数进行数值模拟分析,得出换拱并注浆改善围岩条件是最为有效的方法。最后,提出了综合处理隧道裂缝的具体措施,方案实施后,地表沉降、拱顶下沉、洞周收敛趋于稳定。
Deformation and cracks occur to the lining of Xiyang tunnel.Analysis is made on the defect situation and the causes for the defects,and alternative solutions,i.e.,arch replacing solution and cut-and-cover solution,are proposed.Numerical simulation analysis is made in terms of the plasticized zones,the internal forces of the primary support and the safety coefficient,which concludes that the arch replacing solution plus grouting to consolidate the surrounding rocks is the most effective solution.At last,countermeasures to cope with the cracks are proposed.After the solution is adopted,the ground surface settlement,crown settlement and convergence tend to be stable.
出处
《隧道建设》
2011年第3期396-404,共9页
Tunnel Construction
关键词
茜阳隧道
隧道病害
数值模拟
换拱方案
明挖方案
Xiyang tunnel
defect
numerical simulation
arch replacing
cut and cover method
