对拉塞梅尔隧道PK26某段围岩大变形的认识

Understanding of Adjacent Rock Large Deformation of a Section at Pk26 in Tunnel Ras RMel

地中海边上的地层岩性存在其特殊性,尤其是软弱破碎粘土岩的工程地质性质值得探讨。通过对摩洛哥拉塞梅尔隧道PK26+960～+980段围岩进行掌子面素描编录,初衬开裂观察,以及对监控量测资料的总结,对该段隧道出现的围岩大变形进行机理分析,并根据实际施工需要提出相应的预防和补救措施,为同类隧道施工遇软弱围岩引起大变形问题提供了一个参考实例。

The rock deformation character is particular beside the Mediterranean Sea,especially the engineering geology feature of weak and fractured claystone there is worthy of discussion.By geology description of working face, observation measurement of early supporting,and generalization of monitoring data of adjacent rock at Pk26+960 to Pk26+980 section,in tunnel Ras R'mel,the reason why large deformation occurred is analyzed for the section.The preventive and remedial measures are suggested according to practical construction requirement.A reference example is given for similar tunnel construction when large deformation may be generated at weak and fracture rock.