Abstract:

Due to the action of high ground stress, bedding strata and unsymmetrical loading, huge deformation occurs to the primary reinforcement structure of Gonghe tunnel during construction. The features of the deformation are presented, the causes for such geological diseases are analyzed, different construction options are compared and proper construction countermeasures are proposed. The treatment of the huge deformation is described. The paper can be served as reference for the determination of construction schemes for tunnels in similar geological conditions in the future.

Key words: tunnel, high ground stress, primary reinforcement, huge deformation, treatment technology