Abstract: When hard rock TBM drives through jointdenselydeveloped hard rock section during the construction of Zhongtianshan railway tunnel, the cutter head and cutting tools are seriously damaged, the driving efficiency is lowered and the construction cost is increased. The modes and causes of the damage of the cutter head and cutting tools are analyzed and countermeasures are proposed. In the end, successful driving through the jointdenselydeveloped hard rock section is achieved, the construction schedule is guaranteed, and the construction cost is reduced. The paper can provide reference for similar projects in the future.

Key words: Zhongtianshan tunnel, jointdenselydeveloped section, hard rock TBM, cutter head, damage mode