Gneiss water-rich tunnel primary support surface deformation control structure

A gneiss water-rich tunnel primary support surface deformation control structure comprises a primary primary support structure, a secondary primary support structure and bottom plate concrete. And when the deformation of the primary primary support structure exceeds the designed reserved deformation amount and convergence deformation still continuously occurs, a secondary primary support structure is arranged on one side of the primary primary support structure, and bottom plate concrete is arranged on one side of the secondary primary support structure. According to the gneiss water-rich tunnel primary support surface deformation control structure, the stability of a primary support structure after tunnel excavation is enhanced. 片麻岩富水隧道初支面变形控制结构，包括一次初支结构、二次初支结构及底板混凝土；在一次初支结构变形超出设计预留变形量且收敛变形仍持续发生时，在一次初支结构一侧设置二次初支结构，二次初支结构一侧设置底板混凝土。本实用新型提供的片麻岩富水隧道初支面变形控制结构，加强隧道开挖后初期支护结构稳定性。