The present application relates to the technical field of
underground tunnel construction, in particular to a kind of construction method of tunnel hard rock. The upper bench excavation working face is sequentially divided into advance
pilot hole milling face and expansion face from left to right, and parallel construction of advance
pilot hole and expansion is adopted. Through
zoning operation of excavation working face, parallel operation of advance
pilot hole excavation and initial support can be realized, effectively avoiding the influence time of traditional upper bench support, ensuring the overall construction progress of the tunnel; the tunnel hard rock advance
pilot hole expansion construction method of the present application uses drilling + breaking hammer excavation for expansion face, reduces the amount of upper bench milling, reduces the consumption of
cutting teeth, has lower comprehensive cost, reduces dust generation, is beneficial to
environmental protection, and has higher use value compared with the traditional bench method milling process.