This invention relates to the field of
engineering construction technology, specifically a construction method for a tunnel on a high slope. The method includes: S01, excavating the top of the tunnel and providing slope support; S02, excavating the right side of the tunnel and providing temporary support; S03, excavating the left side of the tunnel and providing initial support, pre-anchor support, and temporary
steel frame support; S04, pouring the left tunnel structure and bottom slab; S05, constructing temporary
steel frame support and dismantling the existing temporary
steel frame support; S06, constructing the right tunnel structure; S07, constructing ancillary structures such as drainage ditches, cable trenches, and road surfaces within the tunnel; S08, backfilling and counter-pressure at the top of the tunnel, constructing a top seepage-proof layer, drainage ditches, and
landscaping. This invention reduces excavation volume, minimizes damage to the
natural environment of the mountain, avoids slope deformation and
instability caused by
prolonged exposure, and ensures the safe and smooth progress of the project. It also avoids structural damage to the tunnel due to water accumulation and insufficient backfill compaction.