The invention relates to a heat-preservation and water-seepage compound type blind
ditch of a
deep trench of a severely cold and frozen earth area and a construction method of the heat-preservation and water-seepage compound type blind
ditch. The structure mainly comprises a water separation layer, a lower heat-preservation layer, a waterproof
geotextile, a flag stone layer, a non-woven
geotextile inverse filtering layer, a concrete base, a water drainage
pipe, a medium-coarse sand
cushion layer, a round gravel soil layer, an upper heat-preservation layer, a foundation
bed, a
geogrid, a slope
protection layer, a flag stone air outlet hole, a top sealing layer, an edge slope backfilling layer and a slope
protection layer. The construction method mainly comprises the following construction steps: spreading the water separation layer, digging a step, spreading the lower heat-preservation layer, spreading the waterproof
geotextile, mounting the water drainage
pipe, mounting the
geogrid, spreading the flag stone layer, spreading the non-woven geotextile inverse filtering layer, spreading the round gravel soil layer, spreading the top sealing layer, spreading the upper heat-preservation layer and backfilling the foundation
bed. The construction method provided by the invention is simple and the construction efficiency is high; the obtained heat-preservation and water-seepage compound type blind
ditch of the
deep trench of the severely cold and frozen earth area has stable quality, has advantages of good heat-preservation effect, high water-seepage efficiency and the like, has relatively good economic and technical benefits and is worthy of being popularized and applied.