Insulation and water seepage compound culvert for deep cutting in alpine permafrost region and its construction method

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a thermal insulation and water seepage composite culvert for a deep road cutting in an alpine permafrost region and a construction method thereof. Background technique [0002] In the alpine permafrost region, the size and distribution of water content in the deep cutting soil layer and the seasonal change of the external temperature are the main factors affecting the stability of deep cutting. For the groundwater deep cutting in the alpine permafrost region, if it is soaked by groundwater for a long time, the water will damage the stability of the deep cutting project in different ways and to varying degrees. [0003] The project adopts the design principle of protecting permafrost in the low temperature stable area and low temperature basic stable area, and adopts the design principle of delaying the melting speed of permafrost in the high temperature ...

AI Technical Summary

Problems solved by technology

This method alleviates the damage of groundwater to the stability of deep cuttings to a certain extent, but it cannot prevent the influence of warm air in the upper layer on the permafrost below. Although the groundwater is dredged, the thermal stability of the permafrost below cannot be guaranteed.

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