A method for heat preservation, anti-seepage and anti-frost heave of canal foundation soil heat preservation and anti-frost heave phase change insulation board in salty cold area

Abstract

The invention discloses a thermal insulation and anti-frost heave phase-change thermal insulation board for canal foundation soil in a salty-cold area and a method for thermal insulation and anti-seepage and anti-frost heave. The concrete slab, the phase-change thermal insulation and anti-seepage board is connected with the backstop capillary, the concrete slab is set on the phase-change thermal insulation and anti-seepage board, the phase-change thermal insulation and anti-seepage board is arranged with multiple lattices, and the four side walls of the lattice are provided with communicating holes. The four sides of the phase-change thermal insulation and anti-seepage board are provided with long baffles, and the prepared saline solution is injected into the phase-change thermal insulation and anti-seepage board from the liquid injection port, and flows between the lattices through the communicating holes to form a phase-change layer. One end of the backstop capillary is inserted into the soil to absorb excess pore water in the soil, which is the filling material for the phase change layer. The phase change layer can store and release heat well under the diurnal changes of air temperature and solar radiation, and keep the soil at a positive temperature. And the local agricultural waste plastic is remolded as the material, which has flexibility and anti-seepage effect, and the poor thermal conductivity of the plastic has a good thermal insulation effect.

Description

technical field [0001] The invention relates to the field of water conservancy engineering, in particular to a method for heat preservation, anti-seepage and anti-frost heave of canal foundation soil heat preservation and anti-frost-heave phase-change heat preservation boards in salty-cold regions. Background technique [0002] In Northwest China, such as Inner Mongolia and Xinjiang, due to drought, large temperature difference between day and night, and serious evaporation, the soil in irrigation areas is prone to salinization. At the same time, the low temperature in winter causes frost heaving of canal foundation soil and serious frost damage of lining damage. The causes of freezing damage are mainly three factors: temperature, soil and moisture, among which temperature has the greatest impact, followed by moisture and soil. Most of the existing technologies mainly use structures such as closed-cell foam boards, geomembrane + insulation boards to keep the canal foundation...

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Problems solved by technology

Therefore, the effect of the canal foundation soil on mitigating frost heaving is not good, and the thermal insulation layer of the prior art is a multi-layer structure, the structure is relatively complex, and it is prone to water seepage and failure for a long time

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