A construction method and structure for frost heave prevention of excavated channels in alpine regions

Abstract

The invention provides a construction method for preventing a rectangular channel in a highly cold region from frostbite swelling. The method comprises the steps of 1) paving big coarse granular materials on foundation soil at the bottom part of the channel, and paving intermediate coarse granular materials on the big coarse granular materials; 2) manufacturing a section where the bottom part of the channel is connected to a channel slope into an arc shape; paving a geotechnical cloth close to the big coarse granular materials in the direction from the connecting section to the channel top; and paving sand gravels on the geotechnical cloth; 3) arranging flow guiding type frostbite swelling bodies at intervals on the sand gravels at the connecting section along the water running direction of the channel; 4) paving small coarse granular materials on the frostbite swelling bodies and the sand gravels at the channel slope; and paving a composite geo-membrane and a polystyrene board on thesmall coarse granular materials; and 5) pouring precast concrete on the polystyrene board at the outside of the connecting section; and paving a hexagonal concrete board on the polystyrene board at the outside of the channel slope. The invention also discloses a structure for preventing a deeply-excavated rectangular channel in the highly cold region from frostbite swelling. The method and the structure have the characteristics that the frostbite swelling caused deformation is small; the ice-push preventing capacity is high; and the frostbite swelling effect is good.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, and more specifically relates to a construction method and structure for preventing frost heave of an excavation channel in an alpine region. Background technique [0002] Frost heave damage and leakage of channels are common problems in water conservancy projects in cold northern regions of my country. The channel slope protection will produce frost heaving deformation under the action of negative temperature in winter, and the temperature rise in spring will cause it to melt and cause thawing deformation. In spring, ice thrust will be generated under the action of wind and waves. . [0003] At present, some achievements have been made in anti-seepage and anti-frost technology of canals. Canal anti-frost-heave materials have changed from single materials to composite materials, canal lining forms have changed from single structures to composite structures, and canal constr...

AI Technical Summary

Problems solved by technology

[0004] The anti-seepage and anti-frost heave structure of the existing channel is single, the anti-frost heave effect is poor, and the capillary water cannot be restrained from rising. Materials such as concrete, asphalt concrete and membrane materials are used as the antifreeze and anti-seepage layer of the channel, which can achieve the purpose of preventing channel leakage, but its anti-frost heave performance is not ideal. The existing block laying simply relies on cement mortar to fill and fix However, there is still the problem of non-uniform frost heave deformation of the concrete slab, which causes damage to other concrete slabs or large-area concrete frost heave damage, and does not fundamentally solve the problem of frost heave prevention

[0005] Therefore, after several freeze-thaw cycles and freezing damage in the existing anti-frost structure of the channel in some harsh environment areas, the anti-frost heave body of the channel will be damaged by frost heave, which will affect the operation efficiency of the channel and increase the maintenance cost of the channel. Therefore, in the cold There is an urgent need for a method that can not only prevent seepage, prevent erosion, but also resist frost heaving in the construction of canals in the region.

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