Construction waste improved expansive soil roadbed structure and construction method thereof

Abstract

The invention relates to a construction waste improved expansive soil roadbed structure and a construction method thereof. The bottommost layer of the structure is a gravel soil cushion layer, construction waste improved soil filler is arranged above the gravel soil cushion layer, edge covering clay is arranged on the two sides of the construction waste improved soil filler, and anti-seepage geotechnical cloth is arranged above the construction waste improved soil filler and the edge covering clay to serve as a top sealing layer. According to the physical improvement method for doping the construction waste into the expansive soil, on one hand, the expansive soil roadbed expansibility can be reduced, and on the other hand, the roadbed strength and water permeability can be improved, so that the moisture content distribution in the roadbed is more balanced, the engineering discard is reduced, the land is saved, the engineering cost is reduced, and the environmental protection is facilitated.

Description

technical field [0001] The invention relates to the technical field of roadbed construction, in particular to an expansive soil roadbed structure improved by construction waste and a construction method thereof. Background technique [0002] Expansive soil has the characteristics of poor permeability, water absorption swelling, dehydration shrinkage, multiple cracks, and wetting, which have a significant impact on the stability of expansive soil embankment and road cutting. The surface of the subgrade filled with expansive soil is prone to dehydration shrinkage and cracking, and once re-immersed, the dehydration shrinkage will further increase the crack width, which is not conducive to the formation of subgrade integrity and strength, and reduces the stability of the subgrade and supporting structures. Therefore, in the absence of targeted treatment measures, the expansive soil excavated for subgrade construction is generally discarded, and a large number of abandoned square...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a construction waste improved expansive soil subgrade structure and its construction method. This structure composed of gravel soil cushion, edge-wrapped clay layer and anti-seepage geotextile can not only solve the problem of construction waste improved expansive soil The stability and uneven settlement of the subgrade can also be rationally utilized with expansive soil and construction waste to achieve structural stability, economical and environmental protection

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