Method for building artificial ecological island through river and lake silt

Abstract

The invention belongs to the technical field of environmental geotechnics and discloses a method for building an artificial ecological island through river and lake silt. The method for building the artificial ecological island through the river and lake silt includes the steps that cofferdam steel plates are arranged along the design boundary line of the artificial ecological island; river and lake desilting is carried out, and the river and lake silt is obtained; large-particle solid materials such as gravel in the river and lake silt are screened out, and mixed slurry is formed by adding modifying agents into screened slurry; modified mud cakes are formed by dehydrating the mixed slurry; a gravel layer is formed by backfilling a cofferdam with the large-particle solid materials such as the gravel in a paving mode, and water in the cofferdam is discharged; a gravel cushion layer is formed by conducting in-situ solidification treatment on the gravel layer in the cofferdam; the modified mud cakes are piled on the solidified gravel cushion layer in a filling mode; and revetment bricks are used for building a slope in the position, above the gravel cushion layer, of an island body. The filling method for the artificial ecological island has small pollution to the river and lake environment, high adaptability, erosion resistance and high structural reliability.

Description

technical field

[0001] The invention relates to the technical field of environmental geotechnical engineering, in particular to a method for constructing an artificial ecological island using river and lake silt. Background technique

[0002] In order to improve the water quality of rivers and lakes, ensure the normal flood discharge capacity of rivers and the smooth flow of inland waterways, large-scale dredging and dredging projects are carried out every year in our country, resulting in a large amount of dredging silt. Dredged silt has the engineering characteristics of high water content, high compressibility, low strength, and low permeability, and some of the silt also contains pollutants such as heavy metals, so it is difficult to be directly used as engineering materials.

[0003] Sludge modification is an effective way of resource utilization, that is, by adding modified materials to the sludge to change the shape, size and physical and mechanical properties of the ...