Improvement method for soil structure of coastal dredger fills

A technology of dredging soil filling and seashore, which is applied in the fields of soil lifting machinery, application, agriculture, etc. It can solve the problems of poor soil water and fertilizer retention capacity, high cost, and uneven distribution of soil quality, so as to improve the soil water and fertilizer retention capacity and prepare Easy to use and uniform distribution of soil quality

Inactive Publication Date: 2014-04-16
TIANJIN SEASHORE SALINE ALKALI SOIL BIOLOGICAL PLANTING ENG
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AI Technical Summary

Problems solved by technology

The existing dredger fill soil structure improvement technology mainly uses exogenous additives, such as organic fertilizer, peat soil, and river sand, to physically mix with dredge fill soil in proportion to change the gradation composition of soil particles, thereby increasing the soil pore structure , due to the poor structure and tightness of the dredged fill soil, the mixing process is complex, the amount of work is large, the cost is high, and the soil quality is unevenly distributed after mixing, and the dominant flow is likely to be forme

Method used

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Embodiment Construction

[0017] The present invention is further described below in conjunction with specific examples, but the protection scope of the present invention is not limited.

[0018] The present invention is an effective method for quickly improving the clay structure of coastal dredger fill soil, which is to establish the aggregate structure of dredge fill soil layer by layer from surface to bottom by adjusting the concentration and proportion difference of calcium nitrate and anionic polyacrylamide solution. The specific improvement steps are: monitor the moisture content of the topsoil in the coastal reclamation area to be improved in the field, and stop monitoring when the moisture content of the topsoil is lower than 20%; 0.5-0.8g / L compound aqueous solution, irrigation, irrigation volume 100-150L / m 2 ; Stand still for 2-3 days, add water to adjust calcium nitrate and polyacrylamide to a composite aqueous solution with a concentration of 0.5-1.0g / L and 0.4-0.5g / L respectively, and irr...

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Abstract

The invention relates to an improvement method for a soil structure of coastal dredger fills. The method is applied to a composite water solution of calcium nitrate and polyacrylamide, wherein the concentration of the calcium nitrate is 0.1-2.0g/L and the concentration of the polyacrylamide is 0.3-0.8g/L; the polyacrylamide is an anionic polyacrylamide solid with the molecular weight of 8-12 million. Aiming at the disadvantages of an existing improvement method for the soil structure of the coastal dredger fills, and aiming at improving a self-aggregate structure of the dredger fills, the formation of large aggregate particles of the dredger fills is promoted under the common effects of the calcium nitrate and a PAM (polyacrylamide) outer source additive through the bridging of PAM-Ca<2+>-soil particle positive ion bridge, so that the capillary porosity and the total porosity of the coastal dredger fills are increased.

Description

technical field [0001] The invention relates to a method for improving soil structure, in particular to a method for improving the soil structure of coastal dredging fill. Background technique [0002] Coastal dredging is a sedimentary soil formed by dredging the seabed mud from the offshore through hydraulic dredging. Because there is no soil forming process, and it is affected by seawater immersion for a long time, the soil has high salinity, strong sodium alkalinity, fine particles (mainly clay), large water holding capacity, high content of invalid pore water, and sticky texture. The characteristics of tightness, small porosity and permeability coefficient, and extremely long natural desalination process have seriously restricted the construction of cities and ecological environments in coastal land reclamation. Soil structure improvement is the necessary prerequisite and fundamental way to realize rapid desalination and alkali discharge of coastal dredger fill and to e...

Claims

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Application Information

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IPC IPC(8): A01B77/00
Inventor 赵秀芳贺志雄李娅莉王振宇
Owner TIANJIN SEASHORE SALINE ALKALI SOIL BIOLOGICAL PLANTING ENG
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