Protection method for improving salt expansion or dissolution sink of salty soil

A technology for saline soil and soil improvement, applied in soil protection, excavation, roads, etc., to achieve the effects of saving resources, preventing salt swelling and subsidence, and preventing soil erosion

Inactive Publication Date: 2010-10-06
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no effective, economical and reasonable treatment method for saline soil foundation

Method used

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  • Protection method for improving salt expansion or dissolution sink of salty soil
  • Protection method for improving salt expansion or dissolution sink of salty soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Embodiment: The improvement protection method of a certain saline soil embankment project is as follows,

[0019] ① Set up side piles according to the designed width of the subgrade, use a bulldozer to remove the 40cm thick salt cover and topsoil, level the base, sprinkle an appropriate amount of water, and roll the subgrade base under optimal water content conditions to achieve the maximum degree of compaction;

[0020] ②Fill gravel above the base with a thickness 20cm greater than the thickness of the salt cap removed, and 50cm beyond the width of the designed embankment on both sides. Roll compaction, spread asphalt on the top of the gravel layer, and lay geotextiles on top of it in turn. Geomembranes and geogrids;

[0021] ③Put the sack on the geogrid at the side pile of the fill according to the construction requirements, fill the sack with improved saline soil containing grass seeds and shrub seeds, loosely spread the improved soil on the geogrid, and loosely spre...

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Abstract

The invention relates to a protection method for improving the salt expansion or the dissolution sink of salty soil, which is characterized in that calcium carbide ash, fly ash, zeolite and salty soil are adopted, are mixed and stirred according to the volume ratio of 1:1:1:9 and are used for the filler improvement of a road embankment, broken stone and gravel are adopted as a buffer layer, bitumen, geomembranes and geotextiles are adopted as a partition layer, a geogrid reinforcement improved filler is adopted, a sack filled with greening grass seeds, shrub seeds and improved soil is adopted to press the toe of a slope, and a side slope adopts the protection of the companion planting of grass and shrub and the combination of a hanging net. The invention has the following advantages of: (1) adjusting measures to local conditions, making full use of the salty soil, saving resources, utilizing wastes, such as the fly ash and the like, and realizing the utilization of the wastes; (2) adopting a structural protection system formed by the improved salty soil and a geogrid together and solving the problems of stability and uniform settlement of a fill slope; and (3) combining the grass and the shrub, reaching the ecological requirement on one hand, solidifying a sloping surface on the other hand and preventing the water and soil loss and the salt expansion or the dissolution sink. The invention is suitable for the problem of engineering improvement of the salty soil in civil engineering and can be used for the engineering of the filling of a highway embankment, the protection of the side slope, the construction of a foundation, the improvement treatment of a foundation pit and the like.

Description

technical field [0001] The invention relates to a civil engineering design and construction method, which belongs to the field of new civil engineering technologies. Background technique [0002] Saline soil is a kind of special rock soil that contains more soluble salts, its soluble salt content is higher than 3%, and it has the characteristics of dissolution, salt swelling, corrosion and so on. This type of soil is mainly distributed in arid and semi-arid areas, inland basins, and farmland channels in China. According to the nature of the salts, it can be divided into three types: chloride salts, sulfates, and carbonates. The main engineering diseases of saline soil are strong subsidence, salt swelling and corrosion, etc., and the type and amount of salt content have a great influence on the physical and mechanical properties of the soil. Saline soil has a high bearing capacity in the natural state, generally above 250kPa, but once it meets water, it is easy to cause diss...

Claims

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Application Information

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IPC IPC(8): E01C21/00E02D3/00E02D3/12E02D3/10E02D17/20E02D17/04
Inventor 李志清付乐胡瑞林
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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