CN102487618B - Method for improving soil structure of coastal dredge fill - Google Patents
Method for improving soil structure of coastal dredge fill Download PDFInfo
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- CN102487618B CN102487618B CN 201110395961 CN201110395961A CN102487618B CN 102487618 B CN102487618 B CN 102487618B CN 201110395961 CN201110395961 CN 201110395961 CN 201110395961 A CN201110395961 A CN 201110395961A CN 102487618 B CN102487618 B CN 102487618B
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Abstract
The invention relates to a method for improving a soil structure of coastal dredge fill, which comprises the following steps of adding water into polyacrylamide for regulating to obtain polyacrylamide solution with concentration of 0.5-2.0g/L and irrigating with water amount of 100-350L/m2. Preferably, the polyacrylamide is negative ion type polyacrylamide with molecular weight between eight million to twelve million. By regulating moisture content of surface soil and concentration index of the polyacrylamide solution, the self viscidity structure of the dredge fill is rapidly improved in a layer-by-layer penetrating mode, the stable aggregate soil structure is established, permeability and water conductivity of the dredge fill can be remarkably improved, and water, fertilizer and salt transportation channels of the dredge fill are established.
Description
Technical field
The present invention relates to a kind of improvement method of soil structure, particularly a kind of improvement method for strand barged-in fill soil structure.
Background technology
The strand barged-in fill is the warp that utilizes offshore dredging seabed mud out to form by the waterpower hydraulic reclamation.Owing to not having soil-forming process to occur, and be subject to for a long time the impact of Seawater immersion, it is high that soil has salt content, the soda voltinism is strong, particle thin (take and stick grain as main), and quality is sticky heavy, structural poor, relative density and unit weight are larger, and the feature that porosity and osmotic coefficient are little and natural desalination processes is very very long has seriously restricted the construction of reclaimed land city, strand and ecotope.Soil structure improved addictive is prerequisite and the fundamental way that realizes strand barged-in fill quick desalination row's alkali and set up the good water of barged-in fill, fertilizer, salt migration pathway.Existing barged-in fill structural improvement is with additives, as machine fertilizer, turfy soil, river sand, mix to change in proportion the physical arrangement of soil with barged-in fill, because barged-in fill is structural poor, sticky heavy, mix the process complexity, quantities is large, cost is high, and mix rear soil property skewness, later stage Leaching and desalinization process easily forms predominant current, causes water resource waste.
Summary of the invention
The present invention be directed to the deficiency of existing strand barged-in fill structural improvement method, in conjunction with deposition characteristics and the soil characteristic of barged-in fill, provide a kind of homogeneous, successively improve the improvement method of the sticky weight structure of strand barged-in fill.
The technical solution used in the present invention is:
The polyacrylamide solution that to the invention provides a kind of concentration be 0.5-2.0g/L is for improving the purposes of the sticky weight structure of strand barged-in fill.
Especially the molecular weight that concentration is 0.5-2.0g/L glues the purposes of weight structure between the aqueous solution of the anion-polyacrylamide of 800-1200 ten thousand for improving the strand barged-in fill.
The present invention also provides the improvement method of a kind of strand barged-in fill, comprises the steps: that polyacrylamide is added to water is adjusted to the polyacrylamide solution that concentration is 0.5-2.0g/L, irrigates irrigation volume 100-350L/m
2.Preferably, described polyacrylamide is the anion-polyacrylamide solid of molecular weight between 800-1200 ten thousand.
Particularly, the improvement method of a kind of strand barged-in fill, comprise the steps:
(1), hydraulic reclamation district, monitor on field strand to be improved shows native moisture content, when the native moisture content of table, lower than 20% the time, stops monitoring;
(2), polyacrylamide is added to water is adjusted to the polyacrylamide solution that concentration is 1.3-2.0g/L, irrigation, irrigation volume 100-150L/m
2;
(3), standing, monitoring form soil moisture content, reach 15% when following until show native moisture content, stops monitoring;
(4), polyacrylamide is added to water is adjusted to the polyacrylamide solution that concentration is 0.8-1.2g/L, irrigation, irrigation volume 200-250L/m
2;
(5), standing, monitoring form soil moisture content, reach 15% when following until show native moisture content, stops monitoring;
(6), polyacrylamide is added to water is adjusted to the polyacrylamide solution that concentration is 0.5-1.0g/L, irrigation, irrigation volume 280-350L/m
2.
In above-mentioned improvement method, monitoring described in step (1), (3) and (5) is that the mode that gathers soil sample by regular earth boring auger records;
In above-mentioned improvement method, the soil quality moisture content that the native moisture content of table described in step (1), (3) and (5) is the 40cm topsoil.
Preferably, in above-mentioned improvement method, polyacrylamide described in step (2), (4) and (6) is the anion-polyacrylamide solid of molecular weight between 800-1200 ten thousand.
Preferably, in above-mentioned improvement method, described in step (2), irrigate as sprinkling irrigation or flood irrigation; Described in step (4) and (6), irrigate as flood irrigation.
Beneficial effect of the present invention is:
1) with existing barged-in fill structural improvement technology, compare, reagent dosage of the present invention is few, and the preparation and application simple and fast is workable; Nonhazardous, with low cost, there is considerable economy, environmental benefit.
2) the present invention shows native moisture content and concentration of polyacrylamide solution index by regulation and control, successively deeply, the cement structure of quick improvement barged-in fill self, set up stable granular soil structure, permeability and the transmissibility of barged-in fill be can significantly promote, good barged-in fill water, fertilizer, salt migration pathway set up.
3) mode of using the irrigation of employing waterpower of polyacrylamide of the present invention, after improvement, soil property is evenly distributed, and the improvement degree of depth is darker, can reach below 1m.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention, but do not limit protection scope of the present invention.
The present invention is the effective ways of a kind of quick improvement strand barged-in fill cement structure, be by regulation and control show that native moisture content changes and PAMA solution concentration difference by the downward granular structure of successively setting up barged-in fill of table.
Embodiment 1
Harbor work's industry district, south, Tianjin is positioned at the southeast, Binhai New Area in Tianjin, the neighbour Bohai Sea, and in district, land-based area is mainly and encloses extra large land reclamation formation.Near the improvement of the barged-in fill original soil of Case Experiments On A Nan Di road, Nan Gang industrial area is carried out in demonstration area, in district 1m soil body salt content in the 18-22g/kg scope, 8.0<pH<8.5.The periodic sampling soil sample is measured soil moisture content, and when 40cm shows native moisture content and is 18.82%, the anion-polyacrylamide that is 1,000 ten thousand by molecular weight adds the polyacrylamide solution that water is configured to 1.6g/L, sprinkling irrigation, irrigation volume 120L/m
2; Standing, when the native moisture content of table reaches 14.15%, polyacrylamide is added water move to the polyacrylamide solution that concentration is 0.9g/L, flood irrigation, irrigation volume is 210L/m
2; Standing, when the native moisture content of table reaches 13.78%, polyacrylamide is added water move to the polyacrylamide solution that concentration is 0.7g/L, flood irrigation, irrigation volume is 300L/m
2, improvement finishes.
In improvement Qian， district, soil was determined the lasting drip washing of head after 1 month, soil hydraulic conductivity still<0.35mmh
-1; After improvement, identical head drip washing is after 2 days, and soil hydraulic conductivity can reach 8.23mmh
-1.
After improvement finishes, fresh water drip washing, after 7 days, 40cm shows native salt rejection rate and reaches 36% up to 69%, 1m soil body salt rejection rate; After 12 days, 60cm shows native salt content and will reach below 3.0g/kg, and pH<8.3 meet the growth demand of garden plants.
The above, be only preferred embodiment of the present invention, not technical scheme of the present invention done to any pro forma restriction.Any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong in the scope of technical scheme of the present invention.
Claims (3)
1. the improvement method of a strand barged-in fill, is characterized in that: comprise the steps:
(1), hydraulic reclamation district, monitor on field strand to be improved shows native moisture content, when the native moisture content of table, lower than 20% the time, stops monitoring;
(2), polyacrylamide is added to water is adjusted to the polyacrylamide solution that concentration is 1.3-2.0 g/L, irrigation, irrigation volume 100-150 L/m
2;
(3), standing, monitoring form soil moisture content, reach 15% when following until show native moisture content, stops monitoring;
(4), polyacrylamide is added to water is adjusted to the polyacrylamide solution that concentration is 0.8-1.2 g/L, irrigation, irrigation volume 200-250 L/m
2;
(5), standing, monitoring form soil moisture content, reach 15% when following until show native moisture content, stops monitoring;
(6), polyacrylamide is added to water is adjusted to the polyacrylamide solution that concentration is 0.5-1.0 g/L, irrigation, irrigation volume 280-350 L/m
2.
2. the improvement method of a kind of strand according to claim 1 barged-in fill, it is characterized in that: described in step (2), (4) and (6), polyacrylamide is the anion-polyacrylamide of molecular weight between 800-1200 ten thousand.
3. the improvement method of a kind of strand according to claim 1 and 2 barged-in fill, is characterized in that: described in step (2), irrigate as sprinkling irrigation or flood irrigation; Described in step (4) and (6), irrigate as flood irrigation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110395961 CN102487618B (en) | 2011-12-02 | 2011-12-02 | Method for improving soil structure of coastal dredge fill |
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|---|---|---|---|
| CN 201110395961 CN102487618B (en) | 2011-12-02 | 2011-12-02 | Method for improving soil structure of coastal dredge fill |
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| CN102487618A CN102487618A (en) | 2012-06-13 |
| CN102487618B true CN102487618B (en) | 2013-12-25 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103718688A (en) * | 2014-01-22 | 2014-04-16 | 天津泰达园林建设有限公司 | Improvement method for soil structure of coastal dredger fills |
| CN107409522A (en) * | 2017-07-18 | 2017-12-01 | 天津港(集团)有限公司 | A kind of method that soil structure of coastal dredger fills is improved using mushroom bran base composite high-water-absorptivresin resin |
| CN111133979A (en) * | 2020-01-14 | 2020-05-12 | 上海市园林科学规划研究院 | Method for preparing compost by adopting seaside dredger fill |
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| CN101012379A (en) * | 2007-02-05 | 2007-08-08 | 河海大学 | Cation polyacrylamide swelled ground modifying agent |
| CN101514290B (en) * | 2009-03-27 | 2011-04-06 | 昆明理工大学 | Multifunctional soil improvement regulator and preparation method |
| CN102150489B (en) * | 2010-12-06 | 2013-01-02 | 西南大学 | Method for quickly improving water-stable aggregate of sandy soil |
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Owner name: TIANJIN TEDA GREENING GROUP CO., LTD. Free format text: FORMER NAME: TIANJIN TAIDA GARDEN CONSTRUCTION CO.,LTD. |
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Address after: Binhai Economic and Technological Development Zone, Tianjin City, 300457 Mu Ning Road No. 26 Patentee after: TIANJIN TEDA GREENING GROUP Co.,Ltd. Address before: Binhai Economic and Technological Development Zone, Tianjin City, 300457 Mu Ning Road No. 26 Patentee before: Tianjin TEDA Landscape Construction Co.,Ltd. |
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Address after: No. 26 Muning Road, Economic and Technological Development Zone, Binhai New Area, Tianjin, 300457 Patentee after: Tianjin TEDA Green Technology Group Co.,Ltd. Address before: No. 26 Muning Road, Economic and Technological Development Zone, Binhai New Area, Tianjin, 300457 Patentee before: TIANJIN TEDA GREENING GROUP Co.,Ltd. |
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Address after: No. 26 Muning Road, Economic and Technological Development Zone, Binhai New Area, Tianjin, 300457 Patentee after: Tianjin TEDA Green Technology Group Co.,Ltd. Address before: No. 26 Muning Road, Economic and Technological Development Zone, Binhai New Area, Tianjin, 300457 Patentee before: Tianjin TEDA Green Technology Group Co.,Ltd. |
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