CN104674785A - Method for treating dredger fill foundation through flocculation combined with vacuum preloading - Google Patents
Method for treating dredger fill foundation through flocculation combined with vacuum preloading Download PDFInfo
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- CN104674785A CN104674785A CN201510002710.2A CN201510002710A CN104674785A CN 104674785 A CN104674785 A CN 104674785A CN 201510002710 A CN201510002710 A CN 201510002710A CN 104674785 A CN104674785 A CN 104674785A
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- flocculant
- barged
- fill
- reclaimed ground
- combined vacuum
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a method for treating a dredger fill foundation through flocculation combined with vacuum preloading. The method includes the processes of flocculation and vacuum preloading. Property of dredger fill is changed by early-stage flocculant, so that dewatering efficiency of late-stage vacuum preloading is improved. In addition, integral strength of the dredger fill foundation can be improved effectively by combining the flocculant with the dredger fill, so that integral reinforcing effect of the dredger fill foundation can be improved effectively through flocculation combined with vacuum preloading.
Description
Technical field
The present invention relates to a kind of method of the combined vacuum precompressed process reclaimed ground that flocculates, be mainly applicable to the process of reclaimed ground.Belong to geotechnical engineering field.
Background technology
Along with the riverine and coastal regional economic development of China, infrastructure land requirement day is becoming tight, reclaim land from the sea and become the effective ways of solution land used anxiety now, but through formed barged-in fill of reclaiming land from the sea, there is the features such as moisture content is high, mobility is strong, intensity is low, so how to process to these barged-in fills the needs meeting engineering construction, it is all a technical barrier all the time.Especially to the process of the barged-in fill of the southeastern coastal areas, the key technology of harbour, coastal area, traffic and urban construction has been become.
Although vacuum preloading has obtained and has generally used in the process of reclaimed ground, but because barged-in fill has the advantages that moisture content is high, particle is tiny, mobility is strong, vertical drainage plate during vacuum preloading is often caused to bend, the problems such as silting, though carried out continuous improvement and bring new ideas on Method and process, but still difficult satisfied reinforcing needs.
Flocculation is usually used in mud and sewerage treatment at present, and when flocculant adds in suspension, it can accelerate Separation of Solid and Liquid speed.Conventional flocculant has organic polymer coargulator and inorganic flocculating agent, organic flocculant comprises cationic flocculant (as EMA ammonium chloride copolymer, ethyl acrylate base trimethyl ammonium Methylsulfate copolymer etc.), Flokal B is (as Sodium Polyacrylate, kayexalate etc.) and flocculant in non-ion type (as polyvinyl methyl ethermaleic anhydride, polyethylene glycol oxide etc.); Inorganic flocculating agent comprises low-molecular inorganic flocculant (as KAL (SO4) 2, FeCL2 etc.) and inorganic polymer flocculant (mainly containing poly-aluminium class and Polyferric Sulfate class).
Barged-in fill is similar with the character of mud particle, and all with electronegative, the electrostatic repulsion between them can stop close to each other between particulate and aggregate into larger particle.After adding flocculant, there is Hydrolysis Reactions of Metal-ions and polymerization, electric double layer can be compressed by the positively charged multinuclear complex ion adsorbed, reduce zeta potential, along with adding of flocculant, the negative electrical charge of barged-in fill particle surface is constantly neutralized, the constantly reduction of intergranular repulsive energy, final intergranular electrostatic interaction is that principal and subordinate makes barged-in fill take off the raw Xu Ning precipitation of stable yields with gravitation.Such barged-in fill just can form larger particle, shortens sedimentation time, and increases the hole between particle.
The bridging action of flocculant in flocculation mechanism, also claims bridge linking effect, can promote the combination of micelle further, and so-called bridging action just refers to that colloid in solution and suspended particulate substance are built bridge by organic or inorganic macromolecule and is connected into floccule body and precipitates.Bridging has two types, a kind of is the bridging of electronegative colloidal particle and positively charged cation polymeric flocculant, another kind is the bridging between the material of band identical charges, as the bridging between electronegative colloidal particle and electronegative high polymer coagulant.The former also relates to the effect of charge neutrality, and de-steady active force is mainly due to the reason of attractive coulombic force, and effect is better than the latter.
Summary of the invention
Main purpose of the present invention is the defect overcoming above vacuum preloading early stage, integrates the advantage of flocculant in sewage and Treatment of Sludge, is introduced in reclaimed ground process, adopts the method for flocculation combined vacuum precompressed to process reclaimed ground.Namely first add character and structure that mixed flocculation agent changes barged-in fill when hydraulic reclamation, make its later stage be more suitable for adopting vacuum preloading process, and the water and soil accelerating barged-in fill is separated, and shortens sedimentation time.Band mixed flocculation agent and barged-in fill fully react and are adopting vacuum preloading process after deposited stabilizer.
Because barged-in fill particle is electronegative, electrostatic repulsion between them can stop close to each other between particulate and aggregate into larger particle, so deposition more slowly and less particle more easily produces the blocking of vertical drainage plate and mud during vacuum preloading unites phenomenon, and Hydrolysis Reactions of Metal-ions and polymerization can be there is after adding barged-in fill in mixed flocculation agent, electric double layer can be compressed by the positively charged multinuclear complex ion adsorbed, reduce zeta potential, maximum repulsive energy between barged-in fill is reduced, thus makes barged-in fill de-steady.The bridge formation in barged-in fill of mixed flocculation agent in addition and volume sweep effect in addition, and barged-in fill particle can be made more easily to be combined into larger particles, thus the silting phenomenon during can vacuum preloading being slowed down.In addition, the hole between soil particle can be made while thinner barged-in fill particle is combined into larger soil particle to become large, be equivalent to the water draining pass expanded between grogs like this, draining during being more conducive to vacuum preloading, thus reclaimed ground can be reinforced fast and effectively, prove through a large amount of tests: when adding the acrylamide of same dose respectively, when poly-aluminium and FC, add the best results of acrylamide, but cost is also higher, poly-aluminium takes second place, FC is the poorest, therefore by three according to 2: 3: 5 ratio combination can arrive treatment effect completely, in turn save cost, when addition is 4%, cross shear plate intensity can reach 49kpa, far away higher than the intensity of barged-in fill with conventional vacuum precompressed process of not passing through flocculation.
Prove through a large amount of tests, when flocculant the amount of participating in lower than 0.1% time, the effect after vacuum preloading process there is no too large difference relative to miserable flocculant, and vane-shear strength is all at about 17kpa.And the amount of participating in too high time not obvious to the growth of intensity, the vane-shear strength when mixing 3% is up to 44kpa, and when mixing 4% is 49kpa.Therefore mix dosage should control at 0.1%-3%.
Mixed flocculant and barged-in fill mixed hydraulically-filled time, the position of flocculant conveyance conduit access barged-in fill conveyance conduit should apart from hydraulic reclamation conveyance conduit exit at least more than 5m, mix fully to enable flocculant and barged-in fill, to be mixed evenly after barged-in fill hydraulic reclamation to leave standstill deposition 1-2 month after intended site, to ensure that flocculant and barged-in fill complete reaction and barged-in fill carry out vacuum preloading process again after the bulky grain flocculated and be combined under acting on is stablized.
Technical scheme of the present invention: this method relates to a kind of method of the combined vacuum precompressed process reclaimed ground that flocculates, and the method effectively can shorten barged-in fill and carry out vacuum preloading sedimentation time before treatment, the discharging consolidation effect during improving vacuum preloading.Thus better can process reclaimed ground.
The implementation step of this programme comprises following content: flocculation hydraulic reclamation operation and vacuum preloading operation.First organic cation type flocculant, inorganic polymer flocculant and low-molecular inorganic flocculant are joined reinforced preparation storehouse by 2: 3: 5 when flocculation operation is implemented, by flocculant conveyance conduit pumping pumping storehouse after stirring, barged-in fill hydraulic reclamation pipeline is delivered to through pumping storehouse, make it with barged-in fill hydraulic reclamation to intended site, after it fully reacts, carry out vacuum preloading.Needing reclaimed ground to be processed lays one deck woven cloth when vacuum preloading operation is implemented; Vertical drainage plate is positioned; Set shallow-layer and deep layer vertical drainage plate; Lay transverse drainage system; Laying geotextile; Lay diaphragm seal; Connect vaccum-pumping equipment.
When different with the duration for design strength, can the match ratio of the suitably whole organic flocculant of key, inorganic polymer flocculant and low-molecular inorganic flocculant, when the duration and requirement of strength lower be to use merely low-molecular inorganic or inorganic polymer flocculant to carry out hydraulic reclamation process to save cost.
When barged-in fill moisture content is higher, the mixed ratio of inorganic cation type flocculant should be increased, realize water and soil faster to enable barged-in fill and be separated, produce flocculation sediment, shorten sedimentation time.
Accompanying drawing explanation
Fig. 1---flocculant hydraulic reclamation flow chart of the present invention
Fig. 2---reinforced preparation storehouse of the present invention schematic diagram
Fig. 3---vacuum preloading overall schematic of the present invention
In figure: 1, reinforced preparation storehouse, 2, pumping storehouse, 3, mixed flocculant, 4, flocculant delivery pump, 5, flocculant conveyance conduit, 6, barged-in fill, 7, seawater, 8, the mixture of flocculant and barged-in fill, 9, barged-in fill conveyance conduit, 10, the interface of flocculant conveyance conduit and barged-in fill conveyance conduit, 11, agitator, 12, barged-in fill delivery pump, 13, vaccum-pumping equipment, 14, vacuum meter, 15, sealing ditch, 16, horizontal branch, 17, sealing system, 18, woven cloth, 19, vertical drainage plate, 20, in line joint, 21, supercharging appendix, 22 supercharging chimney filters, 23, supercharging equipment.
Detailed description of the invention
In the specific implementation, reinforced preparation storehouse is connected with pump by flocculant conveyance conduit, then pump is connected to pumping storehouse, by flocculant conveyance conduit, barged-in fill hydraulic reclamation pipeline is received in pumping storehouse.During enforcement, organic cation type flocculant, inorganic polymer flocculant and low-molecular inorganic flocculant are joined reinforced preparation storehouse by 2: 3: 5, by flocculant conveyance conduit pumping pumping storehouse after stirring, be delivered to barged-in fill hydraulic reclamation pipeline through pumping storehouse, make it with barged-in fill hydraulic reclamation to intended site.Needing reclaimed ground to be processed lays one deck woven cloth when vacuum preloading is implemented; Vertical drainage plate is positioned; Set vertical drainage plate; Lay transverse drainage system; Vertical drainage plate is connected to horizontal branch, by transverse drainage supervisor access transverse drainage supervisor; Laying geotextile; Lay diaphragm seal; Again by transverse drainage supervisor access vaccum-pumping equipment.
Barged-in fill, after flocculation, can be combined various vacuum preloading and process.
Claims (8)
1. to flocculate the method for combined vacuum precompressed process reclaimed ground, it is characterized in that mixed flocculation agent should in fluid form with barged-in fill together hydraulic reclamation.
2. the method for a kind of combined vacuum precompressed process reclaimed ground that flocculates according to claim 1, it is characterized in that the mixed flocculation agent that adds by acrylamide, poly-aluminium and FC in 2: 3: 5 ratio form.
3. the method for a kind of combined vacuum precompressed process reclaimed ground that flocculates according to claim 1, is characterized in that organic flocculant should select organic cation flocculating agent when preparing mixed flocculation agent.
4. the method for a kind of combined vacuum precompressed process reclaimed ground that flocculates according to claim 1, is characterized in that mixed flocculation agent should be mixed with solution or the slurry of its maximum concentration.
5. the method for a kind of combined vacuum precompressed process reclaimed ground that flocculates according to claim 1, is characterized in that to mix appropriate flocculant according to hydraulic reclamation soil's water content, should control at 0.1%-3%.
6. the method for a kind of combined vacuum precompressed process reclaimed ground that flocculates according to claim 1, it is characterized in that fully reacting at barged-in fill and flocculant and mixed flocculation agent and can vacuum preloading process be carried out after certain deposition, its natural sediment 1-2 month should be treated.
7. the method for a kind of combined vacuum precompressed process reclaimed ground that flocculates according to claim 1, is characterized in that the position of flocculant conveyance conduit access barged-in fill conveyance conduit should apart from hydraulic reclamation conveyance conduit exit at least more than 5m.
8. the method for a kind of combined vacuum precompressed process reclaimed ground that flocculates according to claim 1, is characterized in that in flocculation and can process with direct-discharging, booster-type or airtight direct-drawing type vacuum preloading through post-depositional reclaimed ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510002710.2A CN104674785A (en) | 2015-01-05 | 2015-01-05 | Method for treating dredger fill foundation through flocculation combined with vacuum preloading |
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| CN201510002710.2A CN104674785A (en) | 2015-01-05 | 2015-01-05 | Method for treating dredger fill foundation through flocculation combined with vacuum preloading |
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| CN104674785A true CN104674785A (en) | 2015-06-03 |
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| CN201510002710.2A Pending CN104674785A (en) | 2015-01-05 | 2015-01-05 | Method for treating dredger fill foundation through flocculation combined with vacuum preloading |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350585A (en) * | 2015-09-15 | 2016-02-24 | 温州大学 | Model test device and model test for injecting flocculating agent during dredger fill construction |
| CN108824419A (en) * | 2018-06-26 | 2018-11-16 | 温州大学 | The method of the vacuum pre-pressed joint biomineralization reinforcing High water cut soil body |
Citations (5)
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| CN1475633A (en) * | 2002-08-14 | 2004-02-18 | 凌小津 | Land making method using water way,harbour district dredge soil |
| CN101357817A (en) * | 2008-09-11 | 2009-02-04 | 中国科学院武汉岩土力学研究所 | Stereoscopic network drainage for accelerating water drainage consolidation velocity of hydraulic mud fill sludge |
| CN102312416A (en) * | 2011-10-13 | 2012-01-11 | 长沙理工大学 | Dredger fill sludge dewatering and solidification method |
| KR20130008967A (en) * | 2011-07-14 | 2013-01-23 | 삼흥토건주식회사 | The accelerating method of drain equipments for settling and settlement at reclaimed materials |
| CN103074884A (en) * | 2013-01-11 | 2013-05-01 | 温州大学 | Deep decompression anatonosis type vacuum preloading foundation treatment method |
-
2015
- 2015-01-05 CN CN201510002710.2A patent/CN104674785A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1475633A (en) * | 2002-08-14 | 2004-02-18 | 凌小津 | Land making method using water way,harbour district dredge soil |
| CN101357817A (en) * | 2008-09-11 | 2009-02-04 | 中国科学院武汉岩土力学研究所 | Stereoscopic network drainage for accelerating water drainage consolidation velocity of hydraulic mud fill sludge |
| KR20130008967A (en) * | 2011-07-14 | 2013-01-23 | 삼흥토건주식회사 | The accelerating method of drain equipments for settling and settlement at reclaimed materials |
| CN102312416A (en) * | 2011-10-13 | 2012-01-11 | 长沙理工大学 | Dredger fill sludge dewatering and solidification method |
| CN103074884A (en) * | 2013-01-11 | 2013-05-01 | 温州大学 | Deep decompression anatonosis type vacuum preloading foundation treatment method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350585A (en) * | 2015-09-15 | 2016-02-24 | 温州大学 | Model test device and model test for injecting flocculating agent during dredger fill construction |
| CN105350585B (en) * | 2015-09-15 | 2017-06-20 | 温州大学 | The model test apparatus and model test of flocculant are injected in barged-in fill work progress |
| CN108824419A (en) * | 2018-06-26 | 2018-11-16 | 温州大学 | The method of the vacuum pre-pressed joint biomineralization reinforcing High water cut soil body |
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Address after: 38 East Road, Ouhai Economic Development Zone, Zhejiang, Wenzhou (Wenzhou University Science Park, No. 325000) Applicant after: Wenzhou University Address before: 325035 Zhejiang province Wenzhou Chashan Higher Education Park Applicant before: Wenzhou University |
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