CN102162239B - Soft soil foundation treated by chemical-solution-combined injection electroosmosis method and construction method of soft soil foundation - Google Patents
Soft soil foundation treated by chemical-solution-combined injection electroosmosis method and construction method of soft soil foundation Download PDFInfo
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- CN102162239B CN102162239B CN 201110083840 CN201110083840A CN102162239B CN 102162239 B CN102162239 B CN 102162239B CN 201110083840 CN201110083840 CN 201110083840 CN 201110083840 A CN201110083840 A CN 201110083840A CN 102162239 B CN102162239 B CN 102162239B
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- 239000002689 soil Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 title claims abstract description 19
- 238000002347 injection Methods 0.000 title claims abstract description 6
- 239000007924 injection Substances 0.000 title claims abstract description 6
- 238000005370 electroosmosis Methods 0.000 title abstract description 4
- 239000000243 solution Substances 0.000 claims abstract description 39
- 239000000126 substance Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 49
- 229910052802 copper Inorganic materials 0.000 claims description 45
- 239000010949 copper Substances 0.000 claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 8
- 239000004115 Sodium Silicate Substances 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 7
- 239000010985 leather Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 241000276489 Merlangius merlangus Species 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 1
- 239000001110 calcium chloride Substances 0.000 claims 1
- 229910001628 calcium chloride Inorganic materials 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000004575 stone Substances 0.000 abstract description 3
- 238000005056 compaction Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 239000004566 building material Substances 0.000 abstract 1
- 150000001768 cations Chemical class 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 abstract 1
- 239000002244 precipitate Substances 0.000 abstract 1
- 239000004576 sand Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 230000005685 electric field effect Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
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- 238000003908 quality control method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
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Abstract
The invention provides a soft soil foundation treated by chemical solution-combined injection electroosmosis method and a construction method of the soft soil foundation, and belongs to the technical field of processing of the soft soil foundation. A metal electrode is inserted into the soft soil foundation; different chemical solutions are injected into a positive electrode and a negative electrode respectively, and a direct current is fed; under a direct current field, water and a cation solution which have positive charges flow towards the negative electrode, and an ion solution with negative charges flows towards the positive electrode so as to form electroosmosis chemical reaction; at the same time, the water is pumped and discharged from the top of the negative electrode so as to reduce the water ratio in the soil, accelerate concretion and compaction of the soil, and enhance the strength of the soil; and precipitates produced by the chemical reaction can cement the soil particles. Compared with other soft soil foundation treatment methods, the construction method has the advantages of more environment friendliness, lower energy consumption and saved treatment cost, and large-size mechanical equipment and building materials such as cements, sand, stones and the like are not required. By the method, the construction process is simple, the operability is high, the quality is convenient to control and detect, and the intensity of the soil is enhanced obviously.
Description
Technical field
The present invention relates to a kind of soft soil foundation processing technology field, relate in particular to a kind of associating chemical solution and inject electroosmotic drainage soft soil foundation and job practices thereof.Mainly be adapted to the field of engineering technology such as reclamation by pumping filling treatment of soft foundation such as coastal tidal, depression.
Background technology
Along with the fast development of national economy and infrastructure construction, reclaiming fields from the sea is to alleviate at present one of coastal cities land resources effective way in short supply.The land reclamation method is that waterway dredging and land-based area form the good method of killing two birds with one stone, and is also present China main method that land-based area forms of reclaiming fields from the sea.Due to regional difference, barged-in fill character is had nothing in common with each other, but general moisture content is higher, reach the required disposal cost of engineering construction relatively high.For grounds such as blowing-filling sludge matter soil, sandy soils, several reinforcing technique methods commonly used have at present: deep-mixed pile, vacuum/preloading, plastic plate/broken stone pile draining associating dynamic compaction etc.Different reinforcement means has characteristics and available field separately, but all needs relatively large-scale plant equipment or expend a large amount of constructional materialss.Electroosmotic drainage is insert metal electrode and pass to direct current in ground, and under the DC electric field effect, water in soil will flow to negative electrode from anode and form electric osmose; Do not allow water replenish and draw water from the well point of negative electrode at anode, groundwater table is reduced, in soil, moisture content reduces, and improves soil body effective stress.This method need not the constructional materialss such as cement, sandstone, to environment no dust pollution, noiselessness, and need not heavy construction machinery in construction; But common electroosmotic drainage treatment cycle is relatively long and the rear intensity of processing improves limited.
Before the present invention, Chinese patent " testing device for reinforcing soft soil model by electrochemical piling method " (ZL 200710052637.5) discloses a kind of model test apparatus that utilizes electroosmotic drainage to improve weak soil intensity; Continuous and considering to have done in the improvement of overlying burden model test apparatus, electrode and arrangement form improvement a little work (as Chinese patent application number: 200910272435.0,200910272536.8 and 200910272537.2).This model test apparatus can effectively be simulated electroosmotic drainage pile mechanism, but little guide indoor model test device equipment and application of results still have a segment distance to practical engineering application; Common electroosmotic drainage can be processed soft soil foundation effectively, but treatment cycle is often relatively long.Chinese patent " a kind of reinforcement means of soft foundation " (ZL 200810018498.9) discloses a kind of being applicable to take ultra-fine grain as main and the stream mud that the coefficient of consolidation is minimum, the reinforcing soft foundation combined method of roadbed of alluvial silt: at first utilize the self-load combined precompressed of low-position vacuum that the place weak soil is once reinforced; Secondly the vacuum preloading electroosmotic drainage is to place weak soil second consolidation; Then utilize vacuum electroosmosis precipitation that the mudding layer is reinforced; Last vibroroller cmpacting leveling place.Although this method comprehensive treatment effect is desirable, multiple treatment technology, consolidation process Combination application repeatedly, complex process and long in time limit.Chinese patent " pre-reinforcement processing method and the device thereof of mixed hydraulically-filled soft soil foundation " (ZL 200910061919.0) discloses a kind of pre-reinforcement processing method and device thereof of mixed hydraulically-filled soft soil foundation, level is set to drainage channel in mixed hydraulically-filled process, and in conjunction with adopting the construction of vacuum pre-pressed joint electroosmotic drainage, in the hydraulic reclamation process and the hydraulic reclamation initial stage namely to ultra-soft fixed the intervention and pretreatment of soil.This method mainly is applied as pretreatment, and the bearing capacity of foundation soil after processing is still relatively low, during engineering construction, also needs to carry out after-treatment.
Summary of the invention
Expend the constructional materials amount when the objective of the invention is for soft soil foundations such as existing deep-mixed piles large, processing cost is high; Common electroosmotic drainage treatment cycle relatively long and process after intensity improve the problems such as limited, a kind of method of uniting chemical solution injection electroosmotic drainage soft soil foundation is proposed.The present invention not only has advantages of common electroosmotic drainage, and can significantly improve infiltration rate, reduction of erection time, improves and processes rear soil strength.
Technical scheme of the present invention is:
Insert metal electrode and inject respectively different chemical solutions in soft soil foundation in the positive and negative electrode, then pass to direct current, under the DC electric field effect, positively charged water and cationic solution are to cathode flow, electronegative solion anode flows, and forms electric osmose and chemical reaction; From the cathode top water-pumping/draining, reduce moisture content in soil simultaneously, accelerate the foundation soil consolidation, improve soil strength; The sediment that chemical reaction produces plays certain cementation to soil body particle.
Metal electrode of the present invention is multi-hole copper tube (perhaps steel pipe), its external diameter is between 40-60 mm, wall thickness is between 2-5 mm, copper pipe bottom four sides symmetrically and evenly distribute spacing between 40-60 mm, the aperture of aperture between 5-10 mm, copper pipe top adopts coatings to protect (avoid the factor such as heavy rain to cause water level to rise and electrode is communicated with cause short circuit), and draining/steam vent is set; The copper pipe lower end connects the tapered steel boots, and the insulation leather sheath is added a cover in the copper pipe upper end.The positive and negative electrode adopts identical copper pipe convenient construction and electrode counter-rotating; The arrangement pitch of metal electrode is between 2-6 m, and the mutual arranged crosswise of positive and negative electrode.The active length of electrode determines according to the processing depth requirements of weak soil, and insulating segment length determines according to the situation of on-the-spot upper soil horizon thickness and groundwater table, in order to facilitate draining and connecting cable, and the electrode 0.4 m left and right of generally basseting.
The present invention adopts direct current to form soil body electric field, determines operating voltage and electric current according to the difference of on-the-spot soil nature, moisture content, and general voltage is between 80-120 V, and electric current is between 60-200 A.
The chemical solution of the acceleration electric osmose speed that the present invention adopts is calcium chloride solution (CaCl
2) and sodium silicate solution (Na
2SiO
3), adding the chemical solution in the positive electrode copper pipe is calcium chloride solution, adds that on-the-spot solution concentration is 7-15 % after copper pipe; Adding the chemical solution in the negative electrode copper pipe is sodium silicate solution, adds that on-the-spot solution concentration is 15-30 % after copper pipe.Under the effect of DC electric field power, shown in the following formula of the chemical reaction of generation.
The job practices of technical solution of the present invention, its major technique step is:
(1) levelling of the land, and set up fence and warning sign at the process range periphery, make metal electrode---copper pipe;
(2) measure unwrapping wire, and will be in place in the position of appointment with the copper pipe of tapered steel boots, guarantee that crane gear is steady, leading truck drift angle perpendicular to the ground is not more than 1.5 %;
(3) utilize stake machine hydraulic pressure to sink to copper pipe, guarantees actually to sink to the copper pipe center with the design attitude deviation is not more than 50 mm, and reach respective depth bury thermometer underground near typical adjacent two copper pipes;
(4) the stake machine is withdrawn the place, near side soil body surface drainage trenching copper pipe;
(5) face south, inject respectively calcium chloride solution and sodium silicate solution in the negative electrode copper pipe by the top, make in positive and negative electrode copper pipe on-the-spot solution concentration reach respectively 10 % and 20 % left and right;
(6) utilize cable to connect each positive and negative electrode, and be connected with dc power supply respectively, ammeter of middle series connection puts the insulation leather sheath in electrode tip;
(7) pass to direct current and unite the construction of chemical solution injection electroosmotic drainage;
(8) when the negative electrode copper pipe drain hole outflow water yield obviously reduces before and goes to zero, counter-rotating yin, yang electrode, and continue energising and permeate;
(9) along with the continuing of conduction time, whether near the anode copper pipe, the phenomenons such as whiting, cracking will appear in the peripheral soil body, verify the negative electrode copper pipe outflow water yield this moment and go to zero, and whether near the temperature reading of anode copper pipe reaches 100
oThe C left and right, if, stop combined soln and inject the electroosmotic drainage construction, complete the treatment of soft foundation process; Perhaps also can determine time of stopping constructing according to the bearing capacity of foundation soil processing requirements.
Advantage of the present invention is with effect: compare with other soft-soil foundation treatment methods, processing cost is saved in the present invention's environmental protection more, low energy consumption, need not to use heavy mechanical equipment and the constructional materialss such as cement, sandstone; Compare with conventional electroosmotic drainage, the present invention has strengthened the electrical conductivity of the soil body, has improved infiltration rate, has shortened electric osmose processing time and construction period, and can strengthen soil strength by the sediment that chemical reaction produces.In addition, calcium chloride solution, sodium silicate solution and the salt and the sediment that occur to generate after chemical reaction do not pollute environment, and the prices of raw and semifnished materials are cheap.The associating chemical solution injects the method for electroosmotic drainage soft soil foundation, and its construction technology is simple, workable, is convenient to quality control, detection, improves soil strength remarkable.
Description of drawings
Fig. 1 is electrode structure of the present invention and arranges schematic diagram.
Fig. 2 is Construction Arrangement floor map of the present invention.
In figure: 1 is copper pipe (perhaps steel pipe), and 2 is the tapered steel boots, and 3 is aperture on copper pipe, and 4 are draining/steam vent, 5 is coatings, and 6 are the insulation leather sheath, and 7 is the gutter, and 8 is thermometer, 9 is ammeter, and 10 is dc source, and 11 is cable, and 12 is fence and warning sign.
The specific embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.Protection scope of the present invention is not limited only to the description of present embodiment.
As depicted in figs. 1 and 2, the copper pipe 1 bottom four sides aperture 3 that distributing symmetrically and evenly, top scribbles coatings 5 and draining/steam vent 4 is set, and its lower end connects tapered steel boots 2, upper end connecting cable 11 and insulation leather sheath 6.
During enforcement, first smooth location, and set up fence and warning sign 12 at the process range periphery; Measure unwrapping wire, and will be in place in the position of appointment with the copper pipe 1 of tapered steel boots 2, guarantee that crane gear is steady, leading truck drift angle perpendicular to the ground is not more than 1.5 %; Utilize stake machine hydraulic pressure to sink to copper pipe 1, guarantees actually to sink to copper pipe 1 center with the design attitude deviation is not more than 50 mm, and reach respective depth bury thermometer 9 underground near typical adjacent two copper pipes 1; The stake machine is withdrawn the place, near a side soil body surface drainage trenching 7 copper pipe 1; By the top face south, interior calcium chloride solution and the sodium silicate solution of adding respectively of negative electrode copper pipe 1, make the interior on-the-spot solution concentration of positive and negative electrode copper pipe 1 reach respectively 10 % and 20% left and right; Utilize cable 11 to connect each positive and negative electrode copper pipes 1, and is connected with dc power supply 10 respectively, ammeter 9 of middle series connection puts in copper pipe 1 upper end the leather sheath 6 that insulate; Pass to 80-120 V DC voltage and unite the construction of chemical solution injection electroosmotic drainage; When the negative electrode copper pipe drain hole 4 outflow water yields obviously reduce before and go to zero, counter-rotating yin, yang electrode, and continue energising and permeate; Whether along with continuing of conduction time, near anode copper pipe 1, the phenomenons such as whiting, cracking will appear in the peripheral soil body, verify the negative electrode copper pipe drain hole 4 outflow water yields this moment and go to zero, and near anode copper pipe 1, whether thermometer 8 readings reach 100
oThe C left and right, if, stop combined soln and inject the electroosmotic drainage construction, complete the treatment of soft foundation process; Perhaps also can determine time of stopping constructing according to the bearing capacity of foundation soil processing requirements.
Claims (2)
1. the associating chemical solution injects the electroosmotic drainage soft soil foundation, it is characterized in that: insert the porous metals electrode tube and also inject respectively calcium chloride and the silicate of soda chemical solution of corresponding concentration in soft soil foundation in the positive and negative electrode, chemical solution injects, draining is all completed at the porous metals electrode tube; Then pass to direct current, in the soil body, water and chemical solution form electric osmose and chemical reaction; The counter-rotating electrode, the yin, yang electrode alternately presents mutually, from the cathode top water-pumping/draining.
2. associating chemical solution according to claim 1 injects the electroosmotic drainage soft soil foundation, it is characterized in that: adding the chemical solution in positive electrode is calcium chloride solution, and adding rear on-the-spot solution concentration is 7-15 %; Adding the chemical solution in negative electrode is sodium silicate solution, and adding rear on-the-spot solution concentration is 15-30 %.
3. associating chemical solution according to claim 1 and 2 injects the electroosmotic drainage soft soil foundation, and it is characterized in that: described metal electrode is multi-hole copper tube or steel pipe, the mutual arranged crosswise of positive and negative electrode, and arrangement pitch is between 2-6 m.
4. job practices of injecting the electroosmotic drainage soft soil foundation based on associating chemical solution claimed in claim 1 is characterized in that adopting following steps:
(1) levelling of the land, and set up fence and warning sign at the process range periphery, make metal electrode---copper pipe;
(2) measure unwrapping wire, and will be in place in the position of appointment with the copper pipe of tapered steel boots, guarantee that crane gear is steady, leading truck drift angle perpendicular to the ground is not more than 1.5 %;
(3) utilize stake machine hydraulic pressure to sink to copper pipe, guarantees actually to sink to the copper pipe center with the design attitude deviation is not more than 50 mm, and reach respective depth bury thermometer underground near typical adjacent two copper pipes;
(4) the stake machine is withdrawn the place, near side soil body surface drainage trenching copper pipe;
(5) face south, inject respectively calcium chloride solution and sodium silicate solution in the negative electrode copper pipe by the top, make in positive and negative electrode copper pipe on-the-spot solution concentration reach respectively 10 % and 20 % left and right;
(6) utilize cable to connect each positive and negative electrode, and be connected with dc power supply respectively, ammeter of middle series connection puts the insulation leather sheath in electrode tip;
(7) pass to direct current and unite the construction of chemical solution injection electroosmotic drainage;
(8) when the negative electrode copper pipe drain hole outflow water yield obviously reduces before and goes to zero, counter-rotating yin, yang electrode, and continue energising and permeate;
(9) along with the continuing of conduction time, whether near the anode copper pipe, the phenomenons such as whiting, cracking will appear in the peripheral soil body, verify the negative electrode copper pipe outflow water yield this moment and go to zero, and whether near the temperature reading of anode copper pipe reaches 100
oThe C left and right, if, stop combined soln and inject the electroosmotic drainage construction, complete the treatment of soft foundation process; Perhaps also can determine time of stopping constructing according to the bearing capacity of foundation soil processing requirements.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110083840 CN102162239B (en) | 2011-04-02 | 2011-04-02 | Soft soil foundation treated by chemical-solution-combined injection electroosmosis method and construction method of soft soil foundation |
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|---|---|---|---|
| CN 201110083840 CN102162239B (en) | 2011-04-02 | 2011-04-02 | Soft soil foundation treated by chemical-solution-combined injection electroosmosis method and construction method of soft soil foundation |
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| CN102162239A CN102162239A (en) | 2011-08-24 |
| CN102162239B true CN102162239B (en) | 2013-05-15 |
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| TW200632190A (en) * | 2005-03-11 | 2006-09-16 | Univ Nat Taiwan Science Tech | Construction method for ground modification by electroosmosis |
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