CN103388321A - Construction method for river dike foundation anti-seepage wall - Google Patents
Construction method for river dike foundation anti-seepage wall Download PDFInfo
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- CN103388321A CN103388321A CN2013103024484A CN201310302448A CN103388321A CN 103388321 A CN103388321 A CN 103388321A CN 2013103024484 A CN2013103024484 A CN 2013103024484A CN 201310302448 A CN201310302448 A CN 201310302448A CN 103388321 A CN103388321 A CN 103388321A
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Abstract
The invention discloses a construction method for a river dike foundation anti-seepage wall. Electric geo-plastic drain boards serving as anodes and cathodes are arranged alternatively in sequence in a river dike weak foundation, a sodium silicate solution and a calcium chloride solution are filled respectively, the chemical solutions undergo chemical reactions with each other under the action of a direct-current electric field, and soil bodies among electrodes are reinforced, so that the anti-seepage coefficient is increased; and water in the foundation is drained from the cathodes, so that the weak foundation is reinforced effectively. When the requirement anti-seepage performance is high, two or three rows of combined chemical solutions are injected along an embankment direction with an electro-osmosis method to form the anti-seepage wall. According to the anti-seepage wall formed by the method, the integral anti-seepage wall is constructed at one time, and high construction efficiency, good integral anti-seepage effect of the anti-seepage wall and low construction cost are achieved. The method has the advantages of simple construction process, high operability, convenience in quality control, remarkable economic benefit and remarkable anti-seepage treatment effect.
Description
Technical field
The present invention relates to dike, dam antiseepage improvement field of engineering technology, relate in particular to a kind of job practices of river dike foundation anti-seepage wall.Mainly be applicable to dike, dam technical field of construction.
Background technology
The antiseepage problem of dykes and dams, river dike, directly affect the stability and security problem of dykes and dams or embankment.The technical method that is used at present underground prevent perpendicular seepage mainly contains: deep-mixed pile technology, High-pressure Spiral Spray Technology, multi-head small-diameter bored concrete pile technology, Diaphragm Wall, jetting are made the standby seepage control wall technology of plasticity concrete of wall legal system etc.Every kind of method has its advantage separately, but also has limitation separately.Generally speaking, working procedure is more, the duration is long, curing compound adopts single cement material, and operating expenses is more high.
Before the present invention, Chinese invention patent " a kind of coastal saline soil improvement method " (patent No.: ZL200810211389.9) disclose and a kind ofly by positive triangle arrangement, bored three row's injected holes, with grouting pump successively to injected water mud in injected hole, cement paste is penetrated in rock-soil layer, and adjacent two injected hole institute cement injections closely join the technical scheme that forms impervious wall; This method can prevent that seawater and salinity from continuing the etch soil, play the effect of impervious wall, but this method also exists that three row hole drilling construction sequences are many, slip casting effect be subjected to soil layer property affect greatly, hole between slurries whether join and can't judge and grouting pressure is difficult to the deficiencies such as control.Chinese invention patent " construction method of foundation ditch the multi-head small-diameter deep mixing and high-pressure jet combined anti-seepage wall " (patent No.: ZL201010138487.1) disclose a kind of multi-head small-diameter deep that utilizes and stirred the pile driving construction impervious wall, then at a side 30-40cm place of deeply stirring impervious wall, carried out the combination against seepage wall technology scheme of preventing seepage with high-pressure sprayed concrete wall construction; This combined method antiseepage treatment effect is good, but the two procedures construction period is long, the punishment cost is high, and the construction of follow-up preventing seepage with high-pressure sprayed concrete wall easily impacts the effect of deeply stirring impervious wall.Chinese invention patent " a kind of earth and rockfill dam PVC impermeable composite geomembrane core wall construction method " (patent No.: ZL201010578670.3) disclose and a kind of the PVC composite geo-membrane has been laid on the watertight core position, and thermal weld formation one whole domatic impervious barrier, make the technical scheme that is connected to form a whole seepage prevention system between PVC film and dam foundation impervious wall, antiseepage cover plate; This method can improve the whole anti-seepage effect of dam foundation impervious wall, but PVC composite geo-membrane itself can not apply as impervious wall separately, the overlay effect of the PVC composite geo-membrane factor such as constructed affects larger.
To sum up state, conventional impervious wall construction technique remains and deeply stirs stake and high-pressure rotary jet grouting pile at present, or increases ancillary method on the basis of conventional impervious wall.The problems such as these method ubiquity construction periods are longer, and the punishment expense is higher, and the punishment curing compound is single.Therefore, be necessary very much in conjunction with novel technical method, develop the high dykes and dams of a kind of technical feasibility, economical rationality, efficiency of construction or the job practices of river dike impervious wall.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, the associating chemical solution injects electroosmotic drainage punishment river dike bottom ground, utilize the sediment that the chemical reaction between chemical solution generates to reinforce the soil body between anodic-cathodic, improve the seepage capability of the soil body, the soil body that is reinforced between anodic-cathodic and electrode forms one impervious wall, thereby provide a kind of technical feasibility, economical rationality, construction to unite efficiently chemical solution, injects the technical method of electroosmotic drainage punishment river dike seepage control project.
Technical scheme of the present invention is:
At first squeeze into anodic-cathodic in soft soil foundation according to designing requirement, anodic-cathodic is alternately arranged successively along the embankment direction, then inject respectively different chemical solutions in anodic-cathodic, then pass to direct current, under the DC electric field effect, positively charged water and cationic solution are to cathode flow, and electronegative solion anode flows, form electric osmose and chemical reaction, and discharge the water of discharging below earth's surface outside place near negative electrode; After when the associating chemical solution injects one section of electroosmotic drainage, the on-the-spot chemical solution concentration of detecting electrode inside, and suitably add corresponding chemical solution; After associating chemical solution injection electroosmotic drainage is completed, add the chemical solution different from original chemical solution in anodic-cathodic, make it in anodic-cathodic inside, carry out chemical reaction, the barrier performance of intensifier electrode itself; The soil solidifying sedimentation is accelerated in electric drainage, and eliminating later stage soil solidifying sedimentation may be on the impact of Embankment Subsidence; The sediment that chemical reaction between different chemical solution generates, play reinforcement effect to soil structures, improves the transmission coefficient that is reinforced the soil body; When barrier performance is had relatively high expectations, along the embankment direction, 2 rows or the 3 formed impervious walls of Volleyball Association's combination solution injection electroosmotic drainage are set.
Described anodic-cathodic is, electrode width is 100-200mm, and thickness is 3-20mm, and length is determined according to the degree of depth of design impervious wall, is generally 5-20m; Be arranged alternately successively along embankment direction anodic-cathodic, spacing is 2-4m; When barrier performance is had relatively high expectations, along the embankment direction, 2 rows or 3 row's electrodes are set, the spacing between adjacent two row's electrodes is 2-4m.Employing, as anodic-cathodic, both can prevent that the associating chemical solution from injecting the electric osmose process soil body and stopping up the problem of electrode tube with flow of solution, can avoid again this etching problem in chemical solution associating electroosmotic drainage process of electrode material of negative electrode.
The chemical solution that described associating chemical solution injects electroosmotic drainage is calcium chloride solution (CaCl
2) and sodium silicate solution (Na
2SiO
3, be commonly called as water glass), adding the chemical solution in positive electrode is calcium chloride solution, adding on-the-spot solution concentration after positive electrode is 10-20%; Adding the chemical solution in negative electrode is sodium silicate solution, and adding on-the-spot solution concentration after negative electrode is 20-40%.After associating chemical solution electroosmotic drainage energising a period of time, the on-the-spot chemical solution concentration of detecting electrode inside, and suitably add corresponding chemical solution, make its on-the-spot concentration maintain a relatively stable value; The associating chemical solution adds sodium silicate solution after injecting the electroosmotic drainage end in positive electrode, add calcium chloride solution in negative electrode, thereby utilizes reacted sediment to improve the barrier performance of electrode itself.Under the effect of DC electric field power, shown in the following formula of the main chemical reactions of generation.
2H
2O-4e
-→O
2↑+4H
+ （1）
4H
2O+4e
-→2H
2↑+4OH
- （2）
Described dc source,, according to the difference of the actual conditions such as on-the-spot geological conditions and punishment length, determine operating voltage and electric current, and general voltage is between 120-220V, and electric current is between 80-200A.
The job practices of technical solution of the present invention, its major technique step is:
(1) levelling of the land, measure unwrapping wire, according to designing requirement,, in design attitude, design pitch, utilizes board-plugging device to set, and the board-plugging device position deviation that sets is not more than 20cm;
(2) start the board-plugging device static pressure equipment, will be drowned into the projected depth position at design attitude, guarantee actually to sink to electrode depth and the design attitude deviation is not more than 50cm;
(3) after having set, withdraw board-plugging device, and at disposal field scope periphery, set up fence and warning sign;
(4) the contiguous negative electrode place on earth's surface, dig shallow gutter, and will form network between gutter, and the water that makes the associating chemical solution inject electroosmotic drainage punishment discharge is discharged beyond the punishment place as early as possible; At electrode depth centre position arranging chemical solution concentration tester;
(5) add calcium chloride solution by top in positive electrode, making on-the-spot solution concentration after adding is 10-20%; To Implantation acid sodium solution in negative electrode, making on-the-spot solution concentration after adding is 20-40% by top;
(6) utilize cable the positive and negative electrode of dc source to be connected to the interface of positive and negative electrode, make the adjacent associating chemical solution that forms respectively inject positive and negative the two poles of the earth of electric osmose field;
(7) pass to direct current and unite the construction of chemical solution injection electroosmotic drainage formation impervious wall, and detection is embedded in the chemical solution concentration determination instrument at electrode middle part, when the on-the-spot solution concentration of the calcium chloride solution in positive electrode lower than 5% the time, add appropriate calcium chloride solution, lower than 10% the time, add appropriate sodium carbonate liquor when the on-the-spot solution concentration of the sodium carbonate liquor in negative electrode;
Whether (8) along with the continuing of conduction time, near anode, the phenomenons such as whiting, cracking will appear in the peripheral soil body, verify negative electrode this moment and flow out the water yield and obviously reduce and go to zero before, if stop the associating chemical solution and inject the assistance electroosmotic drainage and construct;
(9) if when barrier performance is had relatively high expectations, near the 2-4m place first row electrode arranges the second row electrode along the embankment direction, repeats above-mentioned (1)-(8) step, completes second row associating chemical solution and injects the formed impervious wall construction of electroosmotic drainage.
After when (10) completing impervious wall, fill, roller compaction construction top embankment, thereby complete the integral construction of river dike.
Advantage of the present invention and effect are: inject electroosmotic drainage through the associating chemical solution river dike bottom soft soil foundation is reinforced, significantly improve the barrier performance of the soil body between electroosmosis electrode, form one underground impervious wall; Compare with high spray cement paste Construction Anti-seepage wall technology with conventional Deep Mixing Piles Construction impervious wall, associating chemical solution of the present invention injects the formed impervious wall of electroosmotic drainage, whole impervious wall Integratively construction, not only improved efficiency of construction, and more easily guarantee the whole anti-seepage effect of impervious wall, in addition, construction cost is also relatively lower, and the prices of raw and semifnished materials such as calcium chloride solution, sodium silicate solution are cheap.The method construction technology is simple, workable, is convenient to quality control, and economic benefit is obvious, administers anti-seepage effect remarkable.
Description of drawings
Fig. 1 is the structural representation that associating chemical solution of the present invention injects electroosmotic drainage construction river dike impervious wall;
Fig. 2 is cross-sectional structure schematic diagram of the present invention;
Fig. 3 is vertical section structure schematic diagram of the present invention;
Wherein 1 is ground surface, and 2 is soft soil foundation, and 3 is embankment, and 4 is the embankment direction, 5 is waterline, and 6 is positive electrode, and 7 is negative electrode, and 8 is calcium chloride solution, 9 is sodium silicate solution, and 10 is the calcium silicates compacted soil, and 11 is permeation pathway, and 12 is chemical solution concentration determination instrument.
The specific embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing.Protection scope of the present invention is not limited only to the description of present embodiment.
As Figure 1-3, the associating chemical solution injects the technical scheme of electroosmotic drainage construction river dike impervious wall, mainly be included in the soft soil foundation 2 of ground surface below 1 and insert as electric osmose positive electrode 6 and negative electrode 7, inject respectively calcium chloride solution 8 and sodium silicate solution 9 in anodic-cathodic, utilize direct current to carry out electroosmosis, the soil body between 10 pairs of electrodes of precipitated calcium silicate thing that chemical reaction generates is reinforced, and extends permeation pathway 11, improves the whole anti-permeability performance of ground.Employing, as anodic-cathodic, both can prevent that the associating chemical solution from injecting the electric osmose process soil body and stopping up the problem of electrode tube with flow of solution, can avoid again this etching problem in chemical solution associating electroosmotic drainage process of electrode material of negative electrode.Width be 100-200mm, thickness is 3-20mm, length according to the design impervious wall the degree of depth determine, be generally 5-20m; Be arranged alternately successively along embankment direction 4 anodic-cathodics, spacing is 2-4m; When barrier performance is had relatively high expectations, along the embankment direction, two rows or three row's electrodes are set, the spacing between adjacent two row's electrodes is 2-4m.
During enforcement, as Figure 1-3, at first smooth construction plant, measure unwrapping wire at ground surface 1, according to designing requirement,, in design attitude, design pitch, utilizes board-plugging device to set, and the board-plugging device position deviation that sets is not more than 20cm; Start the board-plugging device static pressure equipment, will be drowned into the projected depth position at design attitude, guarantee actually to sink to electrode depth and the design attitude deviation is not more than 50cm; After having set, withdraw board-plugging device, and at disposal field scope periphery, set up fence and warning sign, for subsequent chemistry solution injects electroosmotic drainage, carry out safe preparation.1 contiguous negative electrode 7 places, dig shallow gutter, and will form network between gutter on earth's surface, and the water that makes the associating chemical solution inject electroosmotic drainage punishment discharge is discharged beyond the punishment place as early as possible; At electrode depth centre position arranging chemical solution concentration tester 12, this instrument can be measured the on-the-spot real-time concentration of solution in electrode automatically; Add calcium chloride solution 8 by top in positive electrode 6, making on-the-spot solution concentration after adding is 10-20%; To the interior Implantation acid sodium solution 9 of negative electrode 7, making on-the-spot solution concentration after adding is 20-40% by top; Utilize cable the positive and negative electrode of dc source to be connected to the interface of positive and negative electrode, make the adjacent associating chemical solution that forms respectively inject positive and negative the two poles of the earth of electric osmose field; Pass to direct current and unite the construction of chemical solution injection electroosmotic drainage formation impervious wall, dc source,, according to the difference of the actual conditions such as on-the-spot geological conditions and punishment length, determine operating voltage and electric current, general voltage is between 120-220V, and electric current is between 80-200A.Detection is embedded in the chemical solution concentration determination instrument 12 at electrode middle part, when the on-the-spot solution concentration of calcium chloride solution 8 in positive electrode 6 lower than 5% the time, add appropriate calcium chloride solution 8, when the on-the-spot solution concentration of sodium carbonate liquor 9 in negative electrode 7, lower than 10% the time, add appropriate sodium carbonate liquor 9; Whether along with continuing of conduction time, the phenomenons such as whiting, cracking will appear near the peripheral soil body of anode 6, verify the negative electrode 7 outflow water yields this moment and obviously reduce and go to zero before, if stop the associating chemical solution and inject the construction of assistance electroosmotic drainage; When if barrier performance is had relatively high expectations, second row electrode and the 3rd row's electrode are set along near the embankment direction 2-4m place first row electrode, repeat above-mentioned steps, complete second row and the 3rd formed impervious wall construction of Volleyball Association's combination solution injection electroosmotic drainage.After when completing impervious wall, fill, roller compaction construction top embankment 3, thereby complete the integral construction of river dike.
Claims (3)
1. the job practices of a river dike foundation anti-seepage wall is characterized in that adopting following steps:
(1) levelling of the land, measure unwrapping wire, according to designing requirement,, in design attitude, design pitch, utilizes board-plugging device to set, and the board-plugging device position deviation that sets electronic earthwork plastic drain board is not more than 20 cm;
(2) start the board-plugging device static pressure equipment, will be drowned into the projected depth position at design attitude, guarantee actually to sink to electrode depth and the design attitude deviation is not more than 50 cm;
(3) after electronic earthwork plastic drain board has set, withdraw board-plugging device, and at disposal field scope periphery, set up fence and warning sign;
(4) the contiguous negative electrode place on earth's surface, dig shallow gutter, and will form network between gutter, and the water that makes the associating chemical solution inject electroosmotic drainage punishment discharge is discharged beyond the punishment place as early as possible; At electrode depth centre position arranging chemical solution concentration tester;
(5) add calcium chloride solution by top in positive electrode, making on-the-spot solution concentration after adding is 10-20%; To Implantation acid sodium solution in negative electrode, making on-the-spot solution concentration after adding is 20-40% by top;
(6) utilize cable the positive and negative electrode of dc source to be connected to the interface of positive and negative electrode, make the adjacent associating chemical solution that forms respectively inject positive and negative the two poles of the earth of electric osmose field;
(7) pass to direct current and unite the construction of chemical solution injection electroosmotic drainage formation impervious wall, and detection is embedded in the chemical solution concentration determination instrument at electrode middle part, when the on-the-spot solution concentration of the calcium chloride solution in positive electrode lower than 5% the time, add appropriate calcium chloride solution, lower than 10% the time, add appropriate sodium carbonate liquor when the on-the-spot solution concentration of the sodium carbonate liquor in negative electrode;
Whether (8) along with the continuing of conduction time, near anode, the phenomenons such as whiting, cracking will appear in the peripheral soil body, verify negative electrode this moment and flow out the water yield and obviously reduce and go to zero before, if stop the associating chemical solution and inject the assistance electroosmotic drainage and construct;
(9) if when barrier performance is had relatively high expectations, near the 2-4 m place first row electrode arranges the second row electrode along the embankment direction, repeats above-mentioned (1)-(8) step, and complete second row associating chemical solution and inject the formed impervious wall construction of electroosmotic drainage,
After when (10) completing impervious wall, fill, roller compaction construction top embankment, thereby complete the integral construction of river dike.
2. the job practices of river dike foundation anti-seepage wall according to claim 1 is characterized in that: the chemical solution that adds the associating chemical solution to inject electroosmotic drainage is calcium chloride solution CaCl
2With sodium silicate solution Na
2SiO
3, adding the chemical solution in positive electrode is calcium chloride solution, adding on-the-spot solution concentration after positive electrode is 10-20%; Adding the chemical solution in negative electrode is sodium silicate solution, and adding on-the-spot solution concentration after negative electrode is 20-40%; After associating chemical solution electroosmotic drainage energising a period of time, the on-the-spot chemical solution concentration of detecting electrode inside, and suitably add corresponding chemical solution, make its on-the-spot concentration maintain a relatively stable value; The associating chemical solution adds sodium silicate solution after injecting the electroosmotic drainage end in positive electrode, add calcium chloride solution in negative electrode, utilizes reacted sediment to improve the barrier performance of electrode itself.
3. the job practices of river dike foundation anti-seepage wall according to claim 1 is characterized in that: the anodic-cathodic of employing is, electrode width is 100-200 mm, and thickness is 3-20 mm, and length is determined according to the degree of depth of design impervious wall, is generally 5-20 m; Be arranged alternately successively along embankment direction anodic-cathodic, spacing is 2-4 m; When barrier performance is had relatively high expectations, along the embankment direction, 2 rows or 3 row's electrodes are set, the spacing between adjacent two row's electrodes is 2-4 m.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104695442A (en) * | 2015-01-07 | 2015-06-10 | 中国石油天然气股份有限公司 | Cut-off wall construction device |
| CN104695443A (en) * | 2015-01-07 | 2015-06-10 | 中国石油天然气股份有限公司 | Cut-off wall construction technology |
| CN112482454A (en) * | 2020-11-24 | 2021-03-12 | 河海大学 | Deviation rectifying construction method for building or structure by using bionic principle |
| CN115450237A (en) * | 2022-09-20 | 2022-12-09 | 中铁二十局集团市政工程有限公司 | Construction method of clay core wall of earth-rock cofferdam |
| CN115594788A (en) * | 2022-10-13 | 2023-01-13 | 中路交科科技股份有限公司（Cn） | Grouting material for waterproofing of tunnel lining upstream face and grouting method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104695442A (en) * | 2015-01-07 | 2015-06-10 | 中国石油天然气股份有限公司 | Cut-off wall construction device |
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| CN104695443B (en) * | 2015-01-07 | 2016-08-24 | 中国石油天然气股份有限公司 | A kind of water stop construction technology |
| CN112482454A (en) * | 2020-11-24 | 2021-03-12 | 河海大学 | Deviation rectifying construction method for building or structure by using bionic principle |
| CN115450237A (en) * | 2022-09-20 | 2022-12-09 | 中铁二十局集团市政工程有限公司 | Construction method of clay core wall of earth-rock cofferdam |
| CN115450237B (en) * | 2022-09-20 | 2024-01-26 | 中铁二十局集团市政工程有限公司 | Construction method of clay core wall of earth-rock cofferdam |
| CN115594788A (en) * | 2022-10-13 | 2023-01-13 | 中路交科科技股份有限公司（Cn） | Grouting material for waterproofing of tunnel lining upstream face and grouting method thereof |
| CN115594788B (en) * | 2022-10-13 | 2024-04-19 | 中路交科科技股份有限公司 | Grouting material for waterproof of upstream surface of tunnel lining and grouting method thereof |
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Application publication date: 20131113 |