CN103374910A - Electroosmosis united air pressure separation device and technology - Google Patents
Electroosmosis united air pressure separation device and technology Download PDFInfo
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- CN103374910A CN103374910A CN2013102883993A CN201310288399A CN103374910A CN 103374910 A CN103374910 A CN 103374910A CN 2013102883993 A CN2013102883993 A CN 2013102883993A CN 201310288399 A CN201310288399 A CN 201310288399A CN 103374910 A CN103374910 A CN 103374910A
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Abstract
The invention discloses an electroosmosis united air pressure separation device and technology. In the device, an anode is connected to an externally connected air pressure source on the basis of an electroosmosis device, and fumaroles are drilled within 1/2 of the bottom of the anode; the anode serves as a gas ejector pipe; a part of a cathode which enters into a to-be-processed soft clay part is provided with drain holes, and the cathode serves as a drain pipe. The electrodes of the device are distributed in the way of parallel staggered distribution. The technology comprises the steps of: spraying gas to the flexible clay through the anode 12-30 hours after the electroosmosis is performed, controlling the air pressure within 250 kPa to 400 kPa for 10-20 min, then spraying high-pressure gas every four times. According to the invention, the beneficial effects below are achieved: 1) the drainage amount and the soil anti-shearing intensity of the electroosmosis united air pressure separation technology is increased by 10-16% than a pure electroosmosis technology when the soft clay in the same batch and with the same volume are processed for the same time, and 2) the electroosmosis united air pressure separation technology is better to be conductive to the drainage consolidation of deep soil than the pure electroosmosis technology.
Description
Technical field
The present invention relates to a kind of electric osmose associating air pressure splitting device and the technique thereof of Soft Ground.
Background technology
Electroosmotic drainage is to apply a kind of method for processing foundation that electric field accelerates discharging consolidation by the electrode in inserting the soil body.Under the effect of electric field, the water in the soil body flows to negative electrode from anode, and discharges at negative electrode.Electroosmotic drainage is because its drainage rates is irrelevant with the hydraulic permeability coefficient of soil, and relevant with its electric osmose transmission coefficient, thereby for processing the soil that the water content such as mud, barged-in fill are high, hydraulic permeability coefficient is low preferably applicability arranged, and comes into one's own in recent years.Yet, electroosmotic drainage energy consumption height, deficiency in economic performance, not good enough to deep layer soil body treatment effect, these drawbacks limit further developing of electroosmotic drainage.
The air pressure splitting refers to that Rock And Soil produces the process of crack and development under the gases at high pressure effect.As far back as the 80's of 20th century, in Environmental Engineering, just adopt air pressure splitting technology in Rock And Soil, to form the crack, increase the flow channel of fluid, improve the permeance property of the hypotonicity soil body.
Electric osmose is combined with splitting, mainly be to consider two aspects: 1. pre-stage test shows, the soil body can produce a large amount of cracks in the electric osmose process, the crack can be divided into effective fracture and harmful cracks, the crack that connects anode and cathode helps draining, is effective fracture, and electric field has been blocked in the crack of cross-section anode and cathode, be unfavorable for electric osmose, be harmful cracks.If can utilize the air pressure splitting to make the soil body directionally produce effective fracture, can effectively improve electric osmose efficient.2. utilize the splitting technology can improve treatment effect to deep soil, this is owing to can utilize the air pressure splitting that the deep layer soil body is applied confined pressure on the one hand, increases super quiet hole and presses, on the other hand, the crack that the air pressure splitting causes can be the quick dissipation of pressing in super quiet hole passage is provided, and helps draining.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of electric osmose associating air pressure splitting device and technique thereof are provided.
Electric osmose associating air pressure splitting device comprise model casing, voltage-stabilized power supply, wire, a plurality of anode, a plurality of negative electrode, anode fastening devices, external gas potential source, tracheae, gas-tpe fitting, on cover sand, pending bury, water receiving container; Anode and negative electrode are arranged in the parallel misalignment mode, the model casing upper end vertically is provided with the anode fastening devices, a plurality of anodes are fixed on the anode fastening devices, model casing bottom anode fastening devices both sides are provided with the fixing and draining screwed hole of two row's negative electrodes, the fixing draining screwed hole that reaches of negative electrode is provided with the fixing and gutter of negative electrode, the external screw thread that negative electrode is fixing and the gutter end is provided with negative electrode is fixed and the draining screwed hole matches, a plurality of negative electrodes insert the fixing and gutter of negative electrode, under-filled pending bury in the model casing, the model casing internal upper part covers sand on filling, anode enter pending bury bottom 1/2 with the interior fumarole that is provided with, each fumarole is over against a negative electrode, negative electrode enters pending bury place and is provided with drain hole, a plurality of anodes link to each other with positive pole of stabilized voltage supply by wire, a plurality of anodes pass through tracheae, gas-tpe fitting links to each other with the external gas potential source, and a plurality of negative electrodes link to each other with the voltage-stabilized power supply negative pole by wire, and a plurality of negative electrodes below is provided with the water receiving container.
Described anode, negative electrode are metal tube.The metal tube inner sleeve geotechnique filter membrane that described negative electrode adopts.
The step of electric osmose associating air pressure splitting technique is as follows:
1) the fixing and draining screwed hole of negative electrode during negative electrode is fixing and gutter screws in, a plurality of negative electrodes insert the fixing and gutter of negative electrode, utilize the anode fastening devices that a plurality of anodes are fixed on the model casing;
2) pending bury layering is filled in the model casing, compacting behind every filling one deck makes the bury of filling be in dense state, so repeatedly processes height until the interior bury height of model casing reaches design;
3) with on cover sand and be layered on equably on the pending bury;
4) with wire anode, negative electrode are connected with the both positive and negative polarity of voltage-stabilized power supply respectively, with tracheae, gas-tpe fitting anode is linked to each other with the external gas potential source;
5) open voltage-stabilized power supply, between anode and negative electrode, pass into direct current of voltage regulation with the voltage gradient of 1V/cm～2 V/cm;
6) displacement of volume of measurement in per four hours in the galvanization, and draw accumulative total displacement of volume curve map;
7) energising was opened external gas potential source inject high pressure gas in the pending bury after 12 to 30 hours, and air pressure is controlled at 200kPa～400kPa, and the duration is 10～20 minutes, then closes the external gas potential source, repeated to spray one time high pressure gas in per four hours afterwards;
8) when adding up the displacement of volume curve map near level, close voltage-stabilized power supply.
The present invention compared with prior art has beneficial effect:
1) same time is processed equal-volume with a collection of bury, and electric osmose associating air pressure splitting technology all increases by 10 ~ 16% than the shear strength of simple electroosmosis technology displacement, soil;
2) electric osmose associating air pressure splitting technology is more conducive to the discharging consolidation of deep soil than simple electroosmosis technology.
Description of drawings
Fig. 1 is electric osmose associating air pressure splitting device structural representation;
Fig. 2 is anode of the present invention, negative electrode plane of arrangement figure, and filled circles represents anode, and open circles represents negative electrode;
Fig. 3 is electric osmose-preloading test, electric osmose-preloading associating air pressure diametral compression test total displacement accumulation curve;
Among the figure, model casing 1, voltage-stabilized power supply 2, wire 3, anode 4, negative electrode 5, anode fastening devices 6, external gas potential source 7, tracheae 8, gas-tpe fitting 9, on cover sand 10, pending bury 11, water receiving container 12.
The specific embodiment
As shown in Figure 1, electric osmose associating air pressure splitting device comprise model casing 1, voltage-stabilized power supply 2, wire 3, a plurality of anode 4, a plurality of negative electrode 5, anode fastening devices 6, external gas potential source 7, tracheae 8, gas-tpe fitting 9, on cover sand 10, pending bury 11, water receiving container 12; A plurality of anodes 4 and a plurality of negative electrode 5 are arranged in the parallel misalignment mode, model casing 1 upper end vertically is provided with anode fastening devices 6, a plurality of anodes 4 are fixed on the anode fastening devices 6, model casing 1 bottom anode fastening devices 6 both sides are provided with the fixing and draining screwed hole of two row's negative electrodes, the fixing draining screwed hole that reaches of negative electrode is provided with the fixing and gutter of negative electrode, the external screw thread that negative electrode is fixing and the gutter end is provided with negative electrode is fixed and the draining screwed hole matches, a plurality of negative electrodes 5 insert the fixing and gutter of negative electrode, model casing 1 interior under-filled pending bury 11, model casing 1 internal upper part covers sand 10 on filling, anode 4 enter pending bury 11 bottoms 1/2 with interior the fumarole of being provided with, each fumarole is over against a negative electrode 5, negative electrode 5 enters pending bury 11 places and is provided with drain hole, a plurality of anodes 4 are by wire 3 and 2 anodal linking to each other of voltage-stabilized power supply, a plurality of anodes 4 are by tracheae 8, gas-tpe fitting 9 links to each other with external gas potential source 7, a plurality of negative electrodes 5 link to each other with voltage-stabilized power supply 2 negative poles by wire 3, and a plurality of negative electrodes 5 belows are provided with water receiving container 12.
Described anode 4, negative electrode 5 are metal tube.The metal tube inner sleeve geotechnique filter membrane that described negative electrode 5 adopts.
The step of electric osmose associating air pressure splitting technique is as follows:
1) negative electrode is fixing and gutter screws in the fixing and draining screwed hole of negative electrode, and a plurality of negative electrodes 5 insert the fixing and gutter of negative electrode, utilize anode fastening devices 6 that a plurality of anodes 4 are fixed on the model casing 1;
2) pending bury 11 layerings are filled in the model casing 1, compacting behind every filling one deck makes the bury of filling be in dense state, so repeatedly processes height until the interior bury height of model casing reaches design;
3) with on cover sand 10 and be layered on equably on the pending bury 11;
4) with wire 3 anode 4, negative electrode 5 are connected with the both positive and negative polarity of voltage-stabilized power supply 2 respectively, with tracheae 8, gas-tpe fitting 9 anode 4 is linked to each other with external gas potential source 7;
5) open voltage-stabilized power supply 2, between anode 4 and negative electrode 5, pass into direct current of voltage regulation with the voltage gradient of 1V/cm～2 V/cm;
6) displacement of volume of measurement in per four hours in the galvanization, and draw accumulative total displacement of volume curve map;
7) energising was opened external gas potential source 7 after 12 to 30 hours, inject high pressure gas in the pending bury 11, air pressure is controlled at 200kPa～400kPa, duration is 10～20 minutes, then closes external gas potential source 7, repeats to spray one time high pressure gas in per four hours afterwards;
8) when adding up the displacement of volume curve map near level, close voltage-stabilized power supply 2.
Embodiment:
Testing program
Used model casing is of a size of 700 * 300 * 400mm(outward flange).Electrode material adopts aluminum pipe.In the process of the test, anode is simultaneously as air jet pipe, the long 450mm of anode, and external diameter 16mm, internal diameter 10mm beats diameter 2mm aperture at bottom 50mm place and 150mm place.The long 450mm of negative electrode, external diameter 24mm, the aperture of even distribution diameter 4 mm in the internal diameter 18mm, bottom 300mm.The arrangement form of electrode adopts parallel misalignment to arrange that like electricity interpolar spacing is 200 mm, and different in nature electrode spacing is 141mm.
One group of check experiment is set, i.e. relatively electric osmose-preloading associating splitting, electric osmose-preloading both of these case.Electric osmose-preloading associating diametral compression test step is as follows:
1) negative electrode is fixing and gutter screws in the fixing and draining screwed hole of negative electrode, and a plurality of negative electrodes 5 insert the fixing and gutter of negative electrode, utilize anode fastening devices 6 that a plurality of anodes 4 are fixed on the model casing 1;
2) pending bury 11 is filled in the model casing 1 with every layer of thick layering of 5cm, compacting behind every filling one deck makes the bury of filling be in dense state, so repeatedly until the interior bury height of model casing reaches 27cm;
3) be layered on equably on the pending bury 11 covering sand 10 on the 14.7kg;
4) with wire 3 anode 4, negative electrode 5 are connected with the both positive and negative polarity of voltage-stabilized power supply 2 respectively, with tracheae 8, gas-tpe fitting 9 anode 4 is linked to each other with external gas potential source 7;
5) open voltage-stabilized power supply 2, between anode 4 and negative electrode 5, pass into the 15V direct current of voltage regulation;
6) displacement of volume of measurement in per four hours in the galvanization, and draw accumulative total displacement of volume curve map;
7) energising was opened external gas potential source 7 after 24 hours, inject high pressure gas in the pending bury 11, and air pressure is controlled at 200kPa～400kPa, and the duration is 15 minutes, then closes external gas potential source 7, repeats to spray one time high pressure gas in per four hours afterwards;
8) behind energising 96 h, accumulative total displacement of volume curve map is closed voltage-stabilized power supply 2 near level;
9) soil body of getting the diverse location place is measured water content, shear strength.
Electric osmose-preloading test procedure and electric osmose-preloading associating splitting is similar, just saves for the 7th step.
Result of the test
The front soil body of test is in stream and moulds state, and shear strength is 0.After the off-test, measure respectively near the shear strength of the soil of model casing mesexine, middle level, each negative electrode of bottom and anode, seen Table 1.As can be known: no matter be near the anode or near the negative electrode, no matter be top layer, middle level or bottom, the shear strength of soil all is higher than electric osmose-preloading test after electric osmose-preloading associating air pressure diametral compression test, the shear strength average of soil was 4.387kPa after electric osmose-preloading was processed, and the shear strength average of soil is 5.133kPa after electric osmose-preloading associating air pressure diametral compression test, improves 16.9% than the former; Compare electric osmose-preloading test, the shear strength of top layer, middle level and underearth improves respectively 16.8%, 5.1%, 34.6% after electric osmose-preloading associating air pressure diametral compression test, and this explanation electric osmose-preloading associating air pressure diametral compression test has preferably treatment effect for the deep layer soil body.
The shear strength of soil after table 1 test
After the off-test, measured respectively the water content of model casing top layer, middle level, underearth, such as table.The water content that records soil in the test of electric osmose-preloading is reduced to 46.42% from 67.57%, reduces by 21.15%, and the water content of soil is reduced to 45.13% from 68.21% in electric osmose-preloading associating air pressure diametral compression test, reduces by 23.08%.Only from the reduction situation of water content, make moderate progress, be more or less the same than electric osmose-preloading test although the air pressure diametral compression test is united in electric osmose-preloading.This mainly is because the measurement of water content is very large with the position relationship that fetches earth, and the position water content difference that difference fetches earth is very large, and the position of fetching earth is difficult to hold.Because what twice test adopted is that initial water content is basic identical with a collection of soil, and it is equal to process volume, and therefore, displacement is to estimate the air pressure splitting for the most intuitively parameter of electric osmose influential effect.
The water content of soil before and after table 2 test
Displacement of survey in per four hours in the process of the test, obtain total displacement curve as shown in Figure 3, can find out, jet front 24h, the displacement accumulation curve of two tests overlaps substantially, illustrate that the bury character that twice test adopt is consistent, volume is identical, this provides the foundation for two tests relatively.Begin from beginning jet 24h, the accumulative total displacement of electric osmose-preloading associating air pressure splitting is higher than electric osmose-preloading test always, final electric osmose-preloading associating air pressure diametral compression test total displacement 9795g, electric osmose-preloading test total displacement 8795g, electric osmose-preloading associating air pressure diametral compression test increases by 11.4% than electric osmose-preloading test total displacement.This explanation air pressure splitting has facilitation for electric drainage.
Claims (4)
1. electric osmose associating air pressure splitting device, it is characterized in that comprising model casing (1), voltage-stabilized power supply (2), wire (3), a plurality of anode (4), a plurality of negative electrode (5), anode fastening devices (6), external gas potential source (7), tracheae (8), gas-tpe fitting (9), on cover sand (10), pending bury (11), water receiving container (12); A plurality of anodes (4) and a plurality of negative electrode (5) are arranged in the parallel misalignment mode, model casing (1) upper end vertically is provided with anode fastening devices (6), a plurality of anodes (4) are fixed on the anode fastening devices (6), model casing (1) bottom anode fastening devices (6) both sides are provided with the fixing and draining screwed hole of two row's negative electrodes, the fixing draining screwed hole that reaches of negative electrode is provided with the fixing and gutter of negative electrode, the external screw thread that negative electrode is fixing and the gutter end is provided with negative electrode is fixed and the draining screwed hole matches, a plurality of negative electrodes (5) insert the fixing and gutter of negative electrode, under-filled pending bury (11) in the model casing (1), model casing (1) internal upper part covers sand (10) on filling, anode (4) enter pending bury (11) bottom 1/2 with an interior fumarole that is provided with, each fumarole is over against a negative electrode (5), negative electrode (5) enters pending bury (11) and locates to be provided with drain hole, a plurality of anodes (4) link to each other by wire (3) and voltage-stabilized power supply (2) are anodal, a plurality of anodes (4) are by tracheae (8), gas-tpe fitting (9) links to each other with external gas potential source (7), a plurality of negative electrodes (5) link to each other with voltage-stabilized power supply (2) negative pole by wire (3), and a plurality of negative electrodes (5) below is provided with water receiving container (12).
2. a kind of electric osmose associating air pressure splitting device according to claim 1 is characterized in that described anode (4), negative electrode (5) are metal tube.
3. a kind of electric osmose associating air pressure splitting device according to claim 2 is characterized in that the metal tube inner sleeve geotechnique filter membrane that described negative electrode (5) adopts.
4. the use electric osmose associating air pressure splitting technique of installing as claimed in claim 1 is characterized in that its step is as follows:
1) negative electrode is fixing and gutter screws in the fixing and draining screwed hole of negative electrode, and a plurality of negative electrodes (5) insert the fixing and gutter of negative electrode, utilize anode fastening devices (6) that a plurality of anodes (4) are fixed on the model casing (1);
2) pending bury (11) layering is filled in the model casing (1), compacting behind every filling one deck makes the bury of filling be in dense state, so repeatedly processes height until the interior bury height of model casing reaches design;
3) with on cover sand (10) and be layered on equably on the pending bury (11);
4) with wire (3) anode (4), negative electrode (5) are connected with the both positive and negative polarity of voltage-stabilized power supply (2) respectively, with tracheae (8), gas-tpe fitting (9) anode (4) is linked to each other with external gas potential source (7);
5) open voltage-stabilized power supply (2), between anode (4) and negative electrode (5), pass into direct current of voltage regulation with the voltage gradient of 1V/cm～2V/cm;
6) displacement of volume of measurement in per four hours in the galvanization, and draw accumulative total displacement of volume curve map;
7) energising was opened external gas potential source (7) after 12 to 30 hours, to the middle inject high pressure gas of pending bury (11), air pressure is controlled at 200kPa～400kPa, duration is 10～20 minutes, then closes external gas potential source (7), repeats to spray one time high pressure gas in per four hours afterwards;
8) when adding up the displacement of volume curve map near level, close voltage-stabilized power supply (2).
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| CN103866758A (en) * | 2014-02-18 | 2014-06-18 | 上海大学 | Vacuum electron-osmosis composite electrode |
| CN108612078A (en) * | 2018-05-08 | 2018-10-02 | 河海大学 | A kind of method that cathode bubble is eliminated in electro-osmosis method reinforcing flexible foundation |
| CN109339028A (en) * | 2018-10-24 | 2019-02-15 | 浙江大学宁波理工学院 | The soft clay processing unit and processing method of electric osmose joint cyclic microorganism slip casting |
| CN110219356A (en) * | 2019-05-13 | 2019-09-10 | 河海大学 | The inflation that saturation is quickly reduced in Tailings Dam, which intercepts water, subtracts infiltration system and method |
| CN111560944A (en) * | 2020-04-20 | 2020-08-21 | 浙江大学 | Method and device for 'electrode moving' electroosmosis drainage consolidation treatment based on air pressure splitting technology |
| CN111576389A (en) * | 2020-04-20 | 2020-08-25 | 浙江大学 | Bottom-to-top graded electroosmosis drainage deep and soft foundation treatment method and device based on' electrode movement |
| CN114878784A (en) * | 2022-05-18 | 2022-08-09 | 江苏科技大学 | Soft soil solidification test device and method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103866758A (en) * | 2014-02-18 | 2014-06-18 | 上海大学 | Vacuum electron-osmosis composite electrode |
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| CN108612078A (en) * | 2018-05-08 | 2018-10-02 | 河海大学 | A kind of method that cathode bubble is eliminated in electro-osmosis method reinforcing flexible foundation |
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| CN109339028B (en) * | 2018-10-24 | 2021-01-01 | 浙江大学宁波理工学院 | Soft clay treatment device and treatment method for electroosmosis combined microbial circulating grouting |
| CN110219356A (en) * | 2019-05-13 | 2019-09-10 | 河海大学 | The inflation that saturation is quickly reduced in Tailings Dam, which intercepts water, subtracts infiltration system and method |
| CN111560944A (en) * | 2020-04-20 | 2020-08-21 | 浙江大学 | Method and device for 'electrode moving' electroosmosis drainage consolidation treatment based on air pressure splitting technology |
| CN111576389A (en) * | 2020-04-20 | 2020-08-25 | 浙江大学 | Bottom-to-top graded electroosmosis drainage deep and soft foundation treatment method and device based on' electrode movement |
| CN114878784A (en) * | 2022-05-18 | 2022-08-09 | 江苏科技大学 | Soft soil solidification test device and method |
| CN114878784B (en) * | 2022-05-18 | 2023-09-22 | 江苏科技大学 | Soft soil solidification test device and method |
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