CN104131549A - Electro-osmotic drainage consolidation method for electrode pipes - Google Patents
Electro-osmotic drainage consolidation method for electrode pipes Download PDFInfo
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- CN104131549A CN104131549A CN201410270062.4A CN201410270062A CN104131549A CN 104131549 A CN104131549 A CN 104131549A CN 201410270062 A CN201410270062 A CN 201410270062A CN 104131549 A CN104131549 A CN 104131549A
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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
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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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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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses an electro-osmotic drainage consolidation method for electrode pipes. The electro-osmotic drainage consolidation method includes steps of arranging electrodes; arranging pipelines; electrifying the electrodes; stopping electro-osmosis. The step of electrifying the electrodes includes alternately electrifying the electrodes in a direction change manner; continuously electrifying the electrodes; intermittently electrifying the electrodes; repeatedly continuously electrifying the electrodes and intermittently electrifying the electrodes. The electro-osmotic drainage consolidation method has the advantages that a process for connecting currents, voltages and TDR (time domain reflectometry) sensors with one another is adopted, the intensity and the directions of electric fields are timely adjusted according to electric field and soil moisture content space-time distribution conditions fed by circuits, accordingly, electro-osmotic drainage consolidation speeds and effects can be guaranteed, the direction change and intermittent time can be accurately judged as compared with the traditional method for judging the direction change and intermittent time according to experience, and the electro-osmotic drainage consolidation method is high in pertinence for complicated lands.
Description
Technical field
The present invention relates to Geotechnical Engineering field, refer to particularly a kind of fixed method of electrode tube electric drainage.
Background technology
The low hydraulic permeability fine grained of the high-moisture media such as weak soil, mud, mud, mine tailing, its discharging consolidation is very difficult.Traditional discharging consolidation method is vacuum preloading and piling prepressing, but for the fine grained medium of the low hydraulic permeability of high-moisture, traditional method speed is slow, depth of interaction is limited, also not enough to the raising of bearing capacity.
For the soft foundation of this type of medium composition, electroosmotic drainage is the very potential method of one, and electroosmotic drainage is found to have so far more than 200 year history from for the first time.Concrete grammar for to insert metal electrode and to pass to direct current in soil, and due to DC electric field effect, the water in soil flows to negative electrode from anode, then water got rid of from negative electrode, and do not allowed water supplement near anode, can get rid of gradually water in soil by electroosmosis.Tradition electroosmotic drainage step mode, although sometimes adopted electrode conversion and these two kinds of methods of intermittently power-on, determining of electrode conversion and intermittently power-on time is by rule of thumb completely; Due to soil body characteristic complexity, therefore the experience in a place be not suitable for another place, this makes traditional electric osmose step mode lack a clear and definite powered-on mode method for designing, and the efficiency of electric osmose and effect are difficult to ensure, the advantage of electric osmose cannot be given full play of.
Summary of the invention
Object of the present invention is exactly the deficiency that will solve above-mentioned background technology, provides a kind of electric drainage fixed method.
Technical scheme of the present invention is: a kind of fixed method of electrode tube electric drainage, comprises the following steps:
A. arrangement of electrodes: multiple electrodes are vertically inserted to drainage, and electrode adopts and is evenly arranged, and spacing is 0.8～1.2m; Described electrode surrounds drainage to form outermost layer, and described outermost layer electrode is all connected with power cathode; The inside second layer electrode of described outermost layer is boundary layer, and described boundary layer electrode is all connected with positive source; In boundary layer, electrode ecto-entad is alternately connected with power positive cathode successively, and in boundary layer, all anode electrodes collect, and in boundary layer, all negative electrodes collect;
B. line arrangement: the horizontal drain pipe that electrode is laid with earth's surface is communicated with, then horizontal drain pipe is connected with vacuum pump;
C. electrifying electrodes: start vacuum pump, the Free water in the discharge section soil body, after vacuum is stable, starts dc source and start electrode to switch on, and electrifying electrodes mode is:
(1) interval commutation energising: every 10～30 minutes by boundary layer in the electrode direction that connects power supply commutate, dc source adopts the powered-on mode of voltage stabilizing or current stabilization;
(2) continue energising: the data that record according to electric current, voltage sensor, selecting the direction of curtage～time graph held stationary is steady section; Steady section is continued to energising; When curtage starts when variation is greater than stationary value ± 5% electrode to turn to; Turn to rear lasting energising, until curtage variation tendency change time stop;
(3) intermittently power-on: energising is connected both positive and negative polarity electrode after stopping, the electric current in observation circuit, finishes when electric current levels off to zero time;
(4) repeating step (2) and (3);
D. under the powered-on mode of voltage stabilizing or current stabilization when curtage arrives when setting value, stop vacuum pump and have a power failure and ooze unloading.
Preferably, c step (2) if under voltage stabilizing or current stabilization state curtage change while being less than or equal to stationary value ± 5%, according to soil body resistivity～water content curve, stop after reaching setting value at TDR (utilizing electromagnetic wave time domain reflectometry to measure the device of moisture content in region) monitoring soil moisture content.
Preferably, c step (2) if in curtage change soil moisture content while being greater than stationary value ± 5% and do not reach setting value, continue to be energized to after TDR monitoring soil moisture content reaches setting value and stop.
Preferably, the potential gradient in outermost layer and boundary layer is 1.5～2.0 times of boundary layer built-in potential gradients.
Preferably, the interelectrode distance in outermost layer and boundary layer be in boundary layer interelectrode distance 2/3～1/2.
Preferably, under voltage stabilizing state, in c step (2), electric current continues to reduce, and stops energising in the time that electric current starts to increase.
Preferably, under current stabilization state, in c step (2), voltage continues to increase, and stops energising in the time that voltage starts to reduce.
Arrangement of electrodes by outermost layer electrode be connected with power cathode, boundary layer electrode is connected with positive source, electrode is inwardly alternately connected with both positive and negative polarity successively in boundary layer, utilize hydrone easily to form aquation cation, to the low direction motion of electromotive force, namely to the principle of electrode movement that connects negative pole, water outside border is spread to surrounding, water in border collects to the negative electrode in region, and gets rid of by vacuum pump.
The direction of specific soil being carried out both positive and negative polarity commutation and can be determined curtage steady section, more accurately, more has actual specific aim than traditional commutation of judgement by rule of thumb.
Adopt the judgement of TDR monitoring soil body resistivity～water content curve setting value to turn to rear conduction time, more accurately, more have actual specific aim than traditional commutation of judgement by rule of thumb.
After energising a period of time, in drainage all there is inhomogeneous variation in positive and negative electrode moisture content, pH value, CHARGE DISTRIBUTION around: current direction negative electrode after energising, and around moisture content is lower than negative electrode for anode electrode; Anode electrode is connected with electrode anode, and hydrogen ion is separated out in ambient water generation electrolysis, makes anode electrode peripheral region be acid, and negative electrode peripheral region is alkalescence; Under electric field force effect, positive and negative ion in the soil body is respectively to Presence of an interface resistance between the migration velocity difference of negative electrode and anode and the soil body and electrode, make the electric charge in the soil body occur heavily to distribute, positive and negative electric charge is accumulated respectively in the region near yin, yang the two poles of the earth.Electrode oppositely can be adjusted CHARGE DISTRIBUTION in drainage, it is distributed to equilibrium state, thereby more effectively utilize electric energy in next galvanization.
Intermittently power-on can natural adjustment region in moisture content, pH value, CHARGE DISTRIBUTION, because electric osmose tends to cause positive and negative electrode peripheral region water content difference, a period of time that stops switching on can make balancing water content in region, and now the electric current in observation circuit levels off to zero.
Under the powered-on mode of voltage stabilizing or current stabilization, in the time that curtage arrives setting value, stop electric osmose.In the time adopting voltage stabilizing powered-on mode, in the time that electric current convergence is zero, resistance is convergence infinity, has now arrived the limit of soil body draining, continues energising meaningless, stops electric osmose.Meanwhile, in the time of current stabilization powered-on mode, whole soil body resistivity raises and causes voltage to increase gradually, for constructor's security consideration is stopped to electric osmose in the time that voltage reaches 80V.
Beneficial effect of the present invention is:
(1) adopt unique arrangement of electrodes by drainage and around keep apart, having avoided peripheral region water to supplement the infiltration of drainage, having improved the fixed efficiency of electric drainage.
(2) adopt the method that connects electric current, voltage and TDR sensor, by electric field, the soil moisture content spatial and temporal distributions situation fed back in circuit, adjust intensity and the direction of electric field in good time, ensured speed and effect that electric drainage is fixed.
(3) adopt a kind of clear and definite powered-on mode method of adjustment, by electrode oppositely and intermittently power-on be combined with, than traditional commutation of judgement by rule of thumb and intermittent time have more accurate, to the stronger feature of complicated soil specific aim.
Brief description of the drawings
Fig. 1 is arrangement of electrodes schematic diagram
Fig. 2 forward energising voltage～time graph
Fig. 3 voltage～time graph of oppositely switching on
Fig. 4 soil body resistivity～plot of water cut
Fig. 5 forward electrical current～time graph
Reverse electrical current～the time graph of Fig. 6
Wherein: 1. drainage 2. outermost layer 3. boundary layers.
Detailed description of the invention
In the embodiment of the present invention, electrode and vacuum line are arranged as: plastic electrode pipe is vertically inserted in underground soil, and plastic electrode pipe upper end is connected with power line; The horizontal drain pipe that plastic electrode pipe lays with earth's surface is communicated with, then horizontal drain pipe is connected with vacuum pump.
Embodiment 1
As shown in Figure 1, drainage 1 is circular, and plastic electrode pipe adopts square to be evenly arranged.Outermost layer 2 electrodes lead to negative electricity, the logical positive electricity in boundary layer 3, outermost layer 2 and boundary layer 3 electrode spacing 0.5m, the interior electrode ecto-entad in boundary layer 3 adopts negative positive alternative expression energising successively, electrode spacing 1m in 3 regions, boundary layer, power acquisition current stabilization powered-on mode, electric current 300A.In boundary layer, 3 all anode electrodes and negative pole collect rear connection voltmeter separately.
Adopt testing arrangement Miller Soil Box to measure soil body resistivity curve plotting, as shown in Fig. 4, moisture content is set as 52%;
Electrifying electrodes: start vacuum pump, the Free water in the discharge section soil body, after vacuum is stable, starts dc source and start electrode to switch on, and electrifying electrodes mode is:
(1) interval commutation energising: every 30 minutes, interior boundary layer 3 electrode is connected to power supply direction and commutate;
(2) continue energising: the data that record according to voltage sensor, as shown in Figures 2 and 3, from voltage～time graph, forward curve held stationary is steady section; Forward is continued to energising, be greater than ± electrode turned to 5% time when forward voltage starts to change from stationary value, in figure, show that forward voltage occurs sudden change in the time of energising 12 hours, now commutates; To negative sense, energising continues energising, if according to Fig. 3, after negative sense energising, voltage continues to rise, 0.1 hour time, voltage has fluctuation, fluctuation is in ± 5% interior normal phenomenon that all belongs to, because there are serious polarization phenomena in electrode before commutation, 0.6 hour time, voltage no longer continues to rise, so should carry out electrode turned at 0.6 hour, but now TDR data show, negative sense energising 0.6 hour, near anode, soil body water content is still more than 52%, the setting value right side of Fig. 4, therefore should extend conduction time.TDR data test shows, after negative sense energising in 3 hours, is less than 52% near near soil body water content anode, and therefore now arrival curve setting value left side determines that negative sense conduction time is 3 hours;
(3) intermittently power-on: after negative sense energising stops, positive and negative electrode is connected, the electric current in observation circuit, electric current leveled off to zero after approximately 3 hours;
(4) repeating step (2) and (3);
In current stabilization situation, consider for construction safety, when voltage reaches 80V in the present embodiment, stop vacuum pump power failure and ooze unloading.In the present embodiment, electric osmose has continued approximately 16 days altogether.
Embodiment 2
As shown in Figure 1, drainage 1 is circular, plastic electrode pipe adopts square to be evenly arranged, outermost layer 2 electrodes lead to negative electricity, the logical positive electricity in boundary layer 3, outermost layer and boundary layer electrode spacing 0.75m, in area electrodes, ecto-entad adopts negative positive alternative expression energising, electrode spacing 1m in 3 regions, boundary layer successively.Power acquisition voltage stabilizing powered-on mode, voltage 80V.In boundary layer, 3 all anode electrodes and negative pole collect rear connection ammeter separately.
Adopt testing arrangement Miller Soil Box to measure soil body resistivity curve plotting, as shown in Fig. 4, moisture content is set as 52%;
Electrifying electrodes: start vacuum pump, the Free water in the discharge section soil body, after vacuum is stable, starts dc source and start electrode to switch on, and electrifying electrodes mode is:
(1) interval commutation energising: every 30 minutes, interior boundary layer 3 electrode is connected to power supply direction and commutate;
(2) continue energising: the data that record according to current sensor, as shown in Figure 5 and Figure 6, from electric current～time graph, forward curve held stationary is steady section; Forward is continued to energising, be greater than ± electrode turned to 5% time when forward current starts to change from stationary value, in figure, show that forward current occurs sudden change in the time of energising 12 hours, now commutates; To negative sense, energising continues energising, according to Fig. 6, negative sense energising after-current continuous decrease, 0.1 hour time, electric current has fluctuation, fluctuation is in ± 5% interior normal phenomenon that all belongs to, because there are serious polarization phenomena in electrode before commutation, 0.6 hour time, electric current no longer continues to decline, and should carry out electrode turn at 0.6 hour, but show according to the water content data of TDR monitoring, near anode, soil body water content is still more than 52%, and the setting value right side of Fig. 4, therefore should extend conduction time.TDR data test shows, after negative sense energising in 3 hours, is less than 52% near near soil body water content anode, therefore determines, negative sense conduction time is 3 hours.
(3) intermittently power-on: after negative sense energising stops, positive and negative electrode is connected, the electric current in observation circuit, electric current leveled off to zero after approximately 3.5 hours;
(4) repeating step (2) and (3);
(5), in voltage stabilizing situation, when electrical current is close to zero time, electric osmose stops.Now soil resistance convergence infinity, reaches the draining limit, and electric osmose has continued approximately 21 days altogether.
Claims (6)
1. the fixed method of electrode tube electric drainage, comprises the following steps:
A. arrangement of electrodes: multiple electrodes are vertically inserted to drainage (1), and electrode adopts and is evenly arranged, and spacing is 0.8～1.2m; Described electrode surrounds drainage (1) to form outermost layer (2), and described outermost layer electrode is all connected with power cathode; The inside second layer electrode of described outermost layer is boundary layer (3), and described boundary layer (3) electrode is all connected with positive source; The interior electrode ecto-entad in boundary layer (3) is alternately connected with power positive cathode successively, and in boundary layer, (3) all anode electrodes collect, and in boundary layer, (3) all negative electrodes collect;
B. line arrangement: the horizontal drain pipe that electrode is laid with earth's surface is communicated with, then horizontal drain pipe is connected with vacuum pump;
C. electrifying electrodes: start vacuum pump, the Free water in the discharge section soil body, after vacuum is stable, starts dc source and start electrode to switch on, and electrifying electrodes mode is:
(1) interval commutation energising: every 10～30 minutes by boundary layer in the electrode direction that connects power supply commutate, dc source adopts the powered-on mode of voltage stabilizing or current stabilization;
(2) continue energising: the data that record according to electric current, voltage sensor, selecting the direction of curtage～time graph held stationary is steady section; Steady section is continued to energising; When curtage starts when variation is greater than stationary value ± 5% electrode to turn to; Turn to rear lasting energising, until curtage variation tendency change time stop;
(3) intermittently power-on: energising is connected both positive and negative polarity electrode after stopping, the electric current in observation circuit, finishes when electric current levels off to zero time;
(4) repeating step (2) and (3);
D. under the powered-on mode of voltage stabilizing or current stabilization when curtage arrives when setting value, stop vacuum pump and have a power failure and ooze unloading.
2. the fixed method of electrode tube electric drainage as claimed in claim 1, it is characterized in that: c step (2) if in diverted current or voltage change trend while changing soil moisture content do not reach setting value, continue to be energized to after TDR monitoring soil moisture content reaches setting value and stop.
3. the fixed method of electrode tube electric drainage as claimed in claim 1, is characterized in that: the potential gradient in outermost layer and boundary layer is 1.5～2.0 times of boundary layer built-in potential gradients.
4. the fixed method of electrode tube electric drainage as claimed in claim 3, is characterized in that: the interelectrode distance in outermost layer and boundary layer be in boundary layer interelectrode distance 2/3～1/2.
5. the fixed method of electrode tube electric drainage as claimed in claim 1, is characterized in that: under voltage stabilizing state, in c step (2), electric current continues to reduce, and stops energising in the time that electric current starts to increase.
6. the fixed method of electrode tube electric drainage as claimed in claim 1, is characterized in that: under current stabilization state, in c step (2), voltage continues to increase, and stops energising in the time that voltage starts to reduce.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410270062.4A CN104131549B (en) | 2014-06-16 | 2014-06-16 | A kind of method of electrode tube electric drainage consolidation |
| PCT/CN2015/081464 WO2015192752A1 (en) | 2014-06-16 | 2015-06-15 | Electrode tube electroosmosis drainage consolidation method |
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| CN201410270062.4A CN104131549B (en) | 2014-06-16 | 2014-06-16 | A kind of method of electrode tube electric drainage consolidation |
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| CN104131549B CN104131549B (en) | 2016-04-13 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015192752A1 (en) * | 2014-06-16 | 2015-12-23 | 武汉河海泽地电渗科技有限公司 | Electrode tube electroosmosis drainage consolidation method |
| CN106192982A (en) * | 2016-07-11 | 2016-12-07 | 河海大学 | A kind of electric osmose soil stake based on tubulose ekg electrode processes the method for soft base |
| CN106894531A (en) * | 2016-12-23 | 2017-06-27 | 温州大学 | Light current drainage by electroosmosis ruling by law reason buildings leakage device and the method for administering leak |
| CN108181197A (en) * | 2018-01-17 | 2018-06-19 | 湖北水总水利水电建设股份有限公司 | It is a kind of for judging to become silted up, the device and method of the best Intervention Timing of sludge soil electric osmose |
| CN110293125A (en) * | 2019-04-28 | 2019-10-01 | 南通大学 | It is a kind of original position electro reclamation and reinforce ultra-soft Polluted Soil device and method |
| CN111270566A (en) * | 2020-03-24 | 2020-06-12 | 固远晨通科技发展有限公司 | Railway roadbed drainage device, repair structure and slurry-turning mud-pumping remediation method |
| CN113846656A (en) * | 2021-09-16 | 2021-12-28 | 沈阳建筑大学 | Device for reinforcing multi-layer soft rock slope of strip mine |
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| CN108560533A (en) * | 2018-02-11 | 2018-09-21 | 浙江大学 | A kind of electric osmose combined vacuum prepressing device that electrode plate is arranged up and down |
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| WO2015192752A1 (en) * | 2014-06-16 | 2015-12-23 | 武汉河海泽地电渗科技有限公司 | Electrode tube electroosmosis drainage consolidation method |
| CN106192982A (en) * | 2016-07-11 | 2016-12-07 | 河海大学 | A kind of electric osmose soil stake based on tubulose ekg electrode processes the method for soft base |
| CN106894531A (en) * | 2016-12-23 | 2017-06-27 | 温州大学 | Light current drainage by electroosmosis ruling by law reason buildings leakage device and the method for administering leak |
| CN106894531B (en) * | 2016-12-23 | 2019-11-26 | 温州大学 | The method of light current drainage by electroosmosis ruling by law reason buildings leakage device and improvement leak |
| CN108181197A (en) * | 2018-01-17 | 2018-06-19 | 湖北水总水利水电建设股份有限公司 | It is a kind of for judging to become silted up, the device and method of the best Intervention Timing of sludge soil electric osmose |
| CN108181197B (en) * | 2018-01-17 | 2023-12-12 | 湖北水总水利水电建设股份有限公司 | Device and method for judging optimal intervention time of silt and sludge electroosmosis |
| CN110293125A (en) * | 2019-04-28 | 2019-10-01 | 南通大学 | It is a kind of original position electro reclamation and reinforce ultra-soft Polluted Soil device and method |
| CN111270566A (en) * | 2020-03-24 | 2020-06-12 | 固远晨通科技发展有限公司 | Railway roadbed drainage device, repair structure and slurry-turning mud-pumping remediation method |
| CN113846656A (en) * | 2021-09-16 | 2021-12-28 | 沈阳建筑大学 | Device for reinforcing multi-layer soft rock slope of strip mine |
| CN113846656B (en) * | 2021-09-16 | 2022-12-13 | 沈阳建筑大学 | Device for reinforcing multi-layer soft rock slope of strip mine |
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| WO2015192752A1 (en) | 2015-12-23 |
| CN104131549B (en) | 2016-04-13 |
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