CN103541348A - System and method for reinforcing sand-contained soil interlayer soft foundation in vacuum-electro-osmosis combination mode - Google Patents

System and method for reinforcing sand-contained soil interlayer soft foundation in vacuum-electro-osmosis combination mode Download PDF

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CN103541348A
CN103541348A CN201310469137.7A CN201310469137A CN103541348A CN 103541348 A CN103541348 A CN 103541348A CN 201310469137 A CN201310469137 A CN 201310469137A CN 103541348 A CN103541348 A CN 103541348A
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electrode
drainage
draining
vacuum
sand
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CN103541348B (en
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丁选明
卢一为
李平
孔纲强
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Hohai University HHU
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Abstract

The invention discloses a system for reinforcing a sand-contained soil interlayer soft foundation in a vacuum-electro-osmosis combination mode. The system is composed of subsection EKG drainage electrodes, flexible conductive joints, conductive circuits, a direct-current power supply, a power supply control system, plastic drainage boards, horizontal drainage pipelines, a vacuum pump and the like. The subsection EKG drainage electrodes are connected with one another through the flexible conductive joints, the rough drainage electrodes are used in a soft soil layer, the fine drainage electrodes are used in a sand soil layer, each fine drainage electrode is sleeved with a corrosion-resistant insulating rubber tube, and part, located on a sand soil interlayer, of the drainage boards are wound with a ring of water-proof material through strong water-proof adhesives. The invention further discloses a use method of the system, static sounding is conducted on the positions of the drainage electrodes and the positions of the drainage boards, processing and assembling are conducted on the drainage boards and the drainage electrodes according to results, and finally the soft foundation is reinforced in the vacuum pre-compaction and electro-osmosis drainage combination mode. The system can reinforce the sand-contained soil interlayer soft foundation by combining a vacuum pre-compaction ground treatment method and an electro-osmosis drainage ground treatment method.

Description

Vacuum electroosmosis joint reinforcement is containing the system and method for sand intercalation soft soil ground
Technical field
The invention belongs to Soft Soil Subgrade Treatment Techniques field, particularly a kind of vacuum electroosmosis joint reinforcement is containing the system and method for sand intercalation soft soil ground.
Background technology
Technique of soft soil foundation treatment has been used widely in China since the eighties, it is the effective soft-soil foundation treatment method of a kind of maturation, but there is following shortcoming and defect in the method: (1) is for the soft foundation containing sand interlayer, because sandy soils drainage performance is good, carry out vacuum preloading and process general poor effect; (2) vacuum preloading can only be discharged the Free water in soil, and helpless to the combination water in the soil body; (3) vacuumize and make the soil body reach the time that certain fixed index need to be longer, treatment cycle is longer.
Electric drainage method is a kind of efficient soft-soil foundation treatment method, and in engineering, conventional reinforcing bar is as anode at present, and easily perforate steel pipe is as negative electrode, and anode and negative electrode are in a row installed in pairs.This form electrode is easy for installation, with low cost, but has a lot of deficiencies: when (1) contains sand interlayer in pending Soft Soil Layer, under the connection of pore water, electric osmose circuit is easily short-circuited, and causes the loss of personnel's equipment; (2) anode and negative electrode adopt the electrode of different structure, cannot use electrode switch technology, and treatment effect in the plane can be inhomogeneous; (3) under the effect of electric current, electrode be easy to the soil body in mineralogical composition generation chemical reaction, cause electrode corrosion to damage; (4) impact that electric drainage is recharged by rainwater is very large.
It is the reinforcing soft foundation new technology growing up in recent years that utilization is combined in vacuum preloading and electric drainage, because conventional metal electrode can eject the soil body and pierces through vacuum diaphragm and cause gas leakage processing the later stage, affect the effect of vacuum preloading, and for can not directly adopting vacuum preloading and electroosmotic drainage containing sand intercalation soft soil ground, make to combine and use electric drainage and vacuum preloading processing to be difficult to realize containing sand intercalation soft soil ground.
 
Summary of the invention
The object of the invention is to overcome above-mentioned defect, the system and method for a kind of vacuum electroosmosis joint reinforcement containing sand intercalation soft soil ground is provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of vacuum electroosmosis joint reinforcement, containing the system of sand intercalation soft soil ground, comprises segmented EKG draining electrode, compliant conductive joint, conducting wire, dc source, power control system, plastic draining board, horizontal drainage pipeline and vacuum pump etc.Segmented draining electrode has two kinds of models of thickness, at weak soil interval, use thick draining electrode, in sand sandwich segment, use thin draining electrode, thin draining electrode jacket one deck anticorrosive insulation sebific duct makes to insulate between electrode and the soil body, and segmented draining electrode connects by compliant conductive joint according to static sounding result.Band drain makes between band drain and the soil body waterproof in the part of sand sandwich segment with strengthened water proof adhesive winding one circle waterproofing materials.Draining electrode and band drain are inserted to preset position, power supply respectively with negative electrode and anodic bonding, and access power-supply management system.By draining electrode and band drain access horizontal drainage arm, horizontal drainage arm is aggregated into horizontal drainage supervisor, is finally connected with vacuum pump.
Vacuum electroosmosis joint reinforcement, containing a method for sand intercalation soft soil ground, adopts following technical step to realize:
(1) according to the position of the preset draining electrode of designing requirement and plastic draining board, electrode spacing is preferably taked the spacing of prefabricated drain of 2 ~ 3 times, at each preset position, carries out static sounding, obtains clay distribution and the character of preset position;
(2) leveling place, lays the thick sand cushion of one deck 30cm-50cm;
(3) during laying sand cushion, according to static sounding analysis result, with compliant conductive joint assembling draining electrode, at weak soil interval, use thick draining electrode, in sand sandwich segment, use thin draining electrode, thin draining electrode jacket one deck anticorrosive insulation sebific duct makes to insulate between electrode and the soil body, is then inserted in the filter bag made from filter cloth; At band drain, in strengthened water proof adhesive parcel one deck impermeable material for sand interval, make between band drain and the soil body waterproof.
(4) utilize sheeting machine to set plastic draining board, in the position of preset electrode, do not beat band drain and only with sheeting machine, punch, after pore-forming, insert immediately the EKG draining electrode assemble, the draining electrode 5 ~ 10cm that bassets, for being connected of horizontal drainage arm and conducting wire;
(5) layout conducting wire, ground on the scene and horizontal drain pipe, horizontal drainage arm is consistent with plastic draining distance between plates, horizontal drainage supervisor spacing 10m-15m;
(6) same row's band drain and draining electrode are connected on same horizontal drainage arm, band drain adopts the method for curling up to be connected with horizontal drainage arm, and draining electrode adopts threeway to be connected with horizontal drainage arm, finally branch drain is connected with supervisor, supervisor is connected to vacuum pump, every 1000m 2-1500m 2arrange a vacuum pump;
(7), using draining electrode one row as negative electrode, an adjacent row, as anode, connects by open traverse respectively.Open traverse connects main traverse line by penetration type insulating clamp, finally main traverse line is connected to dc source and power control system;
(8) on horizontal drain pipe and conducting wire, lay one deck geotextiles, in geotextiles, lay 2 ~ 3 layers of vacuum diaphragm, electric drainage system is covered under film, by then backfill clay the compacting of vacuum diaphragm indentation sealing ditch;
(9) start vacuum pump and start to vacuumize, connect dc source simultaneously and start electric drainage.Negative pressure of vacuum is delivered to by gutter in the cavity of draining electrode and plastic draining board, in ground, spreads.Between conducting wire, draining electrode and electrode, the soil body forms current loop, between anode and negative electrode, produces electrical potential difference.On the one hand, the Free water in soft base is collected under the effect of negative pressure of vacuum in plastic draining board and draining electrode, finally by gutter, discharges; On the other hand, hydrone has polarity, under the effect of electrical potential difference, by anode, to negative electrode, is collected, and electroosmosis has simultaneously increased the activity of hydrone, has accelerated rate of infiltration.In addition, electroosmosis can also impel the combination water in the soil body depart from the constraint of soil particle and discharge, and further reduces the moisture content of the soil body.Under the synergy of negative pressure of vacuum and electric osmose, the rapid discharging consolidation of the soil body produces sedimentation;
(10) in electric osmose process, utilize power control system to control the working time of power supply, carry out intermittently power-on, improve the efficiency of electric osmose.In addition, should manually change the both positive and negative polarity wiring of electric osmose system every 3 ~ 5 days, carry out polarity conversion, the direction of EOF also produces corresponding change, can improve like this uniformity of consolidated subsoil;
(11) during, carry out on-the-spot every monitoring, draw settlement-time relation curve, until settlement stability meets after unloading condition, stop electric osmose and vacuum preloading.
Advantage of the present invention and effect are:
(1) two kinds of electrodes of thickness can be according to on-the-spot soil layer situation flexible assembling, for any more complicated containing sand intercalation soft soil ground, all can utilize combined vacuum precompressed-electroosmotic drainage to carry out effective consolidation process;
(2) adopt EKG draining electrode, make the effective combination of vacuum preloading and electric drainage, have complementary advantages, electric osmose increases the penetrating power of water in soft base, accelerate the consolidation rate of vacuum preloading and can further reduce soil moisture content, vacuum preloading makes soil body densification fixed for electric drainage provides vacuum pressure, and prevents for electric osmose provides upper overlay film the impact that rainwater recharges;
(3) draining electrode is that the segmented electrode assembling by regular lengths such as 0.5m, 1m forms by compliant conductive joint, can bear bending to a certain degree, can not pierce through vacuum diaphragm with foundation settlement, has guaranteed effective combination of vacuum preloading and electric drainage.
(4) draining electrode and compliant conductive joint all adopt resistant material to make, survivable in the soil body, can be in long-term work under film;
(5) electric osmose system is all positioned at below vacuum diaphragm, and the later stage can be carried and process the consolidation rate of accelerating the soil body at the enterprising windrow of vacuum diaphragm;
(6) for the sand interlayer in soft foundation, do not need to carry out consolidation process, this method can effectively be saved electric power, reduces costs, and avoids construction equipment and personnel's damage.
(7) segmented EKG draining electrode can flexural deformation in foundation settlement process, and each segment electrode adopts compliant conductive joint to connect, so draining electrode can not puncture vacuum diaphragm in upper top due to foundation settlement, avoids gas leakage to occur;
Economical and effective of the present invention, save the duration, applicable to soil layer of different nature, consolidation effect is remarkable, is that a kind of processing is containing the reinforcement means of the economical and efficient of sand intercalation soft soil ground.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Protection scope of the present invention is not limited with the specific embodiment, but is limited by claim.
Accompanying drawing explanation
Fig. 1 is that vacuum-electric osmose joint reinforcement of the present invention is containing the layout plan of sand intercalation soft soil ground;
Fig. 2 is that vacuum-electric osmose joint reinforcement of the present invention is containing the generalized section of sand intercalation soft soil ground;
Fig. 3 is the schematic diagram of three kinds of forms of compliant conductive joint in the present invention.
In figure, 1 is the thick draining electrode of EKG, and 2 is the thin draining electrode of EKG, and 3 is compliant conductive joint, 4 is draining electrode after assembling, and 5 is plastic draining board, and 6 is electric osmose open traverse, 7 is electric osmose main traverse line, and 8 is horizontal drainage arm, and 9 is horizontal drainage supervisor, 10 is dc source, and 11 is vacuum pump, and 12 is sand cushion, 13 is horizontal drainage pipeline, and 14 is conducting wire, and 15 is geotextiles, 16 is vacuum diaphragm, and 17 is anticorrosive insulation sebific duct, and 18 is waterproofing materials.
The specific embodiment
As illustrated in fig. 1 and 2, vacuum-electric osmose joint reinforcement, containing a system for sand intercalation soft soil ground, comprises segmented EKG draining electrode, compliant conductive joint 3, conducting wire 14, dc source 10, power control system, plastic draining board 5, horizontal drainage pipeline 13 and vacuum pump 11 etc.Segmented draining electrode has two kinds of models of thickness, at weak soil interval, use thick draining electrode 1, in sand sandwich segment, use thin draining electrode 2, thin draining electrode 2 overcoat one deck anticorrosive insulation sebific ducts 17 make to insulate between electrode and the soil body, and segmented draining electrode connects by compliant conductive joint 3 according to static sounding result.Band drain 5 makes between band drain 5 and the soil body waterproof in the part of sand sandwich segment with strengthened water proof adhesive winding one circle waterproofing materials.Draining electrode 4 and band drain 5 inserted to preset positions, power supply respectively with negative electrode and anodic bonding, and access power-supply management system.By draining electrode 4 and band drain 5 access horizontal drainage arms 8, horizontal drainage arm 8 is aggregated into horizontal drainage supervisor 9, is finally connected with vacuum pump 11.
Vacuum-electric osmose joint reinforcement, containing a method for sand intercalation soft soil ground, can adopt following technical step to realize:
1. as shown in Figure 1, according to the position of the pitch arrangement plastic draining board (5) of 1m * 1m, according to the pitch arrangement of 2m * 2m, plug the position of draining electrode (4), at each preset position, carry out static sounding, thereby obtain clay distribution and the character of each position;
2. leveling place, lays the thick sand cushion (12) of one deck 30cm-50cm;
3. during laying sand cushion (12), assemble and process draining electrode (4) and band drain (5), according to each position static sounding analysis result, with compliant conductive joint (3), assemble thick draining electrode (1) contacts the draining electrode (4) after assembling with thin draining electrode (2) in sandy soils with soil body insulation,, be then inserted in the filter bag made from filter cloth; At band drain (5), in sand interval, partly with strengthened water proof adhesive, wrap up one deck waterproofing materials (18), make between band drain and the soil body waterproof;
4. utilize sheeting machine to set plastic draining board (5), in the position of preset electrode, do not beat band drain and only utilize sheeting machine punching, after pore-forming, insert immediately the EKG draining electrode (4) assembling, the draining electrode 5 ~ 10cm that bassets, for being connected of horizontal drainage pipeline (13) and conducting wire (14);
5. at the upper horizontal drainage pipeline (13) of arranging of sand cushion (12), horizontal drainage pipeline (13) consists of horizontal drainage arm (8) and horizontal drainage supervisor (9), the spacing of horizontal drainage arm (8) is consistent with plastic draining board (5) spacing, horizontal drainage supervisor (9) spacing 10m-15m;
6. by reserved section of plastic draining board (5), curl up upper at horizontal drainage arm (8), use steel wire tighten; Same row's EKG draining electrode (4) is connected with horizontal drainage arm (8) by threeway.Horizontal drainage arm (8) is connected to form horizontal drainage pipeline (13) by threeway and horizontal drainage supervisor (9), and horizontal drainage pipeline (13) is imbedded to sand cushion (12);
7. in the upper conducting wire (14) of arranging of sand cushion (12), conducting wire (14) are comprised of electric osmose open traverse (6) and electric osmose main traverse line (7).Electric osmose open traverse (6) spacing is consistent with draining electrode (4) spacing as shown in Figure 1, and arranges electric osmose main traverse line (7) in outside, stabilization zone, and electric osmose open traverse (6) and electric osmose main traverse line (7) all can adopt copper core rubber-sheathed wire;
8. draining electrode (4) is connected with penetration type insulating clamp with electric osmose open traverse (6), sealing structure is good, anticorrosion, waterproof.As shown in Figure 1 using row's electrode as anode, adjacent row's electrode is as negative electrode, respectively the open traverse (6) of anode and negative electrode is connected to main traverse line (7) by penetration type insulating blanked clamper and forms conducting wire (14), and conducting wire (14) are imbedded in sand cushion (12);
9. on sand cushion, (12) lay one deck geotextiles (15), and in upper 2 ~ 3 layers of vacuum diaphragm (16) of laying of geotextiles (15), vacuum diaphragm (16) is polyethylene sheeting;
10. electric drainage system is covered under vacuum diaphragm (16), by then backfill clay the compacting of vacuum diaphragm indentation sealing ditch;
11. are connected through vacuum diaphragm (16) horizontal drainage supervisor (9) with vacuum pump (11), and guarantee that in the sealing of membrane place vacuum diaphragm is air tight;
12. are connected with the positive pole of dc source (10) main traverse line (7) of anode and negative electrode with negative pole, starting vacuum pump (11) starts to vacuumize, check and whether leak gas simultaneously, require vacuum under film to be more than or equal to 80kPa, when not reaching vacuum requirement, must take to add pump measure and check sealing situation;
13. start dc source (10) when vacuumizing carries out electric drainage.Supply voltage should be tried one's best large but is no more than 72V safe voltage.Electric osmose process adopts the method for intermittently power-on on the one hand, as every work has a power failure 1 hour for 2 ~ 3 hours.Can adopt power control system to set the working time; Adopt on the one hand in addition the method for polarity conversion, every conversion of carrying out a secondary cathode and anode for 3 ~ 5 days;
14. carry out on-the-spot every monitoring, draw settlement-time relation curve, after settlement stability meets unloading condition, stop electric osmose and vacuum preloading.

Claims (2)

1. a vacuum electroosmosis joint reinforcement is containing the system of sand intercalation soft soil ground, comprise segmented EKG draining electrode, compliant conductive joint, conducting wire, dc source, power control system, plastic draining board, horizontal drainage pipeline and vacuum pump, it is characterized in that: segmented draining electrode has two kinds of models of thickness, at weak soil interval, use thick draining electrode, in sand sandwich segment, use thin draining electrode, thin draining electrode jacket one deck anticorrosive insulation sebific duct makes to insulate between electrode and the soil body, segmented draining electrode connects by compliant conductive joint according to static sounding result, band drain makes between band drain and the soil body waterproof in the part of sand sandwich segment with strengthened water proof adhesive winding one circle waterproofing materials, draining electrode and band drain are inserted to preset position, power supply respectively with negative electrode and anodic bonding, and access power-supply management system, by draining electrode and band drain access horizontal drainage arm, horizontal drainage arm is aggregated into horizontal drainage supervisor, finally be connected with vacuum pump.
2. based on a kind of vacuum electroosmosis joint reinforcement claimed in claim 1, contain the using method of the system of sand intercalation soft soil ground, comprise following technical step:
(1) according to the position of the preset draining electrode of designing requirement and plastic draining board, electrode spacing is preferably taked the spacing of prefabricated drain of 2 ~ 3 times, at each preset position, carries out static sounding, obtains clay distribution and the character of preset position;
(2) leveling place, lays the thick sand cushion of one deck 30cm-50cm;
(3) during laying sand cushion, according to static sounding analysis result, with compliant conductive joint assembling draining electrode, at weak soil interval, use thick draining electrode, in sand sandwich segment, use thin draining electrode, thin draining electrode jacket one deck anticorrosive insulation sebific duct makes to insulate between electrode and the soil body, is then inserted in the filter bag made from filter cloth; At band drain, in strengthened water proof adhesive parcel one deck impermeable material for sand interval, make between band drain and the soil body waterproof;
(4) utilize sheeting machine to set plastic draining board, in the position of preset electrode, do not beat band drain and only with sheeting machine, punch, after pore-forming, insert immediately the EKG draining electrode assemble, the draining electrode 5 ~ 10cm that bassets, for being connected of horizontal drainage arm and conducting wire;
(5) layout conducting wire, ground on the scene and horizontal drain pipe, horizontal drainage arm is consistent with plastic draining distance between plates, horizontal drainage supervisor spacing 10m-15m;
(6) same row's band drain and draining electrode are connected on same horizontal drainage arm, band drain adopts the method for curling up to be connected with horizontal drainage arm, and draining electrode adopts threeway to be connected with horizontal drainage arm, finally branch drain is connected with supervisor, supervisor is connected to vacuum pump, every 1000m 2-1500m 2arrange a vacuum pump;
(7) using draining electrode one row as negative electrode, an adjacent row, as anode, connects by open traverse respectively, and open traverse connects main traverse line by penetration type insulating clamp, finally main traverse line is connected to dc source and power control system;
(8) on horizontal drain pipe and conducting wire, lay one deck geotextiles, in geotextiles, lay 2 ~ 3 layers of vacuum diaphragm, electric drainage system is covered under film, by then backfill clay the compacting of vacuum diaphragm indentation sealing ditch;
(9) start vacuum pump and start to vacuumize, connect dc source simultaneously and start electric drainage;
(10) in electric osmose process, utilize power control system to control the working time of power supply, carry out intermittently power-on, improve the efficiency of electric osmose, in addition, every 3 ~ 5 days, change the both positive and negative polarity wiring of electric osmose system, carry out polarity conversion;
(11) during, carry out on-the-spot every monitoring, draw settlement-time relation curve, until settlement stability meets after unloading condition, stop electric osmose and vacuum preloading.
CN201310469137.7A 2013-10-10 2013-10-10 System and method for reinforcing sand-contained soil interlayer soft foundation in vacuum-electro-osmosis combination mode Active CN103541348B (en)

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Cited By (9)

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CN104131549A (en) * 2014-06-16 2014-11-05 武汉河海泽地电渗科技有限公司 Electro-osmotic drainage consolidation method for electrode pipes
CN104294813B (en) * 2014-10-08 2016-02-03 庄艳峰 A kind of stagewise electrode tube for electric drainage consolidation
CN106245621A (en) * 2016-07-27 2016-12-21 济南轨道交通集团有限公司 A kind of electric osmose inverted well construction method
CN108343051A (en) * 2018-03-10 2018-07-31 杭州渗源环境科技有限公司 A kind of mixing cured processing method of electric osmose for shallow layer foundation
CN108677920A (en) * 2018-05-21 2018-10-19 中山大学 Prevent the water in overlying permeable ground from penetrating into the device of rigid drainage pipe/monitoring pipe
CN109137882A (en) * 2018-08-29 2019-01-04 中国港湾工程有限责任公司 The method for processing foundation of Full-automatic variable-frequency formula vacuum pre-pressed joint electric osmose
CN109252506A (en) * 2018-08-17 2019-01-22 温州大学 The system and technique of horizontal drainage vacuum preloading combined with electroosmosis reinforcing soft ground
CN110670574A (en) * 2019-10-13 2020-01-10 南通大学 Enhanced electroosmosis method and system for reinforcing soft clay foundation
CN110723878A (en) * 2019-10-11 2020-01-24 上海大学 Electroosmosis-medicament vacuum preloading method

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CN102535432A (en) * 2011-12-26 2012-07-04 河海大学 Vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system and method
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CN104131549A (en) * 2014-06-16 2014-11-05 武汉河海泽地电渗科技有限公司 Electro-osmotic drainage consolidation method for electrode pipes
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CN104294813B (en) * 2014-10-08 2016-02-03 庄艳峰 A kind of stagewise electrode tube for electric drainage consolidation
CN106245621A (en) * 2016-07-27 2016-12-21 济南轨道交通集团有限公司 A kind of electric osmose inverted well construction method
CN108343051A (en) * 2018-03-10 2018-07-31 杭州渗源环境科技有限公司 A kind of mixing cured processing method of electric osmose for shallow layer foundation
CN108677920A (en) * 2018-05-21 2018-10-19 中山大学 Prevent the water in overlying permeable ground from penetrating into the device of rigid drainage pipe/monitoring pipe
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CN109252506A (en) * 2018-08-17 2019-01-22 温州大学 The system and technique of horizontal drainage vacuum preloading combined with electroosmosis reinforcing soft ground
CN109137882A (en) * 2018-08-29 2019-01-04 中国港湾工程有限责任公司 The method for processing foundation of Full-automatic variable-frequency formula vacuum pre-pressed joint electric osmose
CN109137882B (en) * 2018-08-29 2020-08-04 中国港湾工程有限责任公司 Full-automatic frequency conversion type vacuum preloading and electroosmosis combined foundation treatment method
CN110723878A (en) * 2019-10-11 2020-01-24 上海大学 Electroosmosis-medicament vacuum preloading method
CN110670574A (en) * 2019-10-13 2020-01-10 南通大学 Enhanced electroosmosis method and system for reinforcing soft clay foundation

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