CN102979082A - Method for consolidating soft soil foundation by using vacuum and magnetic field compound preloading - Google Patents
Method for consolidating soft soil foundation by using vacuum and magnetic field compound preloading Download PDFInfo
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- CN102979082A CN102979082A CN2012105894232A CN201210589423A CN102979082A CN 102979082 A CN102979082 A CN 102979082A CN 2012105894232 A CN2012105894232 A CN 2012105894232A CN 201210589423 A CN201210589423 A CN 201210589423A CN 102979082 A CN102979082 A CN 102979082A
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Abstract
The invention discloses a method for consolidating soft soil foundation by using vacuum and magnetic field compound preloading. The action of a magnetic field is introduced into vacuum preloading and surcharging processes, and the vacuum preloading, the magnetic field and surcharging preloading are conducted simultaneously, so that the action time is not required to be exerted independently, the construction period and the cost are saved, and the consolidating effect can be improved. The magnetic field induces water to generate molecular sensing magnetic torques, and the interaction of the molecular sensing magnetic torques can change the viscosity of water in the soil, increase the diffusion and permeation speeds of the water and promote the permeability of the water effectively; and the magnetic field can not only act on free water in the soil, but also act on bound water to enable the water to be free from constraint and drained in a certain direction in a permeating manner, so that a consolidating purpose is achieved. The magnetic field can also change certain physical properties of soil particles, such as the caking property, the swelling amount, the surface tension, the aggregation function and the like; and a consolidating function can be reinforced, the consolidating speed can be increased, and manpower and material resources consumed in foundation processing are saved by the aid of the fact that the magnetic field can facilitate drainage consolidation.
Description
Technical field
The invention belongs to the foundation treatment technology field, particularly a kind of method of utilizing the reinforcing soft ground of the compound precompressed of vacuum magnetic field.
Background technology
In construction work, unfavorable foundation soil processed with the method for reinforcing generally displacement method, preloading, compacting and compacting method, reinforcement method and grouting etc.Select wherein a kind of or several combination for the difference of soil property, finish the processing to foundation soil.
For the weak argillic horizon owing to marine facies, lacustrine facies and river facies deposition, its water content is large, compressibilty is high, intensity is low, and bad hydraulic permeability can produce larger sedimentation and differential settlement under the building load effect, for large-area construction, must carry out consolidation process and reinforcing to such ground.Chinese patent: 200610096961, reinforcement method of deep layer soft soil foundation; Chinese patent, publication number: CN102535432A, the system and method for a kind of vacuum-electric osmose-soft base of preloading joint reinforcement; Chinese patent, publication number: CN200810018498, a kind of reinforcement means of soft foundation, these patents have all adopted electroosmosis method and vacuum and loading method to combine to promote draining and reinforcing process.
This patent proposes to utilize the method for the compound pre-pressing and reinforcing soft earth foundation of vacuum preloading and magnetic field, is the effect that has increased magnetic field on known patent method basis.Induced by magnetic field water generates molecule induction magnetic moment, the interaction of molecule induction magnetic moment can change the viscosity of water in the soil, improves its scattering and permeating speed, can effectively promote the infiltration of water; Magnetic field not only can act on the Free water in the soil, also can act in conjunction with water, impels it to break away from constraint, permeates discharge along certain direction, thereby plays the purpose of reinforcing.Magnetic field also may change some physical propertys of soil particle, such as caking property, and swell increment, surface tension is reunited with turning into and is used etc., utilizes its one side that is beneficial to discharging consolidation can strengthen consolidation, improves consolidation rate, saves ground and processes the manpower and materials that expend.
Described magnetic field can be Weak magentic-field, or high-intensity magnetic field, can make alternating magnetic field, and D.C. magnetic field or both stacks can also be used gradient magnetic, and magnetic field intensity can change at 0-20000Gs.The foundation in magnetic field can realize by the various ways such as electromagnetic coil of permanent magnet, energising.
Summary of the invention
The invention provides a kind of method of utilizing the reinforcing soft ground of the compound precompressed of vacuum magnetic field, its effect with magnetic field is introduced in the process of vacuum preloading and piling prepressing, carry out simultaneously by vacuum preloading, magnetic field and three kinds of techniques of piling prepressing, do not need independently to apply the time of effect, saved the duration greatly, save expense, and can improve the effect of reinforcing.
Technical scheme of the present invention may further comprise the steps:
(1) lays the thick sand cushion of one deck 30-50cm at pretreated soft foundation.
(2) excavation buries the sealing ditch that covers the vacuum seal film around the soft foundation place.
(3) set the plastic draining board that is wound with coil and the plastic draining board that is not wound with coil, the plastic draining board interval that is wound with coil arranges that the plastic draining board that is wound with coil arranges that coil end is connected with the conducting wire in the interval side by side.
(4) arrange horizontal drain pipe in the soft foundation place, the horizontal drainage arm is consistent with the plastic draining distance between plates.
Plastic drain-pipe and the draining electrode that (5) will be in same row are connected on the same horizontal drainage arm, and the reservation section that plastic draining board bassets is wrapped on the horizontal drainage arm.Every 1000m ~ 1500m arranges a vacuum pump; The horizontal drainage arm links to each other with the horizontal drainage supervisor, and the horizontal drainage supervisor connects vacuum pump.
(6) lay one deck geotextiles at horizontal drain pipe and conducting wire, lay the vacuum seal film in geotextiles, vacuum and magnetic field drainage system are covered under the vacuum seal film, the vacuum seal mould is entered to seal ditch then backfill clay and compacting.
(7) start vacuum pump and vacuumize, and start power supply and begin magnetic fields, carry out simultaneously in vacuum preloading and magnetic field.The effect in magnetic field can adopt batch (-type) to carry out mode, to increase validity and the uniformity of consolidation.
After vacuumizing 5 ~ 10 days, vacuum reaches more than the 80kPa under the film, after checking that definite vacuum diaphragm is without gas leakage and field system steady operation, carries precompressed at the enterprising windrow of vacuum diaphragm.Preloading can be adopted and build the clay cofferdam in vacuum diaphragm then cover water in the cofferdam, perhaps mound after vacuum diaphragm is laid geotextiles and sand cushion.After the preloading, vacuum preloading, magnetic field and piling prepressing three carry out simultaneously, unload after reaching the sedimentation design standard.
Vacuum is delivered to arm from the horizontal drainage supervisor, is delivered to the cavity of plastic draining board from arm, and spreads to soft foundation.Give simultaneously coil electricity, form magnetic field between the adjacent plastic draining board that two are full of coil.Free water in the soft foundation is compiled to plastic draining board and draining electrode under the effect in negative pressure of vacuum and magnetic field.Discharge by horizontal pipe network.Under magnetic fields, the viscosity of hydrone reduces, and the permeability of soil increases, and water content reduces, also so that the process acceleration of whole discharging consolidation.Under the synergy of vacuum, magnetic field and piling prepressing, the rapid discharging consolidation of the soil body, ground produces consolidation settlement.
The present invention introduces the effect in magnetic field in the process of vacuum preloading and piling prepressing, has initiative.Vacuum preloading, magnetic field and three kinds of techniques of piling prepressing are carried out simultaneously in this method, do not need independently to apply the time of effect, have saved the duration greatly, are for existing patent: the improvement of the system and method for a kind of vacuum-electric osmose-soft base of preloading joint reinforcement.
Description of drawings
Fig. 1 is the System planes arrangement diagram of vacuum-magnetic field of the present invention-preloading joint reinforcement soft foundation.
Fig. 2 is system's generalized section of vacuum-magnetic field of the present invention-preloading joint reinforcement soft foundation.
Fig. 3 is magnetic fields principle schematic of the present invention
Among the figure: 1 plastic draining board, 2 horizontal drainage arms, 3 horizontal drainages supervisor, 4 magnetic field open traverses,
5 magnetic field main traverse lines, 6 vacuum pumps, 7 power supplys; 8 sand cushions, 9 horizontal drainage pipelines, 10 conducting wires, 11 geotextiles, 12 vacuum diaphragm, 13 water or sand, 14 wax walls, 15 sealing ditches, 16 cofferdam,
17 coils.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, 2, 3, the system of a kind of vacuum-magnetic field-preloading joint reinforcement soft foundation, the compositions such as wire circuit 10, plastic draining board 1, coil 17, horizontal drainage pipeline 3, vacuum pump 6, power supply 7.
The method of a kind of vacuum-magnetic field-preloading joint reinforcement soft foundation, can adopt following technical step to realize:
(1) arrangement place and lay the thick sand cushion of one deck 30-50cm 8.
(2) if ground accompanies layer of sand, for preventing gas leakage envelope wall 14 need be set.
(3) coiling 17 is made the device that produces magnetic field on plastic draining board 1.
(5) utilize sheeting machine to set to be wound with the plastic draining board 1 spacing 1.5mX1.5m of coil, plastic draining board 1 is determined embedded depth, the above 0.5m. that reserves in ground according to thickness of soft soil.The plastic draining board that is wound with coil is arranged at the interval side by side.Coil end is connected with conducting wire 10.
(7) arrange horizontal drainage pipeline 2,3 at sand cushion 8, horizontal drainage is responsible for 3 spacing 10m-15m, horizontal drainage arm 2 spacing 1.5mX1.5m.The horizontal drainage pipeline is imbedded in the sand cushion 8.
(8) lay one deck geotextiles 11 at sand cushion 8, geotextiles 11 forms horizontal drainage and vacuum transmission system jointly with sand.
(9) arrange conducting wire, magnetic field 10 at sand cushion 18.
The plastic draining board that (10) will be in same row is connected on the same horizontal drainage arm, and the reservation section that plastic draining board bassets is wrapped in 2 ~ 3 circles on the horizontal drainage arm.Arm links to each other with supervisor, and supervisor connects vacuum pump, and every 1000m2 ~ 1500m2 arranges a vacuum pump.
(11) laying vacuum diaphragm 12. vacuum diaphragm materials in geotextiles 11 is polyethylene, and thickness is determined according to designing requirement.
(12) at the envelope wall 14 inboard 1.5 dark sealing ditches 15 that excavate, vacuum diaphragm 12 is put into, and used the bury backfill compacting.
(13) horizontal drain pipe 3 is passed vacuum diaphragm 12 and be connected with vacuum pump 6, and carry out relevant sealing.
(14) bottom of simultaneously negative electrode of field coil being connected sealing ditch 15 with anode is connected with being connected with the negative pole of power supply 7.
(15) start vacuum pump 6 and draw water, whether checking leaks gas is strengthened the vacuum maintenance.
(16) opening power is carried out the effect in magnetic field when vacuum is drawn water.Magnetic fields can adopt the intermittently power-on method, also can adopt the polarity transformation approach, carries out the conversion of a secondary cathode and anode in every 2-3 days.
(17) after vacuumizing 5 ~ 10 days, the vacuum under the vacuum diaphragm reaches more than the 80kPa, carries out piling prepressing.The preloading scheme can adopt shown in Figure 2ly builds clay cofferdam 16 in sealing ditch 15 inboards, and water filling 13 is carried out water covering prepressing, perhaps mound precompressed in the cofferdam.After the preloading, vacuum preloading, magnetic field and piling prepressing three carry out simultaneously, unload after reaching the sedimentation design standard.
Claims (3)
1. method of utilizing the reinforcing soft ground of the compound precompressed of vacuum magnetic field is characterized in that following following steps:
(1) lays the thick sand cushion of one deck 30-50cm at pretreated soft foundation;
(2) excavation buries the sealing ditch that covers the vacuum seal film around the soft foundation place;
(3) set the plastic draining board that is wound with coil, the plastic draining board that is wound with coil arranges that coil end is connected with the conducting wire in the interval side by side;
(4) arrange horizontal drain pipe on the soft foundation place, the horizontal drainage arm is consistent with the plastic draining distance between plates;
The plastic drain-pipe that (5) will be in same row is connected on the same horizontal drainage arm, and the reservation section that plastic draining board bassets is wrapped on the horizontal drainage arm; Every 1000m ~ 1500m arranges a vacuum pump; The horizontal drainage arm links to each other with the horizontal drainage supervisor, and the horizontal drainage supervisor connects vacuum pump;
(6) lay one deck geotextiles at horizontal drain pipe and conducting wire, lay the vacuum seal film in geotextiles, vacuum and magnetic field drainage system are covered under the vacuum seal film, the vacuum seal mould is entered to seal ditch then backfill clay and compacting;
(7) start vacuum pump and vacuumize, and start power supply and begin magnetic fields, carry out simultaneously in vacuum preloading and magnetic field; After vacuumizing 5 ~ 10 days, vacuum reaches more than the 80kPa under the film, after checking that definite vacuum diaphragm is without gas leakage and field system steady operation, carries precompressed at the enterprising windrow of vacuum diaphragm; Preloading is adopted and to be built in vacuum diaphragm that water is covered in the clay cofferdam then in the cofferdam or mound after vacuum diaphragm is laid geotextiles and sand cushion; After the preloading, vacuum preloading, magnetic field and piling prepressing three carry out simultaneously, unload after reaching the sedimentation design standard.
2. a kind of method of utilizing the reinforcing soft ground of the compound precompressed of vacuum magnetic field according to claim 1 is characterized in that, the plastic draining board interval that is wound with coil is arranged.
3. a kind of method of utilizing the reinforcing soft ground of the compound precompressed of vacuum magnetic field according to claim 1 and 2 is characterized in that, the effect in magnetic field adopts batch (-type) to carry out mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210589423.2A CN102979082B (en) | 2012-12-27 | 2012-12-27 | Method for consolidating soft soil foundation by using vacuum and magnetic field compound preloading |
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| CN201210589423.2A CN102979082B (en) | 2012-12-27 | 2012-12-27 | Method for consolidating soft soil foundation by using vacuum and magnetic field compound preloading |
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| CN102979082A true CN102979082A (en) | 2013-03-20 |
| CN102979082B CN102979082B (en) | 2014-10-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108164114A (en) * | 2017-11-29 | 2018-06-15 | 东南大学 | A kind of device for dehydrating sladge waste and its dewatering |
| CN110514697A (en) * | 2019-08-23 | 2019-11-29 | 淮阴工学院 | A kind of black cotton regur soil electric osmose experimental rig and test method |
Citations (4)
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|---|---|---|---|---|
| CN101100852A (en) * | 2007-08-06 | 2008-01-09 | 张志铁 | Method for double-vacuum self-loading prepressing and earthwork composite filling low-energy strong-ramming reinforcing soft soil |
| CN101139833A (en) * | 2007-07-20 | 2008-03-12 | 朱怡 | Compound vacuum precompressed soft foundation comprehensive strengthening method |
| JP2010222937A (en) * | 2009-03-25 | 2010-10-07 | Chikami Miltec Inc | Driving device and driving method, and searching device and searching method |
| KR20110100820A (en) * | 2010-03-05 | 2011-09-15 | (주)나노지오이엔씨 | Drain construction method for softclay using conductivity drain board |
-
2012
- 2012-12-27 CN CN201210589423.2A patent/CN102979082B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139833A (en) * | 2007-07-20 | 2008-03-12 | 朱怡 | Compound vacuum precompressed soft foundation comprehensive strengthening method |
| CN101100852A (en) * | 2007-08-06 | 2008-01-09 | 张志铁 | Method for double-vacuum self-loading prepressing and earthwork composite filling low-energy strong-ramming reinforcing soft soil |
| JP2010222937A (en) * | 2009-03-25 | 2010-10-07 | Chikami Miltec Inc | Driving device and driving method, and searching device and searching method |
| KR20110100820A (en) * | 2010-03-05 | 2011-09-15 | (주)나노지오이엔씨 | Drain construction method for softclay using conductivity drain board |
Non-Patent Citations (1)
| Title |
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| 邓波: "静磁场作用下的水的性质改变", 《电子科技大学学报》, vol. 37, no. 6, 30 November 2008 (2008-11-30), pages 959 - 962 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108164114A (en) * | 2017-11-29 | 2018-06-15 | 东南大学 | A kind of device for dehydrating sladge waste and its dewatering |
| CN110514697A (en) * | 2019-08-23 | 2019-11-29 | 淮阴工学院 | A kind of black cotton regur soil electric osmose experimental rig and test method |
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| CN102979082B (en) | 2014-10-15 |
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