CN102979082B - 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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- CN102979082B CN102979082B CN201210589423.2A CN201210589423A CN102979082B CN 102979082 B CN102979082 B CN 102979082B CN 201210589423 A CN201210589423 A CN 201210589423A CN 102979082 B CN102979082 B CN 102979082B
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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 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 is processed with the method for reinforcing and generally had displacement method, preloading, compacting and compacting method, reinforcement method and grouting etc.For the difference of soil property, select a kind of or several combination wherein, complete the processing to foundation soil.
For the weak argillic horizon due 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 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 the soft base of a kind of vacuum-electric osmose-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 on known patent method basis, to have increased the effect in magnetic field.Induced by magnetic field water generates molecule induction magnetic moment, the interaction of molecule induction magnetic moment can change the viscosity of water in 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 soil, also can act in conjunction with water, impels it to depart from constraint, along certain direction, permeates discharge, thereby plays the object of reinforcing.Magnetic field also may change some physical propertys of soil particle, as caking property, and swell increment, surface tension, reunites with turning into and uses 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 by magnetic field is introduced in the process of vacuum preloading and piling prepressing, by vacuum preloading, magnetic field and three kinds of techniques of piling prepressing, carry out simultaneously, 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 comprises the following steps:
(1) on pretreated soft foundation, lay the sand cushion that one deck 30-50cm is thick.
(2) the surrounding excavation in soft foundation place buries the sealing ditch that covers vacuum seal film.
(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, the plastic draining board that is wound with coil arranges at interval side by side, and coil end is connected with conducting wire.
(4) on soft foundation place, arrange horizontal drain pipe, horizontal drainage arm is consistent with plastic draining distance between plates.
(5) plastic drain-pipe in same row and draining electrode are connected on same horizontal drainage arm, reserved section that plastic draining board bassets is wrapped on horizontal drainage arm.Every 1000m～1500m arranges a vacuum pump; Horizontal drainage arm is connected with horizontal drainage supervisor, and horizontal drainage supervisor connects vacuum pump.
(6) on horizontal drain pipe and conducting wire, lay one deck geotextiles, in geotextiles, lay vacuum seal film, vacuum and magnetic field drainage system are covered under vacuum seal film, by then backfill clay the compacting of vacuum seal film indentation sealing ditch.
(7) start vacuum pump and vacuumize, and start power supply and start 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, more than vacuum reaches 80kPa under film, after checking that definite vacuum diaphragm is without gas leakage and field system steady operation, in vacuum diaphragm, carry out piling prepressing.Preloading can adopt builds clay cofferdam and then in cofferdam, covers water in vacuum diaphragm, or in vacuum diaphragm, lays mound after geotextiles and sand cushion.After preloading, vacuum preloading, magnetic field and piling prepressing three carry out simultaneously, unload after reaching sedimentation design standard.
Vacuum is delivered to arm from horizontal drainage supervisor, is delivered to the cavity of plastic draining board, and spreads to soft foundation from arm.Give coil electricity simultaneously, between the adjacent plastic draining board that two are full of coil, form magnetic field.Free water in soft foundation is collected to plastic draining board and draining electrode under the effect in negative pressure of vacuum and magnetic field.By horizontal pipe network, discharge.Under magnetic fields, the viscosity of hydrone reduces, and the permeability of soil increases, and water content reduces, and also makes 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.In this method, vacuum preloading, magnetic field and three kinds of techniques of piling prepressing are carried out simultaneously, do not need independently to apply the time of effect, saved the duration greatly, and be for existing patent: the improvement of the system and method for the soft base of a kind of vacuum-electric osmose-preloading joint reinforcement.
Accompanying drawing explanation
Fig. 1 is the System planes arrangement diagram of vacuum-magnetic field of the present invention-preloading joint reinforcement soft foundation.
Fig. 2 is the system 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
In figure: 1 plastic draining board, 2 horizontal drainage arms, 3 horizontal drainage supervisors, 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
Below in conjunction with drawings and Examples, the present invention is further illustrated.
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.
A method for vacuum-magnetic field-preloading joint reinforcement soft foundation, can adopt following technical step to realize:
(1) arrange place and lay the sand cushion 8 that one deck 30-50cm is thick.
(2) if ground accompanies layer of sand, for preventing that gas leakage from need arrange envelope wall 14.
(3) on plastic draining board 1, coiling 17 is made the device that produces magnetic field.
(4) 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 according to thickness of soft soil, and ground is reserved 0.5m. above.The plastic draining board that is wound with coil is arranged at interval side by side.Coil end is connected with conducting wire 10.
(5) on sand cushion 8, arrange horizontal drainage pipeline 2,3, horizontal drainage is responsible for 3 spacing 10m-15m, horizontal drainage arm 2 spacing 1.5mX1.5m.Horizontal drainage pipeline is imbedded in sand cushion 8.
(6) on sand cushion 8, lay one deck geotextiles 11, geotextiles 11 forms horizontal drainage and vacuum transmission system jointly with sand.
(7) on sand cushion 18, arrange conducting wire, magnetic field 10.
(8) plastic draining board in same row is connected on same horizontal drainage arm, reserved section that plastic draining board bassets is wrapped in 2～3 circles on horizontal drainage arm.Arm is connected with supervisor, and supervisor connects vacuum pump, and every 1000m2～1500m2 arranges a vacuum pump.
(9) in geotextiles 11, laying vacuum diaphragm 12. vacuum diaphragm materials is polyethylene, and thickness is determined according to designing requirement.
(10) in envelope wall 14 inner sides, excavate 1.5 dark sealing ditches 15, vacuum diaphragm 12 is put into, and used bury backfill compacting.
(11) horizontal drain pipe 3 is connected with vacuum pump 6 through vacuum diaphragm 12, and carries out relevant sealing.
(12) negative electrode of field coil is connected with anodal by the sealing bottom of ditch 15 and the negative pole of power supply 7 with anode simultaneously.
(13) start vacuum pump 6 and draw water, whether checking leaks gas is strengthened vacuum maintenance.
(14) when vacuum is drawn water, opening power is carried out the effect in magnetic field.Magnetic fields can adopt intermittently power-on method, also can adopt polarity transformation approach, within every 2-3 days, carries out the conversion of a secondary cathode and anode.
(15), after vacuumizing 5～10 days, more than the vacuum under vacuum diaphragm reaches 80kPa, carry out piling prepressing.Preloading scheme can adopt Fig. 2 to be shown in sealing ditch 15 inner sides and build clay cofferdam 16, and carries out water covering prepressing to water filling 13 in cofferdam, or mound precompressed.After preloading, vacuum preloading, magnetic field and piling prepressing three carry out simultaneously, unload after reaching sedimentation design standard.
Claims (2)
1. utilize a method for the reinforcing soft ground of the compound precompressed of vacuum magnetic field, it is characterized in that comprising the following steps:
(1) on pretreated soft foundation, lay the sand cushion that one deck 30-50cm is thick;
(2) the surrounding excavation in soft foundation place buries the sealing ditch that covers vacuum seal film;
(3) set the plastic draining board that is wound with coil, the plastic draining board that is wound with coil side by side interval arranges, coil end is connected with conducting wire;
(4) on soft foundation place, arrange horizontal drain pipe, horizontal drainage arm is consistent with plastic draining distance between plates;
(5) plastic drain-pipe in same row is connected on same horizontal drainage arm, reserved section that plastic draining board bassets is wrapped on horizontal drainage arm; Every 1000m～1500m arranges a vacuum pump; Horizontal drainage arm is connected with horizontal drainage supervisor, and horizontal drainage supervisor connects vacuum pump;
(6) on horizontal drain pipe and conducting wire, lay one deck geotextiles, in geotextiles, lay vacuum seal film, vacuum and magnetic field drainage system are covered under vacuum seal film, by then backfill clay the compacting of vacuum seal film indentation sealing ditch;
(7) start vacuum pump and vacuumize, and start power supply and start magnetic fields, carry out simultaneously in vacuum preloading and magnetic field; After vacuumizing 5～10 days, more than vacuum reaches 80kPa under film, after checking that definite vacuum diaphragm is without gas leakage and field system steady operation, in vacuum diaphragm, carry out piling prepressing; Mound after preloading adopts and to build clay cofferdam then cover water or lay geotextiles and sand cushion in cofferdam in vacuum diaphragm in vacuum diaphragm; After preloading, vacuum preloading, magnetic field and piling prepressing three carry out simultaneously, unload after reaching 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 effect in magnetic field adopts batch (-type) to carry out mode.
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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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| CN102979082B true CN102979082B (en) | 2014-10-15 |
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| CN108164114A (en) * | 2017-11-29 | 2018-06-15 | 东南大学 | A kind of device for dehydrating sladge waste and its dewatering |
| CN110514697B (en) * | 2019-08-23 | 2022-07-12 | 淮阴工学院 | Black cotton soil electroosmosis test device and test method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| JP2010222937A (en) * | 2009-03-25 | 2010-10-07 | Chikami Miltec Inc | Driving device and driving method, and searching device and searching method |
| KR101144348B1 (en) * | 2010-03-05 | 2012-05-11 | (주)나노지오이엔씨 | Drain Construction Method for Softclay Using Conductivity Drain Board |
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Patent Citations (2)
| 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 |
Non-Patent Citations (2)
| Title |
|---|
| 邓波.静磁场作用下的水的性质改变.《电子科技大学学报》.2008,第37卷(第6期),第959-962页. |
| 静磁场作用下的水的性质改变;邓波;《电子科技大学学报》;20081130;第37卷(第6期);第959-962页 * |
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