CN104805823A - Large-scale model test device for supercharged vacuum prepressing and electro-osmosis combined treatment for soft soil foundation - Google Patents
Large-scale model test device for supercharged vacuum prepressing and electro-osmosis combined treatment for soft soil foundation Download PDFInfo
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Abstract
The invention discloses a large-scale model test device for supercharged vacuum prepressing and electro-osmosis combined treatment for soft soil foundation. The test device mainly comprises a vacuum prepressing system, a supercharging system and an electro-osmosis system. The test device can be used for performing a traditional electro-osmosis solidification test or vacuum prepressing test, and can also be used for performing different types of supercharged vacuum prepressing and electro-osmosis combined treatment for soft soil foundation. By changing the depth of fill in a test chamber and the pull seam position of a circular stainless steel electrode, the test device can adapt to different foundation reinforcement depths. By changing inserting positions of a plastic drain board and a circular pull seam steel pipe, the test device can meet different supercharged vacuum prepressing and electro-osmosis combined arrangement modes. The model test device mainly has the advantages of simplicity, economical efficiency and simulation mode diversity.
Description
Technical field
The present invention relates to a kind of large-scale Soft Ground device, for simulating supercharged vacuum pre-pressed joint electric osmose soft soil foundation.
Background technology
Along with the fast development of China's Coastal Areas economy, land resources growing tension, carries out ground stabilization again and has become the Main Means alleviating shortage of land resource after land reclamation.In Deposits in Eastern Coastal China area, be extensively dispersed with thick and soft groundsill ground, bury has many disadvantageous engineering propertiess such as high-moisture, high-compressibility, high thixotropic, low shear strength.Therefore Soft Clay Foundation must carry out suitable process before carrying out engineering construction.In engineering practice, conventional method for processing foundation has preloading, vacuum method, dynamic compaction, drainage by well points method and low-yield densification method, the treatment effect of these methods to sand, silt is more satisfactory, but adopt said method to sedimentation, requirement of strength is higher and the bury of hypotonicity, high-moisture percentage, reclaimed ground and soft clay side slope process time, often there is disposal cost costliness, factory is very long, efficiency is low and treatment effect is not satisfactory etc. problem.
Electroosmotic drainage process soft soil foundation has very long history, the electrification phenomenon of clay particle was just found by this Reuss of Russia scholar Leu as far back as 1809, show after his experiment: minimum clay itself is with a certain amount of negative electrical charge, move to positive pole under electric field action, this phenomenon is called electrophoresis; Near negative pole, hydrone moves together along with aquation cation, and this phenomenon is called electric osmose.Electrophoresis, electroosmosis are simultaneous, are referred to as electrokinetic phenomena.Electrokinetic phenomena can be used for consolidation of soft clay foundation, weak soil water content is reduced, and intensity improves, and compares the processing method that other are traditional, when process has the barged-in fill of the characteristics such as fine grained, low bearing capacity, hypotonicity, high-moisture, high-compressibility, electroosmotic drainage has significant advantage.
But, the problem such as separately also have that processing cost is high, electrode is perishable with electroosmotic drainage soft soil foundation and post-processed efficiency is low.Because vacuum preloading has similar reinforcement mechanism with electric osmose to the soil body, two kinds of methods all can not make the soil body produce shear failure in loading procedure.Follow-uply just develop vacuum preloading-electric osmose combination method step by step, when water content of soil is larger in early days, most Free water in soil can be discharged fast by vacuum method, but along with the reduction of water content, the treatment effect of vacuum preloading obviously reduces; When the later stage, water content of soil was less, the water content in the soil body just can be reduced further with the precompressed of electric osmose combined vacuum.Vacuum preloading is combined with electric osmose, not only increases Foundation Treatment Effect, also significantly reduce time and the cost of basement process, so vacuum preloading-electro-osmosis method just to become in Soft Ground comparatively effectively and one of the method for future.
Supercharged vacuum preloading, by plugging pressure inlet between plastic draining board, after conventional vacuum preconsolidation degree reaches 40%, connects pressure inlet to booster pump, increases the positive air pressure at soil body center, increase the pressure differential of soil body center and band drain.Supercharged vacuum precompressed alleviates the problem of vacuum preloading later stage drainage efficiency weakness, shortens the processing time of vacuum preloading.In addition, also the pressure inlet mouth of pipe can be opened wide, make pressure inlet emptying, allow deep soil directly be communicated with air, pressure differential when this technology also can increase vacuum preloading process between soil body center and band drain, accelerates drainage rates and compares traditional vacuum precompressed engineering method and can improve Foundation Treatment Effect further.Therefore, supercharged vacuum precompressed is the important development direction of following vacuum method, be badly in need of a kind of experimental rig using supercharged vacuum pre-pressed joint electric osmose soft soil foundation in the convenient and swift simulation Practical Project of indoor energy, so that the novel foundation process engineering method that research can be cost-saving again while improving treatment effect.
Before making the present invention, the problems such as consolidation by electroosmosis experimental rig often exists undersized, and arrangement of electrodes form is single.On the one hand, the operating mode that can simulate of such experimental rig is very few and fully can not reflect engineering practice; On the other hand, electroosmotic drainage and vacuum method or supercharged vacuum preloading can not combine by such experimental rig.Therefore, need a kind of large-scale experimental rig to simulate supercharged vacuum precompressed and electric osmose Combined Treatment soft foundation, to simulate the arrangement of different supercharged vacuum pre-pressed joint electric osmoses, reflect engineering practice better, draw the actual result of the test having directive significance of engineering
Summary of the invention
The invention provides a kind of full-scale model test device of supercharged vacuum pre-pressed joint electric osmose soft soil foundation.Main innovation is be simulated supercharged vacuum pre-pressed joint electric osmose soft soil foundation in indoor easily by this large-scale experiment device.Electroosmosis electrode and pressure inlet unite two into one by the present invention, stainless steel draws seam steel pipe to serve as electroosmosis electrode, be combined with plastics pressure inlet if desired and can be used for the technique such as supercharging and venting, and the simulation to different associated form can be realized by the setting of each parameter of experimental rig.By changing the depth of fill, experimental rig can simulate the different ground degree of depth; By changing electrode material and size, experimental rig can simulate the electric osmose soft soil foundation of different electrode materials and size; Draw the position of seam by changing circular stainless-steel pipe, experimental rig can simulate the supercharging of supercharged vacuum precompressed different depth; By changing plastic draining board and circular position of drawing seam steel pipe to insert, experimental rig can simulate the arrangement of different supercharged vacuum pre-pressed joint electric osmoses, such as rectangular arrangement, circular arrangement, blossom type layout, parallel misalignment type layout etc.
Accompanying drawing explanation
Fig. 1 is overall schematic of the present invention.
Fig. 2 is main body mould molding box schematic diagram of the present invention.
Fig. 3 is rectangular electrode arrangement diagram of the present invention.
Fig. 4 is parallel misalignment shape electrode arrangement of the present invention.
In figure: 1, tempered glass model casing 2, scale 3, draining valve 4, steel base 5, roller 6, circle draw seam steel pipe 7, plastic draining board 8, diaphragm seal 9, hand-type joint 10, plastics wired hose 11, tee junction 12, bottle,suction 13, vacuum meter 14, plastic vacuum pipe 15, vacuum pump 16, electronic balance 17, plastics pressure inlet 18, pneumatic joint 19, booster pump 20, wire 21, external dc source
Detailed description of the invention
Below in conjunction with accompanying drawing and example, the present invention is described further:
As shown in Figure 1 and Figure 2, the full-scale model test device of supercharged vacuum pre-pressed joint electric osmose soft soil foundation is formed primarily of electric osmose system, pumped vacuum systems, pressurization system; Tempered glass model casing 1 is placed on bottom and is equipped with on the steel base 5 of roller 6; Article two, scale 2 is pasted onto the two ends, left and right in tempered glass front respectively; Three rows totally nine draining valves 3 are arranged on centre bottom tempered glass case 1 and two ends; Circle is directly inserted in soil after drawing seam steel pipe 6 to wait to banket as electroosmosis electrode; The circle that plastic draining board 7 is plugged in as electric osmose negative electrode is drawn near seam steel pipe 6; Diaphragm seal 8 is laid in soil body surface, and surrounding does the process of pressure ditch; Plastic draining board 7 is connected to bottle,suction 12 by hand-type joint 9, plastics wired hose, tee junction 11; Vacuum meter 13 is arranged on the bottle stopper of bottle,suction 12; Bottle,suction 12 is connected to vacuum pump 15 by plastic vacuum pipe 14; The quality of bottle,suction 12 is weighed by electronic balance 16; When circle draws seam steel pipe 6 as electric osmose anode, open top is connected to booster pump 19 by plastics pressure inlet 17, pneumatic joint 18, the mouth of pipe does encapsulation process, and pipe shaft top is connected to the positive pole of external dc source 21 by wire 20, makes it take into account the double action of electric osmose anode and pressure inlet; When circle draws seam steel pipe 6 as electric osmose negative electrode, mouth of pipe sealant tape is sealed and is connected to the negative pole of external dc source 21 by wire 20.
Specific implementation process is as follows:
As shown in Figure 1, Figure 2, Figure 3, Figure 4, tempered glass model casing 1 being placed on bottom is equipped with on the steel base 5 of roller 6; Close the draining valve 3 bottom tempered glass model casing 1; Soil sample layering is filled to 50cm high; For rectangular arrangement, circle drawn with inserting in soil the rectangular arrangement forming grading electrode both sides negative electrode after rubber belt sealing bottom seam steel pipe 6, the mouth of pipe exposes soil layer surface 10cm; Insertion plastic draining board 7 near seam steel pipe 6 is drawn near the circle as negative electrode at model casing center line; Lay diaphragm seal 8 on soil layer surface, surrounding carries out the process of pressure ditch, and the place adhesive tape that diaphragm seal 8 destroys and glass cement are repaired, and avoid gas leakage; Plastic draining board 7 is connected to bottle,suction 12 by hand-type joint 9, plastics wired hose, tee junction 11; Punch at the bottle stopper place of bottle,suction 12, vacuum meter 13 is installed on bottle stopper, carry out encapsulation process with unsintered tape and fluid sealant; Bottle,suction 12 is connected to vacuum pump 15 by plastic vacuum pipe 14; Draw the mouth of pipe of seam steel pipe 6 to insert plastics pressure inlet 17 in the circle as electric osmose anode, the mouth of pipe carries out rubber belt sealing process; Seam steel pipe 6 is drawn to be connected to booster pump 19 by plastics pressure inlet 17, pneumatic joint 18 each circle as electric osmose anode; Draw seam steel pipe 6 to be connected to external dc source 21 according to the wire 20 that is arranged through of electroosmosis electrode each circle, form closed-loop path, the mouth of pipe carries out rubber belt sealing process.
After on-test, first carry out vacuum preloading draining, open vacuum pump 15, monitoring vacuum meter 13 is to ensure about the 85kPa that vacuum maintains; The water yield in bottle,suction 12 measured by timing electronic balance 16; After water yield reduces, the effect of conventional vacuum precompressed reduces gradually, and now open booster pump 19 and carry out supercharged vacuum precompressed, period vacuumizes dead load; After the vacuum of display in vacuum meter 13 is reduced to 45Kpa, for avoiding vacuum in soil too low, now terminate supercharging; The cycle of supercharging can according to test effect sets itself; Be reduced to after 50ml per hour until water yield, the effect of supercharged vacuum precompressed also reduces gradually, now opens external dc source 21, carries out electric osmose-supercharged vacuum pre-pressed joint draining; When water yield is reduced to about 5ml per hour, for saving electric energy, now can terminate test; Remove diaphragm seal 8, reclaim circle and draw seam steel pipe 6, plastics wired hose 9, plastics pressure inlet 17 and wire 20.
Claims (6)
1. a full-scale model test device for supercharged vacuum pre-pressed joint electric osmose soft soil foundation, is characterized in that: experimental rig is by vacuum prepressing system, pressurization system, electric osmose System's composition; Vacuum prepressing system is primarily of plastic draining board, hand-type joint, plastics wired hose, tee junction, bottle,suction, vacuum meter, vacuum pump composition; Pressurization system draws seam steel pipe, plastics pressure inlet, pneumatic joint, booster pump composition primarily of circle; Electric osmose system draws seam steel pipe, wire, external dc source composition primarily of circle; The different ground stabilization degree of depth can be simulated by changing the depth of fill in chamber; By changing plastic draining board and the circular arrangement form drawing the position of seam steel pipe can meet different supercharged vacuum pre-pressed joint electric osmoses.
2. experimental rig according to claim 1, is characterized in that: the plastics pressure inlet in described pressurization system inserts circle to draw in seam steel pipe, makes circle draw seam steel pipe to take into account the double action of pressure inlet in electric osmose system Anodic and pressurization system.
3. experimental rig according to claim 1, is characterized in that: described electric osmose system, can realize the technology such as intermittently power-on, multistage loadings voltage and electrode reversion by controlling external dc source.
4. experimental rig according to claim 1, is characterized in that: described pressurization system, and the position of inserting by changing plastics pressure inlets coordinates electrode to reverse can realize reverse supercharging technology, make soil body process evenly.
5. experimental rig according to claim 1, is characterized in that: tempered glass model casing is placed on bottom and is equipped with on the steel base of roller; Article two, scale is pasted onto the two ends, left and right in tempered glass front respectively; Three rows totally nine draining valves are arranged on centre bottom tempered glass case and two ends; Circle is directly inserted in soil after drawing seam steel pipe to wait to banket as electroosmosis electrode; The circle that plastic draining board is plugged in as electric osmose negative electrode is drawn near seam steel pipe; Diaphragm seal is laid in soil body surface, and surrounding does the process of pressure ditch; Plastic draining board is connected to bottle,suction by hand-type joint, plastics wired hose, tee junction; Vacuum meter is arranged on the bottle stopper of bottle,suction; Bottle,suction is connected to vacuum pump by plastic vacuum pipe; The quality of bottle,suction passes through electronic balance weighing; When circle draws seam steel pipe as electric osmose anode, open top is connected to booster pump by plastics pressure inlet, pneumatic joint, the mouth of pipe does encapsulation process, and pipe shaft top is connected to the positive pole of external dc source by wire, makes it take into account the double action of electric osmose anode and pressure inlet; When circle draws seam steel pipe as electric osmose negative electrode, mouth of pipe sealant tape is sealed and is connected to the negative pole of external dc source 21 by wire.
6. adopt experimental rig according to claim 1 to carry out the method tested, it is characterized in that:
Tempered glass model casing being placed on bottom is equipped with on the steel base of roller; Close the draining valve bottom tempered glass model casing; Soil sample layering is filled to 50cm high; For rectangular arrangement, circle drawn with inserting in soil the rectangular arrangement forming grading electrode both sides negative electrode after rubber belt sealing bottom seam steel pipe, the mouth of pipe exposes soil layer surface 10cm; Draw near seam steel pipe in the close circle as negative electrode of model casing center line and insert plastic draining board; Lay diaphragm seal on soil layer surface, surrounding carries out the process of pressure ditch, and the place adhesive tape that diaphragm seal destroys and glass cement are repaired, and avoid gas leakage; Plastic draining board is connected to bottle,suction by hand-type joint, plastics wired hose, tee junction; Punch at the bottle stopper place of bottle,suction, vacuum meter is installed on bottle stopper, carry out encapsulation process with unsintered tape and fluid sealant; Bottle,suction is connected to vacuum pump by plastic vacuum pipe; Draw the mouth of pipe of seam steel pipe to insert plastics pressure inlet in the circle as electric osmose anode, the mouth of pipe carries out rubber belt sealing process; Seam steel pipe is drawn to be connected to booster pump by plastics pressure inlet, pneumatic joint each circle as electric osmose anode; Draw seam steel pipe to be connected to external dc source according to the wire that is arranged through of electroosmosis electrode each circle, form closed-loop path, the mouth of pipe carries out rubber belt sealing process;
After on-test, first carry out vacuum preloading draining, open vacuum pump, monitoring vacuum meter is to ensure about the 85kPa that vacuum maintains; The water yield in bottle,suction measured by timing electronic balance rice; After water yield reduces, open booster pump and carry out supercharged vacuum precompressed, period vacuumizes dead load; After the vacuum shown in vacuum meter is reduced to 45Kpa, terminate supercharging; The cycle of supercharging can according to test effect sets itself; Be reduced to after 50ml per hour until water yield, open external dc source, carry out electric osmose-supercharged vacuum pre-pressed joint draining; When water yield is reduced to about 5ml per hour, off-test; Remove diaphragm seal, reclaim circle and draw seam steel pipe, plastics wired hose, plastics pressure inlet and wire.
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| CN108287228A (en) * | 2018-01-31 | 2018-07-17 | 浙江大学 | A kind of device of research electric osmose combined vacuum precompressed deep soil Foundation Treatment Effect |
| CN109342292A (en) * | 2018-11-16 | 2019-02-15 | 吉林大学 | A kind of classification vacuum preloading simulating lab test device |
| CN109883851A (en) * | 2019-04-03 | 2019-06-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Gas injection-vacuum consolidation testing device and test method for high-moisture percentage mud |
| CN110596110A (en) * | 2019-10-10 | 2019-12-20 | 南京林业大学 | Measuring device and testing method for comparing electroosmosis viscosity reduction effect under local discontinuous state of soil body |
| CN112683745A (en) * | 2020-11-18 | 2021-04-20 | 江苏科技大学 | Heat-force-electroosmosis multi-field coupling soft soil consolidation test box |
| CN114813375A (en) * | 2022-04-22 | 2022-07-29 | 河海大学 | Test device for simulating electroosmosis to reduce pile-soil friction mechanism |
| CN114397428B (en) * | 2022-01-17 | 2023-04-14 | 甘肃省水利水电勘测设计研究院有限责任公司 | Electroosmosis drainage combined electrode anchoring improved loess slope model test device |
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| CN110596110B (en) * | 2019-10-10 | 2023-09-22 | 南京林业大学 | Measuring device and testing method for comparing electroosmosis viscosity reduction effect under local discontinuous state of soil body |
| CN112683745A (en) * | 2020-11-18 | 2021-04-20 | 江苏科技大学 | Heat-force-electroosmosis multi-field coupling soft soil consolidation test box |
| CN114397428B (en) * | 2022-01-17 | 2023-04-14 | 甘肃省水利水电勘测设计研究院有限责任公司 | Electroosmosis drainage combined electrode anchoring improved loess slope model test device |
| CN114813375A (en) * | 2022-04-22 | 2022-07-29 | 河海大学 | Test device for simulating electroosmosis to reduce pile-soil friction mechanism |
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