CN105649005A - Geogrid combined grouting electro-osmosis construction method for ultra-soft soil - Google Patents
Geogrid combined grouting electro-osmosis construction method for ultra-soft soil Download PDFInfo
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- CN105649005A CN105649005A CN201610052022.1A CN201610052022A CN105649005A CN 105649005 A CN105649005 A CN 105649005A CN 201610052022 A CN201610052022 A CN 201610052022A CN 105649005 A CN105649005 A CN 105649005A
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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
- E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0084—Geogrids
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a geogrid combined grouting electro-osmosis construction method for ultra-soft soil. The geogrid combined grouting electro-osmosis construction method for ultra-soft soil comprises the following steps: carrying out hydraulic reclamation of mud soil by using hydraulic reclamation construction machinery, performing reinforcement on the mud soil layer at the surface layer of the mud by using a geogrid, and paving geotextile on the surface layer; arranging grouting iron pipes as a positive electrode and a negative electrode; connecting a grouting pump and a horizontal grouting guide pipe by means of a connecting valve, and connecting the horizontal grouting guide pipe with top ends of the grouting iron pipes of the positive electrode and the negative electrode; arranging a drainage main pipe and pumping equipment in an ultra-soft soil place on one side where the cathode is arranged; and switching on the power for electro-osmosis. The geogrid combined grouting electro-osmosis construction method for ultra-soft soil is capable of changing the present situation of separation of electrodes and soil mass, effectively increasing the effective electric potential at the later stage of electro-osmosis, increasing the overall current intensity, and also correspondingly increasing the drainage rate; compared with treating ultra-soft soil by using a conventional electro-osmosis method, the integrity of the soil mass is enhanced by the geogrid, and the efficiency at the later stage of electro-osmosis is improved by the grouting technology; in addition, by means of void filling, differential settlement can also be effectively reduced.
Description
Technical field
The invention belongs to super soft ground processing technology field, particularly relate to a kind of GSZ to combine grouting and reduce space between electroosmosis electrode and the soil body and improve the drain reinforcing method of soil body globality and bearing capacity, be primarily suitable for the field of engineering technology such as coastal sludge matter soil, reclaimed ground process.
Background technology
Coastal sludge matter soil, barged-in fill water content height, poor permeability, compressibility are big, low bearing capacity and consolidation time long. Along with the demand of economy development of coastal area, the consolidation process demand of ultra-soft soil also gets more and more. Comparing other traditional processing methods, electro-osmosis method, when processing the coastal soft clay of reinforcing and barged-in fill, has significant advantage, so being used widely in coastal area.
In electric osmose practice of construction process after voltage-drop loading a period of time, bigger space between anode and the soil body, can be formed, such that the voltage that practical function is in soil body two ends is much smaller than electric power output voltage, thus the effect that strong influence electric osmose is reinforced. After electric osmose, between the soil body and electrode, crack too much can affect the globality of the soil body, and then differential settlement is obvious after causing soil stabilization to process, and finds suitable method solve the problem of soil body globality difference after electric osmose so needing badly.
In addition, GSZ technology, using muscle material as tension member, is given birth to mutual rubbing action, the lateral deformation of the restriction soil body with local products, being strengthened the globality of the soil body, thus improving the shearing strength of the soil body, being used widely in soil stabilization field. But when using in the ultra-soft soil such as blowing-filling sludge soil, it is usually with its course as construction surface, the consolidation method of precompressed is adopted after laying vertical drainage and horizontal drainage passage wherein, but only GSZ cannot carry big machinery operation, causing that this method duration is very long, consolidation effect is difficult to the time that meets and designing requirement.
Summary of the invention
It is an object of the invention to overcome drawbacks described above, consider Fill Reinforced With Geogrids method and the pluses and minuses of electro-osmosis method process soft base technique, adopt grouting technique, it is proposed to a kind of GSZ combines grouting ultra-soft soil electric osmose construction method, to improve electro-osmosis method treatment effect simultaneously.
For achieving the above object, present invention employs techniques below scheme:
A kind of GSZ combines grouting ultra-soft soil electric osmose construction method,
(1) utilizing the silt soil of Dredger Filling Engineering machinery hydraulic reclamation design height half, adopt bamboo screen frame posture GSZ, on mud top layer, soft mud is carried out reinforcement, geotextiles is laid on top layer;
(2) utilize Dredger Filling Engineering machinery hydraulic reclamation to remain the silt soil of a half height, be again with bamboo screen frame posture GSZ and on mud top layer, soft mud carried out reinforcement and lays geotextiles on top layer;
(3) lay slip casting iron pipe as anode in ultra-soft soil site side according to design pitch, lay slip casting iron pipe as negative electrode at opposite side according to design pitch;
(4) connected grouting pump and horizontal grouting conduit by connecting valve, and the slip casting iron pipe top of horizontal grouting conduit and negative electrode, anode is connected, when electrifying electrodes, slip casting iron pipe is disconnected with grouting pump;
(5) lay side laying main sewer and the pumping equipment of negative electrode at ultra-soft soil site, and the horizontal aqueduct within GSZ is connected with main sewer;
(6) with cable respectively jointed anode and negative electrode to programmable power supply case;
(7) switch on power and carry out electric osmose, when the electrode perimeter soil body occurs that whiting, cracking and electrode disengage phenomenon, temporary close power supply, the clay serosity configured is filled in the space between electrode and the soil body by connection horizontal grouting conduit and grouting pump;
(8) repeat step (7), until current reduction is after threshold value, stop electric osmose.
In described clay serosity, clay is taken from outside construction site, and moisture content is beneficial to the minimizing serosity presetting period, improves space filling effect.
Described GSZ is provided with the flexible water drainage pipe of water seepage hole, and adjacent flexible water drainage pipe interconnects composition grid.
Described power supply is DC source, according to job site soil mass property, clay concentration of slurry, it is determined that the voltage and current intensity of employing.
Described slip casting iron pipe is perpendicular to Soft Clay Foundation surface and vertically squeezes in the soil body, the degree of depth that driving depth and basement process require.
Adopting integrated welding connection technology between described horizontal grouting conduit and slip casting iron pipe, slip casting iron pipe has injected hole, injected hole interlaced arrangement ensures that clay serosity is filled fully.
Advantages of the present invention and effect are in that:
First: by adopting Fill Reinforced With Geogrids technology, the lateral deformation of the restriction soil body, strengthen the globality of the soil body, thus improving treatment effect. Moisture migration from anode to negative electrode when the horizontal drainage passage of integration is conducive to electric osmose in GSZ, is effectively improved place drainage by electroosmosis consolidation effect.
Second: by iron Grouting Pipe as electrode, after producing space between electric osmose later stage iron pipe and the soil body, the clay serosity prepared is injected slip casting iron pipe by horizontal grouting conduit and enters in the space between electrode and the soil body by injected hole, the disengagement present situation of electrode and the soil body can be improved, it is effectively improved the effective electromotive force in electric osmose later stage, overall current intensity can be made to increase, and drainage rates should also increase.
3rd: clay serosity of the present invention, the moisture content of configuration is reasonable, reduces the serosity presetting period, improves space filling effect. Clay is taken from outside construction site, utilizes field resources to reduce cost, and does not need to consider electric osmose effect and the environmental effect that additive chemical composition is brought.
4th: processing ultra-soft soil phase ratio with conventional electro-osmosis method, GSZ strengthens the globality of the soil body, and slurry injection technique improves electric osmose later stage efficiency, space is filled can also effectively reduce differential settlement.
This construction method is workable, it is simple to quality control, and it is notable that GSZ combines grouting raising electric osmose process ultra-soft soil effect.
Accompanying drawing explanation
Fig. 1 is the construction scene graph of one embodiment of the present of invention;
Fig. 2 is horizontal grouting conduit and the profile of slip casting iron pipe;
In figure: 1-ultra-soft soil site, 2-anode, 3-negative electrode, 4-suction pump, 5-programmable power supply case, 6-grouting pump, 7-clay water slurry, 8-GSZ, the horizontal aqueduct of 9-, 10-main sewer, 11-horizontal grouting conduit, 12-injected hole, 13-connecting valve.
Detailed description of the invention
The specific embodiment of the present invention is described below in conjunction with accompanying drawing. Protection scope of the present invention is not limited to the description of the present embodiment.
The present invention successively lays GSZ, the lateral deformation of the restriction soil body in blowing-filling sludge soil, strengthens the globality of the soil body, thus improving treatment effect. Hydraulic reclamation adopts electro-osmosis method that ground is carried out quick-discharging consolidation after certain altitude, compensate for and simply uses GSZ and preloading method longer problem consuming time, has ensured construction period. Anodic-cathodic adopts iron Grouting Pipe simultaneously, after producing space between electric osmose later stage iron pipe and the soil body, the clay serosity prepared is injected slip casting iron pipe by horizontal grouting conduit and enters in the space between electrode and the soil body by injected hole, effective electromotive force and the electric current in electric osmose later stage can be effectively improved, improve electric osmose effect.
Embodiment
As shown in Figure 1, 2, a kind of GSZ combines grouting ultra-soft soil electric osmose construction method, first, designs the site area needing construction according to project planning, also includes:
(1) utilizing the silt soil of Dredger Filling Engineering machinery hydraulic reclamation design height half, adopt bamboo screen frame posture GSZ 8, on mud top layer, soft mud is carried out reinforcement, geotextiles is laid on top layer;
(2) utilize Dredger Filling Engineering machinery hydraulic reclamation to remain the silt soil of a half height, be again with bamboo screen frame posture GSZ 8 and on mud top layer, soft mud carried out reinforcement and lays geotextiles on top layer;
(3) some slip casting iron pipes are laid as anode 2 in ultra-soft soil site 1 side according to design pitch, some slip casting iron pipes are laid as negative electrode 3 according to design pitch at offside, wherein electrode spacing is between 1-5m, connect electrode, negative electrode and anode slip casting iron pipe with wire to connect with a wire respectively;
(4) connected grouting pump 6 and horizontal grouting conduit 11 by connecting valve 13, and horizontal grouting conduit 11 and slip casting iron pipe top are connected, when slip casting iron pipe is energized, itself and grouting pump 6 are disconnected;
(5) lay side laying main sewer 10 and the suction pump 4 of negative electrode at ultra-soft soil site 1, and the horizontal aqueduct 9 within GSZ 8 is connected with main sewer 10;
(6) set up enclosing warning mark at construction area periphery, arrive programmable power supply case 5 with cable jointed anode 2 respectively and negative electrode 3;
(7) switch on power and carry out electric osmose, when near electrode, there are the phenomenons such as whiting, cracking and electrode disengagement in the periphery soil body, temporary close power supply, connection horizontal grouting conduit 11 and grouting pump 6, inject slip casting iron pipe by the clay serosity 7 prepared by horizontal grouting conduit 11 and pass through in the space that injected hole 12 enters between electrode and the soil body.
(8) repeat step (7), until current reduction is after certain value, stop electric osmose.
As the preferred embodiment of the present invention, the DC electric field that the present invention adopts, the difference according to characteristics such as job site soil mass property, water content, clay concentration of slurry, it is determined that the voltage and current of employing, general voltage is probably between 90-220V, and electric current is between 50-150A.
As the preferred embodiment of the present invention, described electroosmosis electrode is perpendicular to Soft Clay Foundation surface and vertically squeezes in the soil body, and iron pipe diameter used by electrode is 100mm, and concrete driving depth is exactly the degree of depth of basement process requirement.
As the preferred embodiment of the present invention, adopt integrated welding connection technology between described horizontal grouting conduit and slip casting iron pipe, slip casting iron pipe has injected hole.
As the preferred embodiment of the present invention, stagger mutually in the direction, aperture of neighbouring injected hole 12.
In sum, the present invention has the following advantages that and effect compared with existing reinforcement technique:
By adopting Fill Reinforced With Geogrids technology, the lateral deformation of the restriction soil body, strengthen the globality of the soil body, thus improving treatment effect. Moisture migration from anode to negative electrode when the horizontal drainage passage of integration is conducive to electric osmose in GSZ, is effectively improved place drainage by electroosmosis consolidation effect.
Secondly, by iron Grouting Pipe as electrode, after producing space between electric osmose later stage iron pipe and the soil body, the clay serosity prepared is injected slip casting iron pipe by horizontal grouting conduit and enters in the space between electrode and the soil body by injected hole, the disengagement present situation of electrode and the soil body can be improved, being effectively improved the effective electromotive force in electric osmose later stage, overall current intensity can be made to increase, drainage rates should also increase.
Again, processing ultra-soft soil phase ratio with conventional electro-osmosis method, GSZ strengthens the globality of the soil body, and slurry injection technique improves electric osmose later stage efficiency, and space is filled can also effectively reduce differential settlement.
Described previously is only one embodiment of the present of invention, but is not limiting as itself, the research of any this area and engineering staff, and without departing from the spirit of the invention, the change done and change, all in protection scope of the present invention.
Claims (6)
1. a GSZ combines grouting ultra-soft soil electric osmose construction method, it is characterised in that
(1) utilizing the silt soil of Dredger Filling Engineering machinery hydraulic reclamation design height half, adopt bamboo screen frame posture GSZ, on mud top layer, soft mud is carried out reinforcement, geotextiles is laid on top layer;
(2) utilize Dredger Filling Engineering machinery hydraulic reclamation to remain the silt soil of a half height, be again with bamboo screen frame posture GSZ and on mud top layer, soft mud carried out reinforcement and lays geotextiles on top layer;
(3) lay slip casting iron pipe as anode in ultra-soft soil site side according to design pitch, lay slip casting iron pipe as negative electrode at opposite side according to design pitch;
(4) connected grouting pump and horizontal grouting conduit by connecting valve, and the slip casting iron pipe top of horizontal grouting conduit and negative electrode, anode is connected, when electrifying electrodes, slip casting iron pipe is disconnected with grouting pump;
(5) lay side laying main sewer and the pumping equipment of negative electrode at ultra-soft soil site, and the horizontal aqueduct within GSZ is connected with main sewer;
(6) with cable respectively jointed anode and negative electrode to programmable power supply case;
(7) switch on power and carry out electric osmose, when the electrode perimeter soil body occurs that whiting, cracking and electrode disengage phenomenon, temporary close power supply, the clay serosity configured is filled in the space between electrode and the soil body by connection horizontal grouting conduit and grouting pump;
(8) repeat step (7), until current reduction is after threshold value, stop electric osmose.
2. method according to claim 1, it is characterised in that
In described clay serosity, clay is taken from outside construction site, and moisture content is beneficial to the minimizing serosity presetting period, improves space filling effect.
3. method according to claim 1, it is characterised in that
Described GSZ is provided with the flexible water drainage pipe of water seepage hole, and adjacent flexible water drainage pipe interconnects composition grid.
4. method according to claim 1, it is characterised in that
Described power supply is DC source, according to job site soil mass property, clay concentration of slurry, it is determined that the voltage and current intensity of employing.
5. method according to claim 1, it is characterised in that
Described slip casting iron pipe is perpendicular to Soft Clay Foundation surface and vertically squeezes in the soil body, the degree of depth that driving depth and basement process require.
6. method according to claim 1, it is characterised in that
Adopting integrated welding connection technology between described horizontal grouting conduit and slip casting iron pipe, slip casting iron pipe has injected hole, injected hole interlaced arrangement ensures that clay serosity is filled fully.
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Cited By (7)
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|---|---|---|---|---|
| CN106093348A (en) * | 2016-06-29 | 2016-11-09 | 河海大学 | Tubulose EKG layer enters formula electrochemistry slip casting reinforcing soft foundation test method and device |
| CN107882013A (en) * | 2017-12-21 | 2018-04-06 | 广东赣鸿建设有限公司 | A kind of sludge solidification device and method of vacuum injection joint resistance heating |
| CN109577122A (en) * | 2018-12-07 | 2019-04-05 | 哈尔滨工业大学 | A kind of vertical drainage road structure based on electro-osmosis method |
| CN110424449A (en) * | 2019-07-16 | 2019-11-08 | 河海大学 | A kind of microbe controlling method of reinforced earth bulkhead and its long-time stability |
| WO2020192279A1 (en) * | 2019-10-13 | 2020-10-01 | 南通大学 | Electro-osmosis strengthening method used for reinforcing soft clay foundations |
| CN113897943A (en) * | 2021-11-15 | 2022-01-07 | 江苏科技大学 | Device and method for treating soft soil foundation through electroosmosis combined grouting |
| CN115045299A (en) * | 2022-07-26 | 2022-09-13 | 杭州市西站枢纽开发有限公司 | Deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106093348A (en) * | 2016-06-29 | 2016-11-09 | 河海大学 | Tubulose EKG layer enters formula electrochemistry slip casting reinforcing soft foundation test method and device |
| CN106093348B (en) * | 2016-06-29 | 2018-07-24 | 河海大学 | EKG layers of tubulose is into formula electrochemistry slip casting reinforcing soft foundation test method and device |
| CN107882013A (en) * | 2017-12-21 | 2018-04-06 | 广东赣鸿建设有限公司 | A kind of sludge solidification device and method of vacuum injection joint resistance heating |
| CN109577122A (en) * | 2018-12-07 | 2019-04-05 | 哈尔滨工业大学 | A kind of vertical drainage road structure based on electro-osmosis method |
| CN110424449A (en) * | 2019-07-16 | 2019-11-08 | 河海大学 | A kind of microbe controlling method of reinforced earth bulkhead and its long-time stability |
| CN110424449B (en) * | 2019-07-16 | 2021-06-15 | 河海大学 | Microorganism control method for long-term stability of reinforced retaining wall |
| WO2020192279A1 (en) * | 2019-10-13 | 2020-10-01 | 南通大学 | Electro-osmosis strengthening method used for reinforcing soft clay foundations |
| CN113897943A (en) * | 2021-11-15 | 2022-01-07 | 江苏科技大学 | Device and method for treating soft soil foundation through electroosmosis combined grouting |
| CN113897943B (en) * | 2021-11-15 | 2022-07-19 | 江苏科技大学 | Device and method for treating soft soil foundation through electroosmosis combined grouting |
| CN115045299A (en) * | 2022-07-26 | 2022-09-13 | 杭州市西站枢纽开发有限公司 | Deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method |
| CN115045299B (en) * | 2022-07-26 | 2024-02-02 | 杭州市西站枢纽开发有限公司 | Deep foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method |
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