CN101139833A - Compound vacuum precompressed soft foundation comprehensive strengthening method - Google Patents
Compound vacuum precompressed soft foundation comprehensive strengthening method Download PDFInfo
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- CN101139833A CN101139833A CNA200710025252XA CN200710025252A CN101139833A CN 101139833 A CN101139833 A CN 101139833A CN A200710025252X A CNA200710025252X A CN A200710025252XA CN 200710025252 A CN200710025252 A CN 200710025252A CN 101139833 A CN101139833 A CN 101139833A
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Abstract
The invention discloses a composite vacuum pre-stressed soft foundation comprehensive reinforcement method, which is characterized in that: the construction method comprises a vacuum pre-stressed precipitation and an electroosmotic precipitation. The execution steps are that: a) Establishing a yard drainage system; b) Perform vacuum pre-stressed precipitation; c) Performing electroosmotic precipitation at the same time of step b), or when water output is lowered in step b; d) When degree of consolidation reaches a level higher than or equal to 85 percent, steps b) and c) are over to enter a low-energy forced ramming; e) Performing vibration steamroll to flatten the yard. Through composition of utilization of the two construction methods of the vacuum pre-stressed and electroosmotic precipitations, the invention retains advantages in prior vacuum pre-stressed construction methods. Meanwhile, in combination with the electroosmotic precipitation, the invention fulfills application of the vacuum pre-stressed construction method in sludge-like (low permeation factor) soft earth foundations, so that the reinforcement depth of the soft earth layer can be increased, and the construction period can be shortened.
Description
Technical field
The present invention relates to a kind of foundation reinforcement method, be specifically related to a kind of foundation reinforcement method of large tracts of land deep layer weak soil, be applicable to stream mud, mud, mucky soil ground, be particularly useful for the place to bearing capacity the high but reinforced soft soil ground general to deformation requirements.
Background technology
Vacuum preloading is as a kind of large tracts of land reinforcing soft foundation technology, this worker's method is low because of its construction costs, consolidation effect is good, after the eighties, begin to use in China, its basic skills is: plastic draining board is set as the vertical drainage passage in the soft foundation that needs reinforcement, be engaged in the sand cushion of laying on the ground, the horizontal drainage passage that netted draining chimney filter is formed, and cover air-locked diaphragm seal thereon, by being embedded in the water absorption channel in the sand cushion, adopting vacuum plant to bleed, and air in the ground in the film is discharged through film device, make in the film, draught head of outer generation, this draught head is exactly the load that acts on the ground.Along with constantly being discharged from of air in the film, draught head increases gradually, and the water in the ground, gas constantly are discharged from and make the ground generation fixed, thereby improves the intensity of soft foundation.The soil body can not produce shear stress during vacuum preloading, adds up even the vacuum load is disposable, and foundation soil shear failure can not take place yet.The ground that is inserted with plastic draining board is vacuumized, if the supposition negative pressure is not lost by plastic draining board, then negative pressure all works in the plastic draining board depth bounds, almost becomes distributed rectangular, so it is effective to hold one's breath, and the vacuum height, consolidation effect is good.Under the situation that produces the same vertical distortion, the consolidation effect of vacuum method is better than additive method.
But this worker's method also has some shortcomings, so that has limited the promotion and application of this worker's method to a certain extent, and its major defect is as follows:
1, vacuum preloading generally is used for reinforcing soft ground, and the transmission coefficient of weak soil is lower, under the situation that vertical drainage body is not set, and the poor effect of reinforcing, at the very high ground of transmission coefficient, vacuum preloading does not have due consolidation effect equally.According to mechanism of vacuum preloading, when stabilization zone foundation soil transmission coefficient is bigger, and under the less situation of stabilization zone surrounding soil transmission coefficient, vacuum pre-press reinforcing just can be obtained effect preferably.Generally there is not such situation in natural ground.To inserting the vacuum preloading ground of plastic draining board, be provided with the drainage exhaust passage after, also only to transmission coefficient 〉=10
-5Work in the place of cm/s, the littler mud of transmission coefficient fixed do not had effect;
2, vacuum preloading needs to lay the 500mm sand cushion on ground, as the transverse row water layer, but when practice of construction, on grounds such as mud, owing to plant equipment can't be marched into the arena, and can't realize;
3, the bearing capacity of vacuum preloading is also not high, only can reach 80kPa, can't satisfy the requirement of building to bearing capacity;
4, because the restriction of factor such as equipment, required chronic of traditional vacuum precompressed needs 3 months or longer.
The existence of above shortcoming has all limited expansion and the application of vacuum preloading worker method in engineering.
Summary of the invention
The object of the invention provides a kind of compound vacuum precompressed soft foundation comprehensive strengthening method, use this compound worker's method, both kept the advantage of vacuum preloading worker method, and made it be applicable to reinforcing, and made the ground after the reinforcing have higher capacity the lower weak soil of transmission coefficient.
For achieving the above object, the technical solution used in the present invention is: a kind of compound vacuum precompressed soft foundation comprehensive strengthening method, and this worker's method comprises vacuum preloading precipitation and electroosmosis dewatering, its construction sequence is as follows:
A) set up the yard drain system, and arrange the vacuum electroosmosis device;
B) carry out vacuum preloading precipitation;
C) when carrying out step b) maybe the water flow in carrying out step b) be reduced to initial flow below 1/5 after, open circuit, carry out electroosmosis dewatering;
D) when the degree of consolidation reach 〉=85% the time, step b), c) finish, remove the vacuum electroosmosis device, carry out low-energy strong-ramming;
E) vibroroller cmpacting, smooth place.
In above-mentioned worker's method, adopt vacuum preloading of the prior art and electroosmosis dewatering method linked together, plastic draining board and positive and negative electrode are inserted in ground on the scene, vacuum prepressing device is installed, connects positive and negative electrode, last covering vacuum film, vacuum preloading precipitation begins, and the draught head that utilizes vacuum diaphragm and atmosphere is as the load on the ground, water in the ground, gas are constantly discharged along the drainage system of having set up, and it is fixed that ground is taken place; In the time of vacuum preloading or treat water yield obviously reduce the back (can save electric consumption), open circuit, electroosmosis dewatering begins, hydrone is discharged along drainage system by vacuumizing; Treat that the vacuum electroosmosis joint preloading finishes back (degree of consolidation reach 〉=) at 85% o'clock, pull out the positive and negative electrode that electroosmosis dewatering is used, upper berth, place Moveable packings or earth bag filler carry out low-energy strong-ramming, soil layer in the shallow-layer scope of place is reinforced accordingly, carries out vibroroller cmpacting, smooth place at last.When adopting electroosmosis dewatering, the transmission coefficient in weak soil place can improve about 100 times, on the one hand, makes the vacuum preloading worker method also can be at transmission coefficient 10
-6～10
-7Mud (not containing sand) earthen foundation use in reinforcing, on the other hand, accelerated the consolidation time of vacuum preloading.
In the technique scheme, after described step e), on smooth place, lay plural layer geotechnique bag, and every lamination is real, spread behind one deck with bobbing machine compacting geotechnique bag, after whole the shop, the load application compacting.
Further technical scheme is, described geotechnique's bag is connected respectively with the adjacent corresponding bight of geotechnique's bag of layer for four jiaos, and the earth bag of neighbouring two interlayers is staggered stack.
Above, lay geotechnique's bag on the place after smooth, applying geotechnique's bag behind the prestressing force, to have improved the soil property that low-energy strong-ramming brings inhomogeneous, improved the bearing capacity in place apace, simultaneously can adjust the complicated load that superstructure transmits, and evenly down decay apace.
In the technique scheme, described low-energy strong-ramming carries out 3 times at least, and the tamping energy of first pass low-energy strong-ramming is got 900～1200KNm, spacing 4.5～7m, quincuncial arrangement, every clicks 2～4 is hit, when last two hit the injection amount less than 100mm, the first pass low-energy strong-ramming finished; The tamping energy of second time low-energy strong-ramming is got 1200～1800KNm, spacing 4.5～7m, and quincuncial arrangement, every clicks 2～4 is hit; The 3rd time low-energy strong-ramming rams for full, rams seal overlap joint 1/3, and every clicks 1～2 is hit.
In the technique scheme, described drainage system comprises horizontal drainage system and vertical drainage system, and described horizontal drainage system is made up of weeper drain, horizontal vacuum pipe and collecting well, and described vertical drainage system is made up of plastic draining board and positive and negative electrode.
Further technology is, described positive and negative electrode adopts aluminum pipe or copper pipe, and electric conductivity is good, electric current can be imported the weak soil deep layer, makes the better effects if of electroosmosis dewatering in the weak soil deep layer.
Reinforcing principle of the present invention:
A, place weak soil are behind vacuum preloading, and groundwater table reduces, and the bottom weak soil is under the precipitating, pre-pressing load action, and excess pore water pressure increases, and with the dissipation of work excess pore water pressure, the bottom weak soil obtains tentatively fixed;
B, under the vacuum preloading electroosmosis dewatering, weak soil in the plastic draining board scope, under the acting in conjunction of negative pressure of vacuum, electrophoresis (oozing), baking, most pore water is discharged through plastic draining board, under the vacuum preloading effect, the water content of weak soil descends rapidly, in the precompressed process, the increment of effective stress is that each is to equating, shear stress does not increase, and can not cause the shear failure of the soil body, can be evacuated to maximum vacuum continuously, thereby shortened time of precompressed, waiting the gain in strength that under stress increment, makes soil along with the fixed of soil.Under the electroosmosis dewatering effect, the water content in the weak soil descends, thereby greatly reduces because of the strong probability that " spongy soil " occur that rams, and for the low-energy strong-ramming of next round has been created condition, also can strengthen tamping energy simultaneously;
Behind c, the vacuum preloading electroosmosis dewatering, the water content of place weak soil is reduced near the plastic limit, the tamping energy of low-energy strong-ramming can be strengthened, the place weak soil will excite very big excess pore water pressure under the tamping energy effect after the increasing, with the dissipation of work excess pore water pressure, the bottom weak soil obtains fixed once more;
D, weak soil place are after above-mentioned processing, bearing capacity reaches 80～150Kpa, lay earth bag thereon, earth bag is applied external force, after earth bag flattened, the soil body in the earth bag was cut bloated, produced tension force in the sack, sack tension force makes the contact force N between soil particle increase, and the intensity of soil increases (frictional force F=uN) thereupon.Behind the place mat through the multilayer earth bag, bearing capacity can reach more than the 200Kpa on it.
Because the technique scheme utilization, the present invention compared with prior art has following advantage:
1. the present invention uses the combination of vacuum preloading and electroosmosis dewatering, after utilizing electroosmosis dewatering, strengthened the transmission coefficient of reinforcing in the scope of place (can improve about 100 times) greatly, made the very little muck foundation of transmission coefficient that can not adopt the vacuum preloading method originally can be suitable for the vacuum preloading method;
2. adopt vacuum preloading and electroosmosis dewatering United Technologies, owing to spread vacuum diaphragm, played insulating effect simultaneously, can adopt higher voltage (more than the 70V, in the past, using the 36V safe voltage) for avoiding Danger Electric shock risk, add that positive and negative electrode can adopt good aluminum pipe of electric conductivity or copper pipe, electric current can import the weak soil deep layer, and the effect of electroosmosis dewatering is improved, and the effective depth of handling weak soil can reach 17m;
3. adopt vacuum preloading and electroosmosis dewatering United Technologies,, shortened the consolidation time (pumpdown time was at 20～35 days) of weak soil greatly because the effect of electric osmose power is compared with independent employing vacuum preloading; And on the other hand, owing to laid diaphragm seal on the place, the place is significantly reduced by the factor of weather effect, has guaranteed dewatering effect;
The place strong ram finish after, the above bearing capacity of 6m can reach 100～150kPa, again through earth bag change fill out after, more than the surface bears Li Keda 200kPa, thereby plant equipment can directly enter on the place, improves efficiency of construction greatly.
Description of drawings
Fig. 1 is the construction soil layer cross-sectional schematic of the embodiment of the invention one.
Wherein: 1, plastic draining board; 2, diaphragm seal; 3, positive and negative electrode; 4, horizontal vacuum pipe; 5, vacuum pump.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment one: referring to shown in Figure 1, and a kind of compound vacuum precompressed soft foundation comprehensive strengthening method, this worker's method comprises vacuum preloading precipitation and electroosmosis dewatering two parts, its construction sequence is as follows:
A) the yard drain system is set up in smooth place; Comprise horizontal drainage system and vertical drainage system, described horizontal drainage system is made up of weeper drain, horizontal vacuum pipe 4 and collecting well, and described vertical drainage system is made up of plastic draining board and positive and negative electrode 2.
On the place of handling, insert plastic draining board 1, plastic draining distance between plates 1m * 1m, quincuncial arrangement, plastic draining board must be selected the high performance plastics band drain for use, guarantee the unimpeded required mechanical strength of vacuum, filter membrane adopts the high geotextiles of hot strength, guarantees that the vacuum system draining is unimpeded; Insert positive and negative electrode, require to conduct electricity very well, routine aluminium bar or copper rod etc., the same plastic draining board of the degree of depth, minimum spacing can adopt 1.73m * 2m;
The electric osmose device is installed, its energising situation of test under safe voltage, the vacuum level pipe directly is connected with plastic draining board, after finishing, construction seals with the sealing material, want strict sealing during installation, must not leak gas, flap valve and gate valve are set in the vacuum road, avoid the very fast reduction of vacuum in the film, and be used for controlling and intermittently bleed and keep the stable of vacuum;
Lay the PVC composite geo-membrane, the sealing film is combined into a monoblock plastic foil greater than processing area at the scene, after the first floor plastic foil has been laid, should check whether seam crossing has gas leakage, and in time repair, with spreading with using the earth bag press mold, the film that will complete that prevents to blow sweeps away or tears in the membrane process of shop, forbids that the constructor the hard end footwear operation or walking on film, in case film is scratched, when the shop film is finished, a spot of vacuum pump is installed is carried out work, the film that lays is held.
B) vacuum preloading precipitation, vacuum pump 5 is bled, and makes draught head of the inside and outside generation of film, and this draught head is exactly the load that acts on the ground.Along with constantly being discharged from of air in the film, draught head increases gradually, and the water in the ground, gas constantly are discharged from and make the ground generation fixed.
C) after the water yield at vacuum preloading precipitation obviously reduces (be often referred to water flow and be reduced to below 1/5 of initial flow), open circuit, carry out electroosmosis dewatering; After, open circuit, carry out electroosmosis dewatering, hydrone is discharged along plastic draining board by vacuumizing.
D) when the degree of consolidation greater than 85%, vacuum is greater than 80kPa in the band drain, vacuum preloading and electroosmosis dewatering finish, and after positive and negative electrode is pulled out, carry out low-energy strong-ramming 3 times, the tamping energy of first pass low-energy strong-ramming is got 900～1200KNm, spacing 4.5～7m, quincuncial arrangement, every clicks 2～4 is hit, when last two hit the injection amount less than 100mm, the first pass low-energy strong-ramming finished; The tamping energy of second time low-energy strong-ramming is got 1200～1800KNm, spacing 4.5～7m, and quincuncial arrangement, every clicks 2～4 is hit; The 3rd time low-energy strong-ramming rams for full, rams seal overlap joint 1/3, and every clicks 1～2 is hit.
E) vibroroller cmpacting, smooth place.
F) several layers in upper berth, the place geotechnique's bag that finishes in smooth place, geotechnological bag four jiaos are connected with the geotechnique bag corresponding bight that layer is adjacent together respectively, and the earth bag of neighbouring two interlayers is staggered stack, after every layer of laying is smooth, uses the bobbing machine compacting.
Claims (6)
1. compound vacuum precompressed soft foundation comprehensive strengthening method, it is characterized in that: this worker's method comprises vacuum preloading precipitation and electroosmosis dewatering, and its construction sequence is as follows:
A) set up the yard drain system, and arrange the vacuum electroosmosis device;
B) carry out vacuum preloading precipitation;
C) when carrying out step b) maybe the water flow in carrying out step b) be reduced to initial flow below 1/5 after, open circuit, carry out electroosmosis dewatering;
D) when the degree of consolidation reach 〉=85% the time, step b), c) finish, remove the vacuum electroosmosis device, carry out low-energy strong-ramming;
E) vibroroller cmpacting, smooth place.
2. compound vacuum precompressed soft foundation comprehensive strengthening method according to claim 1 is characterized in that: after described step e), lay plural layer geotechnique bag on smooth place, and every lamination is real.
3. compound vacuum precompressed soft foundation comprehensive strengthening method according to claim 2 is characterized in that: described geotechnique's bag is connected respectively with the adjacent corresponding bight of geotechnique's bag of layer for four jiaos, and the earth bag of neighbouring two interlayers is staggered stack.
4. compound vacuum precompressed soft foundation comprehensive strengthening method according to claim 1, it is characterized in that: described low-energy strong-ramming carries out 3 times at least, the tamping energy of first pass low-energy strong-ramming is got 900～1200KNm, spacing 4.5～7m, quincuncial arrangement, every clicks 2～4 is hit, and when last two hit the injection amount less than 100mm, the first pass low-energy strong-ramming finished; The tamping energy of second time low-energy strong-ramming is got 1200～1800KNm, spacing 4.5～7m, and quincuncial arrangement, every clicks 2～4 is hit; The 3rd time low-energy strong-ramming rams for full, rams seal overlap joint 1/3, and every clicks 1～2 is hit.
5. compound vacuum precompressed soft foundation comprehensive strengthening method according to claim 1, it is characterized in that: described drainage system comprises horizontal drainage system and vertical drainage system, described horizontal drainage system is made up of weeper drain, horizontal vacuum pipe and collecting well, and described vertical drainage system is made up of plastic draining board and positive and negative electrode.
6. compound vacuum precompressed soft foundation comprehensive strengthening method according to claim 2 is characterized in that: described positive and negative electrode adopts aluminum pipe or copper pipe.
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| CNA200710025252XA CN101139833A (en) | 2007-07-20 | 2007-07-20 | Compound vacuum precompressed soft foundation comprehensive strengthening method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010081375A1 (en) * | 2009-01-16 | 2010-07-22 | 上海港湾软地基处理工程(集团)有限公司 | Presetting type high vacuum compact method for treating soft ground |
| CN101824819A (en) * | 2010-04-27 | 2010-09-08 | 天津大学 | Method for stabilizing foundation based on electro-osmosis technique and bucket foundation negative pressure technique |
| CN101871209A (en) * | 2010-07-07 | 2010-10-27 | 广州市盛洲地基基础工程有限公司 | Vacuum preloading method without sealing film |
| CN101871210B (en) * | 2009-04-23 | 2012-01-25 | 中国二十冶集团有限公司 | Electro-osmotic drainage method in construction of large-area deep foundation pit in sludge region with high water ratio |
| CN102720182A (en) * | 2012-06-15 | 2012-10-10 | 武汉大学 | Conductive plastic drain board |
| CN102817355A (en) * | 2012-09-10 | 2012-12-12 | 王军 | Simple reinforcing method of vacuum electroosmosis combined prepressing soft soil foundation |
| CN102900067A (en) * | 2012-10-31 | 2013-01-30 | 上海大学 | Processing method for reinforcing soft clay ground through vacuum preloading in combination with electro-osmosis method |
| CN102979082A (en) * | 2012-12-27 | 2013-03-20 | 大连理工大学 | Method for consolidating soft soil foundation by using vacuum and magnetic field compound preloading |
| CN108221949A (en) * | 2018-02-02 | 2018-06-29 | 上海港湾基础建设（集团）股份有限公司 | Double glue mend film device and method to a kind of vacuum preloading under water |
| CN111562288A (en) * | 2020-07-08 | 2020-08-21 | 中建四局第三建设有限公司 | In-situ test evaluation method for sludge solidification |
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2007
- 2007-07-20 CN CNA200710025252XA patent/CN101139833A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010081375A1 (en) * | 2009-01-16 | 2010-07-22 | 上海港湾软地基处理工程(集团)有限公司 | Presetting type high vacuum compact method for treating soft ground |
| CN101871210B (en) * | 2009-04-23 | 2012-01-25 | 中国二十冶集团有限公司 | Electro-osmotic drainage method in construction of large-area deep foundation pit in sludge region with high water ratio |
| CN101824819A (en) * | 2010-04-27 | 2010-09-08 | 天津大学 | Method for stabilizing foundation based on electro-osmosis technique and bucket foundation negative pressure technique |
| CN101871209A (en) * | 2010-07-07 | 2010-10-27 | 广州市盛洲地基基础工程有限公司 | Vacuum preloading method without sealing film |
| CN102720182B (en) * | 2012-06-15 | 2014-09-17 | 武汉大学 | Conductive plastic drain board |
| CN102720182A (en) * | 2012-06-15 | 2012-10-10 | 武汉大学 | Conductive plastic drain board |
| CN102817355A (en) * | 2012-09-10 | 2012-12-12 | 王军 | Simple reinforcing method of vacuum electroosmosis combined prepressing soft soil foundation |
| CN102817355B (en) * | 2012-09-10 | 2014-11-26 | 温州大学 | Simple reinforcing method of vacuum electroosmosis combined prepressing soft soil foundation |
| CN102900067A (en) * | 2012-10-31 | 2013-01-30 | 上海大学 | Processing method for reinforcing soft clay ground through vacuum preloading in combination with electro-osmosis method |
| CN102979082B (en) * | 2012-12-27 | 2014-10-15 | 大连理工大学 | Method for consolidating soft soil foundation by using vacuum and magnetic field compound preloading |
| CN102979082A (en) * | 2012-12-27 | 2013-03-20 | 大连理工大学 | Method for consolidating soft soil foundation by using vacuum and magnetic field compound preloading |
| CN108221949A (en) * | 2018-02-02 | 2018-06-29 | 上海港湾基础建设（集团）股份有限公司 | Double glue mend film device and method to a kind of vacuum preloading under water |
| CN108221949B (en) * | 2018-02-02 | 2023-12-19 | 上海港湾基础建设（集团）股份有限公司 | Vacuum pre-pressing underwater double-adhesive film supplementing device and method |
| CN111562288A (en) * | 2020-07-08 | 2020-08-21 | 中建四局第三建设有限公司 | In-situ test evaluation method for sludge solidification |
| CN111562288B (en) * | 2020-07-08 | 2022-07-08 | 中建四局第三建设有限公司 | In-situ test evaluation method for sludge solidification |
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Open date: 20080312 |