CN101225654A - Blow fill foundation treating method and gas injection draining method therefor - Google Patents
Blow fill foundation treating method and gas injection draining method therefor Download PDFInfo
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- CN101225654A CN101225654A CNA2008100326602A CN200810032660A CN101225654A CN 101225654 A CN101225654 A CN 101225654A CN A2008100326602 A CNA2008100326602 A CN A2008100326602A CN 200810032660 A CN200810032660 A CN 200810032660A CN 101225654 A CN101225654 A CN 101225654A
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Abstract
The invention relates to a processing method about blow-filled foundation, comprising that: a blast-filled ground is leveled, a longitudinal slope is arranged in one direction; blind drains are arranged along the direction of the longitudinal slope; a sand water conveyance cushion layer is paved, a gas injection pipe is buried at the middle position between the blind drains; the blow fill is blast-filled on the sand cushion layer, when the thickness of the blow fill is above 50cm, the gas supplying device is started, the gas is injected into the sand water conveyance cushion layer by the gas injection pipe, gas injection and blast-filling are carried out simultaneously, and the water flowing out from the blind drains is cleaned at the same time; when the thickness of the blow fill is half of the designed monolayer thickness, gas injection pipes are paved on the blow fill, then the blow fill is blast-filled continuously until the thickness of the blow fill reaches monolayer thickness, and gas is injected into the blow fill layer; the above steps are repeated until the thickness of the blow fill reaches the total height; after blast-filling, each layer of gas injection pipes continuously inject gas until the blind drains have no water flowing out. The effect is better if combining with surcharge preloading. The processing method about blow-filled foundation has the advantages of easy implementation, blast-filling and simultaneously injecting gas to drainage, greatly shortening the build-up time of the foundation strength, in favor of the after-maintenance of the foundation strength.
Description
Technical field
The present invention relates to a kind of barged-in fill foundation treatment technology, particularly a kind of gas injection draining that is used for soil solidifying belongs to the soft foundation processing technology field.
Background technology
Flourish along with coastal, city along the river's economy and infrastructure, and further urban development planning, the situation of land-based area land used deficiency appears in more domestic harbours, the mud that dredging is come out is used for the land-based area of sea reclamation or structure bunder, and this has become the important means of land development.Such as Shanghai, as typical soft foundation area,, will reach 85% to the year two thousand twenty urbanization level again on the occasion of the new round master planning period in Shanghai, build total land used 1500km
2, the Changjiang river and East China Sea lefteye will become important industry development band, and so Jin Zhang land used depends on to a great extent to sea, the Changjiang river expansion land-based area, so large tracts of land dredging barged-in fill Measures for Making Ground and Foundation is particularly important.The geotechnical engineering problems relevant with barged-in fill is more and more outstanding, and key problem is the processing of barged-in fill.
At present, the reinforcement measure for the barged-in fill ground mainly contains methods such as two an ash method, deep-mixed pile, piling prepressing, vacuum preloading, precipitating, pre-pressing, electric drainage, vacuum-dewatering associating dynamic compaction.But, because the soil property of barged-in fill ground is often very poor, fixed performance is bad, directly using method precipitation such as vacuum, electric osmose all is difficult to prove effective, use two an ash method, also effect is undesirable for deep-mixed pile, so general employing large tracts of land preloading or vacuum method in using, but its draining is slower, and consolidation time needs 1～3 year.Therefore, necessaryly in the hydraulic reclamation process, barged-in fill is carried out effectively pre-consolidation process.
Handle for barged-in fill ground oozy, produce these difficult reasons and be that mainly its water permeability is too little, water in soil is difficult to discharge.For this reason, the present invention proposes to adopt gas injection draining, with sand cushion and french drain structure drainage system, improve the drainability of drainage system by force to the inner injection pressure gas of sand cushion, force water in the barged-in fill to the drainage system fast moving with the hydraulic slope that increases substantially water in soil seepage flow to the inner injection pressure gas of barged-in fill, finally make whole barged-in fill ground water content significantly reduce, reach the ground treatment effect.If in the gas injection drainage procedure,, then can further improve soil body compactness and bearing capacity of foundation soil in conjunction with traditional piling prepressing.The hydraulic reclamation soil layer lower for water content rams by force, and then effect will be more satisfied.
Summary of the invention
Be to solve draining difficulty, the long problem of ground processing time of barged-in fill, the present invention is proposing on the gas injection water discharge method basis, a kind of discharging consolidation that can quicken ground is provided, shortens the foundation strength barged-in fill method for processing foundation of rise time.
The objective of the invention is to be achieved through the following technical solutions:
A kind of barged-in fill method for processing foundation that utilizes gas injection draining, wherein this processing method comprises:
1) being provided with according to a conventional method with the sand cushion is the barged-in fill of drainage blanket and the multilayer soil structures that sand cushion is provided with at interval,
2) french drain of central drainage is set in the sand cushion with water delivery effect,
3) in water delivery sand cushion and hydraulic reclamation soil layer, bury the air injection pipe parallel underground respectively with french drain,
4) in sand cushion laying and barged-in fill process, simultaneously by air injection pipe gas injection in water delivery sand cushion and/or hydraulic reclamation soil layer, and clear up the water of discharging by french drain,
5) repeated multiple times does not finish the ground processing until there being current to flow out the back.
Aforesaid method wherein specifically may further comprise the steps:
1). smooth blast-filled ground is provided with longitudinal gradient at least one direction;
2). be parallel to longitudinal gradient direction layout french drain, then the water delivery sand cushion is filled out in the shop, and buries the air injection pipe that is parallel to the french drain direction in sand cushion underground, and air injection pipe is uniformly distributed in the french drain centre position;
3). the barged-in fill hydraulic reclamation above sand cushion, is reached 50cm when above at barged-in fill, can start feeder by air injection pipe to water delivery sand cushion injecting gas, gas injection and hydraulic reclamation carry out simultaneously, and in time clear up the water that french drain flows out;
4). when barged-in fill thickness reach the design thickness in monolayer half the time, on barged-in fill, be parallel to the french drain direction and lay air injection pipe, then continue hydraulic reclamation to designing thickness in monolayer, start feeder by air injection pipe to hydraulic reclamation soil layer injecting gas;
5). repeating step 2 is provided with second layer drainage system and gas injection device;
6). repeating step 3,4, hydraulic reclamation second layer barged-in fill is also buried gas injection device underground, and carry out gas injection in barged-in fill;
7). after all hydraulic reclamation soil layers finished, each layer air injection pipe continued gas injection, according on cover the barged-in fill body weight and regulate gas injection pressure, till french drain does not have current to flow out; Gas injection once more after gas injection stops a period of time is until there not being current to flow out; So repeated multiple times does not finish the ground processing to there being current to flow out the back.
Aforesaid method, wherein the barged-in fill thickness in monolayer is 1.5～4.0m, the desirable big value of the barged-in fill that water permeability is stronger.
Aforesaid method, wherein the longitudinal gradient of She Zhiing is unidirectional slope or double pitch.
Aforesaid method, wherein the thickness of water delivery sand cushion is not less than 10cm.
Aforesaid method, wherein said french drain comprises that with sandstone be traditional french drain of anti-filtering material, industrial plastics french drain or the drainage channel be made up of many plastic draining boards, the french drain gradient is not less than 1%, the laying spacing is 10～30 times of barged-in fill thickness in monolayer, for the coarse sand bed course capping of highly permeable.
Aforesaid method, wherein said air injection pipe, air injection pipe arrangement pitch in the hydraulic reclamation soil layer is 0.5～0.8 times of individual layer barged-in fill thickness, its material is a plastic conduit, caliber 15～30mm, have the injecting hole of aperture 1.5～2.5mm on the tube wall, pitch-row is 30～80 times of aperture, and the outsourcing filter screen.
Aforesaid method, wherein gas injection pressure exceeds to cover barged-in fill on can not puncturing, and preferentially get the vertical soil pressure in air injection pipe present position 0.3～1.2 times, increases force value in the gas injection process gradually, when water outlet seldom the time, can increase gas injection pressure and come forced drainage.
Realize the gas injection draining of method as mentioned above, comprise the drainage system that contains sand cushion and french drain, wherein also comprise gas injection device and air injection pipe, this gas injection device forces water in soil to discharge by drainage system to hydraulic reclamation soil body injection pressure gas.This air injection pipe is parallel to the french drain setting, and the air injection pipe that is arranged in sand cushion is arranged in the centre position of french drain, and the air injection pipe that is arranged in barged-in fill is uniformly distributed in the medium height position of each layer barged-in fill.
Compared with prior art, simple to operate, the easy construction of the present invention has following outstanding advantage:
1). the present invention can quicken the discharging consolidation of ground, shortens foundation strength rise time.Processing method of the present invention, key is in conjunction with gas injection draining, by the soil body splitting effect under gas diffusion and the gas pressure effect, improve the waterpower osmosis gradient and the inner soil body penetration performance of water in soil, shortened the efflux time of hydraulic reclamation water in soil greatly, and the draining of gas injection simultaneously in the hydraulic reclamation process, further shortened the ground treatment construction phase.Simultaneously, another significant advantage of the present invention is, method of gas injection has determined that the soil body water content of treated large volume, large tracts of land barged-in fill inside is very low, and this bearing capacity to ground is highly beneficial.
2). the invention process is easy.Because the main device of the present invention is a gas injection device, it is buried underground conveniently, and the gas flow that needs in the gas injection and little, only needs to keep and the suitable stable air pressure of last earthing body vertical pressure, so in general, several air compressor machines just can meet the demands.Simultaneously, as the sand cushion and the french drain of drainage system, also will become the part of ground.
3). the present invention helps the longterm strength of ground and effectively safeguards.Because the gas injection device among the present invention is an air injection pipe, will forever stay in the barged-in fill ground, so its long-term drainage will help the enough foundation strengths of the long-term maintenance of ground.Simultaneously, also handle alternative preferably is provided,, be expected to reduce following ground processing cost as schemes such as gas injection drainings once more for ground in the future.
Description of drawings
The bottom arrangement of Drainage (double pitch) and the gas injection device of Fig. 1 barged-in fill ground New Method for Processing.
Fig. 2 bottom drainage system sectional view.
The operating principle figure of Fig. 3 barged-in fill ground New Method for Processing.
Gas injection drainage principle figure in Fig. 4 sand cushion～soil body saturation ratio isopleth change procedure.
Fig. 5 air injection pipe structural representation.
The specific embodiment
The present invention is on the basis of the conventional layering soil body dam filling construction that reduces soil consolidation percolation path length, in conjunction with gas injection draining, forms a kind of novel barged-in fill method for processing foundation.This processing method is not to carry out after the barged-in fill ground forms, and ready before hydraulic reclamation, and the ground processing is carried out on hydraulic reclamation limit, limit, can obviously improve barged-in fill Measures for Making Ground and Foundation efficient, the reduction of erection time.Shown in Fig. 1～5, wherein have: 1. blast-filled ground; 2. air injection pipe; 3. water delivery sand cushion; 4. weeper drain; 5. barged-in fill; 6. feeder.
Ground treatment system among the present invention mainly is made up of three parts: gas injection device, drainage system and hydraulic reclamation soil layer (5).The barged-in fill thickness in monolayer is 1.5～4.0m, the desirable big value of the barged-in fill that water permeability is stronger.Drainage system and hydraulic reclamation soil layer are laid (see figure 3) successively at interval, and both all contain gas injection device.Before the hydraulic reclamation, need to lay the gas injection device in bottom drainage system and the bottom sand cushion, its layout is seen Fig. 1 and Fig. 2.Drainage system is made up of sand cushion (3) and french drain (4), and gas injection device is air injection pipe (2) and feeder (6).In the hydraulic reclamation process, the thickness of sand cushion can be subjected to certain influence, so its thickness should be not less than 10cm.French drain can be to be traditional french drain of anti-filtering material, industrial plastics french drain or the drainage channel be made up of many plastic draining boards with sandstone, the french drain gradient is not less than 1%, lay spacing and be the barged-in fill thickness in monolayer 10～30 times, but for sand gravel, the coarse sand bed course capping of highly permeable.Air injection pipe in the hydraulic reclamation soil layer (2) spacing is 0.5～0.8 times of individual layer barged-in fill thickness.Fig. 5 has illustrated the structure of used air injection pipe among the present invention.The air injection pipe material is a plastic conduit, and caliber 15～30mm has the injecting hole of aperture 1.5～2.5mm on the tube wall, and pitch-row is 30～80 times of aperture, and the outsourcing filter screen, prevents that hydraulic reclamation earth from entering in the pipe.
Fig. 4 has illustrated the principle of gas injection draining in the sand cushion.When pressed gas is injected into sand cushion inside, because sand cushion is up and down the more weak soil layer of water permeability, pressed gas can horizontal proliferation in sand cushion, makes the saturation ratio of sand reduce gradually, its saturation ratio isopleth will be gradually away from air injection pipe, thereby progressively drives water in soil out of the soil body.In like manner, when pressed gas injects the lower barged-in fill of water permeability, gas also can spread gradually, just diffusion velocity is comparatively slow, if suitably increase gas injection pressure, barged-in fill also may produce splitting so, radial microscopic checks appears, this will strengthen the water permeability of the hydraulic reclamation soil body, and the water that quickens in the barged-in fill moves to sand cushion, thereby reach the ground treatment effect of barged-in fill.
Concrete implementation step of the present invention is as follows:
1). smooth blast-filled ground (1), longitudinal gradient is set in one direction, can be unidirectional slope or double pitch, specifically see Fig. 1 and Fig. 2;
2). arrange that with design pitch the gradient is not less than 1% french drain (4) being parallel to the longitudinal gradient direction, then the water delivery sand cushion (3) that thickness is not less than 10cm is filled out in the shop, and in sand cushion, bury the air injection pipe (2) that is parallel to the french drain direction underground, the centre position of air injection pipe between french drain, each root air injection pipe is installed an air valve, injects with control gas;
3). with barged-in fill (5) hydraulic reclamation above sand cushion, reach 50cm when above at barged-in fill, can start feeder (6) by air injection pipe to water delivery sand cushion injecting gas, to cover barged-in fill be principle to gas pressure not puncture, gas injection and hydraulic reclamation carry out simultaneously, and in time clear up the water that french drain flows out, keep the unobstructed property of draining of french drain;
4). when barged-in fill thickness reach the design thickness in monolayer half the time, on barged-in fill, be parallel to the french drain direction and lay air injection pipe with a determining deviation, then continue hydraulic reclamation to designing thickness in monolayer, start feeder by air injection pipe to hydraulic reclamation soil layer injecting gas, to cover barged-in fill be principle to gas pressure not puncture;
5). repeating step 2 is provided with second layer drainage system and gas injection device, because the first floor barged-in fill is in that just hydraulic reclamation end fashion is not fixed, so the laying of this layer sand cushion adopts the mode of hydraulic reclamation comparatively suitable;
6). repeating step 3,4, hydraulic reclamation second layer barged-in fill is also buried gas injection device underground, and carry out gas injection in barged-in fill;
7). if any more hydraulic reclamation soil layer, repeating step 5,6;
8). after hydraulic reclamation finished, each layer air injection pipe continued gas injection, according on cover the barged-in fill body weight and regulate gas injection pressure, and keep stable gas pressure, till french drain does not have current to flow out; After gas injection stops a period of time, start the feeder gas injection once more, till french drain does not have current to flow out; So after the repeated multiple times,, then finish ground and handle if no current flow out.If in conjunction with the barged-in fill piling prepressing, effect is better in the gas injection process.Processing can be handled in conjunction with foundation dynamic consolidation after finishing, and further makes ground closely knit.
Claims (9)
1. barged-in fill method for processing foundation that utilizes gas injection draining is characterized in that this processing method comprises:
1) being provided with according to a conventional method with the sand cushion is the barged-in fill of drainage blanket and the multilayer soil structures that sand cushion is provided with at interval,
2) french drain of central drainage is set in the sand cushion with water delivery effect,
3) in water delivery sand cushion and hydraulic reclamation soil layer, bury the air injection pipe parallel underground respectively with french drain,
4) in sand cushion laying and barged-in fill process, simultaneously by air injection pipe gas injection in water delivery sand cushion and/or hydraulic reclamation soil layer, and clear up the water of discharging by french drain,
5) repeated multiple times does not finish the ground processing until there being current to flow out the back.
2. the method for claim 1 is characterised in that specifically may further comprise the steps:
1). smooth blast-filled ground is provided with longitudinal gradient at least one direction;
2). be parallel to longitudinal gradient direction layout french drain, then the water delivery sand cushion is filled out in the shop, and buries the air injection pipe that is parallel to the french drain direction in sand cushion underground, and air injection pipe is uniformly distributed in the french drain centre position;
3). the barged-in fill hydraulic reclamation above sand cushion, is reached 50cm when above at barged-in fill, can start feeder by air injection pipe to water delivery sand cushion injecting gas, gas injection and hydraulic reclamation carry out simultaneously, and in time clear up the water that french drain flows out;
4). when barged-in fill thickness reach the design thickness in monolayer half the time, on barged-in fill, be parallel to the french drain direction and lay air injection pipe, then continue hydraulic reclamation to designing thickness in monolayer, start feeder by air injection pipe to hydraulic reclamation soil layer injecting gas;
5). repeating step 2 is provided with second layer drainage system and gas injection device;
6). repeating step 3,4, hydraulic reclamation second layer barged-in fill is also buried gas injection device underground, and carry out gas injection in barged-in fill;
7). after all hydraulic reclamation soil layers finished, each layer air injection pipe continued gas injection, according on cover the barged-in fill body weight and regulate gas injection pressure, till french drain does not have current to flow out; Gas injection once more after gas injection stops a period of time is until there not being current to flow out; So repeated multiple times does not finish the ground processing to there being current to flow out the back.
3. method as claimed in claim 2 is characterised in that the barged-in fill thickness in monolayer is 1.5～4.0m, the desirable big value of the barged-in fill that water permeability is stronger.
4. method as claimed in claim 2, the longitudinal gradient that is characterised in that the step 1) setting is unidirectional slope or double pitch.
5. method as claimed in claim 2 is characterised in that the thickness of water delivery sand cushion is not less than 10cm.
6. method as claimed in claim 2, being characterised in that step 2) described french drain comprises that with sandstone be traditional french drain of anti-filtering material, industrial plastics french drain or the drainage channel be made up of many plastic draining boards, the french drain gradient is not less than 1%, the laying spacing is 10～30 times of barged-in fill thickness in monolayer, for the coarse sand bed course capping of highly permeable.
7. method as claimed in claim 2, be characterised in that described air injection pipe, air injection pipe arrangement pitch in the hydraulic reclamation soil layer is 0.5～0.8 times of individual layer barged-in fill thickness, its material is a plastic conduit, caliber 15～30mm, have the injecting hole of aperture 1.5～2.5mm on the tube wall, pitch-row is 30～80 times of aperture, and the outsourcing filter screen.
8. method as claimed in claim 2, be characterised in that gas injection pressure exceeds to cover barged-in fill on can not puncturing, preferentially get the vertical soil pressure in air injection pipe present position 0.3～1.2 times, increase force value in the gas injection process gradually, when water outlet seldom the time, can increase gas injection pressure and come forced drainage.
9. realize the gas injection draining of claim 1 or 2 described methods, comprise the drainage system that contains sand cushion and french drain, it is characterized in that also comprising gas injection device and air injection pipe, this gas injection device is to hydraulic reclamation soil body injection pressure gas, force water in soil to discharge by drainage system, this air injection pipe is parallel to the french drain setting, and the air injection pipe that is arranged in sand cushion is arranged in the centre position of french drain, and the air injection pipe that is arranged in barged-in fill is uniformly distributed in the medium height position of each layer barged-in fill.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100326602A CN101225654B (en) | 2008-01-15 | 2008-01-15 | Blow fill foundation treating method and gas injection draining device therefor |
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| CN2008100326602A CN101225654B (en) | 2008-01-15 | 2008-01-15 | Blow fill foundation treating method and gas injection draining device therefor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603308B (en) * | 2009-04-23 | 2011-01-05 | 上海交通大学 | Safe construction method applied to strong structure soft soil by preloading method |
| CN102498772A (en) * | 2011-11-07 | 2012-06-20 | 天津市北方园林生态科学技术研究所 | Method for in-situ improvement of dredger fill into soil for planting |
| CN103437338A (en) * | 2013-08-28 | 2013-12-11 | 东南大学 | Reinforcing dredger fill foundation construction method combining drainage well and air pressure splitting |
| CN110966008A (en) * | 2019-12-31 | 2020-04-07 | 兰州理工大学 | Pre-reinforcement construction method of water-rich loess and tunnel construction method |
| CN112176806A (en) * | 2020-10-16 | 2021-01-05 | 于胜泉 | Stable road soft foundation treatment method and matched soft foundation treatment construction system |
| CN112420255A (en) * | 2020-09-10 | 2021-02-26 | 杭州富通电线电缆有限公司 | Breakdown-preventing cable |
| CN113186898A (en) * | 2021-04-12 | 2021-07-30 | 广州市市政工程设计研究总院有限公司 | Soft soil foundation reinforcement treatment method |
| CN113431019A (en) * | 2021-06-03 | 2021-09-24 | 上海市基础工程集团有限公司 | A pressurization gas injection device for quick drainage of soil body |
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| CN1221713C (en) * | 2004-03-09 | 2005-10-05 | 徐土龙 | Method of processing soft foundation by quick low position high vacuum layering pre-compacting consolidation |
| CN100473786C (en) * | 2006-03-23 | 2009-04-01 | 周健 | Soft soil foundation high side pressure quick-discharging consolidation method |
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- 2008-01-15 CN CN2008100326602A patent/CN101225654B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603308B (en) * | 2009-04-23 | 2011-01-05 | 上海交通大学 | Safe construction method applied to strong structure soft soil by preloading method |
| CN102498772A (en) * | 2011-11-07 | 2012-06-20 | 天津市北方园林生态科学技术研究所 | Method for in-situ improvement of dredger fill into soil for planting |
| CN103437338A (en) * | 2013-08-28 | 2013-12-11 | 东南大学 | Reinforcing dredger fill foundation construction method combining drainage well and air pressure splitting |
| CN103437338B (en) * | 2013-08-28 | 2015-05-06 | 东南大学 | Reinforcing dredger fill foundation construction method combining drainage well and air pressure splitting |
| CN110966008A (en) * | 2019-12-31 | 2020-04-07 | 兰州理工大学 | Pre-reinforcement construction method of water-rich loess and tunnel construction method |
| CN112420255A (en) * | 2020-09-10 | 2021-02-26 | 杭州富通电线电缆有限公司 | Breakdown-preventing cable |
| CN112176806A (en) * | 2020-10-16 | 2021-01-05 | 于胜泉 | Stable road soft foundation treatment method and matched soft foundation treatment construction system |
| CN112176806B (en) * | 2020-10-16 | 2021-10-29 | 于胜泉 | Stable road soft foundation treatment method and matched soft foundation treatment construction system |
| CN113186898A (en) * | 2021-04-12 | 2021-07-30 | 广州市市政工程设计研究总院有限公司 | Soft soil foundation reinforcement treatment method |
| CN113431019A (en) * | 2021-06-03 | 2021-09-24 | 上海市基础工程集团有限公司 | A pressurization gas injection device for quick drainage of soil body |
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