CN100560871C - The method of reinforcing soft soil foundation by gas extrusion drainage and the air bag of use - Google Patents
The method of reinforcing soft soil foundation by gas extrusion drainage and the air bag of use Download PDFInfo
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- CN100560871C CN100560871C CNB2007100570128A CN200710057012A CN100560871C CN 100560871 C CN100560871 C CN 100560871C CN B2007100570128 A CNB2007100570128 A CN B2007100570128A CN 200710057012 A CN200710057012 A CN 200710057012A CN 100560871 C CN100560871 C CN 100560871C
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Abstract
The invention discloses a kind of method of reinforcing soft soil foundation by gas extrusion drainage and the air bag of use, described method is: the endoceliac gas emptying of inflation, the inflation body is inserted in the soft foundation that needs reinforcement; In the inflation body cavity, inflate periodic observation air pressure change and tonifying Qi; Keep inflation body extruding soil layer a period of time, treat that soil layer reaches closely knit requirement back and discharges gas in the inflation body cavity; From soil layer, take out the inflation body, and hole is filled with earth material.Realize that this method adopts airbag apparatus, comprise the pneumatophore and the inserted link of rubber-like multi-cavity chamber, pneumatophore is fixed on the inserted link; The air bag internal layer is an elastomeric material, and skin is a water-repellent fabrics, and two layers of material sticks with glue and connects.Air bag among the present invention can reuse, and the draining energy consumption of exerting pressure is little, and sandstone material consumption is little, and comprehensive cost is low.The consolidation pressure that the inventive method applies is big, and short to the consolidation time of weak soil layer, consolidation effect is good, is applicable to the reinforced soft soil ground of various places and scope.
Description
Technical field
The present invention relates to a kind of method of reinforcing soft soil foundation by gas extrusion drainage and the air bag of use.The method and apparatus that belongs to reinforced soft soil ground in the geotechnical engineering field.
Background technology
At present, the method that soft foundation is carried out consolidation process has multiple, and as sandstone material displacement method, cement stirs reinforcing method, preloading, vacuum method etc.Sandstone material displacement method is to improve the method for bearing capacity of foundation soil with sandstone material all or part of displacement weak soil layer, and this method is effective, but the cost height is not suitable for large-area reinforcing soft foundation in the area that the sandstone material lacks and handles.It is that cement paste or dry cement powder are mixed and stirred into cement-soil with weak soil equably that cement stirs reinforcing method, and cement and water and weak soil generation chemical reaction are after the cement-soil sclerosis, the supporting capacity of ground improves, this method is effective, but cost is very high, needs special-purpose mixing apparatus.Preloading is to set earlier drainages such as sand drain or plastic draining board on soft foundation, lay sand cushion at foundation surface again, on sand cushion, carry out ballast then with methods such as mound or heap weights, moisture in the soft foundation soil layer is discharged, thereby improve the bearing capacity of soft foundation soil layer, the needed ballast time of this method is long, need transport ballast, and consolidation effect is general.Vacuum method also is to set earlier drainages such as sand drain or plastic draining board on soft foundation, lay sand cushion at foundation surface again, on sand cushion and around the reinforcing area, lay air-locked plastic foil then, vacuumize ballast at last, moisture in the soft foundation soil layer is discharged, improve the bearing capacity of soft foundation soil layer, this method institute applied pressure is limited, be no more than an atmospheric pressure, it is long to vacuumize the time that applies ballast, be generally 3～6 months, and consolidation effect is general.Preloading and vacuum method all need to set drainage, lay sand cushion, can make ground produce bigger sedimentation after reinforcing simultaneously, then with the backfill of sandstone material, the sandstone material large usage quantity of Xu Yaoing like this, higher at the regional cost that the sandstone material lacks, in addition, ballast transported and vacuumize all needs bigger energy consumption.In the area that the sandstone material lacks, when consolidation process is carried out in large-scale soft foundation place, adopt vacuum method comparatively economical.
Above-mentioned various comparatively maturations and general reinforcing soft foundation method respectively have pluses and minuses and its applicability.The present invention proposes that a kind of applicability is strong, easy to implement, consolidation effect is good, reinforce short, lower-cost soft soil foundation reinforcing method of duration and device.
Summary of the invention
The objective of the invention is to propose the method and apparatus that reinforced soft soil ground is handled that carries out that a kind of applicability is strong, easy to implement, cost is low.
For achieving the above object, the present invention is realized by following technical proposals: a kind of method of reinforcing soft soil foundation by gas extrusion drainage, it is characterized in that, and comprise following process:
(1) the endoceliac gas emptying of inflation, will inflate body then and insert in the soft foundation soil layer that needs reinforcement;
(2) inflate in the inflation body cavity in inserting soil layer, according to the length of embedment of inflation body and the weak degree of soil layer, to inflate endoceliac air pressure strength control in 10～1000kPa scope, the extruding that inflation body expansion and push soil layer around it, soil layer are subjected to inflating body is released draining part and is able to closely knit; The variation and the tonifying Qi of periodic observation inflation body cavity internal gas pressure intensity keep inflation body cavity internal gas pressure intensity basicly stable; Keep inflation body extruding soil layer a period of time, when treating that the soil layer draining reaches closely knit the requirement, discharge gas in the inflation body cavity, make it to shrink;
(3) in inflation body contraction process, earth material or sandstone material are filled in the hole gap that the limit contraction edge forms between inflation body and soil layer, and the inflation body is outwards extracted on the limit simultaneously; After inflating body and all extracting, hole is tamped with earth material or sandstone material, finish the reinforcing of soft foundation.
Realize said method, the device that adopts comprises air bag, it is characterized in that, this air bag comprises the pneumatophore 1 of rubber-like multi-cavity chamber, and the length direction along pneumatophore in the pneumatophore is provided with an inserted link 4, and pneumatophore 1 is fixed on the inserted link 4, in the lower end of inserted link 4 is cop plug 7 outside pneumatophore, airtight alone chamber 2 is set in the pneumatophore, and each chamber is established the interface 3 that connects appendix 5, and valve 6 is set on the appendix.
Above-mentioned elasticity multi-cavity chamber pneumatophore, its internal layer is a rubber type of material, and skin is a hydrophobic material, and inside and outside two layers of material sticks with glue and connects.
After the above-mentioned pneumatophore inflation, cylindrical or irregular cylindrical or the polygon cylinder of cuboid or cross cylindricality or band fin or the cylindrical column of band fin, the stretching, extension diameter is 0.1～2.0m, length is 1.0m～30.0m.
The chamber of above-mentioned pneumatophore is 1～10.
Above-mentioned cop plug diameter is greater than the inserted link diameter, and the circular cone end face diameter of plug is 3cm～20cm.
Superiority of the present invention is: air bag can reuse, and energy consumption is little, and sandstone material consumption is little, and comprehensive cost is low; The squeeze pressure that puts on the soil body is big, and short to the consolidation time of weak soil layer, consolidation effect is good, is applicable to the reinforced soft soil ground of various places and scope.
Description of drawings
Fig. 1 is that the air bag among the present invention is inserted into the sectional schematic diagram in the soil layer.
Fig. 2 is the sectional schematic diagram of the extruding of the airbag aeration among the present invention soil mass consolidation.
Fig. 3 is hole that air bag forms in soil layer when utilizing the inventive method soil mass consolidation rear gasbag to extract and the sectional schematic diagram of filling with the sandstone material.
Fig. 4 is the sectional schematic diagram that utilizes after the inventive method is finished soil stabilization.
Among the figure, 1 is air bag, and 2 is airbag chamber, and 3 is the appendix interface, and 4 is inserted link, and 5 is appendix, and 6 is valve, and 7 is cop plug, the hole boundary line that 8 air bags when extracting for air bag form in soil layer, and 9 is hole heap sand building stones.
The specific embodiment
One embodiment of the invention is as follows: the airbag apparatus that utilizes reinforcing soft soil foundation by gas extrusion drainage as shown in Figures 1 to 4, main member is the pneumatophore 1 of rubber-like two chambers, alongst be provided with an inserted link 4 in the pneumatophore, pneumatophore 1 is fixed on the inserted link 4, in the lower end of inserted link 4 is cop plug 7 outside pneumatophore, pneumatophore was set as two airtight alone chambers 2 in 1 minute, and each chamber is established the interface 3 that connects appendix 5, and valve 6 is set on the appendix.Cylindrical behind the airbag aeration, the stretching, extension diameter is 0.5m, and length is 15.0m, and the circular cone end face diameter of inserted link plug is 10cm.The air bag internal layer is an elastomeric material, and skin is the plastic draining cardboard, and two layers of material sticks with glue and connects.
When utilizing this kind air bag that soft foundation is carried out consolidation process, implementation method is as follows:
(1) the gas emptying in two airbag chambers, make air bag be contraction-like, utilize inserted link that air bag vertically is inserted in the soft foundation soil layer that needs reinforcement then.
(2) from top to bottom to two air bag interacvity air-fillings, below air pressure strength control in the airbag chamber at 300kPa, above air pressure strength control in the airbag chamber at 200kPa; The interior air pressure intensity of time sight airbag chamber every day, tonifying Qi in airbag chamber when needing keeps keeping above-mentioned air pressure intensity in the airbag chamber; Continue 10～20 days like this, just can make air bag on every side the pore water in the radius 3.0m soil layer partly discharge and reach closely knit; Discharge the air bag intracavity gas afterwards, air bag shrinks.
(3) in inflation body contraction process, the hole gap heap sand building stones that the limit contraction edge forms between inflation body and soil layer, and the inflation body is outwards extracted on the limit simultaneously; After inflating body and all extracting, hole is tamped with the sandstone material, finish the reinforcing of soft foundation.
Behind the airbag aeration, with its peripheral soil body of bigger pressure extrusion, pore water pressure in the soil body increases, at first be to be close to pore water in the soil body of air bag periphery to be penetrated on the outer field adrainage material of air bag and upwards to discharge, As time goes on, also can progressively be penetrated into upwards discharge on the outer field adrainage material of air bag away from the pore water in the soil body of air bag.Along with the pore water in the air bag surrounding soil is extruded, the soil body is compressed, air bag expansion, and air pressure in the air bag reduces, and therefore needs the air pressure intensity in the periodic measurement airbag chamber, and timely make-up gas in airbag chamber is to keep the pressure of its extrusion soil.
In the general soft foundation, air pressure intensity in the airbag chamber can reach 1～3 atmospheric pressure, it is the squeezing action that the soil body of air bag periphery can be subjected to 1～3 atmospheric pressure, under this extruding force effect, drainage speed can be much higher than vacuum method is carried out consolidation process to soft foundation drainage speed.Therefore, when reaching same consolidation effect, the used time of the inventive method is shorter than required times such as vacuum method greatly.
On soft foundation, lay this kind air bag extrusion drainage device, just can carry out consolidation process large-scale place with latticed interval.Used facility in the inventive method all is recyclable, reusable, and the cost of exerting pressure is also very low, and therefore the ratio comparatively dense that air bag can be arranged just can be handled the reinforced soft soil ground of regional area well in a couple of days.
Behind the air bag extrusion soil, can form a hole, when air bag is extracted, can fill some comparatively economic sand class materials in hole, this just makes the foundation soil of being reinforced become a kind of composite foundation, and its bearing capacity can further improve.
Air bag among the present invention can reuse, and the draining energy consumption of exerting pressure is little, and sandstone material consumption is little, and comprehensive cost is low.The consolidation pressure that the inventive method puts on the soil body is big, and short to the consolidation time of weak soil layer, consolidation effect is good, is applicable to the reinforced soft soil ground of various places and scope.
Claims (5)
1. the air bag that uses of the method for a reinforcing soft soil foundation by gas extrusion drainage, this method comprises following process:
(1) the endoceliac gas emptying of inflation, will inflate body then and insert in the soft foundation soil layer that needs reinforcement; (2) inflate in the inflation body cavity in inserting soil layer, according to the length of embedment of inflation body and the weak degree of soil layer, to inflate endoceliac air pressure strength control in 10～1000kPa scope, the extruding that inflation body expansion and push soil layer around it, soil layer are subjected to inflating body is released draining part and is able to closely knit; The variation and the tonifying Qi of periodic observation inflation body cavity internal gas pressure intensity keep inflation body cavity internal gas pressure intensity basicly stable; Keep inflation body extruding soil layer a period of time, when treating that the soil layer draining reaches closely knit the requirement, discharge gas in the inflation body cavity, make it to shrink;
(3) in inflation body contraction process, earth material or sandstone material are filled in the hole gap that the limit contraction edge forms between inflation body and soil layer, and the inflation body is outwards extracted on the limit simultaneously; After inflating body and all extracting, hole is tamped with earth material or sandstone material, finish the reinforcing of soft foundation; It is characterized in that:
Realize that the air bag that described method is used comprises: the pneumatophore (1) of rubber-like multi-cavity chamber, length direction along pneumatophore in the pneumatophore is provided with an inserted link (4), pneumatophore (1) is fixed on the inserted link (4), in the lower end of inserted link (4) is cop plug (7) outside pneumatophore, airtight alone chamber (2) is set in the pneumatophore, each chamber is established the interface (3) that connects appendix (5), and valve (6) is set on the appendix.
2. according to the described air bag of claim 1, it is characterized in that the pneumatophore internal layer is a rubber type of material, skin is a hydrophobic material, and inside and outside two layers of material sticks with glue and connects.
3. according to the described air bag of claim 1, it is characterized in that after the pneumatophore inflation, cylindrical, the stretching, extension diameter is 0.1～2.0m, length is 1.0m～30.0m.
4. according to the described air bag of claim 1, it is characterized in that the chamber of pneumatophore is 1～10.
5. according to the described air bag of claim 1, it is characterized in that the cop plug diameter is greater than the inserted link diameter, the circular cone end face diameter of plug is 3cm～20cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100570128A CN100560871C (en) | 2007-03-27 | 2007-03-27 | The method of reinforcing soft soil foundation by gas extrusion drainage and the air bag of use |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100570128A CN100560871C (en) | 2007-03-27 | 2007-03-27 | The method of reinforcing soft soil foundation by gas extrusion drainage and the air bag of use |
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| CN101033609A CN101033609A (en) | 2007-09-12 |
| CN100560871C true CN100560871C (en) | 2009-11-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102587349A (en) * | 2012-03-22 | 2012-07-18 | 上海市城市建设设计研究总院 | Transverse pressurizing and dewatering air bag device |
| CN112523197A (en) * | 2020-12-10 | 2021-03-19 | 中交（广州）建设有限公司 | Soft foundation lateral loading structure and loading method |
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| CN102116022B (en) * | 2011-01-13 | 2012-03-21 | 中港基业（北京）岩土技术有限公司 | Method for treating soft foundation through overpressure vacuum densification |
| CN105672241B (en) * | 2016-01-29 | 2017-07-25 | 太原理工大学 | Jet is broken ground, and the processing of joint air bag soil compaction is deep to shake the device and method for falling into property loess |
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| CN108952217B (en) * | 2018-07-31 | 2020-12-01 | 中地寅岗建设集团有限公司 | A soil bearing structure for green building |
| CN110295526B (en) * | 2019-06-14 | 2023-08-18 | 广东工业大学 | Assembled road board for marsh lands and installation method thereof |
| CN111827255A (en) * | 2020-03-23 | 2020-10-27 | 同济大学 | Vacuum drainage-pre-killing well, system and working method for transverse flexible loading |
| CN112796295B (en) * | 2021-01-07 | 2022-06-14 | 北京科技大学 | Method for extruding compact rock-soil body through soybean capsule air inflation |
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2007
- 2007-03-27 CN CNB2007100570128A patent/CN100560871C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587349A (en) * | 2012-03-22 | 2012-07-18 | 上海市城市建设设计研究总院 | Transverse pressurizing and dewatering air bag device |
| CN102587349B (en) * | 2012-03-22 | 2014-03-26 | 上海市城市建设设计研究总院 | Transverse pressurizing and dewatering air bag device |
| CN112523197A (en) * | 2020-12-10 | 2021-03-19 | 中交（广州）建设有限公司 | Soft foundation lateral loading structure and loading method |
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| CN101033609A (en) | 2007-09-12 |
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