CN104018487B - Vacuum preloading shallow-layer solidification method based on newly-reclaimed ultra-soft soil foundation - Google Patents
Vacuum preloading shallow-layer solidification method based on newly-reclaimed ultra-soft soil foundation Download PDFInfo
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- CN104018487B CN104018487B CN201410275426.8A CN201410275426A CN104018487B CN 104018487 B CN104018487 B CN 104018487B CN 201410275426 A CN201410275426 A CN 201410275426A CN 104018487 B CN104018487 B CN 104018487B
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Abstract
The invention relates to a vacuum preloading shallow-layer solidification device based on a newly-reclaimed ultra-soft soil foundation. The vacuum preloading shallow-layer solidification device is characterized by comprising a first woven fabric layer, a second vitex-fence layer, a third non-woven fabric layer, a plurality of sets of drainage plates, a drainage filtering pipe, a fourth geogrid layer, a fifth non-woven fabric layer and two layers of sealing films, wherein the first woven fabric layer, the second vitex-fence layer, the third non-woven fabric layer, the drainage plates, the drainage filtering pipe, the fourth geogrid layer, the fifth non-woven fabric layer and the two layers of sealing films are laid on the upper surface of the newly-reclaimed ultra-soft soil foundation in sequence, a sealed cavity is defined by the sealing films and the newly-reclaimed ultra-soft soil foundation in an enclosed mode; the outside of the sealed cavity is connected with a vacuumizing device. A method for conducting vacuum preloading shallow-layer solidification on the newly-reclaimed ultra-soft soil foundation through the shallow-layer solidification device comprises the following steps that (1) the vacuum solidification device is arranged on the newly-reclaimed ultra-soft soil foundation; (2) vacuumizing is carried out for a certain period of time, so that shallow-layer soil obtains definite bearing capacity rapidly. From the fundamental starting point that a silt reclamation force-holding work cushion layer is omitted, shallow-layer reinforcing technology is innovated so that construction of hitting and installing of a plastic drainage plate on a deep layer in a vacuum preloading mode can be satisfied without the need of silt reclamation after shallow-layer reinforcing is carried out.
Description
Technical field
The invention belongs to super soft ground reinforcement technique field, more particularly to a kind of true based on new hydraulic reclamation super soft ground
Empty precompressed shallow-layer curing.
Background technology
With the fast development of China's Coastal Areas economy, land resource growing tension, using basin and waterway dredging soil
Carry out foundation stabilization after land reclamation again and have become the Main Means for alleviating shortage of land resource.Due to the dredging of hydraulic reclamation recently
Soil property mostly is mud, and more than 100%, void ratio is more than 2.0 to its moisture content, and outward appearance is in mud scum～stream pureed, not yet forms tool
There is the soil skeleton structure of intensity, bearing capacity is almost nil.In the face of such super soft ground, mainly entered using vacuum method at present
Row consolidation process.Plastic draining board is set in vacuum method construction technology needs the special equipment that re-packs, and this equipment category is heavy
Machinery, weight is about 10-15 tons.How the mire formed in new hydraulic reclamation dredging markets carries out re-packing constructing becomes the pass of basement process
Key problem, currently for the problem following several method is mainly included：
One is that conventional rail mounted is re-packed into equipment modification into crawler type so as to the mire that can be formed in new hydraulically filled sludge
In directly carry out the operation that re-packs.Transformation re-packs in the method, and equipment cost is higher, and the equipment of re-packing after reequiping in addition can only fall back
Constructed, efficiency of construction is relatively low, the region to completing to re-pack easily causes disturbance destruction, and anti-mud situation during re-packing
Seriously, follow-up vacuum preloading construction is had a certain impact.
Two is the drying that the mire for allowing new hydraulic reclamation dredging markets to be formed first passes through a period of time so as to which top layer passes through natural sediment
Consolidation forms the crust layer with certain bearing capacity, then the flour sand bed course of hydraulic reclamation 80cm～100cm is collectively forming satisfaction and re-packs and sets
The working cushion layer of standby construction.
Three is to carry out shallow-layer vacuum preloading process by artificial plate on the mire formed in new hydraulic reclamation dredging markets so as to table
Layer forms one layer of crust layer with some strength and thickness, and then again the flour sand of hydraulic reclamation 80cm～100cm is collectively forming satisfaction
Re-pack the working cushion layer of equipment construction.
Method two with method three is required to that by the certain thickness flour sand bed course of hydraulic reclamation the construction working pad that re-packs can be met
The requirement of layer, but due to the transition exploitation of flour sand in recent years and use, current flour sand resource is more and more in short supply, and hydraulic reclamation flour sand
Construction is affected larger by weather, it is often necessary to which long period of time just can complete, and this certainly will cause construction costs and duration
It is difficult to ensure that.
In view of three of the above construction technology is to super soft ground reinforcing engineering cost, quality and the Different Effects of duration, I
Work out a kind of " without sand working cushion layer " vacuum method, shallow layer reinforcement can be caused also to be formed without the need for hydraulic reclamation flour sand after processing
Meet the working cushion layer of subsequent mechanical equipment construction.Make vacuum pre-press reinforcing no longer disturbed in flour sand resource, cause the duration and add
Stereoplasm amount is all effectively ensured.
The content of the invention
The present invention provides a kind of cancellation hydraulic reclamation flour sand holding force work pads to solve technical problem present in known technology
Layer is fundamental starting point, by innovating shallow layer reinforcement technical scheme so that also can be expired without the need for hydraulic reclamation flour sand after shallow layer reinforcement process
Sufficient deep vacuum precompressed set the construction of plastic draining board based on new hydraulic reclamation super soft ground vacuum preloading shallow-layer curing.
The present invention is adopted the technical scheme that to solve technical problem present in known technology：
One kind is based on new hydraulic reclamation super soft ground vacuum preloading shallow-layer solidification equipment, it is characterised in that：Shallow-layer solidification equipment
It is mainly included in the ground floor establishment layer of cloth of new hydraulic reclamation super soft ground upper surface laying；The of laying in base fabric upper surface
Two layers of chaste tree basketry layer, in the third layer nonwoven layer of chaste tree basketry upper surface laying；
It is vertical along new hydraulic reclamation super soft ground on the basis of three-decker is laid on above-mentioned new hydraulic reclamation super soft ground
The array drain bar that direction is provided with, the depth of the drainage plate striking is 4.5m；Group drain bar includes four into square layout
Main drain bar and the auxiliary drain bar positioned at square center；Between main drain bar spacing be 0.8～1.0m, main drain bar with it is auxiliary
Spacing is 0.56～0.71m between drain bar；
The equal colligation in end of the array drain bar of above-mentioned laying each drain bar in the same direction in same drainage pipe,
Form several single single worry structures；
The 4th layer of geogrids layer is equipped with the upper surface of above-mentioned single single chimney filter structure；
In the upper surface laying layer 5 nonwoven layer of the 4th layer of geogrids layer；
Two-layer diaphragm seal, described diaphragm seal and above-mentioned new hydraulic reclamation ultra-soft are laid in the upper surface of layer 5 nonwoven layer
Soil base encloses the cavity of a closing, above-mentioned ground floor base fabric, second layer chaste tree basketry layer, third layer nonwoven layer,
The drainage pipe of 4th layer of geogrids layer, layer 5 nonwoven layer and colligation in drain bar end；
The chamber Ligation in vitro vacuum extractor of above-mentioned closing.
New hydraulic reclamation super soft ground vacuum preloading shallow-layer curing is based on using said apparatus,
1), vacuum solidification device is set on new hydraulic reclamation super soft ground；
A, the ground floor establishment layer of cloth laid in new hydraulic reclamation super soft ground upper surface；Adjacent two pieces of base fabrics overlap joint
Width is not less than 10cm；And connected using double line overlap overseam；
B, the second layer chaste tree basketry layer laid in base fabric upper surface；
C, the third layer nonwoven layer laid in chaste tree basketry upper surface；Two pieces of adjacent base fabric lap widths are not less than
20cm, and connected using double line overlap overseam；
D, lay on the basis of three-decker on the above-mentioned new hydraulic reclamation super soft ground, hang down along new hydraulic reclamation super soft ground
Nogata is to the drain bar for plugging；Drain bar is intercepted according to actual needs, and its end asphalt sealing, the drain bar beats
If depth be 4.5m；Every group of drain bar includes four main drain bars into square layout and the auxiliary row positioned at square center
Water plate, spacing is 0.8～1.0m between main drain bar, and spacing is 0.56～0.71m between main drain bar and auxiliary drain bar；
E, the equal colligation in end of array drain bar each drain bar in the same direction of above-mentioned laying are filtered in same draining
Pipe, forms several single single worry structures；
F, it is equipped with the 4th layer of geogrids layer in the upper surface of above-mentioned single single chimney filter structure；
G, above-mentioned 4th layer of geogrids layer upper surface lay layer 5 nonwoven layer；
H, layer 5 nonwoven layer upper surface lay two-layer diaphragm seal；
I, the several vacuum extractors of laying；
2) control of turn on pump rate during, vacuumizing；It is divided into two stages, examination air aspiration stage, formal pumping during vacuumizing
Stage；
A, vacuum extractors are opened in examination points of three batch cycles of air aspiration stage, first opens 1/3 vacuum extractor,
Second batch opens 2/3 vacuum extractor, and the 3rd batch is opened whole vacuum extractors, and every batch of duration treated vacuum for 5 days
Reach 60KPa and proceed to formal air aspiration stage after stablizing 72 hours；
B, formal air aspiration stage, it is desirable to which vacuum extractor is all turned on, it is ensured that vacustat continues in more than 60KPa
The dead load time is vacuumized for 40～50 days；；
C, formal pumping carry out four-bladed vane detection on the 20th day, it is desirable to which the soil body is averagely strong in the range of 2.0～3.0m of ground top layer
Degree is more than 10kPa, if do not reach continuation being evacuated, a four-bladed vane detection is carried out per 10 days, and intensity is unloaded after reaching.
The present invention has the advantages and positive effects that：Because the present invention adopts above-mentioned technical proposal so that present invention tool
Have the advantage that：
1st, basis《Vacuum preloading technical regulation JTS 147-2-2009》Illustrate, when between plastic draining board
During away from less than 0.7m, the disturbance to ground is very big, and plastic draining board sets expense increases more, and the reduction of consolidation time is not
Substantially, therefore the conventional plastic draining board spacing of vacuum preloading is preferably not less than 0.7m.And the present invention is had found by studying, in shallow-layer
Further reduce plastic draining board spacing when processing vacuum preloading, using square center lock pin arrangement, main drain bar and auxiliary row
Spacing between water plate is 0.56～0.71m, and encryption drainage pipe is laid, and using single single tube structure, can be added identical
Gu soil strength is improved rapidly in the time, and soil body vane shear strength increases by 4～5 times compared with traditional handicraft after reinforcing.
2nd, specify that the unloading index of shallow-layer vacuum preloading, it is desirable to which shallow-layer is processed in the range of groundwork 2.0～3.0m of top layer
Soil body mean intensity can be unloaded more than 10kPa side.After guaranteeing that shallow-layer is processed, under without holding force flour sand bed course operating mode, ground holds
Carrying power can also meet the requirement of ram machine construction, increased the safety guarantee coefficient of the construction that re-packs.
3rd, drain bar and chimney filter are connected through and carry out from zip " full parcel " colligation, convenient compared with conventional coupling arrangement,
It is firm, it is ensured that plastic draining board is combined closely with chimney filter, it is effectively reduced vacuum when chimney filter passes to drain bar
Loss, enhances the consolidation effect of vacuum preloading.
In sum, the present invention is shallow by innovating mainly to cancel hydraulic reclamation flour sand holding force working cushion layer as fundamental starting point
Layer reinforcement technique scheme so that can also meet deep vacuum precompressed without the need for hydraulic reclamation flour sand after shallow layer reinforcement process and set plastic draining
The construction of plate.Allow vacuum pre-press reinforcing to be no longer limited by flour sand, the use of flour sand resource is greatly decreased, reduce to a certain extent
Construction costs shortens the duration also can be avoided because resource excessively exploits the environmental disruption for causing.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the overlooking the structure diagram of the present invention
Fig. 3 is every group of drain bar distributed architecture schematic diagram；
Fig. 4 is drainage pipe and drain bar attachment structure schematic diagram.
In figure：1st, base fabric；2nd, chaste tree basketry layer；3rd, nonwoven layer；4th, drain bar；4-1, main drain bar；4-2, auxiliary draining
Plate；5th, drainage pipe；6th, geogrids layer；7th, nonwoven layer；8th, diaphragm seal；9th, vacuum extractor.
Specific embodiment
For the content of the invention, feature and effect of the present invention can be further appreciated that, following examples are hereby enumerated, and coordinate accompanying drawing
Describe in detail as follows：
Fig. 1 to Fig. 4 is referred to, one kind is based on new hydraulic reclamation super soft ground vacuum preloading shallow-layer solidification equipment, shallow-layer solidification
Device is mainly included in the ground floor establishment layer of cloth 1 of new hydraulic reclamation super soft ground upper surface laying；In base fabric upper surface paving
If second layer chaste tree basketry layer 2, chaste tree basketry upper surface laying third layer nonwoven layer 3；
It is vertical along new hydraulic reclamation super soft ground on the basis of three-decker is laid on above-mentioned new hydraulic reclamation super soft ground
The array drain bar 4 that direction is provided with, the depth H 1 of the drainage plate striking is 4.5m；Every group of drain bar includes four into square
The main drain bar 4-1 of the layout and auxiliary drain bar 4-2 positioned at square center；Here main drain bar and auxiliary drain bar all has
Same drain function, name here is only for ease of differentiation.Between main drain bar spacing H2 be 0.8～1.0m, main drain bar
Spacing H3 is 0.56～0.71m between auxiliary drain bar.
The equal colligation in end of the array drain bar of above-mentioned laying each drain bar 4 in the same direction is in same drainage pipe
5, form several single single worry structures；Chimney filter and drain bar are joined directly together by the way of single single tube.Plastic draining board with
Chimney filter " full parcel " is connected and with from zip colligation." full parcel " colligation by carrying out from zip, it is ensured that plastic draining board with
Chimney filter is combined closely, the loss being effectively reduced when vacuum is passed to by chimney filter drain bar, enhance vacuum preloading plus
Gu effect.
The 4th layer of geogrids layer 6 is equipped with the upper surface of above-mentioned single single chimney filter structure；
Layer 5 nonwoven layer 7 is laid in the upper surface of the 4th layer of geogrids layer；
Two-layer diaphragm seal 8 is laid in the upper surface of layer 5 nonwoven layer, described diaphragm seal and above-mentioned new hydraulic reclamation is super
Soft soil foundation encloses the cavity of a closing, above-mentioned ground floor base fabric, second layer chaste tree basketry layer, third layer non-woven fabrics
Layer, the 4th layer of geogrids layer, layer 5 nonwoven layer and colligation drain bar end drainage pipe；
The chamber Ligation in vitro vacuum extractor 9 of above-mentioned closing.
New hydraulic reclamation super soft ground vacuum preloading shallow-layer curing is based on using said apparatus,
1), vacuum solidification device is set on new hydraulic reclamation super soft ground；
A, the ground floor establishment layer of cloth laid in new hydraulic reclamation super soft ground upper surface；Adjacent two pieces of base fabrics overlap joint
Width is not less than 10cm；And connected using double line overlap overseam；
B, the second layer chaste tree basketry layer laid in base fabric upper surface；
C, the third layer nonwoven layer laid in chaste tree basketry upper surface；Two pieces of adjacent base fabric lap widths are not less than
20cm, and connected using double line overlap overseam；
D, lay on the basis of three-decker on the above-mentioned new hydraulic reclamation super soft ground, hang down along new hydraulic reclamation super soft ground
Nogata is to the drain bar for plugging；The depth of the drainage plate striking is 4.5m；Every group of drain bar includes four into square layout
Main drain bar 4-1 and the auxiliary drain bar 4-2 positioned at square center；Between main drain bar spacing be 0.8～1.0m, main draining
Spacing is 0.56～0.71m between plate and auxiliary drain bar.Manually plug plastic draining board：Before construction, first depth is set according to design
Spend and expose size, plastic draining board is cut into into short slab.Then by one end wrench asphalt sealing, mainly prevent negative pressure from taking out
Drainage channel is caused to block from drain bar termination suction plate core in the stream mud at plate bottom during gas.Simultaneously need to also be according to design requirement
The spacing that re-packs carry out construction lofting, be identified on the position for plugging plastic draining board in advance.Work is supervised during plate
Drain bar is inserted to desired depth by people, and checks whether spacing meets design requirement, it is found that spacing is excessive or situation of no marking,
Require in time to carry out complement.
E, the equal colligation in end of array drain bar each drain bar in the same direction of above-mentioned laying are filtered in same draining
Pipe, forms several single single worry structures；
F, it is equipped with the 4th layer of geogrids layer in the upper surface of above-mentioned single single chimney filter structure；
G, above-mentioned 4th layer of geogrids layer upper surface lay layer 5 nonwoven layer；
H, layer 5 nonwoven layer upper surface lay two-layer diaphragm seal；
I, the several vacuum extractors of laying；
During above-mentioned laying vacuum plant, the woven cloth and non-woven fabrics personnel that only subsequent handling is constructed of laying provide must
Operation side wanting, having certain safety guarantee, can also by top layer mud scum and plastic draining wrench and horizontal drainage pipeline every
Open, to ensureing that the permeability at draining networking is favourable.First have to before woven cloth and geotextile laying with portable sewing machine existing
Field suture is integral, and seam is tight, prevent mud from emerging from seam crossing.Should try one's best in process of deployment guarantee laying it is smooth and and
Shi Jinhang ballasts, prevent it from being started or being subjected to displacement by wind.
2) control of turn on pump rate during, vacuumizing；It is divided into two stages, examination air aspiration stage, the loading of full pump during vacuumizing
Air aspiration stage；
A, vacuum extractors are opened in examination points of three batch cycles of air aspiration stage, first opens 1/3 vacuum extractor,
Second batch opens 2/3 vacuum extractor, and the 3rd batch is opened whole vacuum extractors, and every batch of duration treated vacuum for 5 days
Reach 60KPa and proceed to formal air aspiration stage after stablizing 72 hours.；
B, formal air aspiration stage, it is desirable to which vacuum extractor is all turned on, it is ensured that vacustat continues in more than 60KPa
The dead load time is vacuumized for 40～50 days；；
C, formal pumping carry out four-bladed vane detection on the 20th day, it is desirable to which the soil body is averagely strong in the range of 2.0～3.0m of ground top layer
Degree is more than 10kPa, if do not reach continuation being evacuated, a four-bladed vane detection is carried out per 10 days, and intensity is unloaded after reaching.
Because the present invention adopts above-mentioned technical proposal so that the present invention has advantages below：
1st, basis《Vacuum preloading technical regulation JTS 147-2-2009》Illustrate, when between plastic draining board
During away from less than 0.7m, the disturbance to ground is very big, and plastic draining board sets expense increases more, and the reduction of consolidation time is not
Substantially, therefore the conventional plastic draining board spacing of vacuum preloading is preferably not less than 0.7m.And the present invention is had found by studying, in shallow-layer
Further reduce plastic draining board spacing when processing vacuum preloading, and the present invention is had found by studying, and processes vacuum in shallow-layer pre-
Further reduce plastic draining board spacing during pressure, arranged using square center lock pin, between main drain bar and auxiliary drain bar
Spacing is 0.56～0.71m, and encryption drainage pipe is laid, and using single single tube structure, can make in identical consolidation time
Soil strength is improved rapidly, and soil body vane shear strength increases by 4～5 times compared with traditional handicraft after reinforcing.
2nd, specify that the unloading index of shallow-layer vacuum preloading, it is desirable to which shallow-layer is processed in the range of groundwork 2.0～3.0m of top layer
Soil body mean intensity can be unloaded more than 10kPa side.After guaranteeing that shallow-layer is processed, under without holding force flour sand bed course operating mode, ground holds
Carrying power can also meet the requirement of ram machine construction, increased the safety guarantee coefficient of the construction that re-packs.
3rd, drain bar and chimney filter are connected through and carry out from zip " full parcel " colligation, convenient compared with conventional coupling arrangement,
It is firm, it is ensured that plastic draining board is combined closely with chimney filter, it is effectively reduced vacuum when chimney filter passes to drain bar
Loss, enhances the consolidation effect of vacuum preloading.
In sum, the present invention is shallow by innovating mainly to cancel hydraulic reclamation flour sand holding force working cushion layer as fundamental starting point
Layer reinforcement technique scheme so that can also meet deep vacuum precompressed without the need for hydraulic reclamation flour sand after shallow layer reinforcement process and set plastic draining
The construction of plate.Allow vacuum pre-press reinforcing to be no longer limited by flour sand, the use of flour sand resource is greatly decreased, reduce to a certain extent
Construction costs shortens the duration also can be avoided because resource excessively exploits the environmental disruption for causing.
The above is only, to presently preferred embodiments of the present invention, any pro forma restriction not to be made to the present invention,
Every technical spirit according to the present invention is belonged to any simple modification made for any of the above embodiments, equivalent variations and modification
In the range of technical solution of the present invention.
Claims (1)
- It is 1. a kind of to be based on new hydraulic reclamation super soft ground vacuum preloading shallow-layer curing, it is characterised in that：1), vacuum solidification device is set on new hydraulic reclamation super soft ground；A, the ground floor establishment layer of cloth laid in new hydraulic reclamation super soft ground upper surface；Two pieces of adjacent base fabric lap widths Not less than 10cm；And connected using double line overlap overseam；B, the second layer chaste tree basketry layer laid in base fabric upper surface；C, the third layer nonwoven layer laid in chaste tree basketry upper surface；Two pieces of adjacent nonwoven layer lap widths are not less than 20cm, And connected using double line overlap overseam；D, lay on the basis of three-decker on the above-mentioned new hydraulic reclamation super soft ground, the Vertical Square along new hydraulic reclamation super soft ground To the drain bar for plugging；Drain bar is intercepted according to actual needs, its end asphalt sealing, the drainage plate striking Depth is 4.5m；Every group of drain bar includes four main drain bars into square layout and the auxiliary draining positioned at square center Plate, spacing is 0.8～1.0m between main drain bar, and spacing is 0.56～0.71m between main drain bar and auxiliary drain bar；E, the end of array drain bar each drain bar in the same direction of above-mentioned laying are existed using full package structure colligation On same drainage pipe, several single single filter structures are formed；F, it is equipped with the 4th layer of geogrids layer in the upper surface of above-mentioned single single chimney filter structure；G, above-mentioned 4th layer of geogrids layer upper surface lay layer 5 nonwoven layer；H, layer 5 nonwoven layer upper surface lay two-layer diaphragm seal；I, the several vacuum extractors of laying；2) control of turn on pump rate during, vacuumizing；It is divided into two stages, examination air aspiration stage, formal air aspiration stage during vacuumizing；A, vacuum extractors are opened in examination points of three batch cycles of air aspiration stage, first opens 1/3 vacuum extractor, second The vacuum extractor for opening 2/3 is criticized, the 3rd batch is opened whole vacuum extractors, and every batch of duration treated that vacuum reached for 5 days 60KPa simultaneously proceeds to formal air aspiration stage after stablizing 72 hours；B, formal air aspiration stage, it is desirable to which vacuum extractor is all turned on, it is ensured that vacustat persistently takes out true in more than 60KPa The empty dead load time is 40～50 days；C, formal pumping carry out four-bladed vane detection on the 20th day, it is desirable to which soil body mean intensity is big in the range of 2.0～3.0m of ground top layer In 10kPa, if do not reach continuation being evacuated, a four-bladed vane detection was carried out per 10 days, intensity is unloaded after reaching.
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Families Citing this family (3)
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| CN104563063B (en) * | 2014-12-30 | 2016-08-24 | 浙江广川工程咨询有限公司 | A kind of vacuum preloading processing method utilizing compound draining board |
| CN105064324A (en) * | 2015-07-30 | 2015-11-18 | 温州大学 | Vacuum preloading and soil body surface solidification combined processing technique |
| CN108729462A (en) * | 2017-04-20 | 2018-11-02 | 连云港港口工程设计研究院有限公司 | A kind of rapidly solidified method in blowing-filling sludge soft base surface layer |
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