CN104652409B - A kind of forced-ventilated water continuously combines the close soft foundation processing technology method of rammer - Google Patents
A kind of forced-ventilated water continuously combines the close soft foundation processing technology method of rammer Download PDFInfo
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- CN104652409B CN104652409B CN201410816937.6A CN201410816937A CN104652409B CN 104652409 B CN104652409 B CN 104652409B CN 201410816937 A CN201410816937 A CN 201410816937A CN 104652409 B CN104652409 B CN 104652409B
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- close
- soft
- downcomer
- spring
- rammer
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
Abstract
A kind of forced-ventilated water continuously combines the close soft foundation processing technology method of rammer, it is according to the reinforcement depth of barged-in fill and soil body osmotic coefficient, according to a determining deviation soft downcomer of lateral arrangement spring in the range of inside soil body certain depth, spring soft downcomer two ends are connect with vacuum extractor by sealing device, are internally formed transverse drainage system at soil mass consolidation and carry out intensifying drainage；Place level of ground water is passed through to become energy several times and is rammed the discharging consolidation of close acceleration ground after being reduced to below earth's surface 2～4m.The arrangement of Drainage that the method uses is inside soil mass consolidation, drainage effect is obvious, when ramming close construction, draining synchronizes to carry out, greatly accelerate the dissipation ramming the close excess pore water pressure caused, shorten and ram the close intermittent time, it is achieved that the combination of the close two kinds of technical advantages of forced-ventilated water, power rammer, there is the duration short, consolidation effect is good, and cost is low, saves the advantages such as resource.
Description
Technical field
The invention belongs to civil engineering reinforced soft soil ground process technique of design and construction, reclaiming land around sea soft foundation processing technology method, particularly to
The infiltration coefficient that reclaiming land around sea is formed is more than 10-6The saturated dredger soft soil of cm/s (the most saturated silt, flour sand, silty clay and press from both sides containing silt
The muck soil etc. of layer) new technique of stiffening basic ground: a kind of forced-ventilated water continuously combines the close soft foundation processing technology method of rammer.
Background technology
In order to alleviate the restriction that coastal economy is developed by land resource, a lot of areas of China coast form land-based area by land reclamation mode.Blow
Banket based on flour sand, silt, silty clay and muck soil.During hydraulic reclamation, destroy the original structure of soil, form a kind of disturbance,
There is the foundation soil of the features such as high-moisture percentage, high void ratio, high-compressibility, low-intensity, engineering construction need can not be met without consolidation process
Want.
The soil how on the soft soil foundation after hydraulic reclamation completes, the formation of fast, economical can be utilized becomes urgent problem.
The reinforcement means of blowing filling soft soil foundation has multiple method, wherein conventional method to have draining concretion method and precipitation dynamic consolidation method etc..Draining
Consolidation method technical maturity, consolidation effect are good, but long in time limit, cost is higher, consume a large amount of natural resources.Precipitation dynamic consolidation method is a kind of
The soft-soil foundation treatment method that developed recently gets up, has obtained wide in reclaimed ground (particularly Thief zone coefficient barged-in fill) reinforcing project
General application, the method first inserts vertical downcomer and carries out vacuum-dewatering, and after precipitation to certain depth, tube drawing carries out strong rammer, repeat after strong rammer more than
Step repeated intubation precipitation, tube drawing and strong rammer complete foundation stabilization.But the method precipitation and dynamic consolidation construction can not synchronize be carried out, repeatedly plug-pull tube
I.e. add workload can not be discharged by the super quiet pore water that produce during strong rammer in time again, extend the intermission between ramming for twice；Simultaneously
Repeatedly use water jetting plug downcomer to cause the top layer soil body to soak and the disturbance of deep soil, artificially add the difficulty of construction.
Summary of the invention
The technical problem to be solved is: provide the new technique that a kind of blowing filling soft soil foundation is reinforced, particularly infiltration coefficient to be more than
10-6The blowing filling soft soil foundation of cm/s processes a kind of forced-ventilated water continuously and combines the close soft foundation processing technology method of rammer.This technique extension is traditional
Heavy-tamping method cannot reinforce the limitation of saturated dredged soft soil, overcomes some shortcomings of precipitation dynamic consolidation method, by strong water discharge technology continuously with dynamic
Power is rammed secret skill art and is combined, and forms a kind of combined type and reinforces new technique.The present invention does not use the natural resourcess such as sand material in reinforcing process, makes
Valency is low, and the duration is short, and reinforcing groundwork bearing capacity, up to more than 100kPa, is a kind of new technique of Soft Ground.
In order to achieve the above object, the technical scheme is that
A kind of forced-ventilated water continuously combines the close soft foundation processing technology method of rammer, it is characterised in that: soft for spring downcomer is embedded in hydraulic reclamation compacted soil
In body；Spring soft downcomer two ends are connect with vacuum extractor by sealing device, are internally formed transverse drainage system at soil mass consolidation, enter
Row intensifying drainage；After reinforcing area level of ground water reduces 2.0-4.0m, the change energy carried out rams close, makes tamping energy progressively transmit to deep layer, adds
Gu deep soil；Strong drainage system is needed to work continuously while ramming close construction.
The soft downcomer of spring used, diameter 30-60mm, spring body, by high-tensile steel wires coiling, wraps up in filter cloth and nothing outside spring body
Spin cloth, outside spring body, wrap up in filter cloth, non-woven fabrics and filter cloth the most successively.
The soft downcomer of described spring is laterally embedded in inside reinforcing soil layer；The depth of burying is 2-6m, and spacing is 3-10m, and length is according to adding
Gu area planar size determines；The soft downcomer of spring vertically can divide 1-3 layer to arrange, interlamellar spacing 1-3m.
Described change energy ram close into: point rams 2-3 time, completely rams one time.
Advantages of the present invention: compared with traditional precipitation dynamic consolidation method,
The most traditional precipitation dynamic consolidation method downcomer uses and vertically plugs, and downcomer filter is positioned at bottom, long 1.0-1.2m, filter openings
Rate is 20%-30%.The soft downcomer of spring that the present invention uses uses spring body structure, and percent opening reaches more than 80%；Downcomer is overall
Laterally being embedded in inside soil mass consolidation, the soft downcomer of whole spring can be permeable, considerably increases filter length.Therefore this
The soft downcomer of spring of bright use is greatly improved precipitation efficiency, shortens precipitation time more than 50%.
2. the soft downcomer of spring that the present invention uses is embedded in inside soil mass consolidation, and ramming the soft downcomer of spring in close work progress will not be close because ramming
Producing and destroy, precipitation can synchronize be carried out with ramming close construction, solves precipitation and a difficult problem that the close construction of rammer interferes.Work progress is hit by a bullet
The soft downcomer of spring has only to bury the precipitation that once can realize in whole work progress underground, decreases the workload repeatedly plugging downcomer
With the plug downcomer disturbance to soil mass consolidation, facilitate site operation machine-walking；
3. being arranged in inside soft soil foundation due to the soft downcomer of spring, drainage system can work always, is formed at inside soil body when ramming close construction
Free water is discharged rapidly by transverse drainage system along ramming close vibrations at inside soil body generation minute fissure, and excess pore water pressure disappears rapidly
Dissipate, substantially reduce the intermittent time between twice close construction of rammer, it is achieved that intensifying drainage and the close two kinds of technical advantages of power rammer effective
In conjunction with, shorten the duration, improve strengthening quality.
4. to reinforce the new barged-in fill duration short for the present invention, 20-35 days；Consolidation effect is good, reinforces groundwork bearing capacity at more than 100kPa；Reinforce deep
Degree 8-10m；Cost is low, and cost can reduce 20-30% compared with precipitation dynamic consolidation method；Reinforcing process does not use the natures such as sand material
Resource, environmental protection.
Accompanying drawing illustrates:
Fig. 1 constructs axonometric chart
Fig. 2 .1 spring soft downcomer plane graph
Fig. 2 .2 spring soft downcomer side view
The soft downcomer of Fig. 3 .1 spring be connected with sealing device front view,
The soft downcomer of Fig. 3 .2 spring is connected side view with sealing device
Fig. 4 trial zone tamping point layout drawing
In figure: 1 tamping machine, 2 vacuum pumps, 3 barged-in fills, 4 sealing pipes, the 5 soft downcomers of spring, 6 spring bodies, 7 filter clothes, 8 non-woven fabrics,
Detailed description of the invention
The present invention is described in further detail with instantiation below in conjunction with the accompanying drawings, it is simple to be well understood to the present invention, but they are not to this
Invention constitutes restriction.
Geologic prospect should be carried out at the engineering construction initial stage, understand hydraulic reclamation the thickness of the layer, water content, granule composition, infiltration coefficient etc. in detail
Crucial soil indicator, determines the close pass of compacted soil layer thickness, tamping energy, rammer and the construction parameter such as spring soft downcomer depth of placement and spacing.
Certain engineering land-based area is formed by waterpower hydraulic reclamation, prospecting report understand this engineering barged-in fill and contain silt based on silt, silty clay, local
Mud short lap, soil thickness about 6.2m, water content 30.8%, plasticity index 8.7, liquid limit 24.7%, infiltration coefficient 2.11 × 10-4Cm/s,
Grading analysis shows, particle diameter be the fine content of 0.25-0.075mm be 35.2%, the silt content of 0.075-0.005mm is 55.3%, little
It is 9.5% in 0.005mm clay content.50m × 100m region is selected to carry out trial zone.
The horizontal drainage passage that trial zone uses uses a kind of novel geosynthetics tubing-soft downcomer of spring, has following sections to constitute
(see Fig. 2): spring body, polymer fiber fabric filter cloth, non-woven fabrics.Spring body is made up of high-tensile steel wires, with common plastics chimney filter phase
Ratio, has ring stiffness high, up to 40kN/, and the advantage that percentage elongation is high；Polymer fiber fabric filter cloth has tension and wear-resisting intensity is high
Feature, filter cloth plays anti-filter and prevents the effect that fine particle runs off in the soil body.
Trial zone spring soft downcomer arrangement length 50m, spacing 4m, depth of burying 3.5m, ram close construction and use some rammer completely to ram 1 three times
Time method, grid spacing 4m (such as Fig. 4), spring
Soft downcomer is embedded in the tamping point axial location of the 3rd time some rammer.Owing to precipitation initial stage soft soil foundation intensity is relatively low, ram close during use become
The mode of energy, ramming close first pass tamping energy is 1200kN m, reinforces 0-3m shallow layer foundation, and ramming close second time tamping energy is 2000kN m,
Tamping energy transmits to deep layer, reinforces 3-5m scope ground, and ramming close 3rd time tamping energy is 2500kN m, and tamping energy transmits to deep layer, reinforces
5-8m scope deep foundation base, finally carries out 800kN m and completely rams.
Bury 2, water-level observation hole, pore water pressure sensor 2 groups before trial zone dewatering construction in stabilization zone underground, arrange really according to tamping point figure
The particular location of fixed soft downcomer, carries out setting-out construction, buries the soft downcomer of spring underground.4.0m buried to earth's surface underground by the soft downcomer of spring
Depth, length 50m, spacing 4m, 26 altogether, every spring soft downcomer two ends sealing device be connected with vacuum pump carry out strong
Power draining.Trial zone surrounding buries precipitation tube sealing underground, cuts off the supply at surrounding water source.After 5 days, level of ground water reduces about 3.0m, carries out first pass
Ramming close, ram and close cause level of ground water to rise very rapidly up to earth's surface, ground pore water pressure rises rapidly, forced-ventilated water precipitation system one when ramming close construction
Straight work, accelerates to ram the close ground excess pore pressure dissipation caused, and after point rams 2 days, pore water pressure dissipation reaches 75%, carries out second
Close all over ramming, 2 days used times, after 2 days, to carry out the 3rd time rammer close for pore pressure dissipation 75%, 2 days used times, after carry out full ramming 3 days used times, the duration is common
Count 20 days.Carried out static load test after reinforcing, original state fetches earth and standard penetration test, and characteristic value of foundation bearing capacity is 110kPa, reinforces
The degree of depth reaches 8m.
This continuous forced-ventilated water combines the close soft foundation processing technology method of rammer, first according to reinforcement depth and the infiltration coefficient of barged-in fill, according to a depthkeeping
Degree and spacing soft for the spring cut downcomer is laterally embedded in inside soil mass consolidation, spring soft downcomer two ends by sealing device with
Vacuum pump connects, and the Free water strength of inside soil body is discharged by vacuum pump, carries out when level of ground water is reduced to earth's surface 2.0-4.0m becoming energy
The rammer of amount is close, and during power rammer is close, transverse drainage system works always, accelerates to ram the dissipation of the super quiet hole waterpower of the close ground caused.This skill
Art reinforcing soft ground consolidation time is 20～35 days.
Claims (2)
1. a continuous forced-ventilated water combines the close soft foundation processing technology method of rammer, it is characterised in that: soft for spring downcomer is embedded in hydraulic reclamation and adds
Gu in the soil body；Spring soft downcomer two ends are connect with vacuum extractor by sealing device, are internally formed transverse drainage system at soil mass consolidation,
Carry out intensifying drainage；After reinforcing area level of ground water reduces 2.0-4.0m, the change energy carried out rams close, makes tamping energy progressively transmit to deep layer,
The reinforcing deep soil body；Strong drainage system is needed to work continuously while ramming close construction.
One the most according to claim 1 continuous forced-ventilated water combines the close soft foundation processing technology method of rammer, it is characterised in that: described spring
Soft downcomer is laterally embedded in inside reinforcing soil layer；The depth of burying is 2-6m, and spacing is 3-10m, and length is according to reinforcing area planar dimension
Determine；The soft downcomer of spring vertically can divide 1-3 layer to arrange, interlamellar spacing 1-3m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2032770B1 (en) * | 2022-08-17 | 2024-02-27 | Fnv Ip Bv | Method for densification of an amount of soil and apparatus |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106192981B (en) * | 2016-07-08 | 2018-04-03 | 河海大学 | A kind of Dewatering dynamic compaction integrated device and its application method |
| CN106869107A (en) * | 2017-02-28 | 2017-06-20 | 河北工业大学 | The novel solid drainage system and its dewatering construction method of a kind of reinforcing soft ground |
| CN107700469B (en) * | 2017-09-08 | 2023-08-25 | 浙江省水利河口研究院 | Deformable silt liquefaction-resistant drainage device and application method thereof |
| CN108149671B (en) * | 2018-02-07 | 2023-07-21 | 武汉南方旭域科技工程有限公司 | Reciprocating type vibrating strong rammer |
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