CN107326891A - A kind of soft foundation discharge fixing system and method - Google Patents
A kind of soft foundation discharge fixing system and method Download PDFInfo
- Publication number
- CN107326891A CN107326891A CN201710576133.7A CN201710576133A CN107326891A CN 107326891 A CN107326891 A CN 107326891A CN 201710576133 A CN201710576133 A CN 201710576133A CN 107326891 A CN107326891 A CN 107326891A
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- China
- Prior art keywords
- plastic draining
- draining board
- sump
- water
- gutter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
Abstract
The invention discloses a kind of soft foundation discharge fixing system and method, the system includes plastic draining board, siphon pipe, plate boots, preloading, sump and suction pump;Gutter is excavated in soft soil foundation, gutter is excavated to below level of ground water, plastic draining board is inserted in gutter, arranged in blossom type, one end of plastic draining board insertion soft soil foundation is installed in the plate boots with plastic draining board phase same material, the water inlet insertion plastic draining board of siphon pipe, and the delivery port of siphon pipe is extend into the sump near soft soil foundation, banketed in gutter, preloading is placed on soft soil foundation surface.Start suction pump to draw water, reduce WIH position of catchmenting, promote soft foundation discharge fixing.
Description
Technical field
The invention belongs to Geotechnical Engineering field, more particularly to a kind of system and method for soft soil foundation.
Background technology
The southeastern coast area of China is always rich and populous ground, assembles substantial amounts of population in this panel region, with population
Constantly pour in, deficient problems concerning land resources become nervous all the more originally.In order to adapt to the economic construction of southeastern coast area not
Disconnected development, building has to build on soft soil foundation.Because soft soil foundation shearing strength is low, moisture content is high, bad hydraulic permeability,
Also there is certain rheological characteristic, therefore construct infrastructure installations at an upper portion thereof, it is necessary to be handled accordingly it.All soft
In native method for processing foundation, more conventional is draining concretion method, and in traditional draining concretion method, the most used is sand
Well ground consolidation, i.e., in Soft Soil Layer injection sand drain or plastic draining board, lay sand bedding course, above sand bedding course on weak soil surface
It is further applied load, carries out the discharging consolidation work of soft soil foundation.
Traditional Sand-drained Ground draining concretion method drainage efficiency is low, and long in time limit, key control point is more.Restrict Sand-drained Ground row
The principal element of water consolidation efficiency is that the well in Sand-drained Ground hinders and film coating perfonnance, so if effectively can reduce in Sand-drained Ground
Well resistance and film coating perfonnance, can effectively shorten the soft soil consolidation time, so as to accelerate construction progress.In recent years, it is many new
Soft-soil foundation treatment method is suggested, for example chemical stabilization, High vacuum compacting method, Vacuum-loading Pre-pressing Method and electric osmose
Concretion method.Chemical stabilization is that curing agent interacts with weak soil using curing agent admixture in weak soil, so that reinforcing soft soil
Base.The physico-mechanical properties of weak soil is the method improve, soft soil foundation intensity can be effectively improved, but due to needing to change weak soil
Structure, therefore can cause some secondary harmful effects, simultaneously as applying curing agent, the environment in region can be changed, therefore
The destruction of ecological environment can be caused, top vegetation can be influenceed.High vacuum impacting decryption method forms pressure difference by high vacuum several times, with reference to
Become energy and hit close, carry out drainage works, gradually reduce weak soil water content.It the method improve traditional draining concretion method, but by
In needing progress to hit close, thus it is restricted to handled place, can not nearby there are the barriers such as high-voltage line, and energy consumption is larger.
Vacuum-loading Pre-pressing Method is as most efficient Soft Ground mode at this stage, by covering airtight on weak soil surface
Geomembrane, using vavuum pump negative pressure source combined heap load precompacting, the air inside weak soil and pore water are discharged, can be shorter
The water inside weak soil is discharged in time, weak soil is reached defined design strength, but this method energy consumption is huge, and complex operation
It is cumbersome, it is necessary to which workmen has abundant operating experience.Consolidation by electroosmosis method is a kind of new foundation drainage consolidation style, is utilized
Directed flow of the pore water under the function of current in weak soil, reduces the water content in weak soil, at the same inside weak soil from
Son, which exchanges also to have weak soil, to have some improvement.Consolidation by electroosmosis method can be carried effectively relative to traditional draining concretion method
High consolidation efficiency, but it is huge to equally exist energy consumption, the problems such as complex operation is cumbersome.Although said new method improves discharging consolidation
Efficiency, but still without well resistance and film coating perfonnance is solved well, accordingly, it would be desirable to a kind of soft soil foundation draining efficiently, easy
Consolidation method.
The content of the invention
In order to make up the problem of existing Soft Ground mode is present, the present invention proposes a kind of soft foundation discharge fixing
System and method.
The purpose of the present invention is to be achieved through the following technical solutions:A kind of soft foundation discharge fixing system, including modeling
Expect drain bar, siphon pipe, plate boots, preloading, sump and suction pump, gutter is excavated in soft soil foundation, gutter, which is excavated, arrives underground
Below water level, plastic draining board is inserted in gutter, adj acent plastic drain bar spacing is 0.5m-1m, is arranged in blossom type, plastic row
Water plate plugs depth for 12m, and the length of plastic draining board is 5m, and one end of plastic draining board insertion soft soil foundation is installed and plastics
In the plate boots of drain bar phase same material, the water inlet insertion plastic draining board of siphon pipe, the delivery port of siphon pipe, which is extend into, to be located at
In sump near soft soil foundation, well depth of catchmenting is 20m, and suction pump is placed at the well head 1m of sump, gutter
Inside banket, preloading is placed on soft soil foundation surface.
When whole system plays a role, the plastic draining board inside weak soil is arranged at due to the preloading of weak soil top surface and weak soil
Gravitative Loads, charge for remittance effect can be produced in plastic draining intralamellar part, therefore water accumulated in plastic draining board, in siphonage
Under, the water accumulated in plastic draining board is discharged, and the water in the weak soil on plastic draining board top is made in gravity and load
Under, continue to collect into plastic draining board, continue to be discharged under siphonage, because weak soil infiltration coefficient is smaller, and rainbow
Suction is a kind of water discharge technology for exempting from power, therefore the process can be carried out continuously, be limited by siphon lift, siphon row
Water can only discharge the water within Soft Soil Layer 10m, but with the lasting progress of drainage procedure, level of ground water is gradually reduced, weak soil
Intergranular pore is filled by water originally, and after decline of groundwater level, inter-granular porosity is filled by air, and pellet pores are in weak soil upper load
It is compacted under being acted on weak soil gravity load, therefore accelerate soft soil consolidation sedimentation, the decline of level of ground water makes soil layer within 10m
Loading increase, the effective stress increase being subject to positioned at below 10m weak soil, thus promote in Soft Soil Layer, away from below earth's surface 10m
Water, collects through plastic draining board bottom and side wall to centre, continues to be discharged under siphonage, therefore siphon drainage is acted on
Manageable thickness of soft soil can be more than 10m.
A kind of soft foundation discharge fixing method, comprises the following steps:
1. excavating gutter in soft soil foundation, gutter is excavated to below level of ground water, and the water inlet of siphon pipe is fixed on
In plastic draining board, siphon pipe is managed from internal diameter 4mm PU, and material identical with plastic draining board is installed in one end of plastic draining board
The plate boots of matter;Plastic draining board is inserted in gutter using mechanization board-plugging device, board-plugging device is extracted, is embedded in plastic draining board
Inside soft soil foundation, it is 5m to be embedded in the plastic draining board length inside soft soil foundation, and plastic draining board insertion depth is 12m,
Adj acent plastic drain bar spacing is 0.5m-1m, is arranged in blossom type;
2. in the neighbouring setting sump of pending soft soil foundation, a diameter of 1m of sump, well depth of catchmenting is 20m,
The siphon pipe of all insertion plastic draining boards is tiled in gutter, and its delivery port is extend into sump together, rainbow in sump
The water outlet height of suction pipe is more than the water inlet open height of siphon pipe in plastic draining board;
3. being banketed in gutter, preloading is then placed on soft soil foundation surface, heap loading capacity should be greater than being equal to design load;
4. starting suction pump to draw water, the water in sump is drained, siphon drainage effect occurs, the water in soft soil foundation by
Siphon pipe is flowed into sump, and the water level in sump rises, and when the water level in sump no longer changes, is again started up
Suction pump.
Compared with prior art, the present invention has advantages below:
(1) 4mm internal diameter siphon pipes are used, when the siphon discrepancy in elevation is 10m, theoretical maximum single tube siphon drainage flow can reach
178mL/s, can significantly improve the drainage rates of soft soil foundation.
(2) the bubble accumulation problem in siphonic process can be effectively reduced using 4mm siphon pipes, makes siphonic process continuous not
Interruption, therefore the whole smooth progress of operation process.
(3) because siphonage is due between liquid molecule caused by gravitation and potential energy difference, therefore it can realize that liquid is exempted from
Dynamic high efficiency is transported, it is only necessary to is consumed the energy consumption that suction pump draws water, can be significantly reduced Soft Ground cost.
(4) preloading is placed on soft soil foundation, soil-squeezing action can be produced, promote the draining of soft soil foundation, level of ground water declines
Afterwards, the soil layer loading increase within 10m, the effective stress increase for being subject to the weak soil positioned at below 10m, thus promote Soft Soil Layer
Below 10m water collects through plastic draining board bottom and side wall to centre, continues to be discharged under siphonage, therefore can be with
Handle below 10m Soft Soil Layer.
(5) the characteristics of exempting from power due to siphon, therefore Auto-drainage can be realized, it is easy to operate, it is easy to live operation.
(6) water outlet height of siphon pipe is more than the water inlet open height of siphon pipe in plastic draining board in sump, can be with
Siphon is set not stopped during operation, so as to ensure being smoothed out for siphon.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention;
Fig. 2 is the structure top view of the present invention;
Fig. 3 is the mechanism figure of the present invention;
Fig. 4 is certain local soft soil consolidation compression schematic diagram of the present invention;
In figure:1. plastic draining board, 2. siphon pipes, 3. gutters, 4. plate boots, 5. preloadings, 6. sumps, 7. suction pumps, 8.
Certain local weak soil.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implement, give detailed embodiment and specific operating process, but protection scope of the present invention be not limited to it is following
Embodiment.
As shown in figure 1, a kind of soft foundation discharge fixing system that the present invention is provided, including plastic draining board 1, siphon pipe
2nd, plate boots 4, preloading 5, sump 6 and suction pump 7, such as Fig. 1~2, excavate gutter 3 in soft soil foundation, and gutter 3, which is excavated, arrives underground
Below water level, plastic draining board 1 is inserted in gutter 3, the spacing of adj acent plastic drain bar 1 is 0.5m-1m, is arranged in blossom type, is moulded
Material drain bar 1 plugs depth for 12m, and the length of plastic draining board 1 is 5m, one end peace of the insertion soft soil foundation of plastic draining board 1
Fill in the plate boots 4 with the phase same material of plastic draining board 1, the water inlet insertion plastic draining board 1 of siphon pipe 2, the water outlet of siphon pipe 2
Mouth is extend into the sump 6 near soft soil foundation, and the depth of sump 6 is 20m, and suction pump 7 is placed on apart from sump 6
Well head 1m at, after the completion of gutter 3 bankets, soft soil foundation surface place preloading 5.
When whole system plays a role, as shown in figure 3, the plastic draining board 1 being arranged inside weak soil is due to weak soil top surface
Preloading 5 and the Gravitative Loads of weak soil, can produce charge for remittance effect inside plastic draining board 1, therefore water accumulates in plastic draining
In plate 1, under siphonage, the water accumulated in plastic draining board 1 is discharged, in the weak soil on the top of plastic draining board 1
Water under gravity and load action, continue to collect into plastic draining board 1, continue to be discharged under siphonage, due to soft
Native infiltration coefficient is smaller, and siphon is a kind of water discharge technology for exempting from power, therefore the process can be carried out continuously, by rainbow
The limitation of lift is inhaled, siphon drainage can only discharge the water within Soft Soil Layer 10m, and as shown in Figure 4 A, weak soil internal void is filled out by water
Fill.With the lasting progress of drainage procedure, level of ground water is gradually reduced, after decline of groundwater level, such as Fig. 4 B, and inter-granular porosity is by sky
Gas is filled, and pellet pores are compacted under weak soil upper load and the effect of weak soil gravity load, therefore accelerate soft soil consolidation to settle,
The decline of level of ground water, makes soil layer loading increase within 10m, the effective stress increase being subject to positioned at below 10m weak soil, such as schemes
Shown in 3, promote below Soft Soil Layer middle-range earth's surface 10m water, collect through the bottom of plastic draining board 1 and side wall to centre, in rainbow
Continue to be discharged under suction effect, therefore the manageable thickness of soft soil of siphon drainage effect can be more than 10m.
Specific implementation step:
1. excavating gutter 3 in soft soil foundation, gutter 3 excavates below level of ground water, the water inlet of siphon pipe 2 is fixed
In plastic draining board 1, siphon pipe 2 can effectively prevent the bubble in siphonic process from accumulating to ask from internal diameter 4mm PU pipes
Topic, while the drainability of siphonage can be played at utmost;Plastic draining board 1 is inserted into side using mechanization board-plugging device
In ditch, during plate, it is ensured that plastic draining board 1 is inserted perpendicularly into, board-plugging device is extracted, plastic draining board 1 is embedded in weak soil
Inside ground, it is 5m to be embedded in the length of plastic draining board 1 inside weak soil, and the insertion depth of plastic draining board 1 is 12m, plastic row
Water plate 1 installs the plate boots 4 with the same material of plastic draining board 1 in its one end, prevents soil particle from entering before insertion soft soil foundation
In plastic draining board 1, prevent in siphonic process, siphon pipe 2 is blocked, influence the progress of siphonic process, plastic draining board 1 is inserted
If complete one at after by board-plugging device be moved to it is next plug a little, the spacing of adj acent plastic drain bar 1 be 0.5m-1m, in blossom type
Arrangement, can at utmost play the coverage of siphon drainage;
2. sump 6 is set near pending soft soil foundation, a diameter of 1m of sump 6, depth is 20m, it is ensured that rainbow
Being drawn through journey can be tiled with last longer, the siphon pipe 2 of all insertion plastic draining boards 1 in gutter 3, and its delivery port is together
It extend into sump 6, because level of ground water is higher than the height of siphon pipe in gutter 32, therefore siphon pipe 2 is put into sump 6
When, siphon drainage work has been turned on, and the water outlet height of siphon pipe 2 is more than siphon pipe 2 in plastic draining board 1 in sump 6
Water inlet open height, therefore ensure the smooth progress of siphonic process;
3. being banketed in gutter 3, preloading 5 is placed after the completion of banketing on soft soil foundation surface, the weight of preloading 5 is not less than design lotus
Carry;
4. starting suction pump 7 to draw water, the water in sump 6 is drained, siphon drainage effect occurs, the water in soft soil foundation
Flowed into by siphon pipe 2 in sump 6, the water level in sump 6 rises, when the water level in sump 6 no longer changes, then
Secondary startup suction pump 7.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, everything utilizes this hair
Either other correlations are changed or be directly or indirectly used in equivalent process to the equivalent structure that bright specification and accompanying drawing content are made
Technical field, be similarly included in the present invention scope of patent protection within.
Claims (4)
1. a kind of soft foundation discharge fixing system, it is characterised in that including plastic draining board, siphon pipe, plate boots, preloading, collection
Well and suction pump;Gutter is excavated in soft soil foundation, gutter is excavated to below level of ground water, and plastic draining is inserted in gutter
Plate, adj acent plastic drain bar spacing is 0.5m-1m, is arranged in blossom type, and plastic draining board plugs depth for 12m, plastic draining
The length of plate is 5m, and the plate boots with plastic draining board phase same material, siphon are installed in one end of plastic draining board insertion soft soil foundation
In the water inlet insertion plastic draining board of pipe, the delivery port of siphon pipe is extend into the sump near soft soil foundation, collection
Well depth is 20m, and suction pump is placed at the well head 1m of sump, banketed in gutter, is placed on soft soil foundation surface
Preloading.
2. a kind of soft foundation discharge fixing system according to claim 1, it is characterised in that siphon in the sump
The water outlet height of pipe is more than the water inlet open height of siphon pipe in plastic draining board.
3. a kind of soft foundation discharge fixing system according to claim 1, it is characterised in that the siphon pipe is from interior
Footpath 4mm PU pipes.
4. a kind of soft foundation discharge fixing method, it is characterised in that comprise the following steps:
(1) gutter is excavated in soft soil foundation, gutter is excavated to below level of ground water, and the water inlet of siphon pipe is fixed on plastics
In drain bar, siphon pipe is managed from internal diameter 4mm PU, is installed and plastic draining board phase same material in one end of plastic draining board
Plate boots;Plastic draining board is inserted in gutter using mechanization board-plugging device, board-plugging device is extracted, plastic draining board is embedded in weak soil
Inside ground, it is 5m to be embedded in the plastic draining board length inside soft soil foundation, and plastic draining board insertion depth is 12m, adjacent
Plastic draining board spacing is 0.5m-1m, is arranged in blossom type;
(2) in the neighbouring setting sump of pending soft soil foundation, a diameter of 1m of sump, well depth of catchmenting is 20m, is owned
The siphon pipe of insertion plastic draining board is tiled in gutter, and its delivery port is extend into sump together, siphon pipe in sump
Water outlet height be more than plastic draining board in siphon pipe water inlet open height;
(3) banketed in gutter, preloading is then placed on soft soil foundation surface, heap loading capacity should be greater than being equal to design load;
(4) start suction pump to draw water, the water in sump is drained, siphon drainage effect occurs, and the water in soft soil foundation is by rainbow
Suction pipe is flowed into sump, and the water level in sump rises, and when the water level in sump no longer changes, is again started up taking out
Water pump.
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Cited By (6)
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CN108330946A (en) * | 2018-04-13 | 2018-07-27 | 范雲鹤 | A kind of maintenance by gas pressuriztion formula soft soil foundation drainage system |
CN108612078A (en) * | 2018-05-08 | 2018-10-02 | 河海大学 | A kind of method that cathode bubble is eliminated in electro-osmosis method reinforcing flexible foundation |
CN108691310A (en) * | 2018-06-21 | 2018-10-23 | 中国华电科工集团有限公司 | A kind of soft foundation discharge fixing system and method |
CN109778833A (en) * | 2019-03-13 | 2019-05-21 | 秦山伟业建设集团有限公司 | A kind of seabeach of enclosing of jackstone in conjunction with flexiplast drain bar applies roadbed construction method |
CN111535293A (en) * | 2020-03-05 | 2020-08-14 | 东南大学 | Method and system for reinforcing deep soft foundation by combining low-level water-lowering vacuum with surcharge preloading |
CN114541448A (en) * | 2022-04-06 | 2022-05-27 | 中国建筑一局(集团)有限公司 | Be used for foundation ditch earth's surface water to fall and arrange gravity type siphon device |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108330946A (en) * | 2018-04-13 | 2018-07-27 | 范雲鹤 | A kind of maintenance by gas pressuriztion formula soft soil foundation drainage system |
CN108612078A (en) * | 2018-05-08 | 2018-10-02 | 河海大学 | A kind of method that cathode bubble is eliminated in electro-osmosis method reinforcing flexible foundation |
CN108612078B (en) * | 2018-05-08 | 2020-12-01 | 河海大学 | Method for eliminating cathode bubbles in electroosmosis method reinforced soft foundation |
CN108691310A (en) * | 2018-06-21 | 2018-10-23 | 中国华电科工集团有限公司 | A kind of soft foundation discharge fixing system and method |
CN109778833A (en) * | 2019-03-13 | 2019-05-21 | 秦山伟业建设集团有限公司 | A kind of seabeach of enclosing of jackstone in conjunction with flexiplast drain bar applies roadbed construction method |
CN111535293A (en) * | 2020-03-05 | 2020-08-14 | 东南大学 | Method and system for reinforcing deep soft foundation by combining low-level water-lowering vacuum with surcharge preloading |
CN114541448A (en) * | 2022-04-06 | 2022-05-27 | 中国建筑一局(集团)有限公司 | Be used for foundation ditch earth's surface water to fall and arrange gravity type siphon device |
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