CN100443668C - Large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method - Google Patents
Large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method Download PDFInfo
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- CN100443668C CN100443668C CNB2006100861398A CN200610086139A CN100443668C CN 100443668 C CN100443668 C CN 100443668C CN B2006100861398 A CNB2006100861398 A CN B2006100861398A CN 200610086139 A CN200610086139 A CN 200610086139A CN 100443668 C CN100443668 C CN 100443668C
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Abstract
The present invention relates to a stratified time-after-time electroosmotic precipitation combined vacuum precipitation method for treating large-area soft ground base. It is characterized by that on the large-area soft ground base a stratified time-after-time electroosmotic precipitation combined vacuum precipitation method is adopted, the described stratified precipitation is characterized by that in the deep layer an electroosmotic well-point pipe electroosmotic precipitation is adopted, and in the shallow layer a vacuum well-point pipe evacuation precipitation is adopted; the described time-after-time precipitation is characterized by that in the area where the deep-layer electroosmotic well-point pipe precipitation is adopted in last-time precipitation construction the above-mentioned shallow-layer vacuum well-point pipe precipitation is adopted in the next-time precipitation construction; and in the area where the shallow-layer vacuum well-point pipe precipitation is adopted in last-time precipitation construction the above-mentioned deep-layer electroosmotic well-point pipe precipitation is adopted in the next-time precipitation construction.
Description
Technical field:
The present invention relates to a kind of flexible foundation treatment method, relate in particular to a kind of large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method.Be applicable to the soft foundation processing.Possession base processing technology field.
Background technology:
At present, in the large-area soft foundation dewatering construction, often adopt single vacuum-dewatering, light well point precipitation and electroosmosis dewatering method.In construction, there is following defective in single dewatering construction method:
One, vacuum well-point dewatering
This method is only applicable to coefficient of permeability K 〉=1 * 10
-4The large tracts of land dewatering construction of the above soil property of cm/s is because its dropdown curve is more smooth, when soil property coefficient of permeability K 〉=1 * 10
-4The precipitation effect is that light well point precipitation is incomparable during cm/s.Yet because more smooth these characteristics of its dropdown curve make its effective range of vacuum-dewatering about the 3.0m of top layer, 3.0M seems powerless with next.Simultaneously, because it is applicable to coefficient of permeability K 〉=1 * 10
-4The soil property precipitation of cm/s, therefore, to coefficient of permeability K≤1 * 10
-4Its poor effect of soil property precipitation of cm/s can't reach the required optimum moisture content index of dynamic consolidation.
Two, light well point precipitation
Because its dropdown curve is steeper, this method is usually used in excavation of foundation pit and coefficient of permeability K 〉=1 * 10
-4Reduce underground water in the cm/s construction, and excavation of foundation pit is different from the large tracts of land consolidation process, does not need the power extruding, so its water content is less demanding.And in the construction of large tracts of land dynamic reinforcement, because the soil property water content is higher, so this method is not adopted by the expert.
Three, electric osmose well-points dewatering
The electric osmose well-points dewatering is suitable for coefficient of permeability K≤6 * 10
-6The mucky soil precipitation of cm/s, by the groundwater table in the electric osmose well-points dewatering reduction construction area, make the water content of the soil body in the reinforcing scope reach the optimum moisture content that satisfies dynamic consolidation construction, utilize behind the vacuum electroosmosis stream to mould shape mud and may be formed into these characteristics of any form under external force, activate hydrone by applying electric osmose (external force), by drawing water, make it to become semi-solid state or solid-state.Simultaneously, when plastic state becomes semisolid, the shape invariance of soil, because the effect of electroosmosis dewatering, the volume of soil reduces to shrink because of moisture content, particularly after soil body water further reduced, soil was transformed into solid-state by semisolid, thereby reaches fixed effect.Behind electroosmosis dewatering, after the mucky soil body changes concretion state into, the soil body of need process range is taked the dynamic consolidation method.
This method in practice, only to below the 3.0m of the face of land effectively, and high more to water content, the mucky soil that transmission coefficient is more little is effective.And to top layer and coefficient of permeability K 〉=1 * 10
-4Its effect is also not as the vacuum well-point dewatering ideal in the large tracts of land dewatering construction of the above soil property of cm/s.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, provide a kind of and all can handle and handle equilibrium, easy construction, short construction period, large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method that cost performance is high heteroid soil property situation in the zone.
The object of the present invention is achieved like this: a kind of large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method is characterized in that: it is to adopt layering to divide all over the electroosmosis dewatering union vacuum precipitation, wherein on the large tracts of land subgrade:
Layering precipitation is meant: deep layer is arranged electric osmose well point pipe electroosmosis dewatering, and shallow-layer arranges that the vacuum well point pipe vacuumizes precipitation, and deep layer electric osmose well point pipe is arranged at interval with shallow-layer vacuum well point pipe;
Divide all over precipitation and be meant: lastly in a back dewatering construction, adopts shallow-layer vacuum well point pipe precipitation, and lastly in a back dewatering construction, adopt deep layer electric osmose well point to manage precipitation all over the zone of adopting shallow-layer vacuum well point pipe precipitation in the dewatering construction all over the zone of adopting deep layer electric osmose well point pipe precipitation in the dewatering construction.
Large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method of the present invention, the specific embodiment of this method is:
A), first pass electric osmose, vacuum-dewatering well point stringing
Deep layer electric osmose well point pipe is arranged: deep layer is arranged negative electrode well point pipe and anode stub, and anode stub places between the adjacent two negative electrode well point pipes, adopts electroosmosis dewatering;
Shallow-layer vacuum well point pipe is arranged: shallow-layer is arranged the vacuum well point pipe, and shallow-layer vacuum well point pipe is arranged in the middle of the pipe of two row deep layer electric osmose well points, adopts vacuum-dewatering,
B), second time electric osmose, vacuum-dewatering well point stringing
The same first pass of stringing mode of second time shallow-layer vacuum well point pipe, deep layer electric osmose well point pipe, but the position of stringing and first pass stringing position are alternately, promptly, lay shallow-layer vacuum well point pipe second time, adopt vacuum-dewatering in the position of first pass deep layer electric osmose well point pipe stringing; The position of first pass shallow-layer vacuum well point pipe stringing is laid deep layer electric osmose well point pipe second time, adopts electroosmosis dewatering.
Compare with electric osmose well-points dewatering, vacuum well-point dewatering job practices that existing single large tracts of land dewatering construction is adopted, the present invention has following advantage:
1, to heteroid soil property situation in the zone, all can carry out the dewatering construction method of consolidation process by this law by the well-points dewatering of electric osmose well-points dewatering combined vacuum, pipe associating shallow-layer well point, deep layer electric osmose well point pipe, adjust length dark, shallow well point pipe, can reach by deep layer electric osmose well point pipe electroosmosis dewatering the little mucky soil of transmission coefficient and to apply the required optimum moisture content of power, the opaque sandy soil bigger to transmission coefficient then can reach optimum moisture content by the vacuum-dewatering of shallow-layer well point pipe.
2, easy construction can be adjusted precipitation scope and precipitation time arbitrarily according to different soil properties and different precipitation requirement
This is that single construction technology is beyond one's reach, by dividing all over precipitation, first pass electroosmosis dewatering zone deep layer reach soft mould concretion state after, its second around reason is taked vacuum-dewatering, has therefore saved electric energy, can reach every index fast again.In first pass shallow-layer vacuum-dewatering zone, handle the deep layer mucky soil owing to still need, therefore take to carry out the deep layer electroosmosis dewatering second time, make this subregion reach soft and mould until concretion state.
3, form the equilibrium treatment of vertical plane, it handles depth-adjustment
In the large tracts of land dewatering construction of routine, the vacuum well-point dewatering of now taking only can be handled top layer 3.0m scope, and the deep layer effect is unsatisfactory.And the electric osmose well-points dewatering, (the following scope of 3.0m under the top layer, the top layer is unsatisfactory then only to handle deep layer.And the advantage by the comprehensive vacuum well-point dewatering of this law and electric osmose well-points dewatering makes it to reach the equilibrium treatment on the vertical plane, and by regulating the scope of well point length of tube, suction filter, it handles degree of depth can reach 10.0m.
4, short construction period, cost performance height
This job practices has been owing to taked the electroosmosis dewatering union vacuum precipitation to use, thus the reduction that makes groundwater table in the construction area by dark, Each performs its own functions for the shallow-layer pipe, the water content of 4.0m scope is responsible for by the shallow-layer pipe under the face of land; Then by electric osmose well point pipe (negative electrode), anode stub respectively connects current supply circuit to deep layer mud, strengthens the transmission coefficient of mucky soil by electric osmose, principle of electrophoresis, and is aided with (negative electrode) vacuum dehydration, reaches fixed.Therefore, effectiveness is given full play in each layer well point, has accelerated construction period, simultaneously, because the stringing density of electric osmose well point pipe reduces, and has saved electric energy, construction cost is descended, quality improves, and the soft foundation after the reinforcing forms " crust layer " of 10.0m scope, and its cost performance improves greatly.
Use this technology, can guarantee the optimum moisture content index that dynamic reinforcement is required, the layout electroosmosis dewatering well point that can divide time by control hierarchy again, the vacuum-dewatering well point guarantees that the precipitation passage links up, and saves cost.Can enlarge the influence basin of electroosmosis dewatering again, the whole processing region that needs is divided all over reaching best behind the electroosmosis dewatering and be uniform water content by layering, for the dynamic reinforcement soft foundation particularly the bearing capacity of mucky soil improve and create conditions.By the application of this method, for improving bearing capacity, soft foundation creates conditions, in conjunction with applying power, make it to reach the bearing capacity of designing requirement repeatedly.Be particularly suitable for the consolidation process under mucky soil and the complex geological condition.
Description of drawings
Fig. 1 is a construction technique schematic diagram of the present invention.
Among the figure: peripheral tube sealing 1, open drain 2, shallow-layer pipe vacuum dehydration pump 3, electroosmosis dewatering instrument 4, deep layer pipe vacuum dehydration pump 5.
The specific embodiment
Referring to Fig. 1, large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method of the present invention, this method specific embodiment is as follows:
One, layering
According to the construction area of required reinforcing, by each sub-district 5000～10000m
2Divide, arrange deep layer electric osmose well point pipe and shallow-layer vacuum well point pipe
1, deep layer electric osmose well point pipe (electroosmosis dewatering well casing) is set
A) negative electrode well point pipe is set: the buried depth according to mucky soil is provided with the length of negative electrode well point pipe and the filter scope that absorbs water, and general negative electrode well point pipe is taked Φ 32mm, pipe range 6.0m, the long 1.5～2.0m of filter.
B) anode stub is set
After the concrete data of setting negative electrode well point pipe, according to the data of negative electrode well point pipe, set anode stub, the anode stub reinforcing bar of Φ 25mm, its length is than the long 1.0m in negative electrode well point.
Deep layer electric osmose well point is set, and to manage that it mainly acts on be to handle the deep layer mucky soil.
2, shallow-layer vacuum well point pipe (vacuum-dewatering well casing) is set
Shallow-layer well point pipe can be taked iron pipe or nylon tube, Φ 32mm, pipe range 4.0m, the long 1.0 ~ 1.5m of filter.
The shallow-layer vacuum well point is set manages the underground water that its effect mainly is a 4.0m scope under the extraction face of land.
Two, divide time
According to the branch time concretion method of geological conditions and design reinforcement, in the large tracts of land electroosmosis dewatering is constructed in conjunction with electroosmosis dewatering, can take branch all over precipitation, its construction technology is as follows:
1, first pass electric osmose, vacuum-dewatering well point stringing
A) deep layer electric osmose well point pipe is arranged: negative electrode well point pipe pipe is apart from be 2.0m, and anode stub places between the adjacent two negative electrode well point pipes, with the cathode tube spacing be 1.0m, pipe interval, two row deep layer electric osmose well points array pitch is 6.0m.In practice of construction, can adjust its spacing and array pitch according to the soil property situation.Arrange that it is to handle the deep layer mucky soil that deep layer electric osmose well point manages that it mainly acts on.
B) shallow-layer vacuum well point pipe is arranged: pipe is apart from 4.0m, and array pitch 6.0m, shallow-layer vacuum well point pipe are arranged in the middle of the pipe of two row deep layer electric osmose well points, adopt vacuum-dewatering.In practice of construction, can adjust its spacing and array pitch according to the soil property situation.
The first pass precipitation time is according to the soil property situation, and dynamic reinforcement is carried out in tube pulling after reaching optimum moisture content.
2, second time electric osmose, vacuum-dewatering well point stringing
The stringing method of deep layer electric osmose well point pipe, shallow-layer vacuum well point pipe is with first pass electric osmose, vacuum-dewatering well point stringing, but the position of stringing and first pass stringing position arranged alternate.
Promptly, lay shallow-layer vacuum well point pipe second time in the position that first pass deep layer electric osmose well point pipe is arranged; First pass is laid the position of shallow-layer vacuum well point pipe, lays deep layer electric osmose well point pipe second time.
Because the influence basin behind electroosmosis dewatering after this replaces stringing precipitation, can be guaranteed the balanced precipitation of deep layer mucky soil at 5.0～10.0m, can take into account the optimum moisture content that shallow surface soil applies power again simultaneously.
In the construction of soft soil treatment of peripheral abundant water, can be by adding peripheral tube sealing, with the intrusion (accompanying drawing 1) of the peripheral water of shutoff in conjunction with the open drain.In the large tracts of land treatment of soft foundation, peripheral tube sealing electricity consumption seepage well point pipe arranges that the precipitation that forms by electric osmose encloses curtain, and the peripheral water source of shutoff guarantees that construction area carries out consolidation process under the optimum moisture content state.
In construction, can be according to different geological conditionss and different transmission coefficients to electroosmosis dewatering, vacuum-dewatering, deep layer electric osmose well point pipe, shallow-layer vacuum well point pipe are adjusted, and also can adjust by electroosmosis dewatering time, vacuum-dewatering time simultaneously, to obtain different precipitation requirements.
Claims (3)
1, a kind of large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method is characterized in that: it is to adopt layering to divide all over the electroosmosis dewatering union vacuum precipitation, wherein on the large tracts of land subgrade:
Layering precipitation is meant: deep layer is arranged electric osmose well point pipe electroosmosis dewatering, and shallow-layer arranges that the vacuum well point pipe vacuumizes precipitation, and deep layer electric osmose well point pipe is arranged at interval with shallow-layer vacuum well point pipe;
Divide all over precipitation and be meant: lastly in a back dewatering construction, adopts shallow-layer vacuum well point pipe precipitation, and lastly in a back dewatering construction, adopt deep layer electric osmose well point to manage precipitation all over the zone of adopting shallow-layer vacuum well point pipe precipitation in the dewatering construction all over the zone of adopting deep layer electric osmose well point pipe precipitation in the dewatering construction.
2, a kind of large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method according to claim 1, it is characterized in that: the specific embodiment of this method is:
A), first pass electric osmose, vacuum-dewatering well point stringing
Deep layer electric osmose well point pipe is arranged: deep layer is arranged negative electrode well point pipe and anode stub, and anode stub places between the adjacent two negative electrode well point pipes, adopts electroosmosis dewatering;
Shallow-layer vacuum well point pipe is arranged: shallow-layer is arranged the vacuum well point pipe, and shallow-layer vacuum well point pipe is arranged in the middle of the pipe of two row deep layer electric osmose well points, adopts vacuum-dewatering,
B), second time electric osmose, vacuum-dewatering well point stringing
The same first pass of stringing mode of second time shallow-layer vacuum well point pipe, deep layer electric osmose well point pipe, but the position of stringing and first pass stringing position are alternately, promptly, lay shallow-layer vacuum well point pipe second time, adopt vacuum-dewatering in the position of first pass deep layer electric osmose well point pipe stringing; The position of first pass shallow-layer vacuum well point pipe stringing is laid deep layer electric osmose well point pipe second time, adopts electroosmosis dewatering.
3, a kind of large area soft ground treatment separated layer and time electroosmotic precipitation union vacuum precipitation method according to claim 2, it is characterized in that: negative electrode well point pipe pipe is apart from being 2.0m, caliber Φ 32mm, pipe range 6.0m, long 1.5～the 2.0m of filter, the anode stub reinforcing bar of Φ 25mm, its length is than the long 1.0m in negative electrode well point, spacing between anode stub and the adjacent negative electrode well point pipe is 1.0m, and two row deep layer electric osmose well points pipe array pitch at interval is 6.0m; Shallow-layer vacuum well point pipe is taked iron pipe or nylon tube, and caliber Φ 32mm, pipe range 4.0m, the long 1.0～1.5m of filter, the pipe of vacuum well point pipe be apart from 4.0m, array pitch 6.0m.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101225658B (en) * | 2008-02-18 | 2010-06-09 | 张志铁 | Soft soil foundation consolidation method |
| CN101831903B (en) * | 2010-05-18 | 2012-02-08 | 上海港湾软地基处理工程(集团)有限公司 | Method for treating soft foundation |
| CN102345294A (en) * | 2010-08-04 | 2012-02-08 | 天津一建建筑工程有限公司 | Graded dewatering structure for soft-soil foundation deep-pit earthwork excavation |
| CN106192982B (en) * | 2016-07-11 | 2019-05-31 | 河海大学 | A method of the electric osmose soil stake based on tubulose ekg electrode handles soft base |
| CN108978693B (en) * | 2017-05-06 | 2021-07-23 | 中建五局华东建设有限公司 | Foundation pit engineering soft soil foundation dewatering construction structure |
| CN107100182A (en) * | 2017-05-17 | 2017-08-29 | 福建岩土工程勘察研究院 | Soft foundation cluster type layering precipitation no-arbitrary pricing pipe rams system and its construction method |
| CN112878308B (en) * | 2021-01-18 | 2022-07-22 | 江苏鑫泰岩土科技有限公司 | High-load ultralow-position precipitation vacuum preloading method |
| CN115045312A (en) * | 2022-05-25 | 2022-09-13 | 济南轨道交通集团有限公司 | Vacuum electroosmosis combined type foundation pit drainage system and application method thereof |
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| JP2000319865A (en) * | 1999-05-11 | 2000-11-21 | Fudo Constr Co Ltd | Soil reinforcing complex method |
| JP2002242171A (en) * | 2001-02-16 | 2002-08-28 | Hazama Gumi Ltd | Foundation improvement work by vacuum consolidation and working construction therefor |
| CN1609345A (en) * | 2004-11-25 | 2005-04-27 | 徐士龙 | High vacuum variable energy cross soft foundation treatment method |
| CN1221713C (en) * | 2004-03-09 | 2005-10-05 | 徐土龙 | Method of processing soft foundation by quick low position high vacuum layering pre-compacting consolidation |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000319865A (en) * | 1999-05-11 | 2000-11-21 | Fudo Constr Co Ltd | Soil reinforcing complex method |
| JP2002242171A (en) * | 2001-02-16 | 2002-08-28 | Hazama Gumi Ltd | Foundation improvement work by vacuum consolidation and working construction therefor |
| CN1221713C (en) * | 2004-03-09 | 2005-10-05 | 徐土龙 | Method of processing soft foundation by quick low position high vacuum layering pre-compacting consolidation |
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