CN103205961A - Asynchronous vacuum water-sucking preloading method for ultra-soft soil - Google Patents
Asynchronous vacuum water-sucking preloading method for ultra-soft soil Download PDFInfo
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Abstract
The invention relates to an asynchronous vacuum water-sucking preloading method for ultra-soft soil. Due to characteristics of the ultra-soft soil (especially soil with much cohesive content), after the ultra-soft soil is treated by the conventional vacuum preloading method of using drainage pipelines with the same vacuum degree at the same time for a while, cohesive soil particles are gathered at drainage channels and neighboring areas to block drainage systems, and accordingly project consolidation effect, duration and cost are all affected. The asynchronous vacuum water-sucking preloading method includes that asynchronous vacuum control is performed on interval connection of the drainage pipelines and the drainage pipelines, different negative pressure is exerted on adjacent vertical drainage bodies simultaneously to prevent peripheral cohesive particles of the drainage bodies under the same negative pressure from gathering evenly in the same direction, so that blocking of the ultra-soft soil in the vacuum preloading process can be relieved, blocking time of the drainage pipelines can be delayed, and vacuum preloading effect can be improved. The method is simple in process and convenient to apply, and can be used for practical projects.
Description
One, technical field
The present invention is a kind of vacuum method of ultra-soft soil, particularly water discharging body is applied simultaneously the vacuum preloading method of different vacuums, is applicable to that engineering is handled in the consolidation draining precompressed of ultra-soft soil.
Two, background technology
Along with China's beach is enclosed and cultivated the development of building cause, especially after China " 12 " planning outline proposes to advance the marine economy development, must promote for the requirement of border on the sea land-based area area and development rate, wherein enclose and cultivate is one of major measure with making.The ocean beach is enclosed and cultivated used most of barged-in fill and is had characteristics such as the low and poor permeability of water content height, intensity, handle so must make corresponding ground when carrying out infrastructure in enclosing and cultivating land-based area, what existing super soft ground processing methods such as barged-in fill were the most commonly used is vacuum method.This method is at barged-in fill (sand) vertical plastic draining board to be set, sanding bed course or horizontal drainage body thereon, adopt diaphragm seal that it is sealed again, and adopt jet pump to bleed to make that sand cushion or horizontal drainage body, vertical plastic draining board etc. are in the partial vacuum state under the film, discharge the part pore water in the soil, accelerate soil solidifying, and then improve soil strength, reduce settlement after construction.Vacuum method is able to extensive use because need not advantages such as preloading filler, precompressed duration be short, becomes in China and even the world wide ultra-soft soil method for processing foundation the most commonly used such as barged-in fill.
Simultaneously, demand for development for the foundation treatment technology of ultra-soft soil in reply China project of cultivation, by the improvement to the traditional vacuum preloading method, now derived the multiclass technique of soft soil foundation treatment, as meta vacuum method, low position vacuum preloading method, directly discharging type vacuum prepressing method etc., said method realizes reducing the construction period by changing thinkings such as horizontal vacuum transfer layer position, change water discharging body syndeton form and upper strata sealing system, reduces construction cost, and has obtained certain effect.
But just practice at present, ultra-soft soil such as barged-in fill are underconsolidated soil because of it, do not form stable grogs skeleton as yet, applying the migration that soil particle easily takes place under the external load function, as producing the soil particle phenomenon of migration downwards in the consolidation process of ultra-soft soil under the gravity effect.In the vacuum preloading process, by drainage channel ultra-soft soil such as barged-in fill are applied unified negative pressure after, soil particle can move toward the water discharging body direction, forms fine and close soil (mud) layer, make water discharging body around the soil layer transmission coefficient diminish, hinder follow-up prepressing water discharge process.Facts have proved, the silting phenomenon of water discharging body surrounding soil mostly occurs in ultra-soft soil vacuum preloading process, produce phenomenons such as consolidation effect is inhomogeneous, later stage drainage effect difference, " soil stake " phenomenon that wherein adopts vacuum preloading processing barged-in fill to produce is the most representative.
For addressing the above problem, mainly need to solve the silting phenomenon in the vacuum preloading process, can realize from the improvement of drainage channel and the control of vacuum.For the improvement of drainage channel, plate core, filter membrane and bonding mode thereof that major measure concentrates on plastic draining board improve, in the hope of postponing and alleviate time and the degree of silting generation.But under plastic draining board tensile strength required, the improvement of its plate core and filter membrane also was subjected to certain limitation, failed the silting problem of fine solution punishment band drain; For the moulding of plastic strip plate and the improvement of bonding mode, solved the plate in-core silting that causes because of factors such as itself moulding slits to a certain extent, but with regard to the more ultra-soft of viscous fine particle content was native, this kind improvement was less to the influence of filter membrane silting.For the control of vacuum in the vacuum preloading process, existing ventilative vacuum silt prevention method, the anti-blocking vacuum method of superpressure etc. of being mainly.The former handles object mainly is mud, and need set up the quick water and soil separation that drainage pipeline networks carries out mud in advance, and the ground that is unsuitable for barged-in fill is handled; The latter is by the increase of direct-discharging drainage channel structure and pressure inlet realization negative pressure, but the stickiness particle in the ultra-soft soil still can move to the band drain direction under the high negative pressure effect, and corresponding silting blocking measure is not namely arranged.
In sum, according to present actual conditions and technical condition, need the asynchronous vacuum dehydration preloading of a kind of ultra-soft soil of invention badly, reach the silting time of postponing drainage pipe and near the soil body, improve the vacuum preloading treatment effect, realize the silting blocking punishment effect under ultra-soft soil " the asynchronous vacuum conditions draining " new approaches.
Three, summary of the invention
The control that differs from existing vacuum method vacuum is arranged, the purpose of the method for the present invention is that is by applying different negative pressure of vacuum simultaneously to water discharging body, make soil particle move left and right in drainage procedure, rather than in the past towards fixing water discharging body direction one-way movement, alleviate or eliminate because applying the silting that the directed uniform migration of soil particle under the identical vacuum degree condition causes water discharging body simultaneously, thereby postpone the silting time of drainage pipe and near the soil body, solve the problem of the too early silting of drainage channel that causes because of the earth material migration in the existing vacuum preloading process, namely by the difference of water discharging body vacuum being selected and the interval of water discharging body connects, difference is regulated when realizing the vertical drainage body vacuum etc. in the vacuum preloading process.
In order to realize above-mentioned purpose, the present invention has adopted following technical scheme:
The asynchronous vacuum dehydration preloading of a kind of ultra-soft soil, it is characterized in that when identical, inscribing and adopt that the horizontal drain pipe of different vacuums makes the negative pressure of vacuum that formation varies in size in the adjacent vertical drainage body more than 2 kinds or 2 kinds, wherein the interior vacuum degree control of the horizontal drain pipe of condition of high vacuum degree is at 70～80kPa, vacuum degree control is at 20～30kPa in the horizontal drain pipe of rough vacuum, and the vacuum difference value remains between 30～60kPa in the gutter of different vacuums; Vertical drainage body produces different big or small negative pressure by the connection of horizontal drain pipe, to the precompressed that absorbs water of the pending soil body, variation according to the horizontal drain pipe water yield, by vacuum in the horizontal drain pipe of vacuum in the horizontal drain pipe that increases rough vacuum and minimizing condition of high vacuum degree, realization is regulated the height circulation of vacuum in the horizontal drain pipe, drainage rates until each horizontal drain pipe is close, again horizontal drain pipe is applied identical vacuum and carries out vacuum preloading.
The asynchronous vacuum dehydration preloading of ultra-soft soil according to claim 1 is characterized in that mentioned horizontal drain pipe adopts plastic pipe or steel pipe; Vertical drainage body is selected plastic draining board or draining chimney filter for use.
The asynchronous vacuum dehydration preloading of ultra-soft soil according to claim 1, the height circulation that it is characterized in that vacuum in the described horizontal drain pipe is regulated, refer under the different prerequisite of the vacuum that guarantees the adjacent vertical drainage body of synchronization, the circulation that is adjusted to vacuum in the horizontal drain pipe is carried out, and vacuum is in the pipe: high (low) value-low (height) value-Gao (low) value-low (height) value; When the height circulation was regulated, its single amplitude of accommodation was 20～30kPa.
The asynchronous vacuum dehydration preloading of ultra-soft of the present invention soil is different from the traditional vacuum precompressed water discharging body is applied the method for same vacuum, and the advantage in super soft grounds such as barged-in fill are handled is:
1. alleviate the silting phenomenon in the empty precompressed process of ultra-soft soil significantly, the soil solidifying degree behind the raising vacuum preloading.Because the self-characteristic (the especially more soil body of stickiness content) of ultra-soft soil, the gathering of drainage channel and near stickiness grogs thereof can take place in the employing traditional vacuum after precompressed processing a period of time, cause the silting of drainage system, hinder the process of soil solidifying draining, influence duration of a project and treatment effect.After adopting asynchronous vacuum dehydration preloading, by the asynchronous vacuum control to water discharging body, realize that adjacent vertical drainage body applies different negative pressure simultaneously, soil particle is moved back and forth rather than towards fixing water discharging body direction one-way movement in drainage procedure, avoid in the traditional vacuum preloading method the directed uniform gathering because of water discharging body periphery soil particle under the identical condition of negative pressure effect, and then alleviate the silting phenomenon of ultra-soft soil in the vacuum preloading process, postpone the silting time of drainage pipe.
2. treatment effect and the uniformity of the asynchronous vacuum dehydration preloading of ultra-soft soil are better.Adopt the asynchronous vacuum dehydration preloading of ultra-soft soil, can from the soil body, discharge more pore water, improve the average degree of consolidation of ultra-soft soil such as barged-in fill; Because avoiding the directed uniform gathering of the glutinous grain of water discharging body periphery, can realize the uniformity that soil body processing back soil strength strengthens simultaneously.
3. it is low to improve implementation cost.The interval that only needs to carry out on the basis of existing directly discharging type vacuum prepressing method drainage pipe connects and the asynchronous vacuum control of drainage pipe gets final product, and corrective measure is simple and expense is low.
Four, description of drawings
Fig. 1 is that the two vacuums of the asynchronous vacuum dehydration preloading of ultra-soft soil are arranged schematic diagram;
Fig. 2 is that the many vacuums of the asynchronous vacuum dehydration preloading of ultra-soft soil are arranged schematic diagram;
Fig. 3 is that the many vacuums of the asynchronous vacuum dehydration preloading of ultra-soft soil are regulated schematic diagram;
Wherein, 1-vertical drainage body; The 2-tube connector; The horizontal drain pipe of 3-rough vacuum; The drain header of 4-rough vacuum; The horizontal drain pipe of 5-condition of high vacuum degree; The drain header of 6-condition of high vacuum degree; The 7-flow meter; 8-regulates vacuum equipment and vacuum pump; The horizontal drain pipe of vacuum among the 9-; The drain header of vacuum among the 10-; 11-geotextiles and diaphragm seal.
Five, specific implementation method
The asynchronous vacuum dehydration preloading of ultra-soft soil is carried out treatment of soft foundation, adopts the concrete layout of two vacuums, implementation method as shown in Figure 1:
(1) horizontal pipe connects.According to designing requirement, set vertical drainage body 1(and mostly be plastic draining board), by shown in Figure 1, adopt PVC tube connector 2 that vertical drainage body 1 is linked to each other at interval with the horizontal drain pipe 3 of rough vacuum, the horizontal drain pipe 5 of condition of high vacuum degree.The horizontal drain pipe 3 of rough vacuum, the horizontal drain pipe pipe 5 of condition of high vacuum degree are tightly connected with the drain header 4 of rough vacuum, the drain header 6 of condition of high vacuum degree respectively, and the drain header 4 of condition of high vacuum degree,, drain header 6 water sides of rough vacuum install fluid flowmeter 7, be connected with adjusting vacuum equipment and vacuum pump 8 then, the horizontal pipe that forms the asynchronous vacuum dehydration preloading of ultra-soft soil connects.
(2) the vacuum preloading sealing is disposed.Lay geotextiles and diaphragm seal 11 at horizontal pipe, and be pressed into and close on the sealing ditch, finish the regional seal of vacuum pre-pressed soft soil foundation and dispose.
(3) turn on pump vacuumizes precompressed.Open vacuum pump, by regulating the vacuum that vacuum equipment is regulated different pipelines.Starting stage, at 20～30kPa, the vacuum degree control in the drain header 6 of condition of high vacuum degree was carried out the draining precompressed at 70～80kPa with the vacuum degree control in the drain header 4 of rough vacuum.
(4) carry out the vacuum adjustment according to water yield.By the observational record to water yield in the drain header, when drain discharge takes place obviously to descend, vacuum in each vacuum tube is regulated.Increase the vacuum in the drain header 4 of rough vacuum simultaneously and reduce vacuum in the drain header 6 of condition of high vacuum degree, wherein the vacuum single amplitude of accommodation is 20～30kPa, and the vacuum in the drain header 4 of original rough vacuum is adjusted to 70～80kPa; Vacuum in the drain header 4 of original condition of high vacuum degree is adjusted to 20～30kPa.
(5) implementation step of repeating step (4) is carried out the circulation of vacuum in the horizontal drain pipe and is regulated, and the interior vacuum of pipe is changed to: high (low) value-low (height) value-Gao (low) value-low (height) value.
(6) drain header 4 until rough vacuum is close with the drainage rates of the drain header 6 of condition of high vacuum degree, and ultra-soft soil such as barged-in fill are carried out condition of high vacuum degree precompressed under the identical vacuum, makes draining precompressed effect more even, and soil strength promotes higher.
Adopt the concrete layout enforcement figure of the asynchronous vacuum dehydration preloading of many vacuums as shown in Figure 2, its asynchronous vacuum conditions process can be with reference to the method for two vacuums, turn on pump vacuumizes the precompressed stage, starting stage with the vacuum degree control in the horizontal drain pipe 4 of rough vacuum at 20～30kPa, vacuum degree control in the horizontal drain pipe 10 of middle vacuum is at 40～50kPa, vacuum degree control in the horizontal drain pipe 6 of condition of high vacuum degree is at 70～80kPa, and the vacuum difference value of adjacent drainage channel pipe is to carry out the draining precompressed under 20～30kPa.
Carry out vacuum when adopting the asynchronous vacuum dehydration preloading of many vacuums when regulating, the single amplitude of accommodation is 20～30kPa, reduce the vacuum of the drain header 4 of original condition of high vacuum degree during conciliation, the drain header 10 of vacuum in making it to become, the drain header 10 of the middle vacuum of drain header 6 one sides of original condition of high vacuum degree, the drain header 4 of rough vacuum all raise, and it manages interior vacuum, makes it to become the drain header 10 of the drain header 6 of condition of high vacuum degree, middle vacuum; The drain header 10 of the middle vacuum of drain header 6 opposite sides of original condition of high vacuum degree, the drain header 4 of rough vacuum reduce respectively and rising vacuum, make it to become the drain header 10 of the drain header 4 of rough vacuum, middle vacuum; And the circulation that the above-mentioned implementation step of repeating step is carried out vacuum in the horizontal drain pipe regulates, and is close until the drainage rates of each drain header, again ultra-soft soil such as barged-in fill carried out condition of high vacuum degree precompressed under the identical vacuum.The vacuum of the asynchronous vacuum dehydration preloading of many vacuums is regulated and is changed schematic diagram as shown in Figure 3.
Protection scope of the present invention is not limited to above-described embodiment, and the technical scheme that all employing equivalent transformations form all belongs to protection scope of the present invention.
Claims (3)
1. the asynchronous vacuum dehydration preloading of ultra-soft soil, it is characterized in that when identical, inscribing and adopt that the horizontal drain pipe of different vacuums makes the negative pressure of vacuum that formation varies in size in the adjacent vertical drainage body more than 2 kinds or 2 kinds, wherein the interior vacuum degree control of the horizontal drain pipe of condition of high vacuum degree is at 70～80kPa, vacuum degree control is at 20～30kPa in the horizontal drain pipe of rough vacuum, and the vacuum difference value remains between 30～60kPa in the gutter of different vacuums; Vertical drainage body produces different big or small negative pressure by the connection of horizontal drain pipe, to the precompressed that absorbs water of the pending soil body, variation according to the horizontal drain pipe water yield, by vacuum in the horizontal drain pipe of vacuum in the horizontal drain pipe that increases rough vacuum and minimizing condition of high vacuum degree, realization is regulated the height circulation of vacuum in the horizontal drain pipe, drainage rates until each horizontal drain pipe is close, again horizontal drain pipe is applied identical vacuum and carries out vacuum preloading.
2. the asynchronous vacuum dehydration preloading of ultra-soft soil according to claim 1 is characterized in that mentioned horizontal drain pipe adopts plastic pipe or steel pipe; Vertical drainage body is selected plastic draining board or draining chimney filter for use.
3. the asynchronous vacuum dehydration preloading of ultra-soft according to claim 1 soil, the height circulation that it is characterized in that vacuum in the described horizontal drain pipe is regulated, refer under the different prerequisite of the vacuum that guarantees the adjacent vertical drainage body of synchronization, the circulation that is adjusted to vacuum in the horizontal drain pipe is carried out, and vacuum is in the pipe: high (low) value-low (height) value-Gao (low) value-low (height) value; When the height circulation was regulated, its single amplitude of accommodation was 20～30kPa.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452736A (en) * | 2014-12-05 | 2015-03-25 | 水利部交通运输部国家能源局南京水利科学研究院 | Intermittent vacuum precompression device and soft foundation treatment method of intermittent vacuum precompression device |
| CN105019426A (en) * | 2015-06-19 | 2015-11-04 | 盐城工学院 | Anti-blocking rapid vacuum preloading and solidifying method for flow-state mud with straw as drainage bodies |
| CN105178284A (en) * | 2015-08-31 | 2015-12-23 | 上海交通大学 | Pulsation vacuum preloading drainage device and method of mucky soil soft foundation |
| CN106759237A (en) * | 2016-11-25 | 2017-05-31 | 天津大学 | A kind of vacuum preloading method of alternative expression pumping |
| CN109342292A (en) * | 2018-11-16 | 2019-02-15 | 吉林大学 | A kind of classification vacuum preloading simulating lab test device |
| CN109342292B (en) * | 2018-11-16 | 2024-05-14 | 吉林大学 | Indoor simulation experiment device of hierarchical vacuum preloading |
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| CN101851914A (en) * | 2010-06-09 | 2010-10-06 | 天津大学 | Method for regulating and controlling ventilating transformation and quickly reinforcing dredger fill in vacuum |
| KR20110026550A (en) * | 2009-09-08 | 2011-03-16 | 지에스건설 주식회사 | Two-way suction drain consolidation method for porewater drainage of soft ground |
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| KR20110026550A (en) * | 2009-09-08 | 2011-03-16 | 지에스건설 주식회사 | Two-way suction drain consolidation method for porewater drainage of soft ground |
| CN101851914A (en) * | 2010-06-09 | 2010-10-06 | 天津大学 | Method for regulating and controlling ventilating transformation and quickly reinforcing dredger fill in vacuum |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452736A (en) * | 2014-12-05 | 2015-03-25 | 水利部交通运输部国家能源局南京水利科学研究院 | Intermittent vacuum precompression device and soft foundation treatment method of intermittent vacuum precompression device |
| CN105019426A (en) * | 2015-06-19 | 2015-11-04 | 盐城工学院 | Anti-blocking rapid vacuum preloading and solidifying method for flow-state mud with straw as drainage bodies |
| CN105178284A (en) * | 2015-08-31 | 2015-12-23 | 上海交通大学 | Pulsation vacuum preloading drainage device and method of mucky soil soft foundation |
| CN106759237A (en) * | 2016-11-25 | 2017-05-31 | 天津大学 | A kind of vacuum preloading method of alternative expression pumping |
| CN109342292A (en) * | 2018-11-16 | 2019-02-15 | 吉林大学 | A kind of classification vacuum preloading simulating lab test device |
| CN109342292B (en) * | 2018-11-16 | 2024-05-14 | 吉林大学 | Indoor simulation experiment device of hierarchical vacuum preloading |
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