CN103205961B - 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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- CN103205961B CN103205961B CN201310096244.XA CN201310096244A CN103205961B CN 103205961 B CN103205961 B CN 103205961B CN 201310096244 A CN201310096244 A CN 201310096244A CN 103205961 B CN103205961 B CN 103205961B
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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, and engineering is processed in the consolidation draining precompressed that is applicable to ultra-soft soil.
Two, background technology
Along with the development of China's Tidal Flat Reclamation building cause, especially propose to advance after marine economy development in China " 12 " planning outline, 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.Marine shoal encloses and cultivates that most of barged-in fill used has that water content is high, intensity is low and the feature such as poor permeability, so must make corresponding ground processing enclosing and cultivating while carrying out infrastructure in land-based area, what the super soft ground processing methods such as existing barged-in fill were the most conventional is vacuum method.This method is, at barged-in fill (sand), vertical plastic draining board is set, sanding bed course or horizontal drainage body thereon, adopt again diaphragm seal to seal it, and adopt jet pump to bleed to make under film sand cushion or horizontal drainage body, vertical plastic draining board etc. in partial vacuum state, discharge the part pore water in soil, accelerate soil solidifying, and then improve soil strength, reduce settlement after construction.Vacuum method is because being able to extensive use without preloading filler, precompressed duration compared with the advantage such as short, becomes the method for processing foundation that the ultra-soft soil such as barged-in fill in China and even world wide are commonly used the most.
Simultaneously, for the demand for development of the foundation treatment technology of ultra-soft soil in reply China project of cultivation, by the improvement to traditional vacuum preloading method, now derive 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 is realized the minimizing construction period by changing the 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, the ultra-soft soil such as barged-in fill are underconsolidated soil because of it, ultra-soft soil not yet forms stable grogs skeleton, applying the migration that soil particle easily occurs under external load function, as will be produced the soil particle phenomenon of migration downwards in the consolidation process under Action of Gravity Field.In vacuum preloading process; by drainage channel, the ultra-soft soil such as barged-in fill are applied after unified negative pressure, soil particle can move toward water discharging body direction, forms fine and close soil (mud) layer; around making water discharging body, soil layer transmission coefficient diminishes, and hinders 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 the phenomenons such as consolidation effect is inhomogeneous, later stage drainage effect is poor, " 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 vacuum preloading process, can realize from the control of the improvement of drainage channel and vacuum.For the improvement of drainage channel, major measure concentrates on to be improved plate core, filter membrane and the bonding mode thereof of plastic draining board, to postponing and alleviate time and the degree of silting generation.But under plastic draining board tensile strength requires, the improvement of its plate core and filter membrane is also subject to certain limitation, fail the silting problem of fine solution punishment band drain; For the moulding of plastic strip plate and the improvement of bonding mode, solved to a certain extent the plate in-core silting causing because of factors such as itself moulding gaps, but with regard to the more ultra-soft of viscous fine particle content is native, this kind of improvement is less on the impact of filter membrane silting.For the control of vacuum in vacuum preloading process, existing ventilating vacuum silt prevention method, the anti-blocking vacuum method of superpressure etc. of being mainly.The former handling object is mainly mud, and need set up in advance drainage pipeline networks and carry out the quick water and soil separation of mud, is unsuitable for the ground processing of barged-in fill; The latter realizes the increase of negative pressure by direct-discharging drainage channel structure and pressure inlet, but the stickiness particle in ultra-soft soil still can move to band drain direction under high negative pressure effect, does not have corresponding silting blocking measure.
In sum, according to current 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 vacuum preloading treatment effect, realize the silting blocking punishment effect under ultra-soft soil " asynchronous vacuum conditions draining " new approaches.
Three, summary of the invention
There is the control that differs from existing vacuum method vacuum, the purpose of the method for the present invention is that is by apply different negative pressure of vacuum to water discharging body simultaneously, soil particle is moved left and right in drainage procedure, instead of in the past towards fixing water discharging body direction one-way movement, alleviate or eliminate the silting that causes water discharging body because apply the directed uniform migration of soil particle under identical vacuum degree condition simultaneously, thereby postpone the silting time of drainage pipe and near the soil body, solve the problem of moving the too early silting of drainage channel causing in existing vacuum preloading process because of earth material, connect by the difference selection to water discharging body vacuum and the interval of water discharging body, while realizing vertical drainage body vacuum in vacuum preloading process etc., difference regulates.
In order to realize above-mentioned object, 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 making at the horizontal drain pipe that descends in the same time mutually 2 kinds of employings or two or more different vacuum the negative pressure of vacuum that in adjacent vertical drainage body, formation varies in size, wherein the interior vacuum degree control of the horizontal drain pipe of condition of high vacuum degree is at 70～80kPa, in the horizontal drain pipe of rough vacuum, vacuum degree control is at 20～30kPa, and in the gutter of different vacuums, vacuum difference value remains between 40～60kPa; 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, according to the variation of horizontal drain pipe water yield, by vacuum in the horizontal drain pipe of vacuum in the horizontal drain pipe of increase rough vacuum and minimizing condition of high vacuum degree, realize the height circulation of vacuum in horizontal drain pipe is regulated, until the drainage rates of each horizontal drain pipe is close, then horizontal drain pipe is applied to identical vacuum carries out vacuum preloading.
The asynchronous vacuum dehydration preloading of a kind of ultra-soft soil, is characterized in that mentioned horizontal drain pipe adopts plastic pipe or steel pipe; Vertical drainage body is selected plastic draining board or drainage pipe.
The asynchronous vacuum dehydration preloading of a kind of ultra-soft soil, the height circulation that it is characterized in that vacuum in described horizontal drain pipe regulates, refer under the different prerequisite of the vacuum that ensures the adjacent vertical drainage body of synchronization, being adjusted to of vacuum in horizontal drain pipe looped, in the horizontal drain pipe pipe of condition of high vacuum degree, vacuum is high value-low value-high value-low value, and in the horizontal drain pipe pipe of rough vacuum, vacuum is low value-high value-low value-high value; ; When height circulation regulates, its single amplitude of accommodation is 20～30kPa.
The asynchronous vacuum dehydration preloading of ultra-soft of the present invention soil is different from traditional vacuum precompressed water discharging body is applied the method for same vacuum, and the advantage in the super soft grounds such as barged-in fill are processed is:
1. significantly alleviate the silting phenomenon in the empty precompressed process of ultra-soft soil, improve the soil solidifying degree after vacuum preloading.Due to the self-characteristic (the especially more soil body of stickiness content) of ultra-soft soil, after employing traditional vacuum precompressed processing a period of time, can there is the gathering of drainage channel and near stickiness grogs thereof, cause the silting of drainage system, the process that hinders soil solidifying draining, affects duration of a project and treatment effect.Adopt after asynchronous vacuum dehydration preloading, by the asynchronous vacuum control to water discharging body, realize adjacent vertical drainage body and apply different negative pressure simultaneously, can make soil particle move back and forth in drainage procedure instead of towards fixing water discharging body direction one-way movement, avoid the uniform gathering of orientation because of water discharging body periphery soil particle under identical condition of negative pressure effect in traditional vacuum preloading method, and then alleviate the silting phenomenon of ultra-soft soil in 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 the ultra-soft soil such as barged-in fill; Because avoiding the uniform gathering of orientation of the glutinous grain of water discharging body periphery, can realize the soil body and process the uniformity that rear soil strength strengthens simultaneously.
3. improve implementation cost low.Only need on the basis of existing directly discharging type vacuum prepressing method, carry out the interval connection of drainage pipe and the asynchronous vacuum control of drainage pipe, corrective measure is simple and expense is low.
Four, brief description of the drawings
Fig. 1 is that the two vacuum of the asynchronous vacuum dehydration preloading of ultra-soft soil is arranged schematic diagram;
Fig. 2 is that the many vacuum of the asynchronous vacuum dehydration preloading of ultra-soft soil is arranged schematic diagram;
Fig. 3 is that the many vacuum of the asynchronous vacuum dehydration preloading of ultra-soft soil regulates schematic diagram;
Wherein, 1-vertical drainage body; 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; 7-flow meter; 8-regulates vacuum equipment and vacuum pump; The horizontal drain pipe of vacuum in 9-; The drain header of vacuum in 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 (mostly being plastic draining board), shown in Fig. 1, adopt PVC tube connector 2 that vertical drainage body 1 is connected with the horizontal drain pipe 3 of rough vacuum, horizontal drain pipe 5 intervals of condition of high vacuum degree.The horizontal drain pipe 3 of rough vacuum, the horizontal drain 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 in the drain header 4 of rough vacuum, drain header 6 water sides of condition of high vacuum degree, fluid flowmeter 7 is installed, then be connected with regulating vacuum equipment and vacuum pump 8, the horizontal pipe that forms the asynchronous vacuum dehydration preloading of ultra-soft soil connects.
(2) vacuum preloading sealing is disposed.On horizontal pipe, lay geotextiles and diaphragm seal 11, and be pressed into and close on sealing ditch, the regional seal that completes vacuum pre-pressed soft soil foundation is disposed.
(3) turn on pump vacuumizes precompressed.Open vacuum pump, by regulating vacuum equipment to regulate the vacuum of different pipelines.Starting stage, the vacuum degree control in the drain header 6 of condition of high vacuum degree, at 70～80kPa, was carried out draining precompressed by the vacuum degree control in the drain header of rough vacuum 4 at 20～30kPa.
(4) carry out vacuum adjustment according to water yield.By the observational record to water yield in drain header, in the time that drain discharge occurs obviously to decline, vacuum in each vacuum tube is regulated.Increase the vacuum in the drain header 4 of rough vacuum simultaneously and reduce the vacuum in the drain header 6 of condition of high vacuum degree, wherein the vacuum single amplitude of accommodation is 20～30kPa, until the vacuum in the drain header 4 of original rough vacuum is adjusted to 70～80kPa; Vacuum in the drain header 6 of original condition of high vacuum degree is adjusted to 20～30kPa.
(5) implementation step of repeating step (4), the circulation of carrying out vacuum in horizontal drain pipe regulates, making the interior vacuum of drain header 6 pipe of condition of high vacuum degree is high value-low value-high value-low value, and in drain header 4 pipes of rough vacuum, vacuum is low value-high value-low value-high value; (6) until the drain header 4 of rough vacuum is close with the drainage rates of the drain header 6 of condition of high vacuum degree, the ultra-soft soil such as barged-in fill are carried out to the condition of high vacuum degree precompressed under identical vacuum, make draining pre-compressed effect more even, soil strength promotes higher.
Adopt the concrete layout enforcement figure of the asynchronous vacuum dehydration preloading of many vacuum 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 by the vacuum degree control in the horizontal drain pipe of rough vacuum 4 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 under 20～30kPa, to carry out draining precompressed.
While carrying out vacuum adjusting while adopting the asynchronous vacuum dehydration preloading of many vacuum, the single amplitude of accommodation is 20～30kPa, when conciliation, reduce the vacuum of the drain header 6 of original condition of high vacuum degree, make it to become the drain header 10 of middle vacuum, 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 horizontal drain pipe regulates, until the drainage rates of each drain header is close, then the ultra-soft soil such as barged-in fill are carried out to the condition of high vacuum degree precompressed under identical vacuum.The vacuum of the asynchronous vacuum dehydration preloading of many vacuum regulates and changes 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 making at the horizontal drain pipe that adopts down in the same time mutually two or more different vacuum the negative pressure of vacuum that in adjacent vertical drainage body, formation varies in size, wherein the interior vacuum degree control of the horizontal drain pipe of condition of high vacuum degree is at 70～80kPa, in the horizontal drain pipe of rough vacuum, vacuum degree control is at 20～30kPa, and in the gutter of different vacuums, vacuum difference value remains between 40～60kPa; 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, according to the variation of horizontal drain pipe water yield, by vacuum in the horizontal drain pipe of vacuum in the horizontal drain pipe of increase rough vacuum and minimizing condition of high vacuum degree, realize the height circulation of vacuum in horizontal drain pipe is regulated, until the drainage rates of each horizontal drain pipe is close, then horizontal drain pipe is applied to identical vacuum 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 drainage pipe.
3. the asynchronous vacuum dehydration preloading of ultra-soft soil according to claim 1, the height circulation that it is characterized in that vacuum in described horizontal drain pipe regulates, refer under the different prerequisite of the vacuum that ensures the adjacent vertical drainage body of synchronization, being adjusted to of vacuum in horizontal drain pipe looped, in the horizontal drain pipe pipe of condition of high vacuum degree, vacuum is high value-low value-high value-low value, and in the horizontal drain pipe pipe of rough vacuum, vacuum is low value-high value-low value-high value; When height circulation regulates, its single amplitude of accommodation is 20～30kPa.
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| CN104452736B (en) * | 2014-12-05 | 2016-09-14 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of intermittent vacuum prepressing device and the method carrying out treatment of soft foundation thereof |
| CN105019426B (en) * | 2015-06-19 | 2016-08-17 | 盐城工学院 | Fluidised form mud silting blocking fast vacuum prepressing consolidation method with straw as displacement hull |
| CN105178284B (en) * | 2015-08-31 | 2017-07-11 | 上海交通大学 | A kind of pulse vacuum prepressing water discharge device and method of the soft base of muck soil |
| CN106759237A (en) * | 2016-11-25 | 2017-05-31 | 天津大学 | A kind of vacuum preloading method of alternative expression pumping |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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