CN101021069A - Stereo-low-level vacuum prepressing soft foundation processing method - Google Patents
Stereo-low-level vacuum prepressing soft foundation processing method Download PDFInfo
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- CN101021069A CN101021069A CN 200710020238 CN200710020238A CN101021069A CN 101021069 A CN101021069 A CN 101021069A CN 200710020238 CN200710020238 CN 200710020238 CN 200710020238 A CN200710020238 A CN 200710020238A CN 101021069 A CN101021069 A CN 101021069A
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Abstract
The present invention discloses a stereo-type low-place vacuum composite precompressed soft foundation treatment method. It is characterized by that said method includes the following steps: firstly, building a layer of horizontal drainage channel between original foundation and soil to be dredger filled; then creating vertical drainage channel in the original foundation; and building secondary layer of horizontal drainage channel on the surface of original foundation according to the height of soil to be dredger filled and making said secondary layer of horizontal drainage channel be communicated with the above-mentioned vertical drainage channel; then laying horizontal pipe in the horizontal drainage channel positioned on the surface of original foundation and making the horizontal pipe be extended to the exterior of cofferdam and performing an interface for connecting with vacuum pump so as to form a stereo-type vacuum drainage system; making dredger fill construction, after the dredger fill construction is completed, making vacuum drainage to simultaneously strengthen upper and lower soft soil foundations and making them be combined into one body.
Description
Technical field
The present invention relates to the soft soil foundation processing method in a kind of hydraulic reclamation epeirogenetic engineering, particularly multiple conventional method for processing foundation such as fixed, the piling prepressing of deadweight and artificial manufacture level and vertical drainage passage rationally and are organically combined, hydraulic reclamation one finishes can handle, need not wait for the soft soil foundation processing method of deadweight consolidation time, belongs to Soft Ground technical field in the geotechnical engineering.Specifically, be a kind of stereo-low-level vacuum prepressing soft foundation processing method.
Background technology
1, subgrade is handled and is had broad application prospects
Along with the minimizing that utilizes the soil and the enhancing of people's environmental protection consciousness can be supported in the city, in recent years people in coastal, river, hydraulic reclamation epeirogenetic engineering increasing (for example: Qingdao Hai Xiwan BEIHAI SHIPYARD, Shenzhen Airport enlarging, Nanhui District Harbor, Shanghai new city, Changxing Island shipbuilding base, Shanghai, prince wife Cao pasture Shoudu Iron and Steel Co human relocation project or the like all are to enclose extra large hydraulic reclamation to form land-based area) along the river.The common water content of most of barged-in fill, compressibilty is very high, permeability is very poor, belong to weak soil, must could satisfy instructions for use through handling after the hydraulic reclamation, just land resources is in short supply at present, this class engineering also can roll up in the future, thereby the subgrade processing has wide application prospect.
2, the deficiency of traditional method for processing foundation
Processing method for the saturated dredger soft soil routine mainly contains consolidation at present, replacement cushion method, roll and the compacting method, replace and admix method etc., these methods all have the scope of application separately, consolidation is applicable to the almost most of subgrade except the peat soil of permeance property extreme difference, mainly comprise preloading and vacuum method, preloading is meant the interim stone etc. that bankets of piling in the place, ground is handled the loading precompressed, settlement of foundation can be fulfiled ahead of schedule, and by the fixed raising bearing capacity of foundation soil of foundation soil, shed prefabricating load again after reaching requirement, this method has 3 deficiencies: a large amount of cubic metres of earth and stone are arranged near one needs, and cost is than higher; Its two preloading is highly crossed conference and is brought the slope stability problem; Its three duration is longer.Vacuum method is to intend laying sand cushion on the Ground Treatment, and vertical drainage passage (plastic draining board or sand drain) is set, and then use the diaphragm seal sand cushion, with vacuum pump sand cushion and vertical drainage passage are bled, vacuum is reduced, under the atmospheric pressure effect, quicken ground consolidation simultaneously, stop to bleed after reaching requirement, the weak point of this method is: one Ground Treatment bearing capacity is limited, about general 80kPa; Its two duration is longer.Replacement cushion method is that the weak soil in the ground is cut out, and is intensity height, sand, rubble or dirt etc. that density is big and change to fill out, and this method relatively is fit to local a spot of treatment of soft foundation, and large tracts of land, darker treatment of soft foundation economy are unreasonable, and the waste duration.Roll and the compacting method is to adopt certain plant equipment, with the foundation soil compacting, improve a kind of method of intensity simultaneously, the advantage of this method is that the construction period is short, intensity improves obviously, but generally only be applicable to cohesionless soil, miscellaneous fill, unsaturation cohesive soil etc., not too suitable for the barged-in fill that water content height, intensity are extremely low.For handling saturated dredger soft soil, conventional method must be finished and reaches certain intensity (this process 3～4 months at least through the fixed face of land of deadweight after a while at hydraulic reclamation, 1～2 year at most) after, man-machine material just can enter and carry out the subgrade processing, that is to say that present conventional method all exists wait barged-in fill deadweight consolidation strength to increase this long time course when handling saturated dredger soft soil, in the current time is exactly the epoch of benefit, if can effectively utilize this stand-by period to bring immeasurable economic benefit for engineering.In addition, barged-in fill is a ground in the future, and be imposed load for original ground, be that barged-in fill is being brought into play the effect of " piling prepressing " to following original ground, owing to there is not vertical drainage body (sand drain or plastic draining board), the effect of " piling prepressing " is had a greatly reduced quality, in order to utilize the preloading effect of barged-in fill deadweight consolidation time and barged-in fill itself, exploitation is a kind of not to need to wait for that deadweight is fixed with regard to needing, the new method for processing foundation that the hydraulic reclamation end can be handled at once, the present invention has proposed the stereo-low-level vacuum prepressing method for these considerations just.
Summary of the invention
It is lower to the purpose of this invention is to provide a kind of processing duration weak point, effect, cost, has the stereo-low-level vacuum prepressing soft foundation processing method of good economic benefit and wide application prospect.
Technical solution of the present invention is: a kind of stereo-low-level vacuum prepressing soft foundation processing method is characterized in that: at first, and at original ground and make in the future one deck horizontal drainage passage between the barged-in fill; Secondly, in original ground, set up the vertical drainage passage; On original foundation surface, desire the barged-in fill height again and establish one deck horizontal drainage passage at least again, and make it and aforementioned vertical drainage passage UNICOM; Then, in the horizontal drainage passage of original foundation surface, lay horizontal tube, and extend to the outside, cofferdam and reserve the interface that connects with vacuum pump; Below promptly form three-dimensional low-pressure drainage system, next carry out dredge fill again, wait hydraulic reclamation once finishing to enter the vacuum drainage stage, making up and down, soft soil foundation obtains reinforcing at short notice simultaneously at once.
The horizontal drainage passage of the original foundation surface described in the present invention is constructed by lay sand cushion before the hydraulic reclamation on original ground.When constructing the horizontal drainage passage of original foundation surface, if sand source deficiency is then excavated latticed french drain and back-up sand.The vertical drainage passage is to connect housing in row to insert vertical vacuum tube and expose the barged-in fill height and construct in original ground.Desiring the barged-in fill height and establish one deck horizontal drainage passage at least again on original foundation surface, is one or more layers plastic draining board is set at the original foundation surface certain altitude of distance place and constructs with vertical vacuum tube UNICOM.
Beneficial effect of the present invention is: it is lower to handle duration weak point, effect, cost, thereby has good economic benefit and wide application prospect.
The present invention is described in further detail below in conjunction with drawings and Examples:
Description of drawings
Be further described below in conjunction with the concrete enforcement of accompanying drawing this method.
Fig. 1 is the comparison diagram of a kind of stereo-low-level vacuum prepressing soft foundation processing method of the present invention and conventional method for processing foundation;
Fig. 2 is the prime stratum schematic diagram;
Fig. 3 is the build cofferdam of stereo-low-level vacuum prepressing soft foundation processing method of the present invention and lays the sand cushion schematic diagram;
Fig. 4 is the slotting vacuum tube and the preset level drainage channel schematic diagram of stereo-low-level vacuum prepressing soft foundation processing method of the present invention;
Fig. 5 buries horizontal tube underground and reserves vacuum pump interface schematic diagram for stereo-low-level vacuum prepressing soft foundation processing method of the present invention;
Fig. 6 finishes laggard capable hydraulic reclamation schematic diagram for the three-dimensional drainage system setting of stereo-low-level vacuum prepressing soft foundation processing method of the present invention;
Fig. 7 is that the hydraulic reclamation of stereo-low-level vacuum prepressing soft foundation processing method of the present invention finishes back stereo-low-level vacuum prepressing soft foundation processing schematic diagram.
The specific embodiment
Among Fig. 1,2,3,4,5,6,7: 1 is the top layer weak soil; 2 is substratum soil; 3 is the cofferdam; 4 is sand cushion; 5 is vacuum tube; 6 is the preset level drainage channel; 7 is the preset level house steward; 8 is spare interface; 9 is barged-in fill; 10 is vacuum pump.
Fig. 1 is that stereo-low-level vacuum prepressing method and conventional treatment method are in the difference of ground on the processing time, wherein abscissa is the time, and ordinate is a bearing capacity of foundation soil, and t1 is the used time of hydraulic reclamation, t2 is conventional deadweight consolidation time, and t3 handles required time for the conventional method ground; T3 ' handles required time for the stereo-low-level vacuum prepressing method.This broken line of L1+L2+L3+L4 is the conventional method processing procedure, and time corresponding is t1+t2+t3; This broken line of L1+L2+L3 ' is a stereo-low-level vacuum prepressing method processing procedure, and time corresponding is t1+t3 '.
Fig. 2,3,4,5,6,7 is a stereo-low-level vacuum prepressing method Foundation Treatment flow process, the following statement of the specific embodiment.
As can be seen from Figure 1, usually need deadweight consolidation time t2 and ground processing time t3 behind hydraulic reclamation time t1, the hydraulic reclamation for barged-in fill ground conventional method, but for the stereo-low-level vacuum prepressing method, hydraulic reclamation time t1 equates, but it has saved the deadweight consolidation time and has directly handled (seeing it is L3+L4 two step to be combined into a L3 ' step carry out from figure), ground processing time t3 ' is much smaller than the t2+t3 of conventional method, therefore on the whole time occupation ratio than remarkable advantages.
The stereo-low-level vacuum prepressing method is specifically implemented following six steps of branch and is carried out:
1) lays sand cushion: fill out the sand cushion that thickness is 40～50cm earlier at the plan blast-filled ground, at original ground and the artificial one deck horizontal drainage passage (if sand source deficiency also can be excavated latticed french drain and back-up sand, it is definite that the french drain array pitch press the gutter radius of influence) of making between the barged-in fill in the future;
2) insert vacuum tube: determine vacuum tube length and corresponding filter screen length according to handling the degree of depth, plan barged-in fill thickness and length in reserve (comprising prediction settling amount, gutter exposure part), then gutter is inserted the stratum by certain ranks arranged;
3) plastic draining board is set in the bottom horizontal channel: be layered on the original ground and link plastic draining board is several rows of with the vacuum tube on next door, and then plastic draining board is linked up (during no plastic draining board and sand cushion link) and pass the cofferdam and stretch out outside, place (reserving joint links with vacuum pump in the future) by horizontal tube, plastic draining board and horizontal tube respectively with the compound preloading of vacuum in chimney filter be responsible for similar, form a netted drainage channel at original ground after laying is finished, this measure is in order further to strengthen the drainage effect of sand cushion;
4) set in advance horizontal channel in the barged-in fill (aerial horizontal channel): the plastic draining board that is arranged on horizontal drainage passage in the barged-in fill and bottom is similar, be with plastic draining board several rows of vacuum tube to be linked up and form the latticed horizontal drainage passage of one deck leaving original foundation surface certain altitude (general about 1.5m), when barged-in fill is thicker, can multilayer up be set successively by the spacing about 1.5m, can form the three-dimensional drainage system that vertically combines in the barged-in fill in future after this work is finished with the horizontal channel;
5) carry out hydraulic reclamation to design elevation: after three-dimensional low-pressure drainage system is finished in advance and checked tightness comprehensively, can carry out hydraulic reclamation, must be noted that during dredge fill and can not damage three-dimensional low-pressure drainage system;
6) vacuum drainage pre-compression: in cofferdam outside vacuum pump linked with the horizontal tube of having reserved and to carry out vacuum drainage, water in the barged-in fill flows down in the sand cushion after the vacuum pump discharge, and the water in the original ground is upwards to flow in the sand cushion after vacuum pump is discharged, and two-layer weak soil has obtained reinforcing at short notice simultaneously thereby make up and down; For gas clean-up can be laid vacuum diaphragm on the barged-in fill surface.
Realized that by above-mentioned construction technology process a cover low-pressure drainage system carries out simultaneously treated function to two-layer soil up and down, each parameter in concrete enforcement, for example the arrangement form of vacuum tube spacing, length, default aerial horizontal channel, interlamellar spacing etc. all need to determine in conjunction with engineering experience simultaneously through calculating.
Because it is high that barged-in fill finishes the back water content at hydraulic reclamation, bearing capacity of foundation soil is extremely low, the ground processing machine can't enter, conventional method for processing foundation must be treated that hydraulic reclamation finishes and just can carry out after fixed through conducting oneself with dignity after a while, not only wasted the plenty of time, and to have ignored barged-in fill itself be foundation soil, be again the piling prepressing load this " dual identity " of original ground simultaneously, missed the perfect opportunity that ground is handled, at this present situation, the present invention adopts and buried drainage system underground before hydraulic reclamation, hydraulic reclamation one finishes and can handle, thereby the deficiency that man-machine material can't be marched into the arena when having avoided firm hydraulic reclamation and finishing has maximally utilised the preloading effect of barged-in fill simultaneously again.
This summary of the invention mainly comprises four parts: 1. horizontal drainage passage between barged-in fill and the original ground, 2. the vertical drainage passage, 3. set in advance in the barged-in fill the horizontal drainage passage and 4. barged-in fill to the precompressed effect of primitive soil.
1.. dose sand cushion as the horizontal drainage passage between barged-in fill and original ground, sand cushion is similar in this place's vacuum preloading, if sand source deficiency also can adopt excavation french drain and back-up sand; 2.. the vertical drainage passage adopts vacuum tube (can adopt plastic draining board simultaneously as required), before hydraulic reclamation work is carried out, earlier vacuum tube is arranged apart from housing in row by a fixed point and be inserted in the stratum, its length is handled the degree of depth and the decision of barged-in fill thickness by the requirement of original ground, and to guarantee that hydraulic reclamation exceeds (being lower than) barged-in fill end face 30～50cm later on, be layered on the original ground and link plastic draining board (existing sand cushion) is several rows of in order to add three-dimensional low-position vacuum effect with the vacuum tube on next door, and then plastic draining board is linked up and passes the cofferdam by horizontal tube and stretch out place outside, plastic draining board and horizontal tube respectively with the compound preloading of vacuum in chimney filter be responsible for similarly, lay and finish the back at netted drainage channel of original ground formation; 3.. it is similar to set in advance the horizontal channel that was layered on the original ground in horizontal drainage passage in barged-in fill (can save this procedure when intending barged-in fill thickness less than 2m) and last step, but absolute altitude will exceed about original ground 1.5m, saved horizontal tube simultaneously, if barged-in fill is thicker, can multiple tracks up be set successively by the spacing about 1.5m, promptly form one or more layers horizontal drainage passage after this work is finished aloft; 4.. hydraulic reclamation is to design elevation, extraterrestrial (outside the cofferdam) on the scene connects the three-dimensional vacuum system of composition with vacuum pump and carries out the three-dimensional low-position vacuum of vacuum with the person in charge, this vacuum system forces the level of water by wherein in the barged-in fill to passage (setting 3. in), vertical passageway (being provided with 2.), level is discharged to passage (being provided with 1.) and through vacuum pump, three-dimensional drainage channel and negative pressure of vacuum have been accelerated the deadweight consolidation rate of barged-in fill greatly, and original ground the three-dimensional low-position vacuum of vacuum and above under the barged-in fill preloading effect, water in soil draining fast on the one hand, also densification in time of hole in the soil on the other hand, thus consolidation rate also improves greatly.
The stereo-low-level vacuum prepressing method is the ground processing to be combined with hydraulic reclamation utilize a cover vacuum system that top barged-in fill and following original ground are carried out simultaneously treated a kind of soft base processing method, it has the duration of saving, cost is low and high treating effect, say its save duration be meant with ground handle with hydraulic reclamation after deadweight is fixed carries out synchronously, saved wait consolidation strength rise time; Say that low being meant of its cost insert that vacuum tube can reclaim repeated use in the stratum, the duration go into operation early in advance also be accelerate recovery of the capital one greatly by way of; Say that its treatment effect is meant well because high vacuum negative pressure is in the barged-in fill bottom, water in the barged-in fill under dead weight and this differential pressure action of negative pressure of vacuum not only Free water can discharge, and water of hydration also can be forced to discharge a little less than the part, more helps the consolidation effect of barged-in fill.Therefore this method has remarkable economic efficiency.
Claims (5)
1, a kind of stereo-low-level vacuum prepressing soft foundation processing method is characterized in that: at first, and at original ground and make in the future one deck horizontal drainage passage between the barged-in fill; Secondly, in original ground, set up the vertical drainage passage; On original foundation surface, desire the barged-in fill height again and establish one deck horizontal drainage passage at least again, and make it and aforementioned vertical drainage passage UNICOM; Then, in the horizontal drainage passage of original foundation surface, lay horizontal tube, and extend to the outside, cofferdam and reserve the interface that connects with vacuum pump; Below promptly form three-dimensional low-pressure drainage system, next carry out dredge fill again, wait hydraulic reclamation once finishing to enter the vacuum drainage stage, making up and down, soft soil foundation obtains reinforcing at short notice simultaneously at once.
2, stereo-low-level vacuum prepressing soft foundation processing method according to claim 1 is characterized in that: the horizontal drainage passage of original foundation surface, construct by on original ground, laying sand cushion before the hydraulic reclamation.
3, stereo-low-level vacuum prepressing soft foundation processing method according to claim 2 is characterized in that: when constructing the horizontal drainage passage of original foundation surface, if sand source deficiency is then excavated latticed french drain and back-up sand.
4, stereo-low-level vacuum prepressing soft foundation processing method according to claim 1 and 2 is characterized in that: the vertical drainage passage is to connect housing in row to insert vertical vacuum tube and expose the barged-in fill height and construct in original ground.
5, stereo-low-level vacuum prepressing soft foundation processing method according to claim 1 and 2, it is characterized in that: desiring the barged-in fill height and establish one deck horizontal drainage passage at least again on original foundation surface, is one or more layers plastic draining board is set at the original foundation surface certain altitude of distance place and constructs with vertical vacuum tube UNICOM.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010081375A1 (en) * | 2009-01-16 | 2010-07-22 | 上海港湾软地基处理工程(集团)有限公司 | Presetting type high vacuum compact method for treating soft ground |
| CN101503875B (en) * | 2009-02-06 | 2010-08-25 | 孔清华 | Vacuum drainage sand wick soft ground processing method |
| CN101591904B (en) * | 2008-05-28 | 2012-04-25 | 徐立新 | Method for strengthening composite pile foundation by prepressing drainage and following grouting for drainage body |
| CN103031834A (en) * | 2011-10-09 | 2013-04-10 | 徐云童 | Low-position vacuum preloading rapid reinforcement method of soft foundation in hydraulic filling and reclamation |
| CN103215945A (en) * | 2013-04-09 | 2013-07-24 | 武汉二航路桥特种工程有限责任公司 | Stereo combined power drainage solidifying system and method for soft soil foundation of heterogeneous field |
| CN106638542A (en) * | 2016-11-09 | 2017-05-10 | 浙江水利水电学院 | Consolidation and drainage system for hydraulic fill soil and rapid reinforcement method for hydraulic fill soil |
| CN106869107A (en) * | 2017-02-28 | 2017-06-20 | 河北工业大学 | The novel solid drainage system and its dewatering construction method of a kind of reinforcing soft ground |
| 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 |
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- 2007-03-09 CN CNB2007100202380A patent/CN100513700C/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101591904B (en) * | 2008-05-28 | 2012-04-25 | 徐立新 | Method for strengthening composite pile foundation by prepressing drainage and following grouting for drainage body |
| WO2010081375A1 (en) * | 2009-01-16 | 2010-07-22 | 上海港湾软地基处理工程(集团)有限公司 | Presetting type high vacuum compact method for treating soft ground |
| CN101463601B (en) * | 2009-01-16 | 2011-08-03 | 上海港湾软地基处理工程(集团)有限公司 | Preset high vacuum soft foundation processing method by high vacuum compaction |
| CN101503875B (en) * | 2009-02-06 | 2010-08-25 | 孔清华 | Vacuum drainage sand wick soft ground processing method |
| CN103031834A (en) * | 2011-10-09 | 2013-04-10 | 徐云童 | Low-position vacuum preloading rapid reinforcement method of soft foundation in hydraulic filling and reclamation |
| CN103215945A (en) * | 2013-04-09 | 2013-07-24 | 武汉二航路桥特种工程有限责任公司 | Stereo combined power drainage solidifying system and method for soft soil foundation of heterogeneous field |
| CN103215945B (en) * | 2013-04-09 | 2016-06-08 | 武汉二航路桥特种工程有限责任公司 | The three-dimensional assembly power drain consolidation system of heterogeneous body place soft soil foundation and method |
| CN106638542A (en) * | 2016-11-09 | 2017-05-10 | 浙江水利水电学院 | Consolidation and drainage system for hydraulic fill soil and rapid reinforcement method for hydraulic fill soil |
| CN106638542B (en) * | 2016-11-09 | 2019-08-06 | 浙江水利水电学院 | Barged-in fill consolidation draining system and barged-in fill method for rapidly reinforcing |
| CN106869107A (en) * | 2017-02-28 | 2017-06-20 | 河北工业大学 | The novel solid drainage system and its dewatering construction method of a kind of reinforcing soft ground |
| 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 |
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