CN100516373C - Double-vacuum self-loading preloading and geotechnical composite filler low-energy dynamic compaction method for strengthening soft soil - Google Patents
Double-vacuum self-loading preloading and geotechnical composite filler low-energy dynamic compaction method for strengthening soft soil Download PDFInfo
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- CN100516373C CN100516373C CNB200710025566XA CN200710025566A CN100516373C CN 100516373 C CN100516373 C CN 100516373C CN B200710025566X A CNB200710025566X A CN B200710025566XA CN 200710025566 A CN200710025566 A CN 200710025566A CN 100516373 C CN100516373 C CN 100516373C
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Abstract
A ground reinforce procedure includes the steps of: A. low position vacuum self-loading pre-press; B. vacuum well point precipitation; C. vacuum electroosmosis precipitation and complex stuffing paving simultaneously; D. low power strong tamp; E. vibrate rolling; F. smoothing.
Description
Technical field
The present invention relates to a kind of being applicable to, the stream mud that transmission coefficient is little, the comprehensive strengthening method of the efficient large-area soft ground of mud and mucky soil ground based on fine grained.Especially a kind of be applicable to the place to intensity and deformation requirements the high and local material such as sandstone that lacks as the large tracts of land reinforcing soft foundation of the required filler of low-energy strong-ramming and utilize desilting mud to raise the reclaiming land around sea of its elevation or the method for low-lying land raising engineering, the method for specifically a kind of double-vacuum self-loading prepressing and earthwork composite filling low-energy strong-ramming reinforcing soft soil.
Background technology
At present, reinforcing soft ground and the process of raising its elevation have preloading, vacuum preloading joint preloading method, low position vacuum preloading method etc.Particularly Chinese invention patent application CN1884708A discloses a kind of " double vacuum self-load combined precompressed and power compacting method integrative consolidation weak soil technology ", this technology has not only overcome the deficiency of above-mentioned Zhu worker's method, and provide a kind of place weak soil and hydraulic reclamation have been raised the simultaneously treated method of mud layer, and the place intensity after handling is higher, the fixed cycle is short, finish " cutting out a piece of cloth in a way with the minimum material to make two or more articles of clothing " effect that desilting and epeirogenetic get both, had tangible economic and social benefit.Yet this technology also has some shortcoming and defect, so that has restricted its promotion and application to a certain extent, and its major defect is as follows:
1, in worker's method to the fixed main dependence vacuum electroosmosis precipitation of super thick mudding layer and the second consolidation of low-energy strong-ramming, and soft foundation still is in very weak state behind vacuum electroosmosis precipitation, strong construction machinery such as rammers grade can't enter the place operation at all.For this reason, must before strong the rammer, lay the filler of one deck adequate thickness such as sand, stone earlier.This must transport sand, stone at a distance for the area that lacks sand, stone resource, and construction costs is increased suddenly, even also can worker's method be found oneself in the mire because of these fillers can't be provided at all.
2, in worker's method by vacuum electroosmosis precipitation to low-energy strong-ramming, middle must and the laying the long engineering time of filler through tube drawing.This moment, hydrostatic pressure was big if run into following situation: a, be in the place of peripheral high water level; A little less than the peripheral tube effect of b, design; C, long-term raining, surface flow are abundant etc. to the shallow-layer make up water.At this moment water " recharged " phenomenon outside the place behind precipitation will take place, and the water level pipe water level is risen, and it is unfavorable greatly to bring for following one low-energy strong-ramming construction.
3, in worker's method if it be strong when ramming filler adopting the piece masonry, the place after strong the rammer because the obstruction of piece stone, very difficult insertion vacuum electroosmosis pipe during second time vacuum electroosmosis precipitation, thus make this technology because of failing by pore-forming.
Above-mentioned shortcoming has restricted the promotion and application of this worker's method to a great extent.
Summary of the invention
The purpose of this invention is to provide a kind of vacuum well point pipe with novelty of anti-filter gradient, finish vacuum well-point dewatering, and directly utilize place undisturbed soil as the strong double-vacuum self-loading prepressing of filler and the method for earthwork composite filling low-energy strong-ramming reinforcing soft soil of ramming, to overcome the deficiencies in the prior art.
Technical scheme of the present invention is:
The method of a kind of double-vacuum self-loading prepressing and earthwork composite filling low-energy strong-ramming reinforcing soft soil is characterized in that:
At first carry out the self-load combined precompressed of low-position vacuum, promptly build cofferdam 2 earlier, serous fluid of dredger fill 3 is gone into the cofferdam to setting elevation, on the mud face, insert plastic draining board 13, shop vacuum level webmaster 4 is installed vacuum system 5, blows super thick mudding layer 6, the vacuum preloading system vacuumizes, and the self-load combined precompressed of low-position vacuum begins; When the weak soil below the mudding layer is issued to the design degree of consolidation in the acting in conjunction of the self-loading prepressing load of vacuum preloading and mudding layer, the self-load combined precompressed of low-position vacuum finished when the mudding layer also had certain intensity;
In second step, carry out the vacuum well-point dewatering first time;
In the 3rd step, carry out first time vacuum electroosmosis precipitation and also lay earthwork composite filling simultaneously;
The 4th step, pull out that the compound well point of installing in second step and the 3rd step construction is managed and carry out the first pass low-energy strong-ramming electric osmose pipe time, hit the injection amount less than 20cm until two;
The 5th step, after the first pass low-energy strong-ramming finishes, carry out respectively second time vacuum well-point dewatering and the second time vacuum electroosmosis precipitation, after the water level behind the vacuum electroosmosis dewatering is reduced to below 4 meters, still continue electroosmosis dewatering end after 2-3 days, only keep vacuum well-point dewatering till not water outlet is managed in compound well point;
The 6th step, the second time vacuum well-point dewatering and for the second time vacuum electroosmosis precipitation finish to lay simultaneously earthwork composite filling, when pore water pressure dissipation 80% is above, pull out that manage compound well point and the electric osmose pipe carries out low-energy strong-ramming second time;
The 7th step, after second time low-energy strong-ramming finishes, on mudding layer 6, erect slotting compound well point pipe again and carry out vacuum well-point dewatering with the dissipation excess pore water pressure, on mudding layer 6, completely spread simultaneously earthwork composite filling, the excess pore water pressure that causes when second time low-energy strong-ramming dissipates 80% when above, pull out compound well point pipe, carry out low-yield full the rammer the 3rd time.Operation through 2～3 times " the shop earthwork composite filling carries out low-energy strong-ramming more earlier " reaches the overconsolidation requirement up to super thick mudding layer;
Carry out vibroroller cmpacting and smooth place at last.
Described vacuum preloading system is made up of horizontal main, arm, plastic draining board, collecting well and vacuum pump, horizontal main and arm are laid on and blow on the mud face, and plastic draining board links to each other with arm, and arm connects main, main links to each other with collecting well, and collecting well links to each other with vacuum pump.
The thickness of described super thick mudding layer is 2～6 meters, it be the system of holding one's breath be again the self-loading prepressing system.
Described composite evacuated well point pipe is for having the compound well point pipe of anti-filter gradient system, it is made up of filter 15, anti-filter cloth 16, anti-filter cloth cover 17, medium coarse sand 19, last backfill 20 and body 14, filter 15 is positioned on the lower end of body 14, anti-filter cloth 16 is wrapped on body 14 and the filter 15, medium coarse sand 19 is wrapped in the space between anti-filter cloth 16 and the anti-filter cloth cover 17, and last backfill 20 is positioned on the upper surface of medium coarse sand 19.
Every ending standard all over vacuum well-point dewatering is that not water outlet, coefficient of balance are managed greater than 0.75 in compound well point.
The tamping energy of first pass low-energy strong-ramming is 500～800kNm, rams a little to be square or quincuncial arrangement, and every clicks 1～2 is hit, and when last two injection amounts of hitting during less than 20cm, the first pass low-energy strong-ramming finishes; The tamping energy of second time low-energy strong-ramming is 800～1000kNm, rams a little to be square or quincuncial arrangement, and every 2～3 is hit; Tamping energy 1000～the 1200kNm of the 3rd time low-energy strong-ramming, the full rammer rammed seal overlap joint 1/4-1/3, and every clicks is 1～2 to hit.
Described earthwork composite filling is bag or the woven bag of being made of geotextiles by many, bag is of a size of 40cm * 40cm * 10cm～120cm * 120cm * 20cm, dress place original state weak soil in the bag, its laying method is as follows: first and second earthwork composite filling all over required laying before the low-energy strong-ramming should be laid on the tamping point position of design, thick 20～the 30cm of earthwork composite filling, the seam of every layer of bag should upper and lower fault be opened, and formation is staggeredly stacked; Should on the mudding layer, completely spread earthwork composite filling before the 3rd time low-energy strong-ramming, thick 20～30cm, every layer of earthwork composite filling has tight arrangement of many connection bags to form, each group disjunctor bag is made up of two bags, its sack and sack are to being bundled into the disjunctor shape and forming hingedly, and the multilayer bag piles up laying at whole reinforcing area cross stratification.
In rich groundwater, the peripheral water level height in place, the abundant area of surface flow make up water, the peripheral tube sealing of length pipe jointing should be set, promptly between long tube, insert short tube, in order to solve the precipitation of shallow seated groundwater, thoroughly solve the generation that outer water recharges phenomenon.
When first pass vacuum well-point dewatering and first pass vacuum electroosmosis precipitation, all adopt long tube, about the about 6m of wherein compound well point pipe range, about the about 7m of electric osmose pipe range, second, third all adopts short tube all over vacuum well-point dewatering and vacuum electroosmosis precipitation, about the about 3m of wherein compound well point pipe range, about the about 4m of electric osmose pipe range, with eliminate shallow-layer precipitation not in place, prevent that shallow soil is softening.
Beneficial effect of the present invention:
A, the present invention utilize original state weak soil major part and even all replace fillers such as sand, stone, have reduced construction costs, and be especially particularly like this to lacking sandstone or not having the sandstone area.
B, the present invention are owing to introduced earthwork composite filling, make the two construction synchronously of vacuum electroosmosis precipitation and low-energy strong-ramming become possibility, this makes one end of vacuum electroosmosis precipitation, can carry out low-energy strong-ramming by tube drawing at once, thereby make the intermittent time of two procedures almost nil, this will stop the generation that outer water recharges phenomenon effectively, greatly reduce the probability that spongy soil appears in strong rammer.
C, earthwork composite filling structure are a kind of flexible structures, can import rammer energy in the ground into according to the soft or hard situation adjustment of place soil, make the ground after the reinforcing be tending towards even.
D, earthwork composite filling structure are a kind of powerful reinforcement systems, and after the staggered shop of multilayer filler was filled out, the pressure angle of flare on top layer, place reached more than 40 degree; The bearing capacity of handing on the face can reach more than the 150kPa, has improved bearing capacity of foundation soil greatly.
Introduced new compound well point pipe among E, the present invention with anti-filter gradient system, make and in the vacuum-dewatering process, significantly reduce outside the plugging probability, the dissipation system that compound well point pipe again can the super quiet hole of double as be pressed and the composite reinforced system in place have improved the consolidation effect of worker's method.
But F, earthwork composite filling batch production production, it is fast that speed is filled out in the shop, improved efficiency of construction greatly.
Description of drawings
Fig. 1 is double-vacuum self-loading prepressing of the present invention and earthwork composite filling low-energy strong-ramming reinforcing soft soil method schematic diagram.
Fig. 2 is the structural representation that has the compound well point pipe of anti-filter gradient system of the present invention.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, 2.
1, the self-load combined precompressed of low-position vacuum
Referring to Fig. 1.Build cofferdam 2 earlier, serous fluid of dredger fill 3 is gone into the cofferdam to certain elevation, inserts plastic draining board 13 on the mud face, and shop vacuum level webmaster 4 is installed vacuum system 5, blows super thick mudding layer 6, and the vacuum preloading system vacuumizes, and the self-load combined precompressed of low-position vacuum begins.Horizontal main of laying and arm on the mud face are promptly blowing in the vacuum preloading system, and plastic draining board links to each other with arm, and arm connects main.Main links to each other with collecting well, and collecting well links to each other with vacuum pump.Weak soil below the mudding layer is issued to the design degree of consolidation in the acting in conjunction of the self-loading prepressing load of vacuum preloading and mudding layer, and when the mudding layer also had certain intensity, the self-load combined precompressed knot of low-position vacuum came.
2, vacuum well-point dewatering
Arrange the vacuum well-point dewatering system on the mudding layer, vacuum well-point dewatering begins, and (it is constructed as shown in Figure 2, and among the figure: 15 is filter, and 16 is the anti-filter cloth parcels of 120 orders, and 18 is the anti-filter cloth covers of 80 orders promptly to erect the parallel compound well point pipe 7 of slotting many rows on the mudding layer; 19 is medium coarse sand, mud content≤3%; 20 last backfills, medium coarse sand, mud content≤3%, pipe range about 6m in compound well point is (if the mudding bed thickness is less than 3m, the effective 3m short tube in compound well point), run through the mudding layer, the long 2m of filter, compound well point tube pitch 2m * 2m～4m * 4m, it links to each other with many horizontal tube connectors, tube connector includes transparent woollen goods pipe of spirality steel wire with 41mm * 51mm * 40mm, tube connector is connected with water header, and water header connects with supporting with it special joint with the pvc pipe of Φ 63mm, internode, and with threeway water header and house steward are joined, house steward is connected with vacuum system 10.For preventing that outer water from recharging the disposal field, should establish peripheral tube sealing in processed place, when the periphery was in high water level or peripheral shallow-layer make up water and enriches then and there, peripheral tube sealing should adopt the length pipe jointing, and was shallow to solve, the precipitation of deep water.General 7～9 days of vacuum well-point dewatering time, when coefficient of balance greater than 0.75 the time, vacuum well-point dewatering finishes.
3, vacuum electroosmosis precipitation is laid earthwork composite filling simultaneously
The pipe medial shaft is inserted many parallel electric osmose pipes 8 in compound well point, intelligent electroosmosis dewatering instrument 9 (can referring to the relevant patent of applicant in first to file) is installed, vacuum electroosmosis precipitation begins, promptly manage identical steel pipe (Φ 32mm steel pipe) as the electric osmose pipe in reinforcing bar or the compound well point of compound well point pipe disposed inboard Φ 25mm, the electric osmose pipe becomes isosceles triangle to arrange with compound well point pipe.Link to each other with the positive pole of intelligent electroosmosis dewatering instrument with aluminium bar and with the continuous back of special-purpose folder between the electric osmose pipe, link to each other with the negative pole of intelligent electroosmosis dewatering instrument with the continuous back of Φ 5mm reinforcing bar spot welding between the pipe of compound well point, article two, circuit formation direct current is gone the same way, and everything is ready, and vacuum electroosmosis precipitation begins.Meanwhile, on the tamping point of pressing the design of first pass low-energy strong-ramming between pipe, lay earthwork composite filling 11, about 20～the 30cm of earthwork composite filling bag bedding thickness, each bag is of a size of 40cm * 40cm * 10cm～120cm * 120cm * 20cm, the seam that bag is every layer should stagger between levels, and formation is staggeredly stacked.Ground surface whiting then and there, near the place cracking at electric osmose pipe place, first pass vacuum electroosmosis precipitation finishes.
4, first pass low-energy strong-ramming (point rams)
Pull out electric osmose pipe and compound well point pipe, and then the first pass low-energy strong-ramming begins, and hits the injection amount less than 20cm when last two, and the first pass low-energy strong-ramming finishes.Exchange principle according to compound well point pipe and electric osmose pipe position, perpendicular compound well point pipe and the electric osmose pipe inserted on the mudding layer, carry out vacuum well-point dewatering earlier, manage not water outlet until compound well point, and then vacuum electroosmosis precipitation begins, when water level is reduced to below 3～4m, when obviously increasing, water yield carries out 2～3 days vacuum electroosmosis precipitation again, thereafter stop electroosmosis dewatering, only keep vacuum well-point dewatering, till not water outlet is managed in compound well point (two times about 15～20 days of required total times of vacuum electroosmosis precipitation).
5, second time low-energy strong-ramming (point rams)
Utilize the time that excess pore water pressure dissipates behind the first pass low-energy strong-ramming, place mat earthwork composite filling on the tamping point of pressing second time low-energy strong-ramming design on the mudding layer, be the thick about 20～30cm of earthwork composite filling bag, each bag is of a size of 40 * 40 * 10cm～120 * 120 * 20cm, and the seam of every layer of bag staggers between levels.When pore water pressure dissipation 80% is above, pull out electric osmose pipe and compound well point pipe, second time low-energy strong-ramming begins.
6, the 3rd time low-energy strong-ramming (the full rammer)
After second time low-energy strong-ramming finished, the perpendicular compound well point pipe of inserting carried out the dissipation that vacuum well-point dewatering is beneficial to excess pore water pressure on the mudding layer.Simultaneously, on the mudding layer, completely spread earthwork composite filling, be the about 20～30cm of thickness of earthwork composite filling, about 40 * 40 * 10cm of each filler bag size～120 * 120 * 20cm, every layer of earthwork composite filling closely arranged by many disjunctor bags and formed, each disjunctor bag is formed its sack and sack by two bags to bundle, the multilayer bag piles up laying at whole reinforcing area cross stratification, the excess pore water pressure that causes when second time low-energy strong-ramming dissipates 80% when above, pull out compound well point pipe, the 3rd time low-energy strong-ramming begins.After 2～3 times " shop earthwork composite filling～low-energy strong-ramming earlier " constructions, super thick mudding layer reaches overconsolidation.More than the strong parameter of ramming be summarized in the table 1.7, vibroroller cmpacting, smooth place.
Table 1 low-energy strong-ramming parameter
| Pass | Tamping energy kNm | Arrangement form | Spacing (m) | Every clicks | The strong rammer time | Filling property before ramming |
| 1 | 500～800 | Square or quincunx | 4～6.5 | 1～2 | Electric osmose pipe and compound well point pipe are pulled out the promptly strong rammer in back | Pocket or woven bag with geotechnological cloth bag is made are of a size of 40 * 40 * 10cm～120 * 120 * 20cm, interior dress place undisturbed soil, and the seam of every layer of bag is opened in upper and lower fault, filler total thickness 20～30cm |
| 2 | 800～1000 | The same | 4～6.5 | 2～3 | The same | The same |
| 3 | 1000～1200 | The full rammer | Ram |
1～2 | Pulling out compound well point pipe rams by force at once | Pocket or woven bag with the geotextiles making, be of a size of 40 * 40 * 10cm～120 * 120 * 20cm, interior dress place undisturbed soil, every layer of earthwork composite filling closely arranged by many connection bags and formed, each connection bag is formed its sack and sack by two bags to bundle, the multilayer bag piles up full hall at whole reinforcing area cross stratification and lays. |
During concrete enforcement: blow super thick mudding layer and should reach 2～6m.Weak soil under super thick mudding layer reach the design consolidation strength, when the mudding layer also has certain intensity, the self-load combined precompressed of low-position vacuum can finish.Every ending standard all over vacuum well-point dewatering is that not water outlet is managed in compound well point, coefficient of balance is total to about 7～9 days greater than the time of 0.75, three time vacuum well-point dewatering.After first pass vacuum electroosmosis precipitation began, soil body cracking, the water content that is reinforced soil descended significantly near place whiting, electric osmose pipe, and first pass vacuum electroosmosis precipitation finishes; After second time vacuum electroosmosis precipitation a period of time, if the drawdown to 3 in water level hole～below the 4m and water yield obviously increase, continue 2～3 days this moment again can declare that second time vacuum electroosmosis precipitation finishes.Total about 15～20 days consuming time of vacuum electroosmosis precipitation.The first pass tamping energy is 500～800kNm, square or quincuncial arrangement, and every clicks 1～2 is hit, and when last two injection amounts of hitting during less than 20cm, the first pass low-energy strong-ramming finishes; Second time tamping energy is 800～1000kNm, and every 2～3 of square or quincuncial arrangement are hit; The 3rd time tamping energy 1000～1200kNm, the full rammer rammed seal overlap joint 1/4-1/3, and every clicks is 1～2 to hit.The vacuum-dewatering system i.e. the perpendicular compound well point pipe of inserting on super thick mudding layer, and compound well point pipe links to each other with horizontal tube connector, and tube connector is connected with water header, water header links to each other with house steward, house steward is connected with vacuum system.With the vacuum well-point dewatering while, ooze pipe and intelligent electroosmosis dewatering instrument is installed in the medial shaft plug-in of compound well point pipe, and the negative pole of compound well point pipe and intelligent electroosmosis dewatering instrument linked to each other, the positive pole of electric osmose pipe with intelligent electroosmosis dewatering instrument is connected, with the formation DC loop.In vacuum well-point dewatering, adopt the compound well point pipe that is provided with anti-filter gradient system as shown in Figure 2.Earthwork composite filling promptly is bag or the woven bag of being made of geotextiles by many, bag is of a size of 40cm * 40cm * 10cm～120cm * 120cm * 20cm, dress place original state weak soil in the bag, its laying method is as follows: first and second earthwork composite filling all over required laying before the low-energy strong-ramming should be laid on the tamping point position of design, about the thick 20～30cm of earthwork composite filling, the seam of every layer of bag should upper and lower fault be opened, and formation is staggeredly stacked; The 3rd time low-energy strong-ramming (the full rammer) is preceding should completely spread earthwork composite filling on the mudding layer, thick about 20～30cm, every layer of earthwork composite filling has tight arrangement of many connection bags to form, each group disjunctor bag is made up of two bags, its sack and sack are to being bundled into the disjunctor shape, and the multilayer bag piles up laying at whole reinforcing area cross stratification.When first pass vacuum electroosmosis precipitation begins, can on the tamping point position of ramming design between the tube and tube by first pass by force, lay earthwork composite filling, like this,, can ram by force on tube drawing limit, limit in case vacuum electroosmosis precipitation finishes, thoroughly stop the generation that outer water recharges accident.In rich groundwater, the peripheral water level height in place, the abundant area of surface flow make up water, the peripheral tube sealing of length pipe jointing should be set, promptly between long tube, insert short tube, in order to solve the precipitation of shallow seated groundwater, thoroughly solve the generation that outer water recharges phenomenon.
Reinforcing principle of the present invention:
A, following serous fluid of dredger fill and the place reinforcement of soft soil mechanism of mudding layer
The following ultra-soft soil of mudding layer is under the acting in conjunction of the self-loading prepressing load that the selfweight stress of 80kPa negative pressure of vacuum and super thick mudding layer changes into, and its fixed index improves greatly.
The reinforcement mechanism of B, super thick mudding layer
Super thick mudding layer under natural evaporation and pull of vacuum acting in conjunction, though obtain tentatively fixedly to a certain extent, still belongs to mud or mucky soil category generally in the low position vacuum preloading vacuum, still need and carry out second consolidation.
Its secondary consolidation mechanism is as follows:
(1) vacuum well-point dewatering
Super thick mudding layer makes most of Free water discharge via the vacuum well point pipe under the pull of vacuum effect, and the soil body obtains certain compression concretion, and this worker method adopts larger-diameter compound well point pipe simultaneously, and the reinforced action of sand pile composite foundation is also played in its existence.
(2) vacuum electroosmosis precipitation is also laid earthwork composite filling simultaneously
The mudding layer is in vacuum electroosmosis precipitation process, the place weak soil is in pull of vacuum, under the acting in conjunction of electric osmose power and baking effect, most of pore water in the weak soil is discharged via the vacuum well point pipe, make water content reduce to the required optimum moisture content of low-energy strong-ramming, for the next round low-energy strong-ramming creates conditions; Simultaneously, in vacuum electroosmosis precipitation process, progressively earthwork composite filling is laid and put in place, this makes vacuum electroosmosis precipitation in case finish and can carry out low-energy strong-ramming by tube drawing, thoroughly stop outer water and recharged place soil phenomenon generation, improve the compacted effect of low-energy strong-ramming greatly, and shortened the construction period.
(3) low-energy strong-ramming
On the soil body of effective precipitation, lay one deck earthwork composite filling, under the tamping energy effect, the girth of its earthwork composite filling bag can extend, in bag, produce sack tension force, the undisturbed soil that sack tension force retrains in the bag conversely causes the contact force between soil particle to increase, the soil body is in the three dimension stress state fully in the bag, finally makes the undisturbed soil in the bag form intensity and all very big integral body of rigidity under the constraint of sack tension force.The column tamping energy of low-energy strong-ramming then imports in its following soil layer by the very big earthwork composite filling of rigidity.The moment that hammer ram falls excites very big excess pore water pressure in soil layer, along with the dissipation that press in super quiet hole, weak soil is pressed in the process that is converted into effective stress in the hole and reached overconsolidation gradually under it, and soil strength also improves thereupon.
The all available prior art of part is not described in detail in detail in the present invention or the applicant is realized in the relevant patent of first to file.
Claims (9)
1, the method for a kind of double-vacuum self-loading prepressing and earthwork composite filling low-energy strong-ramming reinforcing soft soil is characterized in that:
At first carry out the self-load combined precompressed of low-position vacuum, promptly build cofferdam (2) earlier, serous fluid of dredger fill (3) is gone into the cofferdam to setting elevation, on the mud face, insert plastic draining board (13), shop vacuum level webmaster (4) is installed vacuum system (5), blows super thick mudding layer (6), the vacuum preloading system vacuumizes, and the self-load combined precompressed of low-position vacuum begins; When the weak soil below the mudding layer is issued to the design degree of consolidation in the acting in conjunction of the self-loading prepressing load of vacuum preloading and mudding layer, the self-load combined precompressed of low-position vacuum finished when the mudding layer also had certain intensity;
In second step, carry out the vacuum well-point dewatering first time;
In the 3rd step, carry out first time vacuum electroosmosis precipitation and also lay earthwork composite filling simultaneously;
The 4th step, pull out that the compound well point of installing in second step and the 3rd step construction is managed and carry out the first pass low-energy strong-ramming electric osmose pipe time, hit the injection amount less than 20cm until two;
The 5th step, after the first pass low-energy strong-ramming finishes, carry out respectively second time vacuum well-point dewatering and the second time vacuum electroosmosis precipitation, after the water level behind the vacuum electroosmosis dewatering is reduced to below 4 meters, still continue electroosmosis dewatering end after 2-3 days, only keep vacuum well-point dewatering till not water outlet is managed in compound well point;
The 6th step, the second time vacuum well-point dewatering and for the second time vacuum electroosmosis precipitation finish to lay simultaneously earthwork composite filling, when pore water pressure dissipation 80% is above, pull out that manage compound well point and the electric osmose pipe carries out low-energy strong-ramming second time;
The 7th step, after second time low-energy strong-ramming finishes, go up the perpendicular compound well point pipe of inserting at mudding layer (6) again and carry out vacuum well-point dewatering with the dissipation excess pore water pressure, simultaneously on mudding layer (6), completely spread earthwork composite filling, the excess pore water pressure that causes when second time low-energy strong-ramming dissipates 80% when above, pull out compound well point pipe, carry out low-yield full the rammer the 3rd time; Operation through 2～3 times " the shop earthwork composite filling carries out low-energy strong-ramming more earlier " reaches the overconsolidation requirement up to super thick mudding layer;
Carry out vibroroller cmpacting and smooth place at last.
2, the method for double-vacuum self-loading prepressing according to claim 1 and earthwork composite filling low-energy strong-ramming reinforcing soft soil, it is characterized in that described vacuum preloading system is made up of horizontal main, arm, plastic draining board, collecting well and vacuum pump, horizontal main and arm are laid on and blow on the mud face, plastic draining board links to each other with arm, arm connects main, main links to each other with collecting well, and collecting well links to each other with vacuum pump.
3, the method for double-vacuum self-loading prepressing according to claim 1 and earthwork composite filling low-energy strong-ramming reinforcing soft soil, the thickness that it is characterized in that described super thick mudding layer is 2～6 meters, it be the system of holding one's breath be again the self-loading prepressing system.
4, the method of double-vacuum self-loading prepressing according to claim 1 and earthwork composite filling low-energy strong-ramming reinforcing soft soil, it is characterized in that described composite evacuated well point pipe is for having the compound well point pipe of anti-filter gradient system, it is by filter (15), anti-filter cloth (16), anti-filter cloth cover (17), medium coarse sand (19), last backfill (20) and body (14) are formed, filter (15) is positioned on the lower end of body (14), anti-filter cloth (16) is wrapped on body (14) and the filter (15), medium coarse sand (19) is wrapped in the space between anti-filter cloth (16) and the anti-filter cloth cover (17), and last backfill (20) is positioned on the upper surface of medium coarse sand (19).
5, the method for double-vacuum self-loading prepressing according to claim 1 and earthwork composite filling low-energy strong-ramming reinforcing soft soil is characterized in that every ending standard all over vacuum well-point dewatering is that not water outlet, coefficient of balance are managed greater than 0.75 in compound well point.
6, the method for double-vacuum self-loading prepressing according to claim 1 and earthwork composite filling low-energy strong-ramming reinforcing soft soil, the tamping energy that it is characterized in that the first pass low-energy strong-ramming is 500～800kNm, ram and a little be square or quincuncial arrangement, every clicks 1～2 is hit, when last two injection amounts of hitting during less than 20cm, the first pass low-energy strong-ramming finishes; The tamping energy of second time low-energy strong-ramming is 800～1000kNm, rams a little to be square or quincuncial arrangement, and every 2～3 is hit; Tamping energy 1000～the 1200kNm of the 3rd time low-energy strong-ramming, the full rammer rammed seal overlap joint 1/4-1/3, and every clicks is 1～2 to hit.
7, the method of double-vacuum self-loading prepressing according to claim 1 and earthwork composite filling low-energy strong-ramming reinforcing soft soil, it is characterized in that described earthwork composite filling is bag or the woven bag of being made of geotextiles by many, bag is of a size of 40cm * 40cm * 10cm～120cm * 120cm * 20cm, dress place original state weak soil in the bag, its laying method is as follows: first, the earthwork composite filling of two times preceding required layings of low-energy strong-ramming should be laid on the tamping point position of design, thick 20～the 30cm of earthwork composite filling, the seam of every layer of bag should go up, lower floor staggers, and formation is staggeredly stacked; Should on the mudding layer, completely spread earthwork composite filling before the 3rd time low-energy strong-ramming, thick 20～30cm, every layer of earthwork composite filling has tight arrangement of many connection bags to form, each group disjunctor bag is made up of two bags, its sack and sack are to being bundled into the disjunctor shape and forming hingedly, and the multilayer bag piles up laying at whole reinforcing area cross stratification.
8, the method for double-vacuum self-loading prepressing according to claim 1 and earthwork composite filling low-energy strong-ramming reinforcing soft soil, it is characterized in that in rich groundwater, the peripheral water level height in place, the abundant area of surface flow make up water, the peripheral tube sealing of length pipe jointing should be set, promptly between long tube, insert short tube, in order to solve the precipitation of shallow seated groundwater, thoroughly solve the generation that outer water recharges phenomenon.
9, the method for double-vacuum self-loading prepressing according to claim 1 and earthwork composite filling low-energy strong-ramming reinforcing soft soil, it is characterized in that when first pass vacuum well-point dewatering and first pass vacuum electroosmosis precipitation, all adopt long tube, about the about 6m of wherein compound well point pipe range, about the about 7m of electric osmose pipe range, second, third all adopts short tube all over vacuum well-point dewatering and vacuum electroosmosis precipitation, about the about 3m of wherein compound well point pipe range, about the about 4m of electric osmose pipe range, with eliminate shallow-layer precipitation not in place, prevent that shallow soil is softening.
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| CN101225658B (en) * | 2008-02-18 | 2010-06-09 | 张志铁 | Soft soil foundation consolidation method |
| CN101302757B (en) * | 2008-03-07 | 2010-06-09 | 张伯谦 | Method for quickly processing heavy layer soft soil foundation |
| CN101660312B (en) * | 2009-09-11 | 2011-05-11 | 朱奎 | Reinforced cement mixing pile composite foundation treatment and construction method |
| CN102296590A (en) * | 2011-06-09 | 2011-12-28 | 宁波高新区围海工程技术开发有限公司 | High-strength reinforcing method of supersoft foundation |
| CN102330424B (en) * | 2011-07-05 | 2013-11-13 | 浙江广川工程咨询有限公司 | Vacuum preloading consolidation method for duplex vacuum tube well of blowing filling soft soil |
| CN102720174A (en) * | 2012-06-08 | 2012-10-10 | 中国十七冶集团有限公司 | Method for treating high-filled foundation in deep silt region |
| CN102817348B (en) * | 2012-08-31 | 2014-10-01 | 宝钢工程技术集团有限公司 | Treatment method of recent dredger-fill silt foundation |
| CN102979082B (en) * | 2012-12-27 | 2014-10-15 | 大连理工大学 | Method for consolidating soft soil foundation by using vacuum and magnetic field compound preloading |
| CN103321207A (en) * | 2013-06-05 | 2013-09-25 | 河海大学 | Solar drive electro-osmotic device and method for reinforcing soft soil foundations |
| CN105369797A (en) * | 2015-11-12 | 2016-03-02 | 江苏澄工科技有限公司 | Vacuum radiation solidification method for collapsible loess |
| CN107268567A (en) * | 2017-05-23 | 2017-10-20 | 天津大学 | The fluid injection of vacuum bellows is pressurized joint grouting and reinforcing super soft ground processing method |
| CN109252506A (en) * | 2018-08-17 | 2019-01-22 | 温州大学 | The system and technique of horizontal drainage vacuum preloading combined with electroosmosis reinforcing soft ground |
| CN111945702A (en) * | 2020-07-02 | 2020-11-17 | 福建鼎拓工程勘察设计有限公司 | A Rapid Displacement Method for Reinforcing Pile Body in Large-area Weak Foundation |
| CN113605359B (en) * | 2021-08-13 | 2022-06-21 | 中冶集团武汉勘察研究院有限公司 | Multilayer complex soft soil foundation rapid dewatering consolidation construction structure and construction method |
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