CN102926376A - Treatment method for soft soil foundation in coastal reclamation region - Google Patents
Treatment method for soft soil foundation in coastal reclamation region Download PDFInfo
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- CN102926376A CN102926376A CN2012104595695A CN201210459569A CN102926376A CN 102926376 A CN102926376 A CN 102926376A CN 2012104595695 A CN2012104595695 A CN 2012104595695A CN 201210459569 A CN201210459569 A CN 201210459569A CN 102926376 A CN102926376 A CN 102926376A
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Abstract
The invention belongs to the technical field of soft soil foundation treatment in geotechnical engineering, and particularly relates to a treatment method for a soft soil foundation in a coastal reclamation region. The soft soil foundation consists of a soft soil layer and a post-pumping filling soil layer covering on the soft soil layer, wherein the region comprises a deep layer treatment region and a non-deep layer treatment region. The treatment method comprise the following specific steps that long plastic drain boards are arranged in a beating manner before a pumping filling soil layer is formed in the deep layer treatment region; the heights of the long plastic drain boards are greater than the elevation of the pumping filling soil layer; then the pumping filling soil is formed; short plastic drain boards are arranged in a beating manner in the non-deep layer treatment region; and finally vacuum preloading is conducted in a large area in a partitioning manner. The treatment method has the advantages that treatment is finished by one step; pumping filling soil can be used as a load for accelerating consolidation settlement of the soft soil layer in the deep part during the pumping filling period; the construction period is saved; the manufacturing cost is lowered; and waste due to the conventional multistep and repeated treatment is reduced.
Description
Technical field
The invention belongs to Soft Soil Subgrade Treatment Techniques field in the geotechnical engineering, be specifically related to a kind of regional soft-soil foundation treatment method of reclaiming fields from the sea.
Background technology
At present, the mankind only have One Earth One Family, thereby land resources is extremely limited.Along with the urgency of world population increases, the expansion of activity space, the land resources in city are also more and more poorer, and the land resources in rural area must be considered to support the grain oil ﹠ vegetable arable land of numerous populations and requirement of forestry and must guarantee by emphasis, so urban construction can not account for the agriculture and forestry land used more.Country emphasizes: keep 18.8 hundred million mu of land farming resources, this is the police circles' line that can not break through when newly examining land resources.
For this reason, the developer can only transform the old urban area in cities and towns, and land resources is carried out secondary development, but because this is expensive land development, therefore also can runs into various technical barriers in land development and utilization and remain to be properly settled.Simultaneously, the exploitation amount of Support during Old City Reconstruction also is extremely limited.In coastal and river, river, lake, reclaiming fields from the sea in bank, creek waters, is another approach of urban construction Land Resources Exploitation.For example Holland implements one of country that reclaims fields from the sea in the world the earliest, and it all is to form like this that 2/3rds land resources are arranged, and Holland is world-famous windmill kingdom in addition, and the main Che Shuiyong when reclaiming fields from the sea of windmill; Japan just (is equivalent to 3,300 ten thousand m with annual 1000 ten thousand level grounds in phase early 1990s
2) extensive artificial land creating speed continue to push ahead.So large-scale artificial foundation is beyond example in the world, and this policy is still being carried out continuing.
China's shortage of land resource and rare be one of socio-economic development substantially reality.Such as 12 ends in 2004, Zhejiang Province government has issued " the coastal industrial zone of warm platform development plan ", the coastal construction of the industrial corridor of temperature platform formally raises the curtain, wherein land development stands in the breach, become the main path of land development and reclaim fields from the sea, according to the planning of Zhejiang Province government, the coastal industry of warm platform is with nearly thousand square kilometres enclosed and cultivated land used, and wherein only the Wenzhou City can enclose and cultivate land used and just reaches 448km
2After carrying out preliminary ground processing, will carry out municipal engineering construction.Large-scale municipal engineering construction is to the distortion of embankment and pipeline with stablely proposed higher requirement.
The affiliated landform unit in zone of reclaiming fields from the sea rushes marine plain for mostly being greatly littoral area's estuarine facies, and original weak soil is thick, and engineering geological condition is poor.Hydraulic reclamation carries out at original foundation, the underground Deep Thick Soft Ground that exists of roadway area, the above again preloading several meters thick barged-in fills.For stable all unfavorable with settlement Control.The barged-in fill soil property in hydraulic reclamation zone is poor, and water content is high; Bearing capacity of foundation soil behind the hydraulic reclamation is low; The modulus of resilience is all less; And sedimentation is complete stability not yet.Therefore, must carry out targetedly consolidation process to soft foundation in the regional Process of Engineering Construction of reclaiming fields from the sea, with stability and the minimizing settlement after construction that increases ground.The choice for use of soft base processing method all has important impact to workmanship, duration and economic benefit.
By extensive investigation and the comparative analysis to Base Consolidation Engineering such as domestic and international harbour, airport, roads, generally speaking, the scheme that the ground stabilization of the regional engineering of reclaiming fields from the sea is generally used at present, the most common with the scheme that puts in place in two steps: as to process to carry out first large tracts of land shallow-layer barged-in fill ground+carry out the deep layer soft soil foundation processing scheme as representative at road area afterwards, this type of scheme first step can reach the sedimentation of the elimination shallow-layer soil body, can satisfy the machinery construction requirement of marching into the arena; Second step reaches eliminates the sedimentation of the deep layer soil body to the impact of road, but long in time limit, and has carried out twice processing in the zone of need deep level of processing, has wasted the part manpower and materials.
In sum, how safe, quick, the economic Soft Ground of reclaiming fields from the sea is the Focal point and difficult point of engineering construction.Correlation experience and calculating empirical formula in view of this type of ground of present shortage is processed are difficult to Accurate Prediction solum settlement situation, so in conjunction with reclaiming fields from the sea area condition, it is necessary to propose not only reasonable but also economic suitable treatment of soft foundation scheme.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of regional soft-soil foundation treatment method of reclaiming fields from the sea is provided, this soft-soil foundation treatment method is by in the deep level of processing zone, before forming, the hydraulic reclamation soil layer sets long plastic draining board, can utilize barged-in fill to accelerate the consolidation settlement of deep Soft Soil Layer as load during the hydraulic reclamation, after hydraulic reclamation is finished, carry out again vacuum preloading, reach deep level of processing zone and one step of non-deep level of processing zone is processed the purpose that puts in place with this, customer service the tradition shortcoming that minute the multistep processing puts in place.
The object of the invention realizes being finished by following technical scheme:
A kind of regional soft-soil foundation treatment method of reclaiming fields from the sea, described soft foundation is made of Soft Soil Layer and the after-blow fill stratum that is covered on the described Soft Soil Layer, described zone comprises deep level of processing zone and non-deep level of processing zone, it is characterized in that described processing method comprises the steps: at least in described deep level of processing zone, before forming, the hydraulic reclamation soil layer sets long plastic draining board, and pre-if described long plastic draining plate height is higher than hydraulic reclamation soil layer absolute altitude; Finishing afterwards the hydraulic reclamation soil layer forms; Set short plastic draining board in non-deep level of processing zone afterwards; Last large tracts of land piecemeal carries out vacuum preloading.
Described pre-if described long plastic draining plate height is higher than hydraulic reclamation soil layer absolute altitude and utilizes that the colligation of framed bent bamboo pole is fixing to be realized.
Described pre-if described long plastic draining plate height is higher than hydraulic reclamation soil layer absolute altitude and utilizes that the steel pipe frame colligation is fixing to be realized.
Behind described vacuum preloading, carry out the preloading stockpile and carry precompressed.
Described preloading material for the slag of delaying, banket and/or water.
Described length or short plastic draining board top are provided with horizontal sand cushion, and the interval is embedded with chimney filter in described horizontal sand cushion.
Advantage of the present invention is, overcome the regional minute multistep of existing traditional deep level of processing zone and non-deep level of processing and process the shortcoming that puts in place, can utilize barged-in fill to accelerate the consolidation settlement of deep Soft Soil Layer as load during the hydraulic reclamation, can process in a step and put in place, reduced the tradition minute multistep problem that reprocessing produces wastes that puts in place, reached the reduction of erection time, reduced the purpose of cost, the harmonious development of promoted to reclaim fields from the sea regional municipal engineering treatment of soft foundation and urban environment and natural resource.
Description of drawings
Fig. 1 is construction part process flow diagram of the present invention;
Fig. 2 is construction part process flow diagram of the present invention;
Fig. 3 is the structural representation of the present invention before hydraulic reclamation;
Fig. 4 is the structural representation of the present invention behind hydraulic reclamation.
The specific embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
Fig. 1 and Fig. 2 consist of whole construction flow chart of the present invention.
Such as Fig. 1-4, mark 1-8 is respectively among the figure: long plastic draining board 1, preloading material 2, sand cushion 3, short plastic draining board 4, Soft Soil Layer 5, hydraulic reclamation soil layer 6, non-deep level of processing zone 7, deep level of processing zone 8.
Embodiment: shown in Fig. 3,4, present embodiment is specifically related to a kind of regional soft-soil foundation treatment method of reclaiming fields from the sea, wherein soft foundation is made of Soft Soil Layer 5 and the after-blow fill stratum 6 that is covered on the Soft Soil Layer 5, the zone of reclaiming fields from the sea comprises deep level of processing zone 8 and non-deep level of processing zone 7, deep level of processing zone 8 is road area, therefore need to carry out deep layer soft soil foundation and process.The method adopts long and short plastic draining board 1,4 in conjunction with the vacuum-surcharge preloading precompressed one step of regional soft foundation of reclaiming fields from the sea to be processed and puts in place, sets long plastic draining board 1 before namely the hydraulic reclamation soil layer in deep level of processing zone 86 forms and utilizes the framed bent bamboo pole or steel pipe frame colligation reservation exceeds hydraulic reclamation soil layer 6 absolute altitude 0.5m; After treating that hydraulic reclamation soil layer 6 forms, set short plastic draining board 4 in non-deep level of processing zone 7; Vacuum preloading is carried out in last large tracts of land subregion, and incorporation engineering need to continue to utilize the slag of delaying, bankets in the vacuum diaphragm in deep level of processing zone 8 simultaneously, the preloading material 2 such as water carries out preloading.
Shown in Fig. 1-4, below for reclaiming fields from the sea the Specific construction flow process of regional soft-soil foundation treatment method:
1. at first measure unwrapping wire; Removing Soft Soil Layer 5 top layers are ploughed and are planted soil, discharging fish pond water, the floating silt of removing; Simultaneously by designing requirement leveling place.
2. vertically set long plastic draining board 1 in that the Soft Soil Layer 5 in deep level of processing zone 8 is interior, its length is 15～20m, in Soft Soil Layer 5, plug simultaneously bamboo pole framed bent or steel pipe frame, described bamboo pole framed bent or steel pipe frame and long plastic draining board 1 lashing be in order to fixed length plastic draining board 1, the height of long plastic draining board 1 reserved exceed the hydraulic reclamation soil layer 6 design elevation 0.5m behind the hydraulic reclamation.
3. carry out the hydraulic reclamation operation at Soft Soil Layer 5, make the absolute altitude of hydraulic reclamation soil layer 6 reach the design elevation value, can utilize barged-in fill to accelerate the consolidation settlement of deep Soft Soil Layer 5 as load during the hydraulic reclamation; And at the thick sand cushion 3 of hydraulic reclamation soil layer 6 laying 20cm.
4. after treating that hydraulic reclamation soil layer 6 forms, pull out described bamboo pole framed bent or steel pipe frame in deep level of processing zone 8; Simultaneously set short plastic draining board 4 in non-deep level of processing zone 7, the length of short plastic draining board 4 is 3～8m; Re-lay the thick sand cushion of second layer 20cm 3, dig the sealing ditch thereafter.
5. excavate thereafter the vacuum line groove, lay master, a chimney filter of level within it, vaccum-pumping equipment is installed and is buried underground the vacuum gauge head.
6. lay the first floor geotextiles at sand cushion 3, lay two layers of diaphragm seal in described geotextiles more subsequently; Go out described diaphragm seal and connect vaccum-pumping equipment, the described sealing ditch of backfill; Examination vacuumizes, and checks the sealing system performance; Lay afterwards second layer geotextiles; Absolute altitude before settlement observation staff, lateral displacement stake being set and measuring precompressed.
7. carry out vacuum preloading at Zone Full by described vaccum-pumping equipment, keep vacuum 80Kpa; In deep level of processing zone 8, to lay the 3rd layer of sand cushion that 40cm is thick 3, and carry out the piling prepressing of preloading material 2 thereon, preloading material 2 loading speeds are unsuitable too fast, otherwise can cause foundation instability; By described settlement observation target observation, calculate that the soil solidifying degree can stop to load after reaching 90%.
8. continue observation skirt piles displacement and surface settlement; After soft foundation reached the predetermined degree of consolidation, construction finished.
Require specific as follows for the raw material device that adopts in the present embodiment:
(1) bamboo pole framed bent: should select hard tall and straight 10 cun or 12 cun bamboo poles, level is not less than 0.5m to lap length, and with ageing-resistantly, water-fast soak, corrosion resistant tough and tensile nylon rope colligation.
(2) horizontal sand cushion 3: used sand should be good, the scleroid medium coarse sand of grating, and mud content is less than 1%.
(3) vacuum preloading: vaccum-pumping equipment adopts jet vacuum pump, every precompressed zone (1500 ~ 2000m
2) two vacuum pumps are set at least.
The vacuum line tie point should strictly seal, and flap valve and pipe valve should be set, in order to avoid vacuum very fast reduction after termination of pumping under the film.
The chimney filter level adopts the forms such as comb teeth-shaped or featheriness to distribution.Chimney filter is arranged in the sand mat of subgrade 3, and 100 ~ 200mm sand covering layer should be arranged on it.Chimney filter adopts plastic pipe, and pipe is outer around galvanized wire, the filtering materials such as outsourcing nylon yarn or geotextile.
Ageing resistace is good in order to adopt for diaphragm seal, good toughness, the special large tracts of land plastic sheeting of gas impermeable material that anti-penetration capacity is strong.The flat overlap joint that palpus stitches with two heat seals during the diaphragm seal heat seal, lap length should be greater than 20mm.Diaphragm seal should be laid three layers, and the coverlay periphery can adopt the ditching folding to spread, tile and seal with cover methods such as covering water on water and the film in clay flanging, the sealing ditch comprehensively.Vacuum should remain on more than the 80kPa under the film.
(4) the preloading material 2: preloading material 2 can be delay slag, banket or water.
The used slag of delaying is the rubble after the explosion, and particle diameter is larger, is native stone mixture, and greater than 70%, but the maximum particle diameter of stone is not more than 100mm to particle diameter greater than the stone content of 40mm;
Used banketing as banketing of being formed by one or more materials such as gravelly soil, sand, silt and cohesive soils, wherein free from foreign meter or seldom impure.
Institute's water is not acrid water; After beginning to vacuumize, the water that draws up can be guided on the diaphragm seal and carry out piling prepressing as preloading material 2.
The following difference on effect of introducing above-described embodiment method and prior art engineering according to concrete engineering.
Certain regional engineering of reclaiming fields from the sea, place Quaternary system overburden cover reaches 80-100m deeply, and its middle and upper part 20m is mud class weak soil, is mainly mud and the mucky soil of estuarine facies and marine sediment.Field trial and laboratory soil test show that most areas bury clay distribution is followed successively by from top to bottom: mud, thickness 10-20m; Silt soil strata, thickness 5-10m; Mostly be clay, silty clay, rubble and circle whetstone etc. under it than hardpan.
This project first phase bid section adopts the processing method of prior art, begins hydraulic reclamation in March, 2009, and beginning in June, 2009 successively, subregion adopts vacuum method to carry out the shallow layer soft ground processing.November 2 in 2010, bid section was finished whole treatments of soft foundation.In March, 2011, road construction unit marched into the arena, and carried out the treatment of soft foundation of road area deep layer, adopted preloading.
Former scheme has been carried out after-treatment for road area, and namely first large tracts of land shallow layer soft ground is processed, and road area carries out deep level of processing afterwards.Not only the duration longer, and the after-treatment expense is higher.
The above-mentioned regional engineering second phase and the third phase ground of reclaiming fields from the sea processed the scheme adopted present embodiment.Shown in Fig. 3,4, in the construction, before the hydraulic reclamation, be to plug the long plastic draining board 1 that length is 20m in the road area in the deep level of processing zone, and utilize bamboo pole framed bent or steel pipe frame colligation to fix, make the hydraulic reclamation soil layer 6 absolute altitude 0.5m after long plastic draining board 1 reservation highly exceeds hydraulic reclamation; After hydraulic reclamation was finished, plugging length in non-deep level of processing zone was the short plastic draining board 4 of 6m; Adopt Vacuum-loading Pre-pressing Method to process in deep level of processing zone 8 at last; Adopt vacuum method to process in non-deep level of processing zone 7.Construction is 3 months before the hydraulic reclamation, dredge fill 3 months, processing reaches designing requirement with regard to Zone Full only to have used 10 months after hydraulic reclamation is finished, adopt the present embodiment scheme and not only can save the duration more than 8 months owing to adopted step processing to compare with above-mentioned first stage of the project, saved especially the about 150 yuan/m of expense of reprocessing road area
2
The regional municipal engineering soft-soil foundation treatment method of reclaiming fields from the sea of the present invention has obvious technical characterstic: can process putting in place a step, can utilize barged-in fill to accelerate the consolidation settlement of deep Soft Soil Layer as load during the hydraulic reclamation, save the duration, reduce cost, reduced the conventional minute multistep problem that reprocessing wastes that puts in place.With respect to the tradition regional municipal engineering soft-soil foundation treatment method of reclaiming fields from the sea, settle the processing scheme cost saving at one go and reach closely 40%, and saved the duration more than 30%, economic and social benefits are very remarkable, and duration of the present invention and expense are obviously saved.In general, the regional municipal engineering treatment of soft foundation new concept of reclaiming fields from the sea that the present invention proposes, has novelty, and reached the reduction of erection time, reduced the purpose of cost, some blank in the domestic regional municipal engineering Soft Ground field of reclaiming fields from the sea have been filled up, the harmonious development of promoted to reclaim fields from the sea regional municipal engineering treatment of soft foundation and urban environment and natural resource.
Claims (6)
1. regional soft-soil foundation treatment method of reclaiming fields from the sea, described soft foundation is made of Soft Soil Layer and the after-blow fill stratum that is covered on the described Soft Soil Layer, described zone comprises deep level of processing zone and non-deep level of processing zone, it is characterized in that described processing method comprises the steps: at least in described deep level of processing zone, before forming, the hydraulic reclamation soil layer sets long plastic draining board, and pre-if described long plastic draining plate height is higher than hydraulic reclamation soil layer absolute altitude; Finishing afterwards the hydraulic reclamation soil layer forms; Set short plastic draining board in non-deep level of processing zone afterwards; Last large tracts of land piecemeal carries out vacuum preloading.
2. a kind of regional soft-soil foundation treatment method of reclaiming fields from the sea according to claim 1 is characterized in that described pre-if described long plastic draining plate height is higher than hydraulic reclamation soil layer absolute altitude and utilizes that the colligation of framed bent bamboo pole is fixing to be realized.
3. a kind of regional soft-soil foundation treatment method of reclaiming fields from the sea according to claim 1 is characterized in that described pre-if described long plastic draining plate height is higher than hydraulic reclamation soil layer absolute altitude and utilizes that the steel pipe frame colligation is fixing to be realized.
4. a kind of regional soft-soil foundation treatment method of reclaiming fields from the sea according to claim 1 is characterized in that behind described vacuum preloading, carries out the preloading stockpile and carries precompressed.
5. a kind of regional soft-soil foundation treatment method of reclaiming fields from the sea according to claim 4, it is characterized in that described preloading material for the slag of delaying, banket and/or water.
6. a kind of regional soft-soil foundation treatment method of reclaiming fields from the sea according to claim 1 is characterized in that described length or short plastic draining board top are provided with horizontal sand cushion, and the interval is embedded with chimney filter in described horizontal sand cushion.
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| CN103243704A (en) * | 2013-05-02 | 2013-08-14 | 浙江大学舟山海洋研究中心 | Shallow mud foundation treatment method |
| CN103485325A (en) * | 2013-09-29 | 2014-01-01 | 中铁港航局集团有限公司 | Extra-large area vacuum preloading construction method for soft foundation reinforcement treatment |
| CN104120711A (en) * | 2014-06-13 | 2014-10-29 | 宁波高新区围海工程技术开发有限公司 | Structure and method for conducting reinforcing processing on soft foundation by combining surcharge preloading and vacuum preloading |
| CN104264559A (en) * | 2014-09-24 | 2015-01-07 | 上海市政工程设计研究总院（集团）有限公司 | Vacuum preloading roadbed processing device and vacuum preloading roadbed construction method |
| CN104652413A (en) * | 2015-01-05 | 2015-05-27 | 王军 | Novel beach sludge roadbed treatment method |
| CN104775414A (en) * | 2015-03-24 | 2015-07-15 | 华中科技大学 | Super-soft dredger fill surface layer solidification crusting and foundation treatment method |
| CN106872297A (en) * | 2017-01-05 | 2017-06-20 | 沈阳建筑大学 | The circulation compression assay method of the slag soil-stone material modulus of resilience of being delayed based on moisture content |
| CN109083100A (en) * | 2018-08-28 | 2018-12-25 | 中交上海航道局有限公司 | A kind of channel excavation construction technology for blowing mud Cheng Luhou |
| CN110185022A (en) * | 2019-07-10 | 2019-08-30 | 中铁二局第一工程有限公司 | A kind of constructing structure and method of plastic draining board and CFG treatment of soft foundation changeover portions |
| CN110485436A (en) * | 2019-07-24 | 2019-11-22 | 浙江大学 | Engineering slurry and dregs alternating layers backfill pit foundation structure and reconstruction ground based method |
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| CN103243704A (en) * | 2013-05-02 | 2013-08-14 | 浙江大学舟山海洋研究中心 | Shallow mud foundation treatment method |
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| CN103485325A (en) * | 2013-09-29 | 2014-01-01 | 中铁港航局集团有限公司 | Extra-large area vacuum preloading construction method for soft foundation reinforcement treatment |
| CN104120711A (en) * | 2014-06-13 | 2014-10-29 | 宁波高新区围海工程技术开发有限公司 | Structure and method for conducting reinforcing processing on soft foundation by combining surcharge preloading and vacuum preloading |
| CN104264559A (en) * | 2014-09-24 | 2015-01-07 | 上海市政工程设计研究总院（集团）有限公司 | Vacuum preloading roadbed processing device and vacuum preloading roadbed construction method |
| CN104652413A (en) * | 2015-01-05 | 2015-05-27 | 王军 | Novel beach sludge roadbed treatment method |
| CN104775414A (en) * | 2015-03-24 | 2015-07-15 | 华中科技大学 | Super-soft dredger fill surface layer solidification crusting and foundation treatment method |
| CN104775414B (en) * | 2015-03-24 | 2017-05-03 | 华中科技大学 | Super-soft dredger fill surface layer solidification crusting and foundation treatment method |
| CN106872297A (en) * | 2017-01-05 | 2017-06-20 | 沈阳建筑大学 | The circulation compression assay method of the slag soil-stone material modulus of resilience of being delayed based on moisture content |
| CN109083100A (en) * | 2018-08-28 | 2018-12-25 | 中交上海航道局有限公司 | A kind of channel excavation construction technology for blowing mud Cheng Luhou |
| CN110185022A (en) * | 2019-07-10 | 2019-08-30 | 中铁二局第一工程有限公司 | A kind of constructing structure and method of plastic draining board and CFG treatment of soft foundation changeover portions |
| CN110485436A (en) * | 2019-07-24 | 2019-11-22 | 浙江大学 | Engineering slurry and dregs alternating layers backfill pit foundation structure and reconstruction ground based method |
| CN110485436B (en) * | 2019-07-24 | 2021-03-05 | 浙江大学 | Engineering slurry and slag soil interbedded backfill pit foundation structure and foundation reconstruction method |
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