CN101591905B - Newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method - Google Patents
Newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method Download PDFInfo
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- CN101591905B CN101591905B CN2009100337866A CN200910033786A CN101591905B CN 101591905 B CN101591905 B CN 101591905B CN 2009100337866 A CN2009100337866 A CN 2009100337866A CN 200910033786 A CN200910033786 A CN 200910033786A CN 101591905 B CN101591905 B CN 101591905B
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Abstract
The invention relates to a newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method. The method comprises the following steps of: 1, paving one to two layers of geotextile on the surface layer of the newly hydraulically filled mucky soil soft foundation; 2, connecting plastic drain boards and branch pipes on land; 3, inserting the plastic drain boards; 4, connecting the branch pipes and a main pipe, and connecting the main pipe and a membrane-discharge device; 5, paving a straw filter layer, namely paving one to two layers of straw braid between thebranch pipes to form the straw filter layer, wherein the thickness of the single layer of straw braid is between 10 and 20cm; 6, arranging observation instruments; 7, paving one to two layers of geotextile again; and 8, arranging a surface layer membrane sealing system, and connecting the membrane-discharge device and a vacuum pump system. To sum up, the method not only ensures the consolidation treatment of ultra-soft foundation, particularly the newly hydraulically filled mucky soil, but also saves a large amount of sandstone because the sand bed is not used in the construction method; moreover, because the straw braid can be recycled, the construction cost is lowered; and the radical problem that the newly hydraulically filled mucky soil and the ultra-soft soil cannot be put in construction is solved.
Description
(1) technical field
The present invention relates to a kind of large-area soft foundation handles.Be specially adapted to the quick consolidation process of new hydraulically filled sludge matter soil ultra-soft foundation.Possession base processing technology field.
(2) background technology
At present, along with the fast development of coastal area, the method for utilizing beach and reclamation by pumping filling is to solve the industrial land deficiency.For the processing of this type of soil property, successful Application " vacuum method " is handled at present.Yet, because new hydraulically filled sludge matter soil generally is the mucky soil of " three high one is low " (being high-moisture, high-compressibility, high sensitivity, low-intensity), after hydraulic reclamation is finished, the water content height, intensity is low, and personnel can't enter.
Vacuum method generally is to take to treat that it is fixed naturally, has that personnel just enter the exploitation construction after the certain intensity.Commonly used have low position vacuum preloading method, directly discharging type vacuum prepressing method, preloading to carry out consolidation process in conjunction with vacuum preloading etc.Vacuum method need be provided with sand cushion, and lay its difficulty of sand cushion in machinery, the unapproachable place of equipment very big, restricted the application of vacuum method at three high one low mucky soils of new hydraulic reclamation.
Because new hydraulic reclamation " three high is low " mucky soil can't solve the difficulty of sand cushion, therefore produced and do not needed sand cushion, or with the directly discharging type vacuum prepressing method of cloth for sand, but the result of its reinforcing is not if any the effect of " vacuum preloading " consolidation process of sand cushion.Trace it to its cause, not being both the former and having adopted the thick sand cushion of 30～50cm of vacuum preloading and in line precompressed, the latter has replaced sand cushion with 1～2 layer of geotextiles, final result is not fully if any the vacuum preloading of sand cushion, the crucial thickness difference that just in the precompressed process, forms vacuum packet, the just thickness of sand cushion and the ability of reinforcing that do not had this thickness effect under the vacuum diaphragm.
At the mucky soil of present coastal area " three high one is low ", particularly handle in the place of new hydraulically filled sludge matter soil, is that sand cushion can't enter required construction area on the one hand, makes the traditional vacuum precompressed lack scope for their abilities; On the other hand, without its final treatment effect of directly discharging type vacuum prepressing of sand cushion again not if any the vacuum preloading of sand cushion; Therefore, the ultra-soft foundation of the mucky soil of present coastal area " three high is low " is reinforced, particularly new hydraulically filled sludge matter soil ultra-soft foundation is handled being absorbed in predicament.
(3) summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, provide a kind of and can't enter under the situation in place, also can reach the newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method of required reinforcement ability at machinery, equipment.
The object of the present invention is achieved like this: a kind of newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method, and described method comprises following method step:
Step 1, lay 1～2 layer of geotextiles at new hydraulically filled sludge matter soil surface layer of soft foundation, the geotextiles of employing is 150g/m
2～200g/m
2The short fiber non-woven geotextile carries the constructor with pontoon or kickboard when laying geotextiles and enters construction area;
Step 2, connect plastic draining board and arm on land
Plastic draining board is directly tied up on arm, and tight with letter silk letter, and the spacing of plastic draining board is 0.6～1.0m;
Step 3, slotting plastic draining board
Arm is with after band drain is connected on land, be transported into construction area by pontoon or kickboard, being arranged in into strips needs construction area, the spacing of arm and arm is 0.8～1.0m, by manually,, plastic draining board is inserted 4.0～6.0m under the mud face with wooden stick or bamboo bar, again arm is pressed into 5～10mm under the mud face, this moment the 5～10mm that also should thereupon sink of the geotextiles below the arm;
Step 4, arm connect to be responsible for, and is responsible for to connect film device
After slotting plastic draining board is finished, arm is connected the person in charge, the person in charge connects film device, and being responsible for and adopting wall thickness is that 3.0mm, diameter are the pvc pipe material of 75～100mm, is responsible for that spacing 12～18m being set;
Step 5, place mat grass filtering layer
Lay 1～2 layer of straw braid between arm and arm, constitute careless filtering layer, straw braid thickness in monolayer is 10～20cm;
Step 6, layout observation instrument
Step 7, repave 1～2 layer of geotextiles of pad
After needing construction area place mat grass filtering layer to finish, repave 1～2 layer of 150g/m thereon
2Geotextiles;
Step 8, layout top layer diaphragm seal system
Manually two-layer diaphragm seal layering is laid and cover the whole construction area that needs, manually will imbed around the diaphragm seal in the sealing ditch then, with mud, clay backfilling sealing ditch and compacting;
Step 9, go out film device and be connected with vacuum pump system.
The invention has the beneficial effects as follows:
1, energy-conserving and environment-protective are turned waste into wealth.
The general sand filtration bed thickness of traditional vacuum precompressed is 0.5m, and area just needs with medium coarse sand about 5000 cubes as 10,000 squares of vacuum preloadings, just needs with sand about 3200 tons, haulage vehicle by 10 tons of load-carryings just needs 320 train numbers, as producing the processing of fried mountain by opening, not only expense is big, and not environmental protection is not energy-conservation.In fact because ultra-soft place haulage vehicle can't enter, and sand cushion also can't be spread, therefore make the traditional vacuum precompressed to realize.The present invention is with the sand filter blanket in the straw knitting replacement vacuum method, make it to become careless filtering layer, because the straw braid is in light weight, be easy to transportation, the straw braid that area is 10,000 squares, the haulage vehicle that the usefulness load-carrying is 10 tons is 1～2 car only, the straw bag of strip or tubular or straw screen or mat, the a dead lift place mat can be effective fully in the need construction area.Particularly now straw has been burnt not only contaminated environment, and waste resource to fire in harvesting back because the straw sales difficulty in the rural area therefore.Along with the enforcement of this worker method, therefore there is a large amount of straw to be applied to engineering, will reclaim for the rural area solves straw, turn waste into wealth.
2, fundamentally solve the key technology of vacuum preloading
This job practices has changed the traditional vacuum precompressed to be needed to form the required certain bed thickness vacuum pneumatic bag of precompressed, 2～4 layers of 150g/m of place mat on new hydraulically filled sludge matter soil with sand cushion
2Geotextiles, grass utilizes geotextiles interlayer and straw plaited to produce the required vacuum pneumatic bag of precompressed for sand then, has solved the unapproachable difficult problem of new hydraulically filled sludge matter soil sand material, has saved a large amount of sandstone material.
3, rapidly and efficiently, established solid foundation for accelerating coastal development
To the place of new hydraulically filled sludge ultra-soft foundation, because personnel's equipment can't enter, therefore hindered the development rate of coastal area behind the hydraulic reclamation, and this worker method is at the characteristics of new hydraulically filled sludge ultra-soft foundation, adopt the method for manual plate, improve bearing capacity fast, make equipment can drop into construction.In work progress, can adjust the length of plastic draining board as required,, solve the difficulty of ultra-soft foundation consolidation process by adjustment make it to be fit to differently the to verify demand of different bearer power of ground.
4, reduce construction costs, reduce labor intensity
Owing to for sand, made full use of the recyclable utilization of straw knitting with grass, be easy to carrying and stack, characteristics such as perishable loss not, therefore having overcome sand filter blanket can't enter construction area, needs with machinery, even can't recycle and recycle the big shortcoming of its loss in the work progress.When substituting sand filter blanket with straw product, after finishing, the need construction area straw product can be re-used in next round or next construction site, greatly reduce construction cost.
To sum up, the inventive method can be guaranteed the particularly consolidation process of new hydraulically filled sludge matter soil of ultra-soft foundation, and since in job practices without sand cushion, saved a large amount of sandstone material.Moreover, because the recyclable utilization of straw knitting has reduced construction costs.The most essential is and solved new hydraulically filled sludge and ultra-soft geology can't enter the root problem of construction.
(4) description of drawings
Fig. 1 is the facade simplified schematic diagram of the inventive method.
Fig. 2 is the detail side elevation of the inventive method.
(5) specific embodiment
Referring to Fig. 1, the newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method that the present invention relates to, described method comprises following method step:
Step 1, lay 1～2 layer of geotextiles on need construction area top layer
The geotextiles that adopts is 150g/m
2～200g/m
2Short fiber non-woven geotextile, its effect are the effects that stops the mud influence low-pressure drainage system, guarantee the vacuum of follow-up precompressed simultaneously.
Because three high one low characteristics of new hydraulically filled sludge matter soil, the personnel equipment of making can't enter, and therefore, lays geotextiles and can take the problem that enters construction area with pontoon or kickboard solution personnel.
Step 2, land connect plastic draining board and arm
Enter construction area by pontoon or kickboard, can arrange drainage system after the geotextiles of shop, drainage system is by the plastic draining board connecting branch, and arm adopts the ripple infiltration type pvc pipe of diameter 50～63mm, outsourcing geotechnique filter cloth; The length of arm is 20～50m, can determine the length of every arm according to the situation of need disposal field.Plastic draining board is directly tied up on arm, and with letter silk letter tightly on arm; The spacing that is connected the plastic draining board on the arm is 0.6～1.0m, and concrete spacing can be determined according to the water content and the transmission coefficient of soil property.
Step 3, slotting plastic draining board
Arm is transported into construction area with after band drain is connected on land by pontoon or kickboard, and being arranged in into strips needs construction area, and the spacing of arm and arm is 0.8～1.0m, specifically determines the spacing of arm according to soil body water content and transmission coefficient.
By manually, utilize the wooden stick or the bamboo bar of certain-length, plastic draining board is inserted under the mud face of certain depth.Because the characteristic of new hydraulically filled sludge matter soil " three high one is low " therefore can utilize the hand plate that plastic draining board is inserted certain degree of depth fully, hand plate insertion depth can reach 4.0～6.0m.Plastic draining board on every arm is gently pressed with the arm that is exposed on the geotextiles after finishing according to the spacing plate that has connected, makes it be pressed into 5～10mm under the mud face, the 5～10mm that also should thereupon sink of the geotextiles below this moment arm.
Step 4, arm connect to be responsible for, and is responsible for to connect film device
After each needs the construction area plastic draining board to finish, be about to arm and connect the person in charge, the person in charge connects film device.Being responsible for and adopting wall thickness is that 3.0mm, diameter are 75～100 pvc pipe material, is responsible for that spacing 12～18m being set.
Step 5, place mat grass filtering layer
The grass filtering layer is meant the straw braid layer, common on the straw braid market have straw bag, a straw screen or mat etc., such straw braid price is low, permeability is good, and thickness in monolayer is 10～20cm, can be used for replacing sand filter blanket fully, and the straw braid into strips or drum, convenient transportation is easy to reclaim, and is difficult for loss.
Between arm and arm, lay 1～2 layer of straw braid, replace sand filter blanket (seeing Fig. 1, Fig. 2).
Step 6, layout observation instrument
In order in work progress, to observe its effect that vacuumizes at any time, therefore, when laying careless filtering layer, require to arrange vacuum meter and other plant and instrument under the required film according to detecting.
Step 7, repave 1～2 layer of geotextiles of pad
After needing construction area place mat grass filtering layer to finish, repave 1～2 layer of 150g/m thereon
2Geotextiles, its effect is that branch drain and the person in charge and deformation of thin membrane did not damage during the diaphragm seal of next step covering of protection was not vacuumized by or not the place, has guaranteed the quality that vacuumizes.
Step 8, layout top layer diaphragm seal system
Manually with two-layer diaphragm seal (polyethylene or polyvinyl chloride film, thick 0.12mm～0.14mm, weld and transport to scene with hot sticky method according to required area size in factory) the whole construction area that needs of layering laying covering, to guarantee that not producing vacuum diaphragm because of settling amount is excessive during vacuumizing breaks.Should note simultaneously diaphragm seal around, enough super spacious and comfortable amounts (3～5m) should be arranged.Manually with imbedding around the diaphragm seal in the sealing ditch behind at least 2～4m, use mud then, clay backfilling seals ditch and compacting.
Step 9 goes out film device and is connected with vacuum pump system.
Claims (1)
1. newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method, it is characterized in that: described method comprises following method step:
Step 1, lay 1～2 layer of geotextiles at new hydraulically filled sludge matter soil surface layer of soft foundation, the geotextiles of employing is 150g/m
2～200g/m
2The short fiber non-woven geotextile carries the constructor with pontoon or kickboard when laying geotextiles and enters construction area;
Step 2, connect plastic draining board and arm on land
Plastic draining board is directly tied up on arm, and tightens with pricking silk, and the spacing of plastic draining board is 0.6～1.0m;
Step 3, slotting plastic draining board
Arm is with after band drain is connected on land, be transported into construction area by pontoon or kickboard, being arranged in into strips needs construction area, the spacing of arm and arm is 0.8～1.0m, by manually,, plastic draining board is inserted 4.0～6.0m under the mud face with wooden stick or bamboo bar, again arm is pressed into 5～10mm under the mud face, this moment the 5～10mm that also should thereupon sink of the geotextiles below the arm;
Step 4, arm connect to be responsible for, and is responsible for to connect film device
After slotting plastic draining board is finished, arm is connected the person in charge, the person in charge connects film device, and being responsible for and adopting wall thickness is that 3.0mm, diameter are the pvc pipe material of 75～100mm, is responsible for that spacing 12～18m being set;
Step 5, place mat grass filtering layer
Lay 1～2 layer of straw braid between arm and arm, constitute careless filtering layer, straw braid thickness in monolayer is 10～20cm;
Step 6, layout observation instrument
Step 7, repave 1～2 layer of geotextiles of pad
After needing construction area place mat grass filtering layer to finish, repave 1～2 layer of 150g/m thereon
2Geotextiles;
Step 8, layout top layer diaphragm seal system
Manually two-layer diaphragm seal layering is laid and cover the whole construction area that needs, manually will imbed around the diaphragm seal in the sealing ditch then, with mud, clay backfilling sealing ditch and compacting;
Step 9, go out film device and be connected with vacuum pump system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100337866A CN101591905B (en) | 2009-06-03 | 2009-06-03 | Newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100337866A CN101591905B (en) | 2009-06-03 | 2009-06-03 | Newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method |
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| CN101591905A CN101591905A (en) | 2009-12-02 |
| CN101591905B true CN101591905B (en) | 2010-12-29 |
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| CN2009100337866A Expired - Fee Related CN101591905B (en) | 2009-06-03 | 2009-06-03 | Newly hydraulically filled mucky soil soft foundation straw mattress preloading consolidation method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736735B (en) * | 2009-12-22 | 2011-06-22 | 叶吉 | Composite reinforcing method for combining soft foundation light well point pipe with plastic drainage plate |
| CN101806057B (en) * | 2010-04-28 | 2012-03-28 | 河海大学 | Immediate processing method for hydraulic fill of ultra-soft foundation by modified vacuum preloading and water-covering preloading |
| CN102191771B (en) * | 2010-08-23 | 2013-11-06 | 上海大学 | Method for solidifying and processing soft soil foundation by draining water from plant cushion layer in vacuum |
| CN101942827B (en) * | 2010-10-14 | 2012-05-30 | 中交一航局第四工程有限公司 | Construction method of ultrasoft foundation raft working cushion layer |
| CN103469787A (en) * | 2012-06-08 | 2013-12-25 | 深圳市工勘岩土工程有限公司 | Support structure for walking of constructors in sludge preloading processing |
| CN102704458A (en) * | 2012-06-27 | 2012-10-03 | 河海大学 | Sand-free cushion layer vacuum-surcharge preloading reinforcement device and method for soft ground |
| CN107870128A (en) * | 2017-01-05 | 2018-04-03 | 天津大学 | A kind of mudding formula vacuum preloading laboratory test model |
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Granted publication date: 20101229 Termination date: 20160603 |