CN102337739A - Large-clearance non-sand (sand-free) vacuum preloading soft soil foundation processing method - Google Patents
Large-clearance non-sand (sand-free) vacuum preloading soft soil foundation processing method Download PDFInfo
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- CN102337739A CN102337739A CN2010102305631A CN201010230563A CN102337739A CN 102337739 A CN102337739 A CN 102337739A CN 2010102305631 A CN2010102305631 A CN 2010102305631A CN 201010230563 A CN201010230563 A CN 201010230563A CN 102337739 A CN102337739 A CN 102337739A
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Abstract
The invention relates to a large-clearance non-sand (sand-free) vacuum preloading soft soil foundation processing method, which can be used for transferring atmospheric pressure to the surface of a soft soil layer to be reinforced, wherein a large-clearance non-sand material is used as a transfer medium. The large-clearance non-sand material can adopt non-sand materials, such as large-clearance combined structure, plastic foams, PVC (polyvinyl chloride) pressure-resisting pipes, logs and the like. The large-clearance non-sand (sand-free) vacuum preloading soft soil foundation processing method is suitable for design and construction of foundations of airport runways, highways, harbors, dams and the like and sea reclamation soft soil foundation processing and the like, in particular for processing supersoft soil foundations of dredge fill and new sludge accumulation and natural soft soil foundations of sludge, very soft silty clay, and the like.
Description
Technical field
The present invention relates to hydraulic reclamation dredging weak soil, the method handled of the non-sand class in big space (no sand) vacuum pre-pressed soft soil foundation of natural weak soils such as the super soft ground piled up of mud and mud, mud matter silty clay recently.
Background technology
The object of construction production of natural weak soils such as the super soft ground of the weak soil of hydraulic reclamation dredging at present, mud accumulation recently and mud, mud matter silty clay is more and more; Scale is increasing; The general vacuum preloading method that adopts is carried out the ground processing; Conventional vacuum preloading method is laid one deck sand cushion as the horizontal drainage passage on the face of land, sand vacuum preloading method is promptly arranged.Along with constantly carrying out of engineering construction, the sand source is more and more nervous, China certain areas even have an area of tens kilometers and do not have the sand source.Geotextile is adopted in existing many at present areas; For example drainage blanket such as nonwoven, the GSZ sand cushion that replaces the sand vacuum preloading is arranged is as the horizontal drainage passage; Promptly there is not sand vacuum preloading method; This no sand vacuum preloading processing method is to have the sand vacuum method to improve to tradition, need not lay sand mat of subgrade, after plugging plastic draining board on the disposal field; Every row or every at a distance from horizontal chimney filter passage of two plastic removal material band drains layout; And use connector that plastic draining board is exposed partly closely to be connected on the horizontal pipe, the thickness between ground surface and vacuum preloading film soffit is less, and its thickness is generally less than 5cm (not comprising main, as to prop up chimney filter diameter).The space of the horizontal drainage channel material that adopts is less; Even adopt the mesh in-plane void size of GSZ bigger; But the mesh of existing GSZ is less in the thickness direction void size; General thickness is vacuumizing the back because the vacuum preloading film has the trend of filling the space less than 5mm, and the space of the mesh of GSZ is littler.Less because of the thickness between ground surface and the vacuum preloading film, the vacuum preloading film often contacts with water in the whole process, is the partial vacuum state.Construction and result of the test show that existing no sand vacuum preloading method handles the back because to vacuumize effect in the chimney filter better vacuumizing, and form relative harder soil layer more among a small circle in the part by chimney filter position soil layer.Equally radially also form harder earth pillar relatively around the band drain; Soil layer leans on the nearlyer consolidation effect of distance of band drain good more; The consolidation effect transmission coefficient of earth pillar preferably reduces greatly; Hinder vacuum further to distance radially soil layer expansion far away, vacuum preloading finds after 4 months that the soil layer consolidation effect is relatively poor in addition at 15cm radially, can not satisfy the engineering construction needs.
Summary of the invention
The patent of the big non-sand class in space (no sand) vacuum pre-pressed soft soil foundation processing method is in weak soil, to set earlier vertical drainage passage such as plastic draining board, sand drain etc.; At the weak soil laminar surface horizontal drainage passage such as nonwoven, GSZ etc. are set again; Then the horizontal drainage system surfaces increase a layer thickness in the big space of 5cm-200cm non-sand class material, last covering vacuum film also vacuumizes and carries out ground and handle.
The technical problem that this patent solves be through big space non-sand class material form this one deck of framework transmit medium the most at last atmospheric pressure be delivered to and need the weak soil laminar surface reinforced.Big space non-sand class material can adopt non-sand class materials such as combining structure, plastic foam, PVC pressure pipe, round log; The thickness of big space non-sand class material is at 5cm-200cm; The contact surface of guaranteeing big space non-sand class material and vacuum preloading film exceeds the water level in the vacuum preloading process; Be that the vacuum preloading film does not contact water level; Utilize the space of big space non-sand class material to form vacuum area, guarantee that atmosphere pressure energy passes on the framework that power that the big space non-sand class material of water level top forms transmits, and then be delivered to the weak soil surface through the horizontal drainage channel layer.Ground produces the discharging consolidation sedimentation under the atmospheric pressure effect; Underground water will rise to the face of land along the vertical drainage passage after the ground surface sedimentation; Simultaneously big space non-sand class material production is sunk, and when the space of big space non-sand class material was full of by water, face of land sealing film contacts with water level (supposed that the consolidation settlement amount of the soil body equals the water yield of discharge in the soil body; Do not consider the influence of other factors, the absolute altitude of water level is constant basically.Owing to sinking to driving sealing film, big space non-sand class material behind the land subsidence sinks on the one hand; Reduced distance between water level surface and the sealing film; The volume that the non-sand class material self in big on the other hand space gets in the water can make the water surface raise; Reduced distance between water level surface and the sealing film equally, these two factors cause face of land sealing film to contact with water level), at this moment atmospheric pressure acts on the surface of water level; Form the vacuum phenomenon of drawing water; Be delivered to the lip-deep atmospheric pressure of soft foundation and reduce greatly, need carry out draining midway this moment makes drawdown, after forming the space between water level surface and the sealing film, proceeds the vacuum preloading ground again and handles.Suppose that foundation settlement is less, it is less that sealing film sinks, and in vacuum preloading ground processing procedure, has between face of land sealing film and water level in the time of keeping discontiguous big space, just need not carry out draining midway.
This patent and present existing no sand vacuum preloading patent main difference point are:
First this patent adopted big space non-sand class material, after vacuumizing, has big space, and the definition in big space here refers to that the size of three directions of length of space or hole is all greater than 5mm; And the existing no sand vacuum preloading method size that sufficient length and width, a Senior Three direction are discontented with in the space of horizontal channel material under the vacuum preloading film after vacuumizing is all greater than 5mm.
There is the space of big space non-sand class material not possess the condition of drawing water between the extract opening of second this patent vacuum preloading and the large tracts of land water level, leans on the space of big space non-sand class material to form vacuum area; And form vacuum area in the horizontal drainage passage that is provided with in the master of existing no sand vacuum preloading method surface layer setting on the scene, a chimney filter and the weak soil, because the space of material possesses (or claiming drainage by suction) condition of drawing water of vacuum preloading for a short time.
Thirdly this patent does not form the vacuum area of negative pressure in surface water flat raft aquaporin and vertical drainage passage after vacuumizing, but in two zones, is full of by water; And existing no sand vacuum preloading progressively forms the vacuum area of negative pressure in horizontal drainage passage and vertical drainage passage after vacuumizing.
The 4th this patent keeps not contacting under the situation with water potential and do not draw water vacuumizing the face of land, back sealing film; Only intermittent extraction the out makes face of land sealing film and water level disengagement keep discontiguous low amounts of water when behind the water that vacuum preconsolidation is discharged, face of land sealing film being contacted with water potential; The water that all the other vacuum preconsolidations are discharged in the non-sand class material of big space can not be drawn out of: and the phenomenon generation of after vacuumizing, drawing water of existing no sand vacuum preloading; Not only extract the water in the water that exceeds the face of land, the horizontal drainage passage out, even maybe the part water in the vertical drainage passage be extracted out.
Though the 5th this patent vacuumizes under final vacuum pump or the jet pump extraction film and the formation of the air in space vacuum area between the water level; Be to have between face of land sealing film and the water level to keep discontiguous big space vacuum area; But because water level exceeds the face of land, vacuum area does not contact with the soil body; And existing no sand vacuum preloading contacts with the vertical drainage passage superficial part soil body on every side with the horizontal drainage passage bottom soil body vacuumizing the final vacuum zone, even possibly contact with inside soil body.
Description of drawings
Fig. 1 is the non-sand class in big space (no sand) vacuum pre-pressed soft soil foundation processing method sketch map.
The specific embodiment
Like Fig. 1, the big non-sand class in space (no sand) vacuum pre-pressed soft soil foundation processing method sketch map.Set the vertical drainage passage of 7 expressions in the weak soils such as the mud of 8 expressions of the first step in Fig. 1, mud matter silty clay; 7 can be plastic draining board, sand drain etc.; If place weakness is not easy to construction, set 7 again after the measures such as shop geotextiles or chaste tree basketry on can first ground on the scene.Second step, surface layer on the scene was laid the horizontal drainage passage of 5 expressions, like geotextile materials such as nonwoven, GSZs.Lay the big space non-sand class material of 2 expressions on the 3rd step surface layer horizontal drainage passage 5 on the scene; Big space non-sand class material 2 can adopt non-sand class materials such as combining structure, plastic foam, PVC pressure pipe, round log; Under the effect of 1 atmospheric pressure, have distortion, but non-sand class material still there is the big space of 6 expressions.The 4th step guaranteed that the big space non-sand class material 2 and the contact surface of vacuum preloading film 1 exceeded the water level of the expression of 4 in the vacuum preloading process; Be that vacuum preloading film 1 does not contact water level 4; Utilize the big space 6 of big space non-sand class material to form vacuum area; Guarantee that atmosphere pressure energy passes to the big space non-sand class material 2 of water level 4 tops, is delivered to the surface of pending weak soil layer 8 then through horizontal drainage passage 5.The 5th step was laid the sealing film of 1 expression, was connected to vacuum pump or the jet pump that vacuumizes through the connection mouth of pipe that vacuumizes under the 3 expression vacuum preloading films, carried out big space non-sand class vacuum preloading ground and handled.
Claims (9)
1. in soft foundation, set the vertical drainage passage, like plastic draining board, sand drain etc.
2. lay the horizontal drainage passage on the ground surface on the scene, like nonwoven, GSZ etc.
3. on the horizontal drainage passage of place, lay big space non-sand class material; Big space non-sand class material can adopt non-sand class materials such as combining structure, plastic foam, PVC pressure pipe, round log.
4. big space non-sand class material has distortion under the effect of 1 atmospheric pressure, but the still big space of non-sand class material, and the definition in the big space of this patent refers to that the size of three directions of length of space or hole is all greater than 5mm; The thickness of big space non-sand class material is generally between 5cm-200cm.
5. there is the space of big space non-sand class material not possess the condition of drawing water between the extract opening of vacuum preloading and the large tracts of land water level, leans on the space of big space non-sand class material to form vacuum area.
6. after vacuumizing, in surface water flat raft aquaporin and vertical drainage passage, do not form the vacuum area of negative pressure, but in two zones, be full of by water.
7. keep not contacting under the situation with water potential and do not draw water vacuumizing back face of land sealing film; Only intermittent extraction the out makes face of land sealing film and water level disengagement keep discontiguous low amounts of water when behind the water that vacuum preconsolidation is discharged, face of land sealing film being contacted with water potential, and the water that all the other vacuum preconsolidations are discharged in the non-sand class material of big space can not be drawn out of.
8. though vacuumizing final vacuum pump or jet pump extracts under the film and the formation of the air in space vacuum area between the water level; Be to have between face of land sealing film and the water level to keep discontiguous big space vacuum area; But because water level exceeds the face of land, vacuum area does not contact with the soil body.
9. big space non-sand class material can be delivered to the surface of treating consolidation process weak soil layer to the atmospheric pressure on the sealing film of the face of land through the horizontal drainage passage smoothly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102305631A CN102337739A (en) | 2010-07-19 | 2010-07-19 | Large-clearance non-sand (sand-free) vacuum preloading soft soil foundation processing method |
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| CN2010102305631A CN102337739A (en) | 2010-07-19 | 2010-07-19 | Large-clearance non-sand (sand-free) vacuum preloading soft soil foundation processing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195067A (en) * | 2013-03-29 | 2013-07-10 | 中国十七冶集团有限公司 | Deep foundation pit muddy-silty clay cushion layer construction method |
| CN103806431A (en) * | 2012-11-09 | 2014-05-21 | 世盟国际股份有限公司 | Quick crusting structure for soft foundation reclamation and production construction method thereof |
| CN103924576A (en) * | 2013-01-15 | 2014-07-16 | 中冶集团武汉勘察研究院有限公司 | Intelligent control three-dimensional drainage vacuum preloading method for particle tailing ore reinforced fill dam |
-
2010
- 2010-07-19 CN CN2010102305631A patent/CN102337739A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103806431A (en) * | 2012-11-09 | 2014-05-21 | 世盟国际股份有限公司 | Quick crusting structure for soft foundation reclamation and production construction method thereof |
| CN103806431B (en) * | 2012-11-09 | 2016-05-11 | 世盟国际股份有限公司 | A kind of soft base is made ground crust structure and making engineering method thereof fast |
| CN103924576A (en) * | 2013-01-15 | 2014-07-16 | 中冶集团武汉勘察研究院有限公司 | Intelligent control three-dimensional drainage vacuum preloading method for particle tailing ore reinforced fill dam |
| CN103924576B (en) * | 2013-01-15 | 2016-12-28 | 中冶集团武汉勘察研究院有限公司 | A kind of fine tailings reinforcement fill dam Based Intelligent Control solid row oozes vacuum method |
| CN103195067A (en) * | 2013-03-29 | 2013-07-10 | 中国十七冶集团有限公司 | Deep foundation pit muddy-silty clay cushion layer construction method |
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Application publication date: 20120201 |