CN101906772A - Fast consolidation method of blow-filled soft soil for land reclamation - Google Patents
Fast consolidation method of blow-filled soft soil for land reclamation Download PDFInfo
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- CN101906772A CN101906772A CN 201010236279 CN201010236279A CN101906772A CN 101906772 A CN101906772 A CN 101906772A CN 201010236279 CN201010236279 CN 201010236279 CN 201010236279 A CN201010236279 A CN 201010236279A CN 101906772 A CN101906772 A CN 101906772A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007596 consolidation process Methods 0.000 title claims abstract description 14
- 239000004033 plastic Substances 0.000 claims abstract description 66
- 229920003023 plastic Polymers 0.000 claims abstract description 66
- 239000004744 fabric Substances 0.000 claims abstract description 36
- 238000010276 construction Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004746 geotextile Substances 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 239000011148 porous material Substances 0.000 claims abstract description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 34
- 238000012545 processing Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
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- 238000001514 detection method Methods 0.000 abstract description 5
- 238000007667 floating Methods 0.000 abstract 4
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- 238000011268 retreatment Methods 0.000 abstract 1
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- 206010057855 Hypotelorism of orbit Diseases 0.000 description 1
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Abstract
The invention relates to a fast consolidation method of blow-filled soft soil for land reclamation, comprising the following process steps of: erecting a floating bridge; paving a plastic woven cloth; paving a main pipe and a branch pipe; inserting a plastic drainage plate; embedding a joint and a vacuum degree meter of a vacuum pump and a pore pressure meter monitoring device; paving a geotextile; paving a vacuum film; distributing the vacuum pump and trying to vacuumize; vacuumizing; monitoring construction; and carrying out vacuum water covering united pre-loading and unloading detection, wherein the step of erecting the floating bridge comprises: erecting the floating bridge on the blow-filled soft soil requiring the treatment and building a construction platform and a channel on mud. The invention has the advantages that construction members carry out operations of paving the plastic woven cloth, inserting the plastic drainage plate, laying pipes, paving the geotextile and the like on the floating bridge, thereby the technical problem that the follow-up treatment on the new blow-filled soft soil cannot be instantly carried out by using the traditional soft soil foundation treatment technology is solved, and 2-5 years for consolidating the new blow-filled soft soil naturally before retreatment are saved.
Description
(1) technical field
The present invention relates to a kind of blow-filled soft soil for land reclamation quick consolidation method.Belong to the foundation treatment technology field.
(2) background technology
In recent years, along with coastal area economy, fast development of society, the construction land imbalance between supply and demand becomes increasingly conspicuous, develop to the sea, the abundant beach resource in development and use coastal area, become these areas and solve land resources main path in short supply, enclosing extra large reclamation by pumping filling is the main mode of coastal from now on beach area land development.The barged-in fill of coastal area is mud and muddy soft soil substantially, the characteristics that have that water content height, poor permeability, intensity are low, personnel and machinery can't be marched into the arena directly.Conventional treatment of soft foundation worker method can't be implemented, and has brought new difficulty for the development ﹠ construction of coastal area.
Before the present invention, the conventional place of reclaiming fields from the sea, after hydraulic reclamation was finished, the place needed nature fixed 2～5 years, after surface layer on the scene again takes to spread technical measures such as mao bamboon, plastic woven cloth, layer of sand, can go up people and light-duty machinery equipment and carry out the ground processing.But this is in short supply with the various places construction land, and the requirement of being badly in need of land used behind hydraulic reclamation contradicts.
(3) summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, provide a kind of after hydraulic reclamation is finished, can follow up rapidly and handle the fast consolidation method of blow-filled soft soil for land reclamation of weak soil.
The object of the present invention is achieved like this: a kind of fast consolidation method of blow-filled soft soil for land reclamation, and described method comprises following processing step:
Step 1, set up pontoon bridge
On the saturated dredger soft soil that need are handled, set up pontoon bridge, construct operation platform and passage on the mud, pontoon bridge has many, every pontoon bridge is made up of column, crosspiece, railing, pontoon bridge plate and panel, column has some, some root posts are divided into two rows and vertically insert the saturated dredger soft soil that needs processing, and at 4～5m, the column upper end is exposed the saturated dredger soft soil surface and is not less than 0.9m with the spacing between adjacent two root posts of row; Described crosspiece and railing all have two, and crosspiece is fixedly connected on the inboard of the column of saturated dredger soft soil top, and railing is fixedly connected on the inboard, upper end of column; Described pontoon bridge plate and panel have polylith, and pontoon bridge plate fixed mount is located between the crosspiece of two row's column inboards, and panel is laid on the pontoon bridge plate, and the width of monolithic pontoon bridge plate is at 1.0～1.5m, and thickness is not less than 10cm, and area is not less than 2m
2, reserve pull rope for four jiaos on the pontoon bridge plate,
Completely spread plastic woven cloth on the saturated dredger soft soil surface, at plastic woven cloth upper berth pontoon bridge plate, the plastic woven cloth that the constructor stands on the pontoon bridge plate rolling opens forward, and mobile subsequently pontoon bridge plate opens plastic woven cloth forward again,
The constructor is responsible for and arm on pontoon bridge plate upper berth, and the person in charge's cloth tube pitch is at 10～15m, and the every person in charge goes up and reserves the interface that is no less than a vacuum pump; The cloth tube pitch of arm connects and is responsible for and arm at 0.8～2m,
The constructor beats plastic draining board from vertical the inserting in hydraulic reclamation weak soil surface on the pontoon bridge plate, plastic draining board adopts the quincunx alternate layout of little spacing length plate, the spacing of plastic draining board is at 0.5～1.0m, the saturated dredger soft soil surface is exposed in the plastic draining board upper end, oblique loose raising around being connected adopted with arm in the plastic draining board upper end, long plastic draining board length is greater than saturated dredger soft soil thickness, and short plastic draining board length is at 1-2.0m
In the shop, plastic woven cloth surface of the joint of burying vacuum pump underground and vacuum meter, pore pressure cell monitoring equipment geotextiles,
In shop, geotextiles surface vacuum diaphragm, vacuum diaphragm thickness is not less than 0.14mm, adopts duplicature, and the vacuum diaphragm edge is pressed into the sealing ditch around the saturated dredger soft soil,
The branch level Four tries to be drawn into capable vacuum load step by step, and primary load takes each pump impeller stream to load.Primary load pump quantity opens 20%, and examination is found time and is controlled at 7-9 days; Second level load pump is opened quantity 40%, examination is found time and is controlled at 5-7 days, third level load pump quantity opens 60%, examination is taken out and is controlled at time 3-5 days, fourth stage load pump quantity is opened more than 80%, and examination is taken out and is controlled at time 1-3 days, all loads to try to exhaust to become to be no less than 20 days, simultaneously monitor under the film step by step, vacuum on the pump, check the sealing effectiveness of vacuum system and the operation conditions of equipment.Vacuum must increase and improve gradually along with loading progression under the film.The vacuum of vacuum pump must be more than 96kpa when examination was taken out and loaded, and loaded to finish that vacuum must reach more than the 80kpa under the film.
When hierarchical loading examination exhausts, vacuum is greater than 80kpa under the film, and vacuum pump is opened quantity and reached design more than 90%, and the place enters formal vacuumizing phase.
Construction whole process is carried out vacuum, saturated dredger soft soil mesopore water pressure and the monitoring of surface settlement aspect, place in vacuum, the plastic draining board under vacuum, the film on the pump,
After vacuum pressure reaches more than the 80kPa under film, continue voltage regulation operation 7 days, beginning is provided with water-retaining cofferdam and the saturated dredger soft soil overlying water in the cofferdam at the sealing limes marginis, the cofferdam adopts the earth bag height at 0.3m ± 0.1m, the earth bag upstream face need be spread waterproof plastic sheeting, cover water depth at 0.3～0.5m, carry out vacuum and cover the compound precompressed of water
Draw sedimentation-time curve and hole pressure-time graph, when sedimentation-time graph and hole pressure-time graph tend towards stability, place sedimentation in continuous 4 days is less than 2mm, and total pumpdown time is not less than 90 days, can unload detection, the bearing capacity in place is greater than 50kpa after the consolidation process.
The invention has the beneficial effects as follows:
1, the present invention adopts the technology of pontoon bridge auxiliary construction on the mud, has realized people's construction on the saturated dredger soft soil of zero bearing capacity.
The constructor spreads plastic woven cloth, inserts operations such as plastic draining board, stringing, shop geotextiles on pontoon bridge.Overcome the technical barrier that traditional soft foundation processing technology can not follow up at once and handle on new saturated dredger soft soil, saving new saturated dredger soft soil needs time of handling again behind the fixed 2-5 of nature.
2, the present invention adopts vacuum tube with the direct link technique of plastic draining board, has cancelled the sand cushion of traditional vacuum precompressed technology, has reduced the loss that vacuum pressure transmits in sand cushion, has reduced the difficulty of construction of sanding on the mud.Compare with traditional technique of soft soil foundation treatment, simplified construction technology, reduced cost, slow down the rate of decay of vacuum in the plastic draining board of knowing clearly, improved the place consolidation effect.
3, the present invention adopts length to harden to close little spacing cloth plate technique and vacuum fractionation loading technique, overcome the place and handled inhomogeneous technical barrier.
The present invention is according to blast-filled ground soil, along cohesion features of smaller between bigger characteristics of the fixed naturally otherness of depth direction and the place soil, adds short slab in the middle of adopting long slab, with plastic draining board hypotelorism in the shallow-layer fine grained silt soil; Technical measures such as vacuum fractionation Loading Control vacuum load speed have been proposed simultaneously; Eliminate the little earth pillar phenomenon of plastics row edges of boards, improved the uniformity that handle in the place.
4, the present invention adopts plastic draining board and the oblique loose technology that curls up of arm, and adopts double-deck filter film technology, has overcome technical barriers such as plastic draining wrench and the obstruction of arm connecting portion mud.
5, the present invention behind the vacustat, adopts water covering prepressing and vacuum preloading to combine under film, has improved vacuum under prefabricating load and the film, has avoided vacuum diaphragm to be directly exposed under the sun, has delayed its aging speed.
(4) description of drawings
Fig. 1 is a fast consolidation method of blow-filled soft soil for land reclamation perspective view of the present invention.
Fig. 2 is a pontoon structure elevational schematic view of the present invention.
Fig. 3 is a pontoon structure floor map of the present invention.
Reference numeral among the figure:
Long plastic draining board 1, short plastic draining board 2, horizontal plastic draining board 3, arm 4, the person in charge 5, plastic woven cloth 6, geotextiles 7, vacuum diaphragm 8, vacuum pump 9, crosspiece (level) 10, column 11, pontoon bridge plate 12, panel 13, railing 14.
(5) specific embodiment
Referring to Fig. 1～3, Fig. 1 is a fast consolidation method of blow-filled soft soil for land reclamation perspective view of the present invention.Fig. 2 is a pontoon structure elevational schematic view of the present invention.Fig. 3 is a pontoon structure floor map of the present invention.By Fig. 1, Fig. 2 and Fig. 3 as can be seen, fast consolidation method of blow-filled soft soil for land reclamation of the present invention, described method comprises following processing step:
Step 1, pontoon bridge are set up
1) according to processing region shape, size and topography and geomorphology, divide the construction blocks of cells, planning construction pontoon bridge passage is measured setting-out, and the unit construction block area of general saturated dredger soft soil is at 1～20,000 m
2
2) set up pontoon bridge
On the saturated dredger soft soil that need are handled, set up pontoon bridge, construct operation platform and passage on the mud, pontoon bridge has many, every pontoon bridge is made up of column, crosspiece, railing, pontoon bridge plate and panel, column has some, some root posts are divided into two rows and vertically insert the saturated dredger soft soil that needs processing, and at 4～5m, the column upper end is exposed the saturated dredger soft soil surface and is not less than 0.9m with the spacing between adjacent two root posts of row; Described crosspiece and railing all have two, and crosspiece is fixedly connected on the inboard of the column of saturated dredger soft soil top, and railing is fixedly connected on the inboard, upper end of column; Described pontoon bridge plate and panel also have polylith, and pontoon bridge plate fixed mount is located between the crosspiece of two row's column inboards, and panel is laid on the pontoon bridge plate.The width of monolithic pontoon bridge plate is at 1.0～1.5m, and thickness is not less than 10cm, and area is not less than 2m
2Reserve pull rope for four jiaos on the pontoon bridge plate, conveniently to move flexibly and to be connected on the scenely.After pontoon bridge sets up and finishes, must can use after sample bearing capacity detection and total length walking detection are qualified, the requirement for bearing capacity of pontoon bridge is greater than 0.6kpa.
Plastic woven cloth is completely spread on the saturated dredger soft soil surface.The plastic woven cloth fabric width is 3.8M, adopts on-the-spot splicing, and its specification is at 160g/m
2-200g/m
2At plastic woven cloth upper berth come-up bridge plate, the plastic woven cloth that the constructor stands on the pontoon bridge plate rolling opens forward, and mobile subsequently pontoon bridge plate opens plastic woven cloth forward again.
The constructor is responsible for and arm on pontoon bridge plate upper berth, and the person in charge's cloth tube pitch is controlled at 10～15m, and the every person in charge goes up and reserves the interface that is no less than 1 vacuum pump; The cloth tube pitch of arm is controlled at 0.8～2m, connects to be responsible for and arm.The person in charge and arm generally adopt the ripple chimney filter of HDPE or PPR, and caliber is at φ 53-60mm, and ring stiffness is more than 15kpa.Be responsible for domestic demand and add the anti-flat interior support of inhaling.
The constructor beats plastic draining board from vertical the inserting in hydraulic reclamation weak soil surface on the pontoon bridge plate, plastic draining board adopts the alternate quincuncial arrangement that is of little spacing length plate, the saturated dredger soft soil surface is exposed in the plastic draining board upper end, oblique loose raising around being connected adopted with arm in the plastic draining board upper end, the spacing of plastic draining board is at 0.5～1.0m, long plastic draining board length is greater than saturated dredger soft soil thickness, and short plastic draining board length is at 1-2.0m.
The pre-buried membrane union of interface of vacuum pump on being responsible for is buried the probe of pore pressure cell and vacuum meter underground according to designing requirement.
In the shop, plastic woven cloth surface of the joint of burying vacuum pump underground and vacuum meter, pore pressure cell monitoring equipment geotextiles, geotextiles is chopped fiber needle-punched worker's handwoven cloth, and regular size is at 150g/m
2～250/m
2
In shop, geotextiles surface vacuum diaphragm, vacuum diaphragm thickness is not less than 0.14mm, generally adopts duplicature.The vacuum diaphragm edge is pressed into the sealing ditch around the saturated dredger soft soil.
The branch level Four tries to be drawn into capable vacuum load step by step, and primary load takes each pump impeller stream to load.Primary load pump quantity opens 20%, and examination is found time and is controlled at 7-9 days; Second level load pump is opened quantity 40%, examination is found time and is controlled at 5-7 days, third level load pump quantity opens 60%, examination is taken out and is controlled at time 3-5 days, fourth stage load pump quantity is opened more than 80%, and examination is taken out and is controlled at time 1-3 days, all loads to try to exhaust to become to be no less than 20 days, simultaneously monitor under the film step by step, vacuum on the pump, check the sealing effectiveness of vacuum system and the operation conditions of equipment.Vacuum must increase and improve gradually along with loading progression under the film.The vacuum of vacuum pump must be more than 96kpa when examination was taken out and loaded, and loaded to finish that vacuum must reach more than the 80kpa under the film.
When hierarchical loading examination exhausts, vacuum is greater than 80kpa under the film, and vacuum pump is opened quantity and reached design more than 90%, and the place enters formal vacuumizing phase.
Construction whole process is carried out aspect monitorings such as vacuum, saturated dredger soft soil mesopore pressure, place surface settlement in vacuum, the plastic draining board under vacuum, the film on the pump.
After vacuum pressure reaches more than the 80kPa under film, continue voltage regulation operation 7 days, beginning is provided with water-retaining cofferdam and the saturated dredger soft soil overlying water in the cofferdam at the sealing limes marginis, the cofferdam adopts the earth bag height at 0.3m ± 0.1m, the earth bag upstream face need be spread waterproof plastic sheeting, cover water depth at 0.3～0.5m, carry out vacuum and cover the compound precompressed of water.
Draw sedimentation-time curve and hole pressure-time graph, when sedimentation-time graph and hole pressure-time graph tend towards stability, place sedimentation in continuous 4 days is less than 2mm, and total pumpdown time be not less than 90 days, can unload detection.The bearing capacity in place is greater than 50kpa after the consolidation process.
Claims (1)
1. fast consolidation method of blow-filled soft soil for land reclamation is characterized in that described method comprises following processing step:
Step 1, set up pontoon bridge
On the saturated dredger soft soil that need are handled, set up pontoon bridge, construct operation platform and passage on the mud, pontoon bridge has many, every pontoon bridge is made up of column, crosspiece, railing, pontoon bridge plate and panel, column has some, some root posts are divided into two rows and vertically insert the saturated dredger soft soil that needs processing, and at 4～5m, the column upper end is exposed the saturated dredger soft soil surface and is not less than 0.9m with the spacing between adjacent two root posts of row; Described crosspiece and railing all have two, and crosspiece is fixedly connected on the inboard of the column of saturated dredger soft soil top, and railing is fixedly connected on the inboard, upper end of column; Described pontoon bridge plate and panel have polylith, and pontoon bridge plate fixed mount is located between the crosspiece of two row's column inboards, and panel is laid on the pontoon bridge plate, and the width of monolithic pontoon bridge plate is at 1.0～1.5m, and thickness is not less than 10cm, and area is not less than 2m
2, reserve pull rope for four jiaos on the pontoon bridge plate,
Step 2, shop plastic woven cloth
Completely spread plastic woven cloth on the saturated dredger soft soil surface, at plastic woven cloth upper berth pontoon bridge plate, the plastic woven cloth that the constructor stands on the pontoon bridge plate rolling opens forward, and mobile subsequently pontoon bridge plate opens plastic woven cloth forward again,
Step 3, shop are responsible for and arm
The constructor is responsible for and arm on pontoon bridge plate upper berth, and the person in charge's cloth tube pitch is at 10～15m, and the every person in charge goes up and reserves the interface that is no less than a vacuum pump; The cloth tube pitch of arm connects and is responsible for and arm at 0.8～2m,
Step 4, the slotting plastic draining board of beating
The constructor beats plastic draining board from vertical the inserting in hydraulic reclamation weak soil surface on the pontoon bridge plate, plastic draining board adopts the quincunx alternate layout of little spacing length plate, the spacing of plastic draining board is at 0.5～1.0m, the saturated dredger soft soil surface is exposed in the plastic draining board upper end, oblique loose raising around being connected adopted with arm in the plastic draining board upper end, long plastic draining board length is greater than saturated dredger soft soil thickness, and short plastic draining board length is at 1-2.0m
Step 5, the joint of burying vacuum pump underground, vacuum meter, pore pressure cell monitoring equipment,
Step 6, shop geotextiles
In the shop, plastic woven cloth surface of the joint of burying vacuum pump underground and vacuum meter, pore pressure cell monitoring equipment geotextiles,
Step 7, shop vacuum diaphragm
In shop, geotextiles surface vacuum diaphragm, vacuum diaphragm thickness is not less than 0.14mm, adopts duplicature, and the vacuum diaphragm edge is pressed into the sealing ditch around the saturated dredger soft soil,
Step 8, cloth vacuum pump, examination are taken out
The branch level Four tries to be drawn into capable vacuum load step by step, and primary load takes each pump impeller stream to load, and primary load pump quantity opens 20%, and examination is found time and is controlled at 7-9 days; Second level load pump is opened quantity 40%, examination is found time and is controlled at 5-7 days, third level load pump quantity opens 60%, examination is taken out and is controlled at time 3-5 days, fourth stage load pump quantity is opened more than 80%, examination is taken out and is controlled at time 1-3 days, all load and try to exhaust to become to be no less than 20 days, simultaneously monitor under the film step by step, vacuum on the pump, check the sealing effectiveness of vacuum system and the operation conditions of equipment, vacuum increases and improves gradually along with loading progression under the film, and examination is taken out the vacuum of vacuum pump when loading more than 96kpa, loading finishes that vacuum reaches more than the 80kpa under the film
Step 9, vacuumize
When hierarchical loading examination exhausts, vacuum is greater than 80kpa under the film, and vacuum pump is opened quantity and reached design more than 90%, and the place enters formal vacuumizing phase,
Step 10, construction monitoring
Construction whole process is carried out vacuum, saturated dredger soft soil mesopore water pressure and the monitoring of surface settlement aspect, place in vacuum, the plastic draining board under vacuum, the film on the pump,
Step 11, vacuum are covered the water joint preloading
After vacuum pressure reaches more than the 80kPa under film, continue voltage regulation operation 7 days, beginning is provided with water-retaining cofferdam and the saturated dredger soft soil overlying water in the cofferdam at the sealing limes marginis, the cofferdam adopts the earth bag height at 0.3m ± 0.1m, the earth bag upstream face need be spread waterproof plastic sheeting, cover water depth at 0.3～0.5m, carry out vacuum and cover the compound precompressed of water
Step 12, unloading detect
Draw sedimentation-time curve and hole pressure-time graph, when sedimentation-time graph and hole pressure-time graph tend towards stability, place sedimentation in continuous 4 days is less than 2mm, and total pumpdown time is not less than 90 days, unloading detects, and the bearing capacity in place is greater than 50kpa after the consolidation process.
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