CN103031836B - A kind of method of building road on new hydraulically filled sludge ground fast - Google Patents

A kind of method of building road on new hydraulically filled sludge ground fast Download PDF

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Publication number
CN103031836B
CN103031836B CN201310005718.5A CN201310005718A CN103031836B CN 103031836 B CN103031836 B CN 103031836B CN 201310005718 A CN201310005718 A CN 201310005718A CN 103031836 B CN103031836 B CN 103031836B
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draining
pumping
water
ground
sand
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CN103031836A (en
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董志良
陈平山
罗彦
李燕
周红星
鲍树峰
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CCCC Fourth Harbor Engineering Co Ltd
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CCCC FOURTH HARBOR GEOTECHNICAL ENGINEERING Co Ltd
GUANGZHOU SIHANG MATERIAL TECHNOLOGY Co Ltd
CCCC Fourth Harbor Engineering Co Ltd
CCCC Fourth Harbor Engineering Institute Co Ltd
Guangzhou Harbor Engineering Quality Inspection Co Ltd
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Abstract

The invention discloses a kind of method of building road on new hydraulically filled sludge ground fast, construct as follows successively: (1) arranges work layer; (2) in work layer, sand cushion is laid; (3) vertical drainage body is set; (4) horizontal drainage passage is set in sand cushion, and with water-pumping/draining equipment connection; (5) treating that the preloading of reinforcing area internal classification is constructed; (6) construction machinery walks in and waits that reinforcing region surface applies dynamic load, carries out precompressed using preloading as dead load, starts the draining of water-pumping/draining equipment simultaneously, implements to reinforce to ground; (7), after precompressed, water-pumping/draining equipment is removed, shutoff horizontal drainage passage.The invention solves the technical barrier cannot building interim or permanent roads at present on new hydraulically filled sludge place fast, utilize the walking load of construction machinery, combined heap load precompacting and water-pumping/draining, a large amount of water bodys in quick discharge ground, and the head reduced in drainage blanket, keep the patency of draining, to reach reinforcing object.

Description

A kind of method of building road on new hydraulically filled sludge ground fast
Technical field
The present invention relates to the foundation treatment technology field of the fixed buildings such as port works, construction work, highway engineering, be specifically related to the engineering that the super soft grounds such as reclaiming land around sea, man-made island and highway filled-up ground are reinforced.
Background technology
Along with the fast development of China's economy, reclaiming land around sea has become the main path solving major port and facing-port industry construction land.Because of sand and stone resources in short supply and involve great expense, environmental disruption is serious, meanwhile, China's annual harbor approach dredging earth volume reaches more than several hundred million cubes, and therefore, in conjunction with the engineering of desilting and dredging at navigation channel or Haikou, dredging markets is the main hydraulic reclamation material of current reclaiming land around sea.Because hydraulic reclamation dredging markets mostly is super soft weak soil, moisture content high (being greater than 150%), permeability is low, and hydraulic reclamation dredging markets place cannot directly use, and can become construction land after having to pass through reinforcing.
All kinds of engineering activity is carried out in new hydraulically filled sludge place, road is required, especially in recent years coastal various places have more now this trend: by the epeirogenetic of Government-Leading Perioperative cardiac events, and carry out infrastructure construction, again soil is sold the enterprise of demand, carry out basement process by enterprise according to the application target of self.So, often need on new hydraulically filled sludge place, build temporary construction sidewalk or as permanent town road, to meet engineering construction demand.But because blowing-filling sludge place bearing capacity is extremely low, the crust layer that possesses certain bearing capacity must be formed on ground top layer, can follow-up construction be carried out.What extensively adopt in recent years is shallow top layer rapid reinforcement technology, although the method duration short reinforcement depth is limited, often needs to carry out deep-layer reinforcing again to ground, cost is increased.And the preloading duration is longer, but the crust layer thickness formed is large.Consider temporary construction sidewalk or permanent town road not high for the requirement of bearing capacity, therefore, by controlling prefabricating load and time, in conjunction with work progress middle rolling car load, certain thickness crust layer can be formed to meet the instructions for use of road.But, existing piling prepressing engineering practice shows, because super soft ground moisture content is high, deformation of base compress is large, sand cushion as drainage blanket sinks with foundation settlement, form peviform, the water body accumulated in sand cushion cannot drain into outside stabilization zone, head in sand cushion is caused sharply to raise, originally the sand cushion as permeable boundary develops into " non-pervious layer " or " aquitard " gradually, seriously undermine the water permeable ability of sand cushion, thus reduce the consolidation effect of piling prepressing, simultaneously, by the impact of head in sand cushion, impeded drainage, the rate of settling reduces, the degree of consolidation calculated by field measurement subsidence curve is greater than the actual degree of consolidation, cause unloading in advance, considerably increase settlement after construction.
Therefore, for the mud place of new hydraulic reclamation, propose a kind of quick, economical and the road performance technology that significantly can reduce settlement amount after construction just seems very necessary.
Summary of the invention
Object of the present invention is intended to solve the technical barrier building road in new hydraulically filled sludge place fast, for blowing-filling sludge high-moisture percentage feature, on conventional surcharge preloading Loading method basis, in conjunction with dynamic load mechanical in work progress, and in drainage blanket, set up water-pumping/draining system, the road possessed compared with high-bearing capacity can be built fast, and greatly reduce settlement after construction, reduce construction costs, for building temporary construction sidewalk fast at super soft weak soil ground or permanent road provides a kind of new technology.
A kind of method of building road on new hydraulically filled sludge ground fast of the present invention, construct as follows successively:
(1) treating that muck surface in reinforcing area arranges the work layer possessing bearing capacity;
(2) walk in work layer surface with construction machinery, work layer lays sand cushion;
(3) vertical drainage body is set;
(4) horizontal drainage passage is set in sand cushion, and with water-pumping/draining equipment connection;
(5) according to site elevation, treating that the preloading of reinforcing area internal classification is constructed;
(6) construction machinery walks in and waits that reinforcing region surface applies dynamic load, carries out precompressed using preloading as dead load, starts the draining of water-pumping/draining equipment simultaneously, implements to reinforce to ground;
(7), after precompressed, water-pumping/draining equipment is removed, shutoff horizontal drainage passage.
The work layer of described step (1) is made up of one or more of the materials such as bamboo frame, chaste tree fragrant plant, geo-grid, geotextiles.
The sand cushion of described step (2) by Extra-fine sand, medium coarse sand or both jointly form.
The vertical drainage body of described step (3) selects one or more in plastic draining board, sand wick or flexible porous tube.
The horizontal drainage passage of described step (4) selects one or more in PVC chimney filter, flexible porous tube, plastic draining board, plastics, rubble french drain and sand drain, outsourcing non-woven geotextile, and in crisscross netted layout, be connected to pumping equipment by pipeline, form water-pumping/draining system.
The heap material containing of described step (5) be selected from sand, soil, cut into a mountain in stone one or more, select the preloading construction method of throwing method or hydraulic reclamation method or land propelling backfill method.
When described step (6) foundation settlement speed is greater than 2.0cm/d, water-pumping/draining equipment needs continuous operation, when the rate of settling is less than 2.0cm/d, the interval with 2 ~ 3 days) intermittently open water-pumping/draining equipment and carry out draining, till reaching the design degree of consolidation.
Exposed horizontal drainage passage is imbedded in ground after removing water-pumping/draining equipment by described step (7), or when building road surface structare layer, the drainage channel materials such as native stone or concrete is carried out shutoff.
The invention solves on new hydraulically filled sludge place, still cannot build technical barrier that is interim or permanent roads at present fast, utilize the walking load of construction machinery, combined heap load precompacting and water-pumping/draining, a large amount of water bodys in quick discharge ground, and the head reduced in drainage blanket, keep the patency of draining, to reach reinforcing object.The method can form temporary construction sidewalk fast on new hydraulically filled sludge place, or for building permanent road, and greatly reduce settlement amount after construction, fill out dredging silt formation land-based area for large top blast and carry out infrastructure construction and provide convenience, and operation and equipment comparatively simple, cheap, the duration is short, is suitable for applying.
Compared with prior art, tool has the following advantages in the present invention:
1, compare with ultra-soft soil superficial rapid reinforcement technology, the crust layer thickness that the present invention is formed because of preloading can reach more than 1.0m, bearing capacity of foundation soil can higher than 80kPa, and can according to the instructions for use adjustment preloading size of road and squeeze time, general train-passing through conditions can be met in a short time, cheap.
2, compare with conventional surcharge preloading Loading method, the present invention is provided with water-pumping/draining system in sand cushion, the water body of sand cushion inner accumulated can be drained in time, make sand cushion remain complete Brainage boundary, shorten squeeze time, significantly improve consolidation effect, meanwhile, after reinforcing, drainage channel is by shutoff, and the pore water in the soil body cannot be got rid of, roadbed will be difficult to distortion, and thus settlement after construction can significantly reduce.
3, compare with vacuum method, the present invention utilizes sand cushion to conduct oneself with dignity, piles material containing deadweight and construction machinery walking load, forms the consolidation pressure in blowing-filling sludge place, in work progress, mud starts consolidation, without the need to sealing system, later maintenance is relatively simpler, can save electric energy significantly.
Accompanying drawing explanation
Fig. 1 is a kind of technology generalized section of building road on new hydraulically filled sludge place fast.
Fig. 2 is horizontal drainage pipeline plane of arrangement schematic diagram in sand cushion.
Wherein, 1-blowing-filling sludge, 2-original state weak soil, 3-working lining, 4-sand cushion, 5-vertical drainage body, 6-horizontal drainage pipeline, 7-piles carrier, 8-water-pumping/draining equipment, 9-linker.
Specific implementation method
The present invention implements according to the following steps:
(1) build cofferdam, and on original state weak soil 2 blowing-filling sludge 1.
(2) working lining 3 is set on blowing-filling sludge 1, first lays one deck woven cloth, re-lay one deck geo-grid; Or lay one deck woven cloth, lay bamboo frame or chaste tree fragrant plant thereon, re-lay one deck woven cloth, thus form the working lining 3 possessing certain bearing capacity.
(3) on working lining 3, lay sand cushion 4, sand cushion thickness is by related specifications requirement.
(4) on sand cushion 4, vertical drainage body 5 is plugged.Vertical drainage body at regular intervals (0.8 ~ 1.0m) is arranged, forms square or triangle at the line of plane.
(5) longitudinal direction and transverse horizontal discharge pipe line 6 are set on sand cushion, imbed 20 ~ 25cm in sand cushion, cover with sand, leveling place.Horizontal drainage passage must wrap up with non-woven geotextile, and be laterally arranged in parallel by spacing 10m ~ 15m, longitudinal and transverse line connection threeway or four connectors connect, and form crisscross planar network.
(6) horizontal drainage passage is connected with outside pumping equipment 8 by water suction hose.
(7) construction machinery walks in and waits that reinforcing region surface applies dynamic load, carries out classification and lays heap carrier 7 and control preloading speed, open water-pumping/draining equipment 8 simultaneously, get rid of the water body accumulated in sand cushion in time on sand cushion surface.
(8), after preloading construction, intermittently open water-pumping/draining equipment 8, avoid occurring ponding in sand cushion, until piling prepressing terminates.
(9) after precompressed, remove water-pumping/draining equipment 8, exposed horizontal drainage pipeline 6 is imbedded in ground, or when building road surface structare layer, the drainage channel materials such as native stone or concrete are carried out shutoff.

Claims (6)

1. on new hydraulically filled sludge ground, build a method for road fast, it is characterized in that constructing as follows successively:
(1) treating that muck surface in reinforcing area arranges the work layer possessing bearing capacity;
(2) walk in work layer surface with construction machinery, work layer lays sand cushion;
(3) vertical drainage body is set;
(4) horizontal drainage passage is set in sand cushion, and with water-pumping/draining equipment connection;
(5) according to site elevation, treating that the preloading of reinforcing area internal classification is constructed;
(6) construction machinery walks in and waits that reinforcing region surface applies dynamic load, carries out precompressed using preloading as dead load, start the draining of water-pumping/draining equipment simultaneously, implement to reinforce to ground, when the ground rate of settling is greater than 2.0cm/d, water-pumping/draining equipment needs continuous operation, when the rate of settling is less than 2.0cm/d, opens water-pumping/draining equipment with the interval of 2 ~ 3 days and carry out draining, till ground reaches the design degree of consolidation;
(7) after precompressed, remove water-pumping/draining equipment, after removing water-pumping/draining equipment, exposed horizontal drainage passage is imbedded in ground, or when building road surface structare layer, horizontal drainage passage native stone or concrete material are carried out shutoff.
2. the method for building fast road on new hydraulically filled sludge ground according to claims 1, it is characterized in that the work layer of described step (1) by bamboo frame, chaste tree fragrant plant, geo-grid, geotextile material one or more form.
3. the method for building fast road on new hydraulically filled sludge ground according to claims 1, it is characterized in that the sand cushion of described step (2) by Extra-fine sand, medium coarse sand or both jointly form.
4. the method for building fast road on new hydraulically filled sludge ground according to claims 1, is characterized in that one or more that the vertical drainage body of described step (3) selects in plastic draining board, sand wick or flexible porous tube.
5. the method for building road on new hydraulically filled sludge ground fast according to claims 1, it is characterized in that one or more that the horizontal drainage passage of described step (4) selects in PVC chimney filter, flexible porous tube, plastic draining board, plastics, rubble french drain and sand drain, outsourcing non-woven geotextile, and in crisscross netted layout, be connected to pumping equipment by pipeline, form water-pumping/draining system.
6. the method for building road on new hydraulically filled sludge ground fast according to claims 1, it is characterized in that the heap material containing of described step (5) be selected from sand, soil, cut into a mountain in stone one or more, select the preloading construction method of throwing method or hydraulic reclamation method or land propelling backfill method.
CN201310005718.5A 2013-01-08 2013-01-08 A kind of method of building road on new hydraulically filled sludge ground fast Active CN103031836B (en)

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CN103726486A (en) * 2013-12-16 2014-04-16 邓立新 Processing method for strengthening vacuum preloading soft foundation by direct-current electric field
CN105019420A (en) * 2014-04-29 2015-11-04 中交四航工程研究院有限公司 One-time deep treatment method of new reclamation supersoft soil foundation
CN105178125B (en) * 2015-10-15 2018-04-17 中交第一公路工程局有限公司 A kind of lake region High-filled emkankment is blown sand embankments construction method and embankment structure
CN105421332A (en) * 2015-12-01 2016-03-23 宁波滨海新城建设投资有限公司 Soft foundation superficial layer novel treating method for accelerating natural consolidation of soft soil
CN106884423A (en) * 2015-12-16 2017-06-23 中国二十冶集团有限公司 Mud area method for processing foundation
CN105804046A (en) * 2016-04-06 2016-07-27 化学工业岩土工程有限公司 Processing method for soft clay foundation
CN106400776B (en) * 2016-11-09 2019-01-04 浙江水利水电学院 Lowland barged-in fill drainage system and bottom vacuumize preloading method
CN106702845B (en) * 2016-11-16 2019-01-29 青岛大学 One kind preventing saline and alkaline permeable pavement structure
CN108265697A (en) * 2016-12-30 2018-07-10 北京市第五建筑工程集团有限公司 Vacuum prepressing ground foundation treatment method
CN107059523A (en) * 2017-06-20 2017-08-18 天津大学 A kind of construction method that road is built on reclaimed ground and the subgrade strengthening structure of construction method formation
CN108867610A (en) * 2018-07-24 2018-11-23 四川大航建设工程有限公司 A kind of construction method of the laying road on mud earthen foundation
CN111321742A (en) * 2020-03-08 2020-06-23 华中科技大学 Integrated treatment and filling device and method for sludge with high water content
CN113152499A (en) * 2021-03-19 2021-07-23 国网河北省电力有限公司邢台供电分公司 Cofferdam backfill reinforced foundation and construction method
CN113250266A (en) * 2021-06-18 2021-08-13 中铁四局集团有限公司 Dry-type dredging method for river channel

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