CN1818222A

CN1818222A - Cosolidation with sludge dredging and water draining

Info

Publication number: CN1818222A
Application number: CN 200610038968
Authority: CN
Inventors: 洪振舜; 邓永锋; 沈水龙
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2006-03-21
Filing date: 2006-03-21
Publication date: 2006-08-16

Abstract

This is a quick damming method suitable for yielding soil treatment composed by several layers of sullage and sand. At building, a layer of sullage is dumped then a layer of sand. Sand will sink into sullage by gravity to increase sullage penetrability. The procedure is repeated till reach the designed height. Put loading, like water bag, to the dam top to move out water and solidify.

Description

Cosolidation with sludge dredging and water draining

Technical field

The present invention is a kind of sullage solidifying method, is applicable to treatment of soft foundation, belongs to technical field of civil engineering.

Background technology

Along with China's rapid economic development, building projects such as port works, waterway engineering, hydraulic engineering increase sharply, in the dredging process in various navigation channels with the harbour is newly-built, in the extension project, can produce a large amount of dredging earth usually.According to incompletely statistics, the annual discarded dredging silt of China reaches 10,000 ten thousand m ³More than, the engineering quantity that dredging silt is handled is very considerable.At present often the process for treating sludge that adopts has two kinds, the one, mud is thrown into marine, the 2nd, dash in cofferdam, offshore place and to fill out epeirogenetic.

Cofferdam, offshore place dashes the method for filling out the epeirogenetic employing: at first adopt method shape cofferdam such as jackstone at offshore, to wherein reaching design height towards filling out mud, dash fill out mud and finish after, lay sand cushion at the mud end face, sand cushion both can be used as the horizontal drainage layer, and the while is as the working platform that sets machinery-band drain board-plugging device of plastic draining board.Set plastic draining board then, improve the engineering properties of mud through long-term discharging consolidation.

Dash the often following problem of appearance of epeirogenetic of filling out in cofferdam, offshore place:

(1) mud leaks in a large number, serious backflow phenomenon towards filling out;

(2) because the engineering properties of mud is very poor, shear strength is low, be subjected to characteristics such as decrement is big behind the load action, therefore need to spend a large amount of expenses after filling out ground is carried out after-treatment dashing, lay sand cushion, set method such as plastic draining board then and handle as common employing mud top layer;

(3) transmission coefficient of mud is very low, dashes that to fill out silt consolidation chronic, needed usually several years in addition the longer time fixed.

Summary of the invention

Technical problem: the cofferdam, offshore place that the present invention is directed to mud dashes fills out the problems referred to above that exist in the epeirogenetic, proposes Cosolidation with sludge dredging and water draining and handles dredging silt.This invention can be turned waste into wealth on the one hand by the discharging consolidation to dredging silt, and the protection environment on the other hand, can save the after-treatment of mud, increases the Penetration Signature of mud, quickens the fixed of mud, reduces the duration.

Technical scheme: for this reason, the invention provides a kind of easy construction, simple to operate, fast and effectively mud discharging consolidation method of operating.Dash the deficiency of filling out in the epeirogenetic at offshore place cofferdam mud, propose to adopt dredging silt discharging consolidation worker method to handle dredging silt.Its concrete grammar is: mud dashes to fill out and is not to adopt a hydraulic reclamation to design height, but the layering hydraulic reclamation, and every hydraulic reclamation one deck, lay certain thickness sand cushion thereon, utilize the deadweight of sand grains to sink in the mud, form sand mud mixture, thereby obviously improve the Penetration Signature of mud.And then hydraulic reclamation second layer mud and sand cushion ..., up to design altitude.Finish after the hydraulic reclamation of mud, lay load (as water bag) at the mud end face.Because the coastal seawater abundance, it is with low cost that therefore the water bag loading is set, and it is simple and convenient to construct.Under the deadweight effect of load (as water bag) and mud, the mud discharging consolidation.

Concrete constructing operation step is as follows:

1). adopt the method for jackstone to form the cofferdam at offshore;

2). filling one deck mud in the cofferdam, silt depth 1～2m fills out one deck layer of sand at the mud end face then, and layer of sand is lowered in the mud in the deadweight effect, forms the silt particle mixture,

3). repeating step 2), until design altitude;

4). finish after the filling of mud, load at the mud end face, the load size is determined according to the discharging consolidation construction period;

5). the silt particle mixture is under its deadweight effect and load action thereof, and is rapidly solidified, finishes the cofferdam filling and makes ground.

The mud of filling adopts strand suction formula hydraulic suction dredge with the marine mud sucking-off in the cofferdam, then adopts the method for transportation by lighter or line transportation mud to be sent to the zone that needs hydraulic reclamation.The method that loads at the mud end face is with sand or water bag preloading.

Beneficial effect: this method easy construction, simple to operate.Its advantage mainly contains:

(1) by discharging consolidation to dredging silt, can turn waste into wealth on the one hand, the protection environment satisfies the requirement of sustainable development;

(2) mix in the dredging silt and contain sand grains, can increase the Penetration Signature of mud, quicken the fixed of mud, the reduction of erection time;

(3) traditional relatively cofferdam mud is towards filling out epeirogenetic worker method, and construction costs is saved in the after-treatment that can save mud.

Description of drawings

Fig. 1 is traditional cofferdam mud hydraulic reclamation epeirogenetic method schematic diagram;

Fig. 2 is the schematic diagram behind hydraulic reclamation first floor mud and the hydraulic reclamation first floor layer of sand in the Cosolidation with sludge dredging and water draining;

Fig. 3 is lowered into the silt particle mixture that forms in the mud for sand grains in the Cosolidation with sludge dredging and water draining in the deadweight effect;

Fig. 4 for hydraulic reclamation second layer mud among the present invention and hydraulic reclamation second layer layer of sand after schematic diagram;

Fig. 5 is lowered into the silt particle mixture figure that forms in the mud for second layer sand grains in the Cosolidation with sludge dredging and water draining in the deadweight effect;

Fig. 6 be in the Cosolidation with sludge dredging and water draining blowing-filling sludge to design altitude;

Fig. 7 is at mud top layer preloading water bag schematic diagram in the Cosolidation with sludge dredging and water draining.

Have among the above figure: jackstone cofferdam 1, blowing-filling sludge 2, band drain 3, land 4, layer of sand 5, silt particle mixture 6, water bag load 7.

The specific embodiment

Certain caisson type harbour the place ahead, harbour basin has a large amount of marine muds to need desilting; and goods yard, rear district needs a large amount of backfills to carry out epeirogenetic; adopt dredging silt discharging consolidation worker method to carry out reclaiming land around sea for this reason; promptly adopt hydraulic suction dredge that the place ahead basin mud sucking-off is transported to zone, goods yard, rear by conveyance conduit with mud then; adopt this worker's method to handle, the four-bladed vane intensity of the soil body is 30kPa behind the hydraulic reclamation of expection.The concrete operations step is as follows:

1) the method formation thickness of zone employing jackstone is the 0.5m cofferdam in the wings;

2) filling one deck mud in the cofferdam, silt depth 1.5m fills out one deck 0.4m layer of sand at the mud end face then, and layer of sand is lowered in the mud in the deadweight effect, forms the silt particle mixture,

3) repeating step 2), until design altitude;

4) finish after the filling of mud, load the water bag load of 5.0m thickness at the mud end face, through fixed calculating, this worker's method can reach 40kPa in the intensity of piling prepressing barged-in fill after 1 year, can reach expection epeirogenetic effect.

Claims

1, a kind of Cosolidation with sludge dredging and water draining it is characterized in that this method mud is not to adopt a hydraulic reclamation to design height towards filling out, but the layering hydraulic reclamation may further comprise the steps specifically:

1). adopt the method for jackstone to form the cofferdam at offshore;

3). repeating step 2), until design altitude;

2, Cosolidation with sludge dredging and water draining according to claim 1 is characterized in that the mud of filling in the cofferdam adopts strand suction formula hydraulic suction dredge with the marine mud sucking-off, then adopts the method for transportation by lighter or line transportation mud to be sent to the zone that needs hydraulic reclamation.

3, a kind of Cosolidation with sludge dredging and water draining according to claim 1 is characterized in that the method that loads at the mud end face is with sand or water bag preloading.