KR20130053622A - Surface strengthning mehtod of reclamated soft clay - Google Patents

Surface strengthning mehtod of reclamated soft clay Download PDF

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Publication number
KR20130053622A
KR20130053622A KR1020110119116A KR20110119116A KR20130053622A KR 20130053622 A KR20130053622 A KR 20130053622A KR 1020110119116 A KR1020110119116 A KR 1020110119116A KR 20110119116 A KR20110119116 A KR 20110119116A KR 20130053622 A KR20130053622 A KR 20130053622A
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KR
South Korea
Prior art keywords
landfill
drainage
consolidation
dredged
ground
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Application number
KR1020110119116A
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Korean (ko)
Inventor
유창환
박미숙
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유창환
박미숙
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Priority to KR1020110119116A priority Critical patent/KR20130053622A/en
Publication of KR20130053622A publication Critical patent/KR20130053622A/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B11/00—Drainage of soil, e.g. for agricultural purposes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/18—Reclamation of land from water or marshes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2200/00—Geometrical or physical properties
    • E02D2200/16—Shapes
    • E02D2200/1671—Shapes helical or spiral
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2200/00—Geometrical or physical properties
    • E02D2200/16—Shapes
    • E02D2200/1685—Shapes cylindrical
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0037—Clays

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Soil Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

PURPOSE: An outer layer stabilization method of reclaimed ground is provided to ensure the driving performance for various heavy equipment by strengthening the outer layer of reclaimed ground in the early stages through the rapid reduction of pore water and moisture content. CONSTITUTION: An outer layer stabilization method of reclaimed ground comprises the following steps: reclaiming a reclaiming material to the ground and installing a consolidation acceleration drainer to drain the pore water; and inducing a differential head between reclaimed ground and the inside of a consolidation acceleration drainer to drain the water collected inside the consolidation acceleration drainer. The drainage method comprises forcible drainage or natural drainage. The forcible drainage utilizes a pumping unit. The natural drainage sets up an absorbent member inside the consolidation acceleration drainer and sucks up water collected by an osmotic phenomenon for evaporating. [Reference numerals] (AA) Burying step; (BB) Consolidation acceleration drainer installing step; (CC) A differential head inducing step; (DD) Pumping or evaporation; (EE) Drainage; (FF) Settlement induction → Ground improvement

Description

SURFACE STRENGTHNING MEHTOD OF RECLAMATED SOFT CLAY}

The present invention relates to a method for stabilizing the surface layer of dredged landfill, more specifically, to be carried out prior to the full-fledged soft ground improvement work of viscous soil dredged land, which is buried in viscous soil, in particular, various heavy equipment used in soft ground improvement construction In order to secure traffic trafficability (driving performance), the surface layer of dredged land can be strengthened early by lowering the pore water and water content in dredged land, and it is possible to make a remarkable improvement in economy, constructability and stability. It is about surface stabilization method of dredged landfill which can be done.

Recently, as the necessity of the construction of coastal industrial complexes, residential areas, roads, etc. has emerged, the development of the site through coastal reclamation in coastal areas has been actively performed. In the early stages of reclamation in Korea, crushed stone and santo were mainly used as landfill materials, but a lot of costs are required for transportation and securing materials from land. Therefore, the development of construction methods for dredging and reclaiming clay (sea clay) that can be easily killed at sea is important.

These dredged clays have a high water content and are highly compressible. Since consolidation takes place over a long period of time, it takes a long time to stabilize the ground.

Therefore, it is necessary to develop a method that can treat the surface layer of landfilled in ultra soft condition early for access of equipment and manpower for the ground improvement of landfilled with dredged clay.

As such, in general, when dredging a riverside or coastal low-wetland is made of viscous soil, and then developed into a residential area, industrial complex, road, etc., soft ground improvement construction is carried out by applying consolidation dehydration promotion method by filling load.

In this soft ground improvement construction, various heavy equipments for vertical drainage and fill work are used, and it is difficult to enter the equipment because the ground strength of the viscous soil dredging ground is super soft. Therefore, full-fledged soft ground improvement work can be performed only after the surface layer of viscous dredged landfill is strengthened.

As a general method for strengthening the surface layer of viscous soil dredged land, it is a method to dry the viscous soil of the upper surface layer with natural wind or solar heat and settle down after it is left for a certain period of time.

In the case of such natural drying, it takes a long time due to the nature of the viscous soil that does not easily rise to the ground surface moisture. Therefore, it is difficult to start early construction of soft ground improvement work, and as a result, there is a problem of delaying the overall development of the clay landfill.

Accordingly, various methods have been developed for the purpose of early reinforcing the surface layer of a conventional clay landfill. Representative among them is a method of mixing cement or chemical liquid with viscous soil of the upper surface layer to solidify.

However, when cement and chemical mixtures are solidified, there is no great difficulty in applying to small-scale construction, but it is very difficult to apply to large-scale construction because the construction cost is high and the construction speed is greatly reduced.

As such, there is an urgent need for the development of a construction method capable of early treatment of the surface layer of landfilled ground in ultra-soft state for early entry of large equipment and access of manpower for improving the ground of dredged clay.

Therefore, the present invention has been proposed to solve the above problems, dredged landfill to ensure trafficability (driving performance) of various heavy equipment used in soft ground improvement work such as clay landfill It is an object of the present invention to provide a method for stabilizing the surface of dredged landfill ground, which can reinforce the surface of dredged landfill early by decreasing the pore water to water content.

In addition, the present invention can minimize the cover thickness after stabilization of the dredged landfill ground, can reduce the construction cost by the initial entry of large equipment, can improve the workability and increase the construction speed by the initial entry of large equipment, large equipment Another purpose is to provide a surface stabilization method for dredged landfills to ensure stability upon entry.

According to a first aspect of the present invention for achieving the above object, the step of embedding the buried material in the landfill; Installing a consolidation facilitating drainage for draining the gap water of the landfill in the landfill in which the landfill material is embedded; And causing a water head difference between the ground of the landfill and the interior of the consolidation facilitating drainage to drain the water collected in the consolidation facilitating drainage.

The present invention may be a buried material, such as dredged clay or decomposed clay, which has a high water content, high compressibility, and long time to stabilize.

The consolidation facilitating drainage may be formed of a tubular member of various forms having pores.

The step of installing the consolidation facilitating drainage may be poured in the process of embedding the landfill material in the landfill or after the landfill material is embedded in the landfill.

Draining the water collected in the condensation promoting drainage may be at least one of artificially forced drainage and natural drainage.

The artificially forced drainage may forcibly pump water collected in the consolidation drainage through pumping means.

The naturally draining method may naturally evaporate the water in the condensation drainage material. Here, an absorbing member may be installed in the condensation drainage material to suck up and collect water collected in the condensation drainage material through osmosis. have.

The absorbing member may be configured to include an insertion part inserted into the consolidation faucet and an expansion part integrally formed with the insertion part and exposed to an upper surface of the ground.

According to a second aspect of the invention, the method comprising the steps of: embedding a buried material in the landfill; Installing a consolidation facilitating drainage for draining the gap water of the landfill in the landfill in which the landfill material is embedded; And pumping and draining water collected in the consolidation promoting drainage to cause water head difference between the ground of the landfill and the condensation promoting drainage therein.

Further, according to a third aspect of the invention, the step of embedding the buried material in the landfill; Installing a consolidation facilitating drainage for draining the gap water of the landfill in the landfill in which the landfill material is embedded; And naturally evaporating and draining the water collected in the consolidation promoting drainage to cause water head difference between the ground of the landfill and the condensation promoting drainage.

Here, by installing an absorbent member in the condensation promoting drainage to absorb and evaporate the water collected in the condensation promoting drainage through the osmotic phenomenon, the absorbing member is inserted into the condensation promoting drainage and the insertion portion. It is formed integrally with and may be configured to be composed of an extended portion exposed to the upper surface of the ground.

According to the surface stabilization method of dredged landfill according to the present invention, by early reinforcement of the surface layer of dredged landfill ground through rapid reduction of pore number and water content in dredged landfill such as clay landfill ground It has the effect of ensuring the pickability (trafficability) (driving performance) reliably.

In addition, according to the present invention, after the stabilization of the surface layer of the dredged landfill, the cover thickness is minimized, and the construction cost is reduced by the initial entry of large equipment, and the economic efficiency is improved, and the construction performance and the construction speed can be increased by the initial entry of the large equipment. It has an effect.

1 is a process chart showing a process for stabilizing the surface layer of the dredged landfill according to a preferred embodiment of the present invention.
2 is a view showing an example of the consolidation promoting drainage used in the process for stabilizing the surface layer of the dredged landfill according to the present invention.
3 is a view showing the effect of the surface stabilization method of dredged landfill according to the present invention.
4 is a view showing the ground improvement process and the shear strength change process by the surface stabilization method of dredged landfill according to the present invention.
5 is a schematic view for explaining the size of consolidation at a predetermined point of the ground by the surface stabilization method of dredged landfill.

Further objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

Surface stabilization method of the dredged landfill ground according to the present invention will be described with reference to FIG. 1 is a process chart showing a process for stabilizing the surface layer of the dredged landfill according to a preferred embodiment of the present invention, Figure 2 is an illustration of the consolidation promoting drainage used in the process for stabilizing the surface layer of the dredged landfill in accordance with the present invention It is a figure which shows. 3 is a view showing the effect of the surface stabilization method of dredged landfill according to the present invention.

As shown in Figures 1 to 3, the surface stabilization method of the dredged landfill according to the present invention, the first step of embedding the buried material in a predetermined landfill (1); Installing a consolidation facilitating drainage (2) in the landfill (1) in which the embedding material is embedded; And causing a differential head between the ground of the landfill 1 and the inside of the condensation promoting drainage 2 to drain the water collected in the consolidation promoting drainage 2.

As a landfill material embedded in the landfill 1, various landfill materials may be used, but in the present invention, it has a high water content ratio and a high compressibility. Consolidation takes place over a long period of time and landfill materials that take a long time to stabilize the ground are employed. For example, in the present invention, a landfill material having a high water content and high compressibility such as dredged clay or marine clay dredged in coastal or the like may be applied.

The consolidation facilitating drainage (2) is a consolidation facilitation drainage having a structure that can smoothly and quickly flow the pore water of the ground into the interior space, and in particular, the cutting and bending phenomena due to the influence of earth pressure It is preferable to be adopted.

For example, as shown in FIG. 2, it is preferable that the condensation promoting drainage 2 uses a circular drainage (PCD: Plastic Cylindrical Drain) formed of a hole tube having an asymmetric spiral cylindrical structure.

The condensation promoting drainage (ie, circular drainage) 2, which is a perforated tube of this asymmetric spiral cylindrical structure, may be installed, for example, in the landfill 1. On the other hand, the circular drain (2) may be installed in the landfill through a variety of ways, it may be installed in the process of embedding the landfill material (1) or after the landfill material is embedded in the landfill (1). In order to shorten the construction period, it is preferable to install the circular drain material 2 in the process of embedding the landfill material in the landfill (1).

Here, although it demonstrates that it is a perforated tube of an asymmetric spiral cylindrical structure as a preferable example of the condensation promoting wastewater 2, the shape and form are not limited to this. The tubular member according to the present invention is provided with a pore and its cross-sectional shape is a square, a pentagon, a polygon including a polygon or an oval, or its external shape is a square shape, a plate shape, a harmonica shape. Double harmonica shape. What consists of tubular members of various geometries, such as X-shaped core shape, plate-shaped circular coupling shape, and NW shape, is included in this invention.

Next, the step of draining the gap water (water) collected in the consolidation promoting drainage (2) by causing a differential head between the ground of the landfill 1 and the interior of the consolidation promoting drainage (2) is largely artificial. This can be divided into forced drainage and natural drainage.

The artificially forced drainage method may include, for example, forcibly pumping water (gap water in a dredged landfill) in the consolidation promoting drainage material 2 using pumping means (not shown). Accordingly, the head difference between the landfill site and the inside of the consolidation promoting drainage is artificially generated, and the generated water head difference causes the flow of water (gap water) in the ground, and induces consolidation by lowering the infiltration line and eventually improves the ground. .

On the other hand, the natural drainage method may include, for example, to allow the water (gap water in the dredged landfill) to be naturally evaporated in the consolidation promoting drainage (2). In addition, the present invention provides an absorbing member (not shown) for sucking up the water collected in the condensation promoting drainage material 2 using an osmotic phenomenon in order to further promote the natural evaporation of the water collected in the condensation promoting drainage material 2. It may further include.

The absorbing member (not shown) may be composed of an insertion part inserted into the consolidation faucet 2 and an extension part integrally formed with the insertion part and exposed to the upper surface of the ground. The evaporation effect can be further enhanced by increasing the extension area of the extension.

Next, the ground improvement process by the surface stabilization method of the dredged landfill ground according to the present invention will be described in detail with reference to FIGS.

4 is a view showing the ground improvement process and shear strength change process by the surface stabilization method of dredged landfill according to the present invention, Figure 5 is to explain the size of consolidation at a predetermined point of the ground by the surface stabilization method of dredged landfill Schematic for.

As shown in Fig. 4 and Fig. 5, in the surface stabilization method of the dredged landfill according to the present invention, a consolidation promoting drainage (circular drainage) 2 is poured into the landfill 1 in which the landfill material is embedded (Step 1). Here, the shear strength of the ground of Step 1 is referred to as C 0 . Then, the water collected in the consolidation drainage (circular drainage) 2 through artificial drainage using pumping means or natural drainage using natural evaporation (which may include an absorbing member) as described above (in the ground) Drainage) to outside (Step 2). Here, the shear strength of the ground of Step 2 is referred to as C 1 .

The water head difference is generated between the ground and the consolidation faucet 2 by draining the water collected in the consolidation faucet 2 in the step 2, and the water (gap water) flows in the ground by the generated water head difference. Is generated and water (gap water) is collected into the condensation promoting wastewater 2 again (Step 3). Here, the shear strength of the ground of Step 3 is referred to as C 2 .

When the process up to Step 3 is performed as described above, the upper ground of the infiltration line is changed (γ sub → γ sat ) (see FIG. 1), and thus ground subsidence is caused as the effective stress increases, and drainage of pore water in the ground is performed. The effect is promoted. Looking at the change in shear strength in Step 1 to Step 4, such as C 0 ≒ C 1 <C 2 <C 3 is obtained.

In other words, as shown in Fig. 5, the decrease in the infiltration line causes an increase in the effective load (ΔP), thereby inducing consolidation, and eventually the ground is improved (P 01 <P 02 ).

Through the surface stabilization method of dredged landfill in the present invention as described above, it is possible to reliably secure the traffic layer (driving performance) of various heavy equipment used for soft ground improvement construction by early strengthening the surface layer of dredged landfill Can be.

In addition, after stabilizing the surface of the dredged landfill, it can minimize the thickness of the cover, reduce the construction cost by the early entry of large equipment, improve the economics, and improve the constructability and the construction speed by the initial entry of the large equipment.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes within the scope not departing from the technical spirit of the present invention are possible in the art. It will be evident to those who have knowledge of.

1: landfill
2: consolidation drainage (round drainage)

Claims (14)

Embedding the buried material in the landfill;
Installing a consolidation facilitating drainage for draining the gap water of the landfill in the landfill in which the landfill material is embedded; And
Draining water collected in the consolidation wastewater by causing a head difference between the ground of the landfill and the interior of the consolidation wastewater;
Surface stabilization method of dredged landfill containing a. The method of claim 1,
The landfill material embedded in the landfill is a landfill material having a high water content.
Surface stabilization method for dredged landfill. The method of claim 2,
The landfill material is dredged clay or marine clay
Surface stabilization method for dredged landfill. The method of claim 1,
The consolidation promoting drainage is formed using a tubular member having a hole
Surface stabilization method for dredged landfill. The method of claim 1,
Installing the consolidation promoting drainage
Comprising pouring the landfill material into the landfill or after the landfill material is embedded in the landfill
Surface stabilization method for dredged landfill. The method of claim 1,
Draining the water collected in the condensation promoting drainage is made of at least one of artificially forced drainage and natural drainage
Surface stabilization method for dredged landfill. The method according to claim 6,
The artificially forced drainage may be performed by forcibly pumping water collected in the consolidation drainage through pumping means.
Surface stabilization method for dredged landfill. 8. The method according to claim 6 or 7,
The naturally draining method is a method of naturally evaporating water in the condensation promoting drainage.
Surface stabilization method for dredged landfill. 9. The method of claim 8,
The naturally draining method naturally evaporates the water in the consolidation wastewater,
An absorption member is installed in the condensation promoting drainage to suck up and collect water collected in the condensation promoting drainage through osmosis.
Surface stabilization method for dredged landfill. 10. The method of claim 9,
The absorbing member is formed of an insertion portion inserted into the consolidation faucet and an expansion portion formed integrally with the insertion portion and exposed to the upper surface of the ground.
Surface stabilization method for dredged landfill. Embedding the buried material in the landfill;
Installing a consolidation facilitating drainage for draining the gap water of the landfill in the landfill in which the landfill material is embedded; And
Pumping and draining water collected in the consolidation wastewater to cause a head difference between the ground of the landfill and the interior of the consolidation wastewater;
Surface stabilization method of dredged landfill containing a. Embedding the buried material in the landfill;
Installing a consolidation facilitating drainage for draining the gap water of the landfill in the landfill in which the landfill material is embedded; And
Naturally evaporating and draining the water collected in the consolidation wastewater to cause water head difference between the ground of the landfill and the interior of the consolidation wastewater;
Surface stabilization method of dredged landfill containing a. The method of claim 12,
An absorption member is installed in the condensation promoting drainage to suck up and collect water collected in the condensation promoting drainage through osmosis.
Surface stabilization method for dredged landfill. The method of claim 13,
The absorbent member is
It is composed of an insertion portion inserted into the consolidation promoting drainage and an expansion portion formed integrally with the insertion portion exposed to the upper surface of the ground
Surface stabilization method for dredged landfill.
KR1020110119116A 2011-11-15 2011-11-15 Surface strengthning mehtod of reclamated soft clay KR20130053622A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170030263A (en) 2015-09-09 2017-03-17 주식회사 대덕지에스 Lightweight material and solid structure construction method using this
CN112681041A (en) * 2020-12-14 2021-04-20 中电建路桥集团有限公司 Construction method of salinized soil roadbed and salinized soil roadbed

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170030263A (en) 2015-09-09 2017-03-17 주식회사 대덕지에스 Lightweight material and solid structure construction method using this
CN112681041A (en) * 2020-12-14 2021-04-20 中电建路桥集团有限公司 Construction method of salinized soil roadbed and salinized soil roadbed

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