KR20120001856A - Method for reinforcing soft ground using geosynthetics and open channel - Google Patents

Abstract

PURPOSE: A surface reinforcing method of soft ground using geo-synthetics and an open path is provided to reduce construction cost and time and ensure stability and safety of construction by maintaining stable bearing force from earth load and equipment load. CONSTITUTION: A surface reinforcing method of soft ground using geo-synthetics and an open path is as follows. Open paths(20,20'), which are permeable and dischargeable, are installed so that reclaimed soft ground(10) can discharge surface water and pore water. A surface layer and soft ground near the open paths are solidified due to the permeable and dischargeable actions of the open paths and evapotranspiration by sunlight. If a solidified area is created on the surface layer and near the open paths, the open paths are uses as working paths to transport geo-synthetics(30) and deploy it on soft ground.

Description

Soft ground surface reinforcement method using geosynthetics and water channel {Method for reinforcing soft ground using geosynthetics and open channel}

The present invention is for reinforcing the surface layer of the soft ground, and more particularly, the soft ground solidified by the channel and the geosynthetics structure settled in the channel are applied to the soft ground. Excessive ridges or settlements can be suppressed to prevent the destruction of soft ground during cover laying and soil renovation.

Recently, shore reclamation projects have been actively promoted in order to secure port construction and free land due to industrialization and economic development at home and abroad.

At this time, the landfill material mainly uses marine clay accumulated on the seabed, and transfers the above-mentioned marine clay in a state in which water and granules are mixed by dredgers, etc., to carry out landfill construction for the corresponding area.

In the dredged soil of such landfills, the water content is 200-300% before and after the completion of the construction, and since it is a sludge state with little ground strength, it is not easy for not only construction machinery but also people to enter.

Accordingly, the surface reinforcement method for improving the dredged landfill requires a soft ground surface reinforcement method that exhibits a support force capable of covering the soil and entering the equipment, that is, a support force that does not occur due to the elevation and settlement. .

Recently, the most common soft ground surface reinforcement method is geosynthetics using surface layer reinforcement method. It spreads and spreads geosynthetics on the soft ground and covers the soil of high quality with small equipments step by step on the geosynthetics. As the construction method that can make this possible, it is the most common among the soft ground surface reinforcement methods, which has abundant construction experience and track record.

Geosynthetics is a product that is used for civil works in the environment such as civil engineering, etc. Types of general geosynthetics are Geogrids, Geotextiles, Geomembranes, Geonetets ), Geomats, Geopipes, Geocomposites, Corenet, etc.

Such geosynthetics is mainly used for the purpose of separation, filtration, reinforcement and drainage of the ground, and recently, it is actively used for the purpose of reinforcing soft ground.

When geosynthetics is buried on the soft ground, the reinforcement effect is further enhanced by the resistance due to the tensile strength of the geosynthetics itself and the friction between the soil (soft ground) and the geosynthetics.

As a result, the soft ground and geosynthetic composites are increased in strength, thereby improving stability and reducing settlements on the cover and equipment loads on the soft ground.

As such, the reinforcement function of geosynthetics is to enhance the stability and settlement of cover load and equipment load by tensile strength, and its own tensile strength as well as sufficient frictional force with soft ground should be secured.

At this time, if the frictional force between the soft ground and the geosynthetics is less than the tensile force acting from the outside, the geosynthetics will be sucked into the soft ground and a large settlement will occur, causing the depression of the soft ground. Will not be. Thus, geosynthetics shows that the greater the tensile strength and the greater the friction force with soil (soft ground), the higher the bearing capacity, stability, and greater effect.

In the soft ground surface reinforcement method using geosynthetics, the reinforcement function of geosynthetics itself has been widely used in soft ground. Therefore, the material aspect of geosynthetics, that is, the development of tensile strength has been remarkably advanced and high quality. It is time to select and use Geosynthetics.

However, it is true that the friction between soil (soft ground) and geosynthetics is very limited to support excessive cover and equipment loads. The geosynthetics product is soft and soft ground is hardly supported by soil. Since the frictional force between the soft ground and the geosynthetics is very small, the resistance to the tensile strength of the geosynthetics itself in the soft ground and the frictional force between the soil (soft ground) and the geosynthetics alone are applied. It is very limited and almost impossible to support the load stably.

Thus, as an efficient method for reinforcing the insufficient friction force, geosynthetics can be settled on the revetment or soft ground, so that the improved reinforcement of geosynthetics can be expected.

However, this reinforcement is also not applicable to large dredged landfills with long lengths between shores, and is currently only available on small dredged landfills with narrow distances between shores without excessive cover and equipment loading. There is a limited trend to use geosynthetics using geosynthetics.

Accordingly, the surface reinforcement method is urgently required to provide a stable support force from the cover load and equipment load even in large dredging landfills with long lengths between shores.

The present invention has been made to solve the problems as described above, the number of soft ground and the number of the solid ground by installing a water channel at a predetermined interval on the soft ground top floor and draining the surface water and the gap water by using a natural drainage or a water pump for a certain period of time. By applying the geosynthetics structure anchored in the furnace, the soft ground caused by the upper load is suppressed to prevent excessive uplift and settlement, thus ensuring the trafficability of the equipment when laying cover and improving the ground, and preventing the soft ground from being destroyed. It is an object of the present invention to provide a soft ground surface reinforcement method using geosynthetics and channel to improve the problems of the existing soft ground surface reinforcement method to ensure economic and construction stability.

The present invention for achieving the object as described above, the step of installing a channel that can be permeable and drained so as to discharge the surface water and gap water of the soft ground is completed; Causing the soft ground and surface layer around the channel to solidify due to the permeation and drainage of the channel and the evaporation by sunlight; Deploying geosynthetics on a soft ground and transporting the geosynthetics by using the channel as a working path when a solidified area about the channel and the surface layer is generated; Fixing the unfolded geosynthetics to the channel and the solidified area; Performing a cover work on the geosynthetics through the cover material installation equipment; is performed by sequentially.

The present invention improves the problems of the existing surface reinforcement method when covering soils in soft ground with high water content sludge, and can provide stable bearing capacity from covering loads and equipment loads even in large dredging landfills with long lengths between shores. It is possible to reduce construction cost, secure stability and safety of construction, and shorten construction period.

1 is a cross-sectional view of the construction of the soft ground by the surface reinforcement method according to the present invention
2a to 2d is a sequential process diagram of the surface reinforcement method according to the present invention,
Figure 2a is a state diagram forming a channel on the soft ground
2B is a state diagram in which a solidified area is generated by the number of soft ground channels
2c is a state in which the geosynthetics is expanded on the soft ground
Figure 2d is a state diagram laying cover material on geosynthetics
3a to 3d is an exemplary view of geosynthetics fixing in the surface reinforcement method according to the present invention,
3a is a state diagram of fixing by the soil
Figure 3b is a state of fixation by the trench and the weight
Figure 3c is another embodiment of the fixing state by the trench and the weight
Figure 3d is another embodiment of the fixing state by the trench and the weight
Figure 3e is a state of fixation by the trench and the structure
Figure 3f is another embodiment of the fixing state by the trench and the structure
Figure 3g is another embodiment of the fixing state by the trench and the structure
Figure 3h is a state of fixation by the rope

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor may properly define the concept of the term to describe its invention in the best possible way And should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of the construction of the soft ground by the surface reinforcement method according to the present invention.

In general, in order to construct a soft ground filled with marine clay, which is highly functional, highly deformable, and hardly supportive, as a site, first of all, it is a cover method using surface reinforcement method to support the entry and construction load of construction equipment. In this case, if the load of the soft ground load over the soft ground is loaded, the soft ground will be deformed and settled, and the accident will occur and the construction will be impossible.

In order to prevent this, generally, geosynthetics is installed on the soft ground, reinforcement of bearing capacity, and then covered.

However, in soft soils with large-scale, high-function, deformable, and little support, landfilled with marine clays depend on the tensile strength of geosynthetics itself and the frictional force between the soft ground and geosynthetics. It is virtually impossible to support an excessive load of equipment.

In the soft ground under such conditions, an efficient method for the geosynthetics having a very high tensile strength to function properly may be to anchor the geosynthetics to a highly supportive ground or structure.

That is, when settlement and deformation of the ground due to excessive equipment and cover load occur, the existing method supports the upper load by the frictional force between the soil (soft ground) and the geosynthetics and the tensile strength of the geosynthetics itself. If the geosynthetics is settled on a highly supportive ground or structure, the geosynthetics is not only able to exert its tensile strength, but the geosynthesis is accompanied by friction between the existing and unstable soil (soft ground) and geosynthetics. An efficient and reliable fixation will be added to the ticks.

Therefore, the surface reinforcement function is dramatically increased by showing the tensile strength of geosynthetics itself. Therefore, the ground deformation caused by the settlement of the equipment and the cover load is suppressed reliably, so that no sinking accident occurs. It can be done.

Therefore, geosynthetics, which has a very high tensile strength, is an efficient and reliable way for the function of landfills buried with marine clays to be very large in high strength, deformable, and little supportive sludge. It is a method of anchoring tics to ground or structures with high bearing capacity.

Therefore, an efficient and reliable method for anchoring geosynthetics to highly supportive grounds or structures in soft soils with large-scale, high-function, deformable, and little-supporting sludge landfilled with marine clay In order to exert the tensile strength possessed by geosynthetics in the above soft ground, the soft ground having little strength at a part or at regular intervals is considered in consideration of the load on the top and the tensile strength, workability, and economic efficiency of the geosynthetics. It must solidify.

At this time, the type of geosynthetics 30 is used, such as Geogrids or Geotextiles, Geomembranes, Geonets, Geomats, Geopipes, Geopipes One or more selected from composites and core nets may be applied. The geosynthetics 30 as described above is widely manufactured with various materials and physical properties depending on the application field and physical characteristics, and thus is widely used. Depending on the type of the appropriate choice will be used.

Based on this, the soft ground surface reinforcement method of the present invention will be described as follows.

* Stage 1

In order to anchor the geosynthetics 30 to the highly supportive ground or structure in the soft ground 10 in order to solidify the soft ground in consideration of the load of the upper part and the tensile strength, workability and economic efficiency of the geosynthetics. In order to drain the surface water and the gap water to the completed soft ground, the water passages 20 and 20 'which are permeable and drainable as shown in FIG. 2A are installed on the soft ground at a part or regular intervals.

At this time, the channel (20, 20 ') is ideal, such as patent registration No. 784174 devised by the applicant of the present invention, if necessary, additional drainage in the cross direction at the bottom of the channel as described above. It may be configured. In addition, the spacing and specifications for the channel can be adjusted appropriately in consideration of the water content of the soft ground, the construction period, the ground condition and the like.

* Step 2

Install the waterways 20, 20 'in the soft ground 10 at a part or at regular intervals and discharge the water introduced into the water through the soft ground to the outside of the soft ground, and with the soft ground around the water channel with the evaporation of sunlight. As the surface layer solidifies, the strength of the soft ground increases.

 Therefore, in order to secure the fixing force necessary for supporting the load acting from the upper part of the soft ground 10 and exerting the tensile strength of the geosynthetics 30 as shown in FIG. After a certain solidification treatment period has elapsed so that the soft ground and the solidification area 11 of the surface layer are expanded.

At this time, 100% or less of the water content ratio of the solidification region 11 is the most ideal. When the water content ratio of the solidification region 11 is high, the fixing force necessary for exerting the tensile strength of the geosynthetics 30 is weakened. The lower the water content for the solidified region, the better.

* Step 3

The geosynthetics 30 suitable for the site conditions is applied on the soft ground solidified by the water passages 20 and 20 'which can be permeated and drained, and the water passages 20 and 20 which are shown in FIG. ') Is used as a work path to transport and bond the geosynthetics (30).

* 4 levels

Geosynthetics 30 is unfolded and unfolded in the waterways 20 and 20 'and at the solidified area 11 of the soft ground, which are installed at a portion or at regular intervals, and the waterways 200 (20') or the solidified areas ( Settle using 11).

At this time, as a fixing method for the geosynthetics,

1. As shown in FIG. 3A, in the state in which the geosynthetics 30 is unfolded and deployed on the soft ground 10 having the channel 20, 20 'and the solidification area 11, these channel 20 The pressure-sensitive soil 21 at the surface position of the geosynthetics 30 at the top of the 20 or the top of the solidified region 11 or corresponding to the channel 20, 20 ′ and the top of the solidified region 11. ) To install the geosynthetics (30) by the weight of the compacted soil (21).

2. As shown in FIG. 3B, a trench 22 is formed in the channel 20 and 20 ', and the geosynthetics 30 is inserted into the trench 22, and then the trench 22 is formed. Method of filling a heavy material (23) of high quality soil or concrete in the inside).

3. As shown in FIG. 3C, a trench 22 'is formed in the solidified region 11 and the geosynthetics 30 is inserted into the trench 22'. 23 ') to fill and settle.

4. As shown in FIG. 3D, trenches 22 and 22 'are formed in the channel 20, 20' and the solidified region 11, respectively, and the inside of the trenches 22 and 22 'is geometried. After the synthetics (30) is inserted, the trench (22) (22 ') is filled with high quality earth or concrete weight (23) (23') to fix.

5. If the geosynthetics 30 has a sufficient tensile strength as shown in FIG. 3E, the trenches 22 are formed in the channel 20 and 20 ′, and then the concrete structure 24 is formed in the trenches 22. Forming, and fixing the geosynthetics (30) using an anchor bolt (not shown in the drawings) embedded in the concrete structure (24).

6. As shown in FIG. 3F, when the geosynthetics 30 has sufficient tensile strength, the trench 22 'is formed in the solidified region 11, and then the concrete structure cured by concrete in the trench 22'. A method of fixing the geosynthetics (30) by using an anchor bolt (not shown in the drawing) and the like formed in (24 ') and embedded in the concrete structure (24').

7. If the geosynthetics 30 has sufficient tensile strength, as shown in FIG. 3G, the respective trenches 22, 22 'are placed in the upper part of the channel 20 and 20' and in the solidified area 11. After the formation, the concrete structures 24 and 24 'are formed in the trenches 22 and 22', and anchor bolts (the symbols in the drawings are omitted) are embedded in the concrete structures 24 and 24 '. How to fix the geosynthetics 30 using.

8. As shown in FIG. 3H, there may be a method of fixing the waterways 20, 20 'and the geosynthetics 30 by a rope 25 or the like.

* 5 levels

After the settlement of the geosynthetics 30 is completed, as shown in FIG. 2D, the cover work is carried out to install the cover material 40 from the center on the geosynthetics 30 by using the cover material installation equipment, and then gradually alternately to both sides. To cover the soil. Here, the method of laying the cover material as described above is based on the patent registration No. 0760653 issued by the applicant of the present invention by the weight of the equipment and the cover material acting on the soft ground by alternating the cover work from the center to both sides It is to prevent the pressure from being biased to prevent settlement or elevation of the ground.

Therefore, even through the step-by-step work process as described above, even a large dredging landfill with a long length between the revetment can have a stable bearing capacity from the cover load and equipment load.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention as defined by the appended claims. Examples should be understood.

10: soft ground 11: solidification area
20,20 ': By the number 21: Absorption soil
22,22 ': Trench 23,23': Heavy
24,24 ': concrete structure 25: rope
30: Geosynthetics
40: cover material

Claims (11)

Installing a channel for permeation and drainage so as to discharge the surface water and the gap water of the soft ground in which the landfill is completed;
Causing the soft ground and surface layer around the channel to solidify due to the permeation and drainage of the channel and the evaporation by sunlight;
Deploying geosynthetics on a soft ground and transporting the geosynthetics by using the channel as a working path when a solidified area about the channel and the surface layer is generated;
Fixing the unfolded geosynthetics to the channel and the solidified area;
Soft soil surface reinforcement method using the geosynthetics and channel through the step of performing the cover work on the geosynthetics through the cover material installation equipment.
The method of claim 1,
Geosynthetics is Geogrids or Geotextiles, Geomembranes, Geonets, Geomats, Geopipes, Geocomposites, Coirnets net) soft ground surface reinforcement method using a geosynthetics and channel.
The method of claim 1,
Geosynthetics fixing step is a soft ground surface reinforcement method using geosynthetics and channel, characterized in that the pressure of the soil is installed on top of the geosynthetics corresponding to the channel and the solidified area.
The method of claim 1,
The geosynthetics fixing step is characterized by the formation of a trench on the upper side of the channel, inserting the geosynthetics into the trench, and filling the heavy material of earth or concrete in the trench. Ground surface reinforcement method.
The method of claim 1,
Geosynthetics fixation step is to form a trench in the solidified area, geosynthetics is inserted into the trench, and the ground layer of soft ground using geosynthetics and channel is characterized by filling the heavy material of earth or concrete in the trench. Reinforcement method.
The method of claim 1,
Geosynthetics fixing step is to form a trench in the channel and the solidification area, insert the geosynthetics in the trench and fill the heavy weight of earth or concrete in the trench using geosynthetics and channel Soft ground surface reinforcement method.
The method of claim 1,
The geosynthetics fixing step consists of forming a trench in the upper part of the channel, curing the concrete structure in the trench, and fixing the concrete and the geosynthetics with anchor bolts. Soft ground surface reinforcement method.
The method of claim 1,
Geosynthetics fixation step is a weakness using geosynthetics and channel, which is formed by forming trenches in the solidified area, curing concrete structures in the trenches, and fixing concrete and geosynthetics with anchor bolts. Ground surface reinforcement method.
The method of claim 1,
Geosynthetics and geosynthetics is characterized in that the fixing step of the geosynthetics is formed by forming a trench in the upper part and the solidified area of the channel, curing the concrete structure in the trench, and fixing the concrete and the geosynthetics with anchor bolts. Soft ground surface reinforcement method using channel.
The method of claim 1,
Geosynthetics settlement step is a soft ground surface reinforcement method using a geosynthetics and a canal, characterized in that the coupling between the channel and the geosynthetics by a rope.
The method of claim 1,
The cover layer step is a soft ground surface reinforcement method using a geosynthetics and channel, characterized in that it is carried out gradually alternately to both sides from the upper center of the soft ground.

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