KR20020068988A - Soil Improvement Method of Soft Clay Using Sea Water as Surcharge Load in Large Land - Google Patents

Abstract

PURPOSE: An improvement method for the soft ground of a large site using seawater as consolidation load is provided to minimize environmental disruption and to improve the soft ground with low construction expenses. CONSTITUTION: The improvement method for the soft ground of a large site using seawater as consolidation load comprises the steps of spreading a sand mat layer on the soft ground, placing vertical drains, installing a membrane liner and draining consolidated leachate, then containing water.

Description

Soil Improvement Method of Soft Clay Using Sea Water as Surcharge Load in Large Land}

The present invention is a method of applying the load used as the preloading of seawater in the pre-loading + vertical drainage method commonly used for the improvement of the soft ground, so as to be able to load an equal load on the soft ground at one time. It is about a new soft ground improvement method

In general, in the port construction work such as container wharf construction, the ground used as container yard or related site is super soft ground dredged by sea clay or soft sea clay ground. These grounds are too soft to be used for the above-mentioned usages, and when used without ground improvement, there is a lack of bearing capacity and a large amount of settlement occurs when a load is applied in use, which causes problems in use. In order to solve this problem, the pre-loading method is a commonly used method to improve the soft ground. This method loads a load that is greater than the load to be applied in advance and generates the settlement in advance so that later settlement during use can be allowed to use the site.

In the pre-loading method, it is common to achieve rapid consolidation settlement of soft ground by reducing the drainage distance of consolidation leachate by using vertical drainage such as sand drain and PBD in addition to loading. As the load used in the pre-loading method, there are soil, atmospheric pressure, and water. Among them, soil is generally used. However, when soil is used, it is a native problem of soil-soil. Due to differences in the proposed assumptions and differences, the problems such as local sinking and other subsidence during soft ground improvement occur. The loading method using atmospheric pressure is called vacuum consolidation method. It is a method of isotropically consolidating the soft ground by applying negative pressure to the ground using a vacuum pump, which has the advantages of shortening the consolidation period and equal load, but using airtight sheets and special vertical drainage. It is a fatal disadvantage that the construction cost is high due to the operation of the vacuum pump and the like, and the application area is small and the load can only be applied to about 8 t / m ² .

On the other hand, the method of using water as a load has the advantage that the consolidation settlement calculation theory and practice are well matched and very inexpensive construction cost is required because it uses water as a loading material, but the development of water curtain, condensate leachate drainage method, monitoring method, Due to problems such as the repair of cracks in the membrane, it is impossible to load water on a large-scale site, and in some constructions, it has been used as an ancillary role to load a load of soil or vacuum condensation in a small area.

Therefore, in order to use the soft ground improvement method using water as a load on a large-scale site, the development of a water curtain, consolidation leachate drainage method, a monitoring method and repair method of the water curtain should be solved.

The present invention is to solve the above problems, and an object of the present invention is to minimize the damage to the natural environment, and to enable a water-loaded soft ground improvement method with the advantages that the construction theory and consolidation settlement calculation theory and construction are well matched It is to provide a method.

1 is a schematic diagram of a soft ground improvement method according to the present invention

Figure 2 is a detailed view of the soft ground improvement method according to the invention 1

Figure 3 is a detailed view of the soft ground improvement method according to the invention 2

Figure 4 is a detailed view of the soft ground improvement method according to the invention 3

<Explanation of Drawing Symbols>

1. Flexible lining 2. Shear resisting lining

3. PVC pipe 4. Steel pipe

5. Steel pipe support 6. Pump

7. Horizontal drainage 8. Housing

9. Vertical drainage

According to the present invention, in a large-scale soft ground on the beach or river, where water is easily available, a water curtain, a condensed leachate drainage method, a method of monitoring the water curtain, and the fresh water to improve the soft ground using water as a load. It consists of a repair method. A soft ground improvement method is provided, which includes laying a sand mat layer on the soft ground, placing a vertical drainage material, installing a water barrier on it, draining the consolidation leachate, and then improving the soft ground by fresh water. .

According to the first aspect of the present invention, there is a need for a body of a predetermined height and a water shield to separate the water from the ground in order to desalination water. In this case, the rigid layer may be used to resist the generated stress and the flexible layer may be free of deformation, but the soft layer may be used because the settlement and deformation of the soft ground are considerably large. These flexible barriers have low ultimate stresses, so care should be taken to avoid possible stresses. The place where stress can be generated is the part where the body and the lining layer are in contact. When the lining layer comes in contact with the piled up soil, it causes the displacement of the lining layer due to the ground subsidence. Therefore, the curtain is processed to move freely. In order to prevent this tension from occurring, a thin geotextile or a lining film is placed on the body to prevent direct contact between the sediment and the soil of the body or as settled in the soft ground where the body and the soft ground meet as shown in Fig. 3. When the installation is characterized in that the wrinkles to prevent the tensile force is generated in the membrane.

According to the second aspect of the present invention, in order to drain the condensed leachate generated when the soft ground is consolidated by applying water load, a pipe having reached the sand mat layer through the flexible water barrier as shown in Fig. 4 is installed, and A device is provided which allows the installation of a pump to drain consolidation leachate.

According to the third aspect of the present invention, since the soft liner is installed on the soft ground, the settlement system and the excess pore pressure gauge for the settlement and settlement management of the soft ground are buried in the ground, and the measurement is performed by wire or wirelessly embedded in the ground. Will be performed. In addition, in order to ensure the stability of the flexible liner under water load load, the electric system or the acoustic monitoring system used as a landfill management method is used as a monitoring system that can determine whether the crack of the flexible liner.

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

1 illustrates a soft ground improvement method using water as a loading load according to the present invention, a water repellent membrane and consolidation leachate drainage method capable of freshening water to improve the soft ground using water as a load in the soft ground. It consists of a monitoring method and a repair method of the curtain.

After installing a sand mat layer on the soft ground as shown in Figure 1 and installing a vertical drainage material, install a water curtain on it to drain the condensed leachate, and then improve the soft ground, characterized in that to improve the soft ground by fresh water A method is provided.

2 and 3 illustrate a method for excluding stresses that may occur when the liner is in contact with the body, and the liner is not in contact with the body or is wrinkled by the amount of settlement in advance to suppress the generation of tensile stress.

4 shows a method of draining the consolidation leachate by installing the pipe to the sand mat layer and installing a pump in the pipe by the method of draining the consolidation leachate generated during consolidation.

As described above, according to the present invention, a soft ground improvement method for minimizing the destruction of the natural environment and improving the soft ground at an inexpensive construction cost is proposed, so that the improvement of the large soft ground where seawater or river water can be used becomes easy. It is expected to be of great help to national development.

Claims (1)

Patent on large-scale soft ground improvement method using water as load It consists of a water line membrane, condensed leachate drainage method, a monitoring method and a repair method of the water layer to improve the soft ground by using water as a load on the soft ground. It is a soft ground improvement method that can drain water and maintain the curtain.