KR20020017108A - The construction method of landfill and pile in soft soil using the potential hydraulic material improved - Google Patents

Abstract

PURPOSE: A landfill formation method on the soft ground using latent hydraulic materials is provided to function as a drainage layer while improving the soft ground, to have effects as a bearing layer and a cut-off layer after completing the function of a drainage layer and to form a landfill stabled structurally and advanced environmentally. CONSTITUTION: A landfill formation method on the soft ground using latent hydraulic materials comprises the steps of drying, crushing and sieve-shaking latent hydraulic materials such as byproduct lime, blast furnace slag, steel furnace slag, ash, etc. to have an appointed grain size, dissolving in a solvent by weighing fatty acid, lignin sulfonic acid and sulfonate, oxy carbonic acid and carbonate, sugar or soluble salts of Zinc and hydraulicity-lag materials at 0.1-2.0 percent weight against hydraulic materials, mixing the latent hydraulic materials and the solution, then drying to have 5-percent water content and composing vertical and horizontal drainage materials for improving the soft ground of a landfill using the manufactured materials having the effect of lagging the formation of a film and hydraulicity to be used for the protection of a bearing pile and a cut-off layer and as a cut-off layer.

Description

The construction method of landfill and pile in soft soil using the potential hydraulic material improved

Waste Landfill Site Construction Method in Soft Ground

The most representative sanitary waste landfill in Korea where the lower ground such as coast or swamp is weak A cross section of the landfill is shown in FIG. 1.

In Figure 1, the excess pore drainage layer is used as a layer for draining the excess pore water generated during consolidation of the lower ground by the waste landfill load, the nonwoven fabric on the excess pore drainage layer is to protect the solidified layer. The solidification layer is intended to protect the upper order layer by increasing the strength of the ground by using lime and cement-based solidifiers. The order layer is a layer to prevent the leakage of leachate. I was. Compared with other landfills in the soft ground, the soft ground was reinforced by the excess pore drainage layer and the solidified layer, but it is structurally unstable for unequal sedimentation over 30cm but oversedimentation.

Waste reclamation sites in other soft ground areas are installed only on the top of the soft ground, and the bottom of the bottom layer is the synthetic material, synthetic rubbers, synthetic fibers, etc. The synthetic resin clay order material (GCL) combining clay mineral and special powder, clay-bentonite order material using bentonite characteristics, and soil type order material which reduced the strength and permeability by using the solidified material in clay.

Thus far, the landfill construction technology has been the mainstream technology that considers only the order-of-order capacity without considering the ground conditions of the landfill construction area.

Technology using latent hydraulic materials

Looking at technologies using latent hydrophobic materials, the technologies using Busan lime include road substrates and subbase materials, soil improvement materials, landfills, soft ground reinforcement materials, bricks and boards as building materials.

Coal ash is not only used in cement raw materials (pozzolans), grouting materials, landfill materials, foundation foundation materials, asphalt fillers, roadbeds and roadbeds, building materials such as tile bricks, lightweight aggregates, soil improvers, artificial reefs, It is also used in plastics.

And other materials, slag, cement manufacturing raw materials, fill and landfill material, road base and auxiliary base, soft ground dehydration and compaction material, soft ground agitated mixed solid material, mat method material, asphalt filler, tile brick, etc. As well as for the construction of the building materials, it is used in various ways in everybody.

A similar technique related to the present invention is to use slag as a soft ground dewatering and mat processing material, but this technique has been applied in developed countries, but it is intended to be used as a substitute for natural history by adjusting the particle size to the equal particle size side. will be.

Coal ash, a latent hydraulic material, forms and cures hydrates such as lime silicate and tricalcium aluminate, and slag cures and forms calcium silicate hydrate and calcium alkoxide hydrate by stimulating action such as alkali and sulfate. The speed takes tens to several months, and if the particle size is not controlled, the water permeability decreases rapidly with hydrate formation after curing and becomes α × 10 ⁻⁶ cm / sec after 4-5 months. The period in which the hydrate is formed and the water permeability decreases is shorter than the soft ground improvement period (about 1 year) and is not suitable as a drainage layer material.

In order to solve such a problem, as shown in FIG. 3, evenly adjusting the particle size distribution to improve permeability is good on the permeable surface, but after the construction of the landfill, the leachate passage acts as a leachate passage due to the high permeability when the leachate leaks. Diffusion to ground

In addition, if the lower soft ground is not improved when constructing a waste landfill in the soft ground, the leachate treatment system will be rendered ineffective due to uneven sedimentation, over-sedimentation, and excess pore water pressure caused by the waste landfill load.

Therefore, there is a need for a method to protect the leachate treatment system of landfills in soft ground, and the material applied to this method maintains its role as a drainage layer for increasing the bearing capacity of the soft ground for a sufficient period of time and after supporting the soft ground, It is an object of the present invention to make a role.

1 is domestic existing Waste Landfill Section

2 is a waste landfill standard diagram to which the improved diving rigid material is applied.

3 is a drainage cross-sectional view with uniform granularity

4 is a cross-sectional view of the drainage layer to which the present invention is applied.

Fig. 5 shows the excess pore discharge shape between the encapsulated particles.

Dry lime, coal ash and slag, which are latent hydraulic materials, are dried and crushed to a particle size of [Table 1]. The crushed material has an effective particle diameter (D ₁₀ ) of 0.15 mm or more and a permeability coefficient of about α × 10 ^-6 cm / sec.

Fatty acid, lignin sulfonic acid and salts thereof, oxycarboxylic acid and salts thereof, soluble salts of sugar or zinc, and materials that delay hydraulic properties are weighed into a hydraulic material at a weight ratio of 0.1% to 2.0% and dissolved in a solvent. 2-20ppm solution is prepared, and the concentration of the solution is such that the hydrate formation can be delayed in proportion to the treatment period of the soft ground.

The sample prepared as shown in [Table 1] and the film-forming and retardant solution are sufficiently mixed and dried naturally to have a water content of 5% or less. Using the material prepared as described above to form a vertical and horizontal drainage layer on the soft ground.

The soft ground improvement mechanism by the drainage method is to improve the ground by forming a vertical and horizontal drainage layer having good water permeability in the soft ground and preloading the load corresponding to the structure to be constructed thereon as shown in FIG. 3.

Since the drainage layer maintains the permeability continuously, when the waste is formed where the drainage method is applied, the drainage layer serves as a passage for the leachate spread when the leachate leaks.

However, when the horizontal and vertical drainage layers are formed of latent hydraulic materials prepared by adjusting the particle size and adding the film forming agent and the hydroponic retarder, the initial gap is smoothly discharged at the beginning as shown in FIG. 5, and the excess gap water is discharged. The film layer gradually becomes thinner with it. As the film becomes thinner, the basic substance in the latent hydraulic fluid begins to dissolve, increasing the basicity of the pore water. When the solution shows basicity, the latent hydraulic material is stimulated to form hydrates such as calcium silicate hydrate, calcium aluminate hydrate, lime silicate and lime aluminate.

The formed hydrate gradually decreases the water permeability by gradually filling the gap between the particles of FIG. 4 to be lowered to α × 10 ⁻⁷ cm / sec or less to layer. If it is not possible to use as a repellant due to low water repellency, the basic solution is sprinkled on the drainage layer after removal of the upper ash soil so that the hydration reaction is performed.

The material whose hydrate formation is delayed with the coating and retardant solution will fully serve as a drainage layer during soft ground improvement as shown in FIG. 4, and after the role of the drainage layer is completed, will serve as a support layer and an order layer. In addition, the improved ground can also increase the bearing capacity (strength, subsidence) as well as the water repellency to prevent the spread of leachate leakage, which can create a more structurally stable and environmentally advanced landfill.

In addition, the use of latent hydraulic materials such as Busan lime, coal ash, and slag as industrial by-products actively recycles waste resources and does not use natural history to damage existing nature.

Claims (3)

Potential water hardening such as Busan lime (dehydrated cake, sediment, drag), blast furnace slag (blast furnace lump slag, blast furnace slag slag), steelmaking converter slag, steelmaking furnace slag (oxidation slag, reducing slag), fly ash, bottom ash, etc. Physical treatment of the material with a volumetric pass through No. 4 95-100%, No. 10 80-95%, No. 20 40-65%, No. 40 15-30%, No. 60 8-20%, No.100 4-10%, No.200 2-5%, with particle size, film forming effect, hydroponic effect, fatty acid, lignin sulfonic acid and its salts, oxycarboxylic acid and its salts, sugar or zinc A method for producing soft ground drainage by mixing with a solution prepared by dissolving in a solvent by soluble salts and hydraulics in a weight ratio of 0.1 to 2.0% by weight of the dry hydraulic material. A method for forming a drainage layer of the drainage method, which is a soft ground improvement method, using the material prepared according to claim 1. Using the material prepared according to claim 1 to form a vertical and horizontal drainage for the soft ground improvement of the landfill, and to use as a support pile, order layer protection and order layer after the ground improvement.