JP3030604B2 - Inside slope structure of waste disposal site - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner slope structure of a waste disposal site, and more particularly to an inner slope structure of a waste disposal site suitable for an inner slope of an industrial waste disposal site.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show an inner slope of a conventional industrial waste disposal site. The inner slope of FIG. 9 is obtained by a rubber sheeting method. The slope of the ground 1 formed by excavation rolling is covered with a nonwoven fabric 9, and a rubber sheet 8 is further provided thereon as a water sealing layer. The upper edges of the rubber sheet 8 and the nonwoven fabric 9 are fixed underground by concrete 10. The inside slope of FIG. 10 is formed by a rubber asphalt spraying method, and the slope of the ground 1 is covered with a nonwoven fabric 9a, and rubber asphalt 8a is sprayed thereon as a sealing layer, and the rubber asphalt 8a and the nonwoven fabric 9a are formed in the same manner as in FIG.
Is fixed underground by the fixed soil 10a. As described above, in the conventional industrial waste disposal site, the waste liquid and the like leached from the waste 11 stored in the disposal site are prevented from diffusing into the ground by the rubber sheet 8 or the rubber asphalt 8a.

[0003]

In the above-mentioned conventional waste disposal site, holes are easily formed in the rubber sheet 8 or the rubber asphalt 8a as a water sealing layer during construction and during use after completion. There is a problem that the repair is practically difficult and is likely to cause social conflict. In other words, in the rubber sheet upholstery structure as shown in FIG. 9, a rubber sheet 8 that conforms to JIS6008A with a thickness of 1.5 mm is usually used from the viewpoint of workability. This JIS standard specifies the strength itself as a rubber sheet. However, when it is actually used as a sealing layer in a waste disposal site, the following problems occur. That is, when the waste is buried in the disposal site after completion, some of the waste has a shape and hardness that can easily pierce the rubber sheet 8, and these may be thrown, The rubber sheet 8 is pressed into the rubber sheet 8 by landfill pressure.
A puncture or tearing occurs. Further, it is practically inevitable that the rubber sheet 8 is damaged by the heavy pressing machine itself during the landfill operation. In addition, the occurrence of pinholes caused by birds and birds such as crows and tombs is inevitable. These damages to the rubber sheet 8 cause the harmful liquid exuding from the waste to penetrate into the ground, and cause environmental pollution. Therefore, it is necessary to constantly detect and repair these damages. However, these damages are virtually impossible to detect and repair because they are buried beneath the landfill waste. In addition, the occurrence of pinholes caused by birds and birds, which occur irregularly on a daily basis, can hardly catch up with inspection and repair. On the other hand, in the rubber asphalt spraying structure as shown in FIG. 10, the spraying method is used, so that the construction is easy. It may penetrate the asphalt 8a and the nonwoven fabric 9a.

In order to maximize the waste storage capacity of a disposal site under a given land area, it is necessary to make the slope of the inner slope as large as possible. However, since the sheet-like rubber material has poor adhesion to the soil, it is necessary to reduce the slope of the slope and to avoid a complicated slope shape. Therefore, there is also a problem that the capacity for storing waste is limited.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by providing a slope structure inside a waste disposal site inside a waste disposal site in which a soil layer structure is closely stacked on the slope portion. A slope structure, wherein the soil layer structure is provided with a geotextile on a lower surface of an impermeable soil layer in which bentonite is mixed at about 10% by weight, and a slope of the impermeable soil layer is formed by a light weight frame and a light weight frame thereof; It was configured as being covered by a water-drainage prevention mat installed inside the. More specifically,
The non-woven fabric is provided on the slope of the ground or the slope is left as the slope of the ground.

[0006]

[Action] impermeable soil layer is a mixed soil which is mixed to about 10% by weight of bentonite, permeability has the following impermeable 1 × 10- ⁷ cm / sec. The geotextile is a net-like or lattice-like sheet-like material, and functions as a reinforcing and stabilizing aid for maintaining the function of the water-impermeable soil layer. The lightweight slope is a slope frame made of expanded metal, which prevents the impermeable soil layer from being eroded by rainwater, etc., and contributes to the formation and maintenance of the soil layer structure. Make it possible. The drainage prevention mat is a non-woven fabric that is used in combination with a lightweight method frame to prevent the impermeable soil layer from being eroded by rainwater, etc., and to contribute to the formation and maintenance of the soil layer structure. Is possible. The nonwoven fabric installed on the slope of the ground has a function of treating spring water from the ground. The above-described impermeable soil layer, geotextile, lightweight frame, water-drainage prevention mat, and nonwoven fabric installed on the slope of the ground interact with each other to produce a synergistic effect, and have a steep slope having water-impermeable properties. Enables the formation and maintenance of slopes.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a vertical sectional structure of an inner wall portion of a waste disposal site of the present embodiment. In the figure, 1 is a ground pile, 2 is a water-impermeable soil layer, 3 is a geotextile, 4 is a drainage prevention mat, 5 is a lightweight frame, 6 is a nonwoven fabric, and 7 is an oblique tie rod. Ground Mountain 1
Is an excavated compacted rock having a vertical height of 5.0 meters and a gradient of 1: 0.5, and has a specific gravity (γt) = 1.8 t / m ³ and an internal friction angle (φ ) = 35
°, standard penetration test value (N value) ≧ 10 is adopted. Impermeable soil layer 2 is a mixed soil which bentonite mixed about 10 percent by weight, and the mixed soil is hydraulic conductivity has a 1 × 10- ⁷ cm / sec or less impermeable performance as shown in FIG. Bentonite is a naturally formed clay produced by sedimentation originating from a volcanic eruption several hundred years to about 200 million years ago through geochemical alteration, and is mainly composed of the clay mineral montmorillonite. Montmorillonite is a silicate mineral, Si,
Atoms and ions such as O, Al, and OH are main constituent elements, and Na, K, Ca, Mg, and water molecules are added thereto to form a skeleton, and have excellent water sealing performance.

[0008] Geotextile 3 is the Japanese
As shown in Japanese Patent Publication No. 60, it is a net-like or lattice-shaped sheet product in which polymer molecules are aligned in a certain direction by thermally stretching polyethylene, and is light, has excellent chemical resistance, and has a strength level comparable to mild steel. In addition, an interlock effect in which soil particles are restrained in the mesh structure in the soil and an effect of reinforcing and stabilizing the embankment by the resistance force when the mesh structure is pulled out from the soil are exhibited. FIGS. 4 to 6 show schematic plan views of the structure. The portion painted black is the hot stretched sheet portion of the polymer molecule. In this embodiment, these geotextiles are used as reinforcing and stabilizing aids for maintaining the function of the water-impermeable soil layer 2. In the stability calculation of the embankment layer using the geotextile, it is usually assumed that the adhesive strength (C) of the soil itself is 0 t / m ^2. However, since the geotextile to which the geotextile is applied in the present embodiment is clayey, the adhesive strength C is considerably high. Has a value. Therefore, geotextile 3
Contributes greatly to the stable maintenance of the function of the water-impermeable soil layer 2 by synergistic action with the adhesive strength of the water-impermeable soil layer 2.

The drainage prevention mat 4 is a non-woven fabric formed by forming fibers into a sheet by a method such as adhesive, hot pressing, mechanical bonding, or the like. It is used to prevent erosion and maintain the formation of the embankment slope. The lightweight profile frame 5 is a slope frame using expanded metal, and is used for construction of a retaining wall as shown in JP-B-63-11488. However, in the present invention, the lightweight frame 5 is used for stabilizing the surface of the impermeable soil layer 2 of the soil layer structure 2a. FIG. 7 shows a perspective view of the structure of the light weight frame 5. The nonwoven fabric 6 (FIG. 1) has a thickness of 10 mm and has a function of treating spring water from the ground 1.

As shown in FIG. 1, the inner slope of the disposal site has a water-impermeable soil layer 2, a geotextile 3, a drainage prevention mat 4, and a lightweight slope frame 5, each of which has one soil layer structure 2 a. And several layers are sequentially stacked so as to conform to the shape of the ground 1 formed in a steep stepwise shape. FIG. 2 is an enlarged sectional view of one soil layer structure 2a. In this embodiment, a disposal site is constructed by stacking four horizontal soil layers 2a each having a thickness of 1.5 meters in three stages at a gradient of 1: 0.5. Not limited to this number. FIG. 8 shows a vertical cross section in a state where four soil layer structures 2a are stacked in one stage. As shown in FIG. 1, the uppermost layer of each stage and the lowermost layer of the stage above it are adjacent to each other and integrally form an impermeable layer. The inside slope structure of the present invention may be applied to a pool, a fishing pond, a pond such as a golf course, and the like. In the above-described embodiment, as shown in FIGS.
Although the nonwoven fabric 6 is provided on the slope of (1) and has a function of treating the spring from the ground 1, the nonwoven fabric 6 may not be used depending on the conditions of the ground.

[0011]

Since the present invention is configured as described above, the following remarkable effects can be obtained. 1) It is possible to construct a waste disposal site having substantially semi-permanent life and substantially complete water impermeability without being penetrated by solid waste or the like. For this reason, environmental pollution around the waste disposal site can be almost completely prevented, and a great sense of security can be given to the local residents. This can avoid unnecessary disputes with local residents regarding the construction of waste disposal sites. 2) Steep slope construction is possible, and the capacity of the waste disposal site can be significantly increased, contributing significantly to solving environmental problems. 3) By using a mixed soil containing about 10% by weight of bentonite as an impermeable soil layer, the permeability coefficient is 1 × 10 −
It is possible to provide a waste disposal site with water impermeability of ⁷ cm / sec or less. 4) By installing the geotextile on the lower surface of the water-impermeable soil layer, the function of the water-impermeable soil layer can be reinforced and stabilized. 5) By using a lightweight frame and a mat for preventing water leakage,
Erosion of the impermeable soil layer by rainwater is prevented,
Steep slope construction is possible. 6) If a nonwoven fabric is installed on the slope of the ground, the spring water from the ground can be effectively treated.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing the entire structure of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of one soil structure.

FIG. 3 is a diagram showing a relationship between a bentonite mixture ratio and a hydraulic conductivity.

FIG. 4 is a schematic structural diagram of a geotextile.

FIG. 5 is a schematic structural diagram of a geotextile.

FIG. 6 is a schematic structural diagram of a geotextile.

FIG. 7 is a perspective view of a lightweight legal frame.

FIG. 8 is a partial cross-sectional view of a laminated structure.

FIG. 9 shows a conventional waterproof structure with a rubber sheeting configuration.

FIG. 10 shows a conventional waterproof structure using a rubber asphalt spraying structure.

[Explanation of symbols]

 Reference Signs List 1 ground mountain 2 impermeable soil layer 2a soil layer structure 3 geotextile 4 water outflow prevention mat 5 lightweight legal frame 6 non-woven fabric 7 diagonal tie rod

Claims (3)

(57) [Claims] 1. An inner slope structure of a waste disposal site in which a soil structure is closely stacked on a slope portion, wherein the soil structure is formed of an impermeable soil layer containing about 10% by weight of bentonite. A geotextile is installed on the lower surface, and the slope of the water-impermeable soil layer is covered by a light-weighted screed and a water-drain prevention mat installed inside the light-weighted screed. Slope structure. 2. The slope structure of a waste disposal site according to claim 1, wherein the slope portion of claim 1 is provided with a nonwoven fabric on a slope of a ground. 3. The inner slope structure of the waste disposal site according to claim 1, wherein the slope portion of claim 1 remains a slope of a ground.