JPH11228961A - Soil sealing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soil sealing material which can easily increase the supporting power of a sealing layer while effectively utilizing molten slag without sampling or purchasing gravel by mixing molten slag into a soil sealing material used for forming a sealing layer from on-site produced soil. SOLUTION: For example, silt or fine clay granules can be used as a soil sealing material, and in the case of soil mainly comprising water-permeable sand, it can be converted into a soil sealing material by mixing bentonite into it. For example, molten slag produced in incinerating household wastes at 1,300-1,500 deg.C, a molten slag obtd. in melting incineration ash with a direct- current electromelting furnace, etc., are solidified by air-cooling or water-cooling and then used as the molten slag. The molten slag is crushed to a size of 40-50 mm and is mixed in an amt. of 30-40% into the objective sealing material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil impermeable material,
In particular, the present invention relates to a soil impermeable material used to form a water impermeable layer using locally generated soil.

[0002]

2. Description of the Related Art For example, a water-impervious wall for preventing water stored in a dam from penetrating and flowing out of an embankment is provided on a core portion of a fill dam. It is formed by In addition, in reservoirs and landfill-type waste disposal sites, a water-blocking layer is formed on the bottom to store stored water or to prevent contaminated water leaching from waste from flowing out. Being formed,
In particular, at a waste disposal site, a water barrier layer that prevents rainwater and the like from penetrating into the waste may be laid as covering soil covering the waste.

[0003] These water-blocking layers are formed of a soil material having water-blocking properties. When the locally generated soil contains a sufficient amount of silt or clay fine particles, the generated soil is wound. When the soil generated is locally soil-based,
For example, it is common to form a water-blocking layer by adding bentonite to a material having sufficient water-blocking properties and then compacting it.

[0004] When a considerable bearing capacity is required for these impermeable layers, gravel is mixed into these soil impermeable materials to increase the supporting capacity.

[0005]

When the gravel layer is included in the locally generated soil, the generated gravel is classified using a sieve or the like, and the gravel mixed into the soil impermeable material is classified as a gravel. Can be taken out and used, but there is a problem that such a work requires large-scale equipment and cost.

Another problem is that if the generated soil contains no gravel, it is necessary to separately purchase gravel to be mixed into the soil impermeable material.

On the other hand, at present, most of the large amount of garbage generated daily is incinerated in Japan. However, dioxin generated during incineration is a major social problem, and incineration is required to prevent the generation of dioxin. Temperature between 1300 and 15
It is expected that the number of processing methods up to 00 degrees will increase in the future. Incineration of refuse at elevated temperatures will produce vitreous molten slag. In addition, incineration ash due to garbage or coal can be melt-processed using, for example, a direct current electric reduction melting furnace or the like, but such a melting process also generates a large amount of molten slag. In addition, by electrically heating the contaminated soil in situ,
Technology to collect and remove by vitrification has also been developed,
The solidified matter thus recovered and removed also contains a large amount of molten slag.

[0008] Such molten slag has been tried to be used, for example, as an aggregate for concrete or a roadbed material. However, in order to effectively utilize such molten slag, it is desired to develop another use. ing.

Accordingly, the present invention has been made in view of such a conventional problem, and does not extract or purchase gravel, and effectively utilizes molten slag to support a water-impervious layer. It is an object of the present invention to provide a soil impermeable material capable of easily increasing the force.

[0010]

Means for Solving the Problems The present invention has been made to achieve the above object, and the gist of the present invention is to provide a soil impermeable material used for forming a impermeable layer using locally generated soil. In addition, in the soil impermeable material, a molten slag for increasing a supporting force of the impermeable layer is mixed with the soil impermeable material.

Here, in the above description, the soil impermeable material is a soil material capable of forming a water impermeable layer that blocks the passage of water by forming a layer or wall having a predetermined thickness. Silt or clay fine particles can be used, and even in the case of soil mainly composed of permeable sand, for example, by adding bentonite to improve the soil, It can be a water-blocking material.

Further, the molten slag mixed with the soil impermeable material is mainly composed of ash when burning garbage or coal.
It is mainly composed of silicate. For example, molten slag and incinerated ash generated when garbage generated every day is heated to 1300 to 1500 ° C to incinerate the garbage, and incinerated ash is melted using a DC electric melting furnace or the like. The molten slag or the like obtained at the time of solidification can be used after being solidified by air cooling or water cooling.

[0013] Such a molten slag is carried to the work site of the impermeable layer in a state where the slag is crushed to a size of, for example, about 40 to 50 mm and adjusted, and is subjected to soil impermeable material by locally generated soil. Will be mixed in.

That is, the molten slag is used as a substitute for the gravel mixed in the soil impermeable material to increase the bearing capacity of the impermeable layer by using various mixing devices in the same manner as the conventional gravel. At a mixing rate of about 30 to 40% (the ratio of the amount of slag to the total dry soil weight) in the soil impermeable material,
The mixed molten slag forms a skeleton in the soil impermeable material, and gives the impermeable layer made of the soil impermeable material a substantial ground support equivalent to that of the soil impermeable material mixed with gravel. become.

Further, it is possible to effectively utilize molten slag which is expected to be generated in a large amount in the future, and to reduce costs by using molten slag to be disposed of. .

Therefore, according to the soil impermeable material of the present invention, it is possible to easily increase the bearing capacity of the impermeable layer without extracting or purchasing gravel, and effectively using the molten slag. it can.

[0017]

As described above in detail, according to the soil impermeable material of the present invention, since molten slag is mixed, the molten slag can be effectively used without extracting or purchasing gravel. While utilizing, it is possible to easily increase the supporting force of the impermeable layer formed by the soil impermeable material.

Claims (1)

[Claims] 1. A soil impermeable material used to form a water impermeable layer using locally generated soil, wherein the soil impermeable material is mixed with a molten slag for increasing a supporting force of the water impermeable layer. Soil impervious material characterized by being made.