JPS61257534A - Slope stabilization work - Google Patents

Abstract

PURPOSE:To simplify the stabilization work of slope by a method in which a liquid soil stabilizer having a consistency and a coagulating property is spread over a slope, a fibrous reinforcing material is spread on the soil stabilizer before it is hardened, and the liquid soil stabilizer is again spread over them. CONSTITUTION:A liquid soil stabilizer having a consistency and a coagulating property, e.g., a mixture of cement milk and methyl cellulose, etc., is spread or sprayed onto a slope. A fibrous reinforcing material of a fiber diameter of 0.2-1mm and a fiber length of 1-10cm, e.g., steel fiber, etc., is spread or sprayed onto the soil stabilizer, and the liquid soil stabilizer is again spread or sprayed onto them. Small-scale construction work can thus be simply performed without use of large-scale machinery.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a slope stabilization method for preventing slope collapse with simple construction.

Problems to be Solved by the Invention There is a construction method in which concrete or mortar is sprayed onto a slope in order to stabilize the slope. This method is used for conch IJ
- It is expected to have the strength of mortar and mortar, and is suitable for large-scale construction, but is unsuitable for small-scale construction because the machine cost is too high. In addition, cement-based solidifying materials are strong in compression but weak in tension, and slope collapse is mainly caused by
This occurs in the form of upheaval on the slope, which causes tensile strain on concrete, making it more likely to crack due to such force.

In addition, there is a construction method in which fibrous reinforcing materials such as glass fiber and steel fiber are mixed into concrete and mortar to give the fibrous reinforcing material tensile force and thereby effectively withstand slope collapse. However, it is mechanically expensive due to the inclusion of fibrous reinforcing material, making it particularly unsuitable for small-scale construction.

Means for Solving the Problems The slope stabilization method according to the present invention involves spraying or spraying a viscous and coagulable liquid soil improving material onto a slope, and adding liquid soil improving material to the slope before the liquid soil improving material hardens. By scattering or spraying the fibrous reinforcing material on the improvement material, and again scattering or spraying the liquid soil conditioner on the fibrous reinforcing material,
The purpose is to enable easy construction without using large-scale machinery, and to increase tensile strength to effectively withstand slope collapse.

Example The present invention will be described in detail below based on Examples.

This invention involves spraying or spraying a liquid soil conditioner having viscosity and coagulability on a slope, and spraying or spraying a fibrous reinforcing material on the liquid soil conditioner before the liquid soil conditioner hardens. The liquid soil conditioner is again sprinkled or sprayed onto the fibrous reinforcing material.

Soil improvement materials have water permeability and are usually infiltrated into the ground by pressure injection to improve the ground. When it is soaked, only the moisture penetrates into the ground, leaving only cement particles and fine aggregate on the ground surface, and even when it solidifies, it does not adhere well to the ground.

The soil conditioner used in this invention has both cohesion and viscosity. Even when a viscous soil conditioner is sprinkled or sprayed onto the ground, it does not penetrate into the ground beyond the level at which the particles retain water. Therefore, when it solidifies, it adheres very well to the ground. Furthermore, when the fibrous reinforcing material is spread or sprayed onto the soil improving material, the fibrous reinforcing material remains on the soil improving material due to its viscosity and becomes intertwined.

The following soil conditioners exist:

■ Cement milk + methyl cellulose @ Cement milk + Sodium alginate〇 Polymer emulsion (
Acrylic acid ester, vinyl acetate, synthetic rubber, etc.) Hardening material (epoxy resin) or cement ■ Asphalt emulsion + Water-soluble polymer solution of hardening material (polyvinyl alcohol mixed with boric acid, etc.) Hardening material e Acidic Water glass sol + thickener (methyl cellulose, etc.) When the soil improving material with the above composition is sprayed or sprayed onto the ground, the particle size will penetrate into the ground and improve the ground, and the rest will be released onto the ground surface. The remaining solidifies and has the effect of increasing the strength of the ground surface and lowering the hydraulic conductivity.

The fibrous reinforcement must be easy to spread and at the same time have good interlocking properties. The fibrous reinforcement has a high tensile elastic modulus, and its shape is such that the fiber diameter is between 0.2 and 1 and the fiber length is between 1 and 1.
0crIL is preferred.

The following can be considered as fibrous reinforcing materials.

■ Steel @ Alkali-resistant glass θ Carbon ○ Asbestos ■ Polyester θ Aluminum Of these, asbestos and glass are easily blown away by the wind when sprayed, and carbon is expensive.

Therefore, steel, aluminum and polyethylene are preferred.

In addition, in the case of mechanical agitation, lengths of 5 cIIL or less are often used, but in the case of manual spraying, lengths are not a problem, and if they are too long, they protrude on the sprayed surface and become unsightly, so 10 cIIL or less is used. Preferably.

Next, an experimental example will be described.

<Experiment example 1> The soil conditioner was used in the following formulation.

Asphalt emulsion 26.5 Kg Ultra fast hardening cement 350 ~ Fly ash 710 Kf water
360 to 4 cure retarder
1.6 Kf of these were mixed and sprayed onto a fragile slope containing weathered andesite using a submersible pump. The viscosity of the soil conditioner was s,ooo~10,000Cp.

The spraying was carried out at a rate of 0.02 to 0.04 m'/m2. Immediately, a steel fibrous reinforcing material with a diameter of Q, 4 m, and a length of about 5 cIL was scattered and adhered to the soil conditioner. Most of the fibrous reinforcement is deposited on the modified material;
There was very little that fell down. The amount of fibrous reinforcement applied was approximately IKf/m2.

After construction, the fibrous reinforcement material blended well with the soil improvement material, and no peeling of the improvement material occurred.

Experimental Example 2> Methyl cellulose was added to silica sol (non-alkaline) as a soil conditioner, and the viscosity was adjusted to 3,000-s, o o o.
The one adjusted to cp was used.

This soil conditioner was spread on a sandy slope with an inclination of approximately 25 degrees.

The amount of spraying was approximately 0.02 m5/m2.

Immediately after spraying, the diameter is 0.4 and the length is 7c! Steel fiber, which is a fibrous reinforcing material of IL grade, was spread by hand. The fibers fell to the bottom slightly, but most of them were attached to the improved material.

After the fibers were spread, the soil conditioner was sprayed again when the soil conditioner that had already been sprayed had solidified a little. The amount of spraying is approximately 0.02 m'/m'. During the second application, the improved material from the first application had already begun to set, so there was not much penetration.

After construction, a strong composite of solidified silica sol and steel fibers was formed on the ground surface.

Experimental Example 3 As the soil conditioner, cement milk mixed with methylcellulose as a thickener was used. Three types of cement milk were used with water-cement ratios of 45 and 55.60%.

The viscosity of milk is 4,000~s, o o o cp
It was adjusted so that

This soil conditioner was spread on a sandy slope with an inclination angle of about 25 degrees. When the water-cement ratio was 55 inches and 60 inches, breathing occurred and the sandy slope loosened a little after spraying due to the large amount of seepage water.

In the case of cement milk with a water-cement ratio of 45%, the cement remains on the slope surface, making it very strong. Also, because of its viscosity, steel fibers adhered well. However, since it takes time for the concrete to solidify, when the sandy ground deforms, the effectiveness of the fibers decreases and separation of the mortar from the sand surface occurs.

Effects of the invention - As described above, this invention sprays or sprays a soil improving material with viscosity and coagulation, so that some of the water permeates into the ground and some of the water is retained by the particles, resulting in extremely high water content. It adheres well and reduces the chance of the fibrous reinforcing material falling downward.
A good solidified body can be constructed.

The fibrous reinforcement can be rolled by hand, has low mechanical costs, and is easy to construct.

Claims (1)

[Claims] Spraying or spraying a liquid soil conditioner with viscosity and coagulability on a slope, and spreading or spraying a fibrous reinforcing material on the liquid soil conditioner before the liquid soil conditioner hardens. A slope stabilization method characterized by spraying or spraying a liquid soil conditioner onto the material again to prevent the slope from collapsing.