JP3309891B2 - Grout evaluation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the evaluation of the filling state of a grout material in gaps such as cracks existing in rock or ground.

[0002]

2. Description of the Related Art Conventionally, grouting materials such as cement have been injected into rocks such as curtain grouts in dams to reinforce the rocks or improve the water stopping performance. As shown in FIG. 6 (A), a large number of holes H are drilled in a rock for constructing a dam by means of a boring drill or the like, and a grout material is injected into these holes in a pressurized state.
The grout material is made to penetrate the cracks in the bedrock to improve the water stoppage. These holes are usually arranged linearly along the base length direction of the dam as shown in FIG. 6B.

In this case, it is necessary to evaluate whether or not the grout material is sufficiently injected into the gap existing in the rock. Usually, the following three methods are used for the evaluation. After injecting the grout material, check boring is performed, and the state of filling of the grout material is evaluated by observing the extracted boring core. Observe the hole wall with a borehole camera,
Evaluate the state of filling of crack with grout material. A lugeon test is performed for each predetermined section (1 m) of the borehole to create a lugeon map, and the water stoppage is evaluated based on the lugeon value. The lugion test is a method of measuring the amount of outflow when the water is injected into the section after closing both ends of the section with a packer for each predetermined section (1 m) of the borehole. The water flow rate (l / min) flowing per minute per 1 m of the pore wall under a water pressure of 10 kgf / cm2 is defined as a lugion value, and the water stoppage is evaluated by its magnitude.

[0004] Grout material is injected into the gap for the same purpose not only for the bedrock but also for the earth and sand ground.

[0005]

However, in the above-described evaluation method, it is difficult to correctly evaluate the construction because the crack, that is, the core of the grout material-filled part is often lost.

Although the above-mentioned evaluation method certainly compensates for the drawbacks of the above-described evaluation method, the color tone of the hole wall is often similar to the color tone of the grout material. It becomes difficult to correctly evaluate the filling state of the grout material. In addition, the above-described evaluation method
For each predetermined section (1 m) of the borehole, it is necessary to repeat the work of closing and injecting water with a packer and measuring the amount of effluent water.

[0007] In view of the problems of the above-described conventional evaluation methods, the present invention can accurately determine the filling state without relying on the Lugion test even when the color tone of the hole wall is similar to the color tone of the grout material. The purpose of the present invention is to provide a grout material that can be evaluated at a high speed and an evaluation method using the same.

[0008]

That is, the grout evaluation method according to claim 1 proposed by the present invention is installed in the ground to be improved.
Grout material mixed with fluorescent material
And drilling an area other than the borehole
Exposure, this exposed surface was irradiated with luminous rays and filled
Image of exposed surface taken while fluorescent light is emitted from grout material
While irradiating the exposed surface with a light beam other than the emitted light beam.
From the exposed surface and obtain these two images
Based on the difference in the total amount of cracks
By calculating the ratio of the number of cracks
It is characterized by evaluating the filling status.

The present invention proposes a graph according to claim 1.
Uto evaluation method is based on boring provided in the ground to be improved.
Inject grout material mixed with fluorescent substance into the holes,
It is separated from the ring hole by a predetermined distance and
For drilling two areas with different distances from the drilling hole
Therefore, they are exposed and the exposed surfaces are
The first and second grout materials are fluoresced while filling the grout material.
From the two images and based on the difference between these two images
To get information about the continuity and spread of cracks
It is characterized by evaluating the filling state of grout material
ing.

[0010] Then, the graph of claim 3 proposed by the present invention.
Uto evaluation method is based on boring provided in the ground to be improved.
After injecting grout containing fluorescent material into the holes,
Exposed by re-boring to enlarge the borehole
The exposed surface is illuminated with luminous rays to fill the filled
First image by photographing the exposed surface while emitting fluorescent light
And drilling in an area other than the borehole
And irradiate the exposed surface with luminous rays to fill
The exposed surface is photographed while the grout
Two images are obtained and based on the difference between these two images,
By obtaining information about the continuity and spread of cracks,
It is characterized by evaluating the filling state of grout material.
You.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Gras <br/> out material used in the embodiment of the present invention is obtained by mixing a fluorescent material grout used in such conventional ground injection. Conventional grouting materials used for ground injection include cement, water glass, clay, bentonite, and polymer grouting materials (urethane, lignin, resin, and urea).

The fluorescent substance is obtained by dissolving a fluorescent dye in a synthetic resin. Acrylic resin, vinyl chloride resin, alkyd resin, aromatic sulfonamide resin, urea resin, melamine resin, benzoguanamine resin, and copolycondensates thereof are used as the synthetic resin serving as the fluorescent dye carrier. Fluorescent dyes emit light when irradiated with visible light, ultraviolet light, infrared light, etc.Fluorescent dyes emitting light with visible light include aqueous solutions such as fluorescein, eosin, and esculin, solids such as canary glass and platinum soanide. Are known. Fluorescent dyes that emit ultraviolet light include bis (benzoxazolyl) ethylene, bisthiophene, N-naphthalic acid-N-substituted imide, stilbene, coumarin, and the like.

If the grout material is used, the rock mass is exposed after filling, and illuminating light such as ultraviolet rays is irradiated to emit a fluorescent substance that has penetrated into gaps such as cracks. be able to.

An embodiment of an evaluation method according to the present invention will be described with reference to FIG. 1 showing an example of a curtain grouting work. First, a boring hole 1 is pierced by a boring boring machine in the ground to be improved or in the ground of earth and sand. Fill and fill the ground with.

Next, in order to expose the ground, a separate boring hole 2 is provided within the expected pouring range, and the wall surface of the boring hole 2 is irradiated with ultraviolet light as a luminous ray. The grout material emits fluorescent light. In this state, for example, only the crack 3 in which the grout material has penetrated is recognized as shown in FIG. If this state is photographed and observed by means such as a borehole camera, it is possible to evaluate the filling state of the grout material in the ground. When the boring holes 2 are drilled near the boundary of the planned injection range of the adjacent grouting hole for grouting material, the filling state of the grouting material injected from the three surrounding holes can be efficiently observed.

[0016] claimed in the embodiment of the evaluation method of claim 1, wherein the boring an image obtained by photographing the hole 2 of the hole wall grout filled by irradiating ultraviolet rays in fluorescence emission is allowed while borehole camera first The image is recorded on the image processing apparatus. In the first image, only a portion that emits fluorescence is photographed. That is, as shown in FIG. 2A, only the crack 3 in which the grout material has penetrated is photographed.

Next, an image of the hole wall obtained by photographing with a borehole camera in the same manner as described above while irradiating the hole wall of the borehole 2 with light other than the emitted light, for example, visible light, is recorded as a second image. I do. In the second image, as shown in FIG. 2B, a crack 4 in which the grout material has not penetrated is photographed together with the crack 3. In FIG. 2B, the ground is photographed together with the crack 4. If a fluorescent dye that emits visible light is also mixed into the grout material, the crack 3 that emits visible light, that is, the crack 3 that is filled with the grout material and the crack 4 that does not emit light in the same image are clearly defined. Can be distinguished. Then, the filling rate can be obtained by one photographing.

Next, by comparing and observing the difference between the first image and the second image, it is possible to accurately evaluate the filling state of the grout material. That is, the closer the state of the crack 3 in the first image to the state of the crack 4 in the second image, the higher the filling state can be evaluated. Further, crack 4 in the second image
The ratio of the total amount of cracks 3 in the first image to the total amount of
An index indicating the filling state of the grout material into the cracks in the region and the filling rate can be indicated by numerical values for accurate judgment. Note that the total amount of these cracks can be easily measured by image processing and quantified.

As shown in FIG. 3, the embodiment of the evaluation method according to the second aspect is that the second and third locations are separated from each other by a predetermined distance apart from the boring hole 1 into which the grout material is injected. The first and second images ((A) and (B) of FIG. 4) obtained by providing the boring holes 5 and 6 and irradiating the walls of these holes with ultraviolet rays as emission light rays are compared. It is characterized by evaluating the filling state of the grout material.

That is, if the total amount of cracks in the third boring hole 6 is smaller than the total amount of cracks in the image of the second boring hole 5 which is closer to the first boring hole 1, the boring hole 5 is moved from the injection hole side. It can be evaluated that the permeability of the grout material to the side is poor. Further, by observing the state of cracks on the wall surface of the bored hole at a predetermined distance from the injected rock, information on the continuity and spread of the cracks can be obtained. Furthermore, by grasping the correlation between the above-mentioned filling rate and permeability and the ludione value or the grade of the rock mass obtained by a separate method, it is possible to efficiently evaluate the waterproofness and the grade of the rock mass.

As an embodiment of the evaluation method of the third aspect, a hole provided by enlarging and re-boring the first boring hole 1 in FIG. 3 is referred to as a second boring hole 5 '. The image obtained at the third boring hole 6 is used as the first image, and the image obtained at the third boring hole 6 is used as the second image. By expanding and reboring in this way, the grout material attached to the hole wall at the time of injection is cut off to expose the rock surface, and it is not necessary to newly drill a drilling hole for evaluation. It is possible to accurately compare the injection situation with other evaluation boring holes.

Since the image of the borehole camera in the above description is a set of annular images obtained by cutting the image of the cylindrical hole wall into a predetermined width, FIG.
The image processing apparatus shown in FIG. 1 develops a ring image into a linear image to obtain a planar image. An example of such an image processing method and apparatus is disclosed in Japanese Patent Publication No. 7-15383.
It is preferable to use the technology disclosed in Japanese Unexamined Patent Application Publication No. 2000-125, etc.

When a fluorescent substance that emits visible light is used, an image can be taken with an imaging means such as a borehole camera using a normal CCD sensor. However, when a fluorescent substance that emits light in the ultraviolet or infrared region is used. It is preferable to use imaging means capable of detecting those areas. The form of the fluorescent substance may be powder or liquid, but the fluorescent substance in a liquid state is easier to mix with the grout material.

[0024]

According to the grout evaluation method of the present invention , the firefly
Since the permeated fluorescent substance is emitted by the emitted light using the grout material mixed with the light substance, it is possible to clearly confirm the gap of the color tone which is difficult to visually recognize, and to accurately evaluate the filling state. In addition , since the ground into which the grout material mixed with the fluorescent material is injected is exposed and emitted light is emitted, it is possible to accurately evaluate the filling state of the grout material by the fluorescent material penetrating the cracks in the ground.

Further, when the ground is exposed by boring, the ground is easily exposed for observing the filling state. In addition, the state of the hole wall can be recorded by using a borehole camera, and further advanced evaluation can be performed by image processing. Further, by comparing an image irradiated with visible light and an image irradiated with light-emitting light, a filling state such as a filling ratio can be grasped and accurate evaluation can be performed.

In addition, by comparing images obtained by irradiating emitted light beams in two boring holes provided in places other than the holes into which the grout material is injected, it is possible to accurately evaluate a filling state such as a filling ratio between the two places. Can be. In addition, the number of boring holes drilled in the ground can be reduced by comparing the image of the hole into which the grout material has been injected with the enlarged and re-bored hole and the image of the two boring holes of another boring hole. Furthermore, the comparison between the injection point and the injection state of the other boring holes for evaluation can be accurately performed.

[Brief description of the drawings]

FIG. 1 is a view showing an arrangement of boring holes for explaining an evaluation method according to the present invention.

FIG. 2 is a diagram illustrating a state of a hole wall of a boring hole according to the present invention.

FIG. 3 is a diagram showing an arrangement of boring holes for explaining an evaluation method according to the present invention.

FIG. 4 is a diagram illustrating a state of a hole wall of a boring hole according to the present invention.

FIG. 5 is a block diagram illustrating an example of an image processing apparatus used in the present invention.

FIG. 6 is a diagram illustrating a curtain grouting work in dam construction to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boring hole 2 Boring hole 3 Crack seen by fluorescence 4 Crack seen by visible light 5 2nd boring hole 5 '2nd boring hole by magnifying re-boring 6 3rd boring hole

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Hagimori 2-2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura Gumi Co., Ltd. (56) References JP-A-3-132590 (JP, A) JP-A-7 JP-A-53-83307 (JP, A) JP-A-7-180136 (JP, A) JP-B-48-33081 (JP, B1) JP-B-7-15383 (JP, B2) ) Journal of Japan Society of Natural Resources and Materials, Vol. 106, No. 10, 573-579 Applied Geology, Japan, Vol. 36, No. 6, 46-51 (58) Fields surveyed (Int. Cl. ⁷ , DB name) E02D 3/12 101 C09K 17/14 C09K 17/18 C09K 17/20 C09K 103: 00

Claims (3)

(57) [Claims] 1. A injecting grout obtained by mixing a fluorescent substance into boreholes provided in the ground improvement subject is exposed by excavation to another area from said borehole, the emission light on the exposed surface Obtaining an image of the exposed surface while irradiating the filled grout material with fluorescent light and an image of the exposed surface while irradiating the exposed surface with light other than the emitted light beam, these two images The grout evaluation method characterized by evaluating the filling state of the grout material by obtaining the ratio of the number of cracks permeated by the grout material to the total amount of cracks based on the difference between the cracks. 2. A grout material mixed with a fluorescent substance is injected into a boring hole provided in the ground to be improved, and is separated from the boring hole by a predetermined distance and at two different locations from the boring hole. Area is exposed by excavation or the like, and the exposed surface is irradiated with a luminous ray to fluoresce the filled grout material to obtain first and second two images, and the difference between these two images is obtained. On the basis of the,
A grout evaluation method characterized by evaluating a filling state of a grout material by obtaining information on continuity and spread of a crack. 3. A grout material mixed with a fluorescent substance is injected into a boring hole provided in the ground to be improved, and the boring hole is exposed by expanding and re-boring, and the exposed surface is irradiated with a luminescent ray. An exposed surface is photographed while the filled grout material emits fluorescent light to obtain a first image, a region other than the boring hole is exposed by excavation or the like, and the exposed surface is irradiated with a light beam. A second image is obtained by photographing the exposed surface while causing the filled grout material to emit fluorescent light, and based on the difference between these two images, information on the continuity and spread of the crack is obtained. A grout evaluation method characterized by evaluating a filling state.