JP3913616B2 - Damage detection system for vertical impermeable walls, and damage detection method for vertical impermeable walls - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique used to detect whether or not the vertical impermeable wall is damaged and where it is in a waste disposal site surrounded by a vertical impermeable wall embedded in a vertical direction.
[0002]
[Prior art]
In a waste disposal site, since it is necessary to prevent the outflow of sewage to the outside, it is common to arrange a water shielding sheet on the concave surface of the waste disposal site. However, a waste disposal site created in an era when the problem about the outflow of sewage was not recognized so strongly does not have the above-described water shielding sheet.
In such a waste disposal site, in order to prevent the outflow of sewage, a vertical impermeable wall is often provided.
[0003]
The vertical impermeable wall is a wall embedded in the vertical direction so as to surround the waste disposal site. This is formed, for example, as a vertical water-impervious sheet by a resinous sheet, or as a steel sheet pile wall, a soil cement solidified wall, an underground continuous wall, or a grout wall.
In any case, the vertical impermeable wall is discarded by the vertical impermeable wall and the impermeable layer by burying the material forming the wall so that the lower end reaches the impermeable layer such as a clay layer, for example. It surrounds the landfill and prevents sewage from flowing out.
[0004]
In such a waste disposal site with a vertical impermeable wall, the vertical impermeable wall is not allowed to be damaged. If this happens, the occurrence of the damage is quickly detected and It is necessary to repair it quickly.
[0005]
From such a point of view, in a waste disposal site where a vertical impermeable wall is arranged, a system for detecting breakage of the vertical impermeable wall is necessary, but there is no technology intended for it.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a technique for detecting breakage of a vertical impermeable wall that enables detection of a breakage position of the vertical impermeable wall.
[0007]
[Means for Solving the Problems]
The invention proposed in order to solve this problem is as follows.
The present invention is a breakage detection system for a vertical impermeable wall that detects the presence and location of the vertical impermeable wall in a waste disposal site surrounded by vertical impermeable walls embedded in a vertical direction.
The breakage detection system is in contact with soil, and is provided with a plurality of external detection electrodes arranged at predetermined positions outside the vertical impermeable wall, one of these external detection electrodes, and the other. An external detection means for detecting a specific resistance distribution in a vertical plane including the external detection electrode, and from the specific resistance distribution detected by the external detection means, the presence or absence of breakage of the vertical impermeable wall, And the place is detected.
In the present invention, the state of the vertical plane inside the soil is detected by using the detection of the specific resistance distribution as described above, and based on this, the presence or absence of breakage of the vertical impermeable wall is detected. If the specific resistance distribution is used, the position of the vertical impermeable wall breakage can be detected. Further, not only this, but also continuous monitoring allows real-time detection of vertical impermeable wall breakage.
[0008]
The breakage detection system for a vertical impermeable wall according to the present invention includes the external detection electrode and the external detection means as described above. In addition to this, a plurality of internal detection electrodes arranged in contact with the soil and arranged at predetermined positions inside the vertical impermeable wall, one of these internal detection electrodes, and the other And an internal detection means for detecting a specific resistance distribution in a vertical plane including the internal detection electrode. In this case, the presence / absence and location of the vertical impermeable wall can be detected from the specific resistance distribution detected by the external detection means and the internal detection means.
In this way, by using the specific resistance distribution inside and outside the vertical impermeable wall, it is possible to more accurately detect whether or not the vertical impermeable wall is damaged and where.
[0009]
As described above, the external detection means is configured to detect the specific resistance distribution in the vertical plane including the two external detection electrodes.
The combination of the two external detection electrodes that determine the vertical plane on which the resistivity distribution is measured may be fixed, but the external detection means of the present invention selects and selects any two external detection electrodes. The specific resistance distribution in the vertical plane including the two external detection electrodes may be detected. In this way, the specific resistance distribution corresponding to the number of combinations of the number of external detection electrodes can be measured, so that the presence / absence and location of the vertical impermeable wall can be detected more accurately.
As described above, the external detection means is configured to detect the specific resistance distribution in the vertical plane including the two external detection electrodes.
This situation also applies to the internal detection electrodes and the internal detection means.
That is, the combination of the two internal detection electrodes that determine the vertical plane in which the resistivity distribution is measured may be fixed, but the internal detection means of the present invention selects any two internal detection electrodes, The specific resistance distribution in the vertical plane including the two selected internal detection electrodes may be detected.
[0010]
As described above, the external detection electrode and the internal detection electrode are arranged so as to be in contact with the soil (including the case where the internal detection electrode is in contact with the waste in the waste disposal site). The external detection electrode and the internal detection electrode may be arranged near the soil surface, or may be arranged inside a vertical hole dug in the soil.
The specific resistance distribution detected using the external detection electrode and the internal detection electrode is for the portion below the both detection electrodes. Therefore, the specific resistance distribution is detected above the external detection electrode and the internal detection electrode. The former arrangement is preferable in order not to cause a portion that is not broken.
[0011]
The plurality of external detection electrodes are disposed outside the vertical impermeable wall. Although there is no restriction | limiting in particular in the arrangement | positioning, Plural things shall be distribute | arranged so that it may be located substantially on the predetermined | prescribed straight line along the vicinity of the said vertical impermeable wall. If the external detection electrodes are arranged in this way, a plurality of types of specific resistance distributions by combinations of various external detection electrodes can be used to detect the state in one vertical plane. Thereby, the presence or absence and location of the vertical impermeable wall can be detected more accurately.
When the external detection electrodes are arranged so as to be substantially positioned on a straight line, those located at both ends of them are such that the lower end of the range of specific resistance distribution detected by the combination of the two is along the vicinity of the straight line. It can arrange | position apart from the distance which reaches | attains the lower end of the said vertical water-impervious wall. In general, the farther the distance between the two external detection electrodes is, the lower end of the specific resistance distribution that can be detected thereby reaches a deeper portion in the soil. By arranging the external detection electrodes as described above, it is possible to detect the breakage occurring at the lower end of the vertical impermeable wall.
At least three external detection electrodes can be arranged on each side so as to be substantially positioned on a predetermined polygonal side surrounding the vertical impermeable wall. By surrounding the entire vertical impermeable wall with the above-mentioned straight line, multiple types of specific resistance distribution can be used for the entire vertical impermeable wall. The presence / absence and location detection accuracy can be improved.
This situation is the same for the internal detection electrodes.
In other words, the arrangement of the internal detection electrodes is not particularly limited, but a plurality of internal detection electrodes may be arranged so as to be substantially positioned on a predetermined straight line along the vicinity of the vertical impermeable wall, or at both ends thereof. The lower end of the range of resistivity distribution detected by the combination of the two is arranged away from the distance to reach the lower end of the vertical impermeable wall along which the straight line runs along its vicinity, At least three can be arranged on each side so as to be substantially positioned on a side of a predetermined polygon inside the impermeable wall (for example, a predetermined polygon surrounding the waste disposal site). .
[0012]
The breakage detection system for a vertical impermeable wall in the present invention may include a power feeding electrode for power feeding. When this exists, the specific resistance distribution detected using the detection electrode becomes stable. The location of the feeding electrode may be appropriately selected according to the location of the external detection electrode and the internal detection electrode.
[0013]
The present invention also proposes the following method.
The method includes determining whether or not the vertical impervious wall is damaged at a waste disposal site surrounded by a vertical impermeable wall embedded in a vertical direction, and placing the soil at a predetermined position outside the vertical impermeable wall. This is a method for detecting a breakage of a vertical impermeable wall that is detected using a plurality of external detection electrodes provided so as to be in contact with each other. And, from among the plurality of external detection electrodes, select any two external detection electrodes, detect a specific resistance distribution in a vertical plane including the selected two external detection electrodes, from the specific resistance distribution, The presence or absence and location of the vertical impermeable wall is detected.
Alternatively, whether or not the vertical impermeable wall is damaged or not in a waste disposal site surrounded by a vertical impermeable wall embedded in the vertical direction is in contact with soil at a predetermined position outside the vertical impermeable wall. A vertical impermeable wall that is detected using a plurality of external detection electrodes provided in this manner and a plurality of internal detection electrodes provided in contact with soil at a predetermined position inside the vertical impermeable wall. This is a damage detection method. Then, an arbitrary two external detection electrodes are selected from the plurality of external detection electrodes, a specific resistance distribution in a vertical plane including the two selected external detection electrodes is detected, and the plurality of internal detections Two arbitrary internal detection electrodes are selected from among the electrodes, a specific resistance distribution in a vertical plane including the two arbitrary internal detection electrodes selected is detected, and the vertical impermeable wall is determined from the two specific resistance distributions. Detect the presence and location of damage.
These methods can also detect the breakage position of the vertical impermeable wall.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of a preferred embodiment of the present invention will be described.
The breakage detection system for vertical impermeable walls in this embodiment is used in a waste disposal site as shown in FIG.
[0015]
This waste disposal site is provided with a recess H in which the waste G is embedded. In this embodiment, the concave portion H is surrounded by a vertical impermeable wall S that is constituted by a impermeable sheet that is buried in the vertical direction and has an end portion connected thereto. The vertical impermeable wall S has a lower end that reaches the clay layer N in the soil. The clay layer N is an impermeable layer, and the sewage that exudes from the waste G does not leak out from the space surrounded by the vertical impermeable walls S and the clay layer N.
[0016]
As shown in FIGS. 1 and 2, the vertical impermeable wall breakage detection system provided in this waste disposal site has a plurality of external detections arranged appropriately inside and outside the vertical impermeable wall S of the waste disposal site. The electrode 10 is configured to include a plurality of internal detection electrodes 20 disposed inside the vertical impermeable wall S and a power feeding electrode 30 for power feeding.
Although both the external detection electrode 10 and the internal detection electrode 20 are not particularly limited in shape, in this embodiment, they are cylindrical.
Both the external detection electrode 10 and the internal detection electrode 20 are disposed in contact with the soil. In this embodiment, both the external detection electrode 10 and the internal detection electrode 20 are contacted with soil by embedding a predetermined length of one end portion of a cylindrical shape. The internal detection electrode 20 is disposed between the recess H and the vertical water shielding wall S.
[0017]
Three or more external detection electrodes 10 and internal detection electrodes 20 are arranged on a polygonal side having a side along the vertical impermeable wall S. In FIG. 2, a polygon having a side on which the external detection electrode 10 rides is indicated by Lo, and a polygon having a side by which the internal detection electrode 20 rides is indicated by Li. The sides of the polygons Lo and Li pass through the vicinity of the vertical impermeable wall S.
[0018]
The power supply electrode 30 is embedded in the waste G. The supply electrode 30 may be disposed in a vertical hole dug in the waste G.
[0019]
The detection electrode 20 is connected to the computer 50 by a connecting line via the switcher 40 shown in FIG. The switcher 40 and the computer 50 have the functions of the external detection means and the internal detection means in the present invention.
[0020]
The switcher 40 selects any two of the external detection electrodes 10 or any two of the internal detection electrodes 20 and is controlled by the computer 50. In this embodiment, for example, two external detection electrodes 10 or two internal detection electrodes 20 for measuring a potential are selected by selection made by a user. In this embodiment, when the external detection electrode 10 is selected, the specific resistance distribution in the vertical plane including the two external detection electrodes 10 is the same as when the internal detection electrode 20 is selected. The specific resistance distribution in the vertical plane including the internal detection electrode 20 is detected.
[0021]
The computer 50 includes an input device 51 that includes a keyboard, a mouse, and the like, and a display 52.
The input device 51 can input at least information for determining which two of the external detection electrode 10 and the internal detection electrode 20 are selected. Based on the information input from the input device 51, the computer 50 selects information for selecting the two external detection electrodes 10 or the internal detection electrodes 20 for determining the vertical plane in which the specific resistance distribution is detected. The data is sent to the switcher 40 described above.
The computer 50 also receives the two external detection electrodes 10, which are received via the switcher 40, based on the potential information measured by the two previously selected external detection electrodes 10 or the internal detection electrodes 20, Alternatively, the specific resistance distribution in the vertical plane including the internal detection electrode 20 is detected.
The display 52 projects a predetermined image under the control of the computer 50. In this embodiment, at least a graph showing the specific resistance distribution is displayed.
[0022]
The power supply electrode 30 is connected to a power source (not shown) and allows a predetermined current to flow through the soil. It is also possible to place the supply electrode 30 under the control of the above-described computer and control the presence or absence of power supply according to the input made by the user using the input device 51. There may be one power supply electrode 30, two positive or negative, or more.
[0023]
This vertical impermeable wall breakage detection system is used as follows.
First, the user inputs information for selecting the two external detection electrodes 10 or the internal detection electrodes 20 for determining the vertical plane in which the specific resistance distribution is detected to the computer 50 via the input device 51. .
Based on this information, the computer 50 sends information for selecting the selected two external detection electrodes 10 or the internal detection electrodes 20 to the switch 40 described above.
Based on this information, the switcher 40 selects the two external detection electrodes 10 and the internal detection electrode 20 as the electrodes whose potential is to be detected.
In the two external detection electrodes 10 or the internal detection electrodes 20, a potential necessary for obtaining a specific resistance distribution in a vertical plane including them is detected. (In this embodiment, at least when the potential is detected by the external detection electrode 10 or the internal detection electrode 20, the power supply by the power supply electrode 30 is performed.)
Information about the detected potential is sent to the computer 50 via the switch 40.
Based on this information, the computer 50 obtains a specific resistance distribution in the vertical plane including the two selected external detection electrodes 10 or the internal detection electrodes 20 and displays an image generated based on this on the display 52. To do. Since the sewage flowing out from the waste G contains a large amount of ions, the degree of sewage outflow can be estimated by detecting the ion distribution by detecting the specific resistance distribution.
Based on the image shown on the display 52, the user can know the damaged portion of the vertical impermeable wall in real time.
[0024]
The same applies to the internal detection electrode 20, but the range of specific resistance distribution that can be obtained for the two external detection electrodes 10 is shown in FIG.
FIG. 4 shows four external detection electrodes 10A to 10D.
The range of the specific resistance distribution that can be obtained by selecting two of these external detection electrodes 10 is three interior angles of 45 °, 45 °, and 90 ° with the selected external detection electrode 10 as the apex. It is approximately equal to the range of a certain right isosceles triangle. That is, in FIG. 4, the range of the specific resistance distribution that can be obtained when the external detection electrodes 10A and 10B are selected is a triangle (three internal angles) connecting the external detection electrodes 10A and 10B and the vertex AB. Is approximately equal to a range of right isosceles triangles of 45 °, 45 °, and 90 °), and the range of specific resistance distribution that can be obtained when the external detection electrodes 10B and 10C are selected is the range of both external detection electrodes 10B. 10C and the apex BC are approximately equal to the range of the right isosceles triangle, and the range of the specific resistance distribution that can be obtained when the external detection electrodes 10B and 10D are selected is the two external detection electrodes 10B and 10D. Is approximately equal to the range of a right isosceles triangle connecting the vertices BD, and the range of specific resistance distribution that can be obtained when the external detection electrodes 10A and 10D are selected is as follows. 10A, a 10D, substantially equal to the range of isosceles right triangle connecting the apex AD.
In this way, by appropriately changing the two external detection electrodes 10 and the internal detection electrode 20 to be selected, the range and depth of the specific resistance distribution to be detected are switched, and the damaged portion of the vertical impermeable wall including its position is included. To detect.
[0025]
FIG. 5 shows a modification of the vertical impermeable wall breakage detection system described above.
This vertical impermeable wall breakage detection system is configured substantially the same as the vertical impermeable wall breakage detection system described above. The differences are as follows.
Three or more external detection electrodes 10 in this vertical impermeable wall breakage detection system are provided on each side of the polygon Lo having sides along the vertical impermeable wall S in the same manner as described above. It is arranged to ride.
In this case, for example, in the short side where only three external detection electrodes can be arranged among the sides of the polygon Lo, even if the external detection electrodes 10 at both ends capable of detecting the specific resistance distribution to the deepest range are used, There is a possibility that the specific resistance distribution at the lower end of the vertical impermeable wall S cannot be detected. In consideration of such a case, in the breakage detection system for the vertical impermeable wall in this modification, the auxiliary external detection electrode 10X is additionally arranged so as to be arranged on a line extending the side. To do. In this case, the additional external detection electrode 10X is separated from the distance at which the lower end of the specific resistance distribution detected by the combination of the two ends thereof reaches the lower end of the vertical impermeable wall S in the vicinity thereof. Arrange. Referring to the example of FIG. 4, when one of the auxiliary external detection electrodes 10X is the external detection electrode A and the other is the external detection electrode B, the depth of the vertex AB is the vertical impermeable wall S. It should be deeper than the bottom edge.
Thereby, it becomes possible to detect the occurrence of damage anywhere on the vertical impermeable wall S.
[0026]
【The invention's effect】
Since the present invention is as described above, it becomes possible to detect the breakage position of the vertical impermeable wall.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a configuration of a breakage detection system for a vertical impermeable wall according to an embodiment of the present invention.
FIG. 2 is a plan view showing the configuration of the vertical impermeable wall breakage detection system shown in FIG. 1;
FIG. 3 is a diagram schematically showing a device connected to the detection electrode shown in FIG. 1;
FIG. 4 is a diagram schematically showing a range of a specific resistance distribution detected by an external detection electrode.
5 is a plan view showing a configuration of a modification of the vertical impermeable wall breakage detection system shown in FIG. 1. FIG.
[Explanation of symbols]
S Vertical impermeable wall H Concave G Waste 10 External detection electrode 20 Internal detection electrode 30 Power supply electrode 40 Switch 50 Computer

Claims (15)

A vertical impermeable wall breakage detection system for detecting the presence and location of the vertical impermeable wall breakage in a waste disposal site surrounded by vertical impermeable walls embedded in a vertical direction,
A plurality of external detection electrodes arranged in a predetermined position outside the vertical impermeable wall, in contact with the soil;
An external detection means for detecting a specific resistance distribution in a vertical plane including one of these external detection electrodes and other external detection electrodes;
With
A vertical impermeable wall breakage detection system configured to detect whether or not the vertical impermeable wall is broken and where from the specific resistance distribution detected by the external detection means. A plurality of internal detection electrodes arranged in contact with the soil and arranged at predetermined positions inside the vertical impermeable wall;
Internal detection means for detecting a specific resistance distribution in a vertical plane including one of these internal detection electrodes and other internal detection electrodes;
With
From the specific resistance distribution detected by the external detection means and the internal detection means, the presence or absence of damage to the vertical impermeable wall and the location are detected.
The breakage detection system for a vertical impermeable wall according to claim 1. The external detection means can select any two external detection electrodes and detect a specific resistance distribution in a vertical plane including the two selected external detection electrodes.
The breakage detection system for a vertical impermeable wall according to claim 1. The internal detection means can select any two internal detection electrodes, and can detect a specific resistance distribution in a vertical plane including the selected two internal detection electrodes.
The damage detection system for a vertical impermeable wall according to claim 2. A power supply electrode for power supply is further provided.
The breakage detection system for a vertical impermeable wall according to claim 1. The external detection electrode is arranged near the soil surface,
The breakage detection system for a vertical impermeable wall according to claim 1. The internal detection electrode is arranged near the soil surface,
The breakage detection system for a vertical impermeable wall according to claim 1. The plurality of external detection electrodes are arranged so as to be substantially positioned on a predetermined straight line along the vicinity of the vertical impermeable wall,
The breakage detection system for a vertical impermeable wall according to claim 1. The plurality of internal detection electrodes are arranged so as to be substantially positioned on a predetermined straight line along the vicinity of the vertical impermeable wall,
The damage detection system for a vertical impermeable wall according to claim 2. Those located at both ends of the external detection electrode,
Distance the lower end of the range for detecting the resistivity distribution by a combination of the two to reach the lower end of the vertical water shield wall the line is along the vicinity thereof are disposed apart than,
The damage detection system for a vertical impermeable wall according to claim 8. The plurality of external detection electrodes are disposed at least three on each side so as to be substantially positioned on a predetermined polygonal side surrounding the vertical impermeable wall.
The breakage detection system for a vertical impermeable wall according to claim 1. The plurality of internal detection electrodes are arranged on each side so as to be substantially positioned on a predetermined polygonal side surrounding the waste disposal site,
The breakage detection system for a vertical impermeable wall according to claim 1. The side is assumed to be along the vertical impermeable wall,
The breakage detection system for a vertical impermeable wall according to claim 11 or 12. Whether or not the vertical impermeable wall is damaged or not in a waste disposal site surrounded by vertical impermeable walls embedded in the vertical direction is in contact with soil at a predetermined position outside the vertical impermeable wall. A method for detecting breakage of a vertical impermeable wall that is detected using a plurality of external detection electrodes,
Of the plurality of external detection electrodes, select any two detection electrodes,
Detect the specific resistance distribution in the vertical plane including any two selected external sensing electrodes,
From the specific resistance distribution, the presence or absence of the vertical impermeable wall is detected, and the location,
Method for detecting damage to vertical impermeable walls. Whether or not the vertical impermeable wall is damaged or not in a waste disposal site surrounded by vertical impermeable walls embedded in the vertical direction is in contact with soil at a predetermined position outside the vertical impermeable wall. Detecting breakage of a vertical impermeable wall that is detected using a plurality of external detection electrodes provided at a predetermined position inside the vertical impermeable wall and in contact with soil at a predetermined position inside the vertical impermeable wall A method,
Of the plurality of external detection electrodes, select any two external detection electrodes, detect a specific resistance distribution in a vertical plane including any two selected external detection electrodes, and Among them, select any two internal detection electrodes, detect the specific resistance distribution in the vertical plane including any two selected internal detection electrodes,
From the two specific resistance distributions, the presence or absence of the vertical impermeable wall and the location are detected.
Method for detecting damage to vertical impermeable walls.

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