JPH11183448A - Method and system for monitoring of collapse of slope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method and a system in which the collapse of a slope as cut, filling or the like is judged with high accuracy without any malfunction. SOLUTION: An AE waveform which is detected by an AE sensor which is installed at a slope or the like is input to an AE parameter part 5 via an AE amplifier 4. The AE parameter part 5 computes the AE waveform so as to obtain a continuity degree parameter. The continuity degree parameter expresses a continuity degree in such a way that the input AE waveform is envelope-detected and that the time which exceeds a threshold value within a unit time is measured. A data analytical part 6 judges whether the continuity degree parameter which is continued for a prescribed time in the prescribed number of seconds contains the prescribed numbers of times or higher. When the number of continuity degrees in the continuity degree parameter is at a judgment reference or higher, the generation of the collapse of the slope is detected, and an emergency signal is output to a warning device together with slope position information which is set in an input data part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and system for monitoring a slope failure, and more particularly to a technique which is effective when applied to determination of occurrence of a slope failure in an open portion including a cut slope and an embankment slope.

[0002]

2. Description of the Related Art According to studies by the present inventor, an AE (Acous) is used as a method for detecting and monitoring a slope failure such as an open portion comprising a rock slope, a cut slope, and an embankment slope.
A technique using ticEmissin (acoustic wave) measurement is being used.

[0003] In this AE measurement, an AE sensor for detecting an acoustic wave generated by plastic deformation or destruction is embedded on a slope, and the number of ring-down counts or event counts of the AE detected by the AE sensor during a certain period of time is measured. Slope failure is determined using the number as a parameter representing the frequency of occurrence.

A threshold value is set in advance for the ring-down count number and the event count number, and is a count value when the AE waveform detected within a predetermined time is larger than the threshold value. .

[0005] Examples of this type of AE measurement technology are described in detail on May 1, 1990 by the Japan Non-Destructive Inspection Association, the Japan Non-Destructive Inspection Association (ed.), "Acoustic. This document describes the characteristics of the AE method and the like.

[0006]

However, the present inventors have found that the AE measurement technique as described above has the following problems.

That is, the AE generated when the slope collapses is not uniform, has various patterns, and the attenuation of the AE during propagation in the soil is large. Is difficult.

Further, it is difficult to determine what the accumulated value of the AE count is, which is the count value, at which the slope has collapsed. Although there is a slope failure, there is a possibility that the slope failure will not be determined.

An object of the present invention is to provide a method and a system for determining a slope failure which can determine a slope failure with high accuracy without malfunction.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0011]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

That is, the method for monitoring slope failure according to the present invention comprises:
A generated by deformation and destruction of soil particles and rocks
The E wave is detected by the AE detecting means, the detected AE waveform is calculated into a continuity parameter representing the continuity within a unit time, the continuity is determined from the continuity parameter, and the slope failure is detected. is there.

In the slope failure monitoring method of the present invention, the continuity parameter is obtained by detecting an envelope of an AE waveform and measuring a time during which the envelope exceeds a threshold value.

Further, in the slope failure monitoring method according to the present invention, the continuity parameter generates a peak line connecting the maximum values of the respective waves in the AE waveform, and the peak line exceeds a threshold value. It consists of the result of measuring time.

Thus, the occurrence of slope failure due to rainfall or the like can be detected in a short time and with high accuracy.

Further, the slope failure monitoring system of the present invention provides an AE generated by deformation and destruction of soil particles and rocks.
AE detecting means for detecting a wave motion, a parameter calculating unit for calculating an AE waveform detected by the AE detecting means into a continuity parameter representing continuity within a unit time, and a continuity parameter of the parameter calculating unit. It is a data analyzer that determines whether or not a slope failure has occurred by determining the continuous frequency, and outputs an emergency signal when a slope failure has occurred.

Thus, the occurrence of slope failure due to rainfall or the like can be detected with high accuracy using a simple circuit configuration.

Further, the slope failure monitoring system of the present invention is provided with a data storage unit for storing the analysis result of the data analysis unit.

Thus, the stored data can be verified, so that the occurrence of slope failure can be detected with higher accuracy.

Further, the slope failure monitoring system of the present invention comprises:
A position information input unit for arbitrarily setting the position information of the slope on which the AE detecting means is installed is provided, and the data analysis unit outputs the position information set in the position information input unit together with the emergency signal.

Thus, the position where the slope collapse has occurred can be specified accurately and quickly.

As described above, the occurrence of a wide range of slope failure can be detected in real time and with high accuracy.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a configuration diagram of a slope failure monitoring system according to one embodiment of the present invention, FIG. 2 is a block diagram of an AE measuring device provided in the slope failure monitoring system according to one embodiment of the present invention, Figure 3 shows the AE installed on the embankment slope
FIG. 4 is a cross-sectional view of the sensor, FIG. 4 is a plan view of the AE sensor installed on the embankment slope, FIGS. 5A and 5B are explanatory diagrams showing the installation procedure of the AE sensor installed on the embankment slope, FIG. Is a sectional view of the AE sensor installed on the cut slope, FIG. 7 is a plan view of the AE sensor installed on the cut slope, FIGS.
(B) is an explanatory view showing an installation procedure of an AE sensor installed on a cut slope according to the present invention, and FIG. 9 (a) is a diagram illustrating a process performed by an AE measuring device according to an embodiment of the present invention. Explanatory drawing of the ring-down count number representing the frequency, (b) is A
FIG. 10 is an explanatory diagram of an event count number representing an occurrence frequency processed by the E measuring device. FIG. 10 is an explanatory diagram of a parameter indicating continuity of a signal processed by the AE measuring device according to the embodiment of the present invention. 5 is a flowchart of a slope failure determination in the slope failure monitoring system according to one embodiment of the present invention.

In the present embodiment, the slope failure monitoring system 1 detects a slope failure due to rainfall or the like by AE measurement and issues an alarm or the like in an open portion including a cut slope and an embankment slope.

As shown in FIG. 1, the slope failure monitoring system 1 is provided with a plurality of AE sensors (AE detecting means) 2. AE wave generated by friction of the AE is detected, and the detected AE waveform is measured.

The AE sensor 2 is connected to an AE measuring device 3. The AE measuring device 3 calculates AE parameters from the AE waveform detected by the AE sensor 2 and determines whether or not a slope failure has occurred.

The AE measuring device 3 is connected to, for example, an alarm device for notifying that the inclination collapse has occurred by an alarm or the like. The AE measuring device 3 receives an emergency signal or the like output from the AE measuring device 3 by using a contact output or the like. External output to alarm device.

Next, the configuration of the AE measuring device 3 will be described with reference to FIG.

The AE measuring device 3 is provided with an AE amplifier 4. The AE amplifier 4 is connected to the AE sensor 2 and amplifies the AE waveform detected by the AE sensor 2. The AE amplifier 4 is connected to an AE parameter (parameter operation unit) 5. The AE parameter 5 is
The event count number, the downlink count number, and the continuity parameter are calculated as parameters indicating the AE occurrence frequency.

The AE parameter 5 is connected to a data analyzer 6. The data analysis unit 6 is connected to an input data unit (position information input unit) 7 for setting information on the slope position using a dip switch or the like.

The data analysis unit 6 determines whether or not a slope failure has occurred based on the parameters calculated by the AE parameters 5. If a slope failure has occurred, the data set in the input data unit 7 is determined. And an emergency signal for judging that the slope collapse has occurred is output to the above-mentioned alarm device or the like.

Next, a method of installing the AE sensor will be described.

When installing on an embankment slope, as shown in FIG. 3, the AE sensor 2 is attached to the tip of a waveguide rod, a so-called waveguide 81, and buried underground. The waveguide 8 is made of a metal such as stainless steel, which has good signal propagation, and has a length of about 2 m.

The AE sensors 2 are installed in a horizontal line near the middle of the slope. Further, since the embankment slope is expected to be long, the A is used to reduce the number of AE sensors 2.
The interval between the E sensors 2 is, for example, 1 as shown in FIG.
It is buried at 5m intervals. The buried depth of the AE sensor 2 is rain,
In order to avoid the influence of wind, etc., secure about 50cm or more of earth covering.

Further, if a slope failure occurs only between the AE sensors 2, there is a possibility that the AE waveform does not propagate. Therefore, the AE sensors 2 are connected to each other by a chain 9 or the like, and the waveguide 8 is connected when the slope collapses. AE is forcibly generated by extracting the AE.

The procedure for embedding the AE sensor 2 is as follows: as shown in FIG.
As shown in FIG. 5 (b), a waveguide 8 having an AE sensor 2 attached at its tip is buried in the excavated hole. Further, the chains 9 are connected to the respective waveguides 8 as described above. And FIG.
As shown in (c), the excavated hole is backfilled and AE
The installation of the sensor 2 is completed.

The length, burying depth, burying interval, and the like of the above-described waveguide 8 are standard, and appropriate adjustments are made in accordance with site conditions.

A method of installing the AE sensor 2 on a cut slope will be described.

Even in the case of a cut slope, the AE sensor 2
As shown in FIG. 6, are installed in a row in the horizontal direction near the middle of the slope. Waveguide 8 is 1m long
And the interval is about 10 m as shown in FIG. On cut slopes, there is no connection between the waveguides 8 by a chain or the like in principle.

As shown in FIG. 8 (a), the AE sensor 2 is buried in the vicinity of the middle of the slope by about 160 cm, and the AE sensor 2 is provided at the tip of the hole as shown in FIG. 8 (b). Insert the waveguide 8 to which 2 is attached. Then, as shown in FIG. 5C, the mortar 10 is inserted into the hole into which the waveguide 8 to which the AE sensor 2 is attached is inserted.
And the installation of the AE sensor 2 is completed.

Also in this case, the length, burying depth, burying interval, presence / absence of chain connection, etc. of the above-mentioned waveguide 8 are standard, and appropriate adjustments are made according to the site conditions.

Next, the operation of the present embodiment will be described.

First, A detected by the AE sensor 2
The E waveform is input to the AE amplifier 4 of the AE measuring device 3,
Signal amplification is performed. And the amplified AE waveform is
The AE parameter 5 is input to the AE parameter 5 to calculate a ring-down count number, an event count number, and a continuity parameter as parameters.

As shown in FIG. 9A, a predetermined threshold value is set for the ring-down count number, and the number of times that the magnitude of the input AE waveform becomes equal to or greater than the threshold value is set. It is to count. The event count counts, as shown in FIG. 9B, the number of AE waveforms having an AE waveform equal to or larger than a threshold value. The occurrence frequency of the AE is represented by the ring down count number and the event count number.

As shown in FIG. 10, the continuity parameter detects the occurrence of a continuous AE. For example, the continuity parameter detects the envelope of the input AE waveform, and within a unit time (one second in this case). ), The time over the threshold is measured, and this is used as a continuity parameter indicating the continuity of the signal.

The continuity parameter measures not only the envelope detection described above but also a time exceeding a threshold such as a time exceeding a threshold of a peak line connecting the peak values of the AE waveform. Any parameters can be used.

The calculation results of the ring-down count number, event count number, and continuity parameter calculated by the AE parameter 5 are input to the data analysis unit 6, and it is determined whether a slope failure has occurred. .

Here, a method of determining slope failure by the data analysis unit 6 will be described with reference to the flowcharts of FIGS. 1, 2 and 11.

First, the parameters for 30 seconds calculated by the AE parameter 5 are input to the data analyzer 6 (step S101). Therefore, in the data analysis unit 6, the determination is made every 30 seconds.

It is determined whether or not the event count among the input parameters is 100 or more (step S102). If the event count is 99 or less, step S1 is performed.
Returning to the process of 01, if it is 100 or more, it is determined whether or not the ring down count is 1000 or more (step S103).

If the ring down count is less than 999, the process returns to step S101. The processing of steps S102 and S103 is for confirming the degree of occurrence of AE.

When the ring-down count is 1000 or more, the AE waveform in units of 30 seconds is divided into predetermined seconds.
Among the seconds, it is determined whether or not the continuity parameter that continues for a predetermined time within a predetermined number of seconds is equal to or greater than a predetermined number (step S104).

As a criterion for the processing in step S104, for example, an AE waveform in units of 30 seconds
If the AE waveform is divided every 30 seconds and the continuity parameter continuous for 10 seconds is one or more times, the AE waveform in units of 30 seconds is divided every 5 seconds, and the continuity parameter that is continuous for 4 seconds every 5 seconds is three or more times In some cases, as well as 3 in 5 seconds
There may be a case where there is a continuity parameter that continues for seconds.

In the process of step S104, when the continuity of the continuity parameter is equal to or greater than the above-described criterion, it is determined that a slope collapse has occurred, and the slope position set in the input data unit 7 is determined. An emergency signal indicating that the slope collapse has occurred is output to the alarm signal device 4 and the information transmission device 5 together with the indicated information (step S105).

Further, the above-mentioned steps S102 to S10
The criteria of the event count, the ring-down count, and the continuity count in the process No. 5 are merely examples, and appropriate adjustment is performed according to the situation at the site.

Further, in the process of step S104,
If the continuation frequency is equal to or less than the aforementioned criterion, the process returns to step S101. The emergency signal externally output from the AE measuring device 3 is output to the above-described alarm device or the like.

Thus, according to the present embodiment, AE
When the measurement device 3 determines the occurrence of the slope failure by using the parameter of the continuous frequency, the slope failure can be determined in a short time and with high accuracy.

In this embodiment, first, A
After confirming the degree of AE occurrence from the ring-down count number and event count number representing the frequency of E occurrence, the occurrence of slope failure was detected by the continuous frequency, but the degree of AE occurrence was confirmed by the ring-down count number and the event count number. , The slope failure can be detected with high accuracy even if the occurrence of the slope failure is determined based only on the continuous frequency.

Although the invention made by the inventor has been specifically described based on the embodiments of the present invention, the present invention is not limited to the above embodiments, and various modifications may be made without departing from the gist of the invention. Needless to say, it can be changed.

For example, as shown in FIG. 12, the AE measuring device 3 may be provided with a data storage unit 11 such as a card memory for storing various data analyzed by the data analysis unit 6.

Thus, the analysis data of the site where the AE sensor 2 is installed can be accumulated and the validity of the occurrence of the slope failure can be verified, so that the slope failure can be detected with higher accuracy. .

Further, by accumulating the analysis data, the reference values of the AE count number and the continuous frequency can be changed to more reasonable values.

Further, in the above-described embodiment, the description has been made of the monitoring of the slope failure in the cut and the embankment. However, the monitoring method and the system for the slope failure are, for example, monitoring of various slope failures in the rock slope or the underground cavity. This makes it possible to determine the slope failure in a short time and with high accuracy.

[0065]

Advantageous effects obtained by typical ones of the inventions disclosed by the present application will be briefly described as follows.
It is as follows.

(1) According to the present invention, an AE waveform is calculated as a continuity parameter, and slope failure detection is performed based on the continuity, so that slope failure can be generated with high accuracy.

(2) Further, according to the present invention, since the position where the slope failure has occurred can be accurately and quickly specified, the occurrence of the slope failure in a wide range can be accurately detected in real time.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a slope failure monitoring system according to an embodiment of the present invention.

FIG. 2 is a block diagram of an AE measuring device provided in the slope failure monitoring system according to one embodiment of the present invention.

FIG. 3 is a cross-sectional view of an AE sensor installed on an embankment slope.

FIG. 4 is a plan view of an AE sensor installed on an embankment slope.

FIGS. 5A to 5C are AEs installed on an embankment slope;
It is explanatory drawing which shows the installation procedure of a sensor.

FIG. 6 is a cross-sectional view of an AE sensor installed on a cut slope.

FIG. 7 is a plan view of an AE sensor installed on a cut slope.

FIGS. 8A to 8C are AEs installed on a cut slope.
It is explanatory drawing which shows the installation procedure of a sensor.

9A is an explanatory diagram of a ring-down count number representing an occurrence frequency processed by the AE measurement device according to one embodiment of the present invention, and FIG. 9B is an occurrence frequency processed by the AE measurement device; FIG. 9 is an explanatory diagram of an event count number indicating the event count.

FIG. 10 is an explanatory diagram of a parameter indicating a continuity of a signal processed by the AE measuring device according to the embodiment of the present invention;

FIG. 11 is a flowchart of determination of a slope failure in the slope failure monitoring system according to one embodiment of the present invention.

FIG. 12 is a block diagram of an AE measurement device provided in a slope failure monitoring system according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 slope failure monitoring system 2 AE sensor (AE detecting means) 3 AE measuring device 4 AE amplifier 5 AE parameter (parameter calculation unit) 6 data analysis unit 7 input data unit (position information input unit) 8 waveguide 9 chain 10 mortar 11 Data storage

Claims (6)

[Claims] An AE detection unit detects an AE wave generated by deformation and destruction of a soil particle or a rock, and calculates a detected AE waveform into a continuity parameter representing continuity within a unit time. A slope failure monitoring method, wherein a slope failure is detected by determining a continuous frequency from a degree parameter. 2. The slope failure monitoring method according to claim 1, wherein the continuity parameter is a result of performing envelope detection on the AE waveform and measuring a time during which the envelope exceeds a threshold. A slope failure monitoring method, characterized in that: 3. The slope failure monitoring method according to claim 1, wherein the continuity parameter generates a peak line connecting maximum values of respective waves in the AE waveform, and the peak line sets a threshold value. A slope failure monitoring method characterized in that it is a result of measuring a time exceeding the slope. 4. An AE detecting means for detecting AE waves generated by deformation and destruction of soil particles and rocks, and an AE waveform detected by the AE detecting means is converted into a continuity parameter representing continuity within a unit time. A parameter calculation unit for calculating, a data analysis for determining whether a slope failure has occurred by determining a continuous frequency from the continuity parameter of the parameter calculation unit, and outputting an emergency signal when the slope failure has occurred; A slope failure monitoring system, comprising: 5. The slope failure monitoring system according to claim 4, further comprising a data storage unit for storing an analysis result of the data analysis unit. 6. The slope failure monitoring system according to claim 4, further comprising: a position information input unit that can arbitrarily set position information of the slope on which the AE detecting unit is installed, wherein the position information input unit is set to the position information input unit. A slope failure monitoring system, wherein the data analyzer outputs position information together with an emergency signal.