JP2001193069A - Measuring control method during earth retaining excavation, measuring control system during earth retaining excavation and recording media recorded computer programs for realizing measuring control system during earth retaining excavation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide measurement control system and method during earth retaining excavation capable of forecasting the behavior of earth retaining construction with a high accuracy in excavation work even in the case where the characteristics of earth retaining wall cannot be accurately obtained in advance. SOLUTION: Behavior values A of (displacement, stress and moment) of the earth retaining construction are measured (S10) and are indicated by colors (S12 to S20) corresponding to the size relation with the control values (S12 to S20). By the reverse analytic calculations from the measured behavior values A, unknown parameters such as an earth pressure P, reaction coefficient ke of the ground, cohesion C of the ground, angle of friction ϕ of the ground, volumetric weight γ of the ground, cross section rigidity Kw of an earth retaining wall 10 and spring constant ks of a strut 16 are estimated (S22). By using these estimated values, the behavior values of the timbering construction in the subsequent process are estimated (S26). These calculated behavior value B are monitored on a monitor unit installed on the construction site (S28).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measurement management system and a measurement management method for retaining excavation, and more particularly to a measurement management system and a measurement management method capable of predicting the behavior of a retaining structure with high accuracy. About.

[0002]

2. Description of the Related Art Conventionally, in excavation work performed when constructing underground structures such as standing piles, subways, and structural foundations, earth retaining walls are constructed prior to excavation to prevent collapse of an excavated surface. In addition to minimizing the impact on the surrounding area, the impact on the surrounding area due to land subsidence is minimized. As the excavation work progresses, the retaining wall shows the ground properties (earth pressure, reaction force coefficient,
Behavior such as deformation and stress depending on the adhesive force, friction angle, volume weight, etc.) occurs. However, it is difficult to accurately predict the behavior of the retaining wall based on the previously provided ground property values because the ground property values vary greatly.

On the other hand, the present applicant has disclosed in Japanese Patent Application Laid-Open
In Japanese Patent No. 331161, a behavior capable of estimating a ground physical property value from an actually measured value of a behavior of a retaining frame and accurately estimating a behavior of a retaining wall during excavation work by using the estimated value. A prediction method is proposed. In this method, the earth pressure, the reaction force coefficient of the ground, the adhesive force of the ground, the friction angle of the ground, the physical properties of the ground such as the volume weight of the ground and the parameters of the shear beam spring coefficient are maximized at predetermined initial values. Such a membership function is set. Then, the behavior of the retaining wall is calculated while changing the value of each parameter on the membership function, and a value when the behavior substantially coincides with the actually measured behavior of the retaining wall is used as a confirmed value of each parameter. .

[0004]

By the way, the behavior of the earth retaining frame greatly depends not only on the physical properties of the ground and the spring constant of the girder, but also on the characteristics of the earth retaining wall (for example, section rigidity). When the structure of the retaining wall becomes complicated, it may be difficult to accurately obtain the characteristics in advance. However, in the behavior prediction method disclosed in the above publication, the characteristics of the retaining wall are regarded as constant, and a given value is used as the value. For this reason, when the characteristics of the retaining wall cannot be accurately obtained in advance, it has been difficult to predict the behavior of the retaining frame with high accuracy.

The present invention has been made in view of the above points, and even when it is difficult to accurately obtain the characteristics of a retaining wall in advance, the behavior of the retaining frame during excavation work can be predicted with high accuracy. It is an object of the present invention to provide a measurement management method and a measurement management method system at the time of earth retaining excavation which can be performed.

[0006]

The above object is achieved by the present invention.
As described in the above, in the measurement management method at the time of earth retaining excavation to predict the behavior of the earth retaining frame in the subsequent excavation process during the excavation work using the earth retaining frame, represents the behavior of the earth retaining frame A behavior detection step of detecting a behavior value, a parameter estimation step of estimating a value of an unknown parameter including a property value of a ground to be excavated and a characteristic value of the retaining wall, based on the detected behavior value, A behavior prediction step of predicting and calculating a behavior value of the earth retaining frame in a subsequent excavation process based on the estimated unknown parameter value;
This is achieved by a measurement management method during earth retaining excavation provided with:

According to the first aspect of the present invention, the value of the unknown parameter including the characteristic value of the retaining wall is estimated in addition to the physical property value of the ground, and the behavior value of the retaining frame is predicted based on the estimated value. calculate. For this reason, even when the characteristics of the retaining wall cannot be accurately obtained in advance, the behavior of the retaining frame can be predicted with high accuracy. As the behavior value of the retaining wall, for example, a displacement, a stress, and a moment of the retaining wall, and a load acting on the shoring can be used. As the characteristic value of the retaining wall, for example, the retaining wall can be used. The section stiffness of the wall can be used.

[0008] In this case, as set forth in claim 2, in the measurement management method at the time of retaining earth excavation according to claim 1, the parameter estimating step uses the given value as the unknown parameter value. A behavior calculation step of calculating a behavior value of the retaining frame, and after increasing or decreasing the value of the unknown parameter by a predetermined value, respectively, according to a magnitude relationship between the calculated behavior value and the detected behavior value, The recalculation step of executing the calculation step, and when the behavior value calculated in the behavior calculation step and the detected behavior value substantially match, the value of the unknown parameter used in the calculation of the behavior value is calculated. And determining an estimated value that is determined as the estimated value.

According to the second aspect of the invention, the behavior value of the earth retaining frame is calculated based on the magnitude relation between the calculated behavior value and the detected behavior value while increasing or decreasing the value of the unknown parameter. . As described above, the value of the unknown parameter can be estimated by a simple iterative calculation process.

Also, as described in claim 3, claim 2
In the measurement management method at the time of retaining earth excavation as described above, for each of the unknown parameters, a correspondence relationship between an increase or decrease of the value of the unknown parameter and an increase or decrease of the behavior value of the earth retaining frame is obtained in advance, and the recalculating step is performed. Then, the increasing / decreasing direction of each unknown parameter may be determined based on the correspondence so that the calculated behavior value approaches the detected behavior value.

According to the third aspect of the present invention, the calculated behavior value is detected by referring to a relation table showing a relationship between an increase / decrease of the value of the unknown parameter and an increase / decrease of the behavior value of the earth retaining frame. The direction of increase / decrease of each unknown parameter is determined so as to approach the behavior value. Therefore, iterative calculations for estimating the unknown parameters can be quickly converged.

Furthermore, as described in claim 4, claim 1
4. The measurement management method at the time of earth retaining excavation according to any one of the above-described aspects 3, wherein the method further includes a step of displaying a predicted calculation value in the behavior estimation step at an excavation site.

According to the fourth aspect of the present invention, the predicted value of the behavior of the earth retaining frame is displayed at the excavation site. For this reason, the worker can confirm the safety of the construction and perform the excavation work safely while taking measures such as countermeasures as necessary.

The invention according to claims 5 to 8 relates to a system for executing the method according to claims 1 to 4, respectively.

Further, the invention according to claims 9 to 11 is
The present invention relates to a recording medium on which a program for realizing a measurement management system during earth retaining excavation by a computer is recorded.

[0016]

FIG. 1 is a schematic cross-sectional view showing the state of earth retaining excavation work to which a measurement management system at the time of earth retaining excavation according to one embodiment of the present invention is applied. In the earth retaining excavation shown in FIG. 1, after the earth retaining wall 10 is constructed before the start of excavation, excavation is performed to a predetermined depth by a plurality of excavation processes. The excavated layer excavated in the i-th excavation step is represented by excavated layer i (i = 1, 2, 3,...). FIG. 1 shows a state in which excavation of the excavation layer 1 has been completed. In FIG. 1, the soil layers 1 to 4 classified based on the results of the soil investigation and the like are indicated by broken lines.

As shown in FIG. 1, when the excavation of the excavation layer 1 is completed, a cutting beam 16 is provided on the retaining wall 10 as a support, and then the excavation of the excavation layer 2 is performed. After that, similarly, each time the excavation of each excavation layer is completed, the cutting beam 16 is provided on the retaining wall 10, and then the next excavation layer is excavated.

The retaining wall 10 is provided with a plurality of inclinometers 12 and strain gauges 14 at predetermined intervals in the depth direction. The inclinometer 12 outputs a signal corresponding to the inclination angle of the retaining wall 10 from the vertical direction. In addition, the strain gauge 14
Are provided as a pair on the excavation surface of the retaining wall 10 and on the back surface thereof, and output a signal corresponding to the magnitude of distortion generated on each surface of the retaining wall 10. The above-mentioned predetermined intervals are set so that the tilt angle and the strain can be detected at least at one location of each excavation layer i by the inclinometer 12 and the strain gauge 14.

FIG. 2 is a schematic configuration diagram of the measurement management system of the present embodiment. The entire measurement management system is installed at the excavation site. As shown in FIG. 2, the measurement management system includes a computer 20. Computer 2
0 includes a central processing unit 20a, a display device 20b, and a recording medium reading drive device 20c. The above-described inclinometer 12 and strain gauge 14 are connected to the central processing unit 20 a of the computer 20. The central processing unit 20a executes the inclinometer 12 every time excavation of each excavation layer is completed.
And the retaining wall 10 based on the output signal of the strain gauge 14.
The horizontal displacement, stress, and moment at each position (hereinafter, collectively referred to as behavior values of the retaining wall 10) are detected. Then, as described in detail below, based on the detected behavior value, the physical property value of the ground at each excavation layer (that is, the earth pressure P,
Ground reaction force coefficient ke, ground adhesive strength C, ground friction angle φ, ground volume weight γ), section rigidity K of retaining wall 10
w and the spring constant ks of the girder 16 are estimated, and the behavior value after the next excavation process is predicted and calculated based on the estimated value and displayed on the display device 20b. Hereinafter, the physical property values P, ke, C, φ, γ of these grounds, the sectional rigidity Kw of the retaining wall 10,
And the spring constant ks of the cutting beam 16 is generically called an unknown parameter. The spring constant of the girder 16 itself can be determined in advance, but the substantial spring constant of the girder 16 changes due to looseness of the portion attached to the retaining wall 10 and the value becomes indefinite. The spring constant ks of the cutting beam 16 is a value including such uncertain factors such as looseness of the mounting portion.

The measurement management system according to the present embodiment
The feature is that the section rigidity of the retaining wall 10 is included in the unknown parameter, and the value is estimated together with the characteristic value of the ground. Accordingly, even when the structure of the retaining wall 10 is complicated and it is difficult to accurately determine the sectional rigidity thereof, or when the sectional rigidity changes depending on the depth, the behavior of the retaining wall structure can be reduced. Prediction can be performed with high accuracy.

The above functions are realized when the computer 20 executes a predetermined program. Hereinafter, the contents of the program executed by the computer 20 to realize the above functions in the present system will be described.

FIG. 3 is a flowchart of a main program executed by the computer 20 in this embodiment. FIG. 4 is a flowchart of a subroutine program for obtaining the value of each unknown parameter by inverse analysis in the main program. Note that FIG.
The program whose flowchart is shown in FIG. 4 is recorded on a recording medium 20d (for example, a semiconductor memory, a hard disk, a floppy disk, a CD-ROM, a DVD-ROM, etc.) readable by the computer 20. The program is read from the recording medium 20d via the reading drive device 20c and executed. Alternatively, the program may be downloaded from a server computer to the central processing unit 20a via a computer network such as the Internet and executed.

First, the contents of the main program will be described with reference to FIG. The main program is executed by the operator performing an instruction operation on the computer 20 every time the excavation process of each excavation layer is completed.
In the following description, it is assumed that the main program is executed when excavation of the excavation layer N is completed. When the main program is started, first, in step S
Ten processes are executed.

In step S10, an actual measured value of a behavior value at each position of the retaining wall 10 (hereinafter referred to as an actual measured behavior value A) is obtained based on the output signals of the inclinometer 12 and the strain gauge 14.

In step S12, the measured behavior value A is the first
Is determined to be less than or equal to the management value R1. As a result, when A ≦ R1, the measured behavior value A is plotted in light blue on the screen of the display device 20b in step S14. In step S12, A ≦ R1
Is not established, it is next determined in step S16 whether or not the actually measured behavior value A is equal to or smaller than the second management value R2 (> R1).

The first management value R1 and the second management value R
2 is set as a function value according to the position of the retaining wall 10 in the depth direction.
Then, for each position of the retaining wall 10, the measured behavior value A
Is compared with the values of the first management value R1 and the second management value R2 at the position. If A ≦ R2 is satisfied in step S16, then the measured behavior value A is plotted in yellow in step S18. When the processing in step S14 or S16 ends, the processing in step S22 is executed next. On the other hand, when A> R2 is satisfied in step S16, the measured behavior value A is plotted in red in step S20. In this case, the operator determines that sufficient safety of the excavation work cannot be ensured, and suspends the execution of this routine.
Measures such as reinforcement can be taken. Note that examples of display screens on which the measured behavior values A are plotted are shown in FIGS. 8 and 9 described later.

In step S22, from the measured behavior value A,
A process of estimating the value of each unknown parameter of the ground in each soil layer by inverse analysis is executed. Therefore, each parameter value of each soil layer is updated each time the main program is executed (that is, each time one excavation process is completed). The processing in step S22 will be described later in detail.

In step S24 subsequent to step S22, using a well-known forward analysis method, based on the estimated values of the unknown parameters, the retaining in the next excavation step (that is, the excavation step of the excavation layer i + 1). A predicted calculated value of the behavior value of the wall 10 (hereinafter, referred to as a calculated behavior value B) is obtained.

In step S26, a predicted value of the load acting on the girder 16 (hereinafter referred to as girder load F) is calculated based on the calculated behavior value B obtained in step S24.
In addition, each behavior value of the retaining wall 10 and the girder load F correspond to “the behavior value representing the behavior of the retaining frame” in the present invention.

In step S28, the predicted values of the calculated behavior value B and the traverse load F obtained in steps S24 and S26 are plotted on the screen of the display device 20b. When the processing in step S28 ends, the execution of the current program ends.

Next, the process of estimating the value of each unknown parameter by the inverse analysis in step S22 will be described. FIG. 4 is a flowchart of a subroutine executed in step S18. When the subroutine shown in FIG. 4 is started, first, the process of step 50 is executed.

In step 50, for each soil layer, unknown parameters such as earth pressure P, ground reaction force coefficient ke, ground adhesive force C, ground friction angle φ, ground volume weight γ, rigidity of earth retaining wall An initial value and a membership function are set for each of Kw and the cutting beam spring coefficient ks. FIG.
Shows an example of a membership function. As shown in FIG. 5, the membership function has an initial value X0 of each parameter.
Takes a maximum value of 1.0, and the parameter value is an initial value X
It is set so as to gradually decrease from 0 toward the minimum value min and the maximum value max. That is, the initial value X0 is a value considered most probable as the value of each unknown parameter in each soil layer, and the value of the membership function indicates the likelihood of the value of each unknown parameter and an initial value of 1.0. It has been expressed as. In the example shown in FIG. 5, the membership function is an isosceles triangle, but is not limited to this, and may be, for example, a normal distribution function.

In step S52 following step S50, the amount of change δ when the value of each unknown parameter is changed on the membership function is determined.

In step S54, the value of each unknown parameter is set as an initial value X0, and the calculated behavior value B is calculated by forward analysis.
Is required. Thereafter, as described below, in step S56 and thereafter, the calculation is repeatedly performed while appropriately increasing or decreasing the value of each unknown parameter until a calculated behavior value B substantially matching the actually measured behavior value A is obtained.

In step S56, it is determined whether or not the measured behavior value A is equal to or less than the calculated behavior value B. As a result, A
If ≦ B is satisfied, in step S58, a process of changing the value of each unknown parameter so that the calculated behavior value B decreases. On the other hand, when A ≦ B is not satisfied, in step S60, a process of changing the value of each unknown parameter so that the calculated behavior value B increases.

The processing in steps S56 to S60 is executed for each soil layer, and the comparison and discrimination processing in step 56 is performed based on the integrated value of the measured behavior value A and the calculated behavior value B in each soil layer. For example, measured behavior value A
It is assumed that the calculated behavior value B is obtained for the soil layers 1 to 3 as shown in FIG. In this case, the displacement curve is obtained by complementing the measured behavior value A between the measurement points, and the integral value of this displacement curve in each soil layer is compared with the integral value of the calculated behavior value B in the same soil layer. In the case illustrated in FIG. 6, for the soil layers 1 and 3, since the integral value of the displacement curve is smaller than the integral value of the calculated behavior value B, step S
At 56, it is determined that the actually measured behavior value A is smaller than the calculated behavior value B. Also, for the soil layer 2, since the integrated value of the displacement curve is larger than the integrated value of the calculated behavior value B, step S
At 56, it is determined that the measured behavior value A is greater than the calculated behavior value B.

FIG. 7 shows steps S58 and S60.
FIG. 4 is a diagram showing a table referred to when changing the value of each unknown parameter. For example, as for the earth pressure P, the larger the value, the larger the calculated behavior value B obtained by the forward analysis. The larger the values of the reaction force coefficient ke, the adhesive force C, the friction φ, the volume weight γ, the stiffness Kw of the retaining wall, and the shear beam spring constant ks, the larger the calculated behavior obtained by the forward analysis. The value B decreases. Therefore, in the table shown in FIG.
Is larger than the measured behavior value A, the earth pressure P is decreased and the reaction force coefficient k is decreased so that the calculated behavior value B decreases.
e, adhesive force C, friction each φ, volume weight γ, stiffness Kw of retaining wall, and cutting beam spring constant ks should be increased, while calculated behavior value B is smaller than measured behavior value A Is to increase the earth pressure P and increase the reaction force coefficient ke, the adhesive force C, the friction φ, the volume weight γ, the stiffness Kw of the retaining wall, and the cutting beam spring constant ks so that the calculated behavior value B increases.
Has been shown to be reduced.

As described above, the direction of increasing or decreasing the value of each unknown parameter is determined by referring to the table shown in FIG. The increase / decrease amount of each unknown parameter is shown in FIG.
Is determined so that the value of the membership function changes by the change amount δ. For example, in FIG. 5, when the current value of the unknown parameter is the initial value X0 and it is determined that the value of this parameter should be increased, the value of this unknown parameter is changed to X1. Further, for example, when the current value of the unknown parameter is X2 and it is determined that the value of the unknown parameter should be reduced, the value of the unknown parameter is changed to X3.

When the processing in step S58 or S60 is completed, the processing in step S62 is executed.

In step S62, the above-mentioned step S58
Alternatively, a new calculated behavior value B of the retaining wall 10 is obtained by forward analysis using the values of the respective unknown parameters updated in S60. In a succeeding step S64, it is determined whether or not the calculation of the calculated behavior value B has converged, that is, whether or not the difference between the currently calculated calculated behavior value B and the previously calculated calculated behavior value B is equal to or smaller than a predetermined value. Is determined. As a result, if the calculation of the calculation behavior value B has not converged, step S is performed again.
The processing of 56 is executed. On the other hand, when the calculation of the calculation behavior value B has converged, the process of step S66 is next performed.

In step S66, it is determined whether or not the measured behavior value A and the current calculated behavior value B substantially match. Specifically, for example, the measured behavior value A and the calculated behavior value B
When the ratio of the integrated value of the difference | AB | to the integrated value of the actually measured behavior value A is equal to or smaller than a predetermined value (for example, 0.05), it is determined that the two values substantially match. Step S66
In, when a negative determination is made, it is determined that an appropriate estimated value of the unknown parameter has not been obtained. in this case,
Returning to step S50, the membership function is reset for each unknown parameter, and after the change amount δ is reset in step S52, the processes in step S54 and thereafter are executed again. On the other hand, if an affirmative determination is made in step S66, the current calculation value is determined as the calculation behavior value B in step S66, and then the current subroutine is terminated.

FIGS. 8 and 9 show examples of display screens on the display device 20b. FIG. 8 shows that a certain excavation process
m (the depth indicated by "GL-6.00" in the figure) is shown on the display screen, and FIG. 9 shows a depth of 9m ("GL-9.00 in the figure") by the next excavation step. At the time of excavation up to the depth indicated by ").

As shown in FIG. 8 and FIG.
b, the longitudinal axis is the depth direction of the retaining wall 10, and the beam load F, the displacement of the retaining wall 10, the stress,
And the distribution of the moment is displayed in a graph. As described above, for the displacement, stress, and moment, which are the behavior values of the earth retaining frame, the actually measured behavior value A is plotted with a circle of a color corresponding to the magnitude relationship between the primary control value R1 and the secondary control value R2. At the same time, each calculated behavior value B is displayed by a solid line. In addition, the primary control value R1 and the secondary control value R2 are also displayed for the girder load F, the displacement of the retaining wall 10, and the stress. However, the secondary control value R2 of the retaining wall 10 is not displayed because it is out of the range of the scale, and the moment corresponds to the stress one-to-one. Is not provided. Further, as for the stress of the retaining wall 10, values on both the excavation side and the back side are shown. On the actual screen, for example, the calculated behavior value B is displayed in blue, and the primary management value R1 and the secondary management value R2 are displayed in different colors such as yellow and red, respectively.

As can be seen from FIGS. 8 and 9, the calculated behavior value B shown in FIG. 8 (that is, the predicted value when excavating to a depth of 9 m by the following process when excavating to a depth of 6 m)
Is in good agreement with the measured behavior value A shown in FIG. As described above, in the system of the present embodiment, the behavior of the earth retaining frame in the subsequent excavation process can be predicted with high accuracy.

As described above, the measurement management system of the present embodiment uses the measured behavior values of the retaining wall 10 to measure the physical properties of the ground and the sectional rigidity of the retaining wall 10 before the excavation process of each excavation layer. The value of the unknown parameter is estimated, and the behavior of the earth retaining frame after the excavation process is predicted based on the estimated value. Then, the predicted value is displayed on the display device 20b installed at the construction site.
To be displayed. For this reason, it is possible to detect a situation in which the safety of the excavation work cannot be ensured beforehand, and to take countermeasures such as reinforcement of the retaining wall 10, so that the excavation work can be performed more safely.

The estimation of the value of the unknown parameter is a simple process of repeating the calculation of the calculated behavior value B while increasing or decreasing each parameter value according to the magnitude relationship between the actually measured behavior value A and the calculated behavior value B. Done in As the initial value of this iterative calculation, a value that is considered most probable for each parameter is used. For this reason, the estimation calculation of the unknown parameter can be quickly converged, and the behavior of the earth retaining frame can be predicted in a short time.

As described above, in the measurement management system of the present embodiment, the value of the section stiffness Kw of the retaining wall 10 is estimated by including it in the unknown parameter. For this reason, even when the structure of the retaining wall 10 is complicated and it is difficult to accurately determine the sectional rigidity in advance, the behavior of the retaining frame can be predicted with high accuracy. Also, for each soil layer,
Since the section rigidity Kw of the earth retaining wall 10 is estimated, even when the section rigidity Kw changes along the depth direction of the earth retaining wall 10, the value can be appropriately estimated. The behavior of the retaining frame can be predicted with high accuracy.

In the above embodiment, when estimating the value of the unknown parameter, a membership function is set for each unknown parameter, and the value of each parameter is changed so that the membership function changes by the change amount δ. It was made to be. However, the present invention is not limited to this, and the value of each unknown parameter may be directly changed by a predetermined value.

[0049]

As described above, according to the first, fifth and ninth aspects of the present invention, even if the characteristics of the retaining wall cannot be accurately known in advance, the behavior of the retaining frame can be improved. Can be predicted with high accuracy.

According to the second, fifth and tenth aspects of the present invention, the value of the unknown parameter is calculated by a simple iterative calculation process of calculating the behavior value of the earth retaining frame while increasing or decreasing the value of the unknown parameter. Can be estimated.

According to the third, sixth and eleventh aspects of the present invention, the unknown parameter is referred to by referring to a relation table showing the relationship between the increase and decrease of the value of the unknown parameter and the increase and decrease of the behavior value of the earth retaining frame. Can quickly converge the iterative calculation for estimating.

Further, according to the inventions described in claims 4 and 7, the predicted value of the behavior of the earth retaining frame is displayed at the excavation work site. Measures can be taken according to the requirements. For this reason, excavation work can be performed more efficiently and safely.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a situation of a retaining digging work to which a measurement management system for retaining digging according to an embodiment of the present invention is applied.

FIG. 2 is a schematic configuration diagram of a measurement management system according to the present embodiment.

FIG. 3 is a flowchart of a main program executed by a computer in the embodiment.

FIG. 4 is a flowchart of a subroutine program for obtaining the value of each unknown parameter by back analysis in the main program.

FIG. 5 is a diagram illustrating an example of a membership function set for each unknown parameter.

FIG. 6 is a diagram showing an example of measured behavior values A and calculated behavior values B obtained for each excavation layer.

FIG. 7 is a table referred to when changing the value of each unknown parameter in the estimation calculation of the unknown parameter.

FIG. 8 is a diagram showing an example of a display screen on a monitor device in a certain excavation step.

9 is a diagram illustrating an example of a display screen on a monitor device in an excavation process subsequent to the excavation process illustrated in FIG. 8;

[Explanation of symbols]

 12 inclinometer 14 strain gauge 20 computer 20b monitor device 20d recording medium

Claims (11)

[Claims] 1. A measurement management method at the time of earth retaining excavation for predicting behavior of the earth retaining frame in a subsequent excavation process during excavation work using the earth retaining frame, wherein the behavior of the earth retaining frame is represented. A behavior detection step of detecting a behavior value; a parameter estimation step of estimating a value of an unknown parameter including a property value of a ground to be excavated and a characteristic value of a retaining wall based on the detected behavior value; A behavior prediction step of predicting and calculating a behavior value of the earth retaining frame in a subsequent excavation process based on the obtained unknown parameter value. 2. The parameter estimation step includes: a behavior calculation step of calculating a behavior value of the earth retaining frame using a given value as the value of the unknown parameter; and a behavior value calculated in the behavior calculation step. A recalculation step of executing the calculation step after increasing or decreasing the value of the unknown parameter by a predetermined value in accordance with the magnitude relation with the detected behavior value, and a behavior value calculated in the behavior calculation step And an estimated value determining step of determining the value of the unknown parameter used for calculating the behavior value as the estimated value when the detected behavior value substantially matches the detected behavior value. Item 1. The measurement management method at the time of earth retaining excavation according to item 1. 3. For each of the unknown parameters, a correspondence between an increase or decrease in the value of the unknown parameter and an increase or decrease in the behavior value of the earth retaining frame is determined in advance, and in the recalculating step, based on the correspondence. And determining the increasing / decreasing direction of each unknown parameter such that the calculated behavior value approaches the detected behavior value.
Measurement management method at the time of earth retaining excavation described. 4. The measurement at the time of earth retaining excavation according to claim 1, further comprising a step of displaying a predicted calculated value in the behavior estimating step at an excavation work site. Management method. 5. A measurement management system at the time of earth retaining excavation for predicting behavior of the earth retaining frame in a subsequent excavation process during excavation work using the earth retaining frame, wherein the behavior management system represents the behavior of the earth retaining frame. A behavior detecting means for detecting a behavior value; a parameter estimating means for estimating a value of an unknown parameter including a property value of a ground to be excavated and a characteristic value of a retaining wall based on the detected behavior value; And a behavior predicting means for predicting and calculating a behavior value of the earth retaining frame in a subsequent excavation process based on the value of the obtained unknown parameter. 6. The parameter estimating means includes: a behavior calculating means for calculating a behavior value of the earth retaining frame by using a given value as the value of the unknown parameter; Re-calculating means for calculating by the behavior calculating means after increasing or decreasing the value of the unknown parameter by a predetermined value, respectively, in accordance with the magnitude relationship with the behavior value, When the behavior value substantially matches the detected behavior value, an estimated value determination unit that determines the value of the unknown parameter used for calculating the behavior value as an estimated value thereof, The measurement management system at the time of earth retaining excavation according to claim 5. 7. The recalculating means holds a correspondence relationship between an increase or decrease in the value of the unknown parameter and an increase or decrease in the behavior value of the earth retaining frame for each of the unknown parameters,
3. The measurement management during earth retaining excavation according to claim 2, wherein the increasing / decreasing direction of each unknown parameter is determined based on the correspondence so that the calculated behavior value approaches the detected behavior value. system. 8. The measurement management at the time of earth retaining excavation according to claim 5, further comprising means for displaying a predicted value calculated by the behavior predicting means at an excavation site. system. 9. A recording recording a program for realizing a measurement management system at the time of excavation by a computer for predicting the behavior of the earth retaining frame in a subsequent excavation process during excavation work using the earth retaining frame. A medium, a behavior detection procedure for detecting a behavior value representing the behavior of the earth retaining frame, and based on the detected behavior value, including a physical property value of the ground to be excavated and a characteristic value of the earth retaining wall. A parameter estimation procedure for estimating the value of the unknown parameter; and a behavior prediction procedure for predicting and calculating a behavior value of the earth retaining frame in a subsequent excavation process based on the estimated unknown parameter value. Recording medium on which the program of the above is recorded. 10. The parameter estimation step includes: a behavior calculation step of calculating a behavior value of the earth retaining frame using a given value as each value of the unknown parameter; and the calculated behavior value and the detection. A re-calculation procedure for executing the calculation procedure after increasing or decreasing the value of each of the unknown parameters by a predetermined value in accordance with the magnitude relationship with the calculated behavior value, and the calculated behavior value and the detected 10. A parameter determination procedure for determining the value of the unknown parameter used for calculating the behavior value as an estimated value when the difference from the behavior value is equal to or less than a predetermined value.
A recording medium on which the program described above is recorded. 11. The program further includes, for each of the unknown parameters, a step of inputting, to a computer, a correspondence relationship between an increase or a decrease in the value of the unknown parameter and an increase or a decrease in the behavior value of the earth retaining frame. 11. The recording method according to claim 10, wherein a direction of increase / decrease of each unknown parameter is determined based on the correspondence relationship so that the calculated behavior value approaches the detected behavior value. Medium.