JP4389316B2 - Measurement management method during earth retaining excavation, measurement management system during earth retaining excavation, and recording medium recording a computer program for realizing the measurement management system during earth retaining excavation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a measurement management system and a measurement management method during earth retaining excavation, and more particularly, to a measurement management system and a measurement management method capable of predicting the behavior of a earth retaining frame with high accuracy.
[0002]
[Prior art]
Conventionally, in excavation work performed when building underground structures such as vertical piles, subways, and structure foundations, the construction of earth retaining walls prior to excavation prevents the excavation surface from collapsing and The adverse effects on the surroundings due to subsidence are minimized. As excavation works proceed, the retaining wall undergoes behavior such as deformation and stress according to the ground physical properties (earth pressure, reaction force coefficient, adhesive force, friction angle, volume weight, etc.). However, since the ground physical property values vary widely, it is difficult to accurately predict the behavior of the retaining wall based on the ground physical property values given in advance.
[0003]
On the other hand, the present applicant, in Japanese Patent Application Laid-Open No. 10-331161, estimates the ground physical property value from the measured value of the behavior of the retaining frame, and uses the estimated value to determine the retaining wall during excavation work. We have proposed a behavior prediction method that can accurately estimate behavior in a short time. In this method, the soil physical property value such as soil pressure, ground reaction force coefficient, ground adhesive force, ground friction angle, ground volume weight, etc. and the parameters of the beam spring coefficient are maximized at predetermined initial values. A membership function like this is set. Then, the behavior of the retaining wall is calculated while changing the value of each parameter on the membership function, and the value when it substantially matches the measured behavior of the retaining wall is used as the final value of each parameter. .
[0004]
[Problems to be solved by the invention]
By the way, the behavior of the earth retaining frame greatly depends not only on the ground property value and the beam spring constant but also on the characteristics of the earth retaining wall (for example, cross-sectional 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 is difficult to predict the behavior of the retaining frame with high accuracy.
[0005]
The present invention has been made in view of the above points, and even when it is difficult to accurately obtain the characteristics of the retaining wall in advance, the behavior of the retaining frame can be predicted with high accuracy during excavation work. It is an object of the present invention to provide a measurement management method and a measurement management method system for possible earth retaining excavation.
[0006]
[Means for Solving the Problems]
The above object is a measurement management method during earth retaining excavation for predicting the behavior of the earth retaining frame in a subsequent excavation process during excavation work using the earth retaining frame, as described in claim 1. A behavior detection step for detecting a behavior value representing the behavior of the retaining frame, and estimation of unknown parameter values including the physical property value of the excavated ground and the characteristic value of the retaining wall based on the detected behavior value And a behavior prediction step of predicting and calculating a behavior value of the retaining frame in a subsequent excavation process based on the estimated unknown parameter value, and the parameter estimation step includes the unknown parameter A behavior calculation step of calculating a behavior value of the retaining frame using a given value as a value of the behavior, a behavior value calculated in the behavior calculation step, and the detected behavior value, A recalculation step for executing the calculation step after increasing or decreasing the value of the unknown parameter by a predetermined value according to the magnitude relationship of the behavior, the behavior value calculated in the behavior calculation step, and the detected behavior value And an estimated value confirming step for confirming the value of the unknown parameter used in the calculation of the behavior value as an estimated value when each of the unknown parameters is substantially the same. The correlation between the increase / decrease and the increase / decrease in the behavior value of the earth retaining frame is obtained in advance, and in the recalculation step, the calculated behavior value approaches the detected behavior value based on the correspondence relationship. It is achieved by the measurement management method during braced excavation that determine the increase or decrease direction of the unknown parameters so.
[0007]
According to the first aspect of the present invention, the unknown parameter value 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 structure is predicted and calculated based on the estimated value. For this reason, even when the characteristics of the retaining wall cannot be obtained accurately in advance, the behavior of the retaining frame can be predicted with high accuracy. As the behavior value of the retaining frame, for example, the displacement, stress, and moment of the retaining wall and the load acting on the support can be used, and as the characteristic value of the retaining wall, for example, the retaining wall The cross-sectional stiffness of the wall can be used.
Also, based on the magnitude relationship between the calculated behavior value and the detected behavior value, the behavior value of the earth retaining frame is calculated while increasing / decreasing the value of the unknown parameter. The value can be estimated.
Further, referring to a relationship table showing the relationship between the increase / decrease in the value of the unknown parameter and the increase / decrease in the behavior value of the retaining frame, each unknown parameter is adjusted so that the calculated behavior value approaches the detected behavior value. Since the increase / decrease direction is determined, iterative calculation for estimating the unknown parameter can be quickly converged.
[0014]
Incidentally, the invention of claim 2 is according to the system to perform the method described in 請 Motomeko 1.
[0015]
According to a third aspect of the present invention, there is provided a recording medium on which a program for realizing a measurement management system for earth retaining excavation by a computer is recorded.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic cross-sectional view showing a situation of earth retaining excavation work to which a measurement management system for earth retaining excavation according to an embodiment of the present invention is applied. In the earth retaining excavation work shown in FIG. 1, after the earth retaining wall 10 is constructed before starting excavation, excavation is performed to a predetermined depth by a plurality of excavation steps. The excavation layer excavated by the i-th excavation step is represented by excavation layer i (i = 1, 2, 3,...). FIG. 1 shows a state where excavation of the excavation layer 1 is completed. In addition, in FIG. 1, the soil layers 1 to 4 divided on the basis of soil investigation results and the like are indicated by broken lines.
[0017]
As shown in FIG. 1, when excavation of the excavation layer 1 is completed, after the cut beam 16 is provided as a support work on the retaining wall 10, the excavation layer 2 is subsequently excavated. Thereafter, similarly, every time the excavation of each excavation layer is completed, after the cut beams 16 are provided on the retaining wall 10, the excavation of the next excavation layer is performed.
[0018]
The earth 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 earth retaining wall 10 from the vertical direction. The strain gauges 14 are provided as a pair on the excavation surface and the back surface of the retaining wall 10, and output a signal corresponding to the magnitude of strain generated on each surface of the retaining wall 10. The predetermined interval is set so that the tilt angle and strain can be detected by at least one location of each excavation layer i by the inclinometer 12 and the strain gauge 14.
[0019]
FIG. 2 is a schematic configuration diagram of the measurement management system of the present embodiment. This measurement management system is all installed at the excavation site. As shown in FIG. 2, the measurement management system includes a computer 20. The computer 20 includes a central processing unit 20a, a display device 20b, and a recording medium reading drive device 20c. The inclinometer 12 and the strain gauge 14 described above are connected to the central processing unit 20a of the computer 20. Each time the excavation of each excavation layer is completed, the central processing unit 20a, based on the output signals of the inclinometer 12 and the strain gauge 14, the horizontal displacement, stress, and moment (hereinafter referred to as “the retaining wall 10”). The behavior value of the retaining wall 10 is generically detected). Then, as will be described in detail below, based on the detected behavior values, the physical property values of the ground in each excavation layer (that is, earth pressure P, ground reaction force coefficient ke, ground adhesion C, ground friction) The angle φ, the volume weight γ of the ground, the cross-sectional rigidity Kw of the retaining wall 10 and the spring constant ks of the cut beam 16 are estimated, and the behavior value after the next excavation process is predicted and calculated based on the estimated values. Displayed on the display device 20b. Hereinafter, the physical property values P, ke, C, φ, γ of the ground, the cross-sectional rigidity Kw of the retaining wall 10 and the spring constant ks of the cut beam 16 are collectively referred to as unknown parameters. In addition, although the spring constant of the cut beam 16 itself can be determined in advance, the substantial spring constant of the cut beam 16 changes due to the looseness of the attachment portion to the retaining wall 10 or the like, and the value becomes uncertain. The spring constant ks of the cut beam 16 is a value including uncertain elements such as looseness of the attachment portion.
[0020]
The measurement management system of the present embodiment is particularly characterized in that the cross-sectional rigidity of the earth retaining wall 10 is included in the unknown parameter and the value is estimated together with the ground characteristic value and the like. As a result, even when the structure of the earth retaining wall 10 is complicated and it is difficult to accurately determine its cross-sectional rigidity, or when the cross-sectional rigidity changes according to the depth, the behavior of the earth retaining frame is reduced. It becomes possible to predict with high accuracy.
[0021]
The above functions are realized by the computer 20 executing a predetermined program. Hereinafter, the contents of a program executed by the computer 20 to realize the above functions in the present system will be described.
[0022]
FIG. 3 is a flowchart of a main program executed by the computer 20 in the present 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. 3 and 4 are 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, and the program is shown in FIG. 20 reads and executes the program from the recording medium 20d via the recording medium reading drive device 20c. 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.
[0023]
First, the contents of the main program will be described with reference to FIG. The main program is executed when the operator performs an instruction operation to 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 activated, the process of step S10 is first executed.
[0024]
In step S10, based on the output signals of the inclinometer 12 and the strain gauge 14, actual measured values of behavior values at the respective positions of the retaining wall 10 (hereinafter referred to as measured behavior values A) are obtained.
[0025]
In step S12, it is determined whether or not the actually measured behavior value A is equal to or less than the first management value R1. As a result, if A ≦ R1 holds, the measured behavior value A is plotted in light blue on the screen of the display device 20b in step S14. If A ≦ R1 is not established in step S12, it is then determined in step S16 whether or not the actually measured behavior value A is equal to or less than the second management value R2 (> R1).
[0026]
The first management value R1 and the second management value R2 are set as function values corresponding to the position of the retaining wall 10 in the depth direction. In steps S12 and S16, each position of the retaining wall 10 is set. The measured behavior value A is compared with the first management value R1 and the second management value R2 at the position. If A ≦ R2 is satisfied in step S16, then the actually measured behavior value A is plotted in yellow in step S18. When the process of step S14 or S16 ends, the process of step S22 is executed next. On the other hand, if A> R2 is satisfied in step S16, the actually measured behavior value A is plotted in red in step S20. In this case, the operator can determine that sufficient safety of the excavation work cannot be ensured, stop the execution of this routine, and perform countermeasure work such as reinforcement of the retaining wall 10. Examples of display screens on which the measured behavior values A are plotted are shown in FIGS. 8 and 9 described later.
[0027]
In step S22, a process of estimating the value of each unknown parameter of the ground in each soil layer from the actually measured behavior value A by inverse analysis is executed. Therefore, each parameter value of each soil layer is updated every time the main program is executed (that is, every time one excavation process is completed). The process in step S22 will be described in detail later.
[0028]
In step S24 following step S22, the retaining wall 10 in the next excavation process (that is, excavation process of the excavation layer i + 1) is determined based on the value of each unknown parameter estimated using a known forward analysis method. A predicted calculated value of the behavior value (hereinafter referred to as a calculated behavior value B) is obtained.
[0029]
In step S26, based on the calculated behavior value B obtained in step S24, a predicted value of a load acting on the cut beam 16 (hereinafter referred to as a cut beam load F) is calculated. Each behavior value of the retaining wall 10 and the beam load F correspond to the “behavior value representing the behavior of the retaining frame” in the present invention.
[0030]
In step S28, the calculated behavior value B and the predicted value of the beam load F obtained in steps S24 and S26 are plotted on the screen of the display device 20b. When the process of step S28 ends, the execution of the current program ends.
[0031]
Next, the process of estimating the value of each unknown parameter by 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.
[0032]
In step 50, for each soil layer, earth pressure P, which is an unknown parameter, ground reaction force coefficient ke, ground adhesive force C, ground friction angle φ, ground volume weight γ, retaining wall stiffness Kw, and The initial value and the membership function are set for each of the beam spring coefficients ks. FIG. 5 shows an example of the membership function. As shown in FIG. 5, the membership function has a maximum value of 1.0 at the initial value X0 of each parameter, and is set so that the parameter value gradually decreases from the initial value X0 toward the minimum value min and the maximum value max. ing. That is, the initial value X0 is a value that is most likely to be the value of each unknown parameter in each soil layer, and the value of the membership function is the probability of the value of each unknown parameter, and the initial value is 1.0. It is what was expressed as. In the example shown in FIG. 5, the membership function is an isosceles triangle, but is not limited thereto, and may be a normal distribution function, for example.
[0033]
In step S52 following step S50, a change amount δ when changing the value of each unknown parameter on the membership function is determined.
[0034]
In step S54, the calculation behavior value B is obtained by forward analysis calculation using the value of each unknown parameter as the initial value X0. Thereafter, as described below, in step S56 and subsequent steps, the calculation is repeated until the calculated behavior value B substantially matching the measured behavior value A is obtained while appropriately increasing or decreasing the value of each unknown parameter.
[0035]
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, when A ≦ B is satisfied, in step S58, processing for changing the value of each unknown parameter is executed so that the calculated behavior value B becomes small. On the other hand, if A ≦ B is not established, in step S60, a process of changing the value of each unknown parameter is executed so that the calculated behavior value B increases.
[0036]
Note that the processing in steps S56 to S60 is executed for each soil layer, and the comparison / determination processing in step 56 is performed based on the integral value of the measured behavior value A and the calculated behavior value B in each soil layer. For example, it is assumed that the measured behavior value A and the calculated behavior value B are obtained for the soil layers 1 to 3 as shown in FIG. In this case, with respect to the actually measured behavior value A, the displacement curve is obtained by interpolating between the measurement points, and the integrated value of each displacement layer of this displacement curve is compared with the integrated value of the calculated behavior value B in the same soil layer. In the case illustrated in FIG. 6, since the integrated value of the displacement curve is smaller than the integrated value of the calculated behavior value B for the soil layer 1 and the soil layer 3, the actually measured behavior value A is smaller than the calculated behavior value B in step S56. Further, 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, it is determined that the actually measured behavior value A is larger than the calculated behavior value B in step S56.
[0037]
FIG. 7 is a diagram showing a table referred to when changing the value of each unknown parameter in steps S58 and S60. For example, for earth pressure P, the greater the value, the greater the calculated behavior value B determined by forward analysis. In addition, with respect to the reaction force coefficient ke, the adhesive force C, each friction φ, the volume weight γ, the retaining wall stiffness Kw, and the beam spring constant ks, the larger these values are, the greater the calculation behavior obtained by forward analysis. The value B decreases. For this reason, in the table shown in FIG. 7, when the calculated behavior value B is larger than the actually measured behavior value A, the earth pressure P is decreased and the reaction force coefficient ke and the adhesive force C are reduced so that the calculated behavior value B decreases. , Friction φ, volume weight γ, retaining wall stiffness Kw, and beam spring constant ks should be increased. On the other hand, if the calculated behavior value B is smaller than the measured behavior value A, the calculated behavior value The earth pressure P should be increased and the reaction force coefficient ke, the adhesion force C, each friction φ, the volume weight γ, the retaining wall rigidity Kw, and the beam spring constant ks should be decreased so that B increases. It is shown that there is.
[0038]
In this way, by referring to the table shown in FIG. 7, the increasing / decreasing direction of the value of each unknown parameter is determined. The increase / decrease amount of each unknown parameter is determined so that the value of the membership function changes by the change amount δ, as shown in FIG. For example, in FIG. 5, when the current unknown parameter value is the initial value X0 and it is determined that the parameter value should be increased, the unknown parameter value is changed to X1. Also, for example, when the current unknown parameter value is X2, and it is determined that the unknown parameter value should be decreased, the unknown parameter value is changed to X3.
[0039]
When the process of step S58 or S60 ends, the process of step S62 is then executed.
[0040]
In step S62, a new calculated behavior value B of the retaining wall 10 is obtained by forward analysis using the values of the unknown parameters updated in step S58 or S60. In the subsequent step S64, whether or not the calculation of the calculation behavior value B has converged, that is, whether or not the difference between the calculation behavior value B calculated this time and the calculation behavior value B calculated last time is equal to or less than a predetermined value. Is determined. As a result, if the calculation of the calculation behavior value B has not converged, the process of step S56 is executed again. On the other hand, if the calculation of the calculation behavior value B has converged, the process of step S66 is executed next.
[0041]
In step S66, it is determined whether or not the actually measured behavior value A and the current calculated behavior value B substantially match. Specifically, for example, the ratio of the integrated value of the difference | A−B | between the measured behavior value A and the calculated behavior value B to the integrated value of the measured behavior value A is a predetermined value (for example, 0.05) or less. In this case, it is determined that the two are substantially the same. If a negative determination is made in step S66, it is determined that a proper estimated value of the unknown parameter has not been obtained. In this case, the process returns to step S50, the membership function is reset for each unknown parameter, and after the amount of change δ is reset in step S52, the processes in and after step S54 are executed again. On the other hand, if an affirmative determination is made in step S66, the current subroutine is terminated after the current calculated value is determined as the calculated behavior value B in step S66.
[0042]
8 and 9 show examples of display screens on the display device 20b. FIG. 8 shows a display screen at the time of excavation to a depth of 6 m (depth indicated by “GL-6.00” in the figure) by a certain excavation process, and FIG. 9 shows the depth by the next excavation process. The display screen at the time of excavation up to 9 m (depth indicated by “GL-9.00” in the figure) is shown.
[0043]
As shown in FIGS. 8 and 9, the display device 20 b has the vertical axis as the depth direction of the retaining wall 10, and the beam load F, displacement, stress, and moment of the retaining wall 10 in order from the left side of the screen. The distribution of 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 measured behavior value A is plotted with a circle mark according to the magnitude relationship between the primary management value R1 and the secondary management value R2. In addition, each calculated behavior value B is displayed with a solid line. Further, for the beam load F, the displacement of the retaining wall 10 and the stress, the primary management value R1 and the secondary management value R2 are also displayed. However, the secondary management 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, regarding the stress of the retaining wall 10, values on both the excavation side and the back side are shown. In 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.
[0044]
As can be seen from FIG. 8 and FIG. 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 next step when excavating to a depth of 6 m) is shown in FIG. It is in good agreement with the measured behavior value A shown. Thus, in the system of this embodiment, it is possible to predict the behavior of the earth retaining frame in the subsequent excavation process with high accuracy.
[0045]
As described above, the measurement management system according to the present embodiment uses the measured behavior value of the retaining wall 10 before the excavation process of each excavation layer to determine unknown parameters such as the physical property value of the ground and the cross-sectional rigidity of the retaining wall 10. And the behavior of the 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. For this reason, it is possible to detect in advance a situation where the safety of excavation work cannot be ensured, and to perform countermeasures such as reinforcement of the retaining wall 10, and the excavation work can be proceeded more safely.
[0046]
Further, the unknown parameter value is estimated by 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 measured behavior value A and the calculated behavior value B. . Further, the most probable value of each parameter is used as the initial value of this iterative calculation. For this reason, the estimation calculation of the unknown parameter can be quickly converged, and the behavior of the retaining frame can be predicted in a short time.
[0047]
As described above, in the measurement management system of the present embodiment, in particular, the value is estimated by including the cross-sectional rigidity Kw of the retaining wall 10 as an unknown parameter. For this reason, even when the structure of the retaining wall 10 is complicated and it is difficult to accurately obtain the sectional rigidity in advance, the behavior of the retaining frame can be predicted with high accuracy. Moreover, since the cross-sectional rigidity Kw of the retaining wall 10 is estimated for each soil layer, even when the sectional rigidity Kw changes along the depth direction of the retaining wall 10, the value is appropriately estimated. Thus, the behavior of the earth retaining frame can be predicted with high accuracy.
[0048]
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. did. 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]
【The invention's effect】
As described above, according to the present invention, the behavior of the retaining frame can be predicted with high accuracy even when the characteristics of the retaining wall cannot be accurately known in advance.
[0050]
Further, it is possible to estimate the value of the unknown parameters while decreasing the value of the unknown parameters, a simple repetitive calculation process of calculating the behavior values of the earth retaining Frames.
[0051]
Furthermore, it is possible to quickly converge the iterative calculation for estimating the unknown parameter by referring to a relational table showing the relationship between the increase / decrease in the value of the unknown parameter and the increase / decrease in the behavior value of the retaining frame.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic cross-sectional view showing a situation of earth retaining excavation work to which a measurement management system for earth retaining excavation according to an embodiment of the present invention is applied.
FIG. 2 is a schematic configuration diagram of a measurement management system of the present embodiment. FIG. 3 is a flowchart of a main program executed by a computer in the present 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. FIG. 5 is a diagram showing an example of a membership function set for each unknown parameter.
FIG. 6 is a diagram showing an example of measured behavior value A and calculated behavior value B obtained for each excavated layer.
FIG. 7 is a table that is referred to when changing the value of each unknown parameter in an unknown parameter estimation calculation.
FIG. 8 is a diagram showing an example of a display screen on a monitor device in a certain excavation process.
9 is a diagram showing an example of a display screen on the monitor device in the excavation process next to the excavation process shown in FIG. 8. FIG.
[Explanation of symbols]
12 Inclinometer 14 Strain meter 20 Computer 20b Monitor device 20d Recording medium

Claims (3)

A method of measuring and managing during earth retaining excavation to predict the behavior of the earth retaining frame in a subsequent excavation process during excavation work using the earth retaining frame,
A behavior detection step of detecting a behavior value representing the behavior of the earth retaining frame;
A parameter estimation step for estimating a value of an unknown parameter including a physical property value of the excavated ground and a characteristic value of the retaining wall based on the detected behavior value;
A behavior prediction step for predicting and calculating a behavior value of the retaining frame in a subsequent excavation process based on the estimated unknown parameter value ,
The parameter estimation step includes:
A behavior calculation step of calculating a behavior value of the retaining frame using a given value as the value of the unknown parameter;
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 relationship between the behavior value calculated in the behavior calculation step and the detected behavior value; ,
An estimated value determining step for determining the value of the unknown parameter used for calculating the behavior value as an estimated value when the behavior value calculated in the behavior calculating step and the detected behavior value substantially coincide with each other; Including,
For each of the unknown parameters, a correspondence relationship between the increase / decrease in the value of the unknown parameter and the increase / decrease in the behavior value of the retaining frame is obtained in advance, and in the recalculation step, the calculation is performed based on the correspondence relationship. behavior values the detected behavior metering management methods during braced excavation characterized that you determine the increase or decrease direction of the unknown parameters so as to approach the. A measurement management system during earth retaining excavation for predicting the behavior of the earth retaining frame in a subsequent excavation process during excavation work using the earth retaining frame,
Behavior detecting means for detecting a behavior value representing the behavior of the earth retaining frame;
Parameter estimation means for estimating values of unknown parameters including physical property values of excavated ground and characteristic values of retaining walls based on the detected behavior values;
A behavior prediction means for predicting and calculating a behavior value of the earth retaining frame in a subsequent excavation process based on the estimated unknown parameter value ;
The parameter estimation means includes
Behavior calculating means for calculating a behavior value of the retaining frame using a given value as the value of the unknown parameter,
Recalculation means for performing calculation by the behavior calculation means after increasing or decreasing the value of the unknown parameter by a predetermined value in accordance with the magnitude relationship between the calculated behavior value and the detected behavior value. When,
Estimated value determining means for determining the value of the unknown parameter used for calculating the behavior value as the estimated value when the behavior value calculated by the behavior calculating means substantially matches the detected behavior value. And including
The recalculation means holds a correspondence relationship between an increase / decrease in the value of the unknown parameter and an increase / decrease in the behavior value of the retaining frame for each of the unknown parameters, and the calculation is performed based on the correspondence relationship. measurement management system at earth retaining excavation behavior value, characterized that you determine the increase or decrease direction of the unknown parameters so as to approach the detected behavior value. A recording medium recording a program for realizing by a computer a measurement management system during earth retaining excavation for predicting the behavior of the earth retaining frame in a subsequent excavation process during excavation work using the earth retaining frame,
The program is
A behavior detection procedure for detecting a behavior value representing the behavior of the earth retaining frame;
A parameter estimation procedure for estimating values of unknown parameters including physical property values of excavated ground and characteristic values of the retaining wall based on the detected behavior values;
Based on the estimated unknown parameter value, the computer executes a behavior prediction procedure for predicting and calculating the behavior value of the retaining frame in a subsequent excavation process,
The parameter estimation procedure includes:
A behavior calculation procedure for calculating a behavior value of the retaining frame using a given value as a value of each of the unknown parameters;
A recalculation procedure for executing the calculation procedure after increasing or decreasing the value of the unknown parameter by a predetermined value according to the magnitude relationship between the calculated behavior value and the detected behavior value;
A parameter determination procedure for determining, as an estimated value, the value of the unknown parameter used for calculating the behavior value when a difference between the calculated behavior value and the detected behavior value is equal to or less than a predetermined value; Including
The program further includes, for each of the unknown parameters, a procedure for inputting a correspondence relationship between an increase / decrease in the value of the unknown parameter and an increase / decrease in the behavior value of the retaining frame to a computer,
And in the recalculation procedure, based on the correspondence relation, records the calculated behavior value was recorded program characterized that you determine the increase or decrease direction of the unknown parameters so as to approach the detected behavior value Medium.

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