JP2012255320A - Computerized construction device and computerized construction program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a computerized construction device and a computerized construction program, which enable rational countermeasure work to be selected in construction of a ground structure.SOLUTION: A computerized construction device intended for a ground structure performs an inverse analysis, based on an experimental design method using an orthogonal table, for a plurality of parameters of an inverse analysis object associated with the construction of the ground structure. Thus, the computerized construction device determines each of values of the plurality of parameters so that each measured value obtained by measuring stress and/or deformation on a job site where the ground structure is constructed and each analytical value corresponding to each measured value can be matched to each other, predicts an influence, which is brought by the construction of the ground structure, by using each of the determined values of the plurality of parameters, and selects countermeasure work so as to reduce the predicted influence.

Description

  The present invention relates to an information construction apparatus and an information construction program for a ground structure.

  For example, when constructing a tunnel as a ground structure, if there are important structures (for example, water pipes, gas pipes) buried in the ground around the tunnel, or structures such as private houses or steel towers are installed on the ground surface May have been. In such a case, it is possible to predict the impact of tunnel construction on these surrounding structures in advance, and implement reasonable measures to ensure the soundness (maintenance) of the surrounding structures as necessary. It has been demanded.

  In general, the influence of tunnel construction on surrounding structures is often predicted using a finite element method (FEM). Predicted values by the finite element method depend on the ground physical property values (parameters) to be input. However, since the ground is inhomogeneous and uncertain nature itself, the ground physical property values should be obtained accurately from the preliminary soil test results alone. I can't. Therefore, during tunnel construction, review the physical properties of the ground using measurement data during construction, and select the most economical countermeasure work that reduces the impact on the tunnel and surrounding structures during tunnel construction. Information-oriented construction is being carried out.

  The analysis technique that is the core of this tunnel informatization is reverse analysis. This reverse analysis is based on the ground where the measurement result of the displacement meter installed in the tunnel or the surrounding ground or on the ground surface, the stress measurement result of various support members installed in the tunnel, and the analysis value by FEM analysis are consistent. This is an analysis technology that automatically searches for physical property values using an optimization method. The soil physical properties include unit volume weight, deformation coefficient, internal friction angle, adhesive force, Poisson's ratio, static earth pressure coefficient, etc. in each layer.

  Inverse analysis that has been used in computerized construction includes direct formulation, inverse formulation, and brute force method. The direct formulation method uses a direct search method (simplex method, etc.) or a gradient method (conjugate gradient method, etc.) in mathematical calculation methods, and minimizes the sum of the differences between measured values and analytical values at each site. This is a method for obtaining a physical property value parameter, and a deformation coefficient, a Poisson's ratio, an internal friction angle, an adhesive force, and the like are parameters to be subjected to inverse analysis. The inverse formulation method obtains the analytical displacement from the relationship between the stiffness matrix defined by the ratio of the initial stress and the deformation coefficient and the equivalent nodal force of the excavation wall equivalent to the excavation release force. This is a method for obtaining a combination of the ratio between the initial stress and the deformation coefficient so that the sum of the differences from the measured displacement value is minimized, and the ratio between the initial stress and the deformation coefficient is a parameter to be analyzed. The brute force method prepares multiple combinations of physical property value parameters to be obtained, performs an analysis on all the combinations, and reversely analyzes the combination of parameters whose measured values in the field are closest to the analytical values. In this method, the estimated physical property value is used, and any physical property value is a parameter to be analyzed. As a method using the inverse analysis for the ground structure, for example, there are a geological prediction method in front of the ground excavation part disclosed in Patent Document 1, and a search method in front of the tunnel face disclosed in Patent Document 2.

Japanese Patent No. 3976318 JP 2001-166061 A

  Inverse analysis methods that have been used in conventional computerized construction include the direct formulation method, the inverse formulation method, and the brute force method as described above. In the case of the direct formulation method and the inverse formulation method, there are limitations on the types of ground property values that can be obtained by inverse analysis. For this reason, the measured value and the analytical value can be matched for the inner space displacement of the tunnel, but it is difficult to match the ground displacement and the ground surface displacement of the ground around the tunnel. It's not expensive. As a result, the impact of the ground around the tunnel on underground structures and ground surface structures cannot be predicted with high accuracy, and countermeasures that ensure the soundness (maintenance) of those surrounding structures cannot be selected. . In addition, in the round robin method, all ground physical properties can be targeted, but since the reverse analysis is performed for all combinations, the number of calculations becomes enormous, and the reverse analysis cannot be performed within the time constrained by the practice during tunnel construction. . For this reason, the types of ground property values to be back-analyzed are narrowed down. As a result, the accuracy of back-analysis is lowered, and it is not possible to select a countermeasure work that ensures the soundness of surrounding structures.

  Then, this invention makes it a subject to provide the information-ized construction apparatus and information-oriented construction program which can select a rational countermeasure work in construction of a ground structure.

  The computerized construction apparatus according to the present invention is a computerized construction apparatus for a ground structure, and performs reverse analysis based on an experimental design method for a plurality of parameters to be subjected to reverse analysis related to ground structure construction. Inverse analysis to determine each value of multiple parameters so that each measured value measured stress and / or deformation at the site where the ground structure is being constructed matches each analyzed value corresponding to each measured value Measures to select the impact prediction means for predicting the impact due to the construction of the ground structure using each means and each value of the plurality of parameters determined by the inverse analysis means, and the countermeasure work that reduces the impact predicted by the impact prediction means And a work selection means.

  In this computerized construction equipment, multiple parameters to be back-analyzed are set from physical properties related to ground structure construction, and measured values for stress and deformation measured at the site during construction of the ground structure. Is entered. Examples of physical property values related to ground structure construction include unit volume weight, deformation coefficient, Poisson's ratio, internal friction angle, adhesive force, and static earth pressure coefficient. Examples of the stress and deformation to be measured include inner space displacement, ceiling sinking, underground displacement, support stress, rock bolt stress, and ground surface displacement. In computerized construction equipment, by reverse analysis based on the experimental design method, reverse analysis means that each measured value of on-site stress and / or deformation and each corresponding analysis value are matched (matched). Each value of a plurality of parameters is determined. In this way, by adopting the experimental design method, which is one of the statistics, for the reverse analysis, there are no restrictions on the types of physical property values that can be back-analyzed (all physical property values related to ground structure construction are subject to reverse analysis). High-accuracy inverse analysis can be performed while minimizing the combination of parameter values to be subjected to inverse analysis. Furthermore, in the information construction apparatus, the influence prediction means predicts the influence due to the construction of the ground structure using the values of the plurality of parameters determined by the inverse analysis means. Examples of such objects include the ground structure itself, underground structures around the ground structure, and structures on the ground surface around the ground structure, which are affected by stress and deformation in these structures. I can grasp. In the computerized construction apparatus, a countermeasure work that reduces the influence predicted by the influence prediction means is selected by the countermeasure work selection means. As countermeasure work, there are, for example, expansion of the ground improvement range, increase in improvement strength, increase in rigidity of support work, and addition of auxiliary work methods. In this way, this computerized construction equipment adopts an experimental design method for reverse analysis, so that even when many parameters are subject to reverse analysis, highly efficient reverse analysis is possible, so it is necessary for impact prediction. Parameter values can be determined with high efficiency for all physical property values as targets for reverse analysis, and all necessary parameter values can be used to accurately influence the effects of ground structures, surrounding ground structures and ground surface structures. A reasonable countermeasure can be selected based on the highly accurate impact prediction result. The rational countermeasure work is a countermeasure work in which the cost and construction period are suppressed while ensuring the soundness of the structure by the construction of the ground structure (reducing the impact).

  In the information construction apparatus of the present invention, the inverse analysis means sets a combination of each value for a plurality of parameters to be analyzed using an orthogonal table, and uses each value for the plurality of parameters for each combination. Find each analysis value.

  In the inverse analysis means of this computerized construction equipment, a combination of values for a plurality of parameters to be analyzed is set based on the orthogonal table of the experimental design method, and each value of the plurality of parameters is used for each combination. Obtain each analysis value of stress and deformation. Thus, in this information construction apparatus, a combination of a plurality of parameter values to be back-analyzed can be easily set with high accuracy by an experimental design method using an orthogonal method.

  In the information construction apparatus of the present invention, the inverse analysis means sets a combination of values for a plurality of parameters within a search range set for each of the plurality of parameters to be analyzed, and a plurality of parameters for each combination. If each analysis value is calculated using each value for the above, and the error derived from each measurement value and each analysis value of stress and / or deformation at the site where the ground structure is being constructed is more than the allowable error, multiple If the search range for each parameter is narrowed down step by step, and the error derived from each measured value and each analysis value is smaller than the allowable error, each parameter value of the combination at that time is optimized for multiple parameters. Determine as value.

  In this computerized construction apparatus, when a plurality of parameters to be subjected to reverse analysis are set from physical property values related to ground structure construction, search ranges for the respective parameters are also set. And in the inverse analysis means of this information construction apparatus, a combination of values for a plurality of parameters is set based on the orthogonal table within the search range of each parameter to be analyzed, and a plurality of parameters are set for each combination. Each analysis value of stress and deformation is obtained using each value. Further, the inverse analysis means determines, for each combination, whether or not an error derived from each measurement value and each analysis value of the stress and / or deformation in the field is smaller than an allowable error. If the error is greater than or equal to the allowable error (when the measurement value and the analysis value do not match), the inverse analysis means narrows down the search range for multiple parameters step by step, and based on each of the narrowed search ranges Repeat the above process. When the error is smaller than the allowable error (when the measurement value and the analysis value match), the inverse analysis means determines each value of the combination parameter at that time as the optimum value for the plurality of parameters. As described above, in this information construction apparatus, each search range for a plurality of parameters is narrowed down step by step until the error derived from the measurement value and the analysis value becomes smaller than the allowable error, and based on the reduced search range. By determining the optimum value of each parameter, it is possible to easily and accurately determine the optimum value of a plurality of parameters to be reversely analyzed.

  The computerized construction program according to the present invention is a computerized construction program for performing computerized construction for a ground structure, and is applied to a computer and a plurality of parameters to be subjected to reverse analysis related to ground structure construction. Inversely, based on the experimental design method, multiple analyzes are performed so that each measurement value measured for stress and / or deformation at the site where the ground structure is being constructed matches each analysis value corresponding to each measurement value. Predicted by the inverse analysis function that determines each parameter value, the impact prediction function that predicts the effects of ground structure construction using each parameter value determined by the inverse analysis function, and the impact prediction function It is characterized by realizing a countermeasure work selection function for selecting a countermeasure work that reduces the influence.

  In the computerized construction program of the present invention, the inverse analysis function sets a combination of each value for a plurality of parameters to be analyzed using an orthogonal table, and uses each value for a plurality of parameters for each combination. Find each analysis value.

  In the computerized construction program of the present invention, the inverse analysis function sets a combination of values for a plurality of parameters within a search range set for each of a plurality of parameters to be analyzed, and a plurality of parameters for each combination. If each analysis value is calculated using each value for the above, and the error derived from each measurement value and each analysis value of stress and / or deformation at the site where the ground structure is being constructed is more than the allowable error, multiple If the search range for each parameter is narrowed down step by step, and the error derived from each measured value and each analysis value is smaller than the allowable error, each parameter value of the combination at that time is optimized for multiple parameters. Determine as value.

  According to each computerized construction program, by causing the computer to execute each program, the same operations and effects as the computerized construction apparatus are achieved.

  In the present invention, by adopting the design of experiments for inverse analysis, it becomes possible to perform highly efficient inverse analysis even when many parameters are subject to inverse analysis, so all physical property values necessary for impact prediction are inversely analyzed. The parameter value can be determined with high efficiency as a target, and the influence of the ground structure, surrounding ground structure and ground surface structure can be predicted with high accuracy using all necessary parameter values. Rational countermeasures can be selected based on the result of predicting the impact.

It is a block diagram which shows the structure of the information-ized construction apparatus which concerns on this Embodiment. It is an example of the FEM analysis model with respect to a tunnel. It is an example of the optimal parameter search by the reverse analysis using the experiment design method. It is a flowchart which shows the flow of a process in the information-ized construction apparatus of FIG. It is explanatory drawing of the stress and displacement in a tunnel construction site, (a) is a tunnel part, (b) is a tunnel periphery.

  Hereinafter, with reference to the drawings, an embodiment of an information construction apparatus and an information construction program according to the present invention will be described. In addition, the same code | symbol is attached | subjected about the element which is the same or it corresponds in each figure, and the overlapping description is abbreviate | omitted.

  In the present embodiment, the present invention is applied to an information construction apparatus for a tunnel. The computerized construction apparatus according to the present embodiment uses FEM analysis (finite element) as a parameter of physical property values related to tunnel construction based on measured values of stress and deformation at the construction site at each construction stage during tunnel construction. Perform a reverse analysis by legal analysis), predict the impact of tunnel construction by FEM analysis using the optimum values of parameters determined by this reverse analysis, and adopt a reasonable countermeasure work to reduce the impact (adopted at the next construction stage) Selected countermeasures). In addition, since the conventional method is applied about FEM analysis, detailed description is abbreviate | omitted below.

  Physical property values related to tunnel construction include ground property values and support member property values. Examples of the physical property values include unit volume weight, deformation coefficient, Poisson's ratio, internal friction angle, adhesive force, and static earth pressure coefficient. Examples of the supporting member physical property values include unit volume weight, deformation coefficient, internal friction angle, adhesive force, cross-sectional area, and cross-sectional secondary moment. Examples of the stress and deformation at the tunnel construction site include steel support stress, shotcrete stress, rock bolt stress, tunnel inner-space displacement, ceiling sinking, underground displacement, ground surface displacement, and the like. As countermeasure work, there are, for example, expansion of the ground improvement range, increase in improvement strength, increase in rigidity of support work, and addition of auxiliary work methods (AGF, rock bolts, etc.).

  With reference to FIGS. 1-3, the information construction apparatus 1 which concerns on this Embodiment is demonstrated. FIG. 1 is a block diagram showing a configuration of an information construction apparatus according to the present embodiment. FIG. 2 is an example of an FEM analysis model for a tunnel. FIG. 3 is an example of optimum parameter search by inverse analysis using an experimental design method.

  In order to select a reasonable countermeasure work, the computerized construction equipment 1 reduces the impact on the tunnel and its surrounding underground structures and ground surface structures while reducing the cost and construction period in the tunnel construction. Inverse analysis is performed using all the physical property values necessary for predicting the effects on the tunnel and surrounding structures as parameters. For this purpose, the computerized construction apparatus 1 employs an experimental design method for inverse analysis, and eliminates restrictions on the types of physical property values that can be inversely analyzed by the experimental design method using the orthogonal method (all physical property values related to tunnel construction). Can be used as a parameter for inverse analysis), and a highly accurate inverse analysis is performed while minimizing the combination of the values of the parameters to be subjected to inverse analysis.

  The experimental design adopted for inverse analysis is to create a combination table (orthogonal table) for each value of a plurality of parameters set in advance, and use the parameter values of each combination based on the orthogonal table to measure By calculating each analysis value for the stress and deformation of the sample and repeating the process to narrow down the parameter range that minimizes the sum of the differences between the actual measurement values and each analysis value, This is a method for searching for the optimum value of. This method allows inverse analysis with as few combinations as possible, so the number of calculations can be greatly reduced compared to the brute force method, and the optimal parameter values can be estimated with the same degree of accuracy as the brute force method. it can. The orthogonal table is a parameter combination table that can produce almost the same effect as when all combinations are tried with a predetermined combination of specific parameters.

  As shown in FIG. 1, the computerized construction apparatus 1 includes a countermeasure work database 2, an optimum parameter data 3, an input part 4, an FEM analysis part 5, an optimum parameter search part 6, an FEM analysis part 7, and a countermeasure work validity judgment part. 8 and an output unit 9 are provided. The information construction apparatus 1 may be a dedicated apparatus that performs only information construction, or may be configured by executing an application program for information construction on a general-purpose computer such as a personal computer.

  In the present embodiment, the FEM analysis unit 5 and the optimum parameter search unit 6 correspond to the inverse analysis unit described in the claims, and the FEM analysis unit 7 corresponds to the influence prediction unit described in the claims. The countermeasure work validity determination unit 8 corresponds to the countermeasure work selection means described in the claims.

  The countermeasure work database 2 is a database configured in a predetermined area of the storage device (hard disk or the like) of the computerized construction apparatus 1. The countermeasure work database 2 stores countermeasure works for tunnel construction. The specific countermeasures stored are the countermeasures described above.

  The optimum parameter data 3 is a data temporary storage area configured in a predetermined area of the RAM of the information processing apparatus 1. The optimum parameter data 3 temporarily stores the optimum value of each parameter to be analyzed by the optimum parameter search unit 6. The temporarily stored parameter is a parameter set as a parameter for reverse analysis from the above-described ground physical property values and support member physical property values.

  The input unit 4 is configured by a keyboard, a mouse, or the like of the information processing apparatus 1 and is a means for an operator to input. The input from the input unit 4 includes a plurality of measured values measured at the tunnel construction site, a plurality of parameters to be subjected to reverse analysis, a search range (initial value) of each parameter, and a ground around the tunnel to be constructed. Data, terrain data, surrounding underground structure data, ground surface structure data, and the like. The input measurement values are values measured at the tunnel construction site for stresses and deformations to be matched with the analysis values obtained by the FEM analysis among the stresses and deformations in the tunnel and the vicinity of the tunnels described above. The parameters for the reverse analysis input are the physical property values necessary for predicting the effects of tunnel construction on the tunnel and its surrounding structures, among the physical property values and support member physical property values shown above. is there. The search range (initial value) of the parameters to be analyzed is the range from the upper limit value to the lower limit value that can be considered for the ground where the tunnel is constructed for each physical property value of the ground, and the upper limit value that is considered for each physical property value of the support construction. The range is up to the lower limit. These search ranges may be input together with the parameters to be reversely analyzed every time information processing is performed, or search ranges for all physical property values may be input in advance only once.

  The FEM analysis unit 5 first creates a tunnel under construction and an analysis model around the tunnel by FEM analysis (finite element method analysis). FIG. 2 shows an example of an analysis model. The hollow portions T and T are tunnel portions that are being excavated, and a structure B is installed on the ground surface.

  The FEM analysis unit 5 sequentially sets combinations of values of a plurality of parameters to be inversely analyzed using an orthogonal table for each search range at each stage. The orthogonal table is created by the same method as the orthogonal table used in the conventional experimental design, and is created based on the search range of each parameter for each search range at each stage. For each set combination, the FEM analysis unit 5 performs analysis values (analysis of stress and deformation input as measurement values by FEM analysis using the created analysis model based on each value of the parameter of the combination. Calculate the predicted value).

In the optimum parameter search unit 6, every time an analysis value for the combination that is the FEM analysis unit 5 is calculated (for each combination in a search range at a certain stage), all the measured values for stress and deformation that are input and corresponding to it The total sum of the differences between the measured values and the analysis values is calculated as an error according to equation (1) using all the analysis values to be calculated. Although the sum of the squares of the differences is used as an error in equation (1), the sum of the differences may be used as an error as it is. Then, the optimum parameter search unit 6 determines whether or not the error is smaller than the allowable error. The allowable error is an allowable amount of error that can be considered that the measured value and the analysis value match (match), and is set in advance.
Error = Σ (calculated value−analyzed value) ² (1)

  When it is determined that the error is greater than or equal to the allowable error for all combinations in the search range at a certain stage, the optimum parameter search unit 6 evaluates the error factor by a significant difference test. Since the conventional method is applied to the significant difference test, a detailed description is omitted. Then, the optimum parameter search unit 6 narrows down each search range step by step for a plurality of currently set parameters based on the evaluation result, and resets each search range smaller than the previous time. In addition, as a method for narrowing down the search range, a method other than the method using the significant difference test may be used.

  When it is determined that the error is smaller than the allowable error for a certain combination in the search range at a certain narrowing step, the optimum parameter search unit 6 determines each value of the parameter of the combination as the optimum value of each parameter to be reversely analyzed, The optimum value of each parameter is temporarily stored in the optimum parameter data 3. When there are a plurality of combinations in which the error is smaller than the allowable error in the search range at a certain narrowing stage, for example, the combination with the smallest error is selected.

  FIG. 3 shows an example of optimum parameter search by inverse analysis using an experimental design method. In this example, in order to make it easy to understand, there are two cases where the parameters to be reversely analyzed are a lateral pressure coefficient and a deformation coefficient. In this example, the relationship between the side pressure coefficient, the deformation coefficient, and the error consisting of the sum of the differences between each measured value and each analyzed value is shown in a three-dimensional graph, where the x axis is the side pressure coefficient and the y axis is the deformation coefficient. And the z-axis is an error. A range A1 indicated by an outermost solid line is a first-stage search range including a search range for initial side pressure coefficients and a search range for deformation coefficients. A range A2 indicated by a solid line on the inner side is a second-stage search range including a search range for the lateral pressure coefficient narrowed down from the range A1 and a search range for the deformation coefficient. A range A3 indicated by a solid line on the inside is a third-stage search range including a search range for the lateral pressure coefficient narrowed down from the range A2 and a search range for the deformation coefficient. A range A4 indicated by a solid line on the inside is a fourth-stage search range including a search range for the lateral pressure coefficient narrowed down from the range A3 and a search range for the deformation coefficient.

  In the search ranges A1, A2, A3, and A4 at each stage, combinations of the parameter values of the lateral pressure coefficient and the deformation coefficient set in the orthogonal table are indicated by triangles. In the case of this example, in the search ranges A1, A2, A3, and A4 at each stage, the analysis values are calculated using the parameter values of the lateral pressure coefficient and the deformation coefficient for the nine combinations. As the search range is narrowed down, the parameter value interval of each combination is also reduced, and the parameter values that reduce the error are narrowed down. Finally, when the parameter value of the side pressure coefficient and the parameter value of the deformation coefficient of the combination C within the search range A4 of the fourth stage are set, the error becomes smaller than the allowable error. This is the optimum value of the coefficient and deformation coefficient. Therefore, in the case of this example, 9 × 4 = 36 analysis value calculations are performed by FEM analysis. In the case of the brute force method, for example, each intersection indicated by a broken line set in the search range for the initial lateral pressure coefficient and the deformation coefficient search range is a brute force combination, and 11 × 11 = 121 FEMs. Analysis value calculation by analysis is performed.

  In the FEM analysis unit 7, when the optimum parameter search unit 6 determines the optimum value of each parameter to be back-analyzed, the predicted value of the influence on the tunnel and surrounding structures is calculated by FEM analysis using the optimum value of each parameter. To do. Here, the predicted value is the structure of the tunnel (the structure for which maintenance is to be ensured) for which the effect of tunnel construction is to be reduced in the stress and deformation of the tunnel, the underground structure around the tunnel and the ground surface structure. Each predicted value for stress and deformation is calculated.

  In addition, every time the countermeasure construction validity judgment section 8 resets the countermeasure construction, the FEM analysis section 7 assumes that the tunnel construction was performed using the countermeasure construction, and uses the optimum values of the respective parameters. The predicted value of the impact on the tunnel and surrounding structures is calculated by analysis.

  The countermeasure work validity determination unit 8 determines whether each predicted value is smaller than the evaluation reference value every time the FEM analysis unit 7 calculates the predicted value. The evaluation standard value is a threshold value for determining whether soundness (maintenance) is ensured by the effect of tunnel construction on the structure, and is previously determined for each predicted value (stress and deformation of each structure). Is set.

  When any one or more predicted values are determined to be equal to or greater than the evaluation reference value, the countermeasure work validity determination unit 8 selects a countermeasure work from the countermeasure works stored in the countermeasure work database 2 and executes the countermeasure work. Reset it. Here, for example, in consideration of the predicted stress and deformation value of the structure that is equal to or higher than the evaluation reference value, a countermeasure work that can reduce the stress and deformation is selected. On the other hand, when it is determined that all the predicted values are smaller than the evaluation reference value, the countermeasure work validity determination unit 8 outputs the currently set countermeasure work from the output unit 9 as a countermeasure work at the next construction stage.

  The output unit 9 includes a display of the information processing apparatus 1 and a connected printer, and is a means for outputting various information and results from the information processing apparatus 1. As the output, at least the countermeasure work finally determined by the countermeasure work validity determination unit 8 is output, and other information such as the optimum value of each parameter searched by the optimum parameter search unit 6 is also output. Also good.

  With reference to FIGS. 1-3, the flow of the process in the information construction apparatus 1 is demonstrated along the flowchart of FIG. FIG. 4 is a flowchart showing the flow of processing in the computerized construction apparatus of FIG. FIG. 5 is an explanatory diagram of stress and displacement at a tunnel construction site, where (a) is a tunnel portion and (b) is a tunnel periphery.

  When each construction stage is completed during the tunnel construction, as shown in FIG. 5, the tunnel displacement ID, ceiling subsidence CS, underground displacement UD, ground surface displacement GD, support stress SS, etc. Each displacement and each stress is measured. The operator of the computerized construction apparatus 1 inputs these measurement values (measurement values to be matched with the analysis values) through the input unit 4. Further, the operator of the computerized construction apparatus 1 selects the parameters for the reverse analysis necessary for the impact prediction from the ground physical property values and the support member physical property values, and inputs the reverse analysis target parameters and the search range thereof by the input unit 4. Is entered. In addition, in FIG. 5, the boundary line shown with the continuous line of code | symbol CB shows before construction, and the boundary line shown with the broken line of code | symbol CA shows after construction. In FIG. 5B, what is indicated by a symbol DM is an underground displacement meter, and the underground displacement UD is measured by the underground displacement meter DM.

  The computerized construction apparatus 1 creates an analysis model for the reverse analysis target tunnel and the surrounding ground by FEM analysis (S1). Each measured value at the site of tunnel construction is set in the computerized construction apparatus 1 (S2). In addition, a plurality of parameters to be subjected to reverse analysis necessary for impact prediction are set in the information processing apparatus 1, and a search range for each parameter is set (S2).

  When a search range at a certain stage is set, the information processing apparatus 1 sets a combination of parameter values based on the orthogonal table within the search range (S3). For each combination, the computerized construction apparatus 1 calculates each analysis value for stress and deformation corresponding to each set measurement value by FEM analysis using each value of the parameter of the combination ( S4). Then, the computerized construction apparatus 1 calculates an error according to the equation (1) using each measured value and each analysis value corresponding to the measured value, and determines whether or not the error is smaller than an allowable error (S5). Here, all combinations set by the orthogonal table are determined.

  When it is determined in S5 that the error is greater than or equal to the allowable error for all combinations in the search range at a certain stage (in the search range at that stage, the optimum parameter such that the measured value in the field matches the analysis value estimated by the FEM analysis) In the information construction apparatus 1, the error factor evaluation by the significant difference test is performed (S 6), and the search range smaller than the previous time is reset for each parameter to be analyzed backward (S 7). And in the information construction apparatus 1, the process of S3-S5 is performed again within the search range set about each reset parameter.

  When it is determined in S5 that the error is smaller than the permissible error for a certain combination in the search range at a certain stage (when an optimum parameter that matches the measured value in the field and the analytical value estimated by FEM analysis can be determined) In the information construction apparatus 1, each value of the combination parameter at that time is determined as an optimum value of each parameter (S8).

  And in the information-oriented construction apparatus 1, the predicted value of the influence (stress and deformation of the part which wants to reduce an influence) about a tunnel and a surrounding structure is calculated by FEM analysis using the optimal value of each parameter (S9). . Furthermore, in the information construction apparatus 1, it is determined whether the predicted value is smaller than the evaluation reference value (S10). When it determines with all the predicted values being smaller than an evaluation reference value in S10, the information construction apparatus 1 complete | finishes a process, without selecting countermeasure work. Then, in the next tunnel construction stage, tunnel construction is performed using the same construction method as the previous construction stage.

  When it is determined in S10 that one or more predicted values are equal to or higher than the evaluation reference value, the information construction apparatus 1 sequentially sets countermeasure works from the respective countermeasure works prepared in the countermeasure work database 2, and sets the countermeasure works. The effect verification analysis in the case of having performed is performed, and the predicted value of the influence about a tunnel and a surrounding structure is calculated (S11). And in the information construction apparatus 1, it is determined whether a predicted value is smaller than an evaluation reference value (S12). When it is determined in S12 that one or more predicted values are equal to or greater than the evaluation reference value, the information processing apparatus 1 returns to the process in S11, selects a different countermeasure work, and performs determination again in S12. On the other hand, when it determines with all the predicted values being smaller than evaluation reference value in S12, the information construction apparatus 1 outputs the selected latest countermeasure work, and complete | finishes a process. In the next tunnel construction stage, tunnel construction is performed using the finally selected countermeasures.

  According to this computerized construction apparatus 1, by adopting an experimental design for reverse analysis, even if many parameters are subject to reverse analysis, highly efficient reverse analysis is possible, so all necessary for impact prediction Inverse analysis can be performed using the physical property values of the parameters as parameters to be subjected to inverse analysis, and the optimum values of all the parameters necessary for effect prediction can be determined with high efficiency. As a result, it is possible to accurately and accurately predict the effects of tunnel structures and the surrounding ground on underground structures and ground surface structures using the optimum values of all parameters required for impact prediction. Reasonable countermeasures can be selected based on the prediction results. The rational countermeasure work is a countermeasure work that reduces the cost and construction period while ensuring the soundness of the surrounding structures by construction of the ground structure (reducing the impact). In addition, since highly efficient reverse analysis is possible, the processing load required for reverse analysis can be reduced, and reverse analysis can be performed within a limited time during the actual construction of the tunnel.

  Moreover, according to the information construction apparatus 1, since a rational countermeasure work can be selected as described above, it is possible to achieve both improvement in tunnel construction productivity and soundness of surrounding structures. Specifically, it is possible to prevent rework such as repetition (re-excavation) due to the occurrence of excessive displacement, minimize construction costs, and sound the structure around the tunnel.

  As mentioned above, although embodiment which concerns on this invention was described, this invention is implemented in various forms, without being limited to the said embodiment.

  For example, in the present embodiment, the present invention is applied to an information construction apparatus for tunnels, but it may be applied to other ground structures, and can be applied to, for example, building excavation work and embankment construction work.

  In this embodiment, the present invention is applied to an information processing apparatus. However, the present invention is applied to a program stored in a storage medium such as a CD-ROM or a program that can be used via a network such as the Internet. It is good also as a structure which performs the information construction about a ground structure by performing on a computer.

  In this embodiment, FEM analysis is applied by inverse analysis or influence prediction, but other methods may be applied.

  DESCRIPTION OF SYMBOLS 1 ... Computerized construction apparatus, 2 ... Countermeasure work database, 3 ... Optimum parameter data, 4 ... Input part, 5 ... FEM analysis part, 6 ... Optimum parameter search part, 7 ... FEM analysis part, 8 ... Countermeasure work validity judgment Part, 9... Output part.

Claims (6)

It is an information construction equipment for ground structures,
Inverse analysis based on the experimental design method for a plurality of parameters subject to reverse analysis related to ground structure construction, and each measurement value measured for stress and / or deformation at the site where the ground structure is being constructed Back analysis means for determining each value of the plurality of parameters so that each analysis value corresponding to each measurement value matches,
An impact prediction means for predicting the influence of the ground structure construction using each value of the plurality of parameters determined by the inverse analysis means;
Countermeasure work selection means for selecting a countermeasure work that reduces the impact predicted by the impact prediction means;
A computerized construction device characterized by comprising:   The inverse analysis means sets each value combination for a plurality of parameters to be inversely analyzed using an orthogonal table, and obtains each analysis value using each value for the plurality of parameters for each combination. The computerized construction apparatus according to claim 1.   The inverse analysis means sets a combination of values for a plurality of parameters within a search range set for each of a plurality of parameters to be inversely analyzed, and performs each analysis using each value for the plurality of parameters for each combination. If the error derived from each measured value and analysis value of stress and / or deformation at the site where the ground structure is being constructed exceeds the allowable error, the search range for multiple parameters is staged. When the error derived from each measurement value and each analysis value becomes smaller than the allowable error, each parameter value of the combination at that time is determined as an optimum value of a plurality of parameters. The computerized construction apparatus according to claim 2. A computerized construction program for conducting computerized construction for ground structures,
On the computer,
Inverse analysis based on the experimental design method for a plurality of parameters subject to reverse analysis related to ground structure construction, and each measurement value measured for stress and / or deformation at the site where the ground structure is being constructed A reverse analysis function for determining each value of the plurality of parameters so that each analysis value corresponding to each measurement value is consistent;
An impact prediction function for predicting the impact of the ground structure construction using each value of the plurality of parameters determined by the inverse analysis function;
Countermeasure work selection function for selecting a countermeasure work that reduces the impact predicted by the impact prediction function;
Computerized construction program characterized by realizing   The inverse analysis function is characterized by setting each value combination for a plurality of parameters to be inversely analyzed using an orthogonal table and obtaining each analysis value using each value for the plurality of parameters for each combination. The computerized construction program according to claim 4.   The inverse analysis function sets a combination of values for a plurality of parameters within a search range set for each of a plurality of parameters to be inversely analyzed, and performs each analysis using each value for the plurality of parameters for each combination. If the error derived from each measured value and analysis value of stress and / or deformation at the site where the ground structure is being constructed exceeds the allowable error, the search range for multiple parameters is staged. When the error derived from each measurement value and each analysis value becomes smaller than the allowable error, each parameter value of the combination at that time is determined as an optimum value of a plurality of parameters. The computerized construction program according to claim 5.

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