Evaluation device and evaluation method of evaluation target area after ground improvement, and program

Abstract

To provide a technology that can be applied to quality evaluation of an actual construction work and evaluates an evaluation target area after ground improvement.SOLUTION: An acquisition section 11 acquires a relation between a true relevance ratio which is calculated as a percentage of areas where an evaluation index value of a ground improvement result in an evaluation target area satisfies an evaluation standard value, and a pass rate which is a percentage of areas where a performance index value after ground improvement in the evaluation target area satisfies a performance standard value. A calculation section 12 uses the acquired relation between the true relevance ratio and the pass rate to calculate a relation between an actual relevance ratio which is obtained as a percentage of areas in the evaluation target area where an evaluation index value satisfies the evaluation standard value, and the pass rate, for each number of evaluation index surveys in the evaluation target area. In the calculated relation of the actual relevance ratio and the pass rate, an evaluation section 13 evaluates a relevance ratio for performance index in the evaluation target area by applying a calculated value, in which the number of surveys of the evaluation index in the evaluation target area is used as a denominator and the number of surveys in which the evaluation index value satisfies the evaluation standard value as the numerator, to the actual relevance ratio.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a technique for evaluating an area to be evaluated after ground improvement. [Background technology]

[0002] It is known that ground improved by various solidification treatment methods has a large spatial variation in soil constants such as shear modulus and liquefaction strength compared to natural deposits due to reasons such as uneven mixing or infiltration of solidification materials and chemical solutions, or heterogeneity of the soil quality of the target ground. Conventional quality evaluation methods based on specifications cannot correctly evaluate the spatial variation in ground after ground improvement, and safety is guaranteed, for example, by multiplying a large safety factor. However, such excessive safety factors and underestimation of performance increase the amount of solidification material required, which increases the economic burden and may even increase carbon dioxide emissions.

[0003] Here, many studies have been conducted taking into account the spatial variation of ground constants (for example, Non-Patent Documents 1 to 3). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Kiyonobu Kasama, Keisuke Nishida, Zentaro Furukawa, Teppei Akimoto, Ayato Tsutsumi, Yohei Katayama: Earthquake deformation analysis of permeable solidification treated ground considering heterogeneity of ground constants, Journal of Japan Society of Civil Engineers, Proceedings of the Society of Civil Engineers, Vol. 78, No. 2, pp. I_901-I_906, 2022.

[0005] [Non-Patent Document 2] Takashi Tsuchida and Kenji Ono: Prediction of differential settlement by numerical simulation and its application to airport pavement design, Report of the Port and Harbor Research Institute, Vol. 27, No. 4, pp. 123-200, December 1988.

[0006] [Non-Patent Document 3] Ryoichiro Satake and Akihiko Wakai: Analytical study on the effect of material heterogeneity on slope stability, Geotechnical Journal, Vol.14, No.2, pp.95-109, 2019. Summary of the Invention [Problem to be solved by the invention]

[0007] All of these studies only analyzed virtual ground in which various ground constants were set to vary, and were not able to evaluate the quality of the actual construction. Therefore, the application of these analysis results is limited to the design field.

[0008] Therefore, an object of the present invention is to provide a technology that can be applied to quality evaluation of ground improvement results during actual construction work and that can evaluate the evaluation target area after ground improvement. [Means for solving the problem]

[0009] The evaluation device for an evaluation target area after ground improvement according to the present invention includes an acquisition unit that acquires a relationship between a true suitability ratio calculated by a predetermined algorithm as a ratio of an area in which an evaluation index value, which is a numerical value of an evaluation index that is an item for evaluating a result of ground improvement in the evaluation target area after ground improvement, satisfies a predetermined evaluation standard value, and a pass rate, which is a ratio of an evaluation target area in which a performance index value, which is a numerical value of a performance index that is an index item related to the performance after ground improvement in the evaluation target area, satisfies a predetermined performance standard value, and a calculation unit that calculates a relationship between the actual conformance rate, which is determined as the percentage of the area in which the evaluation index value satisfies the evaluation standard value, and the pass rate, for each number of surveys of the evaluation index in the evaluation target area; and an evaluation unit that evaluates the conformance rate for the performance index in the evaluation target area by applying to the measured conformance rate a calculated value in the relationship between the actual conformance rate and the pass rate calculated by the calculation unit for the number of surveys of the evaluation index in the evaluation target area, the calculated value being the denominator, and the number of surveys in which the evaluation index value satisfies the evaluation standard value,

[0010] The evaluation index may be at least one of the following: unconfined compressive strength, N value, vane shear strength, fine particle content, silica content, and density.

[0011] The calculation unit may calculate the relationship between each of the measured conformance rates and the pass rate based on the occurrence frequency of the measured conformance rate in each of the true conformance rates and the relationship between the true conformance rate and the pass rate acquired by the acquisition unit.

[0012] The evaluation unit may calculate the calculated value from the evaluation index value obtained by investigating a sample obtained from the evaluation target area after ground improvement.

[0013] The performance index may be at least one of a supporting force, a displacement amount, and a rotation angle.

[0014] The method for evaluating an evaluation target area after ground improvement according to the present invention includes the steps of: acquiring a relationship between a true suitability ratio calculated by a predetermined algorithm as the proportion of an area in which an evaluation index value, which is a numerical value of an evaluation index that is an item for evaluating the result of ground improvement in the evaluation target area after ground improvement, satisfies a predetermined evaluation standard value; and a pass rate, which is the proportion of the evaluation target area in which a performance index value, which is a numerical value of a performance index that is an index item related to the performance of the evaluation target area after ground improvement, satisfies a predetermined performance standard value; and performing the relationship between the true suitability ratio and the pass rate obtained by the acquisition step to evaluate the true suitability ratio in the evaluation target area. The method may further include a calculation step of calculating the relationship between the measured conformance rate, which is determined as the percentage of the area in which the evaluation index value satisfies the evaluation standard value, and the pass rate for each number of surveys of the evaluation index in the area to be evaluated, and an evaluation step of evaluating the conformance rate for the performance index in the area to be evaluated by applying to the measured conformance rate a calculated value in which the number of surveys of the evaluation index in the area to be evaluated is used as the denominator and the number of surveys in which the evaluation index value satisfies the evaluation standard value is used as the numerator in the relationship between the measured conformance rate and the pass rate calculated by the calculation step for the number of surveys of the evaluation index in the area to be evaluated.

[0015] The program according to the present invention includes an acquisition unit that acquires a relationship between a true suitability ratio calculated by a predetermined algorithm as the ratio of an area in an evaluation target area after ground improvement where an evaluation index value, which is a numerical value of an evaluation index that is an item for evaluating the result of ground improvement in the evaluation target area, satisfies a predetermined evaluation standard value, and a pass rate that is the ratio of an evaluation index value, which is a numerical value of a performance index that is an index item related to the performance of the evaluation target area after ground improvement, in the evaluation target area, that satisfies a predetermined performance standard value; and a calculation unit that calculates the relationship between the measured conformance rate, which is obtained as the percentage of the area that satisfies the evaluation standard value, and the pass rate, for each number of surveys of the evaluation index in the evaluation target area; and an evaluation unit that evaluates the conformance rate for the performance index value in the evaluation target area by applying to the measured conformance rate a calculated value in which the number of surveys of the evaluation index in the evaluation target area is used as the denominator and the number of surveys in which the evaluation index value satisfies the evaluation standard value, in the relationship between the measured conformance rate and the pass rate calculated by the calculation unit for the number of surveys of the evaluation index in the evaluation target area. Effect of the Invention

[0016] According to the present invention, it is possible to provide a technology that can be applied to the quality evaluation of the implemented construction and can evaluate the evaluation target area after ground improvement work. [Brief description of the drawings]

[0017]

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[0018] (composition) Fig. 1 is a diagram showing the overall configuration of a system according to an embodiment of the present invention. This system includes an evaluation device 10 that evaluates the ground corresponding to an area to be evaluated after ground improvement, and an investigation system 20 that includes various devices for conducting a post-inspection investigation of the area to be evaluated after the ground improvement.

[0019] 2 is a diagram showing a hardware configuration of the evaluation device 10. The evaluation device 10 is physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus connecting these devices. Each of these devices operates using power supplied from a power source (not shown).

[0020] Each function in the evaluation device 10 is realized by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, acquires data transmitted from other devices, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0021] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.

[0022] The processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, those that cause a computer to execute at least a part of the operations described below are used.

[0023] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a Random Access Memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), software modules, etc. that are executable to implement the method according to the present embodiment.

[0024] The storage 1003 is a computer-readable recording medium, such as a hard disk drive or a flash memory.

[0025] The communication device 1004 is hardware (transmitting / receiving device) for performing communication between computers.

[0026] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.

[0027] Here, the meaning of each term used in this embodiment will be explained. The evaluation index is an item for evaluating the result of ground improvement in the evaluation target area after the ground improvement, and is, for example, at least one of the following items: unconfined compressive strength, N value, vane shear strength, fine particle content, silica content, and density. The investigation system 20 investigates a sample obtained from the evaluation target area after the ground improvement to obtain an evaluation index value, which is the numerical value of any one of these evaluation indexes. These evaluation index values ​​are input to the evaluation device 10.

[0028] A performance index is an index item related to the performance of the evaluation area after ground improvement in the evaluation area after ground improvement, and includes, for example, at least one of the following items: bearing capacity, displacement amount, or rotation angle.

[0029] The compatibility rate is a concept that indicates the spatial ratio in the evaluation area after ground improvement that satisfies the specified evaluation standard value for the evaluation index value. There are two concepts of this compatibility rate: the true compatibility rate and the actual measurement compatibility rate.

[0030] The true suitability rate is the spatial ratio in the evaluation area after ground improvement where the evaluation index value satisfies a predetermined evaluation standard value, that is, the true value of the above-mentioned suitability rate. This true suitability rate can be obtained by a predetermined algorithm proposed in "Kiyonobu Kasama, Keisuke Nishida, Zentaro Furukawa, Teppei Akimoto, Ayato Tsutsumi, Yohei Katayama: Earthquake deformation analysis of permeable solidification treated ground considering heterogeneity of ground constants, Journal of the Japan Society of Civil Engineers, Vol. 78, No. 2, pp. I_901-I_906, 2022." The true suitability rate is the true value of the suitability rate, and can be calculated by the above algorithm, but in the actual construction, it is a value that can only be estimated from a limited number of surveys of post-mortem surveys.

[0031] The measured conformity rate is the spatial ratio in the evaluation area after ground improvement where the evaluation index value obtained from the post-inspection survey results satisfies the specified evaluation standard value. Specifically, it is calculated by the formula: (number of surveys in which the post-inspection results satisfied the specified evaluation standard value) / (total number of surveys in the post-inspection surveys). This measured conformity rate is less reliable than the true conformity rate mentioned above.

[0032] The pass rate is the percentage of evaluation target areas in which the performance index value, which is the numerical value of the performance index of the evaluation target area, satisfies a predetermined performance standard value.

[0033] 3 is a diagram showing the functional configuration of the evaluation device 10. The evaluation device 10 realizes the functions of an acquisition unit 11, a calculation unit 12, and an evaluation unit 13. In the following description, the evaluation index is set to "uniaxial compressive strength" and the performance index is set to "residual horizontal displacement after an earthquake." However, as described above, the items of the evaluation index and the performance index are not limited to these.

[0034] In FIG. 3, the acquisition unit 11 acquires the relationship between the true conformance rate and the pass rate. The relationship between the true conformance rate and the pass rate is disclosed in the aforementioned "Kiyonobu Kasama, Keisuke Nishida, Zentaro Furukawa, Teppei Akimoto, Ayato Tsutsumi, Yohei Katayama: Earthquake deformation analysis of permeable solidification treated ground considering heterogeneity of ground constants, Proceedings of the Japan Society of Civil Engineers B3 (Marine Development), Vol. 78, No. 2, pp. I_901-I_906, 2022.", but will be briefly described below.

[0035] First, various analysis conditions for an actual structure that is to be evaluated are input using the well-known FEM (Finite Element Method).

[0036] Next, the average value, coefficient of variation, and autocorrelation distance of the unconfined compressive strength assumed in the actual construction are set, and multiple cross sections with spatial variation are generated by Monte Carlo simulation (MCS). The average value, coefficient of variation, and autocorrelation distance of the unconfined compressive strength may each be set with a range, and multiple combinations of these may be used. Here, the coefficient of variation is the standard deviation divided by the average value, and indicates the degree of variation in the data. The autocorrelation distance is a distance that indicates the extent to which the ground can be considered to be probabilistically the same. The autocorrelation distance indicates the range in which, when the value of a certain ground parameter is larger (smaller) than the average value, the parameter values ​​adjacent to the range of the scale of variation are expected to be larger (smaller) than the average value as well.

[0037] Next, an analysis is performed for each generated cross section, the average value of the residual horizontal displacement is calculated for each trial of the analysis, and the number of cross sections required for convergence is determined. Fig. 4 is a graph showing the relationship between the number of trials and the average value of the residual horizontal displacement. In the example of Fig. 4, the average value of the residual horizontal displacement generally converges after about 80 trials for each matching rate (true matching rate). Therefore, in this embodiment, a margin is taken and 100 cross sections are created.

[0038] Next, we obtain the relationship between the true suitability rate and the pass rate. As mentioned above, the pass rate is the rate at which the performance index value satisfies the specified performance standard value, but here we refer to it as the pass rate as the probability that the residual horizontal displacement after an earthquake will be 1.5 m or less.

[0039] Figure 5 is a graph showing the relationship between the true conformance rate (horizontal axis) and the percentage of 100 cross sections where the residual horizontal displacement was 1.5 m or less, in other words, the pass rate (vertical axis). In this graph, there are two average unconfined compressive strengths, 100 kPa and 132 kPa, and there are five true conformance rates, so there are 10 plots corresponding to the number of combinations. By arbitrarily setting a target pass rate (a pass rate of 0.95 in this case), it is possible to determine the true conformance rate required to achieve that pass rate.

[0040] Returning to the explanation of Fig. 3, the calculation unit 12 uses the relationship between the true matching rate and the pass rate acquired by the acquisition unit 11 to calculate the relationship between the actual matching rate and the pass rate, which is determined by taking into account the statistical estimation error as the ratio of the area in the evaluation target area where the evaluation index value satisfies the evaluation reference value, for each number of surveys of the evaluation index in the evaluation target area. Specifically, the calculation is as follows.

[0041] First, whether or not the performance index value obtained by the post-mortem survey satisfies the performance standard value is expressed by the binomial distribution in statistics. Figure 6 is a graph showing the relationship between the actual precision (horizontal axis) and the occurrence probability of the actual precision (vertical axis) for each number of surveys when the true precision is 50%. From Figure 6, it can be seen that the occurrence probability of the actual precision varies depending on the number of surveys in the post-mortem survey. In other words, even if the true precision is a certain value in theory, the actually measured precision varies each time. In the example of Figure 6, when the true precision is 50%, for example, if the number of surveys is 1, the occurrence probability of the actual precision of 100% is 50%, and the occurrence probability of the actual precision of 0% is 50%. Note that in Figure 6, the actual precision is expressed as 0 to 1, not as a percentage, so that the actual precision of 100% is the actual precision of "1" (the same applies below). In addition, when the true relevance rate is 50%, for example, if the number of surveys is 2, the probability of an actual relevance rate of 100% is 25%, the probability of an actual relevance rate of 50% is 50%, and the probability of an actual relevance rate of 0% is 25%.

[0042] 7 is a graph showing the relationship between the actual relevance rate (horizontal axis) and the occurrence probability of the actual relevance rate (vertical axis) for each number of surveys when the true relevance rate is 80%. In FIG. 7, when the true relevance rate is 80% and the number of surveys is 1, the occurrence probability of the actual relevance rate of 100% is 80%, and the occurrence probability of the actual relevance rate of 0% is 20%.

[0043] Using the graphs shown in Figs. 6 and 7, the occurrence probability of the measured precision is calculated when the true precision is set to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90%, and the number of surveys is set to 1, 2, 3, 4, 5, 10, 20, 30, and 50. As shown in Fig. 8, for example, when the number of surveys (number of samples) is 10 and the true precision is 50% (0.45-0.55), the occurrence probability of the measured precision of 100% is 0.001, the occurrence probability of the measured precision of 80% is 0.044, the occurrence probability of the measured precision of 50% is 0.246, the occurrence probability of the measured precision of 20% is 0.044, and the occurrence probability of the measured precision of 0% is 0.001.

[0044] In this way, when the number of surveys is 10, the occurrence frequency of each measured precision is calculated for each of the true precisions of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90%. As shown in the example in Figure 9, for example, the frequency of a measured precision of 50% out of 10 surveys (number of samples) is 0.015 when the true precision is 90%, 0.264 when the true precision is 80%, 1.029 when the true precision is 70%, 2.007 when the true precision is 60%, and 2.461 when the true precision is 50%. Note that the total value of the frequencies of the measured precisions of 50% corresponding to each true precision should be 10, but since these are discrete values, the total value in this example is 9.091.

[0045] From the above, we can calculate the probability that the actual precision rate and the true precision rate will be equal. For example, the frequency at which the actual precision rate is 50% when the true precision rate is 50% is 2.461, and the total frequency at which the actual precision rate is 50% is 9.091 as mentioned above, so the probability that the actual precision rate is 50% when the true precision rate is 50% is 2.461 / 9.091=0.27 (27%).

[0046] Figure 10 shows the probability that the measured precision rate will be 10% (0.1 in the figure) when the true precision rate is 10% (0.1 in the figure), the probability that the measured precision rate will be 20% (0.2 in the figure) when the true precision rate is 20% (0.2 in the figure), the probability that the measured precision rate will be 30% (0.3 in the figure) when the true precision rate is 30% (0.3 in the figure), the probability that the measured precision rate will be 40% (0.4 in the figure) when the true precision rate is 40% (0.4 in the figure), and the probability that the measured precision rate will be 50% (0.5 in the figure). The figures show the probability that the precision rate will be 50% (0.5 in the figure), the probability that the measured precision rate will be 60% (0.6 in the figure) when the true precision rate is 60% (0.6 in the figure), the probability that the measured precision rate will be 70% (0.7 in the figure) when the true precision rate is 70% (0.7 in the figure), the probability that the measured precision rate will be 80% (0.8 in the figure) when the true precision rate is 80% (0.8 in the figure), and the probability that the measured precision rate will be 90% (0.9 in the figure) when the true precision rate is 90% (0.9 in the figure).

[0047] The relationship between the true conformance rate (horizontal axis) and the proportion of 100 cross sections where the residual horizontal displacement was 1.5 m or less, that is, the pass rate (vertical axis), is as shown in Figure 5, so the relationship between the actual conformance rate and the proportion of 100 cross sections where the residual horizontal displacement was 1.5 m or less can be calculated from Figure 5 and Figure 10. For example, the probability that the actual conformance rate is 50% is A when the true conformance rate is 10%, B when the true conformance rate is 20%, C when the true conformance rate is 30%, ... I when the true conformance rate is 90%, and the probability that the residual horizontal displacement is 1.5 m or less when the true conformance rate is 10% is α, the probability that the residual horizontal displacement is 1.5 m or less when the true conformance rate is 20% is β, the probability that the residual horizontal displacement is 1.5 m or less when the true conformance rate is 30% is γ, ... ι when the true conformance rate is 90%. In this case, the probability that the residual horizontal displacement will be 1.5 m or less when the actual measurement conformity rate is 50% can be calculated using the formula A × α + B × β + C × γ + ··· + I × ι.

[0048] In Fig. 11, the dashed line graph shows the relationship between the true precision rate and the pass rate when the number of surveys (number of samples) is 10 (see Fig. 5), while the solid line graph shows the relationship between the measured precision rate and the pass rate when the number of surveys is 10. Also, Fig. 12 shows the relationship between the measured precision rate and the pass rate when the number of surveys is 3, 5, 10, 20, 30, 40, 50, and 432. As mentioned above, the measured precision rate is less reliable than the true precision rate. Therefore, in the relationship between the measured precision rate and the pass rate, taking into account statistical estimation error, the pass rate is set lower than the true precision rate because the measured precision rate is less reliable.

[0049] In this manner, the calculation unit 12 calculates the relationship between each measured conformance rate and the pass rate based on the occurrence frequency of the measured conformance rate at each true conformance rate and the relationship between the true conformance rate and the pass rate acquired by the acquisition unit 11.

[0050] Returning to the explanation of Fig. 3, in the relationship between the actual conformance rate and the pass rate calculated by the calculation unit for the number of surveys of the evaluation index in the evaluation target area, the evaluation unit 13 evaluates the conformance rate for the performance index in the evaluation target area by applying a calculated value in which the number of surveys of the evaluation index in the evaluation target area is the denominator and the number of surveys in which the evaluation index value satisfies the evaluation standard value is the numerator to the actual conformance rate. Specifically, in the graph in the example of Fig. 12 in which the number of surveys corresponds to 10, if the number of surveys in which the value of the unconfined compressive strength, which is the evaluation index value, satisfies the evaluation standard value is, for example, 9, it can be estimated that the pass rate corresponding to 9 / 10 = 0.9 (actual conformance rate) is about 0.99. The evaluation unit 13 performs evaluation using this estimated pass rate value.

[0051] (operation) Next, the operation of this embodiment will be described. In Fig. 13, the acquisition unit 11 acquires the relationship between the true suitability rate and the pass rate (step S11). The acquisition unit 11 may obtain the relationship between the true suitability rate and the pass rate by itself using the method described above, or may obtain the relationship between the true suitability rate and the pass rate obtained by an external device.

[0052] Next, the calculation unit 12 uses the relationship between the true fit rate and the pass rate acquired by the acquisition unit 11 to calculate the relationship between the actual fit rate and the pass rate for each survey number of the evaluation index in the evaluation target area (step S12).

[0053] Then, the evaluation unit 13 evaluates the conformance rate for the performance index in the evaluation target area by applying a calculated value, in which the number of investigations of the evaluation index in the evaluation target area is used as the denominator and the number of investigations in which the evaluation index value satisfies the evaluation standard value, to the measured conformance rate in relation to the measured pass rate calculated by the calculation unit 12 for the number of investigations of the evaluation index in the evaluation target area (step S13).

[0054] According to the embodiment described above, it is possible to apply the quality evaluation to the actual construction work, and to perform the quality evaluation of the evaluation target area after the ground improvement work.

[0055] The present invention includes a step of acquiring a relationship between a true suitability ratio calculated by a predetermined algorithm as the proportion of an area in an evaluation target area after ground improvement where an evaluation index value, which is a numerical value of an evaluation index that is an item for evaluating the ground improvement result of the evaluation target area, satisfies a predetermined evaluation standard value, and a pass rate, which is the proportion of the evaluation target area where a performance index value, which is a numerical value of a performance index that is an index item related to the performance of the evaluation target area after ground improvement, satisfies a predetermined performance standard value; and a step of statistically calculating, using the relationship between the true suitability ratio and the pass rate acquired by the acquisition step, the proportion of the area in the evaluation target area where the evaluation index value satisfies the evaluation standard value. The method may be implemented as an evaluation method for an evaluation area after ground improvement, comprising: a calculation step of calculating the relationship between the actual conformance rate, obtained by taking into account a quantitative estimation error, and the pass rate for each number of surveys of the evaluation index in the evaluation area; and an evaluation step of evaluating the conformance rate for the performance index in the evaluation area by applying to the actual conformance rate a calculated value in which the number of surveys of the evaluation index in the evaluation area is used as the denominator and the number of surveys in which the evaluation index value satisfies the evaluation standard value, in the relationship between the actual conformance rate and the pass rate calculated by the calculation step for the number of surveys of the evaluation index in the evaluation area.

[0056] The present invention also relates to a computer that includes an acquisition unit that acquires a relationship between a true suitability rate calculated by a predetermined algorithm as the proportion of an area in an evaluation target area after ground improvement where an evaluation index value, which is a numerical value of an evaluation index that is an item for evaluating the result of ground improvement in the evaluation target area, satisfies a predetermined evaluation standard value, and a pass rate that is the proportion of the evaluation target area where a performance index value, which is a numerical value of a performance index that is an index item related to the performance of the evaluation target area after ground improvement, satisfies a predetermined performance standard value, and a calculation unit that calculates a pass rate by using the relationship between the true suitability rate and the pass rate acquired by the acquisition unit. The program may be implemented as a program for implementing a calculation unit that calculates, for each number of surveys of the evaluation index in the evaluation target area, a relationship between the measured conformance rate and the pass rate, the relationship being calculated by the calculation unit for the number of surveys of the evaluation index in the evaluation target area, taking into account a statistical estimation error as a proportion of the area where the performance index value satisfies the evaluation reference value, and an evaluation unit that evaluates the conformance rate for the performance index value in the evaluation target area by applying a calculated value, in which the number of surveys of the evaluation index in the evaluation target area is used as a denominator and the number of surveys in which the evaluation index value satisfies the evaluation reference value is used as a numerator, to the measured conformance rate in the relationship between the measured conformance rate and the pass rate calculated by the calculation unit for the number of surveys of the evaluation index in the evaluation target area. This program may be provided in a state recorded on a computer-readable recording medium such as a CD-ROM (Compact Disc Read only memory), or may be downloaded via a communication network such as the Internet. [Explanation of symbols]

[0057] 10: Evaluation device, 20: Survey system, 11: Acquisition unit, 12: Calculation unit, 13: Evaluation unit, 1001: Processor, 1002: Memory, 1003: Storage, 1004: Communication device, 1005: Input device, 1006: Output device.

Claims

1. an acquisition unit that acquires the relationship between a true suitability rate calculated by a predetermined algorithm as the proportion of areas in an evaluation target area after ground improvement where an evaluation index value, which is the numerical value of an evaluation index, which is an item for evaluating the ground improvement results of the evaluation target area, satisfies a predetermined evaluation standard value, and a pass rate, which is the proportion of areas in the evaluation target area where a performance index value, which is the numerical value of a performance index, which is an index item related to the performance of the evaluation target area after ground improvement, satisfies a predetermined performance standard value; a calculation unit that uses the relationship between the true conformance rate and the pass rate acquired by the acquisition unit to calculate a relationship between an actual conformance rate obtained as a ratio of an area in the evaluation target area in which the evaluation index value satisfies the evaluation reference value and the pass rate for each survey number of the evaluation index in the evaluation target area; an evaluation unit that evaluates the conformance rate for the performance index in the evaluation target area by applying a calculated value, in which the number of investigations of the evaluation index in the evaluation target area is used as a denominator and the number of investigations in which the evaluation index value satisfies the evaluation reference value, to the measured conformance rate in the relationship between the measured conformance rate and the pass rate calculated by the calculation unit for the number of investigations of the evaluation index in the evaluation target area; An evaluation device for an evaluation target area after ground improvement comprising:

2. The evaluation index is at least one of the following: unconfined compressive strength, N value, vane shear strength, fine particle content, silica content, or density. The evaluation device according to claim 1 .

3. The calculation unit calculates the relationship between each of the measured conformance rates and the pass rate based on the frequency of occurrence of the measured conformance rate in each of the true conformance rates and the relationship between the true conformance rate and the pass rate acquired by the acquisition unit. The evaluation device according to claim 1.

4. The evaluation unit calculates the calculated value from the evaluation index value obtained by investigating a sample obtained from the evaluation target area after ground improvement. The evaluation device according to claim 1.

5. The performance index is at least one of the following: bearing capacity, displacement, and rotation angle. The evaluation device according to claim 1.

6. an acquisition step of acquiring a relationship between a true suitability rate calculated by a predetermined algorithm as the proportion of areas in which an evaluation index value, which is a numerical value of an evaluation index that is an item for evaluating the results of ground improvement in an evaluation target area after ground improvement, satisfies a predetermined evaluation standard value, and a pass rate, which is the proportion of areas in which a performance index value, which is a numerical value of a performance index that is an index item related to the performance of the evaluation target area after ground improvement, satisfies a predetermined performance standard value; a calculation step of calculating, using the relationship between the true conformance rate and the pass rate acquired by the acquisition step, a relationship between an actual conformance rate obtained as a ratio of an area in the evaluation target area in which the evaluation index value satisfies the evaluation reference value and the pass rate for each survey number of the evaluation index in the evaluation target area; an evaluation step of evaluating the conformance rate for the performance index in the evaluation target area by applying a calculated value, in which the number of investigations of the evaluation index in the evaluation target area is used as a denominator and the number of investigations in which the evaluation index value satisfies the evaluation standard value, to the measured conformance rate in the relationship between the measured conformance rate and the pass rate calculated in the calculation step for the number of investigations of the evaluation index in the evaluation target area; A method for evaluating an area to be evaluated after ground improvement, comprising:

7. On the computer, an acquisition unit that acquires the relationship between a true suitability rate calculated by a predetermined algorithm as the proportion of areas in an evaluation target area after ground improvement where an evaluation index value, which is the numerical value of an evaluation index, which is an item for evaluating the ground improvement results of the evaluation target area, satisfies a predetermined evaluation standard value, and a pass rate, which is the proportion of areas in the evaluation target area where a performance index value, which is the numerical value of a performance index, which is an index item related to the performance of the evaluation target area after ground improvement, satisfies a predetermined performance standard value; a calculation unit that uses the relationship between the true conformance rate and the pass rate acquired by the acquisition unit to calculate a relationship between an actual conformance rate obtained as a ratio of an area in the evaluation target area in which the evaluation index value satisfies the evaluation reference value and the pass rate for each survey number of the evaluation index in the evaluation target area; an evaluation unit that evaluates the conformance rate for the performance index value in the evaluation target area by applying a calculated value, in which the number of investigations of the evaluation index in the evaluation target area is used as a denominator and the number of investigations in which the evaluation index value satisfies the evaluation reference value, to the measured conformance rate in the relationship between the actual conformance rate and the pass rate calculated by the calculation unit for the number of investigations of the evaluation index in the evaluation target area; A program to achieve this.

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