Three-dimensional geological model correction device, method, and program

Abstract

To provide a three-dimensional geological model correction device, method, and program that can quickly and effectively correct a three-dimensional geological model using strata information obtained from face observation.SOLUTION: A three-dimensional geological model correction device comprises: three-dimensional geological model generation means 30 for generating a three-dimensional geological model of a construction target including three-dimensional coordinates and three-dimensional stratum boundary data based on previously acquired stratum information of the construction target; face image acquisition means 21 for acquiring a face image of an already excavated area; face coordinate acquisition means 22 for acquiring three-dimensional coordinates of the face image; two-dimensional stratum boundary data extraction means 23 for extracting two-dimensional stratum boundary data from the face image; identical boundary extraction means 40 for extracting identical boundaries based on proximity of three-dimensional coordinates of boundary lines constituting the three-dimensional stratum boundary data and the boundary lines constituting the two-dimensional stratum boundary data; and three-dimensional stratum boundary data correction means 50 for correcting the three-dimensional stratum boundary data based on the two-dimensional stratum boundary data related to the extracted identical boundaries.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technique for predicting the natural ground ahead in tunnel construction work. [Background technology]

[0002] It is extremely difficult to predict the uncertain nature of the ground ahead during tunnel construction. It is common to make various estimates using existing seismic exploration and previous boring information. Therefore, there is known an information processing device that generates a 3D geological model in advance using drilling data, etc., and updates the 3D geological model using information obtained during construction (see Patent Document 1). The device disclosed in Patent Document 1 includes a model creation unit that creates a 3D geological model of the construction target based on geological information about the construction target obtained before the construction, and a model update unit that updates the 3D geological model based on exploration information, which is information about the construction target explored during construction, and is capable of more accurately and sequentially grasping the state of the construction target.

[0003] Patent Document 1 also describes updating a 3D geological model based on strata obtained from observations of the excavated area, but does not disclose in detail how the strata obtained from observations of the excavated area are used or by what method the 3D geological model is updated. Furthermore, when updating a 3D geological model based on strata obtained from face observations of already excavated areas, it is assumed that the positions of strata boundaries or boundaries between hard and soft rocks in the 3D geological model will be identified based on exploration information. The exploration information here includes information on elastic wave velocity obtained from advanced drilling or blasting seismic exploration, lithology classification from advanced drilling, physical property classification from strength tests, and information on elastic wave reflection surfaces. In other words, it is essential to update the 3D geological model using this exploration information in combination with information on strata obtained from face observations of already excavated areas. However, there was a problem in that the 3D geological model could not be updated using only the information on strata obtained from face observations of already excavated areas. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-141080 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this situation, the present invention aims to provide a 3D geological model correction device, method, and program that can quickly and effectively correct a 3D geological model using strata information obtained from face observations. [Means for solving the problem]

[0006] In order to solve the above problems, the three-dimensional geological model correction device of the present invention comprises a three-dimensional geological model generation means for generating a three-dimensional geological model of the construction target including three-dimensional coordinates and three-dimensional geological boundary data based on previously acquired geological information of the construction target, a face image acquisition means for acquiring a face image of the already excavated area, a face coordinate acquisition means for acquiring the three-dimensional coordinates of the face image, a two-dimensional geological boundary data extraction means for extracting two-dimensional geological boundary data from the face image, an identical boundary extraction means for extracting identical boundaries based on the proximity of the boundary lines constituting the three-dimensional geological boundary data and the three-dimensional coordinates of the boundary lines constituting the two-dimensional geological boundary data, and a three-dimensional geological boundary data correction means for correcting the three-dimensional geological boundary data based on the two-dimensional geological boundary data related to the extracted identical boundaries, and corrects the differences in the geological quality of the face surface to be actually excavated each time, assuming the hardness or softness of the tunnel excavation portion.

[0007] By generating a 3D geological model from advance information that identifies the geological model and cutting out the tunnel section, it is possible to estimate the hardness of the tunnel excavation section and correct differences in the geological conditions of the actual excavation face as they occur, thereby making it possible to pursue greater accuracy from ambiguous information. By estimating wide-area geological blocks from a 3D geological model and overlaying the alignment in tunnel design, it will be possible to pursue the reliability of construction, for example, by using information from the first phase of a road tunnel that was previously constructed to obtain more accurate geological information when constructing a second phase tunnel with four lanes. In addition, it is possible to identify weak geology from the 3D geological model and evaluate the adoption of tunnel auxiliary construction methods in 3D. For example, tunnel excavation areas are usually excavated about 1m or 1.2m, but by utilizing the above-mentioned stratum correction model to some extent, it is possible to pursue the appropriateness of forepiling work. In the three-dimensional geological model generating means, the previously acquired geological layer information of the construction target is preferably boring data.

[0008] In the 3D geological model correction device of the present invention, the identical boundary extraction means may prompt the user to manually input 2D stratum boundary data when multiple boundary lines having a proximity greater than a predetermined threshold are extracted, or when no boundary lines having a proximity greater than the predetermined threshold are extracted. If multiple boundary lines having a proximity greater than the predetermined threshold are extracted, or when no boundary lines having a proximity greater than the predetermined threshold are extracted, there is a high possibility that an incorrect boundary line will be extracted or no boundary line will be extracted. Therefore, by prompting the user to manually input, more accurate correction of the 3D geological model is possible.

[0009] The 3D geological model correction device of the present invention preferably further comprises a 2D geological attribute data extraction means for extracting geological attribute data from the face image, a 3D geological model generation means for generating a 3D geological model including the geological attribute data, and an identical boundary extraction means for extracting identical boundaries by comparing the geological attribute data. By using geological attribute data in addition to boundaries, it is possible to extract identical boundaries with higher accuracy. The geological attribute data includes, for example, topsoil, clay, silt layer, sand layer, gravel layer, and the soil type and color tone that indicate these.

[0010] The 3D geological model modification device of the present invention may further comprise a guidance output means for further estimating a specific area from the 3D stratum boundary data modified by the 3D stratum boundary data modification means and outputting guidance for continuing or changing the support pattern, thereby contributing to safe and smooth construction of tunnels.

[0011] The 3D geological model correction device of the present invention may further comprise a guidance output means for estimating the extent of impact during tunnel excavation or measures to prevent ground surface subsidence during construction in a small earth covering section from the 3D stratum boundary data corrected by the 3D stratum boundary data correction means, and outputting guidance regarding construction safety, thereby contributing to safe and smooth tunnel construction.

[0012] The three-dimensional geological model correction device of the present invention may further include a report output means for extracting at least one of unfolded view data, cross-sectional view data, and longitudinal section data from the three-dimensional geological boundary data corrected by the three-dimensional geological boundary data correction means, and outputting a face observation record book. By automatically extracting unfolded, cross-sectional, and longitudinal section data from the 3D geological model, the face observation record book that was previously required to be submitted to the client can be created almost automatically, thereby improving work efficiency.

[0013] The 3D geological model correction device of the present invention may also include a comparison means for extracting at least one of development view data, cross-sectional view data, and longitudinal section data from the 3D geological boundary data corrected by the 3D geological boundary data correction means and comparing the same boundary lines with previously stored data of the same type. This allows the plan view, longitudinal section, and cross-sectional view in the 2D representation to be displayed side by side with past data and compared. These comparisons are then visually displayed via a graphical user interface, and the 2D representation is automatically generated based on user selection. Furthermore, the plan view, longitudinal section, and cross-sectional view can be arranged on a time axis and compared chronologically. The device may also include a function for automatically detecting differences resulting from the comparison results and reporting them to the user.

[0014] In the 3D geological model modification device of the present invention, the 3D geological model is preferably a solid model expressed by a polygon mesh solid to which attribute information of the strata is assigned. By using a solid model expressed by a polygon mesh solid rather than a voxel model, a smoother and more accurate 3D model can be generated.

[0015] Next, the three-dimensional geological model correction method of the present invention will be described. The three-dimensional geological model correction method of the present invention comprises a three-dimensional geological model generation step of generating a three-dimensional geological model of a construction target including three-dimensional coordinates and three-dimensional stratum boundary data based on previously acquired stratum information of the construction target; a face image acquisition step of acquiring a face image of the already excavated area; a face coordinate acquisition step of acquiring the three-dimensional coordinates of the face image; a two-dimensional stratum boundary data extraction step of extracting two-dimensional stratum boundary data from the face image; an identical boundary extraction step of extracting identical boundaries based on the proximity of the three-dimensional coordinates of the boundaries constituting the three-dimensional stratum boundary data and the boundaries constituting the two-dimensional stratum boundary data; and a three-dimensional stratum boundary data correction step of correcting the three-dimensional stratum boundary data based on the two-dimensional stratum boundary data related to the extracted identical boundaries. This allows the hardness of the tunnel excavation section to be estimated, and adjustments can be made each time to account for differences in the geological conditions at the actual excavation face.

[0016] The three-dimensional geological model correction program of the present invention causes a computer to execute each step of the three-dimensional geological model correction method described above. [Effects of the Invention]

[0017] According to the present invention, it is possible to quickly and effectively correct a three-dimensional geological model using strata information obtained from observation of the tunnel face. [Brief explanation of the drawings]

[0018] [Figure 1] Functional block diagram of the 3D geological model correction device of the first embodiment [Figure 2] Schematic flow diagram of the 3D geological model correction method of Example 1 [Figure 3] Image of the 3D geological model [Figure 4] Image of the working face [Figure 5] Image of boundary line assignment [Figure 6] 3D geological model and image of the working face [Figure 7] 3D geological model [Figure 8] Illustration of the same boundary line extraction method [Figure 9] Flowchart of identical boundary line extraction [Figure 10] Identical boundary extraction image (1) [Figure 11] Identical boundary extraction image (2) [Figure 12] Identical boundary extraction image (3) [Figure 13] 3D geological model correction image (1) [Figure 14] 3D geological model correction image (2) [Figure 15] Flowchart of extraction of identical boundary lines (Example 2) [Figure 16] Descriptive diagram of identical boundary line extraction (Example 2) [Figure 17] Functional block diagram of the 3D geological model correction device (Example 3) [Figure 18] Boundary line assignment image (Example 3) [Figure 19] 3D geological model correction image (Example 3) [Figure 20] Explanatory diagram 1 of the form output means (Example 3) [Figure 21] Explanatory diagram 2 of the form output means (Example 3) [Figure 22] Illustrative diagram of comparison means (Example 3) DETAILED DESCRIPTION OF THE INVENTION

[0019] An example of an embodiment of the present invention will be described in detail below with reference to the drawings. Note that the scope of the present invention is not limited to the following examples and illustrated examples, and many modifications and variations are possible. [Example]

[0020] An embodiment of the three-dimensional geological model modification device will now be described. Fig. 1 shows a functional block diagram of a 3D geological model modification device. The 3D geological model modification device 1 is composed of a 3D geological model generation means 30, a 2D geological data generation means 20, an identical boundary extraction means 40, and a 3D geological boundary data modification means 50. The three-dimensional geological model generating means 30 generates a three-dimensional geological model of the construction target, including three-dimensional coordinates and three-dimensional stratum boundary data, based on previously acquired stratum information of the construction target. The two-dimensional stratum data generation means 20 processes face images of the already excavated range into two-dimensional stratum data to be used for correcting the three-dimensional geological model, and includes a face image acquisition means 21, a face coordinate acquisition means 22, and a two-dimensional stratum boundary data extraction means 23. The face image acquisition means 21 acquires face images of the already excavated range, and the face coordinate acquisition means 22 acquires the three-dimensional coordinates of the face images. The two-dimensional stratum boundary data extraction means 23 extracts two-dimensional stratum boundary data from the face images. The identical boundary extraction means 40 extracts identical boundaries based on the proximity of the three-dimensional coordinates of the boundaries constituting the three-dimensional stratum boundary data and the boundaries constituting the two-dimensional stratum boundary data as a criterion. The three-dimensional stratum boundary data correction means 50 corrects the three-dimensional stratum boundary data based on the two-dimensional stratum boundary data related to the extracted identical boundaries.

[0021] Figure 2 shows a schematic flow diagram of the 3D geological model correction method. First, a 3D geological model of the construction target is generated based on previously acquired geological layer information of the construction target (step S01). In this case, multiple borehole data are used as the previously acquired geological layer information of the construction target. The database to be used can preferably be the borehole log published on the "KuniJiban" national ground information search site. Figure 3 shows an example of an image diagram of the generation of a 3D geological model. As shown in Figure 3, a 3D geological model 300 is generated based on multiple borehole data (5a to 5c). Since each of the borehole data (5a to 5c) contains recorded 3D coordinates, strata boundaries, and geological information, the 3D geological model 300 with smooth boundaries is generated by estimating data near each borehole data and data between the borehole data based on this data. The 3D geological model 300 is a solid model expressed by a polygon mesh solid to which attribute information of the geological layers is assigned. By using a solid model expressed by a polygon mesh solid rather than a voxel model, a smoother and more accurate 3D geological model can be generated.

[0022] Next, as shown in Fig. 2, a face image of the already excavated range is acquired (step S02). Fig. 4 shows an example of an image of a face image. As shown in Fig. 4, a captured image 200 of the face surface of the already excavated range in tunnel construction is acquired, and a face image 2 is acquired by cutting out the face surface from the captured image 200. The face image acquisition means 21 accepts input of the captured image 200 and automatically cuts out the face image 2 from the input captured image 200, but instead of automatic cutting out, manual cutting (trimming) by the user may also be accepted.

[0023] After acquiring the face image 2, the three-dimensional coordinates of the face image 2 are acquired using the face coordinate acquisition means 22 (step S03). The three-dimensional coordinates are acquired using a camera that captured the captured image 200, a 3D laser scanner, a total station, or the like. A target such as a prism may also be used for acquisition. Further, the two-dimensional stratum boundary data extraction means 23 is used to extract two-dimensional stratum boundary data from the working face image 2 (step S04). In the boundary line assignment image diagram shown in FIG. 5, boundary lines (2a to 2c) are drawn in the working face image 2. The two-dimensional stratum boundary data extraction means 23 automatically extracts the boundary lines of the stratum from the working face image 2, but may also accept manual extraction operations by the user. The extraction of the two-dimensional stratum boundary data (step S04) may be performed before the acquisition of three-dimensional coordinates (step S03).

[0024] The data obtained by acquiring three-dimensional coordinates and extracting two-dimensional stratum boundary data for the drilling face image 2 is referred to here as two-dimensional stratum data. In this way, the two-dimensional stratum data generating means 20 generates two-dimensional stratum data using the drilling face image acquiring means 21, the drilling face coordinate acquiring means 22, and the two-dimensional stratum boundary data extracting means 23. The generated two-dimensional stratum data is used to correct the data of the aforementioned three-dimensional geological model. For the correction, it is necessary to extract boundaries in the two-dimensional stratum data that are identical to boundaries in the three-dimensional geological model. Therefore, identical boundaries are extracted based on the proximity of the three-dimensional coordinates of the boundaries constituting the three-dimensional stratum boundary data and the boundaries constituting the two-dimensional stratum boundary data (step S05).

[0025] Figure 6 shows an image of a 3D geological model and a working face image. As shown in Figure 6, the generated 3D geological model 3 includes data on strata (4a-4g) as 3D geological attribute data 30c and data on boundaries (3a-3f) as 3D strata boundary data 30b. The 3D geological attribute data 30c refers to data on topsoil, clay, silt, sand, and gravel layers, as well as soil type and color tone that indicate these. The 3D coordinate data 30a is based on the 3D coordinate data obtained from the boring log. For convenience, hidden lines in the strata (4d-4g) have been removed from the 3D geological model 3 shown in Figure 6. The two-dimensional stratum boundary data relating to the face image 2 is fitted to the three-dimensional geological model 3, and the two-dimensional stratum boundary data relating to the face image 2 is treated as "correct" and corrections are made. The three-dimensional geological model 3 and the face image 2 are aligned by aligning their respective three-dimensional coordinates.

[0026] Figure 7 shows an image of a three-dimensional geological model. For ease of explanation, the three-dimensional geological model 3 shown in Figure 7 is a two-dimensional representation of the area corresponding to the working face image 2, but in reality it is a three-dimensional model as shown in Figure 6. As shown in Figure 7, the three-dimensional geological model 3 displays strata (4b to 4e) and boundary lines (3b to 3d).

[0027] Here, a method for extracting identical boundaries will be described. Fig. 8 is an explanatory diagram of the identical boundary extraction method. In the example shown in Fig. 8, boundary lines (300c, 300d) of two 3D geological models 301, one above the other, are displayed in the vertical direction of boundary line 200b on the face image. The vertical distance between boundary lines (300c, 300d) above and below boundary line 200b is calculated, and boundaries with proximity exceeding a predetermined distance D are extracted as identical boundaries. The distance is calculated based on three-dimensional coordinates. Here, for example, at point P1 on boundary line 200b, distance D2 to boundary line 300d below is longer than distance D, and therefore cannot be considered a boundary line with proximity exceeding distance D. In contrast, distance D1 to boundary line 300c above is shorter than distance D, and therefore can be considered a boundary line with proximity exceeding distance D. Similarly, at point P2 on boundary line 200b, distance D4 to boundary line 300d below is longer than distance D, and therefore cannot be considered a boundary line with proximity exceeding distance D, but distance D3 to boundary line 300c above is shorter than distance D, and therefore can be considered a boundary line with proximity exceeding distance D. Although only points (P1, P2) are taken up here, in reality, all pixels on boundary line 200b and boundary line (300c, 300d) are compared, the average value is calculated, and the judgment is made. This also applies to the following explanation.

[0028] Fig. 9 shows a flow diagram for extracting identical boundaries. Fig. 10 to Fig. 12 are conceptual diagrams of extracting identical boundaries, with Fig. 10 showing an image of extracting identical boundaries for boundary line 2a, Fig. 11 showing an image of extracting identical boundaries for boundary line 2b, and Fig. 12 showing an image of extracting identical boundaries for boundary line 2c. As shown in FIG. 9, in the extraction of identical boundaries (step S05), two upper and lower three-dimensional stratum boundaries existing in the perpendicular direction to the two-dimensional stratum boundary line are extracted based on the three-dimensional coordinate data (step S51). First, for boundary line 2a, boundaries (3b to 3d) are displayed as three-dimensional geological boundary lines in FIG. 10. For example, for point P3, boundary line 3b located above boundary line 2a and boundary line 3c located below boundary line 2a are extracted as two three-dimensional geological boundary lines located above and below boundary line 2a in the perpendicular direction. Boundary line 3d also exists below boundary line 2a, but boundary line 3c, which is closer to point P3, is preferentially extracted. Similarly, for points (P4, P5), boundary line 3b located above boundary line 2a and boundary line 3c located below boundary line 2a are extracted. Next, for the boundary line 2b, a boundary line 3c above the boundary line 2b and a boundary line 3d below the boundary line 2b are extracted for the point P6, as shown in Fig. 11. On the other hand, for the points (P7, P8), a boundary line 3b above the boundary line 2b and a boundary line 3c below the boundary line 2b are extracted. As for the boundary line 2c, as shown in FIG. 9, P 10 ,P 11 ), a boundary line 3c that exists above the boundary line 2c and a boundary line 3d that exists below the boundary line 2c are extracted.

[0029] Next, the proximity of the two three-dimensional stratum boundary lines to the two-dimensional stratum boundary line is determined (step S52). Here, the determination is made using the same boundary line extraction method described above. Here, as shown in FIG. 10, the boundary line 2a is 3,In P4 and P5), the distance to the boundary line 3c below is longer than the specified distance D, and therefore it cannot be said that the boundary line has a proximity that exceeds distance D. However, the distance to the boundary line 3b above is shorter than distance D, and therefore it can be said that the boundary line has a proximity that exceeds distance D. Furthermore, as shown in FIG. 11, at point P6, the distance between boundary line 2b and boundary line 3d below is longer than distance D, and boundary line 2b cannot be said to be a boundary line having proximity exceeding distance D, but the distance between boundary line 2b and boundary line 3c above is shorter than distance D, and boundary line 2b can be said to be a boundary line having proximity exceeding distance D. Furthermore, at points (P7, P8), the distance between boundary line 2b and boundary line 3b above is longer than distance D, and boundary line 2b cannot be said to be a boundary line having proximity exceeding distance D, but the distance between boundary line 2b and boundary line 3c below is shorter than distance D, and boundary line 2b can be said to be a boundary line having proximity exceeding distance D. Furthermore, as shown in FIG. 12, the boundary line 2c is 9, P 10 ,P 11 ) the distance to the boundary line 3c above is longer than distance D, and therefore it cannot be said that the boundary line has a proximity that exceeds distance D, but the distance to the boundary line 3d below is shorter than distance D, and therefore it can be said that the boundary line has a proximity that exceeds distance D.

[0030] Then, the three-dimensional stratum boundary lines that are found to be close to each other are extracted as the same boundary lines as the two-dimensional stratum boundary lines (step S53). In this way, based on the closeness between the boundaries (3b to 3d) and the boundaries (2a to 2c), the boundary lines 3b and 2a, the boundary lines 3c and 2b, or the boundary lines 3d and 2c are extracted as the same boundary lines.

[0031] The three-dimensional stratum boundary data is corrected using the extracted two-dimensional stratum boundary data for the same boundary as a reference (step S06). Figures 13 and 14 show an image of the three-dimensional geological model correction in Example 1. As shown in Figure 13, boundary line 2a in the working face image 2 is set to be positive, and then smoothing processing is performed to match boundary line 2a in the working face image 2, thereby correcting boundary line 3b. Similarly, boundary line (2b, 2c) in the working face image 2 is set to be positive, and then smoothing processing is performed to match boundary line (2b, 2c), thereby correcting boundary line (3c, 3d). Figure 14 shows the corrected three-dimensional geological model 31 from which the working face image 2 has been removed. While shown in two dimensions here, in reality, the correction is also reflected in three-dimensional boundaries (3b to 3d) as shown in Figure 6. [Example]

[0032] Next, the method for extracting identical boundaries will be described. Steps other than step S05 for extracting identical boundaries are the same as the flow of the 3D geological model correction method of the first embodiment shown in Figure 2. Figure 15 shows a flow diagram of identical boundary extraction of the second embodiment. Regarding the step of extracting identical boundaries shown in Fig. 2 (step S05), as shown in Fig. 15, first, two upper and lower three-dimensional stratum boundary lines existing in the perpendicular direction to the two-dimensional stratum boundary line are extracted based on the three-dimensional coordinate data (step S501). It is determined whether a proximity greater than a predetermined threshold is recognized for either of the three-dimensional stratum boundary lines (step S502). If a proximity greater than the predetermined threshold is recognized for either of the three-dimensional stratum boundary lines, the three-dimensional stratum boundary line recognized as being adjacent is extracted as the same boundary line as the two-dimensional stratum boundary line (step S503). This process is the same as the flow of the three-dimensional geological model correction method of the first embodiment. On the other hand, if a determination is made (step S502) as to whether a proximity greater than a predetermined threshold is found for either of the three-dimensional stratum boundary lines, and multiple boundaries with a proximity greater than the predetermined threshold are extracted, or if no boundaries with a proximity greater than the predetermined threshold are extracted, the user is prompted to manually input a three-dimensional stratum boundary line to be extracted as the same boundary line as the two-dimensional stratum boundary line (step S504).

[0033] FIG. 16 is an explanatory diagram of the extraction of identical boundaries in Example 2, where (1) shows a case where multiple boundaries with proximity greater than a predetermined threshold are extracted, and (2) shows a case where no boundaries with proximity greater than a predetermined threshold are extracted. Comparing the boundaries (3g, 3h) in the three-dimensional geological model 301 shown in FIG. 16(1) with boundary line 2d, it is found that boundary line 2d is located at point (P 12 ~P 14 ), the distance (D5, D7, D9) between the boundary line 3g above the boundary line 3g is shorter than the predetermined distance D, and the boundary line can be said to have proximity exceeding the distance D. Also, the distance (D6, D8, D9) between the boundary line 3h below the boundary line 3g is shorter than the predetermined distance D, and the boundary line can be said to have proximity exceeding the distance D. 10 ) is also a boundary line that is shorter than distance D and has a proximity greater than distance D. In this way, when multiple boundaries with a proximity greater than the predetermined threshold are extracted, there is a high possibility that an incorrect boundary line will be extracted, so by prompting the user to enter manual input, more accurate correction of the 3D geological model is possible.

[0034] Furthermore, when comparing the boundary line (3i, 3j) in the three-dimensional geological model 302 shown in FIG. 16(2) with the boundary line 2d, it is found that the boundary line 2d is located at the point (P 15 ~P 17 ) and the boundary line 3i above (D 11 ,D 13 ,D 15 ), the distance is longer than the predetermined distance D, and it cannot be said that the boundary line has proximity exceeding the distance D. Also, the distance (D 12 ,D 14 ,D 16) is also longer than distance D, and cannot be said to be a boundary line with a proximity exceeding distance D. In this way, if a boundary line with a proximity greater than the predetermined threshold is not extracted, there is a high possibility that the boundary line will not be extracted, so by prompting the user to enter manual input, more accurate correction of the 3D geological model is possible. [Example]

[0035] Another embodiment of the three-dimensional geological model modifying device will now be described. Figure 17 shows a functional block diagram of the 3D geological model modification device of this embodiment. As shown in Figure 17, the 3D geological model modification device 10 differs from the 3D geological model modification device 1 of the first embodiment in that it further comprises a 2D geological attribute data extraction means 24, a guidance means 60, a report output means 70, and a comparison means 80. The other components are the same as those of the 3D geological model modification device 1 of the first embodiment. The two-dimensional geological attribute data extraction means 24 extracts geological attribute data from the face image. Here, the geological attribute data (two-dimensional geological attribute data) refers to data on topsoil, clay, silt layer, sand layer, gravel layer, and the soil type and color tone that indicate these. As in the first embodiment, the three-dimensional geological model generation means 30 is capable of generating a three-dimensional geological model that includes geological attribute data, so the identical boundary extraction means 40 compares the geological attribute data and extracts identical boundaries. By using geological attribute data in addition to boundaries, it is possible to extract identical boundaries with higher accuracy.

[0036] Fig. 18 shows an image of boundary lines added in this embodiment. As shown in Fig. 18, unlike the image of boundary lines added in Example 1 (see Fig. 5), not only boundary lines (2a to 2c) but also layers (4b to 4e) are displayed in the working face image 201. Figure 19 shows an image of the correction of the 3D geological model in this embodiment. The 3D geological model 32 has at least data on strata (4b-4e) as 3D geological attribute data 30c and data on boundaries (3b-3d) as 3D geological boundary data 30b. Furthermore, the 2D geological attribute data extraction means 24 extracts data on the strata (4b-4e) as 2D geological attribute data, and the 2D geological boundary data extraction means 23 extracts data on boundaries (2a-2c) as 2D geological boundary data. Therefore, when extracting identical boundaries between the two-dimensional stratum boundary data and the three-dimensional stratum boundary data 30b, the identity of the geological attribute data immediately above and below the boundary is used as a criterion to determine whether the boundary is identical and extract it. Specifically, the strata (4b, 4c) immediately above and below boundary line 2a and the strata (4b, 4c) immediately above and below boundary line 3b are common, and this can be used as a clue to extract identical boundaries. Similarly, the strata (4c, 4d) immediately above and below boundary line 2b are common to the strata (4c, 4d) immediately above and below boundary line 3c, and the strata (4d, 4e) immediately above and below boundary line 2c are common to the strata (4d, 4e) immediately above and below boundary line 3d, and this can be used as a clue to extract identical boundaries. In this way, by extracting identical boundaries not only based on the proximity of the boundary line's three-dimensional coordinates, but also based on the identity of the geological attribute data, it becomes possible to modify the three-dimensional geological model more accurately.

[0037] The guidance means 60 further estimates specific areas from the three-dimensional stratum boundary data 30b corrected by the three-dimensional stratum boundary data correction means 50, and outputs guidance on continuing or changing the support pattern. This contributes to safe and smooth construction in tunnel construction. In addition, the guidance means 60 estimates measures to prevent ground surface subsidence in construction in light soil-covered sections or the range of impact during tunnel excavation from the three-dimensional stratum boundary data 30b corrected by the three-dimensional stratum boundary data correction means 50, and outputs guidance on construction safety. This contributes to safe and smooth construction in tunnel construction.

[0038] The report output means 70 extracts any or all of the development data, cross section data, and longitudinal section data from the three-dimensional stratum boundary data 30b corrected by the three-dimensional stratum boundary data correction means 50, and outputs a face observation record book. By automatically extracting the development data, cross section data, and longitudinal section data from the three-dimensional geological model, the face observation record book that was previously to be submitted to the client can be created almost automatically, thereby improving work efficiency.

[0039] 20 and 21 are explanatory diagrams of the report output means 70. FIG. 20(1) shows a working face image 201. With respect to the portion of the three-dimensional geological model 33 (see FIG. 21) corresponding to the working face image 201, FIG. 20(2) shows a portion 81a to be used as a development view. FIG. 20(3) shows an image of the portion to be used as a longitudinal section as portion 81b. FIG. 20(4) shows an image of the portion to be used as a cross section as portion 81c. Although not shown for the sake of convenience, the portion 81a shown in FIG. 20(2) is cut out with a width outside the curved portion of the working face image 201 and displayed as a development view on a display (not shown). Furthermore, for longitudinal sections and cross-sectional views, the areas extracted as longitudinal section data and cross-sectional view data are not limited to the areas shown in Figure 20(3) or (4), and the area 81b shown in Figure 20(3) may be moved left and right, and the area 81c shown in Figure 20(4) may be moved up and down. The three-dimensional geological model 33 shown in Fig. 21 is a three-dimensional geological model that reflects three-dimensional stratum boundary data 30b corrected by the three-dimensional stratum boundary data correction means 50 using the working face image 201. It is possible to extract the development data, cross-sectional view data, and longitudinal section data shown in Fig. 20 from the three-dimensional coordinates of the part corresponding to the working face image 201.

[0040] The comparison means 80 shown in Figure 17 extracts at least one of the development data, cross-sectional view data, and longitudinal section data from the three-dimensional stratum boundary data 30b corrected by the three-dimensional stratum boundary data correction means 50, and compares the same boundary lines with data of the same type that has been saved in the past. Fig. 22 is an explanatory diagram of the comparison means 80. As shown in Fig. 22, for the excavation face image 201, a development view of the region 81a is displayed as a display image 810a. Furthermore, a longitudinal section view of the region 81b is displayed as a display image 810b, and a cross section view of the region 81c is displayed as a display image 810c. As shown in the excavation face images (201a to 201d), as the excavation work progresses, development view data, cross section data, and longitudinal section data are extracted from images obtained from excavation face observations in the same way as for the excavation face image 201, and the same boundary lines are compared with data of the same type that has been saved in the past. As described above, the 3D geological model correction device 10 of this embodiment has the function of displaying and comparing past data side by side using plan views, longitudinal sections, and cross sections in 2D representations. These comparisons are visually displayed via a graphical user interface (GUI), and the 2D representations are automatically generated based on user selections. Furthermore, the plan views, longitudinal sections, and cross sections can be arranged on a time axis, allowing for chronological comparisons. The device may also have the function of automatically detecting differences resulting from the comparison results and reporting them to the user.

[0041] In addition, since the three-dimensional stratum boundary data correction means 50 corrects not only the three-dimensional stratum boundary data 30b but also the three-dimensional geological attribute data 30c, the corrected three-dimensional geological attribute data 30c may be used in the guidance means 60, report output means 70, or comparison means 80.

[0042] (Other Examples) Unlike the identical boundary line extraction method shown in Example 1, the vertical distance between the boundary lines (300c, 300d) located above and below the boundary line 200b shown in Figure 8 may be calculated, and the distance from the boundary line 200b to the boundary line 300c may be compared with the distance from the boundary line 200b to the boundary line 300d to determine proximity. In such a case, for example, the distances are compared for all pixels between the boundary line 200b and the boundary lines (300c, 300d), and the average value is calculated to perform the determination. Furthermore, the identical boundary line extraction method shown in Example 1 or 2 or the identical boundary line extraction method of Example 3 using two-dimensional geological attribute data may be used in combination with such a distance comparison method. [Industrial Applicability]

[0043] The present invention is useful for predicting the ground conditions ahead in tunnel construction work. [Explanation of symbols]

[0044] 1,10 3D geological model correction device 2,201,201a~201d Face images 2a~2d,3a~3h,200a,200b,300a,300b border 3,31~33,300~302 3D Geological Model 4a~4g,400a~400c strata 5a~5c Boring data 20 2D geological data generation means 21. Means for acquiring face images 22 Face coordinate acquisition means 23 2D layer boundary data extraction method 24 2D geological attribute data extraction method 30 3D geological model generation tool 30a 3D coordinate data 30b 3D layer boundary data 30c 3D geological attribute data 40 Same boundary extraction means 50 3D layer boundary data correction method 60 Guidance output means 70 Report output means 80 Comparison means 81a~81c parts 200 captured images 810a~810c Display image D, D1~D 16 distance P1~P 15 point

Claims

1. a three-dimensional geological model generating means for generating a three-dimensional geological model of the construction target, including three-dimensional coordinates and three-dimensional stratum boundary data, based on previously acquired geological layer information of the construction target; a face image acquisition means for acquiring a face image of an already excavated area; a face coordinate acquisition means for acquiring three-dimensional coordinates of the face image; a two-dimensional stratum boundary data extraction means for extracting two-dimensional stratum boundary data from the face image; an identical boundary extraction means for extracting identical boundaries based on the proximity of three-dimensional coordinates of a boundary line constituting the three-dimensional stratum boundary data and a boundary line constituting the two-dimensional stratum boundary data; a three-dimensional stratum boundary data correction means for correcting the three-dimensional stratum boundary data based on the two-dimensional stratum boundary data relating to the extracted identical boundary; The three-dimensional geological model correction device is characterized by estimating the hardness of the tunnel excavation section and correcting the difference in the geological condition of the tunnel face that is actually excavated each time.

2. The three-dimensional geological model correction device according to claim 1, characterized in that the identical boundary extraction means prompts the user to manually input two-dimensional strata boundary data when multiple boundary lines with a proximity greater than a predetermined threshold are extracted, or when no boundary lines with a proximity greater than a predetermined threshold are extracted.

3. further comprising a two-dimensional geological attribute data extraction means for extracting geological attribute data from the face image; the three-dimensional geological model generating means generates a three-dimensional geological model including geological attribute data; 2. The three-dimensional geological model modifying device according to claim 1, wherein said identical boundary extracting means extracts identical boundary lines by comparing said geological attribute data.

4. The three-dimensional geological model correction device according to claim 1, further comprising a guidance output means for further estimating a specific area from the three-dimensional geological boundary data corrected by the three-dimensional geological boundary data correction means and outputting guidance for continuing or changing the support pattern.

5. The three-dimensional geological model correction device according to claim 1, further comprising a guidance output means for estimating the extent of impact during tunnel excavation or measures to prevent ground surface subsidence during construction in areas with small soil cover from the three-dimensional geological boundary data corrected by the three-dimensional geological boundary data correction means, and outputting guidance regarding construction safety.

6. The three-dimensional geological model correction device according to claim 1, further comprising a report output means for extracting at least one of development view data, cross-sectional view data, and longitudinal section data from the three-dimensional geological boundary data corrected by the three-dimensional geological boundary data correction means, and outputting a face observation record book.

7. The three-dimensional geological model correction device according to claim 1, further comprising a comparison means for extracting at least one of development view data, cross-sectional view data, and longitudinal section data from the three-dimensional geological boundary data corrected by the three-dimensional geological boundary data correction means, and comparing the same boundary lines with data of the same type that has been stored in the past.

8. 8. A three-dimensional geological model modification device according to claim 1, wherein the three-dimensional geological model is a solid model expressed by a polygon mesh solid to which attribute information of the strata is given.

9. a three-dimensional geological model generation step of generating a three-dimensional geological model of the construction target, including three-dimensional coordinates and three-dimensional stratum boundary data, based on previously acquired geological layer information of the construction target; a face image acquisition step for acquiring a face image of an already excavated area; a face coordinate acquisition step of acquiring three-dimensional coordinates of the face image; a two-dimensional stratum boundary data extraction step of extracting two-dimensional stratum boundary data from the face image; an identical boundary extraction step of extracting identical boundaries based on the proximity of three-dimensional coordinates of boundaries constituting the three-dimensional stratum boundary data and boundaries constituting the two-dimensional stratum boundary data; a three-dimensional stratum boundary data correction step of correcting the three-dimensional stratum boundary data based on the two-dimensional stratum boundary data relating to the extracted identical boundary; A three-dimensional geological model correction method comprising:

10. A three-dimensional geological model correction program that causes a computer to execute each step of the three-dimensional geological model correction method of claim 9.

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