Three-dimensional geological modeling method based on GoCAD and Autodesk tool

Abstract

The invention relates to the technical field of 3D modeling, in particular to a three-dimensional geological modeling method based on GoCAD and Autodesk tools. The method comprises the following steps: exporting nodes and elevation points on a geological planar graph by using an Autodesk tool; creating a terrain surface through GoCAD software based on the exported nodes and elevation points; feature points of the geological interface are extracted by using an Autodesk tool; and creating a geological interface model by utilizing GoCAD software based on the feature points. According to the invention, the modeling efficiency and modeling quality of the geological interface model can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D modeling, in particular to a three-dimensional geological modeling method based on GoCAD and Autodesk tools. BACKGROUND

[0002] In the aspect of three-dimensional geological modeling, GoCAD is currently recognized as the most suitable software. Its advantage is that it uses DSI interpolation method to connect discrete points (the number of points can be less) into the most reasonable surface in trend, and the generated surface is smooth and beautiful, rarely with mutation or deformity. This is an advantage that other interpolation methods do not have. However, the shortcomings of GoCAD are also obvious, such as the interface is not friendly enough, the editing of the top view is difficult, the capture, positioning and editing of objects are not convenient enough, and the calculation function is weak, thereby leading to a relatively complex modeling process and insufficient modeling efficiency. SUMMARY

[0003] The present application provides a three-dimensional geological modeling method based on GoCAD and Autodesk tools. By organically combining GoCAD and Autodesk tools, the advantages of Autodesk tools are used to make up for the shortcomings in the modeling process of GoCAD tools, thereby solving the problem of complex modeling process and insufficient modeling efficiency existing in modeling only by GoCAD tools.

[0004] The present application is implemented by the following technical scheme: A three-dimensional geological modeling method based on GoCAD and Autodesk tools, comprising the following contents: Using Autodesk tools to export nodes and elevation points on the geological plan; Based on the exported nodes and elevation points, creating a terrain surface by GoCAD software; Using Autodesk tools to extract feature points of the geological interface; Based on the feature points, creating a geological interface model by GoCAD software.

[0005] The three-dimensional geological modeling method based on GoCAD and Autodesk tools provided by the present application combines GoCAD and Autodesk tools organically, uses Autodesk tools to extract point data, and uses GoCAD software to generate terrain surface and geological interface model, which can improve the quality of the geological interface model and the terrain surface. Compared with modeling by GoCAD software independently, using Autodesk tools to extract point data has higher efficiency, and Autodesk tools are mature in point data extraction, which is more efficient and simple compared with GoCAD software, and can improve the overall modeling efficiency.

[0006] In some optional embodiments, exporting the nodes and elevation points on the geological plan by using Autodesk tools comprises the following: Exporting the three-dimensional coordinates of the nodes and elevation points of the contour lines on the geological plan into a text file or an excel csv table file by using Civil 3D, wherein the three-dimensional coordinates of each node and elevation point occupies a row.

[0007] In some optional embodiments, creating the terrain surface by GoCAD software based on the exported nodes and elevation points comprises the following: Importing the exported nodes and elevation points into GoCAD software to establish the surface of the point set of all terrain points; Generating the terrain surface by the tear, constraint and interpolation functions in GoCAD software, wherein each tear is followed by multiple interpolations.

[0008] In some optional embodiments, extracting the feature points of the geological interface by using Autodesk tools comprises the following: Drawing several profile lines on the key positions on the terrain plan by using Civil 3D; Making a longitudinal section based on the profile lines and marking the geological points on the longitudinal section according to the profile lines; Drawing the geological interface line on the longitudinal section according to the geological features of the surface line and the geological interface; Extracting the geological interface line nodes as virtual drilling points based on the geological interface line; Generating three-dimensional point objects based on the surface exposure points and actual exploration points of the geological interface; Displaying the three-dimensional point objects and the virtual drilling points in a plan view and establishing a point group, wherein the edge points in the point group are connected in turn by using three-dimensional polyline commands to form a closed area.

[0009] In some optional embodiments, the key positions include gullies, ridges, terrain turning points, geological condition changing points and important engineering geological positions.

[0010] In some optional embodiments, the geological features of the surface line include the shape of the surface line, the positions of the exploration points and exposure points in the longitudinal section.

[0011] In some optional embodiments, the geological features of the geological interface include the depth range and the variation and extension rules.

[0012] In some optional embodiments, creating the geological interface model by GoCAD software based on the feature points comprises the following: Generating a curved surface by using Civil 3D based on the point group and outputting a dxf file; Import the dxf file into GoCAD software to generate a surface sketch; Mark several control points on the surface sketch, and optimize the surface sketch by using the beautification triangle net and interpolation function in GoCAD software to obtain a geological interface model.

[0013] In some optional embodiments, the control points include boundary points on the surface sketch, actual exploration points, valley-ridge representation points, and mutation representation points.

[0014] In some optional embodiments, based on the point grouping, generating a surface by using Civil 3D and outputting a dxf file includes the following steps: Creating contour lines based on the point grouping; Fitting the contour lines into a spline curve; Creating equidistant points on the spline curve; Generating a surface based on the point grouping, and adding the equidistant points to the surface.

[0015] Compared with the prior art, the present application has the following advantages and beneficial effects: The three-dimensional geological modeling method based on GoCAD and Autodesk tools provided in the present application combines GoCAD and Autodesk tools organically, extracts point data by using Autodesk tools, and generates a terrain surface and a geological interface model by using GoCAD software, which can improve the quality of the geological interface model and the terrain surface. Compared with modeling independently by using GoCAD software, the extraction of point data by using Autodesk tools has higher efficiency, and Autodesk tools are mature in point data extraction and have faster and simpler processing efficiency than GoCAD software, which can improve the overall modeling efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the example embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings: Figure 1 The flowchart of the three-dimensional geological modeling method based on GoCAD and Autodesk tools provided in the embodiments of the present application; Figure 2 The flowchart of the method for determining virtual drilling points provided in the embodiments of the present application; Figure 3A flowchart of creating a geological interface model based on feature points using GoCAD software is provided for the embodiments of the present application. Figure 4 A reference diagram of drawing a profile line result on a topography is provided for the embodiments of the present application. Figure 5 A reference diagram of a longitudinal section is provided for the embodiments of the present application. Figure 6 A reference diagram of a virtual drilling point is provided for the embodiments of the present application. Figure 7 A reference diagram of point grouping layout is provided for the embodiments of the present application. Figure 8 A reference diagram of expressing point grouping in GoCAD is provided for the embodiments of the present application. Figure 9 A reference diagram of a curved surface sketch generated in GoCAD is provided for the embodiments of the present application. Figure 10 A reference diagram of displaying contour lines when generating a curved surface sketch in Civil 3D is provided for the embodiments of the present application. Figure 11 A reference diagram of fitting contour lines and three-dimensional polyline after generating a curved surface sketch in Civil 3D is provided for the embodiments of the present application. Figure 12 A reference diagram of creating equidistant points of a spline curve in Civil 3D is provided for the embodiments of the present application. Figure 13 A reference diagram of adding equidistant points to a curved surface sketch in Civil 3D is provided for the embodiments of the present application. Figure 14 A reference diagram of a geological interface model after using GoCAD interpolation to beautify is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be given to the present application in combination with embodiments and drawings, and the illustrative embodiments of the present application and the description thereof are only used to explain the present application, and do not limit the present application.

[0018] Firstly, GoCAD and Autodesk tools are briefly introduced as follows: GoCAD (Geological Object Computer Aided Design) is a geological modeling software developed by Nancy University in France, which is mainly used for 3D visualization modeling in the field of geology. GOCAD has powerful 3D modeling, visualization and geological interpretation functions, and supports surface modeling, solid modeling, spatial geometric object design and spatial attribute distribution performance.

[0019] Autodesk tools include AutoCAD Civil 3D, AutoCAD Electrical, AutoCAD Map 3D, AutoCAD Mechanical, etc., among which AutoCAD Civil 3D is a comprehensive software package based on AutoCAD, which can be widely used in design, mapping and data management in various types of civil engineering projects.

[0020] As shown in Figures 1-3 The embodiments of the present application provide a three-dimensional geological modeling method based on GoCAD and Autodesk tools, which includes the following contents: S1, using Autodesk tools to export nodes and elevation points on the geological plan.

[0021] In the embodiments of the present application, the three-dimensional coordinates of all nodes and elevation points on the contour line in the geological plan are exported by Civil 3D, and the exported data is archived as a text document or an excel csv table file, wherein the three-dimensional coordinates (x, y, z) of each node and elevation point occupy a row.

[0022] S2, based on the exported nodes and elevation points, creating a terrain surface by GoCAD software.

[0023] In the embodiments of the present application, the text document or the excel csv table file in step S1 is imported into the GoCAD software to establish a point set surface about nodes and elevation points, and then the terrain surface is generated by the tearing, constraint and interpolation functions in the GoCAD software. In this process, each tearing can be interpolated multiple times, which will be conducive to forming a relatively regular, beautiful and high-precision terrain surface.

[0024] S3, using Autodesk tools to extract feature points of geological interface.

[0025] In the embodiment of the present application, the nodes in step S1 include exploration points and virtual drilling points, and the exploration points include actual drilling points, cave exploration points, pit exploration points, geophysical exploration points, and surface outcrop points, etc. In the area where the actual drilling points are relatively dense, no virtual drilling points need to be manually inserted, while in the area where the actual drilling points are sparse or even without actual drilling points, enough virtual drilling points need to be manually inserted according to the terrain, geological principles, the depth and variation law revealed by the nearby drilling, surface outcrop points, and other conditions.

[0026] Inserting virtual drilling points is a very important work. The efficiency is low, the randomness is large, and the geological law is not easy to reflect when the virtual drilling points are inserted by using the function of GoCAD software itself. The inserted virtual points are less, and too dependent on the tear and interpolation functions of GoCAD. Although a relatively beautiful and smooth surface can be made, it may deviate from the actual situation greatly and not fully integrate the judgment and understanding of the geological personnel. Therefore, the determination of the virtual drilling point position should be carried out by using Autodesk tools, which specifically includes the following contents: S31, as shown in Figure 4 , a plurality of profile lines are drawn on the key positions of the topographic plan by using Civil 3D.

[0027] In actual implementation, the profile line on the topographic plan should be drawn by using the turning polyline, and these key positions include gully, ridge, terrain turning position, geological condition change position, and important engineering geological position. When drawing the profile line, it should intersect with the contour line at a large angle, or coincide with the gully bottom line, ridge line, structure line, and geological condition boundary line.

[0028] S32, based on the profile line, a longitudinal section is made, and geological points on the longitudinal section are marked according to the profile line.

[0029] In actual implementation, as shown in Figure 5 and Figure 6 , the longitudinal section containing the topographic line is made based on the profile line, and the drilling on the profile line or the drilling near the profile line is projected on the corresponding position in the longitudinal section according to the stake number and elevation.

[0030] S33, according to the geological characteristics of the surface line and the geological interface, a geological boundary line is drawn on the longitudinal section.

[0031] In actual implementation, in the longitudinal section of step S32, a smooth curve is drawn by using the spline curve tool according to the shape of the surface line, the geological characteristics of each exploration point, outcrop point, etc. in the corresponding position in the longitudinal section, and according to the approximate depth range, variation and extension law, etc. of the geological interface, which is the geological boundary line of the geological interface in the longitudinal section.

[0032] S34, extracting geological boundary nodes as virtual drilling points based on the geological boundary.

[0033] In the embodiment, the smooth curve in step 33 is converted into a longitudinal section line, and the geological boundary nodes of each longitudinal section are extracted using the "extract points from route longitudinal section" command in Civil 3D, wherein the geological boundary nodes are generally equidistant points of the geological boundary, and a point object in Civil 3D is formed as a virtual drilling point.

[0034] S35, generating a three-dimensional point object based on the surface exposure points and the actual exploration points of the geological interface.

[0035] S36, displaying the three-dimensional point object and the virtual drilling point in a plan view and establishing a point group, wherein the edge points in the point group are connected in sequence to form a closed area using a three-dimensional polyline command, and the result is as shown in Figure 7

[0036] S4, creating a geological interface model based on the feature points using GoCAD software.

[0037] Specifically, the following contents are included: S41, generating a surface using Civil 3D based on the point group and outputting a dxf file.

[0038] S42, importing the dxf file into GoCAD software to generate a surface sketch.

[0039] After the surface is generated in Civil 3D, the three-dimensional polyline in step S36 can be used as the external boundary of the surface, and the surface with the external boundary is imported into GoCAD software as a surface sketch in a dxf format file; in other embodiments, as shown in Figures 8-9 the point group and the three-dimensional polyline can also be directly imported into GoCAD software, and then a surface sketch is generated in GoCAD software.

[0040] S43, marking a plurality of control points on the surface sketch, and optimizing the surface sketch using the beautification triangular net and interpolation function in GoCAD software to obtain a geological interface model.

[0041] In GoCAD software, the boundary points on the surface, the actual exploration points, the representative points of gullies and ridges, and the representative points of abrupt changes are set as control points, and the surface is beautified into a triangular net beautiful and smooth surface using the beautification triangular net and interpolation function in GoCAD, so as to obtain a final geological interface model, wherein the tearing function can also be used while using the beautification triangular net and interpolation function.

[0042] ​The three-dimensional geological modeling method based on GoCAD and Autodesk tools provided in the embodiment of the present application organically combines GoCAD and Autodesk tools, and uses Autodesk tools to extract virtual drilling points and actual exploration point data, which can ensure the accuracy of the point positions and the extraction efficiency, and uses GoCAD software to realize the generation of terrain surface and geological interface models, which can improve the quality of geological interface models and terrain surfaces. Compared with the independent use of GoCAD software for modeling, the use of Autodesk tools for point data extraction has higher efficiency, and Autodesk tools have mature technology in point data extraction, and are faster and simpler than GoCAD software in processing efficiency, which can improve the overall modeling efficiency.

[0043] In the above embodiment, when using the method of combining Civil 3D and GoCAD to create a geological interface surface, multiple longitudinal sections must be drawn, and all endpoints of the geological interface lines of each longitudinal section must be extracted as virtual drilling points required for creating the surface. If the project site is large and the drilling density is very uneven, if there are too many longitudinal sections, it will take a lot of time and reduce the efficiency of 3D modeling.

[0044] Therefore, in some optional embodiments, in areas where there are fewer or no actual drilling points, Civil 3D is used to only make longitudinal sections of key areas, mutation areas, and ends of modeling areas, thereby reducing the number of longitudinal sections and improving efficiency.

[0045] In the above step S41, if Figure 10 As shown in the figure, when using Civil 3D to generate a surface, the contour lines of the surface are displayed through the function of generating surface contour lines in Civil 3D, and then the contour lines are extracted to generate polylines.

[0046] Convert the generated polyline into a fitted point spline curve. Figure 11 shown.

[0047] Use the Interval Point command in Civil 3D to create interval points on the fitted point spline. The interval distance should be reasonably determined based on the approximate side length of the required triangulated network. The result is as follows: Figure 12 shown.

[0048] Use the "Add Geometry Points to Surface" function in Civil 3D to add all equally spaced points to the surface. The result is as follows: Figure 13 shown.

[0049] The surface with the equidistant points is imported into GoCAD in dxf format, and after setting the necessary control points, the surface is smoothed by using the beautifying triangle net and interpolation functions of GoCAD, thus obtaining the required geological interface model, as shown in Figure 14

[0050] The above description merely illustrates the principles of the application. Although the application has been described in conjunction with specific embodiments thereof, it is evident that other alternatives and modifications will be apparent to those skilled in the art in view of the description. Therefore, the description is intended for purposes of illustration only and not for purposes of limiting the scope of the application. It is therefore intended to cover in the appended claims all such alternatives and equivalents as fall within the true spirit and scope of the application. Numerous specific details have been set forth in this description in order to provide a thorough understanding of the application. The application may, however, be practiced without some or all of these specifics. In other instances, well known methods, procedures and components have not been described in detail so as not to unnecessarily obscure aspects of the application. Still, some specific details have been set forth in order to provide a thorough understanding of the application. The description and drawings are merely illustrative of the application and should not be taken as limiting the scope of the application. Unless otherwise specified, any and all embodiments of at least one aspect of the present application can be similarly combined. In addition, certain terms have been used throughout this patent to refer to certain geographic features. As one skilled in the art will appreciate, the terms used are for the purpose of describing and are not intended to limit the scope of the application, as the terms are intended to encompass all suitable equivalents. Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.​

Claims

1. A three-dimensional geological modeling method based on GoCAD and Autodesk tools, characterized in that: Includes the following: Use Autodesk tools to export nodes and elevation points on geological plan; Create terrain surfaces using GoCAD software based on the exported nodes and elevation points; Use Autodesk tools to extract characteristic points of geological interfaces; The geological interface model was created using GoCAD software based on the characteristic points.

2. The three-dimensional geological modeling method based on GoCAD and Autodesk tools according to claim 1, characterized in that: The nodes and elevation points on the geological plan exported using Autodesk tools include the following: Use Civil 3D to export the three-dimensional coordinates of the nodes and elevation points of the contour lines on the geological plan as a text file or an Excel CSV table file, where the three-dimensional coordinates of each node and elevation point occupy a separate line.

3. The three-dimensional geological modeling method based on GoCAD and Autodesk tools according to claim 1, characterized in that: Creating a terrain surface using GoCAD software based on the exported nodes and elevation points includes the following: Import the exported nodes and elevation points into GoCAD software to create a point-concentrated surface of all terrain points; The terrain surface is generated by the splitting, constraint and interpolation functions in the GoCAD software, wherein multiple interpolations are performed each time the terrain is split.

4. The three-dimensional geological modeling method based on GoCAD and Autodesk tools according to claim 1, characterized in that: The extraction of characteristic points of geological interfaces using Autodesk tools includes the following: Use Civil 3D to draw several section lines at key locations on the terrain plan; making a longitudinal section based on the section line and marking geological points on the longitudinal section according to the section line; Drawing geological boundaries on the longitudinal section based on the geological characteristics of the surface lines and geological interfaces; Extracting geological boundary nodes based on the geological boundary as virtual drilling points; Generate 3D point objects based on surface outcrops and actual exploration points of geological interfaces; The three-dimensional point objects and the virtual drilling points are displayed in a planar top view and a point group is established, wherein edge points in the point group are sequentially connected using a three-dimensional polyline command to form a closed area.

5. The three-dimensional geological modeling method based on GoCAD and Autodesk tools according to claim 4, characterized in that: The key locations include ravines, ridges, terrain bends, locations where geological conditions change, and important engineering geological locations.

6. The three-dimensional geological modeling method based on GoCAD and Autodesk tools according to claim 4, characterized in that: The geological characteristics of the surface line include the shape of the surface line, the positions of the exploration points and the outcropping points in the longitudinal section.

7. The three-dimensional geological modeling method based on GoCAD and Autodesk tools according to claim 4, characterized in that: The geological characteristics of the geological interface include depth range and change and extension laws.

8. The three-dimensional geological modeling method based on GoCAD and Autodesk tools according to claim 4, characterized in that: Creating a geological interface model using GoCAD software based on feature points includes the following: Based on the point grouping, generate a surface using Civil 3D and output a dxf file; Importing the dxf file into GoCAD software to generate a surface prototype; Several control points are marked on the surface prototype, and the surface prototype is optimized using the beautification triangulation and interpolation functions in the GoCAD software to obtain a geological interface model.

9. The three-dimensional geological modeling method based on GoCAD and Autodesk tools according to claim 8, characterized in that: The control points include boundary points on the surface prototype, actual exploration points, ravine and ridge characterization points, and mutation characterization points.

10. The three-dimensional geological modeling method based on GoCAD and Autodesk tools according to claim 8, characterized in that: Based on the point grouping, use Civil 3D to generate a surface and output a dxf file containing the following: creating contour lines based on the point groups; Fit contour lines to spline curves; Creating equally spaced points on the spline curve; A curved surface is generated based on the point grouping, and the equally spaced points are added to the curved surface.

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