A method for constructing a three-dimensional spatial geological sketch of a group of underground caverns and application thereof

Abstract

The application provides a kind of underground cavern group three-dimensional space geological sketch map construction method and application, the method comprises the following steps: S1, underground cavern group building structure three-dimensional modeling;S2, field excavation face geological record and digitization drawing;S3, plane geological sketch map splicing and space array;S4, underground cavern group three-dimensional space geological sketch map construction;The application includes underground cavern group three-dimensional space geological sketch map based on the construction method respectively carries out underground cavern group three-dimensional visual geological information display, geological advanced prediction or surrounding rock excavation response prediction analysis and surrounding rock stability analysis.The application can fully reflect the three-dimensional space attribute of geological information, effectively improve the construction efficiency and precision of three-dimensional geological information BIM model and simulation calculation CAE model, and form electronic engineering archives, lay a solid foundation for geological advanced prediction, excavation response qualitative analysis and surrounding rock stability evaluation, and provide technical support for engineering design.

Description

Technical Field

[0001] This invention belongs to the field of engineering geology and underground engineering technology, and specifically relates to a method for constructing and applying a three-dimensional spatial geological sketch of an underground cavern group. Background Technology

[0002] In the field of underground engineering, current engineering geological logging is still at the stage of hand-drawn sketches and two-dimensional CAD digital sketches. These planar maps, which are drawn in sections based on the idea of ​​flat tunnel display, are not only numerous and scattered, but also lack key spatial information. They cannot intuitively, systematically and comprehensively describe geological conditions, and it is also difficult to conduct correlation analysis of geological information between caverns. Therefore, they are not suitable for the establishment of three-dimensional geological information systems for complex underground cavern groups, and they also seriously restrict the role of engineering geological analysis. Summary of the Invention

[0003] The first objective of this invention is to provide a method for constructing a three-dimensional spatial geological sketch of an underground cavern complex, addressing the shortcomings of existing technologies.

[0004] Therefore, the above-mentioned objective of the present invention is achieved through the following technical solution:

[0005] A method for constructing a three-dimensional spatial geological sketch of an underground cavern complex includes the following steps:

[0006] S1. Three-dimensional model of the underground cavern complex structure;

[0007] Given that large-scale underground projects include multiple interconnected caverns, a three-dimensional model of the cavern group is constructed using a computer-aided design (CAD) platform based on the architectural dimensions and coordinates of the cavern group.

[0008] S2. Geological logging and digital mapping of the excavation face;

[0009] Based on the excavation progress, geological logging will be carried out at the project site, including sketching elements such as lithological boundaries, geological structural traces, and types and extent of surrounding rock damage at each excavation face.

[0010] Based on the on-site geological logging maps, a digital planar geological sketch map was created using a computer-aided CAD platform;

[0011] S3. Stitching and spatial arraying of planar geological sketches;

[0012] Geological sketches of different excavation steps of each cavern are pieced together, rotated, and translated to form a spatial array around the cavern group according to a unified coordinate system.

[0013] S4. Construction of a three-dimensional spatial geological sketch of the underground cavern complex;

[0014] Geological sketch elements were projected onto the excavation face of each cavern using a projection operation.

[0015] The spatial sketch elements of each cavern are integrated according to a unified coordinate system to construct a highly integrated three-dimensional spatial sketch of the cavern complex. For example, based on actual geodetic coordinates.

[0016] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0017] As a preferred technical solution of the present invention: In particular, for some circular caverns, such as: arched dome or cylindrical well excavation face, the planar geological sketch is bent to form a curved surface.

[0018] Another objective of this invention is to provide an application of the method for constructing a three-dimensional spatial geological sketch of the underground cavern complex described above.

[0019] Therefore, the above-mentioned objective of the present invention is achieved through the following technical solution:

[0020] The first aspect is to provide the application of the method for constructing the three-dimensional spatial geological sketch map of the underground cavern group mentioned above in the three-dimensional visualization of geological information of the underground cavern group, including: merging sketch elements with different geological attributes into different layers to form a three-dimensional visualization geological information BIM model, and intuitively displaying various geological conditions and surrounding rock stability issues through the combination of multiple layers of spatial sketch elements.

[0021] The second aspect is to provide the application of the method for constructing the three-dimensional spatial geological sketch map of the underground cavern group mentioned above in geological advance prediction or surrounding rock excavation response prediction analysis, including: based on the lithological boundaries and geological structure distribution characteristics, the exposure range of structural surfaces can be inferred during the layered excavation process, which can carry out geological advance prediction and surrounding rock excavation response prediction analysis.

[0022] The third aspect is to provide the application of the method for constructing the three-dimensional spatial geological sketch map of the underground cavern group mentioned above in the analysis of surrounding rock stability. This includes: based on the exposed traces of structural surfaces in the three-dimensional spatial geological sketch map, accurately constructing spatial surfaces such as lithological boundaries and geological structures using a faceted approach, thereby quickly establishing a numerical calculation CAE model and carrying out surrounding rock stability analysis, providing technical support for excavation and support design; the CAE model includes finite element or discrete element numerical calculation models.

[0023] This invention provides a method and application for constructing a three-dimensional spatial geological sketch map of an underground cavern complex. It integrates the two-dimensional planar geological logging maps of each cavern into a unified coordinate system using projection, bending, and other techniques to form a three-dimensional spatial sketch map of the cavern complex. This fully reflects the three-dimensional spatial attributes of geological information, intuitively, systematically, and comprehensively describing geological conditions. It effectively improves the construction efficiency and accuracy of three-dimensional geological information BIM models and simulation calculation CAE models, and forms electronic engineering archives. This lays a solid foundation for geological advance prediction, qualitative analysis of excavation response, and surrounding rock stability evaluation, providing technical support for engineering design. Attached Figure Description

[0024] Figure 1 A flowchart illustrating the construction and application of three-dimensional spatial geological sketches of underground cavern groups;

[0025] Figure 2 Three-dimensional model of the underground cavern complex structure;

[0026] Figure 3 Geological logging and digital mapping of the excavation face;

[0027] Figure 4 A method for constructing three-dimensional spatial sketches;

[0028] Figure 5 A three-dimensional spatial sketch of the cave complex;

[0029] Figure 6 To establish geological structural surfaces based on three-dimensional spatial sketches;

[0030] Figure 7 This demonstrates the range of stress-induced failure in the surrounding rock of the cavern complex. Detailed Implementation

[0031] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 As shown, the method for constructing a three-dimensional spatial geological sketch of an underground cavern complex includes:

[0033] S1. Three-dimensional model of the underground cavern complex structure;

[0034] Large underground projects typically consist of multiple interconnected chambers, see [link to relevant documentation] Figure 2 The example underground cavern complex consists of underground powerhouse, main transformer tunnel, tailrace gate chamber, tailrace surge chamber, water diversion tunnel, busbar tunnel, tailrace tunnel, etc.

[0035] The three-dimensional model of the cave complex was created on a computer-aided design (CAD) platform according to its structural dimensions and coordinates. (See...) Figure 2 For example, Rhino software can be used to construct a geometric model of the cavern group.

[0036] S2. Geological logging and digital mapping of the excavation face;

[0037] Geological logging will be conducted at the construction site according to the excavation progress. (See attached document.) Figure 3 The sketches include elements such as the lithological boundaries, geological structural traces, and types and extent of surrounding rock damage at each excavation face.

[0038] Based on the on-site geological logging map, a digital planar geological sketch map was generated using a computer-aided CAD platform.

[0039] S3. Stitching and spatial arraying of planar geological sketches;

[0040] Geological sketches from different excavation stages of each cavern were pieced together, rotated, and translated to form a spatial array around the cavern complex according to a unified coordinate system. (See [reference]). Figure 4 .

[0041] S4. Construction of a three-dimensional spatial geological sketch of the underground cavern complex;

[0042] Geological sketch elements were projected onto the excavation face of each cavern using a projection operation.

[0043] For some arched or circular excavation faces, such as Figure 2 The arched ceiling of the corridor-shaped cave and the side walls of the cylindrical tail chamber shown need to be bent from the planar sketch to form a curved surface drawing;

[0044] The spatial sketch elements of each cavern are integrated according to a unified coordinate system (such as geodetic coordinates). See [link / reference]. Figure 5 Construct a highly integrated three-dimensional spatial sketch of the cavern complex.

[0045] Based on the method for constructing three-dimensional spatial geological sketches of underground cavern groups provided above, the following applications are possible:

[0046] 1) Merge sketch elements with different geological attributes into different layers to form a three-dimensional geological information BIM model. Through the combination of multiple layers, various geological conditions and surrounding rock stability issues can be intuitively displayed.

[0047] 2) Based on the lithological boundaries and geological structural distribution characteristics, the exposure range of structural planes can be inferred during the layered excavation process, which can be used to carry out geological advance prediction and surrounding rock excavation response prediction analysis.

[0048] 3) Based on the exposed traces of structural surfaces in the three-dimensional geological sketch, see... Figure 6 The surface is precisely constructed using a faceted design to represent lithological boundaries and geological structures.

[0049] Based on the geometric model of the underground cavern complex and newly established geological interfaces (lithological boundaries, geological structures, etc.), Griddle software can be used to quickly build FLAC3D, 3DEC, and finite element models, enabling efficient continuous and discontinuous numerical simulation analyses. See also Figure 7 The stress concentration zone in the numerical simulation matches the high-stress failure zone of the surrounding rock as visually displayed in the field geological logging. Therefore, the calculation results can provide effective technical support for predicting the failure range of the surrounding rock and formulating corresponding reinforcement support measures.

[0050] The above specific embodiments are used to explain and illustrate the present invention, and are only preferred embodiments of the present invention, not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A method for constructing a three-dimensional spatial geological sketch of an underground cavern complex, characterized in that: The method includes the following steps: S1. Three-dimensional model of the underground cavern complex structure; Given that large-scale underground projects include multiple interconnected caverns, a three-dimensional model of the cavern group is constructed using a computer-aided design (CAD) platform based on the architectural dimensions and coordinates of the cavern group. S2. Geological logging and digital mapping of the excavation face; Based on the excavation progress, geological logging will be carried out at the project site, including the lithological boundaries, geological structural traces, and types and extent of surrounding rock damage at each excavation face. Based on the on-site geological logging maps, a digital planar geological sketch map was created using a computer-aided CAD platform; S3. Stitching and spatial arraying of planar geological sketches; Geological sketches of different excavation steps of each cavern are pieced together, rotated, and translated to form a spatial array around the cavern group according to a unified coordinate system. S4. Construction of a three-dimensional spatial geological sketch of the underground cavern complex; For each cavern, the geological sketch elements were projected onto the excavation face of the cavern using a projection operation. For the arch of the corridor-shaped cavern and the sidewall of the cylindrical tail chamber, the planar geological sketch was bent to form a curved surface. The spatial sketch elements of each cave are integrated according to a unified coordinate system to construct a highly integrated three-dimensional spatial sketch of the cave complex.

2. The application of the method for constructing a three-dimensional spatial geological sketch of an underground cavern group according to claim 1 in the three-dimensional visualization of geological information of an underground cavern group, characterized in that: Sketch elements with different geological attributes are merged into different layers to form a three-dimensional visualized geological information BIM model. Through the combination of sketch elements in multiple layers, various geological conditions and surrounding rock stability issues can be intuitively displayed.

3. The application of the method for constructing a three-dimensional spatial geological sketch of an underground cavern group according to claim 1 in geological advance prediction or surrounding rock excavation response prediction analysis, characterized in that: Based on lithological boundaries and geological structural distribution characteristics, the exposure range of structural planes can be inferred during layered excavation, enabling geological advance prediction and surrounding rock excavation response prediction analysis.

4. The application of the method for constructing a three-dimensional spatial geological sketch of an underground cavern group according to claim 1 in the analysis of surrounding rock stability is characterized in that: Based on the exposed traces of structural surfaces in the three-dimensional geological sketch map, the lithological boundaries and geological structures are accurately constructed using a mosaic method. Then, a numerical calculation CAE model is quickly established, and the surrounding rock stability analysis is carried out to provide technical support for excavation and support design.

5. The application of the method for constructing a three-dimensional spatial geological sketch of an underground cavern group according to claim 4 in the analysis of surrounding rock stability, characterized in that: The CAE model includes finite element or discrete element numerical calculation models.

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