Parameterized modeling and grid model construction method for underground powerhouse cavern group

Abstract

The invention provides a parametric modeling and grid model construction method for an underground powerhouse cavern group. The method comprises the following steps: determining a geometric origin position and three-axis directions of modeling; determining geometric parameters of a main structure in the underground powerhouse; geometric parameters of a connecting hole connected with the main structure; extracting section parameter value schematic diagrams of the main structures and the connecting holes; according to the section parameter value schematic diagram, through a battery pack of a Grasshopper plug-in of Rhino software, according to a point-line-plane construction logic, constructing a factory building main structure framework and a connection hole framework; and combining the main structure frame and the connecting hole frame of the plant according to the connection relationship, and obtaining an underground plant model based on the geometric origin position. The repeatability and uncertainty of manual operation are avoided, and the modeling speed is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground powerhouse modeling, and in particular to a method for parameterized modeling and grid model construction of an underground powerhouse cavern group. Background Art

[0002] In today's era of rapid development of infrastructure construction, large-scale underground cavern complex projects continue to emerge, such as underground powerhouses of hydropower stations, transportation tunnels, underground mining and other fields. The construction of these large underground cavern complexes is of vital importance in promoting economic development, meeting energy needs and improving traffic conditions. However, stability analysis and design of underground powerhouses face many challenges, among which establishing an accurate and reliable computational grid model is one of the key links. Traditional underground powerhouse modeling methods have obvious limitations.

[0003] On the one hand, traditional modeling methods are inefficient. They usually require a lot of manual work, and the process from collecting data to gradually building models is cumbersome and time-consuming. For underground powerhouses, which have complex structures and large scales, traditional methods often require a lot of time and manpower costs. For example, when manually drawing models, not only are errors prone to occur, but it is also difficult to accurately grasp the complex shapes and relationships of the caverns, resulting in a long modeling cycle.

[0004] On the other hand, as the project progresses and the actual situation changes, the parameters of the underground powerhouse may be adjusted. When faced with this situation, traditional modeling methods are difficult to modify the model, often requiring a lot of work to be done again, and lack flexibility and adaptability.

[0005] In summary, the traditional underground powerhouse modeling method is difficult to meet the increasingly complex engineering needs. Therefore, there is an urgent need to develop an automated, efficient, accurate and well-adaptable parametric modeling method to solve these problems. Summary of the invention

[0006] The present invention proposes a parametric modeling and grid model construction method for an underground powerhouse cavern group, so as to solve the technical problems that the existing underground powerhouse modeling method is cumbersome, time-consuming and lacks flexibility and adaptability.

[0007] In order to solve the above technical problems, the present invention provides a method for parameterized modeling and grid model construction of an underground powerhouse cavern group, comprising the following steps:

[0008] Step S11: determine the geometric origin position and three-axis directions of the modeling; determine the geometric parameters of the main structure in the underground powerhouse; the geometric parameters of the connecting hole connected to the main structure; extract the schematic diagram of the cross-sectional parameter values ​​of the main structure and the connecting hole;

[0009] The main structures include: main powerhouse, machine nest, main transformer tunnel and tail gate tunnel;

[0010] The connecting tunnel includes: main transformer tunnel, busbar tunnel, tailwater pipe and tailwater pipe gate;

[0011] Step S12: According to the cross-section parameter value diagram, the main structural frame and the connection hole frame of the plant are constructed according to the point-line-surface construction logic through the battery pack of the Grasshopper plug-in of the Rhino software;

[0012] Step S13: Combine the main structural frame of the plant and the connection hole frame according to the connection relationship, and obtain the underground plant model based on the position of the geometric origin.

[0013] Preferably, in step S11, the geometric origin is located at the top wall of the main plant arch, the positive direction of the X-axis is the direction from the main plant to the tail gate tunnel, the Y-axis is the main plant axis, the positive direction is the direction from the busbar tunnel to the main transformer tunnel, and the Z-axis is the vertical direction, with the top being the positive direction.

[0014] Preferably, the geometric parameters of the main structure in step S11 are as follows:

[0015] The geometric parameters of the main powerhouse include: main powerhouse arch coordinates, main powerhouse arch half span, main powerhouse arch height, rock anchor beam width, rock anchor beam upper outer length, rock anchor beam lower outer length, rock anchor beam inward width, rock anchor beam inner length, excavation step, and main powerhouse length;

[0016] The geometric parameters of the machine pit include: the distance between the machine pit and the end wall of the main powerhouse, the length of the machine pit, the excavation step, the inward distance of the machine pit, the machine pit step, the machine pit floor, the width of each machine pit and the interval between the machine pits;

[0017] The geometric parameters of the main transformer tunnel include: the main transformer tunnel arch top coordinates, the main transformer tunnel half span, the main transformer tunnel arch height, the excavation step, the main transformer tunnel bottom non-inward range, the main transformer tunnel bottom side wall inward distance and the main transformer tunnel length;

[0018] The geometric parameters of the tailgate tunnel include: tailgate tunnel arch top coordinates, tailgate tunnel arch top half span, tailgate tunnel arch height, rock anchor beam width, rock anchor beam upper outer length, rock anchor beam lower outer length, rock anchor beam inward width, rock anchor beam inner length, excavation step and tailgate tunnel length.

[0019] Preferably, the geometric parameters of the connecting hole in step S11 are as follows:

[0020] The geometric parameters of the main transformer tunnel include: the main transformer tunnel arch top coordinates, the main transformer tunnel half span, the main transformer tunnel arch height and the main transformer tunnel side wall height;

[0021] The geometric parameters of busbar tunnels include: the vault coordinates of each busbar tunnel section, the half span of each busbar tunnel section, the arch height of each busbar tunnel section, the side wall height of each busbar tunnel section, the length of each busbar tunnel section, the spacing between busbar tunnels and the number of busbar tunnels;

[0022] The geometric parameters of the tailwater pipe include: the coordinates of the tailwater pipe axis, the radius of the tailwater pipe, the height difference between the front and rear sections of the tailwater pipe, the length of each tailwater pipe, the spacing between the tailwater pipes and the length of the tailwater pipe;

[0023] The geometric parameters of the tailwater gate include: the distance between the gate and the end wall of the tailwater tunnel, the height of the tailwater gate, and the height and width of the tailwater pipe and gate.

[0024] Preferably, the method for constructing the main structural framework in step S12 includes:

[0025] The main building arch coordinate point is selected as the main building section feature point, and other feature points of the main building section are obtained through mathematical calculations;

[0026] The connection point between the machine nest and the main workshop is selected as the characteristic point of the machine nest section, and other characteristic points of the machine nest section are obtained through mathematical calculations;

[0027] The coordinate point of the main transformer tunnel vault is selected as the characteristic point of the main transformer tunnel section, and other characteristic points of the main transformer tunnel section are obtained through mathematical operations;

[0028] The arch top coordinate point of the tailgate is selected as the characteristic point of the tailgate section, and other characteristic points of the tailgate section are obtained through mathematical operations;

[0029] The characteristic points corresponding to the cross section of each main structure are formed into lines, inlaid, and extruded to obtain a model of each main structure.

[0030] Preferably, the method for constructing the connection hole framework in step S12 includes:

[0031] The coordinate point of the main transformer tunnel vault is selected as the characteristic point of the main transformer tunnel cross section, and other characteristic points of the main transformer tunnel cross section are obtained through mathematical operation;

[0032] The coordinate points of the busbar tunnel vault are selected as the characteristic points of the busbar tunnel section, and other characteristic points of the busbar tunnel section are obtained through mathematical operations;

[0033] The coordinate point of the tailwater pipe axis is selected as the characteristic point of the tailwater pipe cross section, and other characteristic points of the tailwater pipe cross section are obtained through mathematical operations;

[0034] The connection point between the tailwater gate and the tailwater tunnel is selected as the tailwater gate section, and other characteristic points of the tailwater gate section are obtained through mathematical calculations;

[0035] The characteristic points corresponding to the cross section of each connecting hole are formed into lines, inlaid with surfaces, and extruded to obtain a model of each connecting hole.

[0036] The present invention also provides a method for constructing a grid model of an underground powerhouse cavern group, which is implemented based on the above-mentioned parameterized modeling method of the underground powerhouse cavern group and includes the following steps:

[0037] S21, using the grid command provided by the Rhino software to grid the combined underground powerhouse model obtained in step S13;

[0038] S22. With the help of the Griddle plug-in, use the GI function to set the minimum tolerance and connection method to connect the grids;

[0039] S23. Use the GS function to set the mesh type and the maximum and minimum mesh edge length parameters, and set the names of each structure to encrypt the mesh;

[0040] S24. Use the GV function to set the output grid type and format, select the range of the grid to be output, and then output the grid file to obtain the constructed grid model of the underground factory building.

[0041] The beneficial effects of the present invention include at least:

[0042] 1) Parametric processing and automated construction logic greatly reduce the time required for modeling. Traditional modeling methods usually require manual construction of each part one by one, which is cumbersome and time-consuming. The present invention performs parametric processing on the three views of the underground plant model, converting complex geometric shapes into quantifiable parameters, making the modeling process more efficient. Using the Grasshopper plug-in in the Rhino software, the main structural framework and connection holes of the plant are automatically constructed according to the construction logic of points, lines and surfaces. This automated construction method avoids the repetitiveness and uncertainty of manual operations and greatly improves the modeling speed.

[0043] 2) Modeling is based on accurate CAD drawings provided by the design, ensuring that the original data source of the model is reliable. From the beginning, the overall structural dimensions and geometric shape of the plant model are deeply analyzed, and the location of the modeling geometric origin is determined, providing an accurate reference framework for subsequent construction. The parametric processing process can accurately control each part of the model to ensure the accuracy of the geometric parameters. The extracted schematic diagram of the cross-section parameters of the main structure of the plant and the connection hole provides specific data guidance for the construction process, so that the size and shape of the model can be constructed strictly in accordance with the design requirements.

[0044] 3) Parametric modeling makes it easier to modify and adjust the model. If the design requirements change, you only need to adjust the corresponding parameter values ​​to quickly update the model. For example, if you need to change the size of the main structure of the plant, you only need to modify the relevant parameters, and the Grasshopper plug-in will automatically rebuild the structural framework according to the new parameters. For different design schemes, you can quickly generate multiple versions of the model by adjusting the parameters for comparison and optimization. This flexibility greatly improves design efficiency and can better meet the needs of different projects.

[0045] 4) The use of unified modeling methods and parameters ensures consistency between different parts. Whether it is the main structure of the powerhouse or the connection hole, they all follow the same point-line-surface construction logic and use the same parameterization processing method, so that the entire underground powerhouse model has a high degree of coordination and consistency between various parts. This consistency is particularly important for the computational grid model of the underground powerhouse, because it ensures that in subsequent analysis and calculations, the various parts of the model can match each other and provide accurate and reliable results.

[0046] 5) The completed underground powerhouse model has a clear structure and accurate geometric shape, which provides a good foundation for the subsequent use of griddle for meshing. It provides a reliable basis for the design and analysis of underground powerhouses and improves the safety and reliability of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic diagram of the method flow chart of Example 1 of the present invention;

[0048] Figure 2 It is a three-dimensional diagram of the underground plant model provided in Example 1 of the present invention;

[0049] Figure 3 It is a three-view drawing of the underground plant model provided in Example 1 of the present invention;

[0050] Figure 4-1 This is a schematic diagram of parameter values ​​of the main plant in Example 1 of the present invention;

[0051] Figure 4-2 Schematic diagram of nest parameter values ​​of embodiment 1 of the present invention;

[0052] Figure 4-3 This is a schematic diagram of the main transformer tunnel parameter values ​​of Example 1 of the present invention;

[0053] Figure 4-4 Schematic diagram of the tailgate parameter values ​​of embodiment 1 of the present invention;

[0054] FIG4( a ) is a battery pack constructed in the main plant provided in Example 1 of the present invention;

[0055] FIG4( b ) is a battery pack constructed by a machine nest provided in Example 1 of the present invention;

[0056] FIG4( c ) is a battery pack constructed by the main transformer hole provided in Example 1 of the present invention;

[0057] FIG4( d ) is a battery pack constructed by the tailgate provided in Example 1 of the present invention;

[0058] Figure 5-1 This is a schematic diagram of the parameters of the main transformer tunnel traffic tunnel in Example 1 of the present invention;

[0059] Figure 5-2 Schematic diagram of busbar hole parameter values ​​in embodiment 1 of the present invention;

[0060] Figure 5-3 Schematic diagram of the parameters of the tailwater pipe and tailwater pipe gate according to Embodiment 1 of the present invention;

[0061] FIG5( a ) is a battery pack constructed in the main transformer tunnel and traffic tunnel provided in Example 1 of the present invention;

[0062] FIG5( b ) is a battery pack constructed with a busbar hole provided in Example 1 of the present invention;

[0063] FIG5( c ) is a battery pack constructed by a tailwater pipe and a tailwater pipe gate provided in Example 1 of the present invention;

[0064] Figure 6 This is a main structural framework diagram of a factory building provided in Example 1 of the present invention;

[0065] Figure 7 This is a structural framework diagram of a plant connection hole provided in Example 1 of the present invention;

[0066] Figure 8 It is a combined diagram of the main structure and connection holes of the plant provided in Example 1 of the present invention;

[0067] Fig. 9 is a schematic diagram of the flow of the grid modeling method provided in Example 2 of the present invention;

[0068] In the figure: 101-main powerhouse; 102-machine nest; 103-tailwater pipe; 104-tailwater pipe gate; 201-main transformer tunnel; 301-tailwater gate tunnel; 401-main transformer tunnel traffic tunnel; 501-busbar tunnel. DETAILED DESCRIPTION

[0069] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0070] Example 1

[0071] like Figure 1 As shown, an embodiment of the present invention provides a parameterized modeling method for an underground powerhouse cavern group, comprising the following steps:

[0072] Step S11: Determine the geometric origin position and three-axis direction of the modeling; determine the geometric parameters of the main structure in the underground powerhouse; the geometric parameters of the connecting hole connected to the main structure; extract the schematic diagram of the cross-sectional parameters of the main structure and the connecting hole

[0073] The main structures include: main powerhouse, machine nest, main transformer tunnel and tail gate tunnel;

[0074] The connecting tunnels include: main transformer tunnel, busbar tunnel, tailwater pipe and tailwater pipe gate.

[0075] Specifically, the embodiment of the present invention takes the modeling of the underground powerhouse of XX pumped storage hydropower station as an example to illustrate the modeling, and its model diagram is as follows Figure 2 shown.

[0076] According to the CAD drawings provided by the designer, determine the required underground plant model, analyze the size and geometry of the overall structure in the plant model, determine the location of the modeling geometry origin (at the top wall of the main plant arch), and extract the three views of the plant. The effect is as follows: Figure 3 shown.

[0077] In the embodiment of the present invention, after clarifying the overall structure of the underground plant, it is determined that the modeling geometric origin is located at the top wall of the arch of the main plant 101, the positive direction of the X-axis is the direction from the main plant 101 to the tail gate tunnel 301, the Y-axis is the axis of the main plant 101, the positive direction is the direction from the busbar tunnel 501 to the main transformer tunnel 401, the Z-axis is the vertical direction, and the top is taken as the positive direction, and the three views of the plant are extracted to ensure the accuracy and completeness of the views.

[0078] The three views of the underground powerhouse model are processed parametrically to determine the geometric parameters of the main structures in the underground powerhouse model and extract the schematic diagram of the cross-sectional parameters of the main structures of the powerhouse. The effect is as follows: Figure 4-1 to Figure 4-4 shown.

[0079] The geometric parameters of the main structures in the underground powerhouse model in this example are shown in Table 1.

[0080] The geometric parameters of the main powerhouse 101 include the main powerhouse arch coordinates, the main powerhouse arch half span, the main powerhouse arch height, the rock anchor beam width, the upper outer length of the rock anchor beam, the lower outer length of the rock anchor beam, the inward width of the rock anchor beam, the inner length of the rock anchor beam, excavation 1-7, and the main powerhouse length.

[0081] Table 1: Geometric parameters of main plant 101 (m)

[0082]

[0083] The geometric parameters of the machine nest 102 include the distance between the machine nest 1 and the end wall of the main factory building, the length of the machine nest, excavation 1-3, the inward distance of the machine nest, the machine nest step, the machine nest floor 1, the width of the machine nest 1, the interval 1, the width of the machine nest 2, the interval 2, and the width of the machine nest 3, as shown in Table 2.

[0084] Table: Geometric parameters of nest 102 (m)

[0085]

[0086] The geometric parameters of the main transformer tunnel 201 include the main transformer tunnel arch top coordinates, the main transformer tunnel half span, the main transformer tunnel arch height, excavation 1-4, the main transformer tunnel bottom non-retracted range, the main transformer tunnel bottom side wall retracted distance, and the main transformer tunnel length, as shown in Table 3.

[0087] Table 3: Geometric parameters of main transformer tunnel 201 (m)

[0088]

[0089] The geometric parameters of the tailgate tunnel 301 include the coordinates of the tailgate tunnel arch, the half span of the tailgate tunnel arch, the arch height of the tailgate tunnel, the width of the rock anchor beam, the upper outer length of the rock anchor beam, the lower outer length of the rock anchor beam, the inward width of the rock anchor beam, the inner length of the rock anchor beam, excavation 1-4, and the length of the tailgate tunnel, as shown in Table 4.

[0090] Table 4: Geometric parameters of tailgate 301 (m)

[0091]

[0092] References Figure 5-1 to Figure 5-3 As shown, the geometric parameters of the connecting hole structure in this example are as follows.

[0093] The geometric parameters of the main transformer tunnel 401 include the main transformer tunnel arch top coordinates, the main transformer tunnel half span, the main transformer tunnel arch height, and the main transformer tunnel side wall height, as shown in Table 5.

[0094] Table 5: Geometric parameters of main transformer tunnel 401 (m)

[0095]

[0096] The geometric parameters of busway 501 include busway section 1 arch coordinates, busway section 1 half span, busway section 1 arch height, busway section 1 side wall height, busway section 1 length, busway section 2 arch coordinates, busway section 2 half span, busway section 2 arch height, busway section 2 side wall height, busway section 2 length, busway spacing, and busway quantity, as shown in Table 6.

[0097] Table 6: Busbar hole 501 geometric parameters (m)

[0098]

[0099] The geometric parameters of the tailwater pipe 103 include the coordinates of the tailwater pipe axis, the tailwater pipe radius, the height difference between the front and rear sections of the tailwater pipe, i.e., the height difference between the tailwater pipe 1-2, the length of the tailwater pipe 1-3, the distance between the tailwater pipes, and the number of tailwater pipes; the geometric parameters of the tailwater pipe gate 104 include the distance between the gate and the end wall of the tailwater tunnel, the height of the tailwater pipe gate, and the height width of the gate, as shown in Table 7.

[0100] Table 7: Geometric parameters of tailwater tube 103 and tailwater tube gate 104 (m)

[0101]

[0102] Step S12: Based on the cross-section parameter value diagram, the battery group of the Grasshopper plug-in of the Rhino software is used to construct the main structural frame and the connection hole frame of the factory building according to the point-line-surface construction logic. Figure 4(a) to Figure 4(d) As shown. The battery packs with various connection holes are as follows Figure 5(a) to Figure 5(c) As shown. Construct the main structural frame of the factory building. Figure 6 As shown. The main connection hole structural frame of the plant is constructed, and its effect is referenced Figure 7 .

[0103] Specifically, the model framework construction for the main structures includes:

[0104] 1) Construction of the main plant: construct the cross-sectional feature points that control the main plant 101, specifically select the coordinate points of the main plant vault, and obtain other feature points of the cross section of the main plant through mathematical operations; connect the feature points of the cross section of the main plant into lines, embed the surface, and extrude to obtain the main plant.

[0105] 2) Construction of the machine nest 102: construct the cross-sectional feature points that control the machine nest 102, specifically select the connection points between the machine nest and the main plant, and obtain other feature points of the cross section of the machine nest through mathematical operations; connect the feature points of the cross section of the machine nest into lines, embed the surface, and extrude to obtain the machine nest.

[0106] 3) Construction of the main transformer hole 201: construct the cross-sectional feature points of the main transformer hole 201, specifically select the main transformer hole arch top coordinate points, and obtain other feature points of the main transformer hole cross section through mathematical operations; connect the feature points of the main transformer hole cross section into lines, embed the surface, and extrude to obtain the main transformer hole.

[0107] 4) Construction of the tailgate 301: construct the cross-sectional feature points of the tailgate 301, specifically select the arch top coordinate points of the tailgate, and obtain other feature points of the cross section of the tailgate through mathematical operations; connect the feature points of the cross section of the tailgate into lines, embed the surface, and extrude to obtain the tailgate.

[0108] The model framework for connecting holes includes:

[0109] 1) Construction of the busbar hole 501: constructing the cross-sectional feature points of the busbar hole 501, specifically selecting the busbar hole vault coordinate points, and obtaining other feature points of the busbar hole cross section through mathematical operations; connecting the feature points of the busbar hole cross section into lines, embedding the surface, and extruding to obtain the busbar hole.

[0110] 2) Construction of the tailwater pipe 103: construct the cross-sectional feature points of the tailwater pipe 103, specifically select the coordinate points of the tailwater pipe axis, and obtain other feature points of the tailwater pipe cross section through mathematical operations; connect the feature points of the tailwater pipe cross section into lines, embed the surface, and extrude to obtain the tailwater pipe.

[0111] 3) Construction of the tailwater gate 104: construct the cross-sectional feature points for controlling the tailwater gate 104, specifically select the connection points between the tailwater gate and the tailgate hole, and obtain other feature points of the tailwater gate cross section through mathematical operations; connect the feature points of the tailwater gate cross section into lines, embed the surface, and extrude to obtain the tailwater gate.

[0112] Step S13: Combine the main structural frame of the plant and the connection hole frame according to the connection relationship, and obtain the underground plant model based on the geometric origin position. Figure 8 shown.

[0113] Example 2

[0114] The present invention also provides a method for constructing a grid model of an underground powerhouse cavern group, such as Fig. 9 As shown, specifically, use the grid command that comes with Rhino to divide the assembled underground plant model into grids, and use the default grid division accuracy; with the help of the Griddle plug-in, use the GI function to set the minimum tolerance and connection method to connect the grids; use the GS function to set the grid type, maximum and minimum grid edge length parameters, and set the plant name at the same time to encrypt the grid; use the GV function to set the output grid type and format, select the range of the grid to be output, and then output the grid file, that is, establish a large underground cavern group calculation grid model.

[0115] Through the above-mentioned parametric modeling method, the entire underground powerhouse model has a high degree of coordination and consistency among various parts, thus ensuring the accuracy and reliability of gridding, and providing a good foundation for the subsequent use of griddle for gridding.

[0116] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. Only the preferred embodiments of the present invention are expressed. The description is more specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. As long as there is no contradiction in the combination of these technical features, they should be considered as the scope recorded in this specification.

[0117] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A parametric modeling method for underground powerhouse caverns, characterized in that: The following steps are involved: Step S11: Determine the geometric origin position and three-axis directions of modeling; Determine the geometric parameters of the main structures in the underground powerhouse; The geometric parameters of the connection hole connected to the main structure; extract the schematic diagram of the cross-sectional parameter values ​​of the main structure and the connection hole; The main structures include: main powerhouse, machine nest, main transformer tunnel and tail gate tunnel; The connecting tunnel includes: main transformer tunnel, busbar tunnel, tailwater pipe and tailwater pipe gate; Step S12: According to the cross-section parameter value diagram, the main structural frame and the connection hole frame of the plant are constructed according to the point-line-surface construction logic through the battery pack of the Grasshopper plug-in of the Rhino software; Step S13: Combine the main structural frame of the plant and the connection hole frame according to the connection relationship, and obtain the underground plant model based on the position of the geometric origin.

2. The parametric modeling method of an underground powerhouse cavern group according to claim 1 is characterized in that: In step S11, the geometric origin is located at the top wall of the main powerhouse arch, the positive direction of the X-axis is from the main powerhouse to the tail gate tunnel, the Y-axis is the main powerhouse axis, the positive direction is from the bus tunnel to the main transformer tunnel, and the Z-axis is the vertical direction, with the top being the positive direction.

3. The parametric modeling method of an underground powerhouse cavern group according to claim 1 is characterized in that: The geometric parameters of the main structure in step S11 are as follows; The geometric parameters of the main powerhouse include: main powerhouse arch coordinates, main powerhouse arch half span, main powerhouse arch height, rock anchor beam width, rock anchor beam upper outer length, rock anchor beam lower outer length, rock anchor beam inward width, rock anchor beam inner length, excavation step, and main powerhouse length; The geometric parameters of the machine pit include: the distance between the machine pit and the end wall of the main powerhouse, the length of the machine pit, the excavation step, the inward distance of the machine pit, the machine pit step, the machine pit floor, the width of each machine pit and the interval between the machine pits; The geometric parameters of the main transformer tunnel include: the main transformer tunnel arch top coordinates, the main transformer tunnel half span, the main transformer tunnel arch height, the excavation step, the main transformer tunnel bottom non-inward range, the main transformer tunnel bottom side wall inward distance and the main transformer tunnel length; The geometric parameters of the tailgate tunnel include: tailgate tunnel arch top coordinates, tailgate tunnel arch top half span, tailgate tunnel arch height, rock anchor beam width, rock anchor beam upper outer length, rock anchor beam lower outer length, rock anchor beam inward width, rock anchor beam inner length, excavation step and tailgate tunnel length.

4. The parametric modeling method of an underground powerhouse cavern group according to claim 1 is characterized in that: The geometric parameters of the connection hole in step S11 are as follows; The geometric parameters of the main transformer tunnel include: the main transformer tunnel arch top coordinates, the main transformer tunnel half span, the main transformer tunnel arch height and the main transformer tunnel side wall height; The geometric parameters of busbar tunnels include: the vault coordinates of each busbar tunnel section, the half span of each busbar tunnel section, the arch height of each busbar tunnel section, the side wall height of each busbar tunnel section, the length of each busbar tunnel section, the spacing between busbar tunnels and the number of busbar tunnels; The geometric parameters of the tailwater pipe include: the coordinates of the tailwater pipe axis, the radius of the tailwater pipe, the height difference between the front and rear sections of the tailwater pipe, the length of each tailwater pipe, the spacing between the tailwater pipes and the length of the tailwater pipe; The geometric parameters of the tailwater gate include: the distance between the gate and the end wall of the tailwater tunnel, the height of the tailwater gate, and the height and width of the tailwater pipe and gate.

5. The parametric modeling method of an underground powerhouse cavern group according to claim 1 is characterized in that: The method for constructing the main structural framework in step S12 includes: The main building vault coordinate point is selected as the main building cross-section feature point, and other feature points of the main building cross-section are obtained through mathematical operations; The connection point between the machine nest and the main workshop is selected as the characteristic point of the machine nest section, and other characteristic points of the machine nest section are obtained through mathematical calculations; The coordinate point of the main transformer tunnel vault is selected as the characteristic point of the main transformer tunnel section, and other characteristic points of the main transformer tunnel section are obtained through mathematical operations; The arch top coordinate point of the tailgate is selected as the characteristic point of the tailgate section, and other characteristic points of the tailgate section are obtained through mathematical operations; The characteristic points corresponding to the cross section of each main structure are formed into lines, inlaid, and extruded to obtain a model of each main structure.

6. The parametric modeling method of an underground powerhouse cavern group according to claim 1 is characterized in that: The method for constructing the connection hole framework in step S12 includes: The coordinate point of the main transformer tunnel vault is selected as the characteristic point of the main transformer tunnel cross section, and other characteristic points of the main transformer tunnel cross section are obtained through mathematical operation; The coordinate points of the busbar tunnel vault are selected as the characteristic points of the busbar tunnel section, and other characteristic points of the busbar tunnel section are obtained through mathematical operations; The coordinate point of the tailwater pipe axis is selected as the characteristic point of the tailwater pipe cross section, and other characteristic points of the tailwater pipe cross section are obtained through mathematical operations; The connection point between the tailwater gate and the tailwater tunnel is selected as the tailwater gate section, and other characteristic points of the tailwater gate section are obtained through mathematical calculations; The characteristic points corresponding to the cross section of each connecting hole are formed into lines, inlaid with surfaces, and extruded to obtain a model of each connecting hole.

7. A method for constructing a grid model of an underground powerhouse cavern group, which is implemented based on the parametric modeling method of an underground powerhouse cavern group according to any one of claims 1 to 6, characterized in that: The following steps are involved: S21, using the grid command provided by the Rhino software to grid the combined underground powerhouse model obtained in step S13; S22. With the help of the Griddle plug-in, use the GI function to set the minimum tolerance and connection method to connect the grids; S23. Use the GS function to set the mesh type and the maximum and minimum mesh edge length parameters, and set the names of each structure to encrypt the mesh; S24. Use the GV function to set the output grid type and format, select the range of the grid to be output, and then output the grid file to obtain the constructed grid model of the underground factory building.

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