Accurate sloping design and earth volume dynamic optimization method for electric power engineering

Abstract

The invention relates to the technical field of engineering optimization, in particular to an accurate sloping design and earth volume dynamic optimization method oriented to electric power engineering. According to the method, the technical problem that the slope boundary of the complex terrain is not accurately determined is solved through the steps of dynamically shifting the polyline, performing multi-stage encryption intersection, performing three-dimensional topology reconstruction and the like. According to the method, a gradient trigger encryption mechanism and combined integral earthwork calculation are innovatively introduced, in the scenes such as a transformer substation side slope and a power transmission line tower footing, the slope boundary precision is improved by 300% or above, the earthwork volume calculation error is controlled within 5%, and the reliability and economical efficiency of electric power engineering design are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering optimization, and particularly relates to a precise slope design and dynamic earthwork volume optimization method for electric power engineering. BACKGROUND

[0002] In the electric power engineering site design, such as the substation slope and the transmission line tower foundation excavation, the accuracy of the slope design and the earthwork volume calculation directly affects the engineering safety and cost. The slope design and the earthwork volume calculation are the technical basis and key of all excavation and backfill projects. Unreasonable slope design is the main cause of the collapse of foundation pits and trenches, which can cause accidents such as personnel casualties and equipment damage. The earthwork volume is the key to project investment and cost control, and the size of the earthwork volume determines the duration of the earthwork project and is the prerequisite for preparing a feasible construction schedule calculation. Therefore, scientific and reasonable slope design and earthwork volume optimization are crucial to the safety and cost of the project.

[0003] At present, the existing technology usually relies on general software such as Civil3D to perform slope design and earthwork volume optimization. Firstly, the general algorithm adopts uniform sampling, which has poor adaptability to terrain mutations such as ridges and valleys, resulting in a rough boundary between the slope boundary and the natural terrain, and a problem of rough boundary calculation. Secondly, the traditional cross-section method or simple curved surface method has an error of more than 15% in complex terrain, especially for new energy projects in special topography such as "shago desert", and the calculation deviation leads to uncontrolled cost, resulting in a problem of large error in earthwork volume calculation. And the existing parametric slope component, such as the Civil3D component editor, although supports multi-level slope, the slope ratio and the width of the horse track need to be adjusted manually step by step, and cannot be optimized in real time according to the terrain. SUMMARY

[0004] In order to solve the technical problems of rough boundary calculation in slope design and large error in earthwork volume calculation, the purpose of the present application is to provide a precise slope design and dynamic earthwork volume optimization method for electric power engineering, and the technical scheme adopted is as follows: Obtain the basic data of the electric power engineering site, including the reference polyline; Perform dynamic offset calculation, and generate upper boundary polyline and lower boundary polyline by weighted offsetting the reference polyline according to the terrain curvature; Obtain the slope boundary point set by basic line intersection and adaptive encryption intersection through a multi-level encryption intersection system; the basic line is obtained by connecting the reference polyline with the upper boundary polyline and the lower boundary polyline, respectively; Reconstruct the three-dimensional topography based on the electric power engineering slope design specification and the slope boundary point set to generate the three-dimensional slope boundary polyline; The slope surface is constructed according to the three-dimensional slope boundary multi-segment line, and the combined integral method is used to calculate the earthwork between the slope surface and the three-dimensional terrain grid surface. The slope ratio parameter is dynamically adjusted, multiple slope schemes are compared, and an optimal slope design scheme and an earthwork report are output.

[0005] Further, the execution of the dynamic offset calculation includes: The basic data of the electric power engineering site further includes: the elevation of the reference multi-segment line, the slope design parameter, the three-dimensional terrain grid surface, and the highest and lowest elevations thereof; According to the elevation of the reference multi-segment line, the highest and lowest elevations of the three-dimensional terrain grid surface, the upward offset distance and the downward offset distance are determined; The convex and concave inflection points in the reference multi-segment line are identified, and the curvature radii of the inflection points are calculated; The convex inflection points are compensated by increasing the offset distance by 5%-10%, and the concave inflection points are compensated by reducing the offset distance by 3%-5%; According to the compensated offset distance, the upper boundary multi-segment line and the corresponding highest elevation, and the lower boundary multi-segment line and the corresponding lowest elevation are generated.

[0006] Further, the multi-level encryption intersection system is used to obtain the slope boundary point set through basic connection line intersection and adaptive encryption intersection, including: The basic connection lines are generated by connecting the reference multi-segment line with the upper boundary multi-segment line and the reference multi-segment line with the lower boundary multi-segment line, respectively, and a basic connection line set is constructed; The slope change rate of the three-dimensional terrain grid surface is calculated, and the region with a slope change rate greater than 15° is identified as a steep slope region; The encryption connection lines are automatically increased in the steep slope region; The basic connection lines and the three-dimensional terrain grid surface are intersected to obtain the slope boundary point set P1; The encryption connection lines and the three-dimensional terrain grid surface are intersected to obtain the slope boundary point set P2.

[0007] Further, the encryption connection lines are automatically increased in the steep slope region, including: When the basic connection line spacing is greater than 10m, the first-level encryption is started, and the encryption connection lines with a step length of 2m are inserted; When the slope change rate is monitored to be between [15°, 25°], the second-level encryption is started, and the encryption connection lines with a step length of 1m are inserted; When the slope change rate is monitored to be greater than 25°, the third-level encryption is started, and the encryption connection lines with a step length of 0.5m are inserted; The number N of the encrypted connection is N=L / d, wherein L is a reference connection pitch, d is a step of dynamic encryption, and N is rounded.

[0008] Further, the three-dimensional topological reconstruction is performed based on the power engineering slope design specification and the benching boundary point set to generate a three-dimensional benching boundary polyline, including: The intersection of the benching boundary point set P1 and the benching boundary point set P2 is obtained to obtain a boundary point set; The boundary point set is subjected to noise filtering and abnormal point elimination; Based on the filtered boundary point set, an initial triangular network is constructed; According to the constraint condition, the invalid triangle is pruned to generate a smooth and continuous three-dimensional benching boundary polyline; The constraint conditions include a road width constraint, a slope ratio constraint, and a slope height constraint.

[0009] Further, the benching surface is constructed according to the three-dimensional benching boundary polyline, and the earthwork between the benching surface and the three-dimensional terrain grid surface is calculated by using a combined integral method, including: Based on the reference polyline and the three-dimensional benching boundary polyline, the benching surface is constructed; The space between the benching surface and the three-dimensional terrain grid surface is divided into a plurality of prismatic units; The Simpson integral formula is used to calculate the volume of each prismatic unit: V i =(A i1 +4A i2 +A i3 ) / 6×h i ; Wherein, A i1 , A i2 , A i3 are the areas of the three sections of the prismatic unit, and h i is the unit height; The volumes of all prismatic units are added to calculate the total excavation amount and the total filling amount, and the earthwork includes the total excavation amount and the total filling amount.

[0010] Further, the slope ratio parameter is dynamically adjusted, a plurality of benching schemes are compared, and an optimal benching design scheme and an earthwork report are output, including: A plurality of candidate values of the slope ratio parameter are provided, and each candidate value of the slope ratio parameter corresponds to a benching scheme; For each candidate value of the slope ratio parameter, the earthwork corresponding to each candidate value of the slope ratio parameter is determined; The cost is evaluated based on the earthwork; The slope design scheme with the lowest total cost and meeting the safety requirement is selected as the optimal slope design scheme, and a corresponding earthwork volume report is generated.

[0011] The embodiments of the present application have at least the following beneficial effects: The present application first combines terrain curvature analysis with slope offset algorithm, significantly improves the convex corner boundary shrinkage problem through curvature weighted compensation mechanism, proposes gradient trigger encryption mechanism to change the redundant calculation mode of traditional uniform encryption, and realizes accurate positioning of the encryption area. Deeply integrate the requirements of power engineering specifications, implant standard slope ratio, driveway size, etc. as constraint conditions into the three-dimensional reconstruction process to ensure design compliance. Build a "design-computation-optimization" closed loop, dynamically adjust the slope ratio parameters through earthwork volume multi-scheme comparison, and realize the optimal engineering economy. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0013] Figure 1 A method flowchart of a precise slope design and earthwork dynamic optimization method for power engineering provided by an embodiment of the present application; Figure 2 Another method flowchart of a precise slope design and earthwork dynamic optimization method for power engineering provided by an embodiment of the present application; Figure 3 A system block diagram of a precise slope design and earthwork dynamic optimization system for power engineering provided by an embodiment of the present application; Figure 4 A plane schematic diagram after inserting the encryption connection provided by an embodiment of the present application; Figure 5 A plane schematic diagram of the terrain triangulation network after inserting the encryption connection provided by an embodiment of the present application; Figure 6 A cross-sectional schematic diagram of the A-A section position line after inserting the encryption connection provided by an embodiment of the present application; Figure 7 An effect schematic diagram of site excavation after inserting the encryption connection provided by an embodiment of the present application. DETAILED DESCRIPTION

[0014] In order to further illustrate the technical means and effects taken by the present application to achieve the predetermined inventive objectives, the following describes in detail the specific implementation method, structure, features and effects of a precise slope design and dynamic earthwork volume optimization method for power engineering according to the present application, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0016] The embodiment of the present application provides a specific implementation method of a precise slope design and dynamic earthwork volume optimization method for power engineering. The method is suitable for the scene of slope design and earthwork volume calculation. The present application realizes sub-meter level slope boundary precision, improves the density of boundary control points by more than 5 times through encrypted connection and line-by-line intersection with the terrain surface. The earthwork volume error is less than or equal to 5%, the slope surface is constructed based on the precise boundary, and the excavation and filling volume is calculated by combining the combination integral method. The power engineering scene is self-adaptive. For typical scenes such as substation slope and tower foundation pit, a preset slope ratio rule library is supported to generate compliant slope with one key.

[0017] The specific scheme of the precise slope design and dynamic earthwork volume optimization method for power engineering provided by the present application will be described in detail below in combination with the accompanying drawings.

[0018] Please refer to Figure 1 which shows the step flowchart of the precise slope design and dynamic earthwork volume optimization method for power engineering provided by the embodiment of the present application. The method includes the following steps: Step S100, acquiring the basic data of the power engineering site, including the reference polyline.

[0019] The basic data of the power engineering site includes: reference polyline, elevation h1 of reference polyline, slope design parameter 1: k, three-dimensional terrain grid surface GridSurface, highest elevation th of three-dimensional terrain grid surface and lowest elevation bh. It should be noted that the slope design parameter is also the slope ratio parameter. In the embodiment of the present application, multiple candidate values of the slope ratio parameter are provided, for example, the candidate values of the slope ratio parameter can be 1:1.5, 1:1.75, 1:2, etc.

[0020] Step S200, performing dynamic offset calculation, weighting and offsetting the reference polyline according to the terrain curvature, generating upper boundary polyline and lower boundary polyline.

[0021] According to the elevation of the reference polyline, the highest elevation and the lowest elevation of the three-dimensional terrain mesh surface, the upward offset distance and the downward offset distance are determined; The calculation formula of the upward offset distance ΔL1 is: ΔL1=(th-h1) / k.

[0022] The calculation formula of the downward offset distance ΔL2 is: ΔL2=(h1-bh) / k.

[0023] Convex inflection points and concave inflection points in the reference polyline are identified, and the curvature radius of each inflection point is calculated; The offset distance of the convex inflection point is increased by 5%-10% for compensation, and the offset distance of the concave inflection point is reduced by 3%-5%. The curvature weighted offset is introduced, the offset compensation of the convex inflection point is increased, and the boundary contraction at the sharp corner is avoided.

[0024] According to the offset distance after compensation, the upper boundary polyline polyline_1 and the corresponding highest elevation, and the lower boundary polyline polyline_2 and the corresponding lowest elevation are generated.

[0025] In step S300, a multi-level encryption intersection system is used to obtain the slope boundary point set through basic line intersection and adaptive encryption intersection; the basic line is obtained by connecting the reference polyline with the upper boundary polyline and the lower boundary polyline respectively.

[0026] The corresponding vertices of the reference polyline and the upper boundary polyline polyline_1, and the corresponding vertices of the reference polyline and the lower boundary polyline are connected respectively to generate the basic line, and a basic line set LN1 is constructed; The slope change rate of the three-dimensional terrain mesh surface is calculated, and the region with a slope change rate greater than 15° is identified as a steep slope region; The encryption line is automatically added in the steep slope region, and the encryption step is dynamically adjusted between 0.5m-2m according to the slope value, specifically: When the basic line spacing is greater than 10m, the first level encryption is started, and the encryption line is automatically inserted; more specifically, the encryption line with a step of 2m is inserted; When the slope change rate is monitored to be between [15°, 25°], the second level encryption is started, and the encryption line with a step of 1m is inserted; When the slope change rate is monitored to be greater than 25°, the third level encryption is started, and the encryption line with a step of 0.5m is inserted; The number N of the encryption line is: N=L / d, wherein L is the reference line spacing, d is the dynamic encryption step, and N is an integer, which can be specifically processed by taking the integer part.

[0027] The basic line and the three-dimensional terrain mesh surface are intersected to obtain the slope boundary point set P1; The intersection calculation of the encryption connection and the three-dimensional terrain mesh surface is performed to obtain a slope boundary point set P2.

[0028] Compared with the method of uniformly encrypting the steep slope area, the gradient triggering encryption mechanism is adopted in the embodiment of the application, the calculation amount is reduced by 40, and the boundary precision is improved.

[0029] Please refer to Figure 4 , Figure 4 It is a plan view after inserting the encryption connection, Figure 4 The line between A-A in the figure is the cutting position line corresponding to the subsequent cross section view; Please refer to Figure 5 , Figure 5 It is a plan view in the form of a terrain triangulation network after inserting the encryption connection, Figure 5 The line between A-A in the figure is the cutting position line corresponding to the subsequent cross section view; Please refer to Figure 6 , Figure 6 It is a cross section view at the cutting position line A-A after inserting the encryption connection; Please refer to Figure 7 , Figure 7 It is an effect view of site excavation after inserting the encryption connection.

[0030] In step S400, based on the power engineering slope design specification and the slope boundary point set, three-dimensional topological reconstruction is performed to generate a three-dimensional slope boundary polyline.

[0031] The intersection of the slope boundary point set P1 and the slope boundary point set P2 is obtained to obtain a boundary point set P1∪P2; The boundary point set is subjected to noise filtering and abnormal point rejection; Based on the filtered boundary point set, an initial triangular network is constructed according to the Delaunay triangulation method; According to the constraint condition, invalid triangles are pruned to generate a smooth and continuous three-dimensional slope boundary polyline polyline3d_3.

[0032] The constraint conditions include: a horse path width constraint, a slope ratio constraint, and a slope height constraint.

[0033] More specifically, the horse path width constraint is that the minimum horse path width is not less than 2m. The slope ratio constraint is that the slope ratio is limited to be between 1:1 and 1:2 according to the soil type. The slope height constraint is that the single-stage slope height is not more than 8m.

[0034] In step S500, a slope surface is constructed according to the three-dimensional slope boundary polyline, and the earthwork between the slope surface and the three-dimensional terrain mesh surface is calculated by using the combined integral method.

[0035] Based on the baseline polyline and the three-dimensional slope boundary polyline polyline3d_3, a slope surface Gradesurface is constructed.

[0036] The space between the slope surface Gradesurface and the 3D terrain mesh surface GridSurface is divided into multiple prism elements. It should be noted that this 3D terrain mesh surface is the original terrain surface.

[0037] The volume of each prism element is calculated using Simpson's integral formula: V i =(A i1 +4A i2 +A i3 ) / 6×h i ; Among them, A i1 A i2 A i3 Let h represent the areas of the three cross sections of the prism element. i Unit height; The volumes of all prism elements are summed to calculate the total excavation and fill volumes, respectively; the earthwork volume includes the total excavation and fill volumes.

[0038] Finally, the accuracy of the calculation results was verified by the multiple integration method to ensure that the error was controlled within 5%.

[0039] Step S600: Dynamically adjust the slope ratio parameters, compare multiple slope protection schemes, and output the optimal slope protection design scheme and earthwork volume report.

[0040] Multiple candidate values ​​for the slope ratio parameter are provided, and each candidate value corresponds to a slope design. For example, the candidate values ​​for the slope ratio parameter can be 1:1.5, 1:1.75, 1:2, etc.

[0041] Repeat steps S100 to S500 to calculate the earthwork volume corresponding to each candidate value of the slope ratio parameter. Cost assessment is conducted based on the earthwork volume calculation results, taking into account factors such as excavation costs, filling costs, and transportation costs. Ensure that each slope protection scheme meets the slope stability requirements of power engineering.

[0042] The slope protection scheme with the lowest total cost and that meets safety requirements is selected as the final design scheme, also known as the optimal slope protection design scheme, and a corresponding earthwork volume report is generated.

[0043] Please see Figure 2 , Figure 2 This is a flowchart of another method for precise slope design and dynamic optimization of earthwork volume in power engineering.

[0044] The application comprises a terrain adaptive encryption mechanism, realizes dynamic adjustment of encryption density based on slope change, and balances efficiency and accuracy; power engineering rules are built-in, and the slope ratio requirements in the slope design specification of power engineering are integrated to automatically check the safety of the slope; real-time earthwork balance optimization: combined with the least square method, when the difference between excavation and filling volume is >10%, an automatic warning and optimization scheme are recommended.

[0045] A specific implementation data is given in the embodiment of the application: Input data: The reference polyline is the transformer substation pit bottom line, and the corresponding elevation is 48.5 m; When the elevation range of the three-dimensional terrain grid surface is 42.3 m-55.6 m, the highest elevation is 55.6 m, and the lowest elevation is 42.3 m; The slope ratio parameter is set to 1:1.5, wherein the secondary slope, the width of the horse path is 2 m.

[0046] The execution process includes offset calculation, encryption intersection, and earthwork calculation: Offset calculation: The upper offset distance ΔL1 is: ΔL1=(55.6-48.5) / 1.5=4.73 m.

[0047] The lower offset distance ΔL2 is: ΔL2=(48.5-42.3) / 1.5=4.13 m.

[0048] Encryption intersection: Basic connecting line: 24 connecting lines are generated, and 38 slope boundary points are obtained by intersection; Gradient encryption after encryption connecting line: 31 encryption connecting lines are added in the southeast corner steep slope area (slope 22°), and 19 slope boundary points are supplemented.

[0049] Earthwork calculation: Construction of slope surface: after integral combination, the excavation volume is 3856 m³, and the filling volume is 1203 m³.

[0050] Optimization adjustment: after adjusting the slope ratio parameter to 1:1.75, the excavation volume is reduced to 3412 m³, and the balance degree is improved by 11%.

[0051] Effect verification: Compared with the traditional Civil3D slope: the number of boundary points increases by 320% (157 vs. 38), and the earthwork volume error decreases from 14.7% to 3.8%.

[0052] Satisfy the horse path width requirement in the slope design specification of the transformer project, and the model can be directly output to the BIM platform.

[0053] As a preferred embodiment of the present application, this scheme is not only applicable to power engineering scenarios, but also applicable to substation foundation slope scenarios, optimized for substation foundation characteristics, supporting multi-level slope design; also applicable to transmission line tower foundation slope scenarios, adapting to circular or square foundation forms of transmission tower foundations, providing corresponding slope templates; also applicable to new energy station slope scenarios, optimized for special requirements of photovoltaic field, wind power foundation and other new energy power facilities; also applicable to steep mountainous area tower foundation slope scenarios, providing special slope design schemes for mountainous area transmission line tower foundations.

[0054] Please refer to Figure 3 , Figure 3 A system block diagram of a precision slope design and dynamic earthwork optimization system for power engineering is provided for an embodiment of the present application, and the system comprises: A data input interface module is configured to obtain the basic data of the power engineering site, including the reference polyline; A polyline offset correction module is configured to offset the reference polyline according to the terrain curvature to generate an upper boundary polyline and a lower boundary polyline; A slope design core engine is configured to obtain slope boundary point sets through basic connection line intersection and adaptive encryption intersection by using a multi-level encryption intersection system; the basic connection line is obtained by connecting the reference polyline to the upper boundary polyline and the lower boundary polyline, respectively; Three-dimensional topological reconstruction is performed based on the power engineering slope design specification and the slope boundary point set to generate a three-dimensional slope boundary polyline; An earth cube calculation module is configured to construct a slope surface according to the three-dimensional slope boundary polyline, and calculate the earthwork between the slope surface and the three-dimensional terrain grid surface by using a combined integral method; A result output interface module is configured to dynamically adjust the slope ratio parameter, compare multiple slope schemes, and output an optimal slope design scheme and an earthwork report; A BIM integration interface is configured to exchange data with mainstream BIM platforms and support IFC format output.

[0055] In some possible implementations, the slope design core engine further comprises: A real-time preview module is configured to display the slope boundary changes and the earthwork changes in real time during the parameter adjustment process; A conflict detection module is configured to automatically detect conflicts between the slope design and existing power facilities, including safety distance verification with towers, cable trenches, and distribution devices; An engineering quantity statistical module is configured to automatically generate a slope-related bill of quantities, including slope surface protection quantities and drainage facility quantities; A construction drawing generation module is configured to automatically generate slope construction drawings in accordance with the power engineering design drawing standards.

[0056] As a preferred embodiment of the present application, when applied to a 220kV substation foundation pit project, a three-stage slope design is adopted, the width of the road is 2.5m, and the slope ratio is 1:1.75; when applied to a 500kV transmission line tower foundation project in mountainous areas, a 1:1 steep slope design is adopted for rock foundation, combined with soil retaining wall measures; when applied to a photovoltaic power generation field area leveling project, a 1:2 gentle slope design is adopted to reduce the amount of earthwork excavation; when applied to a wind power foundation excavation project, a circular slope design is adopted to adapt to the special shape requirements of the wind turbine foundation.

[0057] The embodiment of the present application also provides a computer readable storage medium, which stores computer program codes, and when the computer program codes run on a computer, the computer executes the related method steps to realize the precision slope design and dynamic optimization of earthwork quantity for power engineering provided by the above embodiment.

[0058] The storage medium also includes a power engineering specification database, which stores industry standard data such as power engineering slope design specifications and substation slope design regulations; a slope ratio parameter template library, which stores recommended slope ratio parameters for different soil types and different engineering scenarios; a case database, which stores slope design schemes and actual earthwork quantity data of historical engineering cases; and a parameterized component library, which includes: standardized slope ratio components, which provide parameterized models of standard slope ratios such as 1:1, 1:1.5, 1:1.75 and 1:2; road components, which provide standard road models with widths of 2m, 2.5m and 3m; slope protection components, which provide slope protection measures such as lattice beams, arched skeletons and grass protection; and drainage system components, which provide drainage facilities models such as slope drainage ditches and interception ditches; the component library supports parameter-driven adjustment of size and configuration according to specific engineering requirements.

[0059] The embodiment of the present application also provides a computer program product, which, when running on a computer, causes the computer to execute the above related steps to realize the precision slope design and dynamic optimization of earthwork quantity for power engineering provided by the above embodiment.

[0060] It should be noted that the above-mentioned embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0061] Each embodiment in the specification is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other, and each embodiment mainly describes the differences from other embodiments.

Claims

1. A method for precise slope design and dynamic optimization of earthwork volume in power engineering, characterized in that, The method includes the following steps: Obtain basic data for the power engineering site, including baseline polylines; Perform dynamic offset calculations, weighted offset the baseline polyline according to the terrain curvature, and generate upper and lower boundary polylines. A multi-level encrypted intersection system is adopted to obtain the set of slope boundary points through basic line intersection and adaptive encrypted intersection; the basic line is obtained by connecting the upper boundary polyline and the lower boundary polyline respectively with the reference polyline. Three-dimensional topology reconstruction is performed based on the power engineering slope design specifications and the slope boundary point set to generate a three-dimensional slope boundary polyline. A slope surface is constructed based on the three-dimensional slope boundary polyline, and the earthwork volume between the slope surface and the three-dimensional terrain mesh surface is calculated using the combined integral method. The slope ratio parameter is dynamically adjusted, multiple slope protection schemes are compared, and the optimal slope protection design scheme and earthwork volume report are output.

2. The method for precise slope design and dynamic optimization of earthwork volume in power engineering according to claim 1, characterized in that, The dynamic offset calculation involves weighted offsetting of the baseline polyline based on terrain curvature to generate upper and lower boundary polylines, including: The basic data for the power engineering site also includes: the elevation of the benchmark polyline, slope design parameters, three-dimensional terrain grid surface and its highest and lowest elevations; Determine the upward and downward offset distances based on the elevation of the baseline polyline and the highest and lowest elevations of the three-dimensional terrain grid surface; Identify convex and concave inflection points in a baseline polyline and calculate the radius of curvature of each inflection point; For convex inflection points, increase the offset distance compensation by 5%-10%; for concave inflection points, reduce the offset distance by 3%-5%. Based on the compensated offset distance, generate the upper boundary polyline and its corresponding highest elevation, and the lower boundary polyline and its corresponding lowest elevation.

3. The method for precise slope design and dynamic optimization of earthwork volume in power engineering according to claim 1, characterized in that, The multi-level encrypted intersection system obtains the set of slope boundary points through basic line intersection and adaptive encrypted intersection, including: Connect the baseline polyline to the upper boundary polyline and the baseline polyline to the lower boundary polyline respectively to generate basic connections and construct a set of basic connections; Calculate the slope change rate of the three-dimensional terrain mesh surface and identify areas with a slope change rate greater than 15° as steep slope areas; Automatically add encrypted connections in steep slope areas; The intersection calculation between the basic connecting lines and the three-dimensional terrain mesh surface is performed to obtain the slope boundary point set P1; The intersection of the encrypted connection with the three-dimensional terrain mesh surface is calculated to obtain the slope boundary point set P2.

4. The method for precise slope design and dynamic optimization of earthwork volume in power engineering according to claim 3, characterized in that, The automatic addition of encrypted connections in steep slope areas includes: When the spacing between basic connections is greater than 10m, first-level encryption is activated, and encrypted connections with a step size of 2m are inserted. When the slope change rate is detected to be between [15°, 25°], secondary encryption is initiated, and encryption lines with a step size of 1m are inserted; When the slope change rate is detected to be greater than 25°, a third-level densification is initiated, inserting densification lines with a step size of 0.5m; The number of encrypted connections N is: N = L / d, where L is the baseline connection spacing, d is the step size of dynamic encryption, and N is rounded to the nearest integer.

5. The method for precise slope design and dynamic optimization of earthwork volume in power engineering according to claim 3, characterized in that, The method involves performing three-dimensional topology reconstruction based on power engineering slope design specifications and slope boundary point sets to generate three-dimensional slope boundary polylines, including: Find the intersection of the slope boundary point set P1 and the slope boundary point set P2 to obtain the boundary point set; Noise filtering and outlier removal are performed on the boundary point set; Based on the filtered set of boundary points, an initial triangular network is constructed; Trim invalid triangles according to constraints to generate smooth and continuous three-dimensional slope boundary polylines; The constraints include: trail width constraint, slope ratio constraint, and slope height constraint.

6. The method for precise slope design and dynamic optimization of earthwork volume in power engineering according to claim 1, characterized in that, The process of constructing a slope surface based on a three-dimensional slope boundary polyline and calculating the earthwork volume between the slope surface and the three-dimensional terrain mesh surface using a combined integral method includes: Based on the baseline polyline and the three-dimensional slope boundary polyline, a slope surface is constructed. The space between the slope surface and the three-dimensional terrain mesh surface is divided into multiple prism units; The volume of each prism element is calculated using Simpson's integral formula: V i =(A i1 +4A i2 +A i3 ) / 6×h i ; Among them, A i1 A i2 A i3 Let h represent the areas of the three cross sections of the prism element. i Unit height; The volumes of all prism elements are summed up, and the total excavation and filling volumes are calculated separately. The earthwork volume includes the total excavation and filling volumes.

7. The method for precise slope design and dynamic optimization of earthwork volume in power engineering according to claim 1, characterized in that, The dynamically adjusted slope ratio parameters compare multiple slope protection schemes and output the optimal slope protection design scheme and earthwork volume report, including: It provides multiple candidate values ​​for the slope ratio parameter, and each candidate value for the slope ratio parameter corresponds to a slope protection scheme; For each candidate value of the slope ratio parameter, determine the earthwork volume corresponding to each candidate value of the slope ratio parameter; Cost assessment based on earthwork volume; Select the slope protection scheme with the lowest total cost and that meets safety requirements as the optimal slope protection design scheme, and generate the corresponding earthwork volume report.

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