CN117171846A - Three-dimensional design method and system for roadbed transition section - Google Patents

Three-dimensional design method and system for roadbed transition section Download PDF

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Publication number
CN117171846A
CN117171846A CN202311098557.9A CN202311098557A CN117171846A CN 117171846 A CN117171846 A CN 117171846A CN 202311098557 A CN202311098557 A CN 202311098557A CN 117171846 A CN117171846 A CN 117171846A
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transition section
creating
roadbed
model
section
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Inventor
谢先当
解治敏
刘厚强
董凤翔
刘江涛
徐骏
李东升
付海清
黄武
伍丹琪
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China Railway Eryuan Engineering Group Co Ltd CREEC
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China Railway Eryuan Engineering Group Co Ltd CREEC
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/60Planning or developing urban green infrastructure

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Abstract

The invention relates to the field of geotechnical engineering design, in particular to a three-dimensional design method and system for a roadbed transition section. The method comprises the following steps: generating a three-dimensional model of the roadbed transition section according to the basic data, wherein the three-dimensional model is used for generating a longitudinal section diagram, a cross section diagram and the engineering quantity; the three-dimensional model generation step comprises the following steps: creating a soil and stone body, dividing the soil and stone body, creating steps, creating a sand-free concrete slab, creating a foundation pit backfill and creating a seepage drainage pipe; the basic data comprise the type of the transition section, the size parameter of the main body part of the transition section, the size parameter of the backfill part of the foundation pit, the size parameter of a pipeline of the transition section for seepage and drainage and the size parameter of a step of excavation of the transition section. By creating the fine model of the transition section, a designer can count the engineering quantity more accurately, and can modify parameters conveniently at any time through the model to adjust the model, so that the design efficiency and accuracy are improved greatly.

Description

Three-dimensional design method and system for roadbed transition section
Technical Field
The invention relates to the field of geotechnical engineering design, in particular to a three-dimensional design method and system for a roadbed transition section.
Background
In roadbed engineering design, in order to ensure the safety and stability of the transition between the roadbed and other interface engineering (bridge, tunnel, culvert, etc.), special design is usually required for the roadbed of the transition section. The current design method of the transition section is based on two-dimensional design, firstly, the longitudinal section shape of the transition section is drawn on a roadbed longitudinal section diagram (figure 1), and then the size of each part is determined through a representative section diagram according to the section sectioning position (figure 2).
In the design process of the transition section, a designer firstly draws the basic shape of the transition section in a longitudinal section diagram, determines the section size parameter and finishes drawing the longitudinal section diagram of the transition section; drawing a typical cross-sectional schematic diagram, determining the dimension parameters of the cross-sectional diagram, and finishing drawing the cross-sectional diagram; and finally, estimating the engineering quantity according to the drawing, and completing the design of the roadbed transition section. The current design has several problems: (1) The design diagram of the transition section has only one typical vertical section and one typical cross section, and a designer cannot accurately grasp the detailed structure of the transition section (such as only giving the slope of the excavation of the transition section in the vertical section diagram and actually needing to excavate steps), so that the design scheme is inaccurate; (2) Estimating the engineering quantity according to the design drawing and engineering experience, so that the engineering quantity calculated by the transition section has larger deviation from the actual engineering quantity, and the engineering cost is calculated inaccurately; (3) In the construction stage of the transition section, because the drawing expression is not visual and the engineering quantity calculation is inaccurate, the meaning of the design result on the guidance of construction is weakened, and the design value cannot be reflected.
Disclosure of Invention
Aiming at the problems existing in the current roadbed transition section design, the BIMBase software platform is used for secondary development, a three-dimensional design method of the roadbed transition section based on BIM is provided, the design process is visualized, the design result is embodied, and a design system is formed.
In order to achieve the above object, the present invention provides the following technical solutions:
a three-dimensional design method of a roadbed transition section comprises the following steps:
generating a three-dimensional model of the roadbed transition section according to the basic data, wherein the three-dimensional model is used for generating a longitudinal section diagram, a cross section diagram and the engineering quantity;
the three-dimensional model generation step comprises the following steps: creating a soil and stone body, dividing the soil and stone body, creating steps, creating a sand-free concrete slab, creating a foundation pit backfill and creating a seepage drainage pipe; the basic data comprise the type of the transition section, the size parameter of the main body part of the transition section, the size parameter of the backfill part of the foundation pit, the size parameter of a pipeline of the transition section for seepage and drainage and the size parameter of a step of excavation of the transition section.
The method is characterized by further comprising the step of creating a vertical section design view port and a roadbed vertical section, wherein data of the roadbed vertical section comprises a line, a roadbed foundation bed, a ground line and a transition section, and the data of the roadbed vertical section is used as basic data for adjusting the position and the size of the transition section of the three-dimensional model.
Preferably, the step of creating the earth-rock cube comprises: and creating a foundation bed surface layer and a embankment below a foundation bed at the foundation bed bottom layer according to the line, the ground model and the roadbed design principle data.
Preferably, the step of dividing the earth and stone body comprises: creating a filling edge line according to the distance between the road shoulder and the filling edge and the slope rate of the filling edge line; cutting the roadbed along the arrangement direction of the transition section by using the filling edge line, and respectively cutting the roadbed surface layer and the embankment below the roadbed at the bottom of the roadbed into 3 blocks, wherein the three blocks comprise a left part, a middle part and a right part, so as to generate a cut earth-rock cube.
Preferably, the creating the step includes:
step base points are arranged on the upper part of the surface layer of the foundation bed at the end point of the transition section, and step lines are built layer by layer downwards from the step base points according to the parameters of the total height of the steps, the step slope rate, the single-stage step height and the width so as to achieve the condition that the total height of the steps is used as a building termination;
and cutting the cut earth and stone body along the arrangement direction perpendicular to the transition section by using the step line to obtain a step-shaped earth and stone body.
Preferably, the creation of the sand-free concrete slab comprises the steps of:
setting a base point position of a non-sand concrete plate on the upper part of a base bed surface layer at the starting point of the transition section, generating a plate model at the base point position of the non-sand concrete plate according to the size parameter of the plate, performing Boolean shearing operation on the plate model and the step-shaped earth-rock body, and shearing off the overlapping part of the step-shaped earth-rock body and the plate.
Preferably, the creating the foundation pit backfilling comprises the following steps:
setting a foundation point of a foundation pit backfill model at the bottom of a step-shaped earth-rock cube at the starting point of the transition section; and creating a backfill body section according to the foundation pit backfill parameters, and then stretching the length of one backfill body along the direction perpendicular to the arrangement direction of the transition section by taking the base point of the foundation pit backfill model as a starting point to generate the foundation pit backfill model.
Preferably, the creating the infiltration drain pipe comprises the following steps:
a base point of a seepage and drainage pipe model is arranged at the bottom point of the stepped earth and stone body at the starting point of the transition section;
creating a square section according to side length parameters in the seepage and drainage pipe parameters, creating a drainage pipe section according to pipe diameter parameters, then stretching the two sections to two sides along the arrangement direction perpendicular to the transition section by clinging to a ground model, so as to stretch to the slope toe to stop, performing Boolean shearing operation on the generated round pipe body and rectangular cylinder, shearing off the overlapped part of the round pipe body and the rectangular cylinder, deleting the round pipe body, generating a hollow rectangular cylinder, finally shearing the part of the hollow rectangular cylinder beyond the slopes at two sides by using the slope surfaces, deleting the exceeding part, and completing the creation of the seepage and drainage pipe model.
Preferably, the transition section type comprises a roadbed and bridge transition section, a roadbed and transverse structure transition section and a roadbed and tunnel transition section.
Based on the same conception, a three-dimensional design system of the roadbed transition section is also provided, which comprises at least one processor and a memory in communication connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of the preceding claims.
Compared with the prior art, the invention has the beneficial effects that:
compared with the traditional design method, the method solves the problem that the traditional design drawing is not intuitive and inaccurate in showing the detailed structure of the transition section, by creating the fine model of the transition section, a designer can count the engineering quantity more accurately, and the model can be adjusted by modifying parameters conveniently at any time through the model, so that the design efficiency and accuracy are improved greatly.
Drawings
FIG. 1 is a longitudinal section view of a transition section in accordance with the background of the invention;
FIG. 2 is a cross-sectional view of a transition section in the background of the invention;
FIG. 3 is a flow chart of a three-dimensional design method of a BIM-based roadbed transition zone in the embodiment 1 of the present invention;
FIG. 4 is a view of a window interface of a roadbed transition zone according to embodiment 1 of the present invention;
FIG. 5 is a vertical section design window diagram of a transition section in example 1 of the present invention;
FIG. 6 is an interface of a two-dimensional linkage parameterized design in example 1 of the present invention;
FIG. 7 is a schematic view of a model of an earth and stone cube in example 1 of the present invention;
FIG. 8 is a schematic view of a divided earth-rock cube model in example 1 of the present invention;
FIG. 9 is a schematic view of a stepped earth and stone cube model after cutting in example 1 of the present invention;
FIG. 10 is a schematic view of a step-shaped earth and stone block in example 1;
FIG. 11 is a foundation pit backfill model according to example 1 of the present invention;
FIG. 12 is a schematic view of a hollow infiltration drain of example 1 of the present invention;
FIG. 13 is a diagram showing the modification of the parametric model in the two-dimensional linkage mode in embodiment 1 of the present invention;
FIG. 14 is a logic diagram of modification of parameters of a transition section in a dialog box according to the embodiment 1 of the present invention, and modification of a two-dimensional longitudinal section graph and a three-dimensional model of the transition section;
FIG. 15 is a diagram of a model of the roadbed and bridge transition section according to embodiment 1 of the present invention;
FIG. 16 is a diagram showing a model of the transition section of the roadbed and the transverse structures in the embodiment 1 of the present invention;
fig. 17 is a diagram of a model of a roadbed and a tunnel transition section in embodiment 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
The invention relates to a three-dimensional design method and a system for a roadbed transition section, which are based on BIMBase software for secondary development to form an operation interface, but the design method is independent of a platform.
By realizing the AddIn interface provided by the software platform, the custom command can be added into the software, and then the custom command can be executed by clicking the button by binding the command with the interface button. The three-dimensional design system of the roadbed transition section is secondarily developed in the mode, and the design process is packaged into a custom command object.
A three-dimensional design method of a roadbed transition section based on BIM (building information modeling), a flow chart is shown in figure 3, comprises the following steps:
reading line, ground model and roadbed design principle data which are kept in the file; creating a vertical section design viewing port and a roadbed vertical section; obtaining modeling parameters of a transition section; creating a transition section model; and (5) modifying and perfecting the transition section model and outputting a design result. The steps will be described in detail below.
Roadbed transition section program interface
Take roadbed and bridge transition section as examples. Clicking a roadbed transition section creation button in a software interface can call out a roadbed transition section window, wherein the window contains all attribute information of the transition section, such as parameters of transition section type, size, foundation pit backfill, seepage drain pipe, step and the like, and the roadbed transition section window interface is shown in fig. 4.
Wherein [ size ] represents a size parameter of the main body portion of the transition section;
the transition section type is represented, and comprises a roadbed and bridge transition section, a roadbed and tunnel transition section and the like;
[ Foundation pit backfill ] represents a dimensional parameter of a backfill portion of a foundation pit, such as abutment foundation pit backfill;
[ seepage and drainage pipe ] represents the pipeline dimension parameter of the transition section for seepage and drainage;
the step size parameter of the transition section excavation step is represented.
Inputting basic data
Before the roadbed transition section is created, firstly, line, ground model and roadbed design principle data stored in a file are required to be read, and then basic data of the transition section, such as parameters of type, size, foundation pit backfill, seepage and drainage pipe, steps and the like, are input.
Clicking a drop-down box corresponding to the transition section type in the interface, and selecting the corresponding transition section type.
Parameters such as the size of the transition section, backfilling of the foundation pit, seepage and drainage pipe, steps and the like are sequentially input from top to bottom in the parameter table.
Transition section design
And 1, creating a vertical section design view port and a roadbed vertical section. After setting all parameters, clicking a [ vertical section update ] button in a program interface, creating a new view port, initializing a line, a roadbed foundation bed and a vertical section graph of the foundation bed, clicking one point on the foundation bed graph by using a mouse as a creation base point of a transition section, clicking another point on the foundation bed graph, determining the arrangement direction of the transition section by starting and ending points, and initializing a vertical section graph of the transition section according to the set parameters, wherein the graph in the vertical section graph comprises: the device comprises a line, a roadbed foundation bed, a ground line and a transition section. In the profile design view port, a designer can adjust the position and the size of the transition section by modifying parameters of the transition section, a profile design window of the transition section is shown in fig. 5, and lines in the diagram represent a line center line, a foundation bed surface layer, a foundation bed bottom layer and a embankment and a ground line below the foundation bed in sequence.
And 2, creating a transition section model. After the parameter modification is completed, clicking a [ three-dimensional model generation ] button on a program interface, and then establishing a three-dimensional model according to the set parameters, wherein fig. 6 shows an interface of two three-dimensional linkage parameterized designs.
The detailed creation process of the three-dimensional model is as follows:
1. creating a soil-rock body, creating a roadbed soil-rock body according to line, ground model and roadbed design principle data, comprising: a foundation bed surface layer, shoulder pad, foundation bed bottom layer, embankment below the foundation bed, etc., as shown in fig. 7;
2. dividing a soil and stone body, referring to a cross section design diagram of a transition section, setting parameters of 'road shoulder distance from a filling edge' and 'slope rate of the filling edge' in a parameter column of 'size of the transition section', creating a filling edge line according to the two parameters by a program, cutting a road bed along the arrangement direction of the transition section by using a BIMBase original tool by using the filling edge line, dividing a foundation bed bottom layer and a road embankment below the foundation bed into 3 blocks respectively, wherein the three parts comprise a left part, a middle part and a right part, and generating a new soil and stone body after cutting is completed; as shown in fig. 8 (see fig. 2), the middle parts of the foundation bed bottom layer and the embankment below the foundation bed in the transition section are filled with a group of fillers, the left side and the right side are filled with other types of fillers, and the foundation bed bottom layer and the embankment below the foundation bed are cut into 3 blocks, so that one purpose is to facilitate the statistics of the number of subsequent projects. In addition, in the step 3 "create step", it is created based on the middle portion, and the steps do not need to be created on the left and right sides.
3. The method comprises the steps of creating steps, wherein a step base point is positioned at the upper part point of a foundation bed surface layer at the end point of a transition section, the total height of the steps is the height of a road embankment behind the steps, and step lines are created layer by layer from a starting point downwards according to step slope rate, single-stage step height and width parameters in the step parameters so as to achieve the step height as a creating termination condition. The procedure can adopt a BIMBase original tool, the step line is used for cutting the earth and stone body (the bottom layer of the foundation bed and the middle part of the embankment below the foundation bed) cut in the step 2 along the direction perpendicular to the arrangement direction of the transition section, and the step-shaped earth and stone body is cut after the cutting is finished (as shown in figure 9);
4. creating a sandless concrete slab, wherein a base point of the sandless concrete slab is positioned at the upper point of the foundation bed surface layer at the starting point of the transition section, firstly creating a cross section of the slab according to the size parameter of the slab, then stretching the thickness of one slab along the arrangement direction of the transition section to generate a slab model, and finally performing Boolean shearing operation on the slab model and the stepped earth-rock body in the step 3, and shearing off the overlapping part of the stepped earth-rock body and the slab (as shown in figure 10); the boolean pruning operation is a function of modeling software itself, namely, when two entities have overlapping portions, the overlapping portions of one entity and the other entity are pruned. Here, the overlapping part of the stepped earth and stone body and the plate is cut off.
5. Creating a foundation pit backfill, wherein a base point of a foundation pit backfill model is positioned at the starting point of a transition section, and a bottom point of a stepped earth and stone body is positioned at the bottom of the transition section;
6. creating a seepage and drainage pipe, wherein a base point of a seepage and drainage pipe model is positioned at the starting point of a transition section, a bottom point of a stepped earth and stone body is firstly used for creating a square section according to a side length parameter in seepage and drainage pipe parameters, creating a drainage pipe section according to a pipe diameter parameter, then stretching the two sections to two sides along a direction perpendicular to the arrangement direction of the transition section, so as to cut off the boundary of the left side and the right side of the bottom of a embankment below a foundation bed, performing Boolean shearing operation on a generated circular pipe body and a rectangular cylinder, shearing off a part of the circular pipe body overlapped with the rectangular cylinder, deleting the circular pipe body, generating a hollow rectangular cylinder, finally shearing a part of the hollow rectangular cylinder beyond side slopes by using side slope surfaces, deleting the exceeding part, and completing the creation of the seepage and drainage pipe model, wherein a hollow seepage and drainage pipe schematic diagram is shown in fig. 12.
Step 3, model fine modification; after the three-dimensional model is built, a designer can combine the ground model and related interface engineering (bridge, tunnel, station yard and the like) to judge whether the designed transition section meets the requirements. If the transition section needs to be modified, a designer can modify the transition section in a two-dimensional and three-dimensional linkage mode (as shown in fig. 13), and the specific method is as follows: and after the parameters are modified, the two-dimensional longitudinal section graph and the three-dimensional model of the transition section are changed, and specific logic is shown in fig. 14, in a transition section attribute storage module, the point parameters and the transition section attribute parameters are saved, a two-dimensional drawing module acquires the parameters in the attribute storage module to draw the longitudinal section of the transition section, a three-dimensional modeling module acquires the parameters in the attribute storage module to draw the three-dimensional model of the transition section, and the two-dimensional drawing module and the three-dimensional modeling module share one set of data to realize two-dimensional linkage. The linkage updating of the two-dimensional graph and the three-dimensional model can be completed while the transition section data is changed.
According to different transition section types, different attribute packages are designed, and corresponding attribute lists including attribute meanings, attribute names and attribute types are added under the created attribute expansion set. The attribute type represents the storage type of the attribute in the computer, mainly comprising a String (String), an integer type (Int), a double-precision floating point type (double), a boolean type (bol) and the like, and the attribute in the attribute kit is the double-precision floating point type (double), and the attribute name is English in consideration of programming compatibility, as shown in table 1.
TABLE 1 roadbed and bridge transition section attribute table
Step 4, outputting design results; after the transition section is designed, a designer can generate a longitudinal section diagram, a cross section diagram and the number of projects required by the project according to the three-dimensional model, and can also deliver the three-dimensional model to constructors, so that the construction is facilitated. Fig. 15 shows a roadbed and bridge transition section model generated by the method, and the roadbed and transverse structure transition section model and the roadbed and tunnel transition section model are respectively shown in fig. 15, 16 and 17.
Compared with the traditional design method, the method provided by the invention has the advantages that through two-dimensional linkage parameterization design, the vertical section of the transition section is associated with the three-dimensional design viewing port, so that the design of the roadbed transition section is simpler and more convenient. Meanwhile, the problem that the traditional design drawing is not intuitive and inaccurate in showing the detailed structure of the transition section is solved, and by creating a fine model of the transition section, a designer can count the engineering quantity more accurately, and the model can be adjusted by modifying parameters conveniently at any time through the model, so that the design efficiency and accuracy are greatly improved.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (10)

1. The three-dimensional design method of the roadbed transition section is characterized by comprising the following steps of:
generating a three-dimensional model of the roadbed transition section according to the basic data, wherein the three-dimensional model is used for generating a longitudinal section diagram, a cross section diagram and the engineering quantity;
the three-dimensional model generation step comprises the following steps: creating a soil and stone body, dividing the soil and stone body, creating steps, creating a sand-free concrete slab, creating a foundation pit backfill and creating a seepage drainage pipe; the basic data comprise the type of the transition section, the size parameter of the main body part of the transition section, the size parameter of the backfill part of the foundation pit, the size parameter of a pipeline of the transition section for seepage and drainage and the size parameter of a step of excavation of the transition section.
2. The method of claim 1, further comprising creating a profile design viewport and a profile, the profile data comprising lines, a matrix bed, a land line, and a transition, the profile data being used as base data for adjusting the position and size of the transition of the three-dimensional model.
3. A method of three-dimensional design of a roadbed transition zone according to claim 1, wherein the step of creating a body of earth and stone comprises: and creating a foundation bed surface layer and a embankment below a foundation bed at the foundation bed bottom layer according to the line, the ground model and the roadbed design principle data.
4. A method of three-dimensional design of a roadbed transition zone according to claim 3, wherein the step of dividing the earth-rock body comprises: creating a filling edge line according to the distance between the road shoulder and the filling edge and the slope rate of the filling edge line; cutting the roadbed along the arrangement direction of the transition section by using the filling edge line, and respectively cutting the roadbed surface layer and the embankment below the roadbed at the bottom of the roadbed into 3 blocks, wherein the three blocks comprise a left part, a middle part and a right part, so as to generate a cut earth-rock cube.
5. The method of three-dimensional design of a subgrade transition piece according to claim 4, wherein said creating a step comprises:
step base points are arranged on the upper part of the surface layer of the foundation bed at the end point of the transition section, and step lines are built layer by layer downwards from the step base points according to the parameters of the total height of the steps, the step slope rate, the single-stage step height and the width so as to achieve the condition that the total height of the steps is used as a building termination;
and cutting the cut earth and stone body along the arrangement direction perpendicular to the transition section by using the step line to obtain a step-shaped earth and stone body.
6. A method of three-dimensional design of a subgrade transition section as set forth in claim 5, wherein said creating a sand free concrete slab includes the steps of:
setting a base point position of a non-sand concrete plate on the upper part of a base bed surface layer at the starting point of the transition section, generating a plate model at the base point position of the non-sand concrete plate according to the size parameter of the plate, performing Boolean shearing operation on the plate model and the step-shaped earth-rock body, and shearing off the overlapping part of the step-shaped earth-rock body and the plate.
7. The method of three-dimensional design of a subgrade transition section as set forth in claim 6, wherein said creating a foundation pit backfill comprises the steps of:
setting a foundation point of a foundation pit backfill model at the bottom of a step-shaped earth-rock cube at the starting point of the transition section; and creating a backfill body section according to the foundation pit backfill parameters, and then stretching the length of one backfill body along the direction perpendicular to the arrangement direction of the transition section by taking the base point of the foundation pit backfill model as a starting point to generate the foundation pit backfill model.
8. A method of three-dimensional design of a subgrade transition section as set forth in claim 7, wherein said creating a drain pipe comprises the steps of:
a base point of a seepage and drainage pipe model is arranged at the bottom point of the stepped earth and stone body at the starting point of the transition section;
creating a square section according to side length parameters in the seepage and drainage pipe parameters, creating a drainage pipe section according to pipe diameter parameters, then stretching the two sections to two sides along the arrangement direction perpendicular to the transition section by clinging to a ground model, so as to stretch to the slope toe to stop, performing Boolean shearing operation on the generated round pipe body and rectangular cylinder, shearing off the overlapped part of the round pipe body and the rectangular cylinder, deleting the round pipe body, generating a hollow rectangular cylinder, finally shearing the part of the hollow rectangular cylinder beyond the slopes at two sides by using the slope surfaces, deleting the exceeding part, and completing the creation of the seepage and drainage pipe model.
9. A method of three-dimensional design of a subgrade transition section as set forth in any one of claims 1-8, wherein said transition section types include subgrade and bridge transition section, subgrade and transverse structure transition section, and subgrade and tunnel transition section.
10. A three-dimensional design system for a roadbed transition zone comprising at least one processor and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 9.
CN202311098557.9A 2023-08-29 2023-08-29 Three-dimensional design method and system for roadbed transition section Pending CN117171846A (en)

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