Numerical simulation method, system, equipment and medium for influence of concrete panel microcracks on panel leakage characteristics

Abstract

The invention provides a numerical simulation method, a numerical simulation system, numerical simulation equipment and a numerical simulation medium for influence of concrete panel microcracks on panel leakage characteristics. The numerical simulation method comprises the following steps: S1, establishing a concrete panel grid; s2, crack information is generated; s3, traversing the grid units of the concrete panel, counting the number of cracks in each grid unit according to the coordinates and depth of the cracks, and recording the corresponding width of the cracks; s4, updating the permeability coefficient of the grid unit of the concrete panel; and S5, carrying out seepage calculation. According to the method, direct modeling of millimeter-level cracks on a hectometer-level panel is avoided, and the modeling difficulty is reduced; a formula for quantifying the permeability coefficient of the fracture-containing panel grid unit is given, so that the calculation precision is greatly improved; the influence of the crack width and depth on the permeability coefficient of the panel is considered, and an important foundation is laid for subsequent concrete anti-cracking and anti-seepage research work.

Description

Technical Field

[0001] The present invention relates to a numerical simulation method, system, device and medium for the influence of microcracks in a concrete face slab on the leakage characteristics of the face slab. Background Art

[0002] Concrete face rockfill dams have the advantages of good anti-sliding stability, convenient construction, outstanding economy, etc., and are common dam types in the hydropower industry in China. During the operation of the dam, the concrete face slab will shrink due to environmental factors such as temperature and humidity, and induce tensile stress under the action of foundation constraints, generating regular horizontal cracks. These horizontal cracks are generally less than 0.2 m, and mainly about 0.1 mm, and a few can reach 0.5 mm. According to the "Hydraulic Design Manual", during the inspection of the Tian Shengqiao I Hydropower Station in 2002, as many as 4,537 horizontal cracks were found, and the widths of the vast majority of the cracks were less than 0.3 mm. These horizontal cracks reduce the anti-seepage ability of the face slab and are one of the reasons for the frequent occurrence of leakage problems in the face slab dam during the operation period. Carrying out research on the influence of microcracks on the leakage of the face rockfill dam has important practical significance for aspects such as the design optimization of the face slab dam, the inversion of the seepage field, and the danger removal and reinforcement of the dam.

[0003] With the progress of numerical calculation methods, scholars and engineers have studied the seepage field of the face slab dam under different crack conditions and subsequent stability calculations through geotechnical calculation software. In the simulation of face slab cracks, usually the permeability coefficient of the face slab area is directly enhanced, that is, a larger permeability coefficient is roughly assigned to the face slab area containing cracks. Or, some face slab grids are directly deleted, and the water head is directly applied to areas such as the cushion zone. Directly modeling millimeter-scale cracks in a face slab dam model dozens of meters or even hundreds of meters high affects its efficiency both in grid division and subsequent calculations.

[0004] For face slab cracks, the existing methods cannot accurately simulate their influence on the permeability of the face slab, and usually roughly estimate the influence of cracks on the anti-seepage effect of the face slab. For example, there is no quantitative standard for the value of the permeability coefficient of the face slab containing cracks, and the relationship between elements such as grid size and the characteristics of cracks such as the number, depth, and width cannot be established.

[0005] When calculating the seepage field of the face rockfill dam, the inventor found that it is difficult to determine the permeability coefficient of the face slab containing cracks, and the reasons are as follows: (1) It is difficult to establish a crack model less than 1 mm on a face slab hundreds of meters high, which is not conducive to subsequent grid division and calculation convergence; (2) Directly increasing the permeability coefficient of the face slab containing cracks cannot establish a relationship with the number and width of cracks, and it is impossible to evaluate the influence of crack characteristics on seepage under different distribution conditions. Summary of the Invention

[0006] The first object of the present invention is to provide a numerical simulation method for the influence of micro-cracks in a concrete panel on the leakage characteristics of the panel.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A numerical simulation method for the influence of micro-cracks in a concrete panel on the leakage characteristics of the panel, comprising the following steps:

[0009] S1. Establish a concrete panel grid;

[0010] S2. Generate crack information;

[0011] S3. Traverse the concrete panel grid elements, and count the number of cracks in each grid element according to the coordinates and depths of the cracks, and record the corresponding widths of the contained cracks;

[0012] S4. Update the permeability coefficient of the concrete panel grid elements;

[0013] S5. Conduct seepage calculation.

[0014] While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:

[0015] As a preferred technical solution of the present invention: Step S1 specifically includes the following process:

[0016] The concrete panel grid is composed of N×H rectangular grids, where N is the number of grids divided in the vertical direction, H is the number of grid layers divided in the thickness direction of the concrete panel, and the initial permeability coefficient of the concrete panel grid element is k c 。

[0017] As a preferred technical solution of the present invention: In step S1, the number of grid layers H divided in the thickness direction of the concrete panel grid is not less than 2.

[0018] As a preferred technical solution of the present invention: In step S2, the crack information includes the coordinates, widths and depths of each crack.

[0019] As a preferred technical solution of the present invention: In step S4, the calculation formula for the permeability coefficient k of the concrete panel grid element is:

[0020]

[0021] In the above formula, L is the length of the concrete grid element on the water-facing side, a is the width of the micro-crack, g is the acceleration due to gravity, ν is the kinematic viscosity of the fluid, J is the total number of cracks in the grid element, j represents the jth crack, j = 1,..., J; k cis the initial permeability coefficient of the concrete panel grid element.

[0022] The second object of the present invention is to provide a numerical simulation system for the influence of microcracks in a concrete panel on the leakage characteristics of the panel.

[0023] To this end, the above object of the present invention is achieved by the following technical solutions:

[0024] A numerical simulation system for the influence of microcracks in a concrete panel on the leakage characteristics of the panel, comprising the following modules:

[0025] - A concrete panel grid establishment module, which is used to establish a concrete panel grid;

[0026] - A crack information generation module, which is used to generate crack information;

[0027] - A concrete panel grid element traversal module, which is used to traverse the concrete panel grid elements, count the number of cracks contained in each grid element according to the coordinates and depths of the cracks, and record the corresponding widths of the contained cracks;

[0028] - A permeability coefficient update module for concrete panel grid elements, which is used to update the permeability coefficient of the concrete panel grid elements;

[0029] - A seepage calculation module, which is used to perform seepage calculations.

[0030] The third object of the present invention is to provide an electronic device, which includes a processor, a communication interface, a memory, and a communication bus. The processor, communication interface, and memory communicate with each other through the communication bus. The characteristics are as follows:

[0031] Memory, which is used to store computer programs;

[0032] A processor, which is used to execute the computer programs stored on the memory to implement the steps of the numerical simulation method for the influence of microcracks in a concrete panel on the leakage characteristics of the panel as described above.

[0033] Another object of the present invention is to provide a non-transitory readable storage medium, the characteristics of which are that the non-transitory readable storage medium stores a program, and when the program is executed by a processor, it implements the steps of the numerical simulation method for the influence of microcracks in a concrete panel on the leakage characteristics of the panel as described above.

[0034] The present invention provides a numerical simulation method, system, device and medium for the influence of micro-cracks in concrete slabs on the leakage characteristics of the slabs. Aiming at the difficulty of determining the permeability coefficient of cracked slabs, an equivalent permeability coefficient of grid units of cracked slabs is first established, correlating the grid size, crack width and crack number, and realizing the evaluation of the leakage of the slab dam due to crack width and number on the basis of avoiding direct modeling of millimeter-scale cracks.

[0035] Specifically, compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) It avoids direct modeling of millimeter-scale cracks on a slab hundreds of meters long, reducing the difficulty of modeling;

[0037] (2) It gives a formula for quantifying the permeability coefficient of grid units of cracked slabs, greatly improving the calculation accuracy;

[0038] (3) It considers the influence of crack width and depth on the permeability coefficient of the slab, laying an important foundation for subsequent research on concrete crack prevention and seepage prevention. Description of the Drawings

[0039] Figure 1 It is a typical sectional view of a concrete face rockfill dam.

[0040] Figure 2 It is a numerical model diagram.

[0041] Figure 3 It is the intersection of each slab grid and the cracks.

[0042] Figure 4 It is the updated permeability coefficient of the slab grid at elevations of 412.4m - 445m.

[0043] Figure 5 It is the head distribution after seepage calculation. Detailed Implementation Modes

[0044] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0045] The structural schematic diagram of the concrete face rockfill dam is as Figure 1 shown, with a maximum dam height of 102.4m (elevation 347m - 449.4m), a normal storage water level of 445m, and the permeability coefficient of the crack-free concrete slab being 1×10 9 m / s. In this embodiment, a total of 100 micro-cracks are considered, randomly distributed between elevations 412.4m - 445m of the slab, with a width of 0.1mm each. The thickness of the concrete slab is 0.4m, and the crack depth is randomly distributed within the range of 0 - 0.4m.

[0046] Modeling is carried out in the geotechnical numerical calculation software FLAC2D 9.1, as Figure 2 shown. The concrete face slab has a total of 410 grid elements, and within the elevation area where the crack is located, there are a total of 54×3 grid elements. Use the fish language of FLAC2D 9.1 to generate the elevation coordinates and depths of the cracks, traverse each face slab grid element, and calculate the intersection situation between the cracks and the grid elements, as Figure 3 shown. According to the number of intersections, the crack width, and the size of the grid, substitute them into the calculation formula of the permeability coefficient k of the concrete face slab grid element to update the permeability coefficient of the grid element. The updated permeability coefficient of the face slab grid element is as Figure 4 shown.

[0047] Carry out seepage calculation according to the updated face slab permeability coefficient. The water head distribution is as Figure 5 shown.

[0048] The present invention also provides a numerical simulation system for the influence of micro-cracks in a concrete face slab on the leakage characteristics of the face slab, including the following modules:

[0049] - Concrete face slab grid establishment module, which is used to establish the concrete face slab grid;

[0050] - Crack information generation module, which is used to generate crack information;

[0051] - Concrete face slab grid element traversal module, which is used to traverse the concrete face slab grid elements, count the number of cracks in each grid element according to the coordinates and depths of the cracks, and record the corresponding widths of the contained cracks;

[0052] - Permeability coefficient update module of the concrete face slab grid element, which is used to update the permeability coefficient of the concrete face slab grid element;

[0053] - Seepage calculation module, which is used to carry out seepage calculation.

[0054] The present invention also provides an electronic device, which includes a processor, a communication interface, a memory, and a communication bus. The processor, communication interface, and memory complete mutual communication through the communication bus. It is characterized in that

[0055] Memory, which is used to store computer programs;

[0056] Processor, which is used to execute the computer programs stored on the memory to implement the steps of the numerical simulation method for the influence of micro-cracks in a concrete face slab on the leakage characteristics of the face slab as described above.

[0057] The present invention also provides a non-transitory readable storage medium, characterized in that a program is stored in the non-transitory readable storage medium, and when the program is executed by a processor, the steps of the numerical simulation method for the influence of micro-cracks in a concrete panel on the leakage characteristics of the panel as described above are realized.

[0058] The above specific embodiments are used to explain the present invention, and are only the preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and scope of the protection of the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A numerical simulation method for the influence of concrete panel microcracks on panel leakage characteristics, characterized by: The steps include: S1. Establish concrete panel grid; S2, generating crack information; S3, traversing the grid units of the concrete panel, counting the number of cracks in each grid unit according to the coordinates and depths of the cracks, and recording the corresponding widths of the cracks; S4, updating the permeability coefficient of the concrete panel grid unit; S5. Perform seepage calculation.

2. The numerical simulation method according to claim 1, characterized in that: Step S1 specifically includes the following process: The concrete panel grid consists of N×H rectangular grids, where N is the number of grids divided in the vertical direction, H is the number of grid layers divided in the thickness direction of the concrete panel, and the initial permeability coefficient of the concrete panel grid unit is k c .

3. The numerical simulation method according to claim 2, characterized in that: In step S1, the number of grid layers H into which the concrete panel grid is divided in the thickness direction is not less than 2.

4. The numerical simulation method according to claim 1, characterized in that: In step S2, the crack information includes the coordinates, width and depth of each crack.

5. The numerical simulation method according to claim 1, characterized in that: In step S4, the calculation formula of the permeability coefficient k of the concrete panel grid unit is: In the above formula, L is the length of the concrete grid unit on the water-facing surface, a is the width of the microcrack, g is the gravitational acceleration, ν is the kinematic viscosity of the fluid, J is the total number of cracks in the grid unit, j represents the jth crack, j = 1, ..., J; k c is the initial permeability coefficient of the concrete panel mesh element.

6. A numerical simulation system for the effect of concrete panel microcracks on panel leakage characteristics, characterized by: Includes the following modules: - a concrete panel mesh building module, the concrete panel mesh building module is used to build a concrete panel mesh; - a crack information generation module, the crack information generation module is used to generate crack information; - A concrete panel grid unit traversal module, which is used to traverse the concrete panel grid units, count the number of cracks in each grid unit according to the coordinates and depth of the cracks, and record the corresponding widths of the cracks; - a permeability coefficient updating module of a concrete panel grid unit, wherein the permeability coefficient updating module of a concrete panel grid unit is used to update the permeability coefficient of the concrete panel grid unit; - A seepage calculation module, wherein the seepage calculation module is used to perform seepage calculation.

7. An electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus, characterized in that: A memory, the memory being used to store a computer program; A processor, wherein the processor is used to execute a computer program stored in a memory to implement the steps of a numerical simulation method for the influence of microcracks in a concrete panel on the leakage characteristics of the panel as described in any one of claims 1 to 5.

8. A non-transitory readable storage medium, characterized in that: The non-transitory readable storage medium stores a program, and when the program is executed by the processor, the program implements the steps of the numerical simulation method for the influence of micro cracks in concrete panels on the leakage characteristics of the panels as described in any one of claims 1 to 5.

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