Capillary rise process simulation device and method

Abstract

The embodiments of the present invention provide a capillary rise process simulation device and method, which relate to the field of geotechnical engineering construction. The capillary rise process simulation device includes a test assembly, which includes a plurality of capillaries with different pore sizes, the capillaries are made of a bendable sheet, and the capillaries are made of a transparent material. The inner wall of the capillary is evenly covered with fine soil particles to accurately simulate the pore wall characteristics of the soil pores. The capillary rise process simulation method is based on the capillary rise process simulation device, and a capillary rise test is performed through capillaries with different pores. It is found that under a given hydraulic gradient, the water rise height in small pores is higher than the water rise height in large pores. Therefore, the capillary rise process of the soil can be truly simulated through capillaries with different pore sizes, which can accurately reflect the capillary rise of the soil, and then accurately guide engineering practice.

Description

Technical Field

[0001] The invention relates to the field of geotechnical engineering construction, and in particular to a capillary rise process simulation device and method. Background Art

[0002] Capillary phenomenon refers to the process in which water in the soil pores rises under the drive of the matrix potential energy and solute potential energy, and finally reaches a balance with the gravity potential energy. Capillary phenomenon can cause water migration in the soil and cause changes in soil strength. Therefore, it is of great significance to study the factors affecting capillary rise.

[0003] The inventors have found that the capillary rise process of slope soil in the prior art is still not very clear. Currently, the capillary rise test of soil column is mainly used to observe the movement process of water infiltration surface, so as to evaluate the strength of soil capillary action. This method simplifies the pores of soil column into a single pore or into a large number of pores with equal apertures. The device cannot accurately reflect the capillary rise of soil water, and thus it is difficult to accurately guide engineering practice. Summary of the invention

[0004] The objectives of the present invention include, for example, providing a capillary rise process simulation device and method. The capillary rise process simulation method is based on the capillary rise process simulation device. The capillary rise process simulation device includes a test component. The test component includes a plurality of capillaries with different pore sizes. The capillaries are made of a flexible sheet. The inner walls of the capillaries are evenly covered with fine soil particles to accurately simulate the pore wall characteristics of the soil pores. The capillaries are made of transparent materials. Capillary rise tests are carried out using capillaries with different pore sizes. It is found that under a given hydraulic gradient, the water rise height in small pores is higher than the water rise height in large pores. Therefore, the capillary rise process of the soil can be truly simulated using capillaries with different pore sizes, which can accurately reflect the capillary rise of the soil and thus accurately guide engineering practice.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a capillary rise process simulation device, comprising:

[0007] The test assembly includes a plurality of capillaries with different pore sizes. The capillaries are made by curling a bendable surrounding sheet. The inner wall of the capillaries is evenly covered with fine soil particles. The capillaries are made of transparent material.

[0008] In an optional embodiment, the capillary is further provided with a fixing ring, which is sleeved on the outer wall of the capillary to fix the capillary.

[0009] In an alternative embodiment, the fixing ring is made of an elastic material.

[0010] In an optional embodiment, there are multiple fixing rings, and the multiple fixing rings are arranged at intervals along the extension direction of the capillary.

[0011] In an optional embodiment, there are three fixing rings, one of which is sleeved on the middle of the capillary, and the other two fixing rings are sleeved on both ends of the capillary and are equidistant from the fixing ring in the middle.

[0012] In an optional embodiment, the inner wall of the capillary is further coated with a transparent isolation layer.

[0013] In an optional embodiment, the transparent isolation layer is formed by solidifying soft glue.

[0014] In a second aspect, the present invention provides a capillary rise process simulation method, based on the capillary rise process simulation device of any one of the aforementioned embodiments, comprising:

[0015] Place the enclosure flat and evenly spread the soil particles to be tested on the enclosure;

[0016] Curling the surrounding sheet to form a cylindrical capillary;

[0017] Repeat the above steps to prepare multiple capillaries with different pore diameters;

[0018] Capillary rise tests were performed on capillaries with different porosities.

[0019] The beneficial effects of the embodiments of the present invention include, for example: a capillary rise process simulation device provided by the embodiments of the present invention can truly simulate the capillary rise process of soil through capillaries of different pore sizes, can accurately reflect the capillary rise of soil, and then accurately analyze the strength of soil, and then accurately guide engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of a capillary rise process simulation device provided by the first embodiment of the present invention at a first viewing angle;

[0022] Figure 2 for Figure 1 A cross-sectional view of

[0023] Figure 3A schematic structural diagram of the capillary rise process simulation device provided by the first embodiment of the present invention from a second viewing angle;

[0024] Figure 4 A schematic flow chart of the capillary rise process simulation method provided for the second embodiment.

[0025] Icons: 1-capillary rise process simulation device; 10-test component; 11-capillary tube; 111-surrounding sheet; 12-fixing ring; 13-transparent isolation layer; 2-soil particles. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0031] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0032] Capillary phenomenon refers to the process in which water in the soil pores rises under the drive of the matrix potential energy and solute potential energy, and finally reaches a balance with the gravity potential energy. Capillary phenomenon can cause water migration in the soil and cause changes in soil strength. Therefore, it is of great significance to study the factors affecting capillary rise.

[0033] The inventors have found that the capillary rise process of slope soil in the prior art is still not very clear. Currently, the capillary rise test of soil column is mainly used to observe the movement process of water infiltration surface, so as to evaluate the strength of soil capillary action. This method simplifies the pores of soil column into a single pore or into a large number of pores with equal apertures. The device cannot accurately reflect the capillary rise of soil water, and thus it is difficult to accurately guide engineering practice.

[0034] In view of the above problems, the capillary rise process simulation device provided by the present invention includes a test assembly, which includes a plurality of capillaries with different pore sizes. The capillaries are made of a bendable sheet, the inner wall of the capillaries is evenly covered with fine soil particles, and the capillaries are made of a transparent material. The capillary rise process simulation method is based on the capillary rise process simulation device. Through capillary rise tests with capillaries of different pores, it is found that under a given hydraulic gradient, the water rise height in small pores is higher than the water rise height in large pores. Therefore, this method can perform a real simulation of the capillary rise process of soil through capillaries of different pore sizes, which can accurately reflect the capillary rise of soil, and thus accurately guide engineering practice.

[0035] The specific structure of a capillary rise process simulation device provided by an embodiment of the present invention and the corresponding technical effects thereof are described in detail below in conjunction with the accompanying drawings.

[0036] First embodiment:

[0037] Please refer to Figure 1-Figure 3 , a capillary process simulation device provided by an embodiment of the present invention includes a test component 10.

[0038] The test assembly 10 includes a plurality of capillaries 11 with different pore sizes, and the capillaries 11 are made by curling a bendable sheet 111, and the inner wall of the capillaries 11 is evenly covered with soil particles 2. It should be noted that in this embodiment, the soil particles 2 are selected according to the actual conditions of the roadbed slope, earth dam or project, that is, according to the needs of the actual project, the soil particles 2 are selected, and then the capillary rise simulation experiment is carried out through the capillaries 11 with different pores. For details, please refer to Figure 3 In this embodiment, the soil particles 2 do not fill the entire inner space of the capillary 11 , but a layer of soil particles 2 is adhered to the inner wall of the capillary 11 .

[0039] It is easy to understand that in order to facilitate the experimenter to observe the capillary migration process of soil water in the capillary tube 11, the capillary tube 11 in this embodiment is made of a transparent material, that is, the surrounding sheet 111 is made of a transparent material. In this embodiment, the surrounding sheet 111 is made of a transparent PVC material.

[0040] Of course, in some other embodiments, as long as the experimenter can observe the capillary upward migration process of soil water in the capillary 11, it is not limited to the above-mentioned transparent PVC material, and the specific material of the surrounding sheet 111 is not specifically limited here.

[0041] In the existing technology, the movement process of the water infiltration surface is mainly observed through the soil column capillary rise experiment. This method simplifies the soil column pores into a single pore or a large number of pores with the same pore size for the experiment. The inventor has found that through the capillary rise test with capillaries 11 of different pores, it is found that under a given hydraulic gradient, the height of the water rise in the small pores is higher than the height of the water rise in the large pores. Therefore, the device in the prior art cannot reflect the capillary rise of soil water, and it is difficult to analyze the change of soil strength. It is understandable that the pores in the actual soil are mostly different, and it is difficult to accurately guide subsequent engineering practice through the existing device. A capillary rise process simulation device 1 provided by an embodiment of the present invention can perform a real simulation of the capillary rise process of the soil through capillaries 11 of different pore sizes, can accurately reflect the capillary rise of the soil, and then accurately analyze the strength of the soil, and then accurately guide engineering practice.

[0042] Furthermore, in this embodiment, the inner wall of the capillary 11 is also coated with a transparent isolation layer 13, and the transparent isolation layer 13 is formed by solidifying soft glue. It is understandable that since the capillary 11 needs to have a layer of soil particles 2 pasted inside, and since the soil particles 2 cannot be directly fixed on the inner wall of the capillary 11, they need to be fixed with soft glue. It is easy to understand that in order to avoid the isolation layer from obstructing the experimenter's observation of the capillary migration process of soil water in the capillary 11, the isolation layer is a transparent isolation layer 13.

[0043] Furthermore, in this embodiment, the transparent isolation layer 13 is formed by solidifying soft glue, which can be PVC resin or the like. In this embodiment, the specific material of the soft glue is not specifically limited, as long as the soft glue can be solidified and is transparent after solidification.

[0044] It is easy to understand that the capillary 11 provided in this embodiment is made by curling a flexible surrounding sheet 111. After the surrounding sheet 111 is curled to form the capillary 11, the shape of the capillary 11 formed by the curling may be unstable. Therefore, in this embodiment, the capillary 11 is also provided with a fixing ring 12, which is sleeved on the outer wall of the capillary 11 to fix the capillary 11 and prevent the capillary 11 from changing its shape.

[0045] It should be noted that the fixing ring 12 is made of elastic material to fix the shape of the capillary 11 and prevent the shape of the capillary 11 from changing. Of course, in other embodiments, the fixing ring 12 is not limited to being made of elastic material, but can also be made of non-elastic material, as long as it can ensure that the fixing ring 12 can fix the capillary 11 and prevent the capillary 11 from changing in shape, the material of the fixing ring 12 is not specifically limited here. Since there are multiple capillaries 11 with different apertures in this solution, the fixing ring 12 also has multiple, and each fixing ring 12 corresponds to a capillary 11 of a corresponding size, so that the shape of the capillary 11 can be stable.

[0046] In some other embodiments, the number of the fixing rings 12 is multiple, and the multiple fixing rings 12 are arranged at intervals along the extension direction of the capillary 11. It can be immediately that the stability of the capillary 11 is further ensured by multiple fixing rings 12. Specifically, in some other embodiments, the number of the fixing rings 12 is three, one of which is sleeved on the middle of the capillary 11, and the other two are sleeved on both ends of the capillary 11 and are equidistant from the fixing ring 12 in the middle, so as to ensure that the middle and both ends of the capillary 11 are constrained to ensure the stability of the shape of the capillary 11.

[0047] In this embodiment, there is one fixing ring 12, which is sleeved on the capillary 11 and located in the middle of the capillary 11. It is easy to understand that the number of fixing rings 12 on each capillary 11 is not specifically limited, as long as the fixing ring 12 can smoothly fix the shape of the capillary 11 so that the capillary 11 presents a stable tubular structure, the number of fixing rings 12 on each capillary 11 is not specifically limited.

[0048] To sum up, the capillary rise process simulation device 1 provided by the embodiment of the present invention can truly simulate the capillary rise process of soil through capillaries 11 with different pore sizes, accurately reflect the capillary rise of soil, and then accurately analyze the strength of soil, thereby accurately guiding engineering practice.

[0049] Second embodiment:

[0050] Please refer to Figure 4The embodiment of the present invention provides a capillary rise process simulation method based on the capillary rise process simulation device 1 mentioned above. The method comprises:

[0051] S100: Lay the surrounding sheet 111 flat.

[0052] S300: evenly spread the soil particles 2 to be tested on the surrounding sheet 111;

[0053] In this embodiment, before evenly laying the soil particles 2 to be tested on the surrounding sheet 111 , the process further includes S200 : coating soft glue.

[0054] The soft glue is evenly coated on the surrounding sheet 111. It is easy to understand that after the soft glue is coated on the surrounding sheet 111, the soil particles 2 are evenly protruded on the soft glue. After the soft glue solidifies, a transparent isolation layer 13 is formed.

[0055] S400: Curling the surrounding sheet 111 to make a capillary 11, and repeating the above steps to make a plurality of capillaries 11 with different pores.

[0056] Then the surrounding sheet 111 is rolled up to form a columnar capillary 11;

[0057] Repeat the above steps to prepare a plurality of capillaries 11 with different pore sizes;

[0058] S500: performing capillary rise tests on the capillaries 11 with different pores respectively.

[0059] It should be noted that the pore size and length of the capillary 11 in this embodiment are determined according to the pore structure of the simulated soil.

[0060] In summary, the embodiment of the present invention provides a method for simulating a capillary rise process, by making a plurality of capillaries 11 with different pores through a surrounding sheet 111, and then using a plurality of different capillaries 11 to perform a capillary rise test, the process and rise height of capillary rise of different pores can be clearly observed. The capillary rise process simulation method provided by a capillary rise process simulation device 1 of the embodiment of the present invention can perform a true simulation of the capillary rise process of the soil through the capillaries 11 with different pore sizes, can accurately reflect the capillary rise of the soil, and then accurately analyze the strength of the soil, and then accurately guide engineering practice.

[0061] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A capillary rise process simulation method, based on a capillary rise process simulation device, characterized in that: The capillary rise process simulation device comprises a test assembly, wherein the test assembly comprises a plurality of capillaries with different pore sizes, wherein the capillaries are made by curling a bendable surrounding sheet, wherein the inner wall of the capillary is evenly covered with fine soil particles, and wherein the capillary is made of a transparent material; The method comprises: Place the enclosure sheet flat and evenly spread the soil particles to be tested on the enclosure sheet; Curling the surrounding sheet to form a cylindrical capillary; Repeat the above steps to prepare multiple capillaries with different pore sizes; Conducting a capillary rise test on the capillaries of different pores; The pore size and length of the capillary are determined according to the pore structure of the simulated soil.

2. The capillary rise process simulation method according to claim 1, characterized in that: The capillary is also provided with a fixing ring, which is sleeved on the outer side wall of the capillary and is used to fix the capillary.

3. The capillary rise process simulation method according to claim 2, characterized in that: The fixing ring is made of elastic material.

4. The capillary rise process simulation method according to claim 2, characterized in that: There are multiple fixing rings, and the multiple fixing rings are arranged at intervals along the extending direction of the capillary.

5. The capillary rise process simulation method according to claim 4, characterized in that: There are three fixing rings, one of which is sleeved on the middle of the capillary, and the other two fixing rings are sleeved on both ends of the capillary respectively and are equidistant from the fixing ring in the middle.

6. The capillary rise process simulation method according to claim 1, characterized in that: The inner wall of the capillary is also coated with a transparent isolation layer.

7. The capillary rise process simulation method according to claim 6, characterized in that: The transparent isolation layer is formed by solidifying soft glue.

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