Testing device for simulating seepage of wormhole-containing loess sample

Abstract

The utility model discloses a testing device for simulating seepage of a wormhole-containing loess sample. The testing device comprises a water storage tank, a seepage mechanism and a collecting unit, the water storage tank is connected with the seepage mechanism, the seepage mechanism is connected with the collecting unit, a wormhole model is arranged in the seepage mechanism, the shape of the wormhole model is variable, water permeable holes are evenly formed in the wormhole model, and a pressure measuring pipe is installed on the seepage mechanism. The instrument equipment is simple, test materials are easy to obtain, the operation method is popular and easy to understand, the permeability coefficient and the seepage rule of the wormhole-containing loess sample can be obtained only through simple operation calculation, the real seepage condition of the wormhole in the loess body is simulated to a greater extent, and the test efficiency is improved. The precision of the permeability coefficient of the wormhole-containing loess and the convenience of researching the seepage rule of the wormhole-containing loess are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of loess seepage test, in particular to a test device for simulating the seepage of a loess sample containing wormholes. Background Art

[0002] Loess wormholes, as a naturally formed underground hole, are mainly formed by the activities of small animals such as ants, rats, and snakes in the loess layer. These small animals unconsciously leave intricate holes inside the loess in the process of digging nests and looking for food. These wormholes are widely distributed in the loess layer, and their existence has an important impact on the seepage characteristics of loess.

[0003] Seepage is the flow of groundwater in soil or rock, and the seepage characteristics of loess are directly related to many practical application problems. In the loess region, irrigation of farmland, stability of cave dwellings, landslides of mountains, collapse of highway slopes, etc. are closely related to the seepage characteristics of loess. As a special structure inside the loess body, the existence of loess wormholes will change the seepage path of loess. Wormhole seepage is an important factor affecting the stability of farmland, cave dwellings, mountains, and highway slopes. Therefore, exploring a simple, economical, and practical method to obtain the influence of wormholes on loess seepage has high practical significance and economic value.

[0004] At present, the research on seepage in loess pores is mainly focused on large pores such as internal caves, but there is little research on small and widely distributed pores such as wormholes; on the other hand, the research is focused on narrow and long channels such as joints and fissures, but there is little research on the impact of wormholes on the seepage of loess bodies. In addition, the relevant research steps are complicated, the preparation of wormhole samples is difficult, the measured permeability coefficient of loess containing wormholes is low in accuracy, the workload is large, and the cost is high. With the continuous deepening of people's research on wormhole seepage, how to simply and economically obtain the seepage law of loess containing wormholes has become an urgent problem to be solved. Summary of the invention

[0005] The utility model aims to provide a test device for simulating the seepage of a loess sample containing wormholes, and solves the problem of low precision in measuring the permeability coefficient of loess containing wormholes in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A test device for simulating seepage of a loess sample containing wormholes, comprising a water storage tank, a seepage mechanism and a collection unit;

[0008] The water storage tank is connected to a seepage mechanism, the seepage mechanism is connected to a collection unit, a wormhole model is arranged in the seepage mechanism, the shape of the wormhole model is changeable, water-permeable holes are evenly opened on the wormhole model, and a pressure measuring tube is installed on the seepage mechanism.

[0009] Furthermore, a water level port is provided at the top end of the side wall of the water storage tank, and a water outlet is provided at the bottom end of the side wall of the water storage tank.

[0010] Furthermore, the water outlet is connected to the seepage mechanism through a connecting pipe.

[0011] Furthermore, a valve is installed on the connecting pipe.

[0012] Furthermore, the top and bottom of the wormhole model are both provided with permeable stones, and the permeable stones are installed in the seepage mechanism.

[0013] Furthermore, the shapes of the wormhole model include curved, straight and spherical shell shapes.

[0014] Furthermore, the wormhole model is made by 3D printing, and non-woven fabric is pasted on the surface of the wormhole model.

[0015] Furthermore, the seepage mechanism is a columnar tube with a cylindrical upper end and a funnel-shaped lower end, and the collecting unit is arranged below the seepage mechanism.

[0016] Furthermore, the collecting unit comprises a seepage mechanism outlet and a collecting bucket, the seepage mechanism outlet is connected to the seepage mechanism, and the collecting bucket is arranged at the bottom of the seepage mechanism outlet.

[0017] Furthermore, the pressure measuring tube includes a first pressure measuring tube and a second pressure measuring tube, the first pressure measuring tube and the second pressure measuring tube are both installed on the side wall of the seepage mechanism, and the installation position of the first pressure measuring tube is higher than the installation position of the second pressure measuring tube.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model provides a test device for simulating the seepage of a loess sample containing wormholes. By sequentially connecting a water storage tank with a seepage mechanism and a collection unit, wormhole models of different shapes are arranged in the seepage mechanism, and water permeable holes are evenly opened on the wormhole model. Water is injected into the seepage mechanism by using the water storage tank, and the permeability coefficient of the soil body containing wormholes is calculated by recording the pressure difference of the pressure measuring tube and the water flow rate per unit time. The utility model has simple instruments and equipment, easy-to-obtain test materials, easy-to-understand operation methods, green and environmental protection, and good economic benefits. And only through simple operation and calculation, the permeability coefficient and seepage law of the loess sample containing wormholes can be obtained. Compared with the previous method for measuring the permeability coefficient of the loess sample containing wormholes, the utility model simulates the real seepage situation of the wormholes in the loess body to a large extent, and improves the accuracy of the permeability coefficient of the loess containing wormholes and the convenience of studying the seepage law of the loess containing wormholes. It provides a new idea for exploring the seepage law of wormholes inside the loess body, and has good use and promotion value in terms of tools.

[0020] Furthermore, the wormhole model of the utility model is flexible in shape and can simulate the seepage conditions of various real wormhole shapes in loess. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The utility model is a schematic diagram of the structure of the test device for simulating the seepage of loess samples containing wormholes.

[0023] Figure 2 It is a structural schematic diagram of the curved wormhole model of the utility model.

[0024] Figure 3 It is a structural schematic diagram of the straight wormhole model of the utility model.

[0025] Figure 4 It is a structural schematic diagram of the spherical shell wormhole model of the utility model.

[0026] in: Figure 2 (a) is the main view of the curved wormhole model. Figure 2 (b) is a three-dimensional structure diagram of the curved wormhole model; Figure 3 (a) is the main view of the straight wormhole model. Figure 3 (b) is a three-dimensional structure diagram of the straight wormhole model;

[0027] 1- water storage tank, 2- water level port, 3- water outlet, 4- connecting pipe, 5- valve, 6- seepage mechanism, 7- permeable stone, 8- pressure measuring tube, 9- wormhole model, 10- seepage mechanism outlet, 11- collecting tube, 12- permeable hole. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] 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 present invention to be protected, 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.

[0030] 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.

[0031] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does 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 utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The utility model is further described in detail below with reference to the accompanying drawings:

[0035] See also Figure 1 The utility model provides a test device for simulating the seepage of a loess sample containing wormholes, comprising a water storage tank 1, a connecting pipe 4, a seepage mechanism 6, a pressure measuring tube 8, a wormhole model 9 and a collecting unit. The water storage tank 1 is connected to the seepage mechanism 6 through the connecting pipe 4. The seepage mechanism 6 is a columnar tube with a cylindrical upper end and a funnel-shaped lower end. The collecting unit is directly below the seepage mechanism 6, and the seepage mechanism 6 is connected to the collecting unit.

[0036] The top and bottom of the side wall of the water storage tank 1 are both provided with openings, a water level port 2 is provided at the top of the side wall, and a water outlet 3 is provided at the bottom of the side wall. The water storage tank 1 is filled with water, the water level port 2 controls the water level in the water storage tank 1, and the water outlet 3 is used to discharge water. One end of the connecting pipe 4 is connected to the water outlet 3, and the other end of the connecting pipe 4 is connected to the seepage mechanism 6. A valve 5 is provided on the connecting pipe 4 to control the water outlet 3 to flow into the seepage mechanism 6.

[0037] A wormhole model 9 is provided in the seepage mechanism 6, such as Figures 2 to 4 As shown, the morphology of the wormhole model 9 is flexible and can simulate the actual wormhole morphology, including Figure 2 The curves of (a) and (b) in Figure 3 The straight and straight forms of (a) and (b) are Figure 4 The wormhole model 9 is made by 3D printing, and water-permeable holes 12 are evenly opened on the channel of the wormhole model 9 to facilitate water flow in. The surface of the wormhole model 9 is pasted with non-woven fabric, which is pasted to the channel model by glue to prevent soil particles from penetrating into the channel of the wormhole model 9.

[0038] The wormhole model 9 is placed in loess to make a loess sample, and the loess sample is placed in the seepage mechanism 6. Permeable stones 7 are provided on the top and bottom of the loess sample. The permeable stones 7 are installed in the seepage mechanism 6 to allow water to naturally penetrate in the seepage mechanism 6.

[0039] The collecting unit includes a seepage mechanism outlet 10 and a collecting bucket 11. The seepage mechanism outlet 10 is connected to the seepage mechanism 6. The collecting bucket 11 is arranged directly below the bottom of the seepage mechanism outlet 10, so that the water seeping from the seepage mechanism 6 flows into the collecting bucket 11, which is convenient for observing and recording the water output.

[0040] A pressure measuring tube 8 is installed on the seepage mechanism 6, and the pressure measuring tube 8 includes a first pressure measuring tube and a second pressure measuring tube. The first pressure measuring tube and the second pressure measuring tube are both installed on the side wall of the seepage mechanism 6. The installation position of the first pressure measuring tube is higher than the installation position of the second pressure measuring tube, which is used to observe the head pressure difference.

[0041] The test method of the test device for simulating the seepage of a loess sample containing wormholes of the utility model comprises the following steps:

[0042] 1) taking a loess sample containing the wormhole model 9 and recording the morphology and volume information of the wormhole model 9;

[0043] 2) placing the loess sample containing the wormhole model 9 into the seepage mechanism 6, placing the loess sample on the permeable stone 7, and then placing another permeable stone 7 on the top surface of the loess sample;

[0044] 3) Connect the connecting pipe 4 between the water storage tank 1 and the seepage mechanism 6, place the collecting cylinder 11 directly below the seepage device 6, and at this time, the valve 5 on the connecting pipe 4 is in a closed state, fill the water storage tank 1 with water, and keep filling it with water;

[0045] 4) Slowly open the valve 5 to allow water to flow from the outlet 3 in the water storage tank 1 into the seepage mechanism 6. After the water flow at the outlet 10 of the seepage mechanism is stable, replace the collecting tube 11, record the water flow rate per unit time, record the head pressure difference through the pressure measuring tube 8, and then calculate the permeability coefficient and seepage law of the loess sample containing wormholes.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A test device for simulating seepage of loess samples containing wormholes, characterized in that: It comprises a water storage tank (1), a seepage mechanism (6) and a collection unit; The water storage tank (1) is connected to a seepage mechanism (6), the seepage mechanism (6) is connected to a collection unit, a wormhole model (9) is arranged in the seepage mechanism (6), the shape of the wormhole model (9) is changeable, water permeable holes (12) are evenly arranged on the wormhole model (9), and a pressure measuring tube (8) is installed on the seepage mechanism (6).

2. The test device for simulating seepage of loess samples containing wormholes according to claim 1, characterized in that: The top end of the side wall of the water storage tank (1) is provided with a water level port (2), and the bottom end of the side wall of the water storage tank (1) is provided with a water outlet (3).

3. The test device for simulating seepage of loess samples containing wormholes according to claim 2, characterized in that: The water outlet (3) is connected to the seepage mechanism (6) via a connecting pipe (4).

4. The test device for simulating seepage of loess samples containing wormholes according to claim 3, characterized in that: A valve (5) is installed on the connecting pipe (4).

5. The test device for simulating seepage of loess sample containing wormholes according to claim 1, characterized in that: The top and bottom of the wormhole model (9) are both provided with permeable stones (7), and the permeable stones (7) are installed in the seepage mechanism (6).

6. The test device for simulating seepage of loess samples containing wormholes according to claim 1, characterized in that: The shapes of the wormhole model (9) include curved type, straight type and spherical shell type.

7. The test device for simulating seepage of loess samples containing wormholes according to claim 1, characterized in that: The wormhole model (9) is made by 3D printing, and a non-woven fabric is pasted on the surface of the wormhole model (9).

8. The test device for simulating seepage of loess samples containing wormholes according to claim 1, characterized in that: The seepage mechanism (6) is a columnar tube with a cylindrical upper end and a funnel-shaped lower end, and the collection unit is arranged below the seepage mechanism (6).

9. The test device for simulating seepage of loess samples containing wormholes according to claim 1, characterized in that: The collecting unit comprises a seepage mechanism outlet (10) and a collecting bucket (11), wherein the seepage mechanism outlet (10) is connected to the seepage mechanism (6), and the collecting bucket (11) is arranged at the bottom of the seepage mechanism outlet (10).

10. The test device for simulating seepage of loess sample containing wormholes according to claim 1, characterized in that: The pressure measuring tube (8) comprises a first pressure measuring tube and a second pressure measuring tube, wherein the first pressure measuring tube and the second pressure measuring tube are both installed on the side wall of the seepage mechanism (6), and the installation position of the first pressure measuring tube is higher than the installation position of the second pressure measuring tube.

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