Device for testing moisture migration and humidity increase and decrease of undisturbed sample

Abstract

The utility model discloses an undisturbed sample moisture migration and humidity increasing and decreasing testing device which comprises a constant temperature and humidity chamber and an external rotating stand, the external rotating stand is located in the constant temperature and humidity chamber, an internal rotating stand is arranged in the external rotating stand, three valves are arranged in the internal rotating stand, and the three valves are connected with the internal rotating stand. A supporting rod penetrating through the internal rotating stand and the external rotating stand is arranged on the three-valve, and a needle type moisture probe is arranged on the three-valve. When the device is used for testing the moisture migration and moisture increasing and decreasing processes of the undisturbed sample, the sample is rotated through the angle controller to achieve the purpose of uniform moisture distribution, the large test result deviation caused by non-uniform moisture distribution in the rainfall test process is overcome, and the subsequent data analysis is more accurate and reliable; the powerful support is provided for the exploration of the water migration rule of the undisturbed sample.

Description

Technical Field

[0001] This utility model relates to the field of moisture migration and humidity increase / decrease testing technology, specifically, to a device for testing moisture migration and humidity increase / decrease of undisturbed samples. Background Technology

[0002] In recent years, extreme weather events have become more frequent, with many areas experiencing either perennial drought or rainfall. This has significantly increased the probability of geological disasters due to rainwater infiltration in some regions. In arid and semi-arid areas, including plateaus and desertified regions, soil moisture migration generates hydraulic interactions, leading to slope instability, severe soil erosion, and increasingly infertile land. Currently, indoor simulated rainfall experiments are used to investigate soil moisture migration. However, these devices suffer from uneven rainfall distribution and cannot simulate the gravity of soil under natural conditions, thus failing to accurately explore the intrinsic mechanisms and patterns of moisture migration within soil pores. To investigate the migration patterns of water in soil pores and how soil moisture changes with environmental climate, indoor simulation experiments can be conducted using a water migration and humidification / dehumidification testing device. The humidification process explores the relationship between geological disasters and the process and rate of water infiltration, clarifying the water diffusion patterns, which plays a role in understanding and analyzing disasters. The dehumidification process investigates the difficulty of vegetation recovery in arid and semi-arid regions due to rainfall being far less than water evaporation, and the impact of agricultural irrigation on soil water migration. It aims to restore vegetation and reduce unnecessary water loss by replenishing water supply. In a sealed environment, undisturbed samples are humidified or dehumidified using water replenishment capillaries. A centrifuge device provides a pseudo-gravity field to simulate the uniform distribution of water under natural conditions, and the soil moisture content is monitored in real time. This reveals that water migration in soil pores is one of the core factors inducing slope instability, providing governance principles and technical solutions for slope instability and soil erosion control in areas with concentrated rock and soil distribution. Therefore, there is an urgent need to develop a device that can simulate the migration of water in soil pores under natural rainfall, temperature, and humidity conditions. The core principle of this device is that water always migrates from areas of high relative humidity to areas of low relative humidity. This device can not only simulate the change in soil moisture content and the migration patterns under uniform rainfall conditions, but also takes into account the effects of gravity, temperature, humidity, and wind on the soil under natural conditions. To ensure a more uniform distribution of moisture within the sample, a centrifuge is installed inside the device to rotate the sample. Centrifugal acceleration provides a pseudo-gravity field to simulate the gravity of a natural slope, making the experimental results more realistic and reliable. This device has a wide range of applications, allowing for realistic simulation experiments on sandstone slopes in the Ordos Plateau of Inner Mongolia, loess slopes in north-central my country, black soil slopes in Northeast China, and saline soils in arid and semi-arid inland areas of my country. It provides experimental evidence and directions for the treatment of soil erosion caused by slope instability in my country, laying a theoretical foundation for slope stabilization and other protective work.

[0003] There are currently no effective solutions to the problems in the relevant technologies. Utility Model Content

[0004] In view of the problems in the related technologies, this utility model proposes an undisturbed sample moisture migration and humidity increase / decrease testing device to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] Therefore, the specific technical solution adopted by this utility model is as follows:

[0006] A device for testing the moisture migration and humidity increase / decrease of an undisturbed sample includes a constant temperature and humidity chamber and an external rotating frame. The external rotating frame is located inside the constant temperature and humidity chamber. An internal rotating frame is provided inside the external rotating frame. A three-lobed membrane is provided inside the internal rotating frame. A support rod passing through the internal rotating frame and the external rotating frame is provided on the three-lobed membrane, and a needle-type moisture probe is provided on the three-lobed membrane.

[0007] Preferably, the three-lobe membrane is composed of three arc-shaped plates that are completely aligned into a cylinder, with the needle-type moisture probes located on two of the lobes in symmetrical positions.

[0008] Preferably, the top of the three-valve membrane is provided with a sample cover plate, and the sample cover plate has a number of evenly distributed water replenishment capillary pores.

[0009] Preferably, the external rotating frame is equipped with a moisture supply controller, which is connected to the moisture supply capillary through a water supply capillary tube.

[0010] Preferably, the three valves contain a sample, which is a cylindrical sample with dimensions of 39.1mm*80mm, 50mm*100mm, 70mm*140mm, and 100mm*200mm.

[0011] Preferably, the external rotating frame is equipped with a centrifugal controller, and the bottom of the external rotating frame is equipped with an angle controller and a data acquisition control terminal.

[0012] The beneficial effects of this invention are as follows: When testing the moisture migration and humidity increase / decrease process of undisturbed samples using this invention, the angle controller rotates the sample to achieve uniform moisture distribution, overcoming the large deviation in test results caused by uneven moisture distribution during rainfall tests. This makes subsequent data analysis more accurate and reliable, providing strong support for exploring the moisture migration law of undisturbed samples. The centrifuge controller provides centrifugal acceleration to the sample to form a pseudo-gravity field, ensuring that the moisture distribution in the left and right directions inside the sample is the same as that of soil under natural conditions. At the same time, it can simulate the self-gravity generated at different heights inside the soil under real conditions, making the test results closer to reality and considering the real migration process of moisture under gravity. The blower simulates wind in the natural environment, and the external constant temperature and humidity chamber provides the temperature and humidity required for the test, maximizing the restoration of real environmental conditions. By setting a sample cover plate with water replenishment capillary pores, moisture is evenly permeated into the sample, preventing uneven moisture migration from damaging the sample and ensuring maximum uniform diffusion and extension. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of an undisturbed sample moisture migration and humidity increase / decrease testing device according to an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the sample cover plate in an undisturbed sample moisture migration and humidity increase / decrease testing device according to an embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of a three-lobe membrane in an undisturbed sample moisture migration and humidity increase / decrease testing device according to an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of an external rotating frame in a test device for moisture migration and humidity increase / decrease of an undisturbed sample according to an embodiment of the present invention.

[0018] In the picture:

[0019] 1. Constant temperature and humidity chamber; 2. External rotating frame; 3. Internal rotating frame; 4. Three-valve membrane; 5. Support rod; 6. Needle-type moisture probe; 7. Sample cover plate; 8. Water supply capillary; 9. Moisture supply controller; 10. Water supply capillary tube; 11. Sample; 12. Centrifuge controller; 13. Angle controller; 14. Data acquisition and control terminal. Detailed Implementation

[0020] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0021] According to an embodiment of the present invention, a device for testing the moisture migration and humidity increase / decrease of undisturbed samples is provided.

[0022] Example 1;

[0023] like Figure 1-4 As shown, the original sample moisture migration and humidity increase / decrease test device according to the embodiment of the present utility model includes a constant temperature and humidity chamber 1 and an external rotating frame 2. The external rotating frame 2 is located inside the constant temperature and humidity chamber 1. An internal rotating frame 3 is provided inside the external rotating frame 2. A three-valve membrane 4 is provided inside the internal rotating frame 3. A support rod 5 passing through the internal rotating frame 3 and the external rotating frame 2 is provided on the three-valve membrane 4, and a needle-type moisture probe 6 is provided on the three-valve membrane 4.

[0024] Example 2;

[0025] like Figure 1-4 As shown, the three-lobe membrane 4 is composed of three arc-shaped plates that are completely aligned into a cylinder. The needle-type moisture probe 6 is provided on two of the lobes in symmetrical positions. The top of the three-lobe membrane 4 is provided with a sample cover plate 7. The sample cover plate 7 has several evenly distributed water replenishment capillary holes 8. The external rotating frame 2 is provided with a moisture replenishment controller 9. The moisture replenishment controller 9 is connected to the water replenishment capillary holes 8 through a water replenishment capillary tube 10.

[0026] Example 3;

[0027] like Figure 1-4 As shown, the three-valve membrane 4 contains a sample 11, which is a cylindrical sample with dimensions of 39.1mm*80mm, 50mm*100mm, 70mm*140mm, and 100mm*200mm. The external rotating frame 2 is equipped with a centrifugal controller 12, and the bottom of the external rotating frame 2 is equipped with an angle controller 13 and a data acquisition control terminal 14.

[0028] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0029] In practical applications, taking a 50mm*100mm arsenic sandstone sample as an example, a preliminary test is conducted to determine the amount of water required to humidify the sample to the required test conditions and the time required to achieve uniform moisture distribution within the sample. Then, a formal test is performed on the same sample. The constant temperature and humidity chamber 1 is used to set the ambient temperature and humidity to meet the test conditions, and the test apparatus is kept in a sealed environment. At the start of the humidification test, the data acquisition and control terminal 14 controls the water supply controller 9 to supply the water determined in the preliminary test to the sample 11 through the water supply capillary pore 8 connected by the water supply capillary tube 10. Simultaneously, the data acquisition and control terminal 14 controls the blower at the opening of the sample cover plate 7 to apply the required airflow. At the same time, the data acquisition and control terminal 14 controls the centrifuge controller 12 to apply the rotational speed set in the preliminary test to the sample, simulating the self-weight generated at different heights within the soil. During the water replenishment process, the moisture content of the sample is monitored in real time using a needle-type moisture probe 6. The water replenishment time is obtained from the pre-test. After a period of water replenishment, the sample is reversed by controlling the angle sensor 13 via a motor. The moisture replenishment controller valve is closed, and the sample is left to stand for a period of time. The data collected by the needle-type moisture probe 6 is then observed. If the moisture content data detected by the needle-type moisture probe 6 in all directions of the sample meets the required test conditions and is equal, the sample can be considered to have uniform internal moisture distribution. If the moisture content in all directions of the sample is the same but has not yet reached the required test conditions, the moisture replenishment controller valve is opened to continue water replenishment while the needle-type moisture probe data is monitored in real time. This process is repeated until the needle-type moisture probe values ​​at all points of the sample meet the test requirements, at which point the humidification process is complete. For the dehumidification test, the constant temperature and humidity chamber is first set to a higher temperature to allow the moisture inside the sample to evaporate. The test does not require the use of a data acquisition control terminal to control the moisture replenishment controller 9 for water replenishment. All other operations are the same as in the humidification process. When the moisture content data detected by the needle-type moisture probe 6 at all points of the sample meets the required test conditions and is equal, the sample is considered to have uniform internal moisture distribution, at which point the dehumidification process is complete.

[0030] In summary, by utilizing the above-mentioned technical solutions of this utility model, when testing the moisture migration and humidity increase / decrease process of undisturbed samples, the angle controller 13 rotates the sample to achieve uniform moisture distribution, overcoming the large deviation in test results caused by uneven moisture distribution during rainfall tests, making subsequent data analysis more accurate and reliable, and providing strong support for exploring the moisture migration law of undisturbed samples; the centrifuge controller 14 provides centrifugal acceleration to the sample to form a pseudo-gravity field, so that the moisture distribution in the left and right directions inside the sample is the same as that of soil under natural conditions, and at the same time, it can simulate the self-gravity generated at different heights inside the soil under real conditions, making the test results closer to reality and considering the real migration process of moisture under gravity; the blower simulates the wind in the natural environment, and the external constant temperature and humidity chamber 1 provides the temperature and humidity required for the test, restoring the real environmental conditions as much as possible; by setting a sample cover plate 7 with water replenishment capillary holes 8, moisture is evenly penetrated into the sample, preventing uneven moisture migration from damaging the sample and ensuring maximum uniform diffusion and extension.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for testing the moisture migration and humidity increase / decrease of an undisturbed sample, characterized in that, It includes a constant temperature and humidity chamber (1) and an external rotating frame (2). The external rotating frame (2) is located inside the constant temperature and humidity chamber (1). An internal rotating frame (3) is provided inside the external rotating frame (2). A three-valve membrane (4) is provided inside the internal rotating frame (3). A support rod (5) is provided on the three-valve membrane (4) that passes through the internal rotating frame (3) and the external rotating frame (2). A needle-type moisture probe (6) is provided on the three-valve membrane (4).

2. The device for testing the moisture migration and humidity increase / decrease of an undisturbed sample according to claim 1, characterized in that, The three-lobe membrane (4) is composed of three arc-shaped plates that are completely aligned into a cylinder, with the needle-type moisture probe (6) located on two of the symmetrical lobes.

3. The device for testing the moisture migration and humidity increase / decrease of an undisturbed sample according to claim 1, characterized in that, The top of the three-valve membrane (4) is provided with a sample cover plate (7), and the sample cover plate (7) is provided with a number of uniformly distributed water replenishment capillary pores (8).

4. The device for testing the moisture migration and humidity increase / decrease of an undisturbed sample according to claim 3, characterized in that, The external rotating frame (2) is equipped with a water supply controller (9), which is connected to the water supply capillary (8) through a water supply capillary tube (10).

5. The device for testing the moisture migration and humidity increase / decrease of an undisturbed sample according to claim 1, characterized in that, The three-valve membrane (4) contains a sample (11), which is a cylindrical sample with dimensions of 39.1mm*80mm, 50mm*100mm, 70mm*140mm, and 100mm*200mm.

6. The device for testing the moisture migration and humidity increase / decrease of an undisturbed sample according to claim 1, characterized in that, The external rotating frame (2) is equipped with a centrifugal controller (12), and the bottom of the external rotating frame (2) is equipped with an angle controller (13) and a data acquisition control terminal (14).

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