Experimental equipment for soil frost heaving

Abstract

The utility model relates to experimental equipment for soil frost heaving, which comprises an equipment main body, a cylinder body which is arranged on the equipment main body and is used for installing a soil sample, a low-temperature circulating pump, a regulating valve and a heating element, a cold-end temperature control disc and a hot-end temperature control disc are respectively arranged at two ends of the cylinder body, and the heating element is arranged on the hot-end temperature control disc. The low-temperature circulating pump is provided with a circulating pipeline used for conveying a cold working medium, and the circulating pipeline is sequentially connected with the cold end temperature control disc and the hot end temperature control disc. The adjusting valve is arranged on the circulating pipeline, and the equipment body is provided with a sensing assembly. According to the utility model, the low-temperature circulating pump, the regulating valve, the heating element and the sensing component work cooperatively, so that the temperature, the pressure and the humidity of the soil sample can be accurately controlled, the real-time monitoring function is realized, and the heating element can operate to transmit the temperature to a cold working medium of a circulating pipeline through the hot-end temperature control disc, so that the temperature of the cold working medium is increased and maintained; and the temperature stability in the experiment process is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical experiments, and more particularly to an experimental device for soil frost heave. Background Art

[0002] Studying the frost heave characteristics of soils in low-temperature environments is crucial in the field of geotechnical testing. This phenomenon has a wide-ranging impact on civil engineering, geological engineering, and environmental engineering. Frost heave, for example, is closely related to foundation settlement, road damage, and slope instability. Therefore, accurately simulating and studying the frost heave process is crucial for predicting and preventing these engineering problems.

[0003] Currently, a transparent tank soil frost heave observation device (patent CN208283321U) uses a transparent tank with two open ends, connected by a removable fixture to the upper and lower plates, allowing for easy removal of soil samples after the experiment. This device makes observing the soil frost heave process intuitive, facilitating teaching and research. However, its primary purpose is observation rather than quantitative analysis, resulting in poor data accuracy in soil frost heave experiments.

[0004] The coupled visualization experimental device for soil frost heave and water-heat migration (patent CN109884111A) allows for simultaneous study of soil frost heave and water-heat migration, providing real-time monitoring of soil particle properties. This device increases experimental information, but it is complex and requires stringent operation and maintenance.

[0005] In view of this, it is indeed necessary to provide a technical solution to the above problems. Utility Model Content

[0006] The technical problem to be solved by the present invention is to provide an experimental device for soil frost heave in view of the above-mentioned defects of the prior art.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] An experimental device for soil frost heave is constructed, comprising an equipment main body, a cylinder installed on the equipment main body and used to install a soil sample, a low-temperature circulation pump, a regulating valve and a heating element. A cold-end temperature control disk and a hot-end temperature control disk are respectively installed at both ends of the cylinder, and the heating element is arranged on the hot-end temperature control disk. The low-temperature circulation pump has a circulation pipeline for conveying a cold working medium, and the circulation pipeline is connected to the cold-end temperature control disk and the hot-end temperature control disk in sequence to control the temperature of the soil sample in the cylinder; the regulating valve is arranged on the circulation pipeline to control the flow of the cold working medium; the equipment main body is provided with a sensing component for real-time monitoring of the temperature change, pressure change and volume change of the soil sample during the experiment.

[0009] As an improvement to the experimental equipment for soil frost heave, it further includes a pressure component that can be operated to squeeze the soil sample in the cylinder to apply pressure to the soil sample.

[0010] As an improvement to the experimental equipment for soil frost heave, the pressure assembly includes a cylinder body arranged on the main body of the equipment, a connecting pipe for connecting to a pressure source and communicating with the cylinder body, and a piston movably arranged in the cylinder body. The connecting pipe transports the fluid provided by the pressure source to the cylinder body to drive the piston to move and squeeze the soil sample in the cylinder body.

[0011] As an improvement to the experimental equipment for soil frost heave, the connecting pipeline is provided with a control valve, and the control valve is used to adjust the delivery flow of the connecting pipeline.

[0012] As an improvement of the experimental equipment for soil frost heave, it also includes a water supply component, which is arranged between the cylinder and the hot end temperature control disk and is used to replenish water to the soil sample inside the cylinder.

[0013] As an improvement to the experimental equipment for soil frost heave, the water supply assembly includes a water supply pipe, a stop valve and a water supply tray for connecting to a water supply device, the water supply pipe is connected to the water supply tray, and the stop valve is arranged on the water supply pipe.

[0014] As an improvement to the experimental equipment for soil frost heave, the equipment body is provided with a pipe clamp, and the water supply pipe can be snap-fitted with the pipe clamp.

[0015] As an improvement of the experimental equipment for soil frost heave, it also includes a permeable stone arranged between the cylinder and the water supply tray to prevent water condensation in the soil sample in the cylinder.

[0016] As an improvement to the experimental equipment for soil frost heave, the sensing component includes a first sensor for detecting the temperature of the soil sample, a second sensor for detecting the pressure value applied to the soil sample, and a third sensor for detecting the volume change of the soil sample during the experiment.

[0017] The beneficial effects of the present invention are as follows: the experimental equipment controls the temperature of the soil sample by delivering a cold working medium through a low-temperature circulation pump. The cold working medium flows through a cold-end temperature control disk and a hot-end temperature control disk in sequence through a circulation pipeline. The cold-end temperature control disk is located at the upper end of the cylinder and contacts the upper surface of the soil sample in the cylinder. The cold working medium transfers the temperature to the soil sample in the cylinder through the cold-end temperature control disk, thereby achieving a cooling effect; and the heating element can operate to transfer the temperature to the cold working medium in the circulation pipeline through the hot-end temperature control disk, thereby increasing and maintaining the temperature of the cold working medium and ensuring temperature stability during the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0019] Figure 1 This is one of the structural diagrams of the present utility model;

[0020] Figure 2 This is the second structural diagram of the present utility model.

[0021] In the figure: 1. Equipment body; 11. Lifting assembly; 2. Cylinder; 3. Low-temperature circulation pump; 31. Circulation pipeline; 32. Regulating valve; 4. Cold-end temperature control panel; 5. Hot-end temperature control panel; 51. Heating element; 6. Sensing assembly; 61. First sensor; 62. Third sensor; 7. Pressure assembly; 71. Connecting pipe; 72. Cylinder; 73. Piston; 74. Control valve; 8. Water supply assembly; 81. Water supply pipeline; 82. Water supply tray; 83. Pipe clamp; 84. Permeable stone; 85. Stop valve; 9. Soil sample. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are some embodiments of the present invention, not all embodiments. 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.

[0023] like Figure 1 and Figure 2 As shown, an experimental device for soil frost heave includes an equipment body 1, a cylinder 2 installed on the equipment body 1 and used to install a soil sample 9, a low-temperature circulation pump 3, a regulating valve 32 and a heating element 51. A cold-end temperature control disk 4 and a hot-end temperature control disk 5 are respectively installed at both ends of the cylinder 2, and the heating element 51 is arranged on the hot-end temperature control disk 5. The low-temperature circulation pump 3 has a circulation pipeline 31 for conveying a cold working medium. The circulation pipeline 31 is connected to the cold-end temperature control disk 4 and the hot-end temperature control disk 5 in sequence to control the temperature of the soil sample 9 in the cylinder 2; the regulating valve 32 is arranged on the circulation pipeline 31, which can control the flow rate of the cold working medium; the equipment body 1 is provided with a sensing component 6 for real-time monitoring of the temperature change, pressure change and volume change of the soil sample 9 during the experiment.

[0024] Specifically, the temperature of the soil sample 9 is controlled by delivering a cold medium via a low-temperature circulating pump 3. The cold medium flows sequentially through a cold-end temperature control disk 4 and a hot-end temperature control disk 5 via a circulation line 31. The cold-end temperature control disk 4 is located at the upper end of the cylinder 2 and contacts the upper surface of the soil sample 9 within the cylinder 2. The cold medium transfers its temperature through the cold-end temperature control disk 4 to the soil sample 9 within the cylinder 2, thereby achieving a cooling effect. The heating element 51, on the other hand, transfers its temperature through the hot-end temperature control disk 5 to the cold medium in the circulation line 31, thereby raising and maintaining the temperature of the cold medium and ensuring temperature stability during the experiment. A regulating valve 32 is provided on the circulation line 31 to control the flow of the cold medium. Adjusting the opening of the regulating valve 32 changes the flow rate and volume of the cold medium in the line, thereby achieving fine-grained regulation of the temperature of the soil sample 9. By monitoring the temperature, pressure, and volume changes of soil sample 9 in real time through sensing component 6, the device can acquire comprehensive experimental data, providing strong support for in-depth research on the frost heave mechanism of soil, while also ensuring the accuracy of the data from the frost heave experiment on soil sample 9. Heating element 51, in conjunction with low-temperature circulating pump 3, regulates the hot end temperature, improving the temperature control function of the experimental equipment and ensuring that a variety of environmental conditions, from extreme cold to moderate and even high temperatures, can be simulated.

[0025] This experimental equipment achieves precise control and real-time monitoring of the temperature, pressure, and humidity of soil sample 9 through the collaborative operation of a low-temperature circulating pump 3, a regulating valve 32, a heating element 51, and a sensing assembly 6. The temperature of soil sample 9 is controlled by delivering a cold working medium using the low-temperature circulating pump 3. The regulating valve 32 controls the flow of the cold working medium to achieve precise temperature regulation. The heating element 51 transmits the temperature of the cold working medium in the circulating line 31 via the hot-end temperature control disk 5, thereby raising and maintaining the temperature of the cold working medium and ensuring temperature stability during the experiment.

[0026] Furthermore, a single cryogenic circulating pump 3 is required to achieve multiple cooling processes, reducing complex setup steps and making experimental setup and operation easy even for non-expert users. Costs are also reduced by using more cost-effective materials and a simplified system design, such as the cryogenic circulating pump 3 combined with a simple electric control valve 32, significantly reducing equipment costs.

[0027] The low-temperature circulating pump 3, in conjunction with the heating element 51, the cold-end temperature control panel 4, and the hot-end temperature control panel 5, not only provides one-way cooling to simulate rapid soil freezing, but also maintains a stable temperature gradient when needed, enabling bidirectional cooling. This functionality is particularly suitable for simulating daytime and nighttime temperature fluctuations or seasonal temperature changes found in natural environments, providing researchers with a platform for precisely controlling experimental temperature conditions.

[0028] Some embodiments of the present application also include a pressure assembly 7 that operates to squeeze the soil sample 9 within the cylinder 2, thereby applying pressure to the soil sample 9. Specifically, in soil frost heave experiments, simulating the various pressure conditions to which soil is subjected in real environments is crucial for studying its frost heave characteristics. The pressure assembly 7 can simulate these pressure conditions, improving the accuracy and reliability of experimental results.

[0029] In some embodiments of the present application, the pressure assembly 7 includes a cylinder 72 provided in the device body 1, a connecting pipe 71 for connecting to a pressure source and communicating with the cylinder 72, and a piston 73 movably provided in the cylinder 72. The connecting pipe 71 transports the fluid provided by the pressure source to the cylinder 72 to drive the piston 73 to move and squeeze the soil sample 9 in the cylinder 2. Specifically, the fluid provided by the pressure source is transported to the cylinder 72 through the connecting pipe 71. The fluid squeezes the piston 73 in the cylinder 72, driving the piston 73 to move and squeeze the soil sample 9 in the cylinder 2, thereby applying pressure. At the same time, the control valve 74 on the connecting pipe 71 can adjust the flow rate of the fluid, thereby controlling the amount of pressure applied to the soil sample 9. The experimental effect of the pressure assembly 7 is that it can apply controllable pressure, simulate the pressure conditions in a real environment, improve the accuracy and reliability of the experimental results, and help reveal the mechanism of the influence of pressure on the frost heave characteristics of soil.

[0030] Furthermore, the piston 73 is connected to the cold-end temperature control disk 4 , and the piston 73 drives the temperature control disk to move and squeeze the soil sample 9 in the cylinder 2 to apply pressure to the soil sample 9 .

[0031] The cylinder 72 is detachably connected to the device body 1, allowing the pressure control range to be adjusted by selecting cylinders 72 of different diameters. This increases experimental flexibility. Different experiments may require different pressure ranges. By replacing the cylinder 72, researchers can adjust the device's pressure output according to specific experimental requirements, thereby adapting to various test conditions from low pressure to high pressure. Compared to traditional hydraulic or servo drive systems, the pressure control system of the present invention not only reduces equipment costs but also reduces the complexity of operation and maintenance. This simplified system design makes the equipment more reliable, reduces failure rates, and also reduces energy consumption.

[0032] In other embodiments, a pressure plate may be provided at the end of the piston 73 to contact the soil sample 9 in the cylinder 2 , thereby squeezing the soil sample 9 in the cylinder 2 to apply pressure to the soil sample 9 .

[0033] In some embodiments of the present application, the connecting pipe 71 is provided with a control valve 74, and the control valve 74 is used to adjust the delivery flow of the connecting pipe 71. Specifically, in the soil frost heave experimental equipment, the control valve 74 is provided in the connecting pipe 71 and plays a key role. The control valve 74 adjusts the flow and pressure of the fluid working medium in the pipeline by changing the opening; it can achieve precise control of the temperature and pressure of the soil sample 9 and meet the requirements of stable temperature conditions in the experiment. The control valve 74 can adjust the flow of the fluid working medium delivered to the pressure component 7, and then control the pressure applied by the piston 73 to the soil sample 9, so that researchers can observe the frost heave behavior of the soil sample 9 under different pressure conditions.

[0034] In some embodiments of the present application, a water supply assembly 8 is further included, disposed between the cylinder 2 and the hot-end temperature control disk 5, for replenishing moisture to the soil sample 9 within the cylinder 2. The water supply assembly 8 can effectively replenish moisture to the soil sample 9, simulating soil frost heave experiments under different humidity conditions, thereby improving the accuracy and reliability of the experiment.

[0035] In some embodiments of the present application, the water supply assembly 8 includes a water supply pipe 81 for connecting to a water supply device, a shutoff valve 85, and a water supply tray 82. The water supply pipe 81 is connected to the water supply tray 82, and the shutoff valve 85 is disposed on the water supply pipe 81. Specifically, during use, the water supply pipe 81 is connected to the water supply device. When it is necessary to replenish water to the soil sample 9 in the cylinder 2, the shutoff valve 85 is first opened, allowing water from the water supply device (such as a water tank, water pump, etc.) to flow through the water supply pipe 81 into the water supply tray 82. The water supply tray 82 is located between the cylinder 2 and the hot end temperature control tray 5 and can evenly release water into the soil sample 9 in the cylinder 2. This effectively replenishes water to the soil sample 9, simulates soil frost heave experiments under different humidity conditions, and improves the accuracy and reliability of the experiment. The provision of the shutoff valve 85 allows the water supply to be precisely controlled and adjusted according to experimental needs to meet the requirements of different experimental conditions.

[0036] In some embodiments of the present application, the device body 1 is provided with a pipe clamp 83, with which the water supply pipe 81 can be engaged. Specifically, the provision of the pipe clamp 83 can firmly clamp the water supply pipe 81, ensuring the stability and safety of the pipe during the experiment, preventing the pipe from moving or falling off, thereby ensuring the continuity and stability of the water supply. In addition, the pipe clamp 83 also makes the installation and removal of the water supply pipe 81 convenient and quick, improving the operability of the device, and providing a strong guarantee for the smooth progress of the experiment.

[0037] In some embodiments of the present application, a permeable stone 84 is further provided between the cylinder 2 and the water supply tray 82 to prevent moisture condensation in the soil sample 9 within the cylinder 2. Specifically, the permeable stone 84 is provided between the cylinder 2 and the water supply tray 82 to prevent moisture condensation at the bottom of the soil sample 9 within the cylinder 2, ensuring that moisture can evenly penetrate into the soil sample 9, thereby more naturally simulating the infiltration process in a natural environment.

[0038] In some embodiments of the present application, the sensing assembly 6 includes a first sensor 61 for detecting the temperature of the soil sample 9, a second sensor for detecting the pressure value applied to the soil sample 9, and a third sensor 62 for detecting the volume change of the soil sample during the experiment.

[0039] Specifically, the first sensor 61 is used to detect the temperature of the soil sample 9. By measuring the temperature change of the soil sample 9 during the experiment, the temperature state of the soil sample 9 can be understood in real time, providing basic data for analyzing the frost heave process. The second sensor is used to detect the pressure value applied to the soil sample 9. During the frost heave experiment, the soil sample 9 will be squeezed by the pressure component 7. The second sensor can monitor the pressure value in real time to understand the frost heave behavior of the soil sample 9 under different pressure conditions. The third sensor 62 is used to detect the volume change of the soil sample during the experiment. The volume change is one of the key parameters in the frost heave experiment. The third sensor 62 can accurately measure the volume change of the soil sample 9 during the experiment, thereby analyzing the degree and characteristics of the frost heave.

[0040] The third sensor 62 is a laser ranging sensor used to detect changes in the distance between it and the surface of the soil sample 9 in the cylinder 2 and to feed this information back to the device body 1, thereby calculating the volume change of the soil sample 9 in the cylinder 2. The first sensor 61 is a temperature sensor, at least partially inserted into the soil sample, and the second sensor is a pressure sensor. The first sensor 61, the second sensor, and the third sensor 62 are all electrically connected to the device body 1, or in an electrical signal connection, and are used to feed back the data information obtained from the detection to the device body 1.

[0041] In other embodiments, multiple first sensors 61 are provided, and the multiple first sensors 61 are evenly distributed vertically within the soil sample. Temperature data at different depths of the soil sample can be obtained. By arranging sensors at multiple depths, a complete temperature distribution map of the soil sample in the vertical direction can be obtained.

[0042] The number of the first sensors 61 can be set according to needs, including but not limited to 2, 3, 4, 5, 6, 7, 8, 9 or 10.

[0043] In other embodiments, the device body 1 includes a lifting assembly 11, which is connected to the pressure assembly 7 and the cold-end temperature controller. When placing the cylinder 2 with the soil sample 9 installed, the cold-end temperature controller needs to be driven upward by the lifting assembly 11. After the cylinder 2 is placed, the cold-end temperature controller is controlled to move downward into the cylinder 2 and contact the surface of the soil sample 9.

[0044] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to this utility model.

Claims

1. An experimental device for soil frost heave, characterized in that: The device includes an equipment main body, a cylinder installed on the equipment main body and used to install soil samples, a low-temperature circulation pump, a regulating valve and a heating element. A cold-end temperature control disk and a hot-end temperature control disk are respectively installed at both ends of the cylinder. The heating element is arranged on the hot-end temperature control disk. The low-temperature circulation pump has a circulation pipeline for conveying cold working fluid. The circulation pipeline is connected to the cold-end temperature control disk and the hot-end temperature control disk in sequence to control the temperature of the soil sample in the cylinder; the regulating valve is arranged on the circulation pipeline to control the flow of cold working fluid; the equipment main body is provided with a sensing component for real-time monitoring of the temperature changes, pressure changes and volume changes of the soil sample during the experiment.

2. The experimental equipment for soil frost heave according to claim 1, characterized in that: The invention also includes a pressure component which can be operated to squeeze the soil sample in the cylinder to apply pressure to the soil sample.

3. The experimental equipment for soil frost heave according to claim 2, characterized in that: The pressure assembly includes a cylinder body arranged in the main body of the equipment, a connecting pipe for connecting to a pressure source and communicating with the cylinder body, and a piston movably arranged in the cylinder body. The connecting pipe transports the fluid provided by the pressure source to the cylinder body to drive the piston to move and squeeze the soil sample in the cylinder body.

4. The experimental equipment for soil frost heave according to claim 3, characterized in that: The connecting pipeline is provided with a control valve, and the control valve is used to adjust the delivery flow of the connecting pipeline.

5. The experimental equipment for soil frost heave according to claim 3, characterized in that: It also includes a water supply component, which is arranged between the cylinder and the hot end temperature control disk and is used to replenish water to the soil sample inside the cylinder.

6. The experimental equipment for soil frost heave according to claim 5, characterized in that: The water supply assembly includes a water supply pipe connected to a water supply device, a stop valve and a water supply tray. The water supply pipe is communicated with the water supply tray, and the stop valve is arranged on the water supply pipe.

7. The experimental equipment for soil frost heave according to claim 6, characterized in that: The equipment body is provided with a pipe clamp, and the water supply pipe can be snap-fitted with the pipe clamp.

8. The experimental equipment for soil frost heave according to claim 6, characterized in that: It also includes a permeable stone arranged between the cylinder and the water supply tray to prevent water condensation in the soil sample in the cylinder.

9. The experimental equipment for soil frost heave according to any one of claims 2 to 8, characterized in that: The sensing assembly includes a first sensor for detecting the temperature of the soil sample, a second sensor for detecting the pressure value applied to the soil sample, and a third sensor for detecting the volume change of the soil sample during the experiment.

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