Coarse-particle salinized soil dissolving and sinking performance testing device

Abstract

The utility model relates to a coarse particle salinized soil dissolving and sinking test device, which comprises a bottom plate, a cylinder body, a dial indicator, a loading device and a controller, the cylinder body is arranged on the bottom plate, a lower permeable plate is arranged in the cylinder body, a portal frame is arranged on the bottom plate, the loading device is arranged on the portal frame, and the controller is arranged on the portal frame. The loading end of the loading device is provided with an upper water permeable plate, the dial indicator is arranged on the portal frame, the detection end of the dial indicator is in contact with the upper water permeable plate, a medium cavity used for being filled with a heating medium is formed in the wall of the barrel, the heating medium is oil or water, a first heating plate electrically connected with the controller is arranged in the medium cavity, and a second heating plate electrically connected with the controller is arranged in the first heating plate. A first temperature sensor in signal connection with the controller is arranged in the barrel; the device disclosed by the utility model can be used for completing the melt sinking property measurement test of the coarse-particle saline soil at different temperatures, and the representativeness of test results is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical testing, in particular to a coarse-grained saline soil dissolution and collapse testing device. Background Art

[0002] Saline soil is a general term for saline soil, alkaline soil and various salinized and alkaline soils. Saline soil refers to soil with soluble salt content that is significantly harmful to crop growth, and alkaline soil refers to soil containing a large amount of exchangeable sodium that is harmful to plant growth and changes soil properties. Saline soil is mainly distributed in inland arid and semi-arid areas, and is also distributed in coastal areas. For roads paved in saline soil areas, when the ambient temperature changes, the soil will not only expand and deform at low temperatures and melt and sink at high temperatures, but also when flooding occurs, the salt inside the coarse-grained saline soil will dissolve in water, and the salt that originally played a skeleton supporting role will be lost with the water, resulting in soil dissolution, roadbed sinking, and sinking cracks in the concrete layer paved on the road surface, affecting driving safety.

[0003] After searching, the Chinese utility model patent with the patent publication number CN209280460U discloses a coarse-grained saline soil dissolution test device, and the Chinese invention patent with the patent publication number CN110618254B ​​discloses a test device for measuring the solubility and collapse of saline soil; the above-mentioned prior arts all adopt the method of immersing the sample in water and pressurizing it to conduct the solubility and collapse experiment. However, when the sample is fully immersed in water, temperature is another key factor affecting the solubility and collapse of saline soil. Statistics show that: for soluble salts, within a certain range, as the temperature increases, the solubility of soluble salts increases significantly, so that more soluble salts are lost with water, resulting in an increase in soil dissolution and collapse. Therefore, it is urgent to design a coarse-grained saline soil dissolution and collapse test device to solve the problems existing in the prior art. Utility Model Content

[0004] The embodiment of the utility model provides a coarse-grained saline soil solubility test device, which controls the test environment temperature and tests the solubility of samples under different temperature conditions, thereby solving the problem of ignoring the influence of temperature on the solubility of coarse-grained saline soil in the prior art and making the test results more representative.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme: a coarse-grained saline soil solubility test device, including a base plate, a cylinder, a dial indicator, a loading device and a controller, the cylinder is arranged on the base plate, a lower water-permeable plate is arranged inside the cylinder, a gantry is arranged on the base plate, the loading device is arranged on the gantry, an upper water-permeable plate is arranged at the loading end of the loading device, the dial indicator is arranged on the gantry, and its detection end is in contact with the upper water-permeable plate, a medium cavity for filling a heating medium is arranged inside the cylinder wall of the cylinder, a first heating plate electrically connected to the controller is arranged inside the medium cavity, and a first temperature sensor connected to the controller signal is arranged inside the cylinder.

[0006] Preferably, a liquid inlet pipe communicating with the inside of the medium cavity is provided at the upper end of the outer wall of the cylinder, a liquid discharge pipe communicating with the inside of the medium cavity is provided at the lower end of the outer wall of the cylinder, and valves are provided at the ends of the liquid inlet pipe and the liquid discharge pipe.

[0007] Preferably, the lower water-permeable plate and the upper water-permeable plate are both sand-based water-permeable plates.

[0008] Preferably, a water tank for containing test water is provided on the gantry, the water tank is connected to a liquid dispensing tube via a water pipe, liquid outlet holes are evenly arranged on the liquid dispensing tube, and a water pump is provided on the water pipe.

[0009] Preferably, the liquid dispensing tube is annular, and its central axis coincides with the central axis of the cylinder.

[0010] Preferably, a throttle valve is provided on the water pipe.

[0011] Preferably, a second heater electrically connected to the controller and a second temperature sensor signal-connected to the controller are provided inside the water tank.

[0012] Preferably, a waste liquid pipe is provided at the lower end of the side wall of the cylinder.

[0013] Compared with the prior art, the utility model adopts the coordinated arrangement of a bottom plate, a cylinder, a dial indicator, a loading device, a controller, a lower water-permeable plate, an upper water-permeable plate, a medium cavity, a first heating plate and a first temperature sensor. The sample is placed on the lower water-permeable plate, and the loading device drives the upper water-permeable plate to extend into the cylinder to form a sealed environment. The first heating plate heats the heating medium, and the heat is transferred to the inside of the cylinder. After reaching the preset temperature, the loading device applies a load to the sample, injects water into the sample through the upper water-permeable plate, and detects the degree of compression of the sample through the dial indicator, thereby completing the solubility measurement test of coarse-grained saline soil at different temperatures and improving the representativeness of the test results.

[0014] Compared with the prior art, the utility model prevents the water temperature from destroying the constant temperature environment inside the cylinder and improves the accuracy of the test results by disposing the second heater and the second temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] In the figure: 1, bottom plate; 2, cylinder; 3, dial indicator; 4, loading device; 5, gantry; 6, lower water-permeable plate; 7, upper water-permeable plate; 8, medium cavity; 9, first heating plate; 10, liquid inlet pipe; 11, liquid discharge pipe; 12, water tank; 13, water pipe; 14, liquid distribution pipe; 15, liquid outlet hole; 16, water pump; 17, throttle valve; 18, waste liquid pipe. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solution of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] like Figure 1 As shown, a coarse-grained saline soil solubility test device includes a base plate 1, a cylinder 2, a dial indicator 3, a loading device 4 and a controller. The cylinder 2 is arranged on the base plate 1, and a lower water-permeable plate 6 is arranged inside the cylinder 2. A gantry 5 is arranged on the base plate 1. The loading device 4 is arranged on the gantry 5. An upper water-permeable plate 7 is arranged at the loading end of the loading device 4. The dial indicator 3 is arranged on the gantry 5, and its detection end is in contact with the upper water-permeable plate 7. A medium cavity 8 for filling a heating medium is arranged inside the cylinder wall of the cylinder 2, and the heating medium is oil or water. A first heating plate 9 electrically connected to the controller is arranged inside the medium cavity 8, and a first temperature sensor connected to the controller signal is arranged inside the cylinder 2.

[0019] In order to facilitate the replacement of the heating medium, preferably, a liquid inlet pipe 10 connected to the interior of the medium cavity 8 is provided at the upper end of the outer wall of the cylinder 2, and a liquid discharge pipe 11 connected to the interior of the medium cavity 8 is provided at the lower end of the outer wall of the cylinder 2, and valves are provided at the ends of the liquid inlet pipe 10 and the liquid discharge pipe 11.

[0020] In order to achieve the purpose of the lower water-permeable plate 6 and the upper water-permeable plate 7 having both high strength and water permeability, preferably, the lower water-permeable plate 6 and the upper water-permeable plate 7 are both sand-based water-permeable plates, and the sand-based water-permeable plates are pressed with sand as the material. The sand-based water-permeable material uses desert aeolian sand as the raw material and is extruded by a sintering-free process. It has the function of water permeability and water filtering, and is energy-saving and environmentally friendly. It permeates by changing the surface tension of water, and the surface is dense, which solves the contradiction between strength and water permeability, so that the sand-based water-permeable material has high strength, fast water permeability and long water permeability.

[0021] In order to achieve the purpose of improving the degree of automation of the test, preferably, a water tank 12 for containing test water is provided on the gantry 5, the water tank 12 is connected to a liquid dispensing tube 14 through a water pipe 13, liquid outlet holes 15 are evenly arranged on the liquid dispensing tube 14, and a water pump 16 is arranged on the water pipe 13. The test water contained in the water tank 12 is deionized water, and deionized water can prevent the soluble salt contained in the water from affecting the test. The water pump 16 transports the deionized water in the water tank 12 to the liquid dispensing tube 14, and flows out from each liquid outlet hole 15, thereby improving the degree of automation.

[0022] In order to achieve the purpose of uniform penetration of the test water into the sample, preferably, the liquid separation tube 14 is annular, and the central axis thereof coincides with the central axis of the cylinder 2 .

[0023] In order to adjust the water flow rate, preferably, a throttle valve 17 is provided on the water pipe 13 .

[0024] In order to achieve the purpose of improving the accuracy of the test results, preferably, a second heater electrically connected to the controller and a second temperature sensor connected to the controller signal are arranged inside the water tank 12. The second heater heats the test water to the same temperature as the internal ambient temperature of the cylinder 2 before passing it into the cylinder 2, so as to avoid the water temperature destroying the constant temperature environment inside the cylinder 2 and improve the accuracy of the test results.

[0025] In order to discharge the test water from the cylinder 2 , preferably, a waste liquid pipe 18 is provided at the lower end of the side wall of the cylinder 2 .

[0026] During specific use, test water is added to the water tank 12, and the sample is placed on the lower permeable plate 6. The loading device 4 drives the upper permeable plate 7 to extend into the cylinder 2 to form a sealed environment. The first heating plate 9 heats the heating medium, and the heat is transferred to the inside of the cylinder 2. After reaching the preset temperature, the second heater heats the test water to the same temperature as the internal environment of the cylinder 2. The loading device 4 applies a load to the sample, and the water pump 16 transports the test water in the water tank 12 to the liquid separator 14, and flows from each liquid outlet 15 to the upper permeable plate 7. The test water penetrates the upper permeable plate 7 and soaks on the sample. The compression degree of the sample is detected by the dial indicator 3, thereby completing the solubility measurement test of coarse-grained saline soil at different temperatures.

[0027] Compared with the prior art, the utility model is provided with a base plate 1, a cylinder 2, a dial indicator 3, a loading device 4, a controller, a lower water-permeable plate 6, an upper water-permeable plate 7, a medium cavity 8, a first heating plate 9 and a first temperature sensor. The sample is placed on the lower water-permeable plate 6, and the loading device 4 drives the upper water-permeable plate 7 to extend into the cylinder 2 to form a sealed environment. The first heating plate 9 heats the heating medium, and the heat is transferred to the inside of the cylinder 2. After reaching the preset temperature, the loading device 4 applies a load to the sample, injects water into the sample through the upper water-permeable plate 7, and detects the compression degree of the sample through the dial indicator 3, thereby completing the solubility measurement test of coarse-grained saline soil at different temperatures and improving the representativeness of the test results.

[0028] Compared with the prior art, the utility model prevents the water temperature from destroying the constant temperature environment inside the cylinder 2 by disposing the second heater and the second temperature sensor, thereby improving the accuracy of the test results.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coarse-grained saline soil solubility test device, comprising a base plate (1), a cylinder (2), a dial indicator (3), a loading device (4) and a controller, Features: The cylinder (2) is arranged on a bottom plate (1), a lower water-permeable plate (6) is arranged inside the cylinder (2), a gantry (5) is arranged on the bottom plate (1), the loading device (4) is arranged on the gantry (5), an upper water-permeable plate (7) is arranged at the loading end of the loading device (4), the dial gauge (3) is arranged on the gantry (5), and its detection end is in contact with the upper water-permeable plate (7), a medium cavity (8) for filling a heating medium is arranged inside the cylinder wall of the cylinder (2), a first heating plate (9) electrically connected to a controller is arranged inside the medium cavity (8), and a first temperature sensor connected to a controller signal is arranged inside the cylinder (2).

2. A coarse-grained saline soil dissolution test device according to claim 1, Features: The upper end of the outer wall of the cylinder (2) is provided with a liquid inlet pipe (10) communicating with the interior of the medium cavity (8), and the lower end of the outer wall of the cylinder (2) is provided with a liquid discharge pipe (11) communicating with the interior of the medium cavity (8), and valves are provided at the ends of the liquid inlet pipe (10) and the liquid discharge pipe (11).

3. A coarse-grained saline soil dissolution test device according to claim 1, Features: The lower water-permeable plate (6) and the upper water-permeable plate (7) are both sand-based water-permeable plates.

4. A coarse-grained saline soil solubility test device according to claim 1, Features: A water tank (12) for containing test water is arranged on the gantry (5); the water tank (12) is connected to a liquid dispensing pipe (14) via a water pipe (13); liquid outlet holes (15) are evenly arranged on the liquid dispensing pipe (14); and a water pump (16) is arranged on the water pipe (13).

5. A coarse-grained saline soil dissolution test device according to claim 4, Features: The liquid dispensing tube (14) is annular, and its central axis coincides with the central axis of the cylinder (2).

6. A coarse-grained saline soil dissolution and collapse testing device according to claim 4, Features: The water pipe (13) is provided with a throttle valve (17).

7. A coarse-grained saline soil dissolution test device according to claim 4, Features: A second heater electrically connected to the controller and a second temperature sensor signal-connected to the controller are arranged inside the water tank (12).

8. A coarse-grained saline soil solubility test device according to claim 1, Features: A waste liquid pipe (18) is provided at the lower end of the side wall of the cylinder (2).

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