Experimental tester for testing disintegration characteristic of soil sample under freezing and thawing cycle condition

Abstract

The utility model relates to the field of soil body detection, in particular to an experimental tester for testing disintegration characteristics of a soil sample under a freezing and thawing cycle condition. According to the technical scheme, the experimental tester for testing the disintegration characteristics of the soil sample under the freezing and thawing cycle conditions comprises a testing system, a heating-refrigerating system and a data analysis system, freezing and thawing cycles at different temperatures are simulated for the testing system through the heating-refrigerating system, and the disintegration characteristics of the soil sample under the freezing and thawing cycle conditions are analyzed through the data analysis system. The disintegration characteristic of the soil sample and the microscopic change in the disintegration process of the soil sample are measured through the data analysis system. According to the experimental tester for testing the disintegration characteristic of the soil sample under the freezing and thawing cycle condition, less manpower can be consumed, the test cost is reduced, time and labor are saved, and the operation is simple; the test sample does not need to be transferred in the test process, errors caused by breaking of the test sample during transfer in the disintegration test are solved, and the test result is more accurate and reliable.

Description

Technical Field

[0001] This utility model relates to the field of soil testing, specifically to an experimental testing instrument for testing the disintegration characteristics of soil samples under freeze-thaw cycles. Background Technology

[0002] In recent decades, due to global warming, temperature variations in high-latitude seasonally frozen regions have become more pronounced, leading to frequent freeze-thaw cycles. This has resulted in the deterioration of the mechanical properties of shallow soils in these areas and the destruction of their internal structure, severely impacting their erosability. This structural erosion has a significant destructive effect on engineering infrastructure, potentially causing damage to canal linings, road frost heave, and frost heave, among other engineering disasters. The hydrostatic disintegration test can objectively reflect the changes, disintegration, and dispersion characteristics of soil samples in water, and is a commonly used indicator for evaluating soil erosability.

[0003] Existing methods for studying disintegration under freeze-thaw cycles have many limitations. Soil samples are often subjected to a predetermined number of freeze-thaw cycles using external freeze-thaw equipment before disintegration tests are conducted, neglecting the impact of the previous freeze-thaw cycles on the soil sample structure. Furthermore, conventional disintegration tests lack progressive and cumulative characteristics, and are particularly unsuitable for improved soils with strong erosion resistance. Utility Model Content

[0004] This invention provides an experimental testing instrument for testing the disintegration characteristics of soil samples under freeze-thaw cycles. It reduces manpower, lowers testing costs, saves time and effort, and is easy to operate. It eliminates the need to transfer samples during the test, thus solving the error caused by sample breakage during transfer in disintegration tests, making the test results more accurate and reliable.

[0005] The technical solution of this utility model is as follows:

[0006] An experimental testing instrument for testing the disintegration characteristics of soil samples under freeze-thaw cycles includes a testing system, a heating-cooling system, and a data analysis system. The heating-cooling system simulates freeze-thaw cycles at different temperatures for the testing system, and the data analysis system measures the disintegration characteristics of the soil samples and the microscopic changes during the disintegration process.

[0007] Furthermore, the experimental testing instrument for testing the disintegration characteristics of soil samples under freeze-thaw cycles includes a testing system comprising a fixed support, a disintegration cylinder, a disintegration net, and a force measuring device. The fixed support includes a counterweight base, a column, a first support rod, and a second support rod. The column is vertically fixed on the counterweight base. One end of the first support rod is fixedly connected to the middle of the column, and one end of the second support rod is fixedly connected to the top of the column. The force measuring device is fixedly installed at the other end of the second support rod. The force measuring device is connected to the disintegration net via a rope, and the disintegration net is suspended in the center of the disintegration cylinder.

[0008] Furthermore, in the experimental testing instrument for testing the disintegration characteristics of soil samples under freeze-thaw cycles, a water inlet is provided on the upper left side of the disintegration cylinder, a water outlet is provided on the lower right side of the disintegration cylinder, a wastewater collection dish is provided below the water outlet, and a cover plate is provided on the upper part of the disintegration cylinder.

[0009] Furthermore, the experimental testing instrument for testing the disintegration characteristics of soil samples under freeze-thaw cycle conditions includes a refrigeration-heating system comprising a heating-cooling pipe, a heating-cooling unit, and an insulation layer. The heating-cooling pipe is disposed on both sides inside the disintegration cylinder and is connected to the heating-cooling unit. The insulation layer covers the outside of the disintegration cylinder.

[0010] Furthermore, in the experimental testing instrument for testing the disintegration characteristics of soil samples under freeze-thaw cycles, a pipe opening is provided on the cover plate, through which a heating-cooling pipe enters the disintegration cylinder; a slit is provided on the cover plate, through which a rope enters the disintegration cylinder.

[0011] Furthermore, in the experimental testing instrument used to test the disintegration characteristics of soil samples under freeze-thaw cycle conditions, the heating and cooling pipes are arranged in an M-shaped coil on both sides inside the disintegration cylinder.

[0012] Furthermore, the experimental testing instrument for testing the soil sample disintegration characteristics under freeze-thaw cycle conditions includes a data analysis system comprising a camera and a computer. The camera is fixedly installed at the other end of the support rod, and the camera is connected to the computer via a data cable. The force measuring device is also connected to the computer via a data cable.

[0013] Furthermore, in the experimental testing instrument used to test the disintegration characteristics of soil samples under freeze-thaw cycles, small holes are provided on the insulation layer, and the camera takes pictures and records them in real time through the small holes.

[0014] Furthermore, in the experimental testing instrument used to test the disintegration characteristics of soil samples under freeze-thaw cycles, the disintegration mesh has a pore size of 1cm × 1cm.

[0015] The beneficial effects of this invention are as follows: it reduces manpower consumption, lowers testing costs, saves time and effort, and is easy to operate; it eliminates the need to transfer samples during the test, thus solving the error caused by sample breakage during transfer in disintegration tests, making the test results more accurate and reliable. Considering the gradual and cumulative nature of the disintegration of improved soil with strong erosion resistance, it can be considered for application in the determination of soil consolidation technology. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an experimental testing apparatus used to test the disintegration characteristics of soil samples under freeze-thaw cycles. Detailed Implementation

[0017] like Figure 1 As shown, an experimental testing instrument for testing the disintegration characteristics of soil samples under freeze-thaw cycles includes a testing system, a heating-cooling system, and a data analysis system. The heating-cooling system simulates freeze-thaw cycles at different temperatures for the testing system, and the data analysis system measures the disintegration characteristics of the soil samples and the microscopic changes during the disintegration process.

[0018] The testing system includes a fixed support, a disintegration cylinder 11, a disintegration net 7, and a force measuring device 6. The fixed support includes a counterweight base 1, a column 2, a first support rod 3, and a second support rod 4. The column 2 is vertically fixed to the counterweight base 1. One end of the first support rod 3 is fixedly connected to the middle of the column 2, and one end of the second support rod 4 is fixedly connected to the top of the column 2. The force measuring device 6 is fixedly installed at the other end of the second support rod 4 and is connected to the disintegration net 7 via a rope. The disintegration net 7 is suspended in the center of the disintegration cylinder 11. A water inlet 13 is located on the upper left side of the disintegration cylinder 11, and a water outlet 14 is located on the lower right side of the disintegration cylinder 11. A wastewater collection dish 9 is located below the water outlet 14. A cover plate 10 is located above the disintegration cylinder 11. The disintegration net 7 has a 1cm × 1cm aperture. The water outlet 14 is plugged after the experiment begins to prevent water injected into the disintegration cylinder 11 from flowing out.

[0019] The refrigeration-heating system includes a heating-cooling pipe 15, a heating-cooling unit 16, and an insulation layer 12. The heating-cooling pipe 15 is arranged in an M-shaped coil on both sides inside the disintegration cylinder 11. The heating-cooling pipe 15 is connected to the heating-cooling unit 16. The insulation layer 12 covers the outside of the disintegration cylinder 11. A pipe opening is provided on the cover plate 10, through which the heating-cooling pipe 15 enters the disintegration cylinder 11. A slit is provided on the cover plate 10, through which the rope enters the disintegration cylinder 11.

[0020] The data analysis system includes a camera 5 and a computer 8. The camera 5 is fixedly installed at the other end of the support rod 3 and is connected to the computer 8 via a data cable. The force sensor 6 is also connected to the computer 8 via a data cable. Small holes are provided on the insulation layer 12, through which the camera 5 takes pictures and records in real time.

[0021] The testing process includes the following steps: Prepare the soil sample required for disintegration; place the soil sample on the disintegration net 7; record the data from the force gauge 6 at this moment as F0; turn on the camera 5; use the heating-cooling device 16 to set the temperature to -15℃ and maintain this temperature for 12 hours; then set the temperature of the heating-cooling device 16 to 15℃ and maintain this temperature for 12 hours, which constitutes one freeze-thaw cycle; repeat the freeze-thaw cycle 6-8 times, and check the reading F of the force gauge 6 after each freeze-thaw cycle. tAnd the changes in the soil sample at the corresponding time; after the freeze-thaw cycle, turn off the heating-cooling unit 16, and slowly add water from the inlet 13 until the soil sample is completely submerged, then stop adding water, and record the reading of the force gauge 6 at this time as F1; every certain period of time, the computer 8 records the F corresponding to the force gauge 6 at time t in real time. t Continue until the soil sample has completely passed through the disintegration net 7, then open the plug to let the water in the disintegration tank 11 flow into the wastewater collection dish 9.

[0022] The real-time disintegration rate A (%) is calculated as follows:

[0023]

[0024] In the formula: A d A represents the real-time disintegration rate during freeze-thaw cycles. s F0 represents the real-time disintegration volume after water injection, and F1 represents the reading of force gauge 6 (N) when the soil sample has just stabilized after being placed in the disintegration net. t The reading (N) of force gauge 6 after time t (s) is given.

Claims

1. An experimental testing apparatus for testing the disintegration characteristics of soil samples under freeze-thaw cycles, characterized in that, This includes testing systems, heating-cooling systems, and data analysis systems; The testing system includes a fixed support, a disintegration cylinder, a disintegration net, and a force measuring device. The fixed support includes a counterweight base, a column, a first support rod, and a second support rod. The column is vertically fixed on the counterweight base. One end of the first support rod is fixedly connected to the middle of the column, and one end of the second support rod is fixedly connected to the top of the column. The force measuring device is fixedly installed at the other end of the second support rod. The force measuring device is connected to the disintegration net via a rope, and the disintegration net is suspended in the center of the disintegration cylinder. A water inlet is provided on the upper left side of the disintegration cylinder, a water outlet is provided on the lower right side of the disintegration cylinder, a wastewater collection dish is provided below the water outlet, and a cover plate is provided on the upper part of the disintegration cylinder; The refrigeration-heating system includes a heating-cooling pipe, a heating-cooling unit, and an insulation layer. The heating-cooling pipe is located on both sides inside the disintegration cylinder and is connected to the heating-cooling unit. The insulation layer covers the outside of the disintegration cylinder. The cover plate has a pre-drilled pipe opening through which the heating-cooling pipe enters the disintegration cylinder; a slit is provided on the cover plate through which the rope enters the disintegration cylinder. The heating-cooling pipes are arranged in an M-shaped coil on both sides inside the disintegration cylinder; The data analysis system includes a camera and a computer. The camera is fixedly installed at the other end of the support rod and is connected to the computer via a data cable. The force measuring device is also connected to the computer via a data cable.

2. The experimental testing apparatus for testing the disintegration characteristics of soil samples under freeze-thaw cycles according to claim 1, characterized in that, The insulation layer has small holes, through which the camera takes pictures and records in real time.

3. The experimental testing apparatus for testing the disintegration characteristics of soil samples under freeze-thaw cycles according to claim 1, characterized in that, The mesh size of the disintegration mesh is 1cm × 1cm.

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