A Visual Transparent Soil Model Test Apparatus and Method for Studying Embankment Deformation

Abstract

This invention discloses a visual transparent soil model test device and method for studying embankment deformation, belonging to the field of highway engineering test technology. It solves the problem that existing model test methods cannot visually display the internal deformation of embankments under load, thus hindering the analysis of foundation deformation patterns. Specifically, it includes a model box located at the bottom of a reaction frame, with an actuator mounted on top of the reaction frame. The model box is filled with soft soil material, and a loading plate is laid on top of the soft soil material. The bottom of the actuator contacts the loading plate. In this invention, the actuator applies a sinusoidal load to the soft soil material inside the model box, simulating traffic loads on the embankment. An industrial camera is used to capture real-time images of the changes in the speckle field of the soft soil beneath the embankment and within the embankment during the application of traffic loads, thereby analyzing the deformation mechanism of highway embankments in complex mountainous terrain. The analysis results are accurate and reliable, providing data support for the design and construction of highway subgrades in mountainous areas.

Description

Technical Field

[0001] This invention relates to the field of highway engineering testing technology, and in particular to a visual transparent soil model test device and method for studying embankment deformation. Background Technology

[0002] Highway embankments refer to fill roadbeds where the top surface of the roadbed is higher than the original ground level. Structurally, they are divided into upper embankments and lower embankments. The upper embankment refers to the fill portion within a thickness of 0.7m below the roadbed, while the lower embankment refers to the fill portion below the upper embankment.

[0003] Current technologies for studying the working characteristics of highway embankments in complex mountainous terrain involve constructing an indoor test model to test the embankment's bearing capacity. During the test, a loading device is placed at the top of the model's trench, and hydraulic jacks are used for loading. The test model is a trapezoidal embankment, with a uniformly distributed load applied to the top. Data on internal stress, slope and top surface displacement are collected using instruments such as earth pressure cells and dial gauges. Alternatively, numerical simulation methods are employed. Finite element method (FEM) and discrete element method (DIM) numerical analysis software are used to model and analyze the embankment. By inputting the physical and mechanical parameters of the embankment fill material, boundary conditions, and load conditions, the stress, strain, and displacement distribution of the embankment under different working conditions are simulated to predict its deformation and failure characteristics.

[0004] However, existing embankment test models cannot simulate the internal deformation and displacement of embankments after being subjected to loads, cannot intuitively demonstrate the spatial deformation mechanism of embankment-foundation soil, and cannot analyze the laws of embankment displacement and foundation deformation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a visual transparent soil model test device and method for studying embankment deformation, which solves the problem that existing model test methods cannot intuitively display the internal deformation of the embankment after being subjected to load, and thus cannot analyze the deformation law of the foundation.

[0006] Firstly, in order to achieve the above objectives, the technical solution adopted by the present invention is as follows: A visual transparent soil model test device for studying embankment deformation includes a model box, which is set at the bottom of a reaction frame, and an actuator is installed at the top of the reaction frame. The model box is filled with soft soil material, and a loading plate is laid on top of the soft soil material. The bottom of the actuator contacts the loading plate.

[0007] In this scheme, the actuator applies a sinusoidal load to the soft soil material inside the model box to simulate the traffic load on the highway embankment. An industrial camera is set in front of the model box to capture in real time the changes in the speckle field of the soft soil under the embankment and inside the embankment during the application of the traffic load. This allows for the analysis of the deformation mechanism of the highway embankment under complex mountainous terrain. The analysis results are accurate and reliable, and can provide data support for the design and construction of highway subgrade in mountainous areas.

[0008] Furthermore, the reaction frame includes four support columns and two crossbeams. The bottom of the four support columns is fixed to the test platform; the top of the four support columns is connected to the two crossbeams; the actuator is fixed on the two crossbeams, and the model box is placed on the test platform directly below the actuator.

[0009] Furthermore, two lasers are installed on each side of the model box; an industrial camera is installed perpendicular to the line connecting the two lasers.

[0010] In this scheme, the lasers are arranged symmetrically so that the two laser beams simultaneously irradiate the central section of the model, ensuring that the two laser beams can penetrate the soft soil material from both sides, thus addressing the problem that the lasers cannot completely penetrate the model due to its large length.

[0011] Furthermore, the model box is made of transparent material.

[0012] Secondly, based on the visual transparent soil model test device for studying embankment deformation provided in the first aspect, the present invention provides a visual transparent soil model test method for studying embankment deformation, comprising the following steps: Step S1: Assemble the visual transparent soil model test device for studying embankment deformation; Step S2: Prepare soft soil material and fill the model box with the soft soil material; Step S3: Prepare embankment material and lay the embankment material on top of the filled soft soil material; Step S4: Control the actuator to apply the load and simultaneously turn on the laser; Step S5: Use an industrial camera to capture images of the speckle field formed inside the model box; Step S6: Output the load information of the actuator and the image information captured by the industrial camera, and perform data analysis.

[0013] In this scheme, the soft soil material is divided into plastic soft soil and stiff plastic soft soil. The soft soil material is filled in the model box to simulate the soft soil foundation under the highway. The embankment material is laid on top of the soft soil material to simulate the highway embankment, ensuring the strength of the embankment while ensuring its transparency meets the test requirements. When the actuator applies a load to deform the embankment material and the soft soil material, an industrial camera captures the deformation process of the embankment. Combined with speckle field analysis and displacement measurement, the spatial deformation mechanism of the embankment-foundation is revealed intuitively.

[0014] Further, step S1 includes: Step S101: Place the model box on the test platform and use a level to calibrate the bottom surface of the model box so that the levelness error of the bottom surface of the model box is ≤0.1°; Step S102: Install the actuator on the crossbeam of the reaction frame, adjust the verticality of the piston rod of the actuator so that the axis of the piston rod coincides with the longitudinal center line of the model box, and reserve operating space at the lower end of the piston rod from the top of the model box. Step S103: Install lasers symmetrically on both sides of the model box, and adjust the emission angle of the lasers using a laser collimator so that the two laser beams on both sides are perpendicularly irradiated onto the central section of the model box, forming a laser irradiation area; Step S104: Place the tripod 0.6-1.0m in front of the model box and fix the industrial camera on the tripod; adjust the height of the industrial camera lens so that the center of the lens is at the same height as the center section of the model box.

[0015] Further, step S2 includes: Step S201: Prepare plastic soft soil; White oil and n-dodecane are poured into a mixing tank and mixed to form a mixed pore liquid. The refractive index of the mixed pore liquid is adjusted to 1.46. Then, fumed silica powder and tracer particles are added and stirred continuously to form a paste-like mixture. The paste-like mixture is poured into a vacuum chamber, vacuumed, and internal air bubbles are removed to obtain plastic soft clay. Step S202: Prepare stiff plastic soft soil; A mixed solution with a refractive index of 1.4580 was prepared by mixing n-dodecane and white oil; fused silica sand with a particle size of 0.5-1 mm was selected, dried in an oven to remove moisture, and then cooled to room temperature; the fused silica sand was uniformly mixed with the mixed solution to prepare a hard plastic soft clay. Step S203: Fill with plastic soft soil and stiff plastic soft soil; First, lay stiff plastic soft soil at the bottom of the model box and compact it with a plate vibrator; after the stiff plastic soft soil is filled, lay soft plastic soft soil on top of the stiff plastic soft soil, and place a loading plate on top of the soft plastic soft soil. Apply pre-consolidation pressure in stages on the loading plate with weights. Step S204: Reinforce the plastic soft soil and stiff plastic soft soil with crushed stone piles.

[0016] In this scheme, a transparent soil model is made by successively laying plastic soft soil and hard plastic soft soil inside the model box. The transparent soil model has good transparency. At the same time, tracer particles are added to facilitate tracking the displacement and direction of the transparent soil when deformation occurs under load.

[0017] Further, step S3 includes: Step S301: First, pour fused silica sand with a particle size of 0.5-1mm and fused silica sand with a particle size of 1-2mm into a mixing tank and mix; then add fumed silica powder and stir to disperse the fumed silica powder in the sand body. Step S302: Add the white oil-n-dodecane mixed solution to the mixing tank and stir to form a wet and uniform embankment material; Step S302: Fill the embankment material into the model box in layers, and compact each layer after filling; after the last layer is compacted, use a scraper to smooth the material on the top of the model box, and place a loading plate on the upper surface of the embankment material.

[0018] Furthermore, after filling the embankment material into the model box, white oil is applied to the contact area between the embankment material and the side wall of the model box to reduce the side wall friction resistance when the embankment material deforms.

[0019] Further, step S4 includes: Step S401: Control the piston rod of the actuator to rise and fall, so that the piston rod of the actuator contacts the loading plate on the surface of the soft soil material; Step S402: Adjust the industrial camera parameters and turn on the laser; Step S403: Input the waveform, period, amplitude and loading time of the traffic load into the actuator controller, and control the actuator to start applying the load.

[0020] The beneficial effects of this invention are: This invention provides a visual transparent soil model test device for studying embankment deformation. A transparent soil model is laid inside a model box, and a reaction frame applies a sinusoidal load to the transparent soil model inside the model box to simulate traffic loads on highway embankments. An industrial camera captures real-time images of the changes in the speckle field of the soft soil beneath the embankment and within the embankment during the application of traffic loads, thereby analyzing the deformation mechanism of highway embankments in complex mountainous terrain. This invention utilizes transparent soil materials and visualization technology, combined with speckle field analysis and displacement measurement, to intuitively reveal the spatial deformation mechanism of the embankment-foundation soil, accurately obtain the embankment displacement and foundation deformation patterns under different working conditions, and provide reliable experimental data for establishing a predictive model for highway embankment deformation in mountainous areas. It solves the problems of traditional tests being difficult to observe internal deformation and having incomplete working condition coverage. It has the advantages of high experimental accuracy, strong working condition targeting, and wide applicability of results, and can provide scientific support for the design and construction of highway subgrades in mountainous areas. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the assembly structure of the model box, reaction frame, and actuator in this invention; Figure 2 This is a schematic diagram of the assembly structure of the model box, reaction frame, actuator and industrial camera in this invention; Figure 3 This is a top view of a visual transparent soil model test device for studying embankment deformation according to the present invention.

[0022] Figure label: 1. Model box; 2. Reaction frame; 22. Support column; 21. Crossbeam; 3. Actuator; 4. Loading plate; 5. Laser; 6. Industrial camera; 7. Test platform; Detailed Implementation The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Specific embodiments of the present invention are described below to facilitate understanding by those skilled in the art. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various modifications are obvious as long as they fall within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0023] Example 1 like Figures 1-3 As shown, this embodiment provides a visual transparent soil model test device for studying embankment deformation. This device can simulate the internal deformation of a highway embankment under load, thus facilitating the analysis of foundation deformation patterns. Specifically, it includes: Model box 1, reaction frame 2, actuator 3, loading plate 4, and test platform 7; The model box 1 is located at the bottom of the reaction frame 2, and the actuator 3 is installed on the top of the reaction frame 2. The model box 1 is filled with soft soil material, and a loading plate 4 is laid on top of the soft soil material. The bottom of the actuator 3 contacts the loading plate 4. The reaction frame 2 applies a sinusoidal load to the soft soil material inside the model box 1 to simulate the traffic load on the highway embankment. An industrial camera 6 is set in front of the model box 1 to capture in real time the changes in the speckle field of the soft soil under the embankment and inside the embankment during the application of the traffic load, so as to analyze the deformation mechanism of the highway embankment under complex mountainous terrain.

[0024] The reaction frame 2 includes four support columns 22 and two crossbeams 21; as shown Figure 1 and Figure 3 As shown, the bottom of the four support columns 22 is fixed on the test platform 7; the top of the four support columns 22 is connected to two crossbeams 21; the actuator 3 is fixed on the two crossbeams 21, and the model box 1 is placed on the test platform 7 directly below the actuator 3.

[0025] like Figure 2 As shown, two lasers 5 are respectively installed on both sides of the model box 1; an industrial camera 6 is installed perpendicular to the line connecting the two lasers 5. The lasers 5 are arranged symmetrically so that the two laser beams simultaneously illuminate the central section of the model, ensuring that the two laser beams can penetrate the soft soil material from both sides, thus addressing the problem that the lasers cannot completely penetrate the large length of the model.

[0026] Preferably, the bottom of the model box 1 can also be made of acrylic sheets to set different terrains, such as simulating slopes and valleys.

[0027] Preferably, the loading plate 4 is made of acrylic sheet.

[0028] Preferably, the model box 1 is made of transparent material.

[0029] As a preferred embodiment, the model box 1 is a box made of ordinary rigid acrylic material, with its length, width and height dimensions set to 500mm, 160mm and 300mm respectively.

[0030] Example 2 This embodiment, based on the visual transparent soil model test device for studying embankment deformation provided in Embodiment 1, provides a visual transparent soil model test method for studying embankment deformation, including the following steps: Step S1: Assemble the visual transparent soil model test device for studying embankment deformation; specifically including: Step S101: Place the model box 1 on the test platform 7, and use a level to calibrate the bottom surface of the model box 1 so that the levelness error of the bottom surface of the model box 1 is ≤0.1°; to avoid uneven distribution of test materials or deviation in load application due to tilting of the box.

[0031] Step S102: Install actuator 3 on the crossbeam 21 of reaction frame 2, adjust the verticality of piston rod of actuator 3 so that the axis of piston rod coincides with the longitudinal center line of model box 1, and reserve an operating space of 150-200mm between the lower end of piston rod and the top of model box 1. Step S103: Install lasers 5 symmetrically on both sides of the model box 1. Adjust the emission angle of the lasers 5 using a laser collimator so that the two laser beams on both sides are perpendicularly irradiated onto the central section of the model box 1, forming a uniform laser irradiation area with a width of about 10mm. The diameter of the laser spot is controlled at 2-3mm to ensure that the embankment and soft soil areas can be effectively illuminated. Step S104: Place the tripod 0.6-1.0m in front of the model box 1 and fix the industrial camera 6 on the tripod; adjust the height of the lens of the industrial camera 6 so that the center of the lens is at the same height as the central section of the model box 1; calibrate through the viewfinder of the industrial camera 6 to ensure that the test area inside the model box 1 is completely included in the shooting field of view; set the resolution of the industrial camera 6 to 1600×1200 pixels and the frame rate to 1-5 frames / second; synchronize the time with the data acquisition system of the actuator 3 to ensure that the timestamps of the load data and the image data are consistent.

[0032] Step S2: Prepare soft soil material and fill the soft soil material into model box 1; specifically including: Step S201: Prepare plastic soft soil; the operation is as follows: White oil and n-dodecane were poured into a mixing tank and mixed to form a mixed pore liquid. The refractive index of the mixed pore liquid was adjusted to 1.46. Then, fumed silica powder was added and stirred continuously to form a paste mixture. The paste mixture was poured into a vacuum chamber and evacuated for 1 hour to remove internal air bubbles, thus obtaining plastic soft clay.

[0033] Step S202: Preparation of stiff plastic soft soil; the operation is as follows: A mixed solution with a refractive index of 1.4580 was prepared by mixing n-dodecane and white oil; fused silica sand with a particle size of 0.5-1 mm was selected, placed in an oven and dried at 105℃ for 24 hours to remove moisture, and then cooled to room temperature; the fused silica sand was uniformly mixed with the mixed solution to prepare hard plastic soft clay.

[0034] Step S203: Fill with plastic soft soil and stiff plastic soft soil; First, a 25mm thick layer of stiff plastic soft soil is laid at the bottom of model box 1 and compacted for 3 minutes at a frequency of 50Hz using a plate vibrator to ensure a compaction degree of ≥90%. After the stiff plastic soft soil is filled, soft plastic soft soil is placed inside model box 1, and a loading plate 4 is placed on top of the soft plastic soft soil, with the area of ​​loading plate 4 being consistent with the bottom surface of model box 1. Pre-consolidation pressure is applied in stages on loading plate 4 using weights: first, 30kPa is applied and held for 8 hours; then, the pressure is increased to 45kPa and held for 8 hours; finally, the pressure is increased to 60kPa and held for 8 hours. During the consolidation process, the soft soil compression is recorded every 6 hours to ensure that the final soft soil height is stable at 25mm and the rate of change in compression is ≤0.1mm / 6h, thus completing the soft soil consolidation. If the height of the soft soil exceeds 25mm after consolidation to the predetermined strength, the excess soft soil can be excavated.

[0035] Step S204: Reinforce plastic soft soil and stiff plastic soft soil with crushed stone piles; the operation is as follows: To construct a consolidated drainage board, install a circular pipe corresponding to the length of the crushed stone pile at the corresponding hole in the consolidated drainage board. Place the consolidated drainage board with the circular pipe on top of the soft soil material for consolidation. After consolidation, vertically remove the drainage board and fill the steel pipe with fused silica particles with a particle size of 0.5-1mm. While filling, gently vibrate the pipe with a 2mm diameter thin rod to ensure that the fused silica particles are compacted. Repeat the filling and vibration steps until the silica particles fill the hole in the steel pipe crushed stone pile.

[0036] Step S3: Prepare embankment material and lay it on top of the filled soft soil material; specifically including: Step S301: First, pour fused silica sand with a particle size of 0.5-1mm and fused silica sand with a particle size of 1-2mm into a mixing tank and mix; then add fumed silica powder and tracer particles, and continue stirring for 10 minutes to disperse the fumed silica powder in the sand.

[0037] Step S302: Add white oil-n-dodecane mixed solution to the mixing tank and stir for 15 minutes to form a moist and uniform embankment material. The moisture content of the embankment material is controlled at 23% to ensure that the material has good plasticity and can maintain its shape after compaction.

[0038] Step S302: Fill the embankment material into model box 1 in 5 layers, each layer being 20mm thick. After each layer is filled, compact it using a small compactor at a pressure of 10kPa for 1 minute. After compaction, check the compaction degree of each layer to ensure it is around 93%. After the last layer is compacted, use a scraper to level the material at the top of the model groove and place a loading plate 4 on the upper surface of the embankment material.

[0039] The compaction of the embankment material is completed on the upper part of the plastic soft soil inside the model box 1. The bottom surface of the embankment is in close contact with the surface of the soft soil without gaps. A small amount of white oil can also be filled at the contact points between the embankment material and the side wall of the model box 1 to reduce the frictional resistance of the side wall when the embankment deforms.

[0040] Step S4: Control actuator 3 to apply load, and simultaneously turn on laser 5; specifically including: Step S401: Control the piston rod of actuator 3 to rise and fall, so that the piston rod of actuator 3 contacts the loading plate 4 on the surface of soft soil material; Step S402: Adjust the parameters of industrial camera 6 according to the size of model box 1, laser irradiation angle and soil optical properties; turn on laser 5; Step S403: Input the waveform, period, amplitude and loading time of the traffic load into the actuator 3 controller, and control the actuator 3 to start applying the load.

[0041] Step S5: Use industrial camera 6 to capture images of the speckle field formed inside model box 1; during the experiment, speckle field images are automatically captured at preset time intervals to ensure that speckle field images of the mixed packing material inside model box 1 are captured during the load application process of actuator 3, and a high-quality image dataset is stored.

[0042] Step S6: Export load-time time history curve data through the actuator 3 data acquisition system, including parameters such as load value and loading times at each moment; collect speckle field images before and after each compaction stage by collecting industrial camera 6, and combine with PIV image processing technology to obtain the displacement and acceleration vector magnitude of soil particles inside the embankment and the soft soil below, obtain the displacement cloud map of soil particles inside the embankment under traffic load, and then analyze the deformation mechanism of highway embankment under complex mountainous terrain.

[0043] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention and should be understood as not limiting the scope of protection of the invention to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed herein without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of the invention.

Claims

1. A visual transparent soil model test device for studying embankment deformation, characterized in that: The device includes a model box (1), which is located at the bottom of a reaction frame (2), and an actuator (3) is installed on the top of the reaction frame (2); the model box (1) is filled with soft soil material, and a loading plate (4) is laid on top of the soft soil material, with the bottom of the actuator (3) contacting the loading plate (4).

2. The visual transparent soil model test device for studying embankment deformation according to claim 1, characterized in that: The reaction frame (2) includes four support columns (22) and two crossbeams (21). The bottom of the four support columns (22) is fixed on the test platform (7). The top of the four support columns (22) is connected to the two crossbeams (21). The actuator (3) is fixed on the two crossbeams (21). The model box (1) is placed on the test platform (7) directly below the actuator (3).

3. The visual transparent soil model test device for studying embankment deformation according to claim 1, characterized in that: Two lasers (5) are respectively arranged on both sides of the model box (1); an industrial camera (6) is arranged in the direction perpendicular to the line connecting the two lasers (5).

4. The visual transparent soil model test device for studying embankment deformation according to claim 3, characterized in that: The model box (1) is made of transparent material.

5. A method for using a visual transparent soil model test apparatus for studying embankment deformation according to any one of claims 1 to 4, characterized in that, Includes the following steps: Step S1: Assemble the visual transparent soil model test device for studying embankment deformation; Step S2: Prepare soft soil material and fill the soft soil material into the model box (1); Step S3: Prepare embankment material and lay the embankment material on top of the filled soft soil material; Step S4: Control the actuator (3) to apply the load, and at the same time turn on the laser (5); Step S5: Use an industrial camera (6) to capture images of the speckle field formed inside the model box (1); Step S6: Output the load information of the actuator (3) and the image information captured by the industrial camera, and perform data analysis.

6. The method for using a visual transparent soil model test device to study embankment deformation according to claim 5, characterized in that, Step S1 includes: Step S101: Place the model box (1) on the test platform (7), and use a level to calibrate the bottom surface of the model box (1) so that the levelness error of the bottom surface of the model box (1) is ≤0.1°; Step S102: Install actuator (3) on the crossbeam (21) of the reaction frame (2), adjust the verticality of the piston rod of actuator (3) so that the axis of the piston rod coincides with the longitudinal center line of the model box (1), and reserve operating space at the lower end of the piston rod from the top of the model box (1). Step S103: Install lasers (5) symmetrically on both sides of the model box (1), and adjust the emission angle of the lasers (5) by using a laser collimator so that the two laser beams on both sides are perpendicularly irradiated onto the central section of the model box (1) to form a laser irradiation area; Step S104: Place the tripod 0.6-1.0m in front of the model box (1) and fix the industrial camera (6) on the tripod; adjust the lens height of the industrial camera (6) so that the center of the lens is at the same height as the central section of the model box (1).

7. The method for using a visual transparent soil model test device to study embankment deformation according to claim 5, characterized in that, Step S2 includes: Step S201: Prepare plastic soft soil; White oil and n-dodecane are poured into a mixing tank and mixed to form a mixed pore liquid. The refractive index of the mixed pore liquid is adjusted to 1.

46. Then, fumed silica powder and tracer particles are added and stirred continuously to form a paste-like mixture. The paste-like mixture is poured into a vacuum chamber, vacuumed, and internal air bubbles are removed to obtain plastic soft clay. Step S202: Prepare stiff plastic soft soil; A mixed solution with a refractive index of 1.4580 was prepared by mixing n-dodecane and white oil; fused silica sand with a particle size of 0.5-1 mm was selected, dried in an oven to remove moisture, and then cooled to room temperature; the fused silica sand was uniformly mixed with the mixed solution to prepare a hard plastic soft clay. Step S203: Fill with plastic soft soil and stiff plastic soft soil; First, lay hard plastic soft soil at the bottom of the model box (1) and vibrate it with a plate vibrator; after the hard plastic soft soil is filled, lay soft plastic soft soil on top of the hard plastic soft soil and place a loading plate (4) on top of the soft plastic soft soil, and apply pre-consolidation pressure in stages on the loading plate (4) with weights. Step S204: Reinforce the plastic soft soil and stiff plastic soft soil with crushed stone piles.

8. The method for using a visual transparent soil model test device to study embankment deformation according to claim 5, characterized in that, Step S3 includes: Step S301: First, pour fused silica sand with a particle size of 0.5-1mm and fused silica sand with a particle size of 1-2mm into a mixing tank and mix; then add fumed silica powder and stir to disperse the fumed silica powder in the sand body. Step S302: Add the white oil-n-dodecane mixed solution to the mixing tank and stir to form a wet and uniform embankment material; Step S302: Fill the embankment material into the model box (1) in layers, and compact each layer after filling; after the last layer is compacted, use a scraper to smooth the top material of the model box (1) and place a loading plate (4) on the upper surface of the embankment material.

9. The method for using a visual transparent soil model test device to study embankment deformation according to claim 8, characterized in that: After filling the embankment material into the model box (1), white oil is filled at the contact area between the embankment material and the side wall of the model box (1) to reduce the side wall friction resistance when the embankment material deforms.

10. The method for using a visual transparent soil model test device to study embankment deformation according to claim 8, characterized in that, Step S4 includes: Step S401: Control the piston rod of the actuator (3) to rise and fall, so that the piston rod of the actuator (3) contacts the loading plate (4) on the surface of the soft soil material. Step S402: Adjust the parameters of the industrial camera (6) and turn on the laser (5); Step S403: Input the waveform, period, amplitude and loading time of the traffic load into the actuator (3) controller, and control the actuator (3) to start applying the load.

Images