Saturation device for rubber mixed soil model test

Abstract

The utility model relates to the field of soil body model test saturation, in particular to a rubber mixed soil model test saturation device. The device comprises a model box, a vacuumizing assembly, a saturated liquid permeation assembly and a saturated liquid chamber, wherein rubber mixed soil is placed in the model box; the vacuumizing assembly is used for conducting vacuumizing operation on the interior of the model box from the top of the model box. The saturated liquid permeation assembly comprises a plurality of longitudinal permeation pipelines and a plurality of transverse permeation pipelines, the longitudinal permeation pipelines and the transverse permeation pipelines are laid at the inner bottom of the model box and jointly form a grid shape, and the longitudinal permeation pipelines and the transverse permeation pipelines are each provided with a plurality of holes used for discharging water and wrapped with geotechnical filter cloth; the saturated liquid chamber is communicated with the saturated liquid permeation assembly and used for supplying saturated liquid to the saturated liquid permeation assembly. The device is suitable for rapid and high-quality saturation of rubber light mixed geotechnical materials, and the saturated liquid permeation assembly is high in flexibility, detachable, easy to clean and free of hole blocking risks.

Description

Technical Field

[0001] The utility model relates to the field of soil model test saturation, in particular to a rubber mixed soil model test saturation device. Background Art

[0002] In the field of civil engineering, the volume of vehicles, speed and load are increasing. The major earthquakes that have occurred in recent years have also caused immeasurable damage to the road system, which is a vital engineering project. The influence of dynamic loads on the stress-deformation characteristics of pavement and roadbed is also increasing, which has also caused various roadbed and pavement problems, directly affecting the performance of highways. Among them, differential settlement of the roadbed will damage the pavement structure, greatly reduce driving safety, make it difficult to ensure riding comfort, and increase the alarming road maintenance costs. Therefore, it is very urgent to seek a new roadbed material that can still maintain good engineering properties under the long-term action of dynamic loads.

[0003] The dynamic stiffness of rubber materials is greater than the static stiffness, and the impact stiffness is greater than the dynamic stiffness, which is beneficial to reduce impact deformation and dynamic deformation. It can be used as an alternative material in road engineering, which can greatly improve the quality and service life of roadbed and pavement. In order to study the applicability of new rubber lightweight mixed geotechnical materials as roadbed fillers, it is often necessary to conduct various mechanical tests on rubber mixed soil to explore its static and dynamic characteristics. However, indoor unit tests can only consider the material properties of rubber mixed soil as a new type of soil, but cannot consider its dynamic response when it is used as roadbed filler under dynamic load in actual engineering. Therefore, it is necessary to use model tests to simulate its actual vibration reduction performance under dynamic loads. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a rubber mixed soil model test saturation device, which is suitable for the rapid and high-quality saturation of rubber lightweight mixed geotechnical materials, providing high-quality material preparation for subsequent tests, and the saturated liquid penetration component is highly flexible, detachable, easy to clean, and has no risk of clogging.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a rubber mixed soil model test saturation device, comprising:

[0006] A model box, in which the rubber mixed soil is placed;

[0007] A vacuum pumping component, used for performing a vacuum pumping operation on the inside of the model box from the top of the model box;

[0008] The saturated liquid infiltration assembly includes a plurality of longitudinal infiltration pipes and a plurality of transverse infiltration pipes which are laid on the bottom of the model box and together form a grid, wherein the longitudinal infiltration pipes and the transverse infiltration pipes are both provided with a plurality of holes for water discharge and are both wrapped with geotextile filter cloth;

[0009] The saturated liquid chamber is connected to the saturated liquid permeation assembly and is used to supply saturated liquid to the saturated liquid permeation assembly.

[0010] In order to further improve the flexibility of use, the longitudinal infiltration pipe and the transverse infiltration pipe are collectively referred to as infiltration pipes, and the intersecting infiltration pipes are connected through pipe joints.

[0011] To further facilitate the control of the penetration rate, the bottom of the saturated liquid chamber is connected to the saturated liquid penetration component through a model box liquid inlet pipe, and a gas pressure control component for controlling the gas pressure therein is provided on the top.

[0012] A specific structure of an air pressure control component is further provided, the air pressure control component includes an air bag placed in the saturated liquid chamber and above the liquid surface, and an air compressor connected to the air bag through an air pressure control pipeline, and the air pressure control pipeline is equipped with a pressure gauge.

[0013] In order to further facilitate the collection of liquid in the model box, the rubber mixed soil model test saturation device also includes a liquid collecting tank, a model box liquid outlet pipe is provided at the bottom of the model box, and the liquid collecting tank is used to receive the liquid discharged from the model box liquid outlet pipe.

[0014] In order to further reuse the collected liquid, the rubber mixed soil model test saturation device also includes a liquid pump and a distillation saturation component, the inlet of the liquid pump is connected to the liquid collecting tank, the outlet is connected to the inlet of the distillation saturation component, and the outlet of the distillation saturation component is connected to the saturated liquid chamber.

[0015] A specific structure of a vacuum pump component is further provided, the vacuum pump component includes a vacuum pump, the vacuum pump is connected to the model box through a vacuum pipe, the vacuum pipe is equipped with a pressure gauge and an external air pressure valve for controlling whether the vacuum pipe is connected to the outside world.

[0016] In order to further minimize the impact of the injected saturated liquid on the test soil, the longitudinal infiltration pipe and the transverse infiltration pipe are both provided with a plurality of holes along their circumferences.

[0017] After adopting the above technical solution, the utility model has the following beneficial effects:

[0018] 1. The utility model combines the bottom saturation liquid saturation method with the vacuum saturation method, which improves the saturation efficiency while improving the saturation quality of the soil sample. In addition, considering that the liquefaction direction under the action of earthquakes mainly develops from bottom to top, when experimentally studying its dynamic characteristics, the bottom penetration saturation method is selected to be closer to the actual working conditions.

[0019] 2. The saturated liquid penetration component of the utility model has multiple longitudinal penetration pipes and transverse penetration pipes, which can be flexibly combined and utilized, are not restricted by the size of the test specimen, can be well adapted to model boxes of different shapes and sizes, and can be reused many times.

[0020] 3. During the test, soil particles will inevitably enter the saturated liquid penetration component. The saturated liquid penetration component in the utility model is detachable, easy to clean, and has no risk of clogging. Furthermore, the longitudinal penetration pipe and the transverse penetration pipe are both provided with holes along the circumference, which maximizes the penetration area to reduce the impact disturbance of hydraulic pressure on the surrounding soil. The use of geotextile filter cloth wrapping is not only used to block soil particles, but also has a certain effect of reducing the impact on the surrounding soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a saturation device for a rubber-mixed soil model test of the utility model;

[0022] Figure 2 It is a plan view of the saturated liquid permeation assembly of the utility model;

[0023] In the figure, 1. model box; 2. vacuum pump assembly; 21. vacuum pump; 22. vacuum pump tube; 23. pressure gauge; 24. external air pressure valve; 3. saturated liquid penetration assembly; 31. longitudinal penetration pipe; 32. transverse penetration pipe; 33. hole; 34. pipe joint; 4. saturated liquid chamber; 5. model box liquid inlet pipe; 6. air pressure control assembly; 61. air bag; 62. air pressure control pipe; 63. air compressor; 64. air pressure gauge; 7. liquid collecting tank; 8. model box liquid outlet pipe; 9. liquid pump; 10. distillation saturation assembly; 100. rubber mixed soil. DETAILED DESCRIPTION

[0024] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0025] Embodiment 1

[0026] like Figure 1 , 2 As shown, a saturation device for a rubber mixed soil model test comprises:

[0027] A model box 1, in which the rubber mixed soil 100 is placed;

[0028] A vacuum pumping assembly 2 is used to perform a vacuum pumping operation on the inside of the model box 1 from the top of the model box 1;

[0029] The saturated liquid infiltration assembly 3 includes a plurality of longitudinal infiltration pipes 31 and a plurality of transverse infiltration pipes 32 which are laid on the bottom of the model box 1 and together form a grid. The longitudinal infiltration pipes 31 and the transverse infiltration pipes 32 are both provided with a plurality of holes 33 for water discharge and are both wrapped with geotextile filter cloth.

[0030] The saturated liquid chamber 4 is connected to the saturated liquid permeation assembly 3 and is used for supplying saturated liquid to the saturated liquid permeation assembly 3 .

[0031] Preferably, the longitudinal permeation pipe 31 and the transverse permeation pipe 32 are collectively referred to as permeation pipes, and the intersecting permeation pipes are connected through pipe joints 34. Figure 2 In the example shown, the size of the model box 1 can be 75*45*60cm. The "4 horizontal and 8 vertical" infiltration pipe arrangement is determined according to the length-width ratio of the bottom surface of the model box 1. The principle of division is to make each area affected by the infiltration of the infiltration pipe as uniform as possible.

[0032] It should be noted that for conventional soil, the rain method is generally used for sample preparation, but the rubber mixed soil 100 in this embodiment is a mixed soil material of lightweight rubber and soil. Since the density of rubber particles is less than that of water, they will float on the water surface, so it is impossible to prepare samples in the traditional way. This embodiment combines the bottom saturation liquid saturation method with the vacuum saturation method, and improves the saturation efficiency while improving the saturation quality of the soil sample. In addition, considering that the liquefaction direction under the action of an earthquake is mainly developed from bottom to top, when experimentally studying its dynamic characteristics, the bottom infiltration saturation method is selected to be closer to the actual working condition.

[0033] Among them, the traditional bottom infiltration saturation method is to set a buffer zone at the bottom of the model box 1, and configure a permeable plate on the top of the buffer zone. The permeable plate is provided with multiple permeable holes. The permeable plate is also used to support the soil. After the saturated liquid enters the buffer zone, it penetrates into the soil through the permeable holes. Compared with the traditional permeable plate, the saturated liquid infiltration component 3 used in this embodiment has multiple longitudinal infiltration pipes 31 and transverse infiltration pipes 32, which can be flexibly combined and utilized, are not restricted by the size of the test specimen, can be well adapted to model boxes 1 of different shapes and sizes, and can be reused many times. In addition, soil particles will inevitably enter the saturated liquid infiltration component 3 during the test. This saturated liquid infiltration component 3 in this embodiment is detachable, easy to clean, and has no risk of plugging. Furthermore, the longitudinal infiltration pipe 31 and the transverse infiltration pipe 32 are both provided with holes 33 along the body, which maximizes the infiltration area to reduce the impact disturbance of hydraulic pressure on the surrounding soil. The use of geotextile filter cloth wrapping is not only used to block soil particles, but also plays a certain role in reducing the impact on the surrounding soil. It is also possible to provide cavities 33 only on the lower sides of the longitudinal infiltration pipe 31 and the transverse infiltration pipe 32 to prevent the saturated liquid from directly impacting the soil.

[0034] In this embodiment, Figure 1 , 2 As shown, the vacuum pump assembly 2 may include a vacuum pump 21, which is connected to the model box 1 via a vacuum pump tube 22. The vacuum pump 21 is provided with a pressure gauge 23 and an external air pressure valve 24 for controlling whether the vacuum pump tube 22 is connected to the outside.

[0035] The soil sample is saturated based on the device of this embodiment, which specifically includes the following steps:

[0036] Step S1: Sample preparation. The mass of dry sand, rubber particles, water and clay is calculated according to the different soil volume ratios, rubber particle contents and sample moisture content set in the test plan, and the total mass of dry rubber lightweight mixed sand is divided into three parts, and samples are taken separately, water is added and mixed.

[0037] In one example, a mixture of sand and rubber particles was used as the model soil for the test. The total height of the soil sample was set to 50 cm. The required amounts of sand, rubber particles and clay were calculated based on a volume ratio of 3:1 between the mixed soil and the surface clay and a 10% rubber particle content. Before the test, it was found that the optimal sample moisture content under this condition was 5%.

[0038] Step S2: compact in three layers. Pour this part of uniform rubber lightweight mixed sand into the model box 1 and compact it to a given height in sequence. At this time, the liquid inlet and outlet of the model box 1 are closed. After each layer is compacted to the allowable range of the standard value, in order to avoid the appearance of weak surfaces at the junction of the soil layers, the surface of the compacted soil layer is scraped before the next layer is filled. After the rubber lightweight mixed soil layer is filled and compacted in layers, a clay layer about one-third the thickness of the mixed soil layer is continued to be filled on the mixed soil layer to simulate the vertical composition structure of the real road.

[0039] Step S3: Vacuuming. After all soil layers are placed, the sealing cover on the top of the model box 1 is closed, and vacuuming is performed in the model box 1 for 2 hours according to the test plan through the vacuuming assembly 2, and at this time, the liquid inlet and outlet of the model box 1 are kept closed.

[0040] Step S4: Saturation infiltration: After the vacuuming is completed, the vacuum pump 21 is turned off, and the rubber mixed soil 100 in the model box 1 is saturated and infiltrated through the saturated liquid chamber 4 .

[0041] Embodiment 2

[0042] Based on the first embodiment, Figure 1 As shown, the bottom of the saturated liquid chamber 4 is connected to the saturated liquid permeation component 3 through the model box liquid inlet pipe 5, and the top is provided with an air pressure control component 6 for controlling the air pressure therein.

[0043] Specifically, the air pressure control component 6 is set, and the speed of penetration can be accurately controlled by the air pressure difference between the saturated liquid chamber 4 and the model box 1. In step S4, the specific operation of saturated penetration is to adjust the air pressure control component 6 in the saturated liquid chamber 4 according to the test requirements by comparing the reading of the pressure gauge 23 in the model box 1 at this time to set the air pressure value in the saturated liquid chamber 4 to be a value based on the reading of the pressure gauge in the model box 1 at this time plus a value, which is determined according to the specific situation, and is 20kPa in one example, so as to control the speed of saturated liquid entering the model box 1. After the setting is completed, the valve on the liquid inlet pipe 5 of the model box is opened to start the saturated liquid infiltration. When the saturated liquid level exceeds the model soil by 10cm, the valve on the liquid inlet pipe 5 of the model box is closed and the external air pressure valve 24 is opened. After the internal and external air pressures are consistent, the sealing cover plate on the top of the model box 1 can be opened to carry out the model test.

[0044] like Figure 1 As shown, the air pressure control assembly 6 includes an air bag 61 placed in the saturated liquid chamber 4 and located above the liquid surface, and an air compressor 63 connected to the air bag 61 through an air pressure control pipe 62, and the air pressure control pipe 62 is equipped with a pressure gauge 64.

[0045] The pressure control component 6 of this structure can reduce as much as possible the amount of gas that is pressed into the saturated liquid by high pressure because the air bag 61 is provided.

[0046] Embodiment 3

[0047] On the basis of Example 1 or Example 2, Figure 1 As shown, the rubber-mixed soil model test saturation device also includes a liquid collecting tank 7. A model box liquid outlet pipe 8 is provided at the bottom of the model box 1. The liquid collecting tank 7 is used to receive the liquid discharged from the model box liquid outlet pipe 8.

[0048] Specifically, after the model test is completed, the liquid in the model box 1 can be recovered by using the liquid collecting pool 7 .

[0049] In this embodiment, the soil sample is saturated, and the steps further include:

[0050] Step S5, liquid recovery. After the model test is finished, the valve on the model box liquid outlet pipe 8 is opened, and due to gravity, the liquid in the model box 1 can freely flow into the liquid collecting tank 7 through the model box liquid outlet pipe 8.

[0051] Embodiment 4

[0052] Based on the third embodiment, Figure 1 As shown, the rubber mixed soil model test saturation device also includes a liquid pump 9 and a distillation saturation component 10, the inlet of the liquid pump 9 is connected to the liquid collecting tank 7, the outlet is connected to the inlet of the distillation saturation component 10, and the outlet of the distillation saturation component 10 is connected to the saturated liquid chamber 4.

[0053] When a certain amount of liquid is collected in the liquid collecting tank 7, the valves of the liquid pump 9 and the distillation saturation component 10 are opened, and the liquid after the test is reconstituted into a saturated liquid through the distillation technology and pumped back into the saturated liquid chamber 4 for standby use.

[0054] This embodiment selects the combined liquid pump 9 and distillation technology to recycle the experimental materials. The unsaturated liquid after the test is reconstituted into saturated liquid and sent back to the saturated liquid chamber 4 for reuse, which can avoid the waste of a large amount of highly saturated liquid and save the cost of preparing new saturated liquid. It is a green, energy-saving and environmentally friendly method of use.

[0055] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A saturation device for rubber-mixed soil model test, characterized in that: include: A model box (1) for placing rubber mixed soil (100); A vacuum pumping assembly (2) is used to perform a vacuum pumping operation on the inside of the model box (1) from the top of the model box (1); The saturated liquid infiltration assembly (3) comprises a plurality of longitudinal infiltration pipes (31) and a plurality of transverse infiltration pipes (32) which are laid on the bottom of the model box (1) and together form a grid, wherein the longitudinal infiltration pipes (31) and the transverse infiltration pipes (32) are both provided with a plurality of holes (33) for water discharge and are both wrapped with geotextile filter cloth; The saturated liquid chamber (4) is connected to the saturated liquid permeation component (3) and is used to supply saturated liquid to the saturated liquid permeation component (3).

2. The rubber-mixed soil model test saturation device according to claim 1, characterized in that: The longitudinal permeation pipe (31) and the transverse permeation pipe (32) are collectively referred to as permeation pipes, and the intersecting permeation pipes are connected via pipe joints (34).

3. The rubber-mixed soil model test saturation device according to claim 1, characterized in that: The bottom of the saturated liquid chamber (4) is connected to the saturated liquid permeation component (3) through a model box liquid inlet pipe (5), and a gas pressure control component (6) for controlling the gas pressure therein is arranged on the top.

4. The rubber-mixed soil model test saturation device according to claim 3, characterized in that: The air pressure control assembly (6) comprises an air bag (61) placed in the saturated liquid chamber (4) and located above the liquid surface, and an air compressor (63) connected to the air bag (61) through an air pressure control pipe (62), and the air pressure control pipe (62) is equipped with an air pressure gauge (64).

5. The rubber-mixed soil model test saturation device according to claim 1, characterized in that: It also comprises a liquid collecting pool (7), a model box liquid outlet pipe (8) is arranged at the bottom of the model box (1), and the liquid collecting pool (7) is used to receive the liquid discharged from the model box liquid outlet pipe (8).

6. The rubber-mixed soil model test saturation device according to claim 5, characterized in that: It also includes a liquid pump (9) and a distillation saturation component (10), wherein the inlet of the liquid pump (9) is connected to the liquid collecting tank (7), the outlet is connected to the inlet of the distillation saturation component (10), and the outlet of the distillation saturation component (10) is connected to the saturated liquid chamber (4).

7. The rubber-mixed soil model test saturation device according to claim 1, characterized in that: The vacuum pump assembly (2) comprises a vacuum pump (21), the vacuum pump (21) is connected to the model box (1) via a vacuum pipe (22), and the vacuum pipe (22) is provided with a pressure gauge (23) and an external air pressure valve (24) for controlling whether the vacuum pipe (22) is connected to the outside.

8. The rubber-mixed soil model test saturation device according to claim 1, characterized in that: The longitudinal permeation pipe (31) and the transverse permeation pipe (32) are both provided with a plurality of holes (33) along their circumferences.

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