CN116754408A - Dynamic load-erosion coupling action slag-down roadbed response field evolution test system - Google Patents

Dynamic load-erosion coupling action slag-down roadbed response field evolution test system Download PDF

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Publication number
CN116754408A
CN116754408A CN202310716450.XA CN202310716450A CN116754408A CN 116754408 A CN116754408 A CN 116754408A CN 202310716450 A CN202310716450 A CN 202310716450A CN 116754408 A CN116754408 A CN 116754408A
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roadbed
main body
model box
dynamic load
slag
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Inventor
张玲
陈昀灏
彭文哲
谭景鹏
高琼
史雅倩
刘钟书
彭芯钰
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Hunan University
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Hunan University
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00—Testing foundations or foundation structures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082—Investigating permeability by forcing a fluid through a sample
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/42—Road-making materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0005—Repeated or cyclic
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0044—Pneumatic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/005—Electromagnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0236—Other environments
    • G01N2203/024—Corrosive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0236—Other environments
    • G01N2203/0242—With circulation of a fluid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration

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Abstract

The application discloses a system for testing evolution of a slag-down roadbed response field under the action of dynamic load-erosion coupling, which comprises the following components: the roadbed model box comprises a roadbed model box body, a power loading system, a water supply system, a drainage soil collecting system, a signal acquisition system and a particle migration tracking system. The beneficial effects of the application are as follows: the synchronous application of the cyclic load and the seepage field can be realized; the application of various amplitude-frequency combined cyclic loads can be realized, and the amplitude and the frequency can be accurately controlled by a force-sensitive sensor; the method can carry out integral model test research on roadbed particle crushing evolution and accumulated plastic deformation characteristics, fine particle and moisture dynamic migration paths and roadbed internal response field distribution under the action of dynamic load-seepage coupling, and further explore the degradation mechanism and evolution process of the service performance of the slag-down roadbed under the action of dynamic load-seepage coupling.

Description

Dynamic load-erosion coupling action slag-down roadbed response field evolution test system
Technical Field
The application relates to the technical field of traffic geotechnical engineering, in particular to a slag-down roadbed response field evolution test system under the action of dynamic load-erosion coupling.
Background
In the construction process of highways, the main source of the filler is a great amount of slag generated by stone excavation and tunnel abandon. The slag filler has the advantages of high strength, high compaction density, small sedimentation deformation, strong water permeability, high scouring resistance, capability of nearby materials and the like, and the slag is used as the embankment filler, so that the problem of land occupation pollution of waste soil can be effectively solved, and the slag filler has great significance in reducing the consumption and sustainable development of the whole social resource.
However, when the downed slag roadbed is in service, typical roadbed diseases such as slope instability, roadbed slump, uneven roadbed settlement and the like usually occur, and the main reasons are as follows: as a breakable medium-strong weathered mudstone downed slag, the grain composition and the internal structure of the filler are key to influence the mechanical property and stability of the medium-strong weathered mudstone downed slag, and the cyclic dynamic load effect and the heavy rainfall erosion effect of a vehicle are important factors for changing the grading and structure of the downed slag filler, thereby causing the deterioration of the service performance of a downed slag roadbed.
In order to effectively prevent and cope with direct or indirect disasters caused by the risk of the downed slag soil and stone roadbed due to the coupling effect of cyclic dynamic load and heavy rainfall infiltration, the characteristics of broken evolution and accumulated plastic deformation of downed slag particles due to the cyclic dynamic load are further explored, the characteristics analysis of the moisture migration and fine particle migration space-time distribution of the unsaturated downed slag roadbed under the heavy rainfall infiltration effect of a complex seepage path is summarized, and the evolution process of the degradation of the service performance of the downed slag roadbed under the coupling effect of dynamic load-infiltration is theoretical guarantee of the design and maintenance opportunity determination of the downed slag roadbed.
The development of test research is the most intuitive and effective approach, but most of the current tests design test devices based on a single influence factor of dynamic load or seepage, and test systems designed for dynamic load-seepage coupling are fresh. On the other hand, the current seepage erosion test is usually carried out in a cylindrical seepage meter, and only the seepage erosion characteristics of the unit body can be analyzed; likewise, cyclic loading tests are typically developed in a cylindrical shape by a dynamic triaxial apparatus, both of which are difficult to derive the general rules of the model test.
Therefore, development of a visual research test system for unsaturated slag-down roadbed response field evolution under the action of dynamic load-erosion coupling is needed.
Disclosure of Invention
The embodiment of the application aims to provide a system for testing evolution of a slag-down subgrade response field under the action of dynamic load-erosion coupling, which can control inlet and outlet water heads, effectively adjust an erosion path and flexibly simulate an erosion process; the multi-stage variable-frequency cyclic loading can be realized, and the simulation of various traffic loads is realized; a plurality of sensors are arranged in the sensor, so that the distribution evolution rule of an internal stress field and a displacement field can be intuitively obtained; meanwhile, the migration path of the fine particles can be tracked in real time, so that at least one technical problem related to the background technology can be solved.
In order to solve the technical problems, the application is realized as follows:
the embodiment of the application provides a system for testing the evolution of a slag-down roadbed response field under the action of dynamic load-erosion coupling, which comprises the following components: the system comprises a roadbed model box main body, a power loading system for applying vibration to the roadbed model box main body, a water supply system for supplying water to the roadbed model box main body, a water and soil drainage and collection system for being connected with the roadbed model box main body and used for draining and collecting soil, a signal acquisition system for acquiring various information of the roadbed model box main body and a particle migration tracking system for tracking dynamic migration paths of fine particles and water, wherein,
holes for discharging fine particles and water flow are formed in the bottom of the roadbed model box body in a penetrating mode;
the drainage soil collecting system comprises a steel bracket for supporting the roadbed model box main body and a double-layer iron box welded on the steel bracket and positioned right below the holes, wherein the double-layer iron box comprises an upper-layer iron box which is detachable and used for collecting fine particles flowing out of the roadbed model box main body and a lower-layer iron box positioned below the upper-layer iron box, a plurality of first round holes are formed in the bottom of the upper-layer iron box in a penetrating manner, a filter screen is paved, and the filter screen is tightly attached to the bottom and the side wall of the upper-layer iron box; the bottom of lower floor's indisputable box runs through and is equipped with the second round hole that is used for installing the drain pipe.
Optionally, a foam board for weakening the stress wave reflection phenomenon of the upper cyclic load at the bottom is laid at the bottom of the roadbed model box main body.
Optionally, the inner side wall of the roadbed model box body is coated with vaseline and is adhered with a tetrafluoroethylene membrane for reducing friction resistance between soil and the side wall and reflection of dynamic waves.
Optionally, the loading system includes the bottom plate that is used for bearing the steel bracket, erect set up in support post on the bottom plate, install in the support post top and be located the loading frame roof of road bed model case main part top, install in vibrating motor on the loading frame roof, with the converter that vibrating motor is connected, install in circular rigidity loading plate on the road bed model case main part, connect circular rigidity loading plate with the loading pole of vibrating motor output and install in force sensor on the loading pole.
Optionally, the loading frame top plate is fixed on the supporting upright post through two groups of compression springs with the same rigidity coefficient, and the counter-force frame is adopted to apply axial elastic constraint.
Optionally, the water supply system comprises a water storage tank, a pressure controller for controlling the water pressure of the water storage tank and a water guide pipe for connecting the water storage tank and the roadbed model box main body.
Optionally, the pressure controller comprises an air pump, a conduit connecting the air pump and the water storage tank, and a pressure control valve arranged on the conduit.
Optionally, the signal acquisition system includes install in laser displacement meter in the road bed model box main part and bury in soil pressure cell, pore water pressure gauge and the tensiometer in the inside soil body of road bed model box main part.
Optionally, the particle migration tracking system adopts a 3D-DIC system, and comprises a high-speed camera, a high-precision measuring head, a synchronous trigger, measuring software, a calibration plate and a graphic workstation.
Optionally, the force sensor is composed of a DYLY-108 type weighing sensor and a CYY-JSD01 acceleration sensor.
The beneficial effects of the application are as follows:
1. the unsaturated downed slag roadbed response field evolution visual research test system provided by the application can realize synchronous application of cyclic load and seepage field. The application can realize the application of various amplitude-frequency combined cyclic loads, and the amplitude and the frequency can be precisely controlled by the force-sensitive sensor; likewise, the seepage velocity can be accurately regulated by the pressure-controllable valve, and the influence of various combined working conditions can be explored flexibly and variably.
2. The application can carry out integral model test research on roadbed particle crushing evolution and accumulated plastic deformation characteristics, fine particle and moisture dynamic migration paths and roadbed internal response field distribution under the action of dynamic load-seepage coupling, and further explore the degradation mechanism and evolution process of the service performance of the slag-down roadbed under the action of dynamic load-seepage coupling.
3. The test system provided by the application has the advantages of simple structure, convenience in operation and strong practicability, and the experimental flow is greatly simplified.
Drawings
For a clearer description of the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic diagram of the overall structure of a test system according to an embodiment of the present application;
FIG. 2 is a grading curve of a roadbed model filling provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of a signal acquisition system according to an embodiment of the present application;
fig. 4 is a schematic diagram of a particle migration tracking system according to an embodiment of the present application.
1, a roadbed model box main body; 2. a power loading system; 3. a water supply system; 4. a drainage and soil collection system; 5. a signal acquisition system; 6. a particle migration tracking system; 7. angle steel; 8. tempered glass; 9. a steel plate; 10. a foam board; 11. a tetrafluoroethylene membrane; 12. a rectangular movable plate; 13. a round hole; 14. a hole; 15. a circular truncated cone ring; 16. a loading rack top plate; 17. a bottom plate; 18. a support column; 19. a vibration motor; 20. a reaction frame; 21. a compression spring; 22. a frequency converter; 23. a loading rod; 24. a force-sensitive sensor; 25. a circular rigid load plate; 26. a water storage tank; 27. a pressure controller; 28. a water conduit; 29. a first water inlet; 30. a second water inlet; 31. an air inlet; 32. an exhaust port; 33. a water injection pressure gauge; 34. a water outlet; 35. a water outlet; 36. a communicating vessel; 37. an air pump; 38. a pressure control valve; 39. a conduit; 40. a steel bracket; 41. a double-layer iron box; 42. a filter screen; 43. a first round hole; 44. a drain pipe; 45. a laser displacement meter; 46. a soil pressure box; 47. a pore water pressure gauge; 48. a tensiometer; 49. a dynamic signal acquisition module; 50. a computer terminal; 51. a high-speed camera; 52. a high-precision measuring head; 53. a synchronous trigger; 54. a calibration plate; 56. a graphics workstation; 57. DYLY-108 type weighing sensor; 58. CYY-JSD01 acceleration sensor; 59. a converter; 60. a water dividing pipe.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The following describes a detailed description of a slag-down roadbed response field evolution test system under the action of dynamic load-erosion coupling provided by the embodiment of the application through a specific embodiment and an application scene thereof with reference to fig. 1-4.
Referring to fig. 1, the system for testing evolution of a slag-down roadbed response field under the action of dynamic load-erosion coupling provided by the embodiment of the application comprises: a roadbed model box body 1, a power loading system 2 for applying vibration to the roadbed model box body 1, a water supply system 3 for supplying water to the roadbed model box body 1, a drainage and soil collection system 4 for connecting with the roadbed model box body 1 and for draining and collecting soil, a signal acquisition system 5 for acquiring various information of the roadbed model box body 1, and a particle migration tracking system for tracking the dynamic migration paths of fine particles and water fluid, wherein,
the roadbed model box main body 1 is formed by welding angle steel 7 with the thickness of 5mm, surrounded by toughened glass 8 with the thickness of 10mm, and a bottom plate is welded by steel plate 9 with the thickness of 10mm, wherein the size of the roadbed model box main body 1 is 150cm (length) ×80cm (width) ×100cm (height).
Foam boards 10 with the thickness of 1.5cm are paved at the bottom of the roadbed model box main body 1 and are used for weakening the stress wave reflection phenomenon of the upper circulating load at the bottom.
The inner side wall of the roadbed model box main body 1 is coated with vaseline and is stuck with a tetrafluoroethylene membrane 11 so as to reduce friction force between soil and the side wall and reflection of dynamic waves.
Two rectangular movable plates 12 with the length of 80cm and the width of 60cm are arranged on the upper part of the roadbed model box main body 1 and can move left and right.
For facilitating the sensor lead-out and the installation and fixation of the laser displacement meter, the left side wall, the rear side wall and the movable cover plate of the roadbed model box main body 1 are provided with a plurality of round holes 13.
4 holes 14 with the diameter of 5cm and the distance of 15cm are formed in the position, 10cm away from the left side wall, of the bottom steel plate of the roadbed model box main body 1, and circular table rings 15 with the diameter of 2cm of an upper bottom circle, the diameter of 5cm of a lower bottom circle and the height of 10cm are welded on the holes 14 and are used for discharging fine particles and water flow in the model box.
In order to intuitively observe the migration paths of fine particles, a coarse particle framework of the filled soil in the roadbed model box main body 1 adopts black medium-strong weathered mudstone, a fine particle soil component adopts red soil, and the coarse particle framework and the red soil are fully and uniformly mixed and compacted and filled according to a grading curve shown in the figure 2.
The loading system 2 comprises a loading frame top plate 16, a bottom plate 17, a support column 18, a vibration motor 19 and a reaction frame 20. The loading frame top plate 16 is fixed on the supporting upright 18 through two groups of compression springs 21 with the same rigidity coefficient, and the reaction frame 20 is adopted to apply axial elastic constraint.
The vibration motor 19 is installed at the center of the loading frame top plate 16, and the output exciting force intensity and the vibration frequency of the vibration motor 19 are accurately controlled through the frequency converter 22.
Specifically, the vibration motor 19 is a MV300/3 type three-phase ac centrifugal vibration motor, and the frequency converter 22 is a VFD750 type frequency converter.
The loading system 2 further comprises a loading rod 23, a force sensor 24 and a circular rigid loading plate 25, wherein the force sensor 24 is used to measure the output intensity and frequency of the cyclic dynamic load.
Specifically, the force sensor 24 is composed of a DYLY-108 type weighing sensor 57 and a CYY-JSD01 acceleration sensor 58.
The water supply system 3 comprises a water reservoir 26, a pressure controller 27 and a water conduit 28. The upper part of the water storage tank 26 is provided with a first water inlet 29, a second water inlet 30, an air inlet 31, an air outlet 32 and a water injection pressure gauge 33; a water outlet 34 and a water outlet 35 are arranged at the lower part of the water storage tank 26; the outside of the water storage tank 26 is provided with a communicating vessel 36 for monitoring the water level height inside the water storage tank 26 in real time.
Wherein the first water inlet 29 is used for injecting water into the water storage tank; the second water inlet 30 is communicated with the water outlet 34, and the air inlet 31 is communicated with the pressure controller 27; the exhaust port 32 and the drain port 35 are used for exhaust and drainage of the water storage tank.
The diameter of the water guide pipe 28 is 1cm, the water guide pipe is communicated with the converter 59, the converter 59 is communicated with 9 sub-water guide pipes 60,9 with the diameter of 0.5cm, and the sub-water guide pipes 60 are buried in different positions of the right side slope of the roadbed model box main body 1 in a 3-layer manner.
It is further described that the pressure controller 27 includes an air pump 37, a pressure control valve 38 and a conduit 39, the air pump 37 is communicated with the air inlet 31 of the water storage tank 26 through the conduit 39, and the pressure control valve 38 is installed on the conduit 39 and is used for adjusting the air supply pressure of the air pump 37, thereby adjusting the internal pressure of the water storage tank 26 and controlling the water flow rate.
The drainage soil collecting system 4 comprises a steel bracket 40 for supporting the roadbed model box main body 1 and a double-layer iron box 41 welded on the steel bracket 40 and positioned right below the hole 14, the double-layer iron box 41 comprises an upper-layer iron box which is detachable and used for collecting fine particles flowing out of the roadbed model box main body 1 and a lower-layer iron box positioned below the upper-layer iron box, a plurality of first round holes 43 are formed in the bottom of the upper-layer iron box in a penetrating manner, a filter screen 42 is paved, and the filter screen 42 is tightly attached to the bottom and the side wall of the upper-layer iron box; the bottom of the lower-layer iron box is provided with a second round hole (not numbered) for installing a drain pipe 44 in a penetrating mode, and the drain pipe 44 is connected with a test field sewer.
Referring to fig. 3 again, the signal acquisition system 5 includes a laser displacement meter 45 mounted on the left side wall and the upper movable plate of the roadbed model box body 1, a soil pressure box 46 embedded in the soil, a pore water pressure meter 47, a tensiometer 48, a dynamic signal acquisition module 49 and a computer 50.
The laser displacement meter 45 is used for monitoring the deformation of the upper part and the left side slope of the roadbed model box main body 1. The soil pressure box 46 is used for monitoring the dynamic stress time course change in the roadbed model box main body 1 under the cyclic loading. The pore water pressure gauge 47 and the tension gauge 48 are used for monitoring the internal pore water pressure and the water content change characteristics of the roadbed model box main body 1 under seepage erosion in real time. The dynamic acquisition module 49 is used for collecting dynamic signals of each sensor and transmitting the dynamic signals to the computer 50 for processing.
And in combination with the figure 4, the particle migration tracking system adopts a 3D-DIC (Digital Image Correlation) system, and realizes displacement and strain measurement in a three-dimensional space by combining a binocular stereoscopic vision system and a DIC technology. The 3D-DIC system consists of two high-speed cameras 51, a high-precision measuring head 52, a synchronization trigger 53, measuring software 54, a calibration plate 55 and a graphics workstation 56. The system supports instantaneous measurement of data such as the spatial three-dimensional coordinates of objects, displacement and strain under the action of load, and can realize the tracking of the dynamic migration paths of fine particles and water.
The beneficial effects of the application are as follows:
1. the unsaturated downed slag roadbed response field evolution visual research test system provided by the application can realize synchronous application of cyclic load and seepage field. The application can realize the application of various amplitude-frequency combined cyclic loads, and the amplitude and the frequency can be precisely controlled by the force-sensitive sensor; likewise, the seepage velocity can be accurately regulated by the pressure-controllable valve, and the influence of various combined working conditions can be explored flexibly and variably.
2. The application can carry out integral model test research on roadbed particle crushing evolution and accumulated plastic deformation characteristics, fine particle and moisture dynamic migration paths and roadbed internal response field distribution under the action of dynamic load-seepage coupling, and further explore the degradation mechanism and evolution process of the service performance of the slag-down roadbed under the action of dynamic load-seepage coupling.
3. The test system provided by the application has the advantages of simple structure, convenience in operation and strong practicability, and the experimental flow is greatly simplified.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Furthermore, it should be noted that the methods and scope of embodiments of the present application are not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims (10)

1. The utility model provides a dynamic load-ooze and corrode system of evolving test of response field of sediment roadbed down under coupling effect which characterized in that includes: the system comprises a roadbed model box main body, a power loading system for applying vibration to the roadbed model box main body, a water supply system for supplying water to the roadbed model box main body, a water and soil drainage and collection system for being connected with the roadbed model box main body and used for draining and collecting soil, a signal acquisition system for acquiring various information of the roadbed model box main body and a particle migration tracking system for tracking dynamic migration paths of fine particles and water, wherein,
holes for discharging fine particles and water flow are formed in the bottom of the roadbed model box body in a penetrating mode;
the drainage soil collecting system comprises a steel bracket for supporting the roadbed model box main body and a double-layer iron box welded on the steel bracket and positioned right below the holes, wherein the double-layer iron box comprises an upper-layer iron box which is detachable and used for collecting fine particles flowing out of the roadbed model box main body and a lower-layer iron box positioned below the upper-layer iron box, a plurality of first round holes are formed in the bottom of the upper-layer iron box in a penetrating manner, a filter screen is paved, and the filter screen is tightly attached to the bottom and the side wall of the upper-layer iron box; the bottom of lower floor's indisputable box runs through and is equipped with the second round hole that is used for installing the drain pipe.
2. The system for performing an evolution test on a slag-down subgrade response field under the action of dynamic load-erosion coupling according to claim 1, wherein a foam board for weakening the stress wave reflection phenomenon of the upper cyclic load at the bottom is laid at the bottom of the subgrade model box main body.
3. The system for testing evolution of a slag-down subgrade response field under the action of dynamic load-erosion coupling according to claim 1 or 2, wherein the inner side wall of the subgrade model box main body is coated with vaseline and is adhered with a tetrafluoroethylene film for reducing friction force between soil and the side wall and reflection of dynamic waves.
4. The system of claim 1, wherein the loading system comprises a base plate for bearing the steel bracket, a support column vertically arranged on the base plate, a loading frame top plate arranged on the top of the support column and positioned above the roadbed model box main body, a vibration motor arranged on the loading frame top plate, a frequency converter connected with the vibration motor, a circular rigid loading plate arranged on the roadbed model box main body, a loading rod for connecting the circular rigid loading plate with the output end of the vibration motor, and a force sensor arranged on the loading rod.
5. The system for performing a dynamic load-erosion coupling reaction field evolution test on a slag-down subgrade according to claim 4, wherein the top plate of the loading frame is fixed on the supporting upright post through two groups of compression springs with the same rigidity coefficient, and a counterforce frame is adopted to apply axial elastic constraint.
6. The system for performing a dynamic load-erosion coupling reaction on a downed slag subgrade response field evolution test according to claim 1, wherein said water supply system comprises a water storage tank, a pressure controller for controlling the water pressure of said water storage tank, and a water conduit connecting said water storage tank with said subgrade model box body.
7. The system of claim 6, wherein the pressure controller comprises an air pump, a conduit connecting the air pump and the water storage tank, and a pressure control valve mounted on the conduit.
8. The system for testing the evolution of the response field of the downed slag roadbed under the action of dynamic load-erosion coupling according to claim 1, wherein the signal acquisition system comprises a laser displacement meter arranged in a roadbed model box main body, and a soil pressure box, a pore water pressure meter and a tensiometer which are buried in soil in the roadbed model box main body.
9. The system for performing an evolution test on a slag-down subgrade response field under the action of dynamic load-erosion coupling according to claim 1, wherein the particle migration tracking system adopts a 3D-DIC system and comprises a high-speed camera, a high-precision measuring head, a synchronous trigger, measuring software, a calibration plate and a graphic workstation.
10. The system for performing a dynamic load-erosion coupling reaction on a slag-down subgrade response field evolution test under the dynamic load-erosion coupling action according to claim 4, wherein the force sensor consists of a DYLY-108 type weighing sensor and a CYY-JSD01 acceleration sensor.
CN202310716450.XA 2023-06-16 2023-06-16 Dynamic load-erosion coupling action slag-down roadbed response field evolution test system Pending CN116754408A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117470695A (en) * 2023-12-26 2024-01-30 湖南大学 Roadbed service state assessment method and system under dynamic load-dry-wet cycle coupling effect

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117470695A (en) * 2023-12-26 2024-01-30 湖南大学 Roadbed service state assessment method and system under dynamic load-dry-wet cycle coupling effect

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