Static and dynamic test device for quantitative research on road underground disease body

Abstract

The utility model provides a static and dynamic test device for quantitative research of road underground disease bodies, which comprises a road surface layer structure, a simulated roadbed spring array, a reaction frame, a hydraulic servo loading system, a reaction wall and a mechanical boundary loading assembly, the device is composed of a plurality of spring elements according to a specific arrangement mode, so that underground disease bodies of different scales and different types under a road can be simulated; the hydraulic servo loading system is fixedly arranged on the reaction frame and is used for applying a vertical load to the road surface layer structure; the mechanical boundary loading assembly is arranged between the reaction wall and the road surface layer structure. According to the utility model, various factors related to road collapse, such as geological conditions, underground disease body types, scales, pavement structure types, vehicle load forms and the like, are all simulated, so that the mechanism and rule from road cavity development to collapse under different conditions can be comprehensively and deeply understood and researched.

Description

Technical Field

[0001] The utility model relates to the technical field of collapse risk assessment of underground diseased bodies in roads, in particular to a static and dynamic test device for quantitative research of underground diseased bodies in roads. Background Art

[0002] Road collapse involves many factors, including geological conditions, underground disease body type, scale, pavement structure type, vehicle load form, etc. It is a complex multi-factor coupling problem. A systematic and in-depth understanding and study of its failure mode and mechanical mechanism is one of the key foundations for assessing and warning the risk of road collapse, and is also an important basis for formulating scientific repair plans and preventive measures.

[0003] Existing research has revealed the mechanism and law of road cavity development and collapse to a certain extent, laying a good foundation for the development of the profession and industry. However, overall, there are still some obvious deficiencies in current research, which are mainly manifested in the following aspects:

[0004] Biased research focus: When studying the road collapse risk of underground disease bodies, some studies focus too much on a specific type of underground disease body and ignore the impact of other types of underground disease bodies on road stability. This may lead to one-sided research results and fail to fully assess the diversity and complexity of road collapse risks.

[0005] Incomplete data collection: Sometimes researchers may not be able to obtain sufficiently comprehensive underground disease body data, or rely only on limited case study data. This will lead to limitations in research results and fail to fully reflect the impact of underground disease bodies on road collapse risks in different regions and under different environmental conditions.

[0006] Limitations of research methods: Different research methods have different limitations for the study of road collapse risk of underground disease bodies. Some methods may only consider the problem from one aspect and cannot fully reveal the complex relationship between underground disease bodies and road collapse risk.

[0007] The main reason for the above situation is the lack of a complete set of experimental equipment. The existing experimental equipment cannot simulate and quantify underground disease bodies well, resulting in a certain one-sidedness of the research results. Utility Model Content

[0008] Based on this, the main purpose of the utility model is to provide a static and dynamic test device for quantitative research on underground road diseases, so as to reliably simulate and quantify underground diseases, so as to fully and deeply understand and study the mechanism and law of road cavity development and collapse.

[0009] In order to achieve the above-mentioned purpose, the utility model provides a static and dynamic test device for quantitative research of underground road disease bodies, comprising:

[0010] Road surface structure;

[0011] A simulated roadbed spring array is used to support the road surface structure, and the simulated roadbed spring array is composed of a plurality of spring elements to simulate underground disease bodies of different sizes and types under the road;

[0012] reaction frame;

[0013] A hydraulic servo loading system is fixedly arranged on the reaction frame, and the hydraulic servo loading system is erected above the road surface structure through the reaction frame, and the hydraulic servo loading system is used to push against the top of the road surface structure to apply a vertical load to the road surface structure;

[0014] A reaction wall is fixedly arranged around the road surface structure and is spaced apart from the road surface structure; and

[0015] A mechanical boundary loading component is arranged between the reaction wall and the road surface structure, one end of the mechanical boundary loading component is fixed to the reaction wall, and the other end of the mechanical boundary loading component can abut against the outer periphery of the road surface structure to apply a lateral load to the road surface structure.

[0016] Preferably, the road surface structure is a concrete pavement, an asphalt pavement or a mixed pavement structure.

[0017] Preferably, the underground diseased body includes cavities, voids and loose bodies. The cavities and voids are simulated by removing the spring elements at corresponding positions, and the loose bodies are simulated by replacing the original spring elements with the spring elements having lower elastic stiffness.

[0018] Preferably, the load applied by the hydraulic servo loading system is adjustable. The hydraulic servo loading system can slowly increase the load value at a specific loading rate until the road surface structure is destroyed. The hydraulic servo loading system can also apply a cyclic load in the form of a preset function until the road surface structure is destroyed.

[0019] Preferably, the static and dynamic test device further comprises a test substrate, and the simulated roadbed spring array is arranged on the test substrate; the test substrate is provided with a plurality of grooves, each spring element corresponds to one groove, and each spring element is partially arranged in the corresponding groove.

[0020] Preferably, the spring element includes a first steel plate, a second steel plate and a spring, one end of the spring is fixedly connected to the first steel plate, the other end of the spring is fixedly connected to the second steel plate, the first steel plate is arranged in the corresponding groove, and the second steel plate is used to support the road surface structure.

[0021] Preferably, the elastic stiffness of the spring is selectable to simulate roadbeds with different stiffness; the spring can be partially removed or partially replaced with other specifications of elastic stiffness to simulate different types or geometric profiles of underground diseased bodies.

[0022] Preferably, the first steel plate and the second steel plate are both fixed to the spring by welding. The first steel plate and the second steel plate are square steel plates.

[0023] Preferably, the mechanical boundary loading component includes multiple loading structures, and the multiple loading structures are evenly distributed on the road surface structure. The number of the reaction walls is four, and the four reaction walls are evenly distributed around the road surface structure. Each of the loading structures is arranged between the reaction wall and the road surface structure, and each of the loading structures is used to apply a lateral load to the road surface structure.

[0024] Preferably, the loading structure includes a digital jack and a third steel plate, one end of the digital jack is fixedly disposed on the reaction wall, and the other end of the digital jack is connected to the third steel plate, and the digital jack can drive the third steel plate to move along the axial direction of the digital jack so that the third steel plate can resist the side wall of the road surface structure and apply a lateral load to the road surface structure.

[0025] Preferably, the digital jacks of each loading structure apply loads to the four sides of the road surface structure in a symmetrical loading manner, and slowly increase the value of the digital jack to a specified load to ensure that the spatial position of the road surface structure remains unchanged during the loading process.

[0026] Advantages of the technical solution of the utility model: the road surface structure of the utility model adopts concrete pavement, asphalt pavement or mixed pavement structure, so as to realize the study of underground disease bodies under different road surface structures, the simulated roadbed spring array can simulate different roadbeds and underground disease bodies of different scales and types, the hydraulic servo loading system applies vertical loads, which can simulate vehicle loads on the road surface structure, and the reaction wall and mechanical boundary loading components can apply lateral loads to the road surface structure from all sides to ensure that the horizontal position of the road surface structure remains unchanged, so that the utility model simulates all factors involved in road collapse, such as geological conditions, underground disease body types, scales, pavement structure types, vehicle load forms, etc., and can thus fully and deeply understand and study the mechanism and law of road cavity development and collapse under different conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the devices shown in these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of a static and dynamic test device for quantitative research on underground road disease bodies according to an embodiment;

[0029] Figure 2 It is a partial structural schematic diagram of a static and dynamic test device for quantitative research on underground road disease bodies in one embodiment;

[0030] Figure 3 A schematic diagram of the coordination of a simulated roadbed spring array and a test base plate according to an embodiment;

[0031] Figure 4 is a schematic structural diagram of a spring element according to an embodiment;

[0032] Figure 5 A schematic diagram of a spring element structure with another elastic stiffness according to an embodiment;

[0033] Figure 6 A schematic structural diagram of a spring element with another elastic stiffness according to an embodiment;

[0034] Figure 7 A schematic structural diagram of a test substrate according to an embodiment;

[0035] Among them, 100, road surface structure; 200, simulated roadbed spring array; 210, spring element; 211, first steel plate; 212, second steel plate; 213, spring; 300, reaction frame; 400, hydraulic servo loading system; 500, reaction wall; 600, mechanical boundary loading component; 610, loading structure; 611, digital display jack; 612, third steel plate; 700, test substrate; 710, groove; A, cavity.

[0036] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "first", "second", etc. in the utility model are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes A technical solution, B technical solution, and A and B technical solutions that meet the requirements at the same time; in addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to achieve it. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0039] like Figure 1 and Figure 2As shown, a static and dynamic test device for quantitative research of underground disease bodies in roads includes a road surface structure 100, a simulated roadbed spring array 200, a reaction frame 300, a hydraulic servo loading system 400, a reaction wall 500 and a mechanical boundary loading component 600. The road surface structure 100 is a concrete pavement, asphalt pavement or mixed pavement structure. The simulated roadbed spring array 200 is used to support the road surface structure 100. The simulated roadbed spring array 200 is composed of a plurality of spring elements 210 arranged in a preset manner to simulate underground disease bodies of different sizes and types. The hydraulic servo loading system 400 is fixedly arranged on the reaction frame 300. The hydraulic servo loading system 400 is fixedly arranged on the reaction frame 300. 00 is erected above the road surface structure 100 through a reaction frame 300, and a hydraulic servo loading system 400 is used to push against the top of the road surface structure 100 to apply a vertical load to the road surface structure 100; a reaction wall 500 is fixedly arranged around the road surface structure 100, and there is a gap between the reaction wall 500 and the road surface structure 100, and a mechanical boundary loading component 600 is arranged between the reaction wall 500 and the road surface structure 100, one end of the mechanical boundary loading component 600 is fixed to the reaction wall 500, and the other end of the mechanical boundary loading component 600 can push against the outer periphery of the road surface structure 100 to apply a lateral load to the road surface structure 100.

[0040] The road surface structure 100 of the utility model adopts a concrete pavement, an asphalt pavement or a mixed pavement structure, so as to realize the study of underground disease bodies under different road surface structures 100. The simulated roadbed spring array 200 can simulate different roadbeds and underground disease bodies of different scales and types. The hydraulic servo loading system 400 applies a vertical load and can simulate the vehicle load on the road surface structure 100. The reaction wall 500 and the mechanical boundary loading component 600 can apply a lateral load to the road surface structure 100 from all sides to ensure that the horizontal position of the road surface structure 100 remains unchanged. Therefore, the utility model simulates all the geological conditions involved in road collapse, the type and scale of underground disease bodies, the type of pavement structure, the form of vehicle loads and other factors, and can thus fully and deeply understand and study the mechanism and law of road cavity development and collapse under different conditions.

[0041] Specifically, the hydraulic servo loading system is a precise and flexible loading system that can realize quasi-static loads, fixed waveform cyclic loads and complex load forms (such as vehicle loads or earthquake loads, etc.).

[0042] In this embodiment, the mixed pavement structure refers to a pavement mixed with concrete and asphalt.

[0043] In this embodiment, the reaction frame 300 is arranged near the road surface structure 100. Specifically, the reaction frame 300 includes two vertical beams and a horizontal beam, the horizontal beam is fixedly arranged on the two vertical beams, the two vertical beams are fixedly arranged on the opposite sides of the road surface structure 100, and the horizontal beam is located above the road surface structure 100; the hydraulic servo loading system 400 is fixedly arranged on the horizontal beam, and is erected above the road surface structure 100 through the horizontal beam.

[0044] Specifically, the underground disease body includes a cavity A, a void and a loose body. The cavity A and the void are simulated by removing the spring element 210 at the corresponding position, and the loose body is simulated by replacing the original spring element 210 with a spring element 210 with lower elastic stiffness. Figure 3 As shown by the reference numeral A in the figure. Specifically, the removed or replaced spring elements 210 can freely form any geometric contour, so as to simulate underground disease bodies of various sizes and configurations. Among them, a plurality of spring elements 210 are arranged in a preset manner to simulate underground disease bodies of different sizes and types, that is, loose bodies or voids A are simulated by using spring elements 210 with lower elastic stiffness or removing spring elements 210, and the size of loose bodies or voids A is simulated by using different numbers of spring elements 210 with lower elastic stiffness or removing different numbers of spring elements 210.

[0045] refer to Figures 2 to 4 The static and dynamic test device also includes a test substrate 700 , and the simulated roadbed spring array 200 is arranged on the test substrate 700 .

[0046] refer to Figure 4 The test substrate 700 is provided with a plurality of grooves 710, each spring element 210 corresponds to one groove 710, and each spring element 210 is partially disposed in the corresponding groove 710. In this embodiment, one end of each spring element 210 is disposed in the corresponding groove 710, and the other end supports the road surface structure 100. Specifically, the test substrate 700 is prefabricated with square unit cell grooves 710 whose size matches the spring element 210, so that the spring element 210 can be placed quickly and conveniently.

[0047] refer to Figure 3 and Figure 5 The spring element 210 includes a first steel plate 211, a second steel plate 212 and a spring 213. One end of the spring 213 is fixedly connected to the first steel plate 211, and the other end of the spring 213 is fixedly connected to the second steel plate 212. The first steel plate 211 is arranged in the corresponding groove 710, and the second steel plate 212 is used to support the road surface structure 100. Specifically, the elastic stiffness of the spring 213 is determined according to the roadbed stiffness, so that various different ground conditions can be simulated; Figure 5 , Figure 6 and Figure 7 Springs 213 of different elastic stiffness are illustrated.

[0048] Specifically, the elastic stiffness of the spring 213 can be selected to simulate roadbeds with different stiffness; the spring 213 can be partially removed or partially replaced with other elastic stiffness specifications to simulate different types or geometric profiles of underground disease bodies. Specifically, by removing or replacing the spring element 210 at a specific position, a simulated roadbed spring array 200 containing underground disease bodies is formed.

[0049] refer to Figure 5 The first steel plate 211 and the second steel plate 212 are square steel plates. Specifically, the first steel plate 211 and the second steel plate 212 are both fixed to the spring 213 by welding.

[0050] refer to Figure 2 The mechanical boundary loading component 600 includes a plurality of loading structures 610, and the plurality of loading structures 610 are evenly distributed on the road surface structure 100. There are four reaction walls 500, and the four reaction walls 500 are evenly distributed around the road surface structure 100. Each loading structure 610 is arranged between the reaction wall 500 and the road surface structure 100, and each loading structure 610 is used to apply a lateral load to the road surface structure 100.

[0051] Furthermore, the road surface structure 100 is prefabricated, and the corresponding road surface structure 100 is selected according to the test target and hoisted onto the simulated roadbed spring array 200 .

[0052] refer to Figure 2 The loading structure 610 includes a digital jack 611 and a third steel plate 612. One end of the digital jack 611 is fixedly disposed on the reaction wall 500, and the other end of the digital jack 611 is connected to the third steel plate 612. The digital jack 611 can drive the third steel plate 612 to move along the axial direction of the digital jack 611, so that the third steel plate 612 abuts against the side wall of the road surface structure 100 and applies a lateral load to the road surface structure 100. In this embodiment, the third steel plate 612 is a square steel plate, and the digital jack 611 contacts the road surface structure 100 through the square steel plate. The digital jack 611 is anchored to the reaction wall 500 through anchoring accessories.

[0053] Specifically, a specific force is applied to the digital jack 611 to generate friction force to simulate the shear force at the boundary of the road surface structure 100 when the road surface structure 100 is subjected to an external vertical load, and the load required to be applied by each digital jack 611 is converted through simple mechanics.

[0054] Furthermore, the digital jacks 611 of each loading structure 610 apply loads to the road surface structure 100 in a symmetrical loading manner, and slowly increase the value of the digital jacks 611 to the specified load to ensure that the spatial position of the road surface structure 100 remains unchanged during the loading process. Specifically, symmetrical loading means that when the digital jacks 611 apply loads, the digital jacks 611 symmetrical to the road surface structure 100 keep the same load applied, so that the loads on the road surface structure 100 around the road surface structure 100 cancel each other, thereby ensuring that the spatial position of the road surface structure 100 remains unchanged during the loading process.

[0055] Furthermore, the load applied by the hydraulic servo loading system 400 is adjustable, and the hydraulic servo loading system 400 can slowly increase the load value at a specific loading rate until the road surface structure 100 is destroyed, and record its load time history curve, destruction load value, deformation value and destruction characteristic image. Specifically, the test parameters can be changed, such as stratum stiffness, underground disease body type, underground disease body span, underground disease body area, underground disease body geometric configuration, etc., and then the above installation and loading process is repeated to complete the road structure collapse risk test study of underground disease bodies of different types, sizes and configurations developed in different strata under the action of external static load.

[0056] Specifically, the records are automatically carried out in the system operation interface, and the results can be output after the test; the load-time curve is the load-time curve, and the loading process is that the load increases slowly at a certain increment and a certain rate (the system will record the load value at each moment, and the drawing is the load-time curve) until the road surface is damaged; the damage characteristic image refers to the image of the road surface structure or specimen when it is damaged, which is helpful to study its damage mode (tensile damage, shear damage, etc.).

[0057] Furthermore, the hydraulic servo loading system 400 can also apply a cyclic load in the form of a preset function until the road surface structure 100 is destroyed, and record its load time history curve, number of cycles, deformation value and destruction characteristic image. Specifically, the test parameters can be changed, such as stratum stiffness, type of diseased body, span, area, geometric configuration of diseased body, etc., and then the above installation and loading process can be repeated to complete the long-term service collapse risk test of road structures with different types, sizes and configurations of underground diseased bodies developed in different strata under the cyclic action of vehicle loads.

[0058] Specifically, when applying a cyclic load in the form of a preset function, the preset function may be a sine function or a cosine function. If there is a specific complex load function in existing research, the function can also be directly input into the system, and the system will load according to the function.

[0059] The above are only preferred embodiments of the utility model, and the patent scope of the utility model is not limited thereto. All equivalent device transformations made by using the contents of the utility model specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A static and dynamic test device for quantitative research of underground road damage, characterized in that: include: The road surface structure is a concrete pavement, asphalt pavement or mixed pavement structure; A simulated roadbed spring array is used to support the road surface structure, and the simulated roadbed spring array is composed of a plurality of spring elements to simulate underground disease bodies of different sizes and types; reaction frame; A hydraulic servo loading system is fixedly arranged on the reaction frame, and the hydraulic servo loading system is erected above the road surface structure through the reaction frame, and the hydraulic servo loading system is used to push against the top of the road surface structure to apply a vertical load to the road surface structure; A reaction wall is fixedly arranged around the road surface structure and is spaced apart from the road surface structure; and A mechanical boundary loading component is arranged between the reaction wall and the road surface structure, one end of the mechanical boundary loading component is fixed to the reaction wall, and the other end of the mechanical boundary loading component can abut against the outer periphery of the road surface structure to apply a lateral load to the road surface structure.

2. The static and dynamic test device for quantitative research of underground road damage as claimed in claim 1, characterized in that: The underground diseased body includes cavities, voids and loose bodies. The cavities and voids are simulated by removing the spring elements at corresponding positions, and the loose bodies are simulated by replacing the original spring elements with the spring elements having lower elastic stiffness.

3. The static and dynamic test device for quantitative research of underground road damage as claimed in claim 1, characterized in that: The load applied by the hydraulic servo loading system is adjustable. The hydraulic servo loading system can slowly increase the load value according to the loading rate until the road surface structure is destroyed, and record its load time curve, destruction load value, deformation value and destruction characteristic image; the hydraulic servo loading system can also apply a cyclic load in the form of a preset function until the road surface structure is destroyed, and record its load time curve, number of cycles, deformation value and destruction characteristic image.

4. The static and dynamic test device for quantitative research of underground road damage as claimed in claim 1, characterized in that: The static and dynamic test device also includes a test substrate, and the simulated roadbed spring array is arranged on the test substrate.

5. The static and dynamic test device for quantitative research of underground road damage as claimed in claim 4, characterized in that: The test substrate is provided with a plurality of grooves, each of the spring elements corresponds to one of the grooves, and each of the spring elements is partially disposed in the corresponding groove.

6. The static and dynamic test device for quantitative research of underground road damage as claimed in claim 5, characterized in that: The spring element includes a first steel plate, a second steel plate and a spring, one end of the spring is fixedly connected to the first steel plate, the other end of the spring is fixedly connected to the second steel plate, the first steel plate is arranged in the corresponding groove, and the second steel plate is used to support the road surface structure.

7. The static and dynamic test device for quantitative research of underground road damage as claimed in claim 6, characterized in that: The elastic stiffness of the spring can be selected to simulate roadbeds with different stiffness; the elastic stiffness specifications of the spring can be partially removed or partially replaced to simulate different types or geometric contours of underground diseased bodies.

8. The static and dynamic test device for quantitative research of underground road damage as claimed in claim 1, characterized in that: The mechanical boundary loading component includes multiple loading structures, and the multiple loading structures are evenly distributed on the road surface structure. The number of the reaction walls is four, and the four reaction walls are evenly distributed around the road surface structure. Each of the loading structures is arranged between the reaction wall and the road surface structure, and each of the loading structures is used to apply a lateral load to the road surface structure.

9. The static and dynamic test device for quantitative research of underground road damage as claimed in claim 8, characterized in that: The loading structure includes a digital jack and a third steel plate. One end of the digital jack is fixedly disposed on the reaction wall, and the other end of the digital jack is connected to the third steel plate. The digital jack can drive the third steel plate to move along the axial direction of the digital jack so that the third steel plate can resist the side wall of the road surface structure and apply a lateral load to the road surface structure.

10. The static and dynamic test device for quantitative research of underground road damage bodies as claimed in claim 9, characterized in that: The digital jacks of each loading structure apply loads to the four sides of the road surface structure in a symmetrical loading manner, and slowly increase the value of the digital jack to a specified load to ensure that the spatial position of the road surface structure remains unchanged during the loading process.

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