A kind of stone road cutting pavement structure mechanical property indoor simulation test device

Abstract

The utility model relates to stone quality road cutting paving simulation test device technical field, concretely is a kind of stone quality road cutting paving structural mechanics performance indoor simulation test device, it include: foundation beam and counterforce beam, the top end of the foundation beam is movably connected with several groups of modularized model barrels, counterforce beam is set up in the upper of modularized model barrel by longitudinal beam, the bottom of counterforce beam is fixed with loading jack, strain sensor and BWB buried type earth pressure cell are provided in modularized model barrel;Beneficial effect is: through full-size model and boundary constraint, restore actual wheel trace load diffusion path, significantly improve the coincidence degree of test data and engineering practice;Adopt separable model barrel, support the layered loading simulation of different thicknesses of pavement structural layer, BWB buried type earth pressure cell is placed at the corresponding position of the inside of structural layer needing monitoring, strain sensor is embedded in the inside of structural layer, and "loading-stress-strain" whole process monitoring is realized through redundant wiring design.

Description

Technical Field

[0001] This utility model relates to the technical field of stone roadbed paving simulation test device, specifically an indoor simulation test device for the mechanical properties of stone roadbed paving structure. Background Technology

[0002] With the continuous increase in highway traffic volume and the growing proportion of heavy-duty vehicles, especially in mountainous sections with complex geological conditions, the construction of high-grade highways is becoming increasingly frequent, placing higher demands on the load-bearing capacity of pavement structural layers. Currently, traditional mountain roads generally adopt a "semi-rigid base course + asphalt surface course" structural system. Research on its pavement layers often relies on indoor simulation testing devices to test the mechanical properties of samples using scaled-down models. However, this scaled-down model testing method differs significantly in scale from actual engineering projects, failing to fully consider size effects and resulting in a certain degree of distortion in the test data.

[0003] Size effects not only lead to discrepancies between key mechanical parameters obtained from experiments and actual field conditions, but also make it difficult to accurately reveal the mechanical mismatch between semi-rigid base courses and high-modulus stone cutting sections, thus affecting the accurate prediction of the "strong base, weak layer" phenomenon, reflective cracking, and early surface layer damage risk. Furthermore, traditional testing equipment has limitations in its ability to reproduce the development of internal material failure cracks and load transfer mechanisms, making it difficult to meet the demands of modern highway engineering for high-precision experimental data and real-time monitoring throughout the entire process. Multiple repeated verifications are required, which is inconsistent with green energy conservation and efficient resource utilization. Utility Model Content

[0004] The purpose of this invention is to provide an indoor simulation test device for the mechanical properties of stone road cut paving structures, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an indoor simulation test device for the mechanical properties of stone road cut paving structures, comprising: a foundation beam and a reaction beam, wherein a number of modular model barrels are movably connected to the top of the foundation beam, the reaction beam is erected above the modular model barrels via longitudinal beams, a loading jack is fixed to the bottom of the reaction beam, and strain sensors and BWB embedded earth pressure cells are installed in the modular model barrels.

[0006] Preferably, the outer wall of the modular model barrel is fixed with lifting lugs and limiting steel plates. Two sets of lifting lugs are provided on each modular model barrel, and the two sets of lifting lugs are symmetrically distributed about the modular model barrel. Three sets of limiting steel plates are provided on each modular model barrel, and the three sets of limiting steel plates are respectively located at the three circumference points of the modular model barrel.

[0007] Preferably, the surface of the modular model barrel is provided with several sets of reserved sensor outlet holes, and the sensor transmission lines of the strain sensor and the BWB embedded earth pressure box transmit data to the data acquisition instrument through the reserved sensor outlet holes.

[0008] Preferably, the modular model barrels are arranged vertically, with a replaceable loading plate movably connected to the top group of modular model barrels. A displacement sensor is movably connected to the top of the replaceable loading plate, and the bottom of the loading jack rests against the top of the replaceable loading plate.

[0009] Preferably, the bottom end of the foundation beam is provided with a roller mounting groove, a hydraulic tappet mechanism is fixed on the inner wall of the roller mounting groove, and a lifting plate is fixed on the hydraulic rod of the hydraulic tappet mechanism.

[0010] Preferably, a roller mounting plate is movably mounted on the bottom end of the lifting plate by bolts and nuts, and a roller is rotatably connected to the bottom end of the roller mounting plate.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The indoor simulation test device for the mechanical properties of stone roadbed paving structures proposed in this utility model, through a full-size model and boundary constraints, recreates the actual wheel track load diffusion path, significantly improving the consistency between test data and engineering reality. It employs a detachable model barrel, which can be quickly assembled and disassembled via lifting lugs, supporting layered loading simulation of pavement structural layers of different thicknesses. BWB embedded earth pressure cells are placed inside the structural layers at the corresponding monitoring locations, and strain sensors are embedded within the structural layers. Redundant wiring design enables full-process monitoring of "loading-stress-strain." The modular splicing of the model barrel eliminates geometrical abrupt changes at rectangular sharp corners, achieving continuous stress distribution. Calculated with the same outer contour dimensions, its effective cross-sectional volume is increased by 27% compared to a rectangle, better conforming to the mechanical boundary conditions of actual engineering, ensuring the accuracy of test data and engineering applicability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the present invention.

[0015] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0016] Figure 4 This is a schematic diagram of the cross-sectional structure of the roller mounting groove.

[0017] In the diagram: 1. Foundation beam; 2. Reaction beam; 3. Modular model barrel; 4. Lifting lug; 5. Replaceable loading plate; 6. Displacement sensor; 7. Loading jack; 8. Strain sensor; 9. BWB embedded earth pressure cell; 10. Limiting steel plate; 11. Reserved sensor cable outlet hole; 12. Longitudinal beam; 13. Sensor transmission line; 14. Roller mounting groove; 15. Hydraulic strut mechanism; 16. Lifting plate; 17. Roller mounting plate; 18. Roller. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] Example 1: Please refer to Figures 1 to 4 This utility model provides a technical solution: an indoor simulation test device for the mechanical properties of stone road cut paving structures, comprising: a foundation beam 1 and a reaction beam 2. Several sets of modular model barrels 3 are movably connected to the top of the foundation beam 1. The reaction beam 2 is supported above the modular model barrels 3 via longitudinal beams 12. A loading jack 7 is fixed to the bottom of the reaction beam 2. Strain sensors 8 and BWB embedded earth pressure cells 9 are installed in the modular model barrels 3. Lifting lugs 4 and limiting steel plates 10 are fixed to the outer wall of the modular model barrels 3. Two sets of lifting lugs 4 are provided on each set of modular model barrels 3, and the two sets of lifting lugs 4 are symmetrically distributed about the modular model barrels 3, providing limiting... Three sets of steel plates 10 are set on each modular model barrel 3. The three sets of limiting steel plates 10 are respectively located at the three-thirds point of the circumference of the modular model barrel 3. Several sets of reserved sensor outlet holes 11 are opened on the surface of the modular model barrel 3. The sensor transmission line 13 of the strain sensor 8 and the BWB embedded earth pressure box 9 transmits data to the data acquisition instrument through the reserved sensor outlet holes 11. Several sets of modular model barrels 3 are distributed vertically. The top set of modular model barrels 3 is movably connected to a replaceable loading plate 5. The top of the replaceable loading plate 5 is movably connected to a displacement sensor 6. The bottom end of the loading jack 7 rests against the top end of the replaceable loading plate 5.

[0020] The device adopts a modular design, in which different structural layer materials can be filled into each modular model barrel 3. Different strain sensors 8 and BWB embedded earth pressure cells 9 can be embedded into each modular model barrel 3 as needed. The sensor transmission lines 13 of the strain sensors 8 and BWB embedded earth pressure cells 9 transmit data to the data acquisition instrument through the reserved sensor outlet holes 11. Each group of modular model barrels 3 is positioned and stacked by limiting steel plates 10. Lifting lugs 4 are fixed to the side walls of the modular model barrels 3 to facilitate lifting and lowering. The bottom end of the longitudinal beam 12 is fixed to the ground, and the top end of the longitudinal beam 12 is fixed with a reaction beam 2. Several sets of modular model barrels 3 are stacked on the top of the foundation beam 1 and the foundation beam 1 is set directly below the loading jack 7. A replaceable loading plate 5 is installed on the upper surface of the top structural layer, and a displacement sensor 6 is integrated on it. The loading jack 7 applies pressure to the replaceable loading plate 5, and the replaceable loading plate 5 transmits the pressure to each set of structural layer materials. The mechanical response inside each structural layer can be tested according to the strain sensor 8 and the BWB embedded earth pressure cell 9.

[0021] Example 2: Based on Example 1, in order to facilitate the movement of the foundation beam 1, a roller mounting groove 14 is provided at the bottom end of the foundation beam 1. A hydraulic tappet mechanism 15 is fixed on the inner wall of the roller mounting groove 14. A lifting plate 16 is fixed on the hydraulic rod of the hydraulic tappet mechanism 15. A roller mounting plate 17 is movably installed at the bottom end of the lifting plate 16 by bolts and nuts. A roller 18 is rotatably connected to the bottom end of the roller mounting plate 17.

[0022] When stacking the modular model barrels 3 onto the foundation beam 1, the hydraulic rod of the hydraulic push rod mechanism 15 is extended, pushing the roller mounting plate 17 and roller 18 downwards, causing the roller 18 to extend out of the roller mounting groove 14, thereby lifting the foundation beam 1. Then, the foundation beam 1 can be easily pushed out from under the reaction beam 2, making it easier to stack the modular model barrels 3 on top of the foundation beam 1. After stacking, the foundation beam 1 is pushed back under the reaction beam 2, and then the hydraulic rod of the hydraulic push rod mechanism 15 is shortened, causing the roller 18 to retract back into the roller mounting groove 14, so that the bottom end of the foundation beam 1 falls to the ground. This prevents the roller 18 from being damaged when the loading jack 7 applies pressure to the structural layer material in the modular model barrel 3, and also prevents the foundation beam 1 from shifting during the test.

[0023] In actual use, different structural layer materials can be filled into each modular model barrel 3, and different strain sensors 8 and BWB embedded earth pressure cells 9 can be filled into each modular model barrel 3 as needed. The sensor transmission lines 13 of the strain sensors 8 and BWB embedded earth pressure cells 9 transmit data to the data acquisition instrument through the reserved sensor outlet holes 11. Each group of modular model barrels 3 is positioned and stacked by limiting steel plates 10. Lifting lugs 4 are fixed on the side wall of the modular model barrel 3 to facilitate the lifting and lowering of the modular model barrel 3. The bottom end of the longitudinal beam 12 is fixed to the ground, and the top end of the longitudinal beam 12 is fixed with a reaction beam 2. After stacking several groups of modular model barrels 3 on the top of the foundation beam 1 and setting the foundation beam 1 directly below the loading jack 7, a replaceable loading plate 5 is installed on the upper surface of the top structural layer. A displacement sensor 6 is integrated on it. Pressure is applied to the replaceable loading plate 5 by the loading jack 7. The carrier plate 5 transmits pressure to each group of structural layer materials. The mechanical response inside each structural layer can be tested using the strain sensor 8 and the BWB embedded earth pressure cell 9. When stacking each group of modular model barrels 3 onto the foundation beam 1, the hydraulic rod of the hydraulic push rod mechanism 15 is extended, pushing the roller mounting plate 17 and roller 18 downwards. This causes the roller 18 to extend out of the roller mounting groove 14, thus lifting the foundation beam 1. Then, the foundation beam 1 can be easily pushed out from under the reaction beam 2, making it easier to stack the modular model barrels 3 on top of the foundation beam 1. After stacking, the foundation beam 1 is pushed back under the reaction beam 2, and then the hydraulic rod of the hydraulic push rod mechanism 15 is shortened, causing the roller 18 to retract back into the roller mounting groove 14, allowing the bottom of the foundation beam 1 to fall to the ground. This prevents the roller 18 from being damaged when the loading jack 7 applies pressure to the structural layer materials in the modular model barrel 3, and also prevents the foundation beam 1 from shifting during the test.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An indoor simulation test device for the mechanical properties of stone cut pavement structures, comprising: The foundation beam (1) and the reaction beam (2) are characterized in that: the top of the foundation beam (1) is movably connected to several sets of modular model barrels (3), the reaction beam (2) is erected above the modular model barrels (3) through the longitudinal beam (12), the bottom of the reaction beam (2) is fixed with a loading jack (7), and the modular model barrel (3) is equipped with a strain sensor (8) and a BWB embedded earth pressure box (9).

2. The indoor simulation test device for the mechanical properties of stone roadbed paving structures according to claim 1, characterized in that: The outer wall of the modular model barrel (3) is fixed with lifting lugs (4) and limiting steel plates (10). There are two sets of lifting lugs (4) on each modular model barrel (3), and the two sets of lifting lugs (4) are symmetrically distributed about the modular model barrel (3). There are three sets of limiting steel plates (10) on each modular model barrel (3), and the three sets of limiting steel plates (10) are respectively located at the three circumference points of the modular model barrel (3).

3. The indoor simulation test device for the mechanical properties of stone cut pavement structures according to claim 1, characterized in that: The modular model barrel (3) has several sets of reserved sensor outlet holes (11) on its surface. The sensor transmission line (13) of the strain sensor (8) and the BWB embedded earth pressure box (9) transmits data to the data acquisition instrument through the reserved sensor outlet holes (11).

4. The indoor simulation test device for the mechanical properties of stone road cut paving structures according to claim 1, characterized in that: Several sets of modular model barrels (3) are arranged vertically. The top set of modular model barrels (3) is movably connected to a replaceable loading plate (5). The top of the replaceable loading plate (5) is movably connected to a displacement sensor (6). The bottom of the loading jack (7) rests against the top of the replaceable loading plate (5).

5. The indoor simulation test device for the mechanical properties of stone road cut paving structures according to claim 1, characterized in that: The bottom end of the foundation beam (1) is provided with a roller mounting groove (14), and a hydraulic tapping mechanism (15) is fixed on the inner wall of the roller mounting groove (14). A lifting plate (16) is fixed on the hydraulic rod of the hydraulic tapping mechanism (15).

6. The indoor simulation test device for the mechanical properties of stone roadbed paving structures according to claim 5, characterized in that: The bottom end of the lifting plate (16) is movably mounted with a roller mounting plate (17) by bolts and nuts, and the bottom end of the roller mounting plate (17) is rotatably connected with a roller (18).

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