Testing device and testing method suitable for coastal karst area roadbed disease grouting treatment

Abstract

According to the grouting treatment test device and test method suitable for the coastal karst area roadbed diseases, different seepage paths, different water level heights, different tide frequencies and different erosion ion concentrations can be simulated through the tide simulation system, and large-range and high-precision reduction of the coastal tidal environment is achieved; vehicle loads with different loads are simulated through the vehicle simulation system, and the actual road vehicle speed and loads are better simulated. Roadbed disease grouting experimental research is carried out through a grouting system, the influence of different grouting parameters, disease types and scales on a grout diffusion rule is analyzed, and a theoretical basis is provided for coastal karst area roadbed disease grouting treatment; the test device provided by the invention can realize effective simulation of vehicle load, tidal water level and ion erosion and real-time monitoring of road deformation and damage, and further reveals a road disaster-causing mechanism under the action of load-underground water-ion erosion.

Description

Technical Field

[0001] The invention belongs to the technical field of roadbed disease treatment, and in particular relates to a grouting treatment test device and a test method suitable for roadbed disease treatment in coastal karst areas. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Many coastal cities are located in karst development areas with a high degree of karst development, alternating mixing of salt and fresh water, frequent groundwater fluctuations, karst water scouring and erosion of roadbeds, loosening, hollowing out and settling of roadbed soil, frequent road cracking, settlement and deformation and other disasters, posing a great threat to people's lives and property, and becoming a major problem restricting the development of coastal cities.

[0004] At present, grouting treatment of roadbed diseases has fast construction, small traffic interference, simple operation, low cost, and deep repair can cure the disease, and has been widely used in roadbed disease repair. At present, model devices are mostly focused on the response characteristics and long-term deformation of roads after grouting treatment under traffic loads, and there are few studies on the grouting treatment of roads under the coupling of load-ion erosion-groundwater, resulting in the current grouting treatment of roadbed diseases in coastal karst areas. There is a deviation from the actual situation. And under the coupling effect, the secondary damage of the road structure shortens the service life of the road. Therefore, it is very important to carry out model test research on grouting treatment of roadbed diseases in coastal karst areas. The current test device does not comprehensively consider the influence of comprehensive factors such as tides and vehicles, and cannot well explore different types of roadbed diseases and the effect of grouting for diseases. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a grouting treatment test device and test method suitable for roadbed disease in coastal karst areas, which can realize the effective simulation of vehicle load, tidal water level and ion corrosion and real-time monitoring of road deformation and damage, and then reveal the road disaster mechanism under the action of load-groundwater-ion corrosion, and subsequently realize the long-life evaluation of the road after grouting treatment.

[0006] To achieve the above objectives, the first aspect of the present invention provides a grouting treatment test device suitable for roadbed disease in coastal karst areas, including: a road simulation model, a tidal simulation system, a vehicle simulation system, a grouting system, a road stress and deformation monitoring system, a thermal imaging system and an analysis system.

[0007] The road simulation model comprises a visual model frame; various structural layers of the simulated road are laid in the visual model frame;

[0008] The tidal simulation system is connected to one side of the road simulation model through a seepage hole, and the tidal frequency, water level, and cycle time of the tidal simulation system are set to achieve the simulation of seawater supply with different ion concentrations and groundwater level changes;

[0009] The vehicle simulation system is arranged above the road simulation model, and includes a dynamic load loading system, which realizes the simulation of different vehicle loads and loading times by controlling the pressure and load action time of the dynamic load loading system;

[0010] The grouting system is connected to the road simulation model through a pipeline and is used to perform grouting simulation of different grouting materials and grouting parameters for the road simulation model;

[0011] The road stress and deformation monitoring system is arranged at different positions in the internal space of the road simulation model to monitor the stress, strain and displacement information of each structural layer of the road in real time;

[0012] The thermal imaging system comprises a thermal imaging device arranged outside the road simulation model, and the thermal imaging device is used to record the roadbed disease development process and slurry diffusion process under the coupling effect of dynamic load loading-ion erosion-groundwater;

[0013] The analysis system is connected to the thermal imaging system signal and is used to analyze the effects of different grouting parameters, grouting materials and the development of roadbed diseases on the slurry diffusion.

[0014] The second aspect of the present invention provides a test method for grouting treatment of roadbed diseases in coastal karst areas, using the above-mentioned test device for grouting treatment of roadbed diseases in coastal karst areas, comprising:

[0015] Construct a road simulation model with various road structural layers, and monitor the stress and strain in real time during the paving process of each road structural layer;

[0016] Starting the tidal simulation system, setting different water level heights, tidal times, frequencies, and ion concentrations to simulate the seepage paths of the road simulation model under different seawater supplies and groundwater level changes;

[0018] Starting the vehicle simulation system, setting different loading times, loading frequencies and loading forces of the dynamic load loading system, and simulating different vehicle loads on the road simulation model;

[0019] Starting the grouting system to perform grouting tests with different grouting materials and grouting parameters on the roadbed defects at different positions of the road simulation model;

[0020] Starting a thermal imaging system to record the roadbed disease development process and slurry diffusion process of the road simulation model under the coupling of dynamic load loading, ion erosion and groundwater;

[0021] Based on the recorded data, the effects of different grouting parameters, grouting materials and the degree of roadbed disease development on slurry diffusion are analyzed.

[0022] One or more of the above technical solutions have the following beneficial effects:

[0023] In the present invention, different seepage paths, different water level heights, different tidal frequencies and different erosion ion concentrations can be simulated through the tidal simulation system, so as to realize large-scale and high-precision restoration of the coastal tidal environment; the vehicle simulation system can simulate vehicle loads of different loads, so as to better simulate the actual road vehicle speed and load; the grouting system can be used to carry out grouting test research on roadbed diseases, and analyze the influence of different grouting parameters, disease types and scales on the slurry diffusion law, so as to provide a theoretical basis for grouting treatment of roadbed diseases in coastal karst areas; the test device of the present invention can realize the effective simulation of vehicle loads, tidal water levels and ion erosion, and the real-time monitoring of road deformation and damage, so as to reveal the road disaster mechanism under the action of load-groundwater-ion erosion.

[0024] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 This is a schematic diagram of the structure of the test device in Example 1 of the present invention;

[0027] Among them, 1. model frame; 2. first block acrylic plate; 3. second block acrylic plate; 4. dynamic load loading system; 5. dynamic load control system; 6. air pressure pump; 7. slurry storage barrel; 8. pressure tank; 9. grouting pipe; 10. tidal simulation system; 11. thermal imaging system; 12. control platform; 13. upper layer; 14. middle layer; 15. lower layer; 16. upper base layer; 17. lower base layer; 18. subbase layer; 19. upper roadbed; 20. lower roadbed; 21. upper embankment; 22. lower embankment. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] It should be noted that the terms used herein are for describing specific embodiments only and are not intended to be limiting of exemplary embodiments according to the present invention.

[0030] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0031] Embodiment 1

[0032] This embodiment discloses a grouting treatment test device suitable for roadbed diseases in coastal karst areas, including: a road simulation model, a tide simulation system, a vehicle simulation system, a grouting system, a road stress and deformation monitoring system, a thermal imaging system and an analysis system.

[0033] The road simulation model comprises a visual square model frame, in which various structural layers of the simulated road are laid;

[0034] The tidal simulation system is connected to one side of the road simulation model through a seepage hole, and the tidal frequency, water level, and cycle time of the tidal simulation system are set to achieve the simulation of seawater supply with different ion concentrations and groundwater level changes;

[0035] The vehicle simulation system is arranged above the road simulation model, and includes a dynamic load loading system, which realizes the simulation of different vehicle loads and loading times by controlling the pressure and load action time of the dynamic load loading system;

[0036] The grouting system is connected to the road simulation model through a pipeline and is used to perform grouting simulation of different grouting materials and grouting parameters for the road simulation model;

[0037] The road stress and deformation monitoring system is arranged at different positions in the internal space of the road simulation model to monitor the stress, strain and displacement information of each structural layer of the road in real time;

[0038] The thermal imaging system comprises a thermal imaging device arranged outside the road simulation model, and the thermal imaging device is used to record the roadbed disease development process and slurry diffusion process under the coupling effect of dynamic load loading-ion erosion-groundwater;

[0039] The analysis system is connected to the thermal imaging system signal and is used to analyze the effects of different grouting parameters, grouting materials and the development of roadbed diseases on the slurry diffusion.

[0040] Combination Figure 1 A grouting treatment test device for roadbed diseases in coastal karst areas of this embodiment is described in detail, including:

[0041] The road simulation model includes a model frame 1, the size of the model frame 1 is 5m long × 3.75m wide × 2.8m high, the main structure is made of I-beams, the bottom is made of steel plates, and the surroundings are made of transparent first block acrylic plates 2 and second block acrylic plates 3. The first block acrylic plates 2 and the second block acrylic plates 3 are evenly distributed with seepage holes and are detachable; the detachable parts are sealed with rubber sealing strips to ensure watertightness and realize the visualization of the disease development process.

[0042] The lower embankment 22, the upper embankment 21, the lower roadbed 20, the upper roadbed 19, the subbase 18, the lower base 17, the upper base 16, the lower layer 15, the middle layer 14 and the upper layer 13 are laid in the model frame 1 from bottom to top.

[0043] The road stress deformation monitoring system includes stress sensors, strain sensors and displacement sensors; wherein the stress sensors, strain sensors and displacement sensors are arranged at the bottom of each road layer of the road simulation model, with an interval of 0.5m in the length direction and an interval of 0.25m in the width direction.

[0044] The vehicle simulation system includes a dynamic load loading system 4 and a dynamic load control system 5. The dynamic load loading system 4 includes a hydraulic loading device, a motor, a lift and a load plate, etc. The dynamic load control system 5 can simulate different loading times and loading forces loaded onto the load plate by controlling the hydraulic loading device. Specifically, it can realize the simulation of pressure size 0-50KN and load action time 0.4-2.0s.

[0045] The load plate has the following dimensions: 8.6 cm long × 2.5 cm wide, 17.1 cm long × 3.6 cm wide, and 25.7 cm long × 3.6 cm wide. The load plate is used to simulate different types of vehicles. The dynamic load control system 5 can set the load force and speed according to the traffic load risk level, realize cyclic loading of trapezoidal waves, triangular waves, and half-cycle sine waves, and realize real-time simulation of road vehicle loads.

[0046] The grouting system is equipped with an air pressure pump 6, a slurry storage barrel 7, a pressure tank 8 and a grouting pipe 9; the air pressure pump 6 can provide a pressure range of 0-6MPa, the slurry storage barrel 7 has a capacity of 500L, and the grouting pipe 9 is adjustable from 30mm to 100mm and can be disassembled. The types and scales of roadbed diseases are preset at different locations on the road, and the grouting system is used to achieve fixed-point drilling and grouting, so as to carry out efficient and targeted treatment of roadbed diseases, reduce the waste of slurry and the blindness of treatment.

[0047] The tidal simulation system 10 includes a large-scale water reservoir, in which a tidal circulation pump and a water pump are arranged, etc., which can realize the simulation of seawater supply with different ion concentrations and groundwater level changes; specifically, the tidal circulation pump and the water pump are used to add water to the water reservoir, discharge water, and circulate the water in the water reservoir, so as to realize the simulation of different dynamic water flow rates, water level heights, circulation times, and seawater ion concentrations. The second block-shaped acrylic plate 3 on one side of the tidal simulation system 10 can realize the simulation of different groundwater seepage paths.

[0048] The thermal imaging system 11 is arranged in front of the model frame 1 and can monitor the disease development process and slurry diffusion process in real time.

[0049] The control platform 12 can control the parameters of each module and connect with mobile phones, computers and other devices to realize real-time online data analysis and adjustment.

[0050] The test device of this embodiment can carry out roadbed disease simulation and disease grouting treatment tests of different types and scales. It is an integrated and comprehensive test device from disease development to treatment and finally realizes long-term road stability evaluation.

[0051] In this embodiment, the tidal simulation system 10 can simulate different seepage paths, different water level heights, different tidal frequencies, and different corrosive ion concentrations to achieve large-scale, high-precision restoration of the coastal tidal environment.

[0052] This embodiment can achieve different frequency loading such as trapezoidal cyclic wave, triangle wave and half-period sine cycle by setting up a vehicle simulation system, and simulate vehicle loads of different loads through the control system to better simulate the actual road vehicle speed and load.

[0053] Through the test device of this embodiment, simulation of road settlement, hollowing and other diseases can be achieved, revealing the road instability and damage mechanism under the coupling effect of load-ion erosion-groundwater.

[0054] Through the test device of this embodiment, grouting treatment of different roadbed diseases can be achieved, a fixed-point refined grouting method for roadbed diseases in coastal karst areas is proposed, and a road stability evaluation method under the coupling effect of load-ion erosion-groundwater is formed, providing a theoretical basis for grouting treatment of roadbed diseases in coastal karst areas.

[0055] Embodiment 2

[0056] The purpose of this embodiment is to provide a grouting treatment test method suitable for roadbed diseases in coastal karst areas, including:

[0057] Construct a road simulation model with various road structural layers, and monitor the stress and strain information in real time during the paving process of each road structural layer;

[0058] Starting the tidal simulation system, setting different water level heights, tidal times, frequencies, and ion concentrations to simulate the seepage paths of the road simulation model under different seawater supplies and groundwater level changes;

[0059] Starting the vehicle simulation system, setting different loading times, loading frequencies and loading forces of the dynamic load loading system, and simulating different vehicle loads on the road simulation model;

[0060] Starting the grouting system to perform grouting tests with different grouting materials and grouting parameters on the roadbed defects at different positions of the road simulation model;

[0061] Starting a thermal imaging system to record the roadbed disease development process and slurry diffusion process of the road simulation model under the coupling of dynamic load loading, ion erosion and groundwater;

[0062] Based on the recorded data, the effects of different grouting parameters, grouting materials and the development of roadbed diseases on slurry diffusion are analyzed.

[0063] A method for conducting a test using a grouting treatment test device for roadbed diseases in coastal karst areas in Example 1 includes:

[0064] Step 1: According to the road structure performance, the lower embankment 22, the upper embankment 21, the lower roadbed 20, the upper roadbed 19, the subbase 18, the lower base 17, the upper base 16, the lower layer 15, the middle surface layer 14, and the upper layer 13 are laid in the model frame 1 from bottom to top. The material performance requirements and thickness of each layer are determined according to relevant specifications such as road design and construction design.

[0065] Step 2: During the paving process, stress sensors, strain sensors, displacement sensors and other monitoring elements are buried in each structural layer to monitor the stress, strain and displacement information of each structural layer in real time;

[0066] Step 3: During the filling process of the test device, the static preload size is controlled by changing the dynamic load loading system 4, and the loading time is changed by the dynamic load control system 5 to simulate the looseness of different roadbed soils. The surrounding detachable acrylic plates are excavated to simulate the hollowness of different road structures.

[0067] Step 4: After the laying is completed, set the parameters of the tidal simulation system such as water level, tidal time and frequency, ion concentration, etc., and set the parameters of the dynamic load control system such as loading time, loading frequency and loading force, and replace the load plates of different areas to simulate different vehicle loads;

[0068] Step 5: After the vehicle simulation system is set up, a variety of monitoring methods such as road stress and deformation monitoring system and thermal imaging monitoring system are used to achieve all-round and multi-level monitoring of the roadbed disease development process;

[0069] Step 6: Use a handheld drill to drill holes in roadbed defects at different locations, conduct grouting tests with different grouting pressures, grouting volumes, and grouting materials through the grouting system, monitor the grouting process through a variety of monitoring methods such as the road stress deformation monitoring system and the thermal imaging monitoring system, and perform maintenance after the grouting is completed;

[0070] Step 7: Take samples of the road after grouting reinforcement, analyze the mechanical improvement mechanism of the road structure under the action of grouting, and combine the monitoring system data analysis to obtain the stress-strain response characteristics of the road before and after grouting, and obtain a fixed-point refined grouting method that combines road structure-grouting parameters-grouting materials.

[0071] The road stress and deformation monitoring system and thermal imaging system realize real-time monitoring of the disease occurrence process and grouting process. The radiation wavelength is analyzed in real time by the computer and converted into thermal images to obtain the road instability and damage process under the coupling of load, ion erosion and groundwater. The disaster-causing mechanism of roadbed diseases in coastal karst areas is revealed by analyzing the stress, strain and other data monitored in real time by the stress and deformation monitoring system. At the same time, the diffusion process of slurry in different road structures is visualized and analyzed to obtain the slurry diffusion law.

[0072] Those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computer device, or alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0073] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A grouting treatment test device suitable for roadbed diseases in coastal karst areas, characterized in that: include: Road simulation model, tidal simulation system, vehicle simulation system, grouting system, road stress and deformation monitoring system, thermal imaging system and analysis system. The road simulation model comprises a visual model frame; various structural layers of the simulated road are laid in the visual model frame; The tidal simulation system is connected to one side of the road simulation model through a seepage hole, and the tidal frequency, water level, and cycle time of the tidal simulation system are set to achieve the simulation of seawater supply with different ion concentrations and groundwater level changes; The vehicle simulation system is arranged above the road simulation model, and includes a dynamic load loading system, which realizes the simulation of different vehicle loads and loading times by controlling the pressure and load action time of the dynamic load loading system; The grouting system is connected to the road simulation model through a pipeline and is used to perform grouting simulation of different grouting materials and grouting parameters for the road simulation model; The road stress and deformation monitoring system is arranged at different positions in the internal space of the road simulation model to monitor the stress, strain and displacement information of each structural layer of the road in real time; The thermal imaging system comprises a thermal imaging device arranged outside the road simulation model, and the thermal imaging device is used to record the roadbed disease development process and slurry diffusion process under the coupling effect of dynamic load loading-ion erosion-groundwater; The analysis system is connected to the thermal imaging system signal and is used to analyze the effects of different grouting parameters, grouting materials and the development of roadbed diseases on the slurry diffusion.

2. A grouting treatment test device for roadbed diseases in coastal karst areas as claimed in claim 1, characterized in that: The dynamic load loading system includes a hydraulic loading device and a loading plate. The loading plate is used to simulate different types of vehicles. The dynamic load control system changes the loading time and loading force of the hydraulic loading device on the loading plate to achieve simulation of different vehicle loads.

3. A grouting treatment test device for roadbed diseases in coastal karst areas as claimed in claim 2, characterized in that: The dynamic load control system sets the load force value and speed according to the traffic load risk level, realizes cyclic loading of trapezoidal waves, triangular waves and half-cycle sine waves, and realizes real-time simulation of road vehicle loads.

4. A grouting treatment test device for roadbed diseases in coastal karst areas as claimed in claim 1, characterized in that: The visualized model frame is provided with a lower embankment, an upper embankment, a lower roadbed, an upper roadbed, a subbase layer, a lower base layer, an upper base layer, a lower layer, a middle surface layer and an upper surface layer in sequence from bottom to top.

5. A grouting treatment test device for roadbed diseases in coastal karst areas as claimed in claim 1, characterized in that: The road stress and deformation monitoring system comprises a stress sensor, a strain sensor and a displacement sensor, wherein the stress sensor, the strain sensor and the displacement sensor are respectively arranged in each structural layer of the road.

6. A grouting treatment test device for roadbed diseases in coastal karst areas as claimed in claim 1, characterized in that: During the filling process of the visualized model frame, the simulation of loose diseases of different roadbed soil bodies is achieved by changing the static preloading load size and time.

7. A grouting treatment test device for roadbed diseases in coastal karst areas as claimed in claim 6, characterized in that: The visual model frame is provided with detachable acrylic panels around it, and the roadbed is excavated after the acrylic panels are removed to simulate the hollowing diseases of different road structures.

8. A grouting treatment test device for roadbed diseases in coastal karst areas as claimed in claim 1, characterized in that: The tidal simulation system includes a water reservoir, and a tidal circulation pump and a water pump arranged in the water reservoir; the tidal circulation pump and the water pump are used to add water to and discharge water from the water reservoir and circulate the water in the water reservoir to achieve different dynamic water flow rates, water level heights, circulation times, and seawater ion concentrations.

9. A grouting treatment test method for roadbed diseases in coastal karst areas, characterized in that: include: Construct a road simulation model with various road structural layers, and detect stress and strain information in real time during the paving process of each road structural layer; Starting the tidal simulation system, setting different water level heights, tidal times, frequencies, and ion concentrations to simulate the seepage paths of the road simulation model under different seawater supplies and groundwater level changes; Starting the vehicle simulation system, setting different loading times, loading frequencies and loading forces of the dynamic load loading system, and simulating different vehicle loads on the road simulation model; Starting the grouting system to perform grouting tests with different grouting materials and grouting parameters on the roadbed defects at different positions of the road simulation model; Starting a thermal imaging system to record the roadbed disease development process and slurry diffusion process of the road simulation model under the coupling of dynamic load loading, ion erosion and groundwater; Based on the recorded data, the effects of different grouting parameters, grouting materials and the development of roadbed diseases on slurry diffusion are analyzed.

10. A grouting treatment test method for roadbed diseases in coastal karst areas as claimed in claim 9, characterized in that: The method also includes: using the grouting system to perform grouting on different drilling positions to carry out targeted treatment of roadbed diseases.

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