An accelerated stress perturbation erosion curtain body stability simulation test device and method

Abstract

The application belongs to the field of rock and soil simulation test, and provides a simulation test device and method for accelerating stress disturbance erosion curtain body stability, wherein the device comprises a curtain simulation system, a temperature control system, a tidal hydraulic control system, a stress loading system, a blasting disturbance system and an ion monitoring system. The curtain simulation system mainly comprises a precast curtain body test block, a test box body and a sealing plate. The temperature control system mainly comprises a temperature control rod, which can control the temperature rise and fall. The tidal hydraulic control system mainly comprises a water pressure control module, a water level control module and an erosion ion control module. The stress loading system mainly comprises a hydraulic plate and a stress control module. The blasting disturbance system mainly comprises a vibration plate and a counterforce plate. The ion monitoring system mainly comprises an ion sensor. The application lays a test foundation for the durability research of the curtain in the coastal complex environment.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical simulation testing, and particularly relates to a device and method for simulating the stability of an accelerated stress disturbance erosion curtain. Background Technology

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

[0003] The accelerated construction of underground engineering projects has led to changes in the regional groundwater environment, resulting in severe soil and rock erosion. Grouting is a common method for managing such geological hazards, and grouting curtains are a frequently used approach to maintain groundwater balance and prevent hydrogeological disasters. However, due to the long service life of underground engineering projects and the unique hydrogeological conditions of coastal environments, there is currently little research on the long-term service performance of grouting curtains in coastal environments. This has resulted in the following problems with existing curtain stability simulation devices:

[0004] (1) It cannot simulate tidal hydraulic conditions and cannot fully cover the real simulation of water level, water pressure and ion environment;

[0005] (2) It is impossible to simulate the blasting vibration and existing structural stress for underground engineering disturbances, nor can it control the simulation of blasting vibration frequency, intensity and energy, and cannot realize the accelerated disturbance of stress.

[0006] (3) Existing equipment often uses the method of applying loads to specimens after ion etching curing to achieve the "pseudo-coupling" effect of stress field and chemical field, ignoring the actual situation of underground engineering, that is, the structure is in service under the real coupling of multiple fields such as chemical field, stress field, and humidity field. Summary of the Invention

[0007] To address the technical problems mentioned above, this invention provides an accelerated stress disturbance erosion curtain stability simulation test device and method, which can realize the study of accelerated stress disturbance and ion erosion damage of curtain bodies under complex coastal service environments, and provide guidance for curtain durability research under complex coastal environments.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An accelerated stress disturbance erosion curtain stability simulation test device, comprising:

[0010] Curtain simulation system, temperature control system, tidal hydraulic control system, stress loading system, and blasting disturbance system;

[0011] The curtain simulation system includes a prefabricated curtain body test block and a test chamber; the prefabricated curtain body test block is placed inside the test chamber, and the test chamber is always sealed during the test; the test chamber contains two water cavities that are arranged opposite each other and separated by the prefabricated curtain body test block, which are used to simulate the water environment inside and outside the curtain.

[0012] The temperature control system, tidal hydraulic control system, stress loading system, and explosive disturbance system are all located inside the test chamber.

[0013] The temperature control system is used to control the water temperature in the two water chambers, providing conditions for accelerated ion erosion.

[0014] The tidal hydraulic control system is used to adjust the water pressure, water level and ion concentration in the two water chambers to simulate the different water level differences and ion concentration differences inside and outside the curtain wall in the service environment.

[0015] The stress loading system is used to adjust the magnitude of existing structural stress in the service environment;

[0016] The blasting disturbance system is used to achieve blasting impacts of different intensities, frequencies, and energies.

[0017] As one implementation, the accelerated stress disturbance erosion curtain stability simulation test device further includes: an ion monitoring system for monitoring the curtain ion concentration in the service environment.

[0018] In one implementation, the prefabricated curtain body test block is determined based on the degree of geological fragmentation in the study area and the grouting material used, and it is placed tightly in the groove inside the test chamber.

[0019] In one implementation, the tidal hydraulic control system includes a water pressure control module, a water level control module, and an erosion ion control module;

[0020] The water pressure control module is used for accurate simulation of water pressure at different water depths;

[0021] The water level control module is used to simulate tidal conditions and realize the simulation of the wet and dry cycle conditions of the curtain body.

[0022] The erosion ion control module is used to adjust the concentration and type of erosion ions to simulate the actual seawater ion situation and provide conditions for accelerated ion erosion.

[0023] In one embodiment, the stress loading system includes a hydraulic plate and a stress control module;

[0024] The hydraulic plate is used to apply structural stress to the curtain body, simulating the overlying stress that the curtain body would experience in a real service environment.

[0025] The stress control module is used to apply stress to structures of different sizes, thereby applying cyclic loads from vehicle rolling.

[0026] In one embodiment, the hydraulic plate has the same dimensions as the upper surface of the curtain body.

[0027] In one implementation, the blasting disturbance system includes a vibrating plate and a reaction plate; the vibrating plate is located between the reaction plate and the curtain body, and is in close contact with both, providing the curtain body with blasting impact simulations of different intensities, frequencies, and energies.

[0028] As one implementation method, the surface of the vibrating plate is provided with water-permeable holes.

[0029] As one implementation method, the surface of the reaction plate is provided with water-permeable holes.

[0030] A second aspect of the present invention provides a test method for an accelerated stress disturbance erosion curtain stability simulation test apparatus as described above.

[0031] A test method for an accelerated stress disturbance erosion curtain stability simulation test device as described above includes:

[0032] Place the prefabricated curtain body into the groove of the box body, then place the reaction plate into the groove on the left side of the curtain body, and finally embed the vibrating plate into the gap between the curtain body and the reaction plate.

[0033] Place the hydraulic plate on the upper surface of the curtain body to seal the box;

[0034] Based on the actual situation, the concentration and types of seawater ions are controlled through a tidal hydraulic control system.

[0035] Based on the actual seawater type and concentration, and taking into account the rate of accelerated erosion, the temperature control rod and ion erosion control module are further controlled to adjust the water temperature and ion concentration.

[0036] Based on the stress environment in the actual service of the curtain wall, the vibrating plate in the blasting disturbance system achieves blasting impacts of different intensities, frequencies and energies; in addition, the hydraulic plate and stress control module in the stress loading system adjust the magnitude of the existing structural stress in the service environment.

[0037] By adjusting the water pressure, water level, and ion concentration in the left and right water chambers through the tidal hydraulic control system, the different water level differences and ion concentration differences inside and outside the curtain wall in the service environment can be simulated.

[0038] Finally, the cured curtain body specimens were subjected to mechanical tests to determine the mechanical properties, laying the foundation for research on the durability of curtains in complex coastal environments.

[0039] The beneficial effects of this invention are:

[0040] (1) Existing studies on the durability of curtain structures mostly focus on resistance to ion erosion, accelerating erosion of the curtain structure by controlling temperature and ion concentration, considering the influence of a single chemical field; existing technologies study the mechanical fatigue damage of the curtain structure separately, using vibration impact intensity and frequency. The above are all single factors affecting the curtain structure, while this invention, targeting the actual marine service environment of the curtain structure, realizes the simulation of the durability of the curtain structure under the coupled influence of multiple factors, and integrates each independent influencing factor into a single experimental system, truly achieving the real coupling of multiple factors. This invention considers the application form and assembly method of tides (water level, water pressure, ions), structural stress (magnitude, form), and blasting disturbance (intensity, frequency), including the relationship between the direction of force application and the relative position of the curtain structure. The blasting stress is applied along the thickness direction of the curtain structure, realizing the durability test of the curtain structure under the coupled influence of multiple factors, which is more in line with actual working conditions.

[0041] (2) In the simulation test device of the present invention, all parameters are coordinated with each other. The curtain stability simulation test device is used to realistically replicate the underground engineering structure; the temperature control system is used to regulate the water temperature, and together with the concentration control of ions in the water tank, the two superimposed to achieve the accelerated erosion effect of ions; the tidal hydraulic control system can simulate the real water level rise and fall and water pressure at different depths in the ocean, that is, the dry and wet cycle and hydraulic infiltration environment faced by the curtain body; the stress loading system can simulate the overlying engineering conditions of the curtain body, and simulate the self-weight stress and traffic stress of the overlying structure by applying static load or cyclic load; the blasting disturbance system can simulate the excavation disturbance conditions of underground engineering, and realize the real simulation of blasting distance and charge amount by controlling the strength and frequency of force; the functions realized by the simulation test device of the present invention and the parameters controlled are all real service factors faced by the curtain body in the marine engineering environment. Only by applying multiple parameters in a coupled manner can the curtain body durability be simulated in a way that is close to the real situation.

[0042] (3) This invention can fully simulate the service environment of coastal curtain walls by controlling the water level, water pressure and ion concentration in the test chamber to simulate the water level difference and saline-fresh water environment inside and outside the curtain wall; this invention can simulate the blasting stress disturbance by controlling the blasting impact intensity, frequency and energy to achieve accelerated stress disturbance of the curtain wall; this invention can simulate the existing structural stress in underground curtain wall engineering, and can also simulate cyclic loads under different conditions, which closely matches the actual service stress environment; this invention can realize the rise and fall of water temperature in the test chamber through the temperature control system to simulate the actual seawater temperature; this invention can achieve accelerated ion erosion by controlling the seawater ion concentration and water temperature; the groove in the test chamber of this invention can fix the curtain wall test block and the reaction plate, providing a good stress impact space for the vibration plate.

[0043] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0044] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0045] Figure 1 This is a schematic diagram of the overall experimental device for simulating the stability of an accelerated stress disturbance erosion curtain body according to an embodiment of the present invention;

[0046] Figure 2 Here are detailed views of the vibration plate and reaction plate according to an embodiment of the present invention;

[0047] Figure 3 This is a detailed diagram of the curtain installation according to an embodiment of the present invention.

[0048] The components include: 1. Test chamber, 2. Tidal hydraulic control system, 2-1. Water pressure control module, 2-2. Water level control module, 2-3. Erosion ion control module, 3. Water inlet, 4. Fastening hole, 5. Temperature control rod, 6. Reaction plate, 7. Vibration plate, 8. Prefabricated curtain body, 9. Ion sensor, 10. Sealing plate, 11. Sealing gasket, 12. Hydraulic plate, 13. Stress control module, 14. Left water chamber, 15. Right water chamber, 16. Drainage hole, 17. Water permeable hole, 18. Groove. Detailed Implementation

[0049] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0050] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] like Figure 1 , Figure 2 and Figure 3The accelerated stress disturbance erosion curtain stability simulation test device shown includes a curtain simulation system, which contains a prefabricated curtain body specimen 8, a test chamber 1, a sealing plate 10, and a sealing gasket 11. A temperature control system includes a temperature control rod 5. A tidal hydraulic control system includes a water pressure control module 2-1, a water level control module 2-2, and an erosion ion control module 2-3. A stress loading system includes a hydraulic plate 12 and a stress control module 13. A blasting disturbance system includes a vibration plate 7 and a reaction plate 6. An ion monitoring system includes an ion sensor 9.

[0053] The precast curtain body test block 8 is determined based on the degree of geological fragmentation in the study area and the grouting material used, and it is placed tightly in the groove 18 inside the test chamber 1.

[0054] The test chamber 1 is made of stainless steel, and has water inlet holes 3 and drainage holes 17 on both sides. The water inlet holes 3 are connected to the tidal hydraulic control system 2. The inner side of the test chamber has two grooves 18 of different sizes for placing the prefabricated curtain body test block 8 and the reaction plate 6 to improve its stability. The test chamber includes a left water chamber 14 and a right water chamber 15, separated by the curtain body 8, the vibration plate 7, and the reaction plate 6, to simulate the water environment inside and outside the curtain body 8. The upper surface of the chamber 1 has fastening holes 4, which are the same as the holes on the sealing plate 10 and the sealing gasket 11. The connection of these three parts ensures a good sealing effect for the chamber.

[0055] Temperature control rod 5 is installed in the left water chamber 14 and the right water chamber 15, which can realize the rise and fall of water temperature, achieve precise temperature control, and provide conditions for accelerated ion erosion.

[0056] The water pressure control module 2-1 can accurately simulate water pressure at different water depths.

[0057] The water level control module 2-2 can simulate the rise and fall of tides, and realize the simulation of the dry and wet cycle conditions of the curtain body.

[0058] The erosion ion control module 2-3 can adjust the concentration and type of erosion ions, simulate the actual seawater ion situation, and provide conditions for accelerated ion erosion.

[0059] The water pressure control module 2-1, the water level control module 2-2, and the erosion ion control module 2-3 together constitute the tidal hydraulic control system 2.

[0060] The hydraulic plate 12 has the same dimensions as the upper surface of the curtain body 8 and is placed between the upper surface of the curtain body 8 and the sealing plate 10. Its thickness is the same as that of the sealing gasket 11. It is used to apply structural stress to the curtain body 8 to simulate the overlying stress that the curtain body 8 would experience in a real service environment.

[0061] The stress control module 13 can apply stress to structures of different sizes, and can also apply cyclic loads from vehicle rolling.

[0062] The vibrating plate 7 is located between the reaction plate 6 and the curtain body 8, and is in close contact with both of them, so as to provide the curtain body 8 with blasting impact simulations of different intensities, frequencies and energies. The surface of the vibrating plate 7 is covered with water-permeable holes 17 to facilitate the flow of seawater.

[0063] The reaction plate 6, made of stainless steel, is tightly placed in the groove 18 inside the test chamber to provide restraint for the vibration plate 7. The surface of the reaction plate 6 is covered with water-permeable holes 17 to facilitate the flow of seawater.

[0064] The ion sensor 9 can monitor the concentration of different ions and includes an alarm function for the concentration value.

[0065] The test method using the above-mentioned test apparatus includes the following steps:

[0066] ① Place the prefabricated curtain body into the groove of the box body, then place the reaction plate into the groove on the left side of the curtain body, and finally embed the vibrating plate into the gap between the curtain body and the reaction plate. Seawater comes into contact with the curtain body through the water-permeable holes on the reaction plate and the vibrating plate.

[0067] ② Place the hydraulic plate on the upper surface of the curtain body, then place the sealing gasket and sealing plate in sequence according to the position of the fastening holes of the test chamber, and finally seal the chamber with the fastening screws.

[0068] ③ Subsequently, based on the actual situation, the concentration and type of seawater ions are controlled through a tidal hydraulic control system. Specifically: After the curtain model is sealed, artificial seawater is prepared in the water chamber. The content of Cl-, SO42-, and Mg2+ in the artificial seawater is adjusted according to the actual seawater conditions and erosion ratio requirements, i.e., the amount of NaCl, MgCl2, and MgSO4·7H2O reagents is controlled. After the artificial seawater is prepared, it is poured into the water chamber and sealed. During the experiment, the ion concentration sensor in the water chamber monitors the ion concentration and type in the water in real time. When the ion content falls below the set value, an automatic alarm is triggered via the control panel, at which point the seawater is replaced to maintain the erosion ion concentration.

[0069] ④ Based on the actual seawater type and concentration, and considering the accelerated erosion rate, the temperature control rod and ion erosion control module are further controlled to adjust the water temperature and ion concentration. The temperature control process is as follows: Temperature control is achieved by a temperature control rod in the water chamber, which includes a built-in temperature sensor, a temperature compensator, and a temperature setting system. First, the temperature is set. During the experiment, the temperature sensor monitors the water temperature in real time and feeds it back to the temperature setting system. The temperature setting system, through the temperature compensator, determines whether to continue heating or pause operation for heat preservation based on the real-time temperature, thereby achieving a constant temperature in the water chamber.

[0070] ⑤ Based on the stress environment of the curtain wall under actual service conditions, the vibrating plate in the blasting disturbance system achieves blasting impacts of different intensities, frequencies, and energies. In addition, the hydraulic plate and stress control module in the stress loading system adjust the magnitude of existing structural stress in the service environment.

[0071] ⑥ In addition, the water pressure, water level and ion concentration in the left and right water chambers can be adjusted through the tidal hydraulic control system to simulate the different water level differences and ion concentration differences inside and outside the curtain wall in the service environment.

[0072] ⑦ Finally, the cured curtain body test blocks were subjected to mechanical tests to determine mechanical indicators such as strength and impermeability, laying the foundation for curtain durability research in complex coastal environments.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test apparatus for simulating the stability of an accelerated stress disturbance erosion curtain, characterized in that, include: Curtain simulation system, temperature control system, tidal hydraulic control system, stress loading system, and blasting disturbance system; The curtain simulation system includes a prefabricated curtain body test block and a test chamber; the prefabricated curtain body test block is placed inside the test chamber, and the test chamber is always sealed during the test; the test chamber contains two water cavities that are arranged opposite each other and separated by the prefabricated curtain body test block, which are used to simulate the water environment inside and outside the curtain. The temperature control system, tidal hydraulic control system, stress loading system, and explosive disturbance system are all located inside the test chamber. The tidal hydraulic control system is used to adjust the water pressure, water level and ion concentration in the two water chambers to simulate the different water level differences and ion concentration differences inside and outside the curtain wall in the service environment. The temperature control system is used to control the water temperature in the two water chambers, providing conditions for accelerated ion erosion. The stress loading system is used to adjust the magnitude of existing structural stress in the service environment; The blasting disturbance system is used to achieve blasting impacts of different intensities, frequencies, and energies.

2. The accelerated stress disturbance erosion curtain stability simulation test device as described in claim 1, characterized in that, Also includes: An ion monitoring system is used to monitor the concentration of curtain body ions in the service environment.

3. The accelerated stress disturbance erosion curtain stability simulation test device as described in claim 1, characterized in that, The prefabricated curtain body test block is determined based on the degree of geological fragmentation in the study area and the grouting material used, and it is placed tightly in the groove inside the test chamber.

4. The accelerated stress disturbance erosion curtain stability simulation test device as described in claim 1, characterized in that, The tidal hydraulic control system includes a water pressure control module, a water level control module, and an erosion ion control module; The water pressure control module is used for accurate simulation of water pressure at different water depths; The water level control module is used to simulate the rise and fall of tides and to simulate the dry and wet cycle conditions of the curtain body. The erosion ion control module is used to adjust the concentration and type of erosion ions to simulate the actual seawater ion situation and provide conditions for accelerated ion erosion.

5. The accelerated stress disturbance erosion curtain stability simulation test device as described in claim 1, characterized in that, The stress loading system includes a hydraulic plate and a stress control module; The hydraulic plate is used to apply structural stress to the curtain body, simulating the overlying stress that the curtain body would experience in a real service environment. The stress control module is used to apply stress to structures of different sizes, thereby applying cyclic loads from vehicle rolling.

6. The accelerated stress disturbance erosion curtain stability simulation test device as described in claim 5, characterized in that, The hydraulic plate has the same dimensions as the upper surface of the curtain body.

7. The accelerated stress disturbance erosion curtain stability simulation test device as described in claim 1, characterized in that, The blasting disturbance system includes a vibrating plate and a reaction plate; the vibrating plate is located between the reaction plate and the curtain body, and is in close contact with both, providing the curtain body with blasting impact simulations of different intensities, frequencies and energies.

8. The accelerated stress disturbance erosion curtain stability simulation test device as described in claim 7, characterized in that, The surface of the vibrating plate is covered with water-permeable holes.

9. The accelerated stress disturbance erosion curtain stability simulation test device as described in claim 7, characterized in that, The surface of the reaction plate is covered with water-permeable holes.

10. A test method for an accelerated stress disturbance erosion curtain stability simulation test device as described in any one of claims 1-9, characterized in that, include: Place the prefabricated curtain body into the groove of the box body, then place the reaction plate into the groove on the left side of the curtain body, and finally embed the vibrating plate into the gap between the curtain body and the reaction plate. Place the hydraulic plate on the upper surface of the curtain body to seal the box; Based on the actual situation, the concentration and types of seawater ions are controlled through a tidal hydraulic control system. Based on the actual seawater type and concentration, and taking into account the rate of accelerated erosion, the temperature control rod and ion erosion control module are further controlled to adjust the water temperature and ion concentration. Based on the stress environment in the actual service of the curtain wall, the vibrating plate in the blasting disturbance system achieves blasting impacts of different intensities, frequencies and energies; in addition, the hydraulic plate and stress control module in the stress loading system adjust the magnitude of the existing structural stress in the service environment. By adjusting the water pressure, water level, and ion concentration in the left and right water chambers through the tidal hydraulic control system, the different water level differences and ion concentration differences inside and outside the curtain wall in the service environment can be simulated. Finally, the cured curtain body specimens were subjected to mechanical tests to determine the mechanical properties, laying the foundation for research on the durability of curtains in complex coastal environments.

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