Concrete complex environment experimental device and experimental method

Abstract

The invention relates to the technical field of concrete experiment devices, and discloses a concrete complex environment experiment device and an experiment method.The experiment device comprises a temperature control box, the interior of the temperature control box is divided into two independent cavities which are arranged in a sleeved mode, the middle cavity is a test piece containing area, and the peripheral cavity is a temperature adjusting area; the temperature adjusting area is filled with a heat transfer medium, a water inlet pipe is further arranged in the temperature adjusting area, the bottom of the temperature control box is connected with a heating part to heat the heat transfer medium, the test piece placing area penetrates through the top of the temperature control box, a first bearing plate is arranged at the bottom of the test piece placing area, and a concrete test piece is placed on the first bearing plate; the loading end part applies an axial load to the top of the concrete test piece, a water injection channel is formed in the first bearing plate, and the water inlet pipe is communicated with the water injection channel so as to inject water with a set temperature into the water injection channel or extract water from the water injection channel, so that the combined action of cyclic stress load, cyclic temperature load and water of concrete can be realized at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete experimental devices, and particularly relates to a concrete complex environment experimental device and a concrete stress and deformation testing method. Background Art

[0002] China is in the process of transitioning from fossil fuels to renewable clean energy. It is expected that by 2060, renewable energy power generation (i.e., green electricity) mainly based on wind energy and solar photovoltaic power generation will account for 80% of energy use. However, the technological development of renewable resources such as solar energy, wind energy, biomass energy, and hydropower is greatly restricted by factors such as seasonality, regional dependence, and intermittency. Therefore, their integration with the existing power grid poses challenges in terms of efficiency, stability, and reliability. Compressed air energy storage technology compresses and stores air using intermittent and unstable renewable electric energy, and uses an expander and an electric motor to release the air to generate stable and reliable electric energy during the energy release process. Since underground chambers used as gas storage reservoirs have advantages such as low site selection requirements, short construction periods, and low economic costs, they have great development potential.

[0003] Compressed air energy storage underground chambers usually consist of surrounding rock - concrete lining structure - sealing layer. Among them, the concrete lining structure is a force - transfer structure. Therefore, ensuring that the concrete lining structure does not fail is an important part of maintaining the structural stability of compressed air energy storage underground chambers. However, the unique operating characteristics of compressed air energy storage underground chambers cause the concrete lining structure to bear the combined effects of temperature, stress, and groundwater seepage. In particular, the temperature load and stress load have the characteristics of coordinated cycling, that is, the structure is in a high - temperature and high - pressure state during the gas storage stage, and in a low - temperature and low - pressure state during the gas release stage. The temperature cycling range is from - 20°C to 150°C, and the stress cycling range is from 0 MPa to 10 MPa. After the concrete is affected by temperature, stress, and groundwater, obvious performance changes will occur. To ensure that the concrete can withstand the influence of the operating environment of compressed air energy storage underground chambers during service, accurate testing of the concrete under the corresponding operating environment is required during the engineering design stage.

[0004] At present, research on the influence of cyclic temperature, cyclic stress, and water on the performance of concrete is often carried out independently. However, due to the unique operating characteristics of the underground chamber for compressed air energy storage, the concrete temperature spans the three states of water (-20°C to 150°C), and at the same time, it is necessary to ensure that the performance under cyclic stress is not affected. The research found that freeze-thaw cycle damage below 0°C and reverse hydration reaction above 105°C will both cause a decrease in concrete strength and elastic modulus. At the same time, freeze-thaw cycle damage significantly accelerates the deterioration of the mechanical properties of concrete under uniaxial compression cyclic loading, while high-temperature treatment at 150°C will slightly increase the uniaxial compression strength but will accelerate the deterioration of the mechanical properties of concrete under cyclic loading, thereby reducing the durability of the concrete structure. Ordinary testing equipment cannot be applied to the research of concrete under the action of corresponding temperature, stress, and water.

[0005] Therefore, in order to test the performance of concrete in the underground chamber for compressed air energy storage, it is particularly important to design an easy-to-implement experimental device for concrete in a complex environment and a testing method for the stress and deformation of concrete. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides an experimental device and method for concrete in a complex environment, which can simultaneously realize the combined action of cyclic stress load, cyclic temperature load, and water on concrete.

[0007] In the first aspect of the present invention, an experimental device for concrete in a complex environment is provided, which is applied to the concrete lining structure in the underground chamber for compressed air energy storage, and includes: a temperature control box, the interior of the temperature control box is divided into two nested independent chambers, wherein the middle chamber is the specimen placement area, and the outer chamber is the temperature adjustment area. The temperature adjustment area is filled with a heat transfer medium, and a water inlet pipe is also arranged in the temperature adjustment area. The bottom of the temperature control box is connected with a heating component to heat the heat transfer medium. The specimen placement area penetrates through the top of the temperature control box. The bottom of the specimen placement area has a first bearing plate, and the concrete specimen is placed on the first bearing plate. An axial load is applied to the top of the concrete specimen at the loading end. The first bearing plate has a water injection channel inside, and the water inlet pipe is communicated with the water injection channel to inject water at a set temperature or extract water from it.

[0008] Optionally, the water inlet pipe includes a first water delivery pipe, a second water delivery pipe, and a third water delivery pipe connected in sequence. The first water delivery pipe, the second water delivery pipe, and the third water delivery pipe form a bent pipeline, and the third water delivery pipe is connected with the water injection channel.

[0009] Optionally, the second water delivery pipe protrudes above the top of the temperature control box.

[0010] Optionally, after the concrete specimen is placed on the first bearing plate, a second bearing plate, a first heat insulation layer, and a third bearing plate are sequentially placed on the top of the concrete specimen from bottom to top, and the top of the third bearing plate is connected with the loading end.

[0011] Optionally, the inner diameter of the part where the second bearing plate, the first heat insulation layer and the third bearing plate are located in the test piece placement area is larger than the inner diameter of the part where the concrete test piece is located.

[0012] Optionally, the heating component includes a cast iron plate fixed to the bottom of the temperature control box and an electric heating tube fixed inside the cast iron plate.

[0013] Optionally, semiconductor refrigeration chips are installed on the outer side walls of the temperature control box, and radiators are connected to the outer sides of the semiconductor refrigeration chips.

[0014] In a second aspect of the present invention, an experimental method using the above-mentioned concrete complex environment experimental device is provided, including: Place the concrete test piece in the test piece placement area, and place the temperature control box on the universal testing machine. The loading end of the universal testing machine is connected to apply an axial load to the top of the concrete test piece; Regulate the temperature in the test piece placement area through the heating component and the temperature regulation area, as well as the heating and cooling rate, the number of heating and cooling cycles, and the constant temperature time. Inject or pump water into the test piece placement area through the water inlet pipe to adjust the water level in the test piece placement area, and control the water injection and pumping rate, the water injection and pumping time, the number of water injection and pumping cycles, and the water volume holding time.

[0015] Optionally, when the experimental temperature does not reach the boiling point temperature of water, the water level in the test piece placement area is between the top of the concrete test piece and the first heat insulation layer. When the experimental temperature exceeds the boiling point temperature of water, drain the water in the test piece placement area.

[0016] Optionally, the water in the water inlet pipe is heated to the same temperature as the concrete test piece through the heat transfer medium in the temperature regulation area.

[0017] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art: An experimental device and method for concrete in complex environments provided by an embodiment of the present invention are used to test the axial stress and deformation of concrete in an underground chamber for compressed air energy storage. An axial load is applied to the top of a concrete specimen through a loading end. The temperature control area and heating components can cooperate to uniformly transfer the temperature to the concrete specimen in the specimen placement area by heating a heat transfer medium, thereby regulating the experimental temperature. By fixing a first bearing plate at the bottom of the specimen placement area and arranging a water inlet pipe in the temperature control area, it can ensure that the injected water temperature is consistent with the experimental water temperature. When the experimental temperature does not reach the boiling point temperature of water, water is injected into the specimen placement area through a water injection channel to ensure that the water injection temperature and the temperature of the concrete specimen will not affect the experimental results. When the experimental temperature exceeds the boiling point temperature of water, the water in the specimen placement area can be drained through the water injection channel in the first bearing plate to avoid the water temperature restricting the experimental temperature of the concrete specimen. Thus, the cyclic stress load, cyclic temperature load of the concrete, and the combined action of water can be realized simultaneously, with a temperature range of -20°C to 150°C and a stress range of 0 to 10 MPa. The experimental device for concrete in complex environments provided by an embodiment of the present invention is simple to operate, easy to implement, and has strong adaptability, and can be applied to the concrete deformation test in other similar environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 6 is a schematic structural diagram of an experimental device for concrete in complex environments provided by an embodiment of the present invention; Figure 2 FIG. 7 is a side view of an experimental device for concrete in complex environments provided by an embodiment of the present invention; Figure 3 FIG. Figure 2 is a sectional view taken along line A-A of Figure 4 FIG. Figure 2 is a sectional view taken along line B-B of

[0019] Description of the reference numerals: 1. Temperature control box; 2. Semiconductor refrigeration sheet; 3. Radiator; 4. Cast iron plate; 5. Temperature sensor; 6. Liquid injection hole; 7. Specimen placement area; 8. Heat transfer medium; 9-1. First water injection port; 9-2. Third water injection port; 9-3. Fourth water injection port; 9-4. Second water injection port; 10-1. First water delivery pipe; 10-2. Second water delivery pipe; 10-3. Third water delivery pipe; 11-1. Third bearing plate; 11-2. Second bearing plate; 11-3. First bearing plate; 12-1. First heat insulation layer; 12-2. Second heat insulation layer; 13. Water injection channel; 14. Concrete specimen; 15. Electric heating pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will describe in detail a specific embodiment of the present invention in conjunction with the accompanying drawings. It should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the technical solution of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0022] Therefore, an embodiment of the present invention provides a concrete complex environment experimental device and an experimental method, which can simultaneously realize the combined action of cyclic stress load, cyclic temperature load and water on concrete.

[0023] At least one embodiment of the present invention provides a concrete complex environment experimental device and an experimental method. Among them, a concrete complex environment experimental device includes: a temperature control box, the interior of which is divided into three independent chambers along the horizontal direction. The middle chamber is the specimen placement area, and the two side chambers are the water injection area and the temperature adjustment area respectively. The water injection area is provided with a water inlet pipe, and the interior of the temperature adjustment area is filled with a heat transfer medium to cool the specimen placement area. The bottom of the temperature control box is connected with a heating component to heat the specimen placement area. The specimen placement area penetrates through the top of the temperature control box. The bottom of the specimen placement area has a first bearing plate, and the concrete specimen is placed on the first bearing plate. The loading end applies an axial load to the top of the concrete specimen. The first bearing plate internally has a water injection channel, and the water inlet pipe is communicated with the water injection channel to inject water at a set temperature or extract water therefrom.

[0024] In the above-mentioned concrete complex environment experimental device and experimental method provided by the embodiment of the present invention, an axial load is applied to the top of the concrete specimen through the loading end. The temperature adjustment area and the heating component can cooperate with each other to uniformly transfer the temperature to the concrete specimen in the specimen placement area by heating the heat transfer medium, thereby regulating the experimental temperature. By fixing the first bearing plate at the bottom of the specimen placement area and arranging the water inlet pipe in the temperature adjustment area, it can ensure that the injected water temperature is consistent with the experimental water temperature.

[0025] The following will illustrate the present invention through several specific embodiments. In order to keep the description clear and concise for the following embodiments of the present invention, the detailed description of known functions and known components may be omitted. When any component of the embodiment of the present invention appears in more than one drawing, the component can be represented by the same reference numeral in each drawing.

[0026] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , wherein, Figure 1 is a schematic structural view of a concrete complex environment experimental device provided by an embodiment of the present invention, Figure 2 is a side view of a concrete complex environment experimental device provided by an embodiment of the present invention, Figure 3 is Figure 2 a sectional view taken along the A-A direction of Figure 4 is Figure 2 a sectional view taken along the B-B direction of Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown in the figure, at least some embodiments of the present invention provide a concrete complex environment experimental device for simulating the multiple complex conditions faced by the concrete lining structure in the compressed air energy storage underground chamber in the actual working environment, including: a temperature control box 1, the interior of the temperature control box 1 is divided into two nested independent chambers, where the middle chamber is the specimen placement area 7, which is the core area of the entire device and is used to place the concrete specimens 14 to be tested. The specimen placement area 7 penetrates through the top of the temperature control box 1, facilitating the installation and observation of the concrete specimens 14. The outer chamber is the temperature adjustment area, and the interior of the temperature adjustment area is filled with a heat transfer medium 8, such as coolant or dry ice or antifreeze, etc. There is a liquid injection hole 6 at the top of the temperature control box 1. Before the test, the heat transfer medium 8 needs to be injected through the liquid injection hole 6, and the interior needs to be filled with the heat transfer medium 8 during operation. The heat transfer medium 8 is used to uniformly heat the specimen placement area 7 through heat transfer, thereby regulating the temperature therein. There is also a water inlet pipe provided in the temperature adjustment area. It should be noted that there is a temperature sensor 5 at the top of the temperature control box 1, and the bottom of the temperature control box 1 is connected with a heating component, such as an electric heating wire or a heating plate, to heat the heat transfer medium 8. The heating component heats the heat transfer medium 8 to simulate the influence of high temperature environment or temperature fluctuation on the concrete structure, and then heats the specimen placement area 7. The specimen placement area 7 penetrates through the top of the temperature control box 1. The bottom of the specimen placement area 7 has a first bearing plate 11-3, and the concrete specimen 14 is placed on the first bearing plate 11-3. An axial load is applied to the top of the concrete specimen 14 at the loading end to simulate the mechanical stress borne by the underground chamber during actual operation. The first bearing plate 11-3 has a water injection channel 13 inside, and the water inlet pipe is communicated with the water injection channel 13 to inject water at a set temperature or extract water therefrom. The first bearing plate 11-3 not only plays a role in supporting the specimen, but also is designed with a water injection channel 13 inside for injecting or extracting water at a set temperature around the concrete specimen 14 to simulate the groundwater seepage in the underground chamber. Through this design, the experimental device can simultaneously simulate multiple complex environmental factors such as temperature, water, and stress, so as to comprehensively evaluate the durability and performance of the concrete lining structure in the compressed air energy storage underground chamber. The concrete specimen 14 is placed on the first bearing plate 11-3. During the experiment of controlling the water level in the specimen placement area 7, there will be a situation where it is necessary to completely drain the water in the specimen placement area 7. Setting the water injection channel 13 inside the first bearing plate 11-3 can ensure that the water in the specimen placement area 7 can be completely emptied when needed.

[0027] An experimental device and method for concrete in complex environments provided by an embodiment of the present invention are used to test the axial stress and deformation of concrete in an underground chamber for compressed air energy storage. An axial load is applied to the top of a concrete specimen through a loading end. The temperature control area and heating components can cooperate to uniformly transfer the temperature to the concrete specimen in the specimen placement area by heating a heat transfer medium, thereby regulating the experimental temperature. By fixing a first bearing plate at the bottom of the specimen placement area and arranging a water inlet pipe in the temperature control area, it can ensure that the water temperature injected is consistent with the experimental water temperature. When the experimental temperature does not reach the boiling point temperature of water, water is injected into the specimen placement area through a water injection channel to ensure that the water injection temperature and the temperature of the concrete specimen will not affect the experimental results. When the experimental temperature exceeds the boiling point temperature of water, the water in the specimen placement area can be drained through the water injection channel in the first bearing plate to avoid the water temperature restricting the experimental temperature of the concrete specimen. Thus, the cyclic stress load, cyclic temperature load of the concrete, and the combined action of water can be realized simultaneously. The temperature range is -20°C to 150°C, and the stress range is 0 to 10 MPa. The experimental device for concrete in complex environments provided by an embodiment of the present invention is simple to operate, easy to implement, and has strong adaptability, and can be applied to the concrete deformation test in other similar environments.

[0028] Refer again to Figure 3 , the water inlet pipe includes a first water delivery pipe 10-1, a second water delivery pipe 10-2, and a third water delivery pipe 10-3 connected in sequence. The first water delivery pipe 10-1, the second water delivery pipe 10-2, and the third water delivery pipe 10-3 form a bent pipeline. The top of the water injection area has a first water injection port 9-1. The first water injection port 9-1 is located at an outer position of the temperature control box 1 and is used to connect to an external water source. The first water delivery pipe 10-1 is connected to the first water injection port 9-1. The lower part of the side wall of the specimen placement area 7 has a second water injection port 9-4. The third water delivery pipe 10-3 is connected to the water injection channel 13. The second water injection port 9-4 is connected to the water injection channel 13. By setting the water inlet pipe as a bent pipeline, the length of the water inlet pipe in the temperature control area is increased, which can ensure that the water injection temperature into the specimen placement area 7 is the same as the temperature of the concrete specimen 14 during the test.

[0029] Optionally, the second water delivery pipe 10-2 protrudes from the top of the temperature control box 1. The third water injection port 9-2 and the fourth water injection port 9-3 are adjacent and are located near the specimen placement area 7. The two ends of the second water delivery pipe 10-2 are respectively connected to the third water injection port 9-2 and the fourth water injection port 9-3, so that the second water delivery pipe 10-2 is exposed outside the temperature control box 1. The water injection and water absorption conditions in the specimen placement area 7 can be observed through the water delivery pipe 10-2, and the water injection and water absorption can be dynamically regulated.

[0030] Optionally, after the concrete specimen 14 is placed on the first bearing plate 11-3, a second bearing plate 11-2, a first heat insulation layer 12-1 and a third bearing plate 11-1 are sequentially placed on the top of the concrete specimen 14 from bottom to top, and the top of the third bearing plate 11-1 is connected to the loading end. The second bearing plate 11-2 is an observation and comparison index for the water level in the specimen placement area 7. On the one hand, it controls the water level, and on the other hand, it prevents the first heat insulation layer 12-1 from being wetted by water and affecting its heat insulation effect. Since the second bearing plate 11-2 is made of steel, it will transfer heat to the universal testing machine applying the load. Excessive temperature will cause damage to the universal testing machine. Therefore, a first heat insulation layer 12-1 is provided on it. The first heat insulation layer 12-1 is preferably adiabated with 2 to 5 layers of asbestos fiber. Asbestos fiber is incombustible and has a low thermal conductivity, does not break under high stress, and has good heat insulation effect. And the third bearing plate 11-1 on the first heat insulation layer 12-1 can ensure that the load is evenly transferred to the top of the concrete specimen 14. The second bearing plate 11-2 and the third bearing plate 11-1 can be made of high-strength carbon steel.

[0031] Specifically, the inner diameter of the part where the second bearing plate 11-2, the first heat insulation layer 12-1 and the third bearing plate 11-1 are located in the specimen placement area 7 is larger than the inner diameter of the part where the concrete specimen 14 is located. The larger inner diameter of the part where the second bearing plate 11-2, the first heat insulation layer 12-1 and the third bearing plate 11-1 are located facilitates the observation of the water level change, and the smaller diameter of the part where the concrete specimen 14 is located is conducive to placing the concrete specimen 14.

[0032] Specifically, the heating component includes a cast iron plate 4 fixed to the bottom of the temperature control box 1 and an electric heating tube 15 fixed inside the cast iron plate 4. A second heat insulation layer 12-2 is provided at the bottom of the cast iron plate 1. The second heat insulation layer 12-2 is preferably adiabated with 2 to 5 layers of asbestos fiber.

[0033] Refer again to Figure 1 and Figure 2 , semiconductor refrigeration chips 2 are installed on the outer side walls of the temperature control box 1, and radiators 3 are connected to the outer sides of the semiconductor refrigeration chips 2. When the semiconductor refrigeration chips 2 start to work, the radiators 3 also start to work. The function of the radiators 3 is to ensure the normal operation of the semiconductor refrigeration chips 2, and at the same time improve the refrigeration efficiency of the semiconductor refrigeration chips 2, so that the heat transfer medium 8 can be quickly cooled to the required temperature. The refrigeration power of the semiconductor refrigeration chips 2 is adjusted through an external temperature controller.

[0034] An experimental method using the above concrete complex environment experimental device includes: Placing the concrete specimen 14 in the specimen placement area 7, and placing the temperature control box 1 on the universal testing machine. The loading end of the universal testing machine is connected to apply an axial load to the top of the concrete specimen 14; Regulate the temperature in the specimen placement area 7 through the heating component and the temperature control zone, as well as the heating and cooling rate, the number of heating and cooling cycles, and the constant temperature time. Inject or pump water into the specimen placement area 7 through the water inlet pipe to adjust the water level in the specimen placement area 7, and control the water injection and pumping rate, the water injection and pumping time, the number of water injection and pumping cycles, and the water volume holding time.

[0035] Optionally, when the experimental temperature does not reach the boiling point temperature of water, the water level in the specimen placement area 7 is between the top of the concrete specimen 14 and the first heat insulation layer 12-1. When the experimental temperature exceeds the boiling point temperature of water, the water in the specimen placement area 7 is pumped dry. Generally, the boiling point of water is 100 °C. When the test required temperature is lower than the boiling point temperature of water, water can be used as a heat transfer medium to change the temperature of the concrete specimen 14. When the test required temperature is higher than the boiling point temperature of water, the concrete specimen 14 in the water cannot reach the target temperature. Therefore, the water in the specimen placement area 7 needs to be pumped dry.

[0036] Specifically, the water in the water inlet pipe is heated to the same temperature as the concrete specimen 14 in the temperature control zone through the heat transfer medium 8.

[0037] Optionally, the concrete specimen 14 is a cylindrical specimen with dimensions of 50 mm × 100 mm. The concrete specimen 14 is set as a cylinder to facilitate the realization of the overall temperature change of the concrete.

[0038] The relevant equipment required is as follows: Universal testing machine; used to apply an axial load to the concrete specimen 14 through a third pressure bearing 11-1 and monitor the axial displacement of the concrete specimen 14.

[0039] Water injection and suction device; used to pump or inject water into the first water delivery pipe 10-1, the second water delivery pipe 10-2, the third water delivery pipe 10-3, the water injection channel 13, and the specimen placement area 7 inside the temperature control box 1 through the first water injection port 9-1.

[0040] The experimental method specifically includes the following steps: 1. Prepare the concrete specimen 14 and cure it in a standard curing box to obtain the concrete specimen 14. The concrete specimen 14 is prepared according to the requirements of the JTGE30-2005 specification, and the formed specification is a cylindrical specimen with dimensions of 50 mm × 100 mm; 2. Place the concrete specimen 14 in the specimen placement area 7 of the temperature control box 1, install the third bearing plate 11-1, the second bearing plate 11-2, and the first heat insulation layer 12-1 on the top of the concrete specimen 14, and place the temperature control box 1 on the universal testing machine. The universal testing machine applies an axial load through the third bearing plate 11-1 on the top of the concrete specimen 14; 3. Start the universal testing machine, temperature control box 1 and water injection and suction device and conduct tests to obtain test results. When the test temperature does not reach the boiling point temperature of water, the water level in the specimen placement area 7 should be ensured to be between the top of the concrete specimen 14 and the first heat insulation layer 12-1. When the test temperature exceeds the boiling point temperature of water, the water in the specimen placement area 7 needs to be drained through the water injection and suction device. The stress test load parameters applied to the concrete specimen 14 include the test stress range, loading and unloading rate, loading and unloading cycle times, and load holding time, etc. The temperature test parameters are controlled by the temperature control box 1, including the test temperature range, heating and cooling rate, heating and cooling cycle times, and constant temperature time, etc. The water volume test parameters are set through the water injection and suction device, including the start and end water volumes for testing, the test water volume range, water injection and pumping rate, water injection and pumping time, water injection and pumping cycle times, and water volume holding time.

[0041] The present invention provides a device for testing the stress and deformation of concrete under the combined action of cyclic temperature, cyclic stress and water. The working temperature range of this device is from -20°C to 150°C, and the stress range is from 0 MPa to 10 MPa.

[0042] The above are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A concrete complex environment experimental device, characterized in that: A concrete lining structure used in a compressed air energy storage underground chamber, comprising: a temperature control box (1), the interior of the temperature control box (1) being divided into two independent chambers, wherein the middle chamber is a specimen placement area (7), and the outer chamber is a temperature adjustment area, the temperature adjustment area is filled with a heat transfer medium (8), a water inlet pipe is also provided in the temperature adjustment area, and a heating component is connected to the bottom of the temperature control box (1) to heat the heat transfer medium (8); The specimen placement area (7) passes through the top of the temperature control box (1); the bottom of the specimen placement area (7) has a first pressure plate (11-3); the concrete specimen (14) is placed on the first pressure plate (11-3); the loading end applies an axial load to the top of the concrete specimen (14); the first pressure plate (11-3) has a water injection channel (13) inside; the water inlet pipe is connected to the water injection channel (13) to inject water of a set temperature into the water injection channel or extract water from the water injection channel.

2. The concrete complex environment experimental device according to claim 1, characterized in that: The water inlet pipe comprises a first water pipe (10-1), a second water pipe (10-2) and a third water pipe (10-3) which are connected in sequence, the first water pipe (10-1), the second water pipe (10-2) and the third water pipe (10-3) forming a bent pipeline, and the third water pipe (10-3) is connected to a water injection channel (13).

3. The concrete complex environment experimental device as claimed in claim 2, characterized in that: The second water delivery pipe (10-2) protrudes from the top of the temperature control box (1).

4. The concrete complex environment experimental device according to claim 1, characterized in that: After the concrete specimen (14) is placed on the first pressure-bearing plate (11-3), a second pressure-bearing plate (11-2), a first heat insulation layer (12-1) and a third pressure-bearing plate (11-1) are placed on the top of the concrete specimen (14) in order from bottom to top, and the top of the third pressure-bearing plate (11-1) is connected to the loading end.

5. The concrete complex environment experimental device as claimed in claim 4, characterized in that: The inner diameter of the portion where the second pressure-bearing plate (11-2), the first heat insulation layer (12-1) and the third pressure-bearing plate (11-1) are located in the specimen placement area (7) is greater than the inner diameter of the portion where the concrete specimen (14) is located.

6. The concrete complex environment experimental device according to claim 1, characterized in that: The heating component comprises a cast iron plate (4) fixed to the bottom of the temperature control box (1) and an electric heating tube (15) fixed inside the cast iron plate (4).

7. The concrete complex environment experimental device according to claim 1, characterized in that: The outer side walls of the temperature control box (1) are all installed with semiconductor cooling sheets (2), and the outer sides of the semiconductor cooling sheets (2) are connected with radiators (3).

8. An experimental method using the concrete complex environment experimental device according to any one of claims 1 to 7, characterized in that: include: The concrete specimen (14) is placed in the specimen placement area (7), and the temperature control box (1) is placed on a universal testing machine, and the loading end of the universal testing machine is connected to apply an axial load to the top of the concrete specimen (14); The temperature in the specimen placement area (7) is regulated by means of a heating component and a temperature adjustment area, as well as a heating and cooling rate, a number of heating and cooling cycles, and a constant temperature time. Water is injected or pumped into the specimen placement area (7) through a water inlet pipe to adjust the water level in the specimen placement area (7), and the injection and pumping rate, injection and pumping time, injection and pumping cycle number, and water volume retention time are controlled.

9. The experimental method of the concrete complex environment experimental device according to claim 8, characterized in that: When the test temperature does not reach the boiling point of water, the water level in the specimen placement area (7) is between the top of the concrete specimen (14) and the first thermal insulation layer (12-1); when the test temperature exceeds the boiling point of water, the water in the specimen placement area (7) is drained.

10. The experimental method of the concrete complex environment experimental device according to claim 8, characterized in that: The water in the water inlet pipe is heated by the heat transfer medium (8) in the temperature adjustment zone to the same temperature as the concrete test piece (14).

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