Thermal-force response characteristic testing device of energy-saving electric power storage pile

Abstract

The utility model discloses a thermal-force response characteristic testing device of an energy-saving electric power storage pile. The device comprises a model pile which is loaded with electrolyte; the model pile is arranged in the model box, a soil body is filled between the model pile and the model box, and a water inlet hole and a water outlet hole are formed in the side wall of the model box; the pressure applying assembly is arranged on the model pile and the soil body and used for applying pressure to the model pile and the soil body; the plurality of sensors comprise a soil pressure sensor, a temperature sensor and a pore water pressure sensor which are arranged in a soil body, a plurality of pairs of strain gauges which are arranged on the outer side wall of the model pile, and a first weight sensor which is arranged below the model pile and is adjacent to the bottom surface of the model pile; and the second weight sensor is arranged above the model pile and is adjacent to the top surface of the model pile. According to the utility model, pile side friction resistance, pile end force and thermodynamic change in a soil body in the charging and discharging process of the energy-saving electric power storage pile can be effectively monitored, and the energy-saving electric power storage pile can be better configured, regulated and controlled based on the above.

Description

Technical Field

[0001] The utility model relates to the field of energy integration, and more particularly to a test device for the thermal-mechanical response characteristics of an energy-saving storage pile. Background Art

[0002] The energy-saving storage pile is a new type of energy-saving energy storage technology that uses underground pile foundations for charging and discharging. It is a new type of battery pile foundation formed by storing electrolyte in the inner cavity of large-diameter pipe piles of buildings, which perfectly combines energy-saving energy storage technology with building pile foundations. The energy-saving storage pile foundation can not only bear the load of the upper building, but also use the surplus electric energy to charge the energy-saving storage pile, so as to store the electric energy in this traditional underground permanent structure "pile foundation", and release the stored electric energy during the peak electricity consumption period, so as to achieve the energy-saving purpose of regulating the peak, valley and flat. As a newly developed pile foundation, the energy-saving storage pile can greatly improve the energy efficiency of the civil engineering industry, thereby reducing the carbon emissions of the construction industry. As a newly developed pile foundation, the energy-saving storage pile faces huge challenges while having great development potential.

[0003] Traditional pile foundations generally enter the ground layer at a depth of 30-50 meters. The temperature, stress and water environment of this layer are relatively stable, and the pile foundation bearing capacity is also relatively stable. The long-term operation results of the pile foundation show that the traditional pile foundation has a strong effect of supporting the upper load and controlling the foundation settlement.

[0004] However, there is a possibility of affecting this balance during the operation of the energy-saving storage pile. With the charging and discharging process, the heat absorption and release process of the energy-saving storage pile will inevitably have a certain impact on the pile side friction resistance, pile end force, temperature of the soil layer and soil pressure, and ultimately lead to a change in the characteristic value of the pile foundation bearing capacity.

[0005] Therefore, it is necessary to effectively monitor the pile side friction resistance, pile end force and thermodynamic changes in the soil during the charging and discharging process of the energy-saving storage pile, but there is currently a lack of targeted devices and methods. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a test device for the thermal-mechanical response characteristics of an energy-saving storage pile. The utility model can effectively monitor the pile side friction resistance, pile end force and thermodynamic changes in the soil during the charging and discharging process of the energy-saving storage pile, and based on this, the energy-saving storage pile can be better configured and regulated, and the actual design and construction of the energy-saving storage pile can be guided.

[0007] In the first aspect of the utility model, a test device for the thermal-mechanical response characteristics of an energy-saving storage pile is provided. The device includes:

[0008] A model pile, in which electrolyte is carried;

[0009] A model box, with model piles arranged in the model box, soil filled between the model piles and the model box, and water inlet holes and drainage holes provided on the side walls of the model box;

[0010] A pressing assembly, provided on the model piles and the soil, for applying pressure to the model piles and the soil; and

[0011] Multiple sensors, including earth pressure sensors, temperature sensors, and pore water pressure sensors arranged in the soil, multiple corresponding strain gauges provided on the outer side walls of the model piles, a first load cell provided below the model piles adjacent to the bottom surface of the model piles, and a second load cell provided above the model piles adjacent to the top surface of the model piles.

[0012] In another preferred example, the model pile is a proportional reduction of the energy-saving storage pile actually to be tested, with a reduction ratio of 15 - 20 times. Unreasonable configurations caused by the reduction of the ratio can be appropriately modified, replaced, or changed to enable its own function without affecting or hardly affecting the test results. For example, after the grouting pipe is reduced proportionally, the flow space inside the pipe is very small and is no longer suitable for the slurry (such as cement, etc.) to pass through. Therefore, the grouting pipe can be reduced by an appropriate ratio and its layout can be appropriately adjusted to complete the grouting function without having too much impact on the test.

[0013] In another preferred example, the inner cavity at the bottom of the model pile is filled with cement mortar for sealing the bottom, so as to enhance the contact area between the pile tip and the soil and thus increase the pile tip force.

[0014] In another preferred example, an anticorrosive material that prevents the inner wall of the model pile from being corroded by the electrolyte of the energy-saving storage pile is smeared on the inner cavity wall of at least a part of the model pile.

[0015] In another preferred example, a pair of strain gauges is pasted on the outer side of the model pile wall at intervals of 10 - 30 cm from top to bottom; the earth pressure sensors, the temperature sensors, or the pore water pressure sensors are evenly distributed in the soil.

[0016] In another preferred example, one earth pressure sensor, one temperature sensor, and one pore water pressure sensor are combined into a sensor unit, and the sensor units are evenly distributed in the soil.

[0017] In another preferred example, the strain gauges are sealed and protected with high-strength AB glue to prevent the strain gauges from being damaged by soil particles or groundwater.

[0018] In another preferred example, the electrolyte is contained in an electrolyte container.

[0019] In another preferred embodiment, a phase change material is contained between the electrolyte container and the model pile to ensure that the temperature of the positive and negative electrodes of the battery does not change significantly during the charging and discharging process, thereby preventing voltage instability.

[0020] In another preferred embodiment, the electrolyte container is respectively provided with the positive electrode (or electrolyte output pipeline) and the negative electrode (or electrolyte input pipeline) of the battery.

[0021] In another preferred example, at least one grouting pipe is arranged in the inner cavity of the model pile between the electrolyte container in the model pile and the inner side of the tube wall of the model pile, the upper end of the grouting pipe extends out of the model pile, and the lower end of the grouting pipe passes through the tube wall of the model pile and extends into the pile-soil gap between the model pile and the soil.

[0022] In another preferred embodiment, the thickness of the pile-soil gap is about 5-20 mm.

[0023] In another preferred example, two grouting pipes are radially symmetrically arranged relative to the axis of the model pile in the inner cavity of the model pile between the electrolyte container and the tube wall of the model pile, and the grouting outlets of the two grouting pipes are respectively set at positions 5-15 cm and 30-50 cm away from the bottom end of the pile.

[0024] In another preferred example, a SOC detection device is arranged between the positive electrode and the negative electrode of the model pile, and the SOC detection device is used to sample the potential parameters of positive and negative electrode electrolytes of different concentrations relative to a reference solution, and simultaneously collect the total volume of the positive electrode electrolyte and the total volume of the negative electrode electrolyte.

[0025] In another preferred embodiment, the model pile and the model box are in a split configuration, and the cross section is enclosed by a transparent glass plate; and the changes behind the glass plate are monitored by a DIC non-contact full-field strain measurement system.

[0026] In another preferred example, the DIC non-contact full-field strain measurement system is used to monitor the soil displacement increment caused by temperature changes during the charging and discharging process in real time, and the relationship between the displacement increment and the soil pressure and pore water pressure during the charging and discharging process is analyzed. At the same time, the relationship between the temperature change during the charging and discharging process and the change in soil displacement and its spatial distribution is studied.

[0027] In another preferred example, the multiple sensors include a hydrogen concentration sensor, which is installed in the model pile and is used to monitor the hydrogen concentration during the charging and discharging process of the model pile.

[0028] In another preferred example, the hydrogen concentration sensor is connected to the hydrogen concentration control host through a connecting wire. The hydrogen concentration sensor is connected to the explosion-proof fan through a connecting wire. The explosion-proof fan is connected to the positive (negative) electrode of the model pile or the electrolyte delivery (inlet) pipeline through an exhaust duct and a gas-liquid separation device. The explosion-proof fan is used to prevent the hydrogen concentration from being too high, thereby avoiding explosion caused by excessive concentration.

[0029] In another preferred example, the model box is composed of 5 high-strength steel plates, and the 5 steel plates serve as the four side walls and the bottom surface of the model box respectively.

[0030] In another preferred example, a plurality of drain holes and a plurality of water inlet holes are provided on the side wall of the model box. The arrangement of the plurality of drain holes and the plurality of water inlet holes guides the water to flow in the soil body of the model box, so as to simulate the underground water flow condition.

[0031] In another preferred example, a circle of permeable stones is provided around the model box to evenly distribute the water pressure and simulate the real underground water flow environment.

[0032] In another preferred example, heat exchange pipes are arranged in the side wall of the model box to heat or cool the soil body in the model box.

[0033] In another preferred example, by circulating heat exchange media with different temperatures in the heat exchange pipes, the heating / cooling of the soil body in the model box is realized, so as to achieve the purpose of actively controlling the temperature of the experimental land (especially the initial temperature), and to simulate the performance of the energy-saving storage pile under different soil temperature conditions.

[0034] In another preferred example, the plurality of sensors transmit data through the data acquisition lines connected thereto, and / or transmit data wirelessly (for example, Bluetooth, WiFi, etc.).

[0035] In another preferred example, when the sensor has a data acquisition line connected thereto, the connection between the sensor and the data acquisition line is fixed with cement mortar.

[0036] In another preferred example, the data acquisition lines are gathered together and accommodated in a pipe, and extend out of the model box through the pipe. Through the barrier of the pipe, the influence of the soil environment on the transmission of the data acquisition lines is reduced.

[0037] Configure the thermal-mechanical response characteristic test device of the energy-saving storage pile as described above according to the actual energy-saving storage pile to be tested and its environmental conditions.

[0038] In the second aspect of the present invention, an installation method of a thermal-mechanical response characteristic test device of an energy-saving storage pile is provided. The method includes:

[0039] S1. Configure a model pile according to the energy-saving energy storage pile to be actually tested, and a plurality of corresponding strain gauges are arranged on the outer side wall of the model pile;

[0040] S2. Configure the size of the model box according to the size of the model pile, and water inlet holes and drain holes are arranged on the side wall of the model box;

[0041] S3. Fill the soil in layers in the model box. After tamping the soil layer by layer along the bottom of the model box to the designed height, place the first load cell on the soil at the center position of the model box;

[0042] S4. Place a sleeve with a diameter 10-30 mm larger than the outer diameter of the model pile on the upper part of the first load cell, and continue to fill the soil, wherein the height of the sleeve exceeds the designed experimental elevation;

[0043] S5. During the process of filling the soil layer by layer upwards, bury soil pressure sensors, pore water pressure sensors and temperature sensors at the designed positions in the soil respectively, for real-time monitoring of the soil temperature change, pressure change and pore water pressure change;

[0044] S6. After filling the soil to the designed experimental elevation, pull out the sleeve from the soil, and thus form a cylindrical cavity in the soil;

[0045] S7. Place the whole model pile at the middle position of the cylindrical cavity, and the lower end of the model pile is in close contact with the first load cell;

[0046] S8. Grout the pile-soil gap between the model pile and the cylindrical cavity to fill the pile-soil gap. After the pile-soil gap is filled with the grouting body, cure the grouting body naturally for 20-50 days;

[0047] S9. Place the second load cell above the model pile and adjacent to the top surface of the model pile;

[0048] S10. Install a pressure application component on the top of the second load cell and the soil, apply pressure to the model pile and the soil, and the soil pressure in the soil can be monitored in real time through the soil pressure sensor; and

[0049] S11. Obtain the thermal-mechanical response characteristic test device of the energy-saving energy storage pile as described in any one of the above.

[0050] In another preferred example, the designed height is 20-30 cm.

[0051] In another preferred example, the designed experimental elevation is the filling height about 20 mm away from the pile top.

[0052] In another preferred example, in step S1, when configuring the model pile, a layer of phase change material with a thickness of 10 - 30 cm is first laid in the inner cavity of the model pile, and then the electrolyte container is fixed in the inner cavity of the model pile. At the same time, an electrolyte output pipeline and an electrolyte input pipeline are respectively arranged in the electrolyte container, and the electrolyte container is filled with electrolyte.

[0053] In another preferred example, at least one grouting pipe is arranged in the inner cavity of the model pile between the electrolyte container and the pipe wall of the model pile. The upper end of the grouting pipe extends out of the model pile, and the lower end of the grouting pipe passes through the pipe wall of the model pile and extends into the pile - soil gap. Subsequently, the phase change material is continuously laid in the voids in the inner cavity of the model pile.

[0054] In another preferred example, in step S8, grouting the pile - soil gap between the model pile and the cylindrical cavity includes: turning on the air compressor, providing pressure to the slurry storage tank through a high - pressure air pipe, squeezing the slurry in the slurry storage tank into the slurry delivery pipe, and the grouting liquid flows into the grouting pipe under high pressure and flows out through the slurry outlet at the end of the grouting pipe into the pile - soil gap, thereby realizing the filling of the pile - soil gap.

[0055] In another preferred example, during the grouting process, the grouting method is controlled by a grouting switch. By regularly opening and closing the grouting switch, pulsating grouting and static pressure grouting are simulated, and at the same time, the change in grouting pressure during the whole grouting process is monitored by a pressure gauge.

[0056] In another preferred example, in step S10, installing the pressure - applying assembly on the top of the second load cell and the soil includes: installing a cross - shaped reaction frame on the top of the model pile, arranging a main jack between the cross - shaped reaction frame and the second load cell, and the pressure of the cross - shaped reaction frame is transmitted to the second load cell through the main jack, and then a vertical load is applied to the model pile.

[0057] In another preferred example, the magnitude of the applied load is determined by the working load of the energy - saving energy - storage pile to be actually tested and the similarity ratio.

[0058] In another preferred example, in step S10, installing the pressure - applying assembly on the top of the second load cell and the soil further includes: laying a bearing plate on the top of the soil, arranging a secondary jack between the cross - shaped reaction frame and the bearing plate, and the pressure of the cross - shaped reaction frame is transmitted to the bearing plate through the secondary jack, and then a vertical load is applied to the soil. The vertical load is evenly transmitted into the soil under the action of the bearing plate, thereby realizing the simulation of soil pressure on different soil layers.

[0059] In the third aspect of the present utility model, a test method for the thermal-mechanical response characteristics of an energy-saving electricity storage pile is provided. The method includes:

[0060] P1. Provide the test device for the thermal-mechanical response characteristics of the energy-saving electricity storage pile as described in any one of the above.

[0061] P2. Gradually and slowly apply the load to the design value through the pressure application component and then keep the load unchanged. Record the readings of the strain gauges, the first load cell, and the second load cell, analyze the distribution characteristics of the skin friction of the pile and the end force of the pile, and at the same time record the initial readings of the earth pressure sensor, the pore water pressure sensor, and the temperature sensor.

[0062] P3. Charge the model pile and record in real time the readings of the strain gauges, the first load cell, the second load cell, the earth pressure sensor, the pore water pressure sensor, and the temperature sensor during the charging process. Analyze the variation laws of the distribution characteristics of the skin friction of the pile and the end force of the pile during the charging process and the variation laws of the earth pressure, pore water pressure, and temperature at different positions in the soil mass away from the model pile by comparison.

[0063] P4. After the charging is completed, discharge the model pile and record in real time the readings of the strain gauges, the first load cell, the second load cell, the earth pressure sensor, the pore water pressure sensor, and the temperature sensor during the discharging process. Analyze the variation laws of the distribution characteristics of the skin friction of the pile and the end force of the pile during the discharging process and the variation laws of the earth pressure, pore water pressure, and temperature at different positions in the soil mass away from the model pile by comparison.

[0064] P5. Sort out the above monitoring results and analyze the thermal-mechanical response characteristics of the model pile during the whole process of charging and discharging and its influence on the skin friction of the pile and the end force of the pile; and

[0065] P6. Based on the analysis of the model pile, analogously obtain the thermal-mechanical response characteristics of the actual energy-saving electricity storage pile to be tested and its influence on the skin friction of the pile and the end force of the pile.

[0066] The method further includes: damaging the electrolyte container of the model pile, causing the electrolyte in the electrolyte container to leak, and recording in real time the readings of the strain gauge, the first weight sensor, the second weight sensor, the earth pressure sensor, the pore water pressure sensor, and the temperature sensor during the leakage process. By comparing and analyzing the variation laws of the distribution characteristics of the shaft friction and the tip force of the pile during the charging process, as well as the variation laws of the earth pressure, pore water pressure, and temperature at different positions in the soil mass relative to the model pile; analyzing the influence of the electrolyte leakage on the thermo-mechanical response characteristics of the energy-saving storage pile.

[0067] In another preferred example, the inner pipe wall of the model pile can be configured to be without coating an anticorrosive material and coated with different anticorrosive materials. By comparing the analysis of their respective thermo-mechanical response characteristics, it can be used to optimize or screen the anticorrosive materials.

[0068] In another preferred example, the method further includes: placing the thermo-mechanical response characteristic test device of the energy-saving storage pile on a seismic table, analyzing the temperature, pore water pressure, earth pressure, and deformation law of the soil mass during the charge and discharge process under the action of seismic loads, and studying the corresponding relationship and internal connection between their variation laws and the seismic loads.

[0069] In another preferred example, the method further includes: arranging an SOC detection device in the electrolyte of the model pile. The SOC detection device is used to sample the potential parameters of the positive and negative electrolyte solutions with different concentrations relative to the reference solution, and at the same time collect the total volume of the positive electrolyte and the total volume of the negative electrolyte to online and real-time monitor the concentration of the electrolyte, and analyze the relationship between the concentration of the electrolyte and the thermo-mechanical response of the model pile.

[0070] It should be understood that within the scope of the present invention, the above-mentioned various technical features of the present invention and the various technical features specifically described below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be elaborated one by one here. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0072] Figure 1 It is a schematic structural diagram of a thermo-mechanical response characteristic test device of an energy-saving storage pile in an example of the present invention;

[0073] Figure 2 It is a schematic diagram of the simulated pile in an example of the present utility model;

[0074] Figure 3 It is a schematic diagram of the model box in an example of the present utility model.

[0075] In each attached drawing, the markings are as follows:

[0076] Model pile 1, model pile pipe wall 1-1, inner cavity 1-2, strain gauge 2, grouting pipe 3, grout outlet 4, electrolyte container 5, electrolyte 6, positive electrode (or electrolyte output pipeline) 7, negative electrode (or electrolyte input pipeline) 8, phase change material 9, cement mortar 10, model box 11, steel plate 12, drainage hole 13, water inlet hole 14, permeable stone 15, soil body 16, load cell 17, sleeve 18, earth pressure sensor 19, pore water pressure sensor 20 and temperature sensor 21, cylindrical cavity 22, pile-soil gap 23, air compressor 24, slurry storage tank 25, high-pressure air pipe 26, grouting switch 27, pressure gauge 28, slurry delivery pipe 29, cross reaction frame 30, main jack 31, secondary jack 32, bearing plate 33. Specific embodiments

[0077] Through extensive and in-depth research and a large number of screenings, the inventor of the present invention has developed for the first time a test device for the thermal-mechanical response characteristics of an energy-saving storage pile, its installation method and test method. Compared with the prior art, the present utility model simulates and constructs a simulated pile and a simulated box according to the energy-saving storage pile and its surrounding environment. By controlling and observing the simulated pile and the simulated box, it is possible to monitor in real time the change rules of the distribution characteristics of the shaft friction and tip force of the energy-saving storage pile during the entire charging and discharging process, as well as the change rules of the earth pressure, pore water pressure and temperature at different positions in the soil body relative to the model pile; thereby establishing the connection between the thermal-mechanical response characteristics of the energy-saving storage pile during the entire charging and discharging process and the bearing performance of the energy-saving storage pile, so that the energy-saving storage pile can be better configured and regulated and the actual design and construction of the energy-saving storage pile can be guided. On this basis, the present utility model is completed.

[0078] The main advantages of the present utility model include:

[0079] (1) It fully simulates the entire charging and discharging process of the energy-saving storage pile under different underlying conditions and the corresponding thermal-mechanical response characteristics;

[0080] (2) It can monitor in real time the change rules of the distribution characteristics of the shaft friction and tip force of the energy-saving storage pile during the entire charging and discharging process, as well as the change rules of the earth pressure, pore water pressure and temperature at different positions in the soil body relative to the model pile;

[0081] (3) It can establish the connection between the thermal-mechanical response characteristics of the energy-saving storage pile during the entire charging and discharging process and the bearing performance of the energy-saving storage pile.

[0082] (4) Through the transparent semi - model test, the temperature change law caused by charge and discharge can be directly observed, as well as the pile body deformation and the pile - side soil body deformation caused by the temperature change.

[0083] The following further elaborates on the present utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, the drawings are schematic diagrams, so the devices and equipment of the present utility model are not limited by the dimensions or proportions of the schematic diagrams.

[0084] It should be noted that in the claims and the specification of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one" does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0085] Embodiment

[0086] The test device for the thermal - mechanical response characteristics of the energy - saving storage pile in this embodiment is as Figures 1-3 shown. This device is obtained through the following installation method:

[0087] Configure the model pile 1 according to the actual energy - saving storage pile to be tested. According to the similarity ratio principle and the basic physical and mechanical parameters and three - dimensional geometric dimensions of the in - situ large - diameter drilled - and - cased - pipe pile, determine the material, outer diameter of the model pile 1, and the thickness of the model pile pipe wall 1 - 1. Pour the cement mortar 10 into the inner cavity 1 - 2 at the pile end of the model pile for bottom sealing to enhance the contact area between the pile end and the soil, thereby increasing the pile - end force.

[0088] Stick a strain gauge 2 every 20 cm from top to bottom on the outer side of the model pile pipe wall 1 - 1 to measure the pile body strain, so as to back - calculate the pile body axial force and the side friction resistance. At the same time, in order to prevent the strain gauge 2 from being damaged by soil particles or groundwater, the upper part of the strain gauge 2 should be sealed and protected with high - strength AB glue. In addition, apply an anti - corrosion material that can prevent the electrolyte of the energy - saving storage pile from corroding the inner wall of the model pile on the inner cavity pipe wall of some model piles.

[0089] A layer of phase change material 9 with a thickness of about 20 cm is first laid in the inner cavity 1-2 of the model pile 1, and then an electrolyte container 5 with a larger thickness, greater strength and stronger corrosion resistance is fixed in the inner cavity 1-2 of the model pile 1, and at the same time, a positive electrode (or electrolyte output pipeline) 7 and a negative electrode (or electrolyte input pipeline) 8 of a battery are respectively arranged in the electrolyte container 5, and an electrolyte 6 is poured into the electrolyte container 5;

[0090] Two grouting pipes 3 are symmetrically arranged on the left and right sides of the inner cavity of the model pile between the electrolyte container 5 and the model pile wall 1-1, and grout outlets 4 are set at 10 cm and 40 cm away from the pile end respectively; then, the phase change material 9 is continuously laid in the gap of the inner cavity 1-2 of the model pile 1 to ensure that the temperature of the positive electrode (or electrolyte output pipeline) 7 and the negative electrode (or electrolyte input pipeline) 8 of the battery during the charging and discharging process does not change significantly, thereby causing voltage instability;

[0091] According to the size of the model pile 1, the size of the model box 11 is designed and determined. The model box 11 is composed of 5 high-strength steel plates 12. The steel plates 12 are provided with several drainage holes 13 and several water inlet holes 14. At the same time, a circle of permeable stones 15 is arranged around the model box 11 to simulate the real underground water flow environment with uniform water pressure.

[0092] A heat exchange pipe can be arranged in the side wall of the model box 1. By continuously circulating a heat exchange medium of a certain temperature in the heat exchange pipe, the soil in the model box can be heated / cooled, thereby achieving the purpose of actively controlling the experimental soil temperature (especially the initial temperature), and simulating the performance of the energy-saving battery pile under different soil temperature conditions.

[0093] The model box 1 is filled with soil in layers. The soil 16 can be a single soil body such as silty clay, silty soil, sandy soil, miscellaneous fill soil, or a composite soil body of silty clay, silty soil, sandy soil, miscellaneous fill soil, or an upper seawater layer and a lower soil layer to simulate the pile foundation environment in the sea. After the soil 16 is compacted layer by layer along the bottom of the model box 11 to a designed height (e.g., 20 cm), a weight sensor 17 is placed on the soil at the center of the model box, and then a sleeve 18 with a diameter 20 mm larger than the outer diameter of the model pile 1 is placed on the upper part of the weight sensor 17, and the filling is continued.

[0094] In the process of filling the soil layer by layer, a soil pressure sensor 19, a pore water pressure sensor 20 and a temperature sensor 21 are respectively embedded in the designed positions in the soil body 16, so as to monitor the temperature change, pressure change and pore water pressure change of the soil body in real time during the experiment. After the soil is filled to the designed experimental elevation, the sleeve 18 is pulled out from the soil body 16, thereby forming a cylindrical cavity 22 in the soil body.

[0095] Place the whole model pile 1 in the middle position of the cylindrical cavity 22. The end of the model pile 1 is in close contact with the load cell 17. Subsequently, install the cross reaction frame 30 on the top of the model pile 1. Arrange a bearing plate 33 on each side of the top soil body, and apply a vertical load through the secondary jack 32. The vertical load is evenly transmitted to the soil layer under the action of the bearing plate 33, so as to simulate the soil pressure of different strata. The soil pressure in the soil body 16 can be monitored in real time by the soil pressure sensor 19.

[0096] There is a pile-soil gap 23 with a thickness of about 10 mm between the model pile 1 and the cylindrical cavity 22. In order to fill this gap, turn on the air compressor 24, provide pressure to the slurry storage tank 25 through the high-pressure air pipe 26, squeeze the slurry in the slurry storage tank 25 into the slurry conveying pipe 29. The grouting liquid flows into the grouting pipe 3 under high pressure and flows out of the slurry outlet 4 at the end of the grouting pipe 3 into the pile-soil gap 23, so as to fill the pile-soil gap. During the grouting process, control the grouting method through the grouting switch 27, and simulate pulsating grouting and static pressure grouting by regularly opening and closing the grouting switch 27. At the same time, monitor the change of grouting pressure during the whole grouting process through the pressure gauge 28.

[0097] After the pile-soil gap 23 is filled with the grouting body, cut off the too long grouting pipe 3, cure the grouting body naturally for 30 days. Subsequently, place the load cell 17 and the main jack 31 at the pile top position, and apply a load to the model pile through the main jack 31 and the cross reaction frame 30.

[0098] The test method of the above device is as follows:

[0099] The magnitude of the load applied to the model pile 1 through the main jack 31 and the cross reaction frame 30 is determined by the actual upper working load of the pile foundation and the similarity ratio. Slowly apply the load of the jack 31 to the design value step by step and then keep the load unchanged; at this time, record the readings of the strain gauge 2 and the top and bottom load cells 17, analyze the distribution characteristics of the side friction resistance and the end force of the pile, and at the same time record the initial readings of the soil pressure sensor 19, the pore water pressure sensor 20 and the temperature sensor 21.

[0100] Connect the positive electrode (or electrolyte output pipeline) 7 and the negative electrode (or electrolyte input pipeline) 8 to the power supply to charge the energy-saving storage pile. During the charging process, record the readings of the strain gauge 2, the top and bottom load cells 17, the soil pressure sensor 19, the pore water pressure sensor 20 and the temperature sensor 21 in real time, and compare and analyze the change rules of the distribution characteristics of the side friction resistance and the end force of the pile during the charging process and the change rules of the soil pressure, pore water pressure and temperature at different positions from the model pile in the soil body 16.

[0101] After the energy-saving energy storage pile finishes charging, disconnect the power supply, connect the positive electrode (or electrolyte output pipeline) 7 and the negative electrode (or electrolyte input pipeline) 8 to the power equipment for discharging, and simultaneously monitor the variation laws of the distribution characteristics of the side friction resistance and tip force of the pile during the whole discharging process, as well as the variation laws of the earth pressure, pore water pressure and temperature at different positions in the soil mass 16 at different distances from the model pile.

[0102] Sort out the monitoring results and analyze the thermo-mechanical response characteristics during the whole charging and discharging process of the energy-saving energy storage pile and its influence on the side friction resistance and tip force of the pile.

[0103] Based on the analysis of the model pile, analogously obtain the thermo-mechanical response characteristics of the energy-saving energy storage pile to be actually tested and its influence on the side friction resistance and tip force of the pile.

[0104] In addition, the electrolyte container 5 can be artificially damaged to cause the electrolyte 6 to leak. The leaked electrolyte 6 will corrode the pipe wall of the model pile. Compare and analyze the axial force and thermo-mechanical response characteristics of the pile body with and without anti-corrosion materials smeared on the inner cavity pipe wall of the model pile 1, and optimize or preferably select anti-corrosion materials.

[0105] In addition, in order to clearly observe the deformation characteristics of the soil mass during the charging and discharging process, the Figure 1 energy-saving energy storage model pile, model box, electrolyte container, etc. in it can be cut into two equal halves along the plane parallel to the paper surface for rearrangement. At the same time, replace the steel plate of the model box along this plane of this cut surface with a transparent glass plate, and place a complete set of DIC non-contact full-field strain measurement system facing the glass plate to monitor in real time the increment of soil displacement caused by temperature change during the charging process in step 11 and the discharging process in step 12, analyze the relationship between the displacement increment and the earth pressure and pore water pressure during the charging and discharging process, and at the same time study the relationship between the temperature change and the change amount of soil displacement and its spatial distribution during the charging and discharging process.

[0106] In addition, the indoor measurement device (including the transparent semi-model device) for the thermo-mechanical response characteristics during the whole charging and discharging process of the energy-saving energy storage model pile can be placed on the seismic table to analyze the temperature, pore water pressure, earth pressure and deformation law of the soil mass during the charging and discharging process under the action of seismic load, and study the corresponding relationship and internal connection between their variation laws and the seismic load.

[0107] In addition, in order to further ensure the test accuracy of the utility model patent, high-precision and high-sensitivity earth pressure sensors, pore water pressure sensors and temperature sensors need to be used. In addition, the soil around the sensors needs to be tamped during the embedding process;

[0108] In addition, in order to prevent the shaking of the data acquisition line of the sensor pre-buried in the soil from affecting the acquisition accuracy, it is necessary to fix the end of the data acquisition line close to the sensor. Cement mortar can be used for fixing but is not limited to it. At the same time, a vertical hollow acrylic tube is set on one side of the model box, and the remaining data acquisition lines that should be buried in the soil are concentrated through the hollow acrylic tube and then pass through the bottom plate of the model box to prevent the buried wires in the soil from affecting the sensor data collection.

[0109] In addition, in order to monitor the electrolyte concentration online in real time and analyze the relationship between the electrolyte state and the thermal-mechanical response of the pile, an SOC detection device can be arranged between the positive and negative electrodes (or an SOC detection device can be built into the battery stack). The SOC detection device can sample the potential parameters of the positive and negative electrolytes of different concentrations relative to the reference solution, and at the same time collect the total volume of the positive electrolyte and the total volume of the negative electrolyte.

[0110] In addition, in order to measure the hydrogen concentration during the charging and discharging process of the energy-saving storage model pile and provide further data support for its safe operation, a hydrogen monitoring emission system can be added. Specifically, a hydrogen concentration sensor is installed inside the cover of the model pile, and the hydrogen concentration sensor is connected to the hydrogen concentration control host through a connecting line, and the hydrogen concentration sensor is connected to the explosion-proof fan through a connecting line, and the explosion-proof fan is connected to the positive (negative) electrode or electrolyte delivery (inlet) pipeline of the energy-saving storage pile through an exhaust duct and a gas-liquid separation device.

[0111] All documents mentioned in this utility model are cited as references in this application, just as each document is cited as reference separately. In addition, it should be understood that after reading the above teaching content of the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A test device for the thermal-mechanical response characteristics of an energy-saving electricity storage pile, characterized in that The device comprises: A model pile, wherein the model pile contains an electrolyte; A model box, wherein the model piles are arranged in the model box, soil is filled between the model piles and the model box, and a water inlet hole and a drainage hole are arranged on the side wall of the model box; a pressure-applying assembly, the pressure-applying assembly being arranged on the model pile and the soil body, and being used for applying pressure to the model pile and the soil body; and A plurality of sensors, comprising a soil pressure sensor, a temperature sensor and a pore water pressure sensor arranged in the soil body, a plurality of pairs of strain gauges arranged on the outer side wall of the model pile, a first weight sensor arranged below the model pile and adjacent to the bottom surface of the model pile, and a second weight sensor arranged above the model pile and adjacent to the top surface of the model pile.

2. The device according to claim 1, characterized in that, A pair of strain gauges are pasted on the outer side of the model pile pipe wall from top to bottom every 10-30 cm; the soil pressure sensor, the temperature sensor or the pore water pressure sensor is evenly distributed in the soil.

3. The device according to claim 1, characterized in that, The strain gauge is sealed and protected with high-strength AB glue to prevent the strain gauge from being damaged by soil particles or groundwater.

4. The device according to claim 1, wherein At least one grouting pipe is arranged in the inner cavity of the model pile between the electrolyte container in the model pile and the inner side of the pipe wall of the model pile, the upper end of the grouting pipe extends out of the model pile, and the lower end of the grouting pipe passes through the pipe wall of the model pile and extends into the pile-soil gap between the model pile and the soil.

5. The device according to claim 4, characterized in that, Two grouting pipes are arranged radially symmetrically relative to the axis of the model pile in the inner cavity of the model pile between the electrolyte container and the tube wall of the model pile, and the grouting outlets of the two grouting pipes are respectively set at positions 5-15 cm and 30-50 cm away from the bottom end of the pile.

6. The device according to claim 1, characterized in that, A SOC detection device is arranged between the positive electrode and the negative electrode of the model pile, and the SOC detection device is used to sample the potential parameters of positive and negative electrode electrolytes of different concentrations relative to a reference solution, and simultaneously collect the total volume of the positive electrode electrolyte and the total volume of the negative electrode electrolyte.

7. The device according to claim 1, characterized in that, The model pile and the model box are in a split configuration, and the cross section is enclosed by a transparent glass plate; and the changes behind the glass plate are monitored by a DIC non-contact full-field strain measurement system.

8. The device according to claim 1, characterized in that, The multiple sensors include a hydrogen concentration sensor, which is installed in the model pile and is used to monitor the hydrogen concentration during the charging and discharging process of the model pile.

9. The device according to any one of claims 1-8, characterized in that, A circle of permeable stones is arranged around the model box to evenly distribute water pressure and simulate the real underground water flow environment.

10. The device according to any one of claims 1-8, characterized in that, A heat exchange pipe is arranged in the side wall of the model box for heating or cooling the soil in the model box.

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