Thermal-force response characteristic testing device of energy-saving electric power storage pile, and installation method and testing method of thermal-force response characteristic testing device

Abstract

The invention discloses a heat-force response characteristic testing device of an energy-saving electric power storage pile and an installation method and a testing method thereof. 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. The pile side friction resistance, the pile end force and the thermodynamic change in the soil body in the charging and discharging process of the energy-saving power storage pile can be effectively monitored, and on the basis, the energy-saving power storage pile can be better configured, regulated and controlled.

Description

Technical Field

[0001] The present invention 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, an installation method thereof, and a test method thereof. 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, thereby storing the electric energy in this traditional underground permanent structure "pile foundation". During the peak electricity consumption period, the stored electric energy can be released, so as to achieve the energy-saving purpose of adjusting the peak, valley and flat. As a newly developed pile foundation, the energy-saving storage pile meets the goal of developing green energy-saving buildings in the "dual carbon" policy, can greatly improve the energy efficiency of the civil engineering industry, and thus reduce 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 penetrate into the ground to a depth of 30-50 meters. The temperature, stress, and water environment of this stratum are relatively stable, and the pile foundation bearing capacity is also relatively stable. The long-term operation results of the pile foundation show that traditional pile foundations have 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 progress of charging and discharging, 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 earth pressure, ultimately leading 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 Invention

[0006] The purpose of the present invention is to provide a test device for the thermal-mechanical response characteristics of an energy-saving storage pile, an installation method thereof, and a test method thereof. The present invention 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. 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 a first aspect of the present invention, there is provided a test device for the thermal-mechanical response characteristics of an energy-saving storage pile, the device comprising:

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

[0009] A model box, in which model piles are arranged, and soil is filled between the model piles and the model box. An inlet hole and a drain hole are provided on the side wall of the model box;

[0010] A pressing assembly, which is arranged on the model piles and the soil, and is used to apply pressure to the model piles and the soil; and

[0011] A plurality of sensors, including earth pressure sensors, temperature sensors and pore water pressure sensors arranged in the soil, a plurality of strain gauges arranged on the outer side wall of the model piles, a first load cell arranged under the model piles and adjacent to the bottom surface of the model piles, and a second load cell arranged above the model piles and 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 to be actually tested, and the reduction ratio is 15-20 times. The unreasonable configurations caused by the reduction of the ratio can be appropriately modified, replaced or changed to enable it to achieve its own functions and not affect or hardly affect the test results. For example, after the grouting pipe is reduced in proportion, the flow space inside the pipe is very small and it 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 and will not have 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 wall of the inner cavity of at least a part of the model piles.

[0015] In another preferred example, a pair of strain gauges are 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 example, a phase change material is accommodated between the electrolyte container and the model pile to ensure that the temperature during the charge and discharge processes of the positive and negative electrodes of the battery does not change significantly, thereby causing voltage instability.

[0020] In another preferred example, the electrolyte container is respectively arranged at 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 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 body.

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

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

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

[0025] In another preferred example, the model pile and the model box are configured in a sectional manner, and the 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 in real time the increment of soil displacement caused by temperature changes during the charge and discharge processes, analyze the relationship between the displacement increment and the soil pressure and pore water pressure during the charge and discharge processes, and at the same time study the relationship between the temperature changes and the change amount of soil displacement and its spatial distribution during the charging and discharging processes, etc.

[0027] In another preferred example, the multiple sensors include a hydrogen concentration sensor, and the hydrogen concentration sensor is installed in the model pile to monitor the hydrogen concentration during the charge and discharge processes 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 flow of water in the soil body of the model box 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 at 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 in claim 1 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 layer by layer 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 an outer 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, thereby forming a cylindrical cavity in the soil;

[0045] S7. Place the whole model pile in 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, naturally cure the grouting body 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 for the energy-saving energy storage pile as described in any one of claims 1-10.

[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. Meanwhile, 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 the high - pressure air pipe, squeezing the slurry in the slurry storage tank into the slurry delivery pipe. 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. Meanwhile, the change in grouting pressure throughout the 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 mass 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. 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 mass further includes: laying a bearing plate on the top of the soil mass, arranging a secondary jack between the cross - shaped reaction frame and the bearing plate. 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 mass. The vertical load is evenly transmitted into the soil mass 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 invention, a test method for the thermal-mechanical response characteristics of an energy-saving electric pile charging station is provided. The method includes:

[0060] P1. Provide a test device for the thermal-mechanical response characteristics of an energy-saving electric pile charging station as described in any one of claims 1-10;

[0061] P2. Gradually and slowly apply a 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 weight sensor, and the second weight sensor, analyze the distribution characteristics of the skin friction and the tip 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 weight sensor, the second weight sensor, 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 and the tip 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;

[0063] P4. After the charging is completed, discharge the model pile and record in real time the readings of the strain gauges, the first weight sensor, the second weight sensor, 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 and the tip 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;

[0064] P5. Organize the above monitoring results, analyze the thermal-mechanical response characteristics of the model pile during the entire charging and discharging process and its influence on the skin friction and the tip 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 electric pile charging station to be tested and its influence on the skin friction and the tip force of the pile.

[0066] 19. The method according to claim 18, wherein the method further comprises: damaging the electrolyte container of the model pile, so that the electrolyte in the electrolyte container leaks, and real-time recording 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, and by comparing and analyzing the change rules of the distribution characteristics of the shaft friction and the tip force of the pile during the charging process and the change rules of the earth pressure, pore water pressure and temperature at different positions in the soil mass away from 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 without applying an anti-corrosion material and coated with different anti-corrosion materials. By comparing the analysis of their respective thermo-mechanical response characteristics, it can be used to optimize or screen the anti-corrosion materials.

[0068] In another preferred example, the method further comprises: 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 load, and studying the corresponding relationship and internal connection between their change laws and the seismic load.

[0069] In another preferred example, the method further comprises: arranging an SOC detection device in the electrolyte of the model pile, and 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, so as 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 technical features of the present invention and the 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 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, other drawings can be obtained based on these drawings without creative efforts.

[0072] Figure 1 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 a simulated pile in an example of the present invention;

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

[0075] In each of the attached drawings, 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-shaped reaction frame 30, main jack 31, secondary jack 32, bearing plate 33. Detailed implementation manners

[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, as well as its installation method and test method. Compared with the prior art, the present invention 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. Thus, the relationship 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 is established, so that the energy-saving storage pile can be better configured and regulated, and it can guide the actual design and construction of the energy-saving storage pile. Based on this, the present invention is completed.

[0078] The main advantages of the present invention 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 relationship 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 pile side soil body deformation caused by the temperature change.

[0083] The following further elaborates the present invention in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, the drawings are schematic diagrams, so the devices and equipment of the present invention are not limited by the size or proportion 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 such 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, so 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 also includes 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 drilling-with-casing pile, determine the material, outer diameter of the model pile 1, and the thickness of the model pile 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] Attach a strain gauge 2 every 20 cm from top to bottom on the outer side of the model pile wall 1-1 to measure the strain of the pile body, so as to back-calculate the axial force and side friction resistance of the pile body. 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 wall of the inner cavity of some model piles.

[0089] First, lay a layer of phase change material 9 with a thickness of about 20 cm in the inner cavity 1-2 of the model pile 1. Subsequently, fix the electrolyte container 5 with a larger thickness, greater strength, and stronger corrosion resistance in the inner cavity 1-2 of the model pile 1. At the same time, set the positive electrode (or electrolyte output pipeline) 7 and the negative electrode (or electrolyte input pipeline) 8 of the battery on the electrolyte container 5 respectively, and pour the electrolyte 6 into the electrolyte container 5;

[0090] On both sides of the inner cavity of the model pile between the electrolyte container 5 and the model pile pipe wall 1-1, symmetrically arrange two grouting pipes 3 on each side, and set slurry outlets 4 at positions 10 cm and 40 cm respectively from the pile end; Subsequently, continue to lay the phase change material 9 in the gap of the inner cavity 1-2 of the model pile 1 to ensure that the temperature during the charge and discharge process of the positive electrode (or electrolyte output pipeline) 7 and the negative electrode (or electrolyte input pipeline) 8 of the battery does not change significantly, thus causing voltage instability;

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

[0092] Heat exchange pipes can be arranged in the side wall of the model box 1. By continuously circulating a heat exchange medium with a certain temperature in the heat exchange pipes, heating / cooling of the soil in the model box can be achieved, and the purpose of actively controlling the temperature of the experimental land (especially the initial temperature) can be achieved, and the performance of the energy-saving energy storage pile under different soil temperature conditions can be simulated.

[0093] Backfill the soil layer by layer in the model box 1. The soil 16 can be a single soil such as silty clay, muddy soil, sandy soil, miscellaneous fill, etc., or a composite soil with layers of silty clay, muddy soil, sandy soil, miscellaneous fill, etc. alternating, or seawater on the upper part and soil layer on the lower part to simulate the pile foundation environment in the sea; After tamping the soil 16 layer by layer along the bottom of the model box 11 to the designed height (such as 20 cm), place the load cell 17 on the soil at the center position of the model box, and then place the sleeve 18 with a diameter 20 mm larger than the outer diameter of the model pile 1 on the upper part of the load cell 17, and continue to backfill the soil;

[0094] During the process of backfilling the soil layer by layer, embed the earth pressure sensor 19, pore water pressure sensor 20, and temperature sensor 21 at the designed positions in the soil 16 respectively, so as to monitor the soil temperature change, pressure change, and pore water pressure change in real time during the experiment. After backfilling the soil to the designed experimental elevation, pull out the sleeve 18 from the soil 16, and then form a cylindrical cavity 22 in the soil;

[0095] Place the entire model pile 1 in the middle 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 of the left and right sides of the top soil, and apply a vertical load through the secondary jack 32. The vertical load is evenly transmitted into 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 mass 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. 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 through the slurry outlet 4 at the end of the grouting pipe 3 into the pile-soil gap 23, so as to achieve the filling of 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 the grouting pressure throughout the 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, and 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 mass 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 shaft friction and tip force on the pile side and 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 thermal-mechanical response characteristics during the entire charging and discharging process of the energy-saving energy storage pile and its influence on the shaft friction and tip force on the pile side.

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

[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 shaft force and thermal-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 a 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 section with a transparent glass plate, and place a complete set of DIC non-contact full-field strain measurement systems facing the glass plate to real-time monitor the soil displacement increment caused by temperature changes during the charging in step 11 and the discharging 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 simultaneously study the relationship between the temperature change and the soil displacement change amount and its spatial distribution during the charging and discharging processes.

[0106] In addition, the indoor measurement device (including the transparent semi-model device) for the thermal-mechanical response characteristics during the entire charging and discharging process of the energy-saving energy storage model pile can be placed on a 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 loads, and study the corresponding relationship and internal connection between their variation laws and seismic loads.

[0107] In addition, in order to further ensure the test accuracy of this invention 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 the present invention are cited as references in this application, just as each document is cited as reference individually. In addition, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A thermal-mechanical response characteristic testing device for energy-saving electric storage piles, 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 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.

3. 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.

4. 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.

5. A method for installing a thermal-mechanical response characteristic test device for an energy-saving electric storage pile, characterized in that: The method comprises: S1. A model pile is configured according to the actual energy-saving power pile to be tested, and multiple pairs of strain gauges are set on the outer wall of the model pile; S2. The size of the model box is configured according to the size of the model pile, and a water inlet and a drainage hole are provided on the side wall of the model box; S3. Fill the model box with soil in layers, compact the soil layer by layer along the bottom of the model box to the designed height, and then place the first weight sensor on the soil at the center of the model box; S4. Place a sleeve having a diameter 10-30 mm larger than the outer diameter of the model pile on the upper portion of the first weight sensor and continue to fill the soil, wherein the height of the sleeve exceeds the designed experimental elevation; S5. In the process of filling up layer by layer, soil pressure sensors, pore water pressure sensors and temperature sensors are embedded in the designed positions in the soil to monitor the changes in soil temperature, pressure and pore water pressure in real time; S6. After the soil is filled to the designed experimental elevation, the sleeve is pulled out from the soil, thereby forming a cylindrical cavity in the soil; S7. The model pile is placed as a whole in the middle of the cylindrical cavity, and the lower end of the model pile is closely fitted with the first weight sensor; S8. Grouting the pile-soil gap between the model pile and the cylindrical cavity to fill the pile-soil gap, and after the pile-soil gap is filled with the grouting body, the grouting body is naturally cured for 20-50 days; S9. The second weight sensor is disposed above the model pile and adjacent to the top surface of the model pile; S10. Installing the pressure component on the top of the second weight sensor and the soil, applying pressure to the model pile and the soil, and the soil pressure in the soil can be monitored in real time by the soil pressure sensor; and S11. Obtain a thermal-mechanical response characteristic testing device for an energy-saving power storage pile as described in any one of claims 1 to 4.

6. The method according to claim 5, characterized in that In step S10, installing the pressure-applying assembly on the top of the second weight sensor and the soil body includes: installing a cross reaction frame on the top of the model pile, and setting a main jack between the cross reaction frame and the second weight sensor. The pressure of the cross reaction frame is transmitted to the second weight sensor through the main jack, and then a vertical load is applied to the model pile.

7. The method according to claim 6, characterized in that In step S10, installing the pressure assembly on the top of the second weight sensor and the soil body also includes: laying a pressure plate on the top of the soil body, setting a secondary jack between the cross reaction frame and the pressure plate, and the pressure of the cross reaction frame is transmitted to the pressure plate through the secondary jack, and then applying a vertical load to the soil body, and the vertical load is evenly transmitted to the soil body under the action of the pressure plate, thereby simulating the soil pressure of different soil layers.

8. A method for testing a device for testing the thermal-mechanical response characteristics of an energy-saving electric storage pile, characterized in that: The method comprises: P1. Provide a thermal-mechanical response characteristics testing device for energy-saving electric piles as described in any one of claims 1-4; P2. Slowly apply the load to the design value step by step through the pressure-applying assembly and keep the load unchanged, record the readings of the strain gauge, the first weight sensor and the second weight sensor, analyze the distribution characteristics of the pile side friction and the pile end force, and record the initial readings of the soil pressure sensor, the pore water pressure sensor and the temperature sensor; P3. charging the model pile, recording in real time the readings of the strain gauge, the first weight sensor, the second weight sensor, the soil pressure sensor, the pore water pressure sensor and the temperature sensor during the charging process, and comparing and analyzing the changing patterns of the distribution characteristics of the pile side friction and the pile end force during the charging process, as well as the changing patterns of the soil pressure, pore water pressure and temperature at different positions in the soil body away from the model pile; P4. After charging, the model pile is discharged, and the readings of the strain gauge, the first weight sensor, the second weight sensor, the soil pressure sensor, the pore water pressure sensor and the temperature sensor are recorded in real time during the discharge process, and the change law of the distribution characteristics of the pile side friction and the pile end force during the discharge process and the change law of the soil pressure, pore water pressure and temperature at different positions in the soil body away from the model pile are compared and analyzed; P5. Arrange the above monitoring results, analyze the thermal-mechanical response characteristics of the model pile during the whole process of charging and discharging and its influence on the pile side friction and the pile end force; and P6. Based on the analysis of the model pile, the thermal-mechanical response characteristics of the energy-saving battery pile that needs to be tested are obtained by analogy, as well as its influence on the pile side friction and pile end force.

9. The method according to claim 8, characterized in that The method also includes: destroying the electrolyte container of the model pile to cause the electrolyte in the electrolyte container to leak, recording in real time the readings of the strain gauge, the first weight sensor, the second weight sensor, the soil pressure sensor, the pore water pressure sensor and the temperature sensor during the leakage process, and comparing and analyzing the changing patterns of the distribution characteristics of the pile side friction and the pile end force during the charging process and the changing patterns of the soil pressure, pore water pressure and temperature at different positions in the soil away from the model pile; analyzing the influence of electrolyte leakage on the thermal-mechanical response characteristics of the energy-saving storage pile.

10. The method according to claim 8, characterized in that The method also includes: placing the thermal-mechanical response characteristic test device of the energy-saving electric storage pile on a seismic platform, analyzing the temperature, pore water pressure, soil pressure and deformation law of the soil during the charging and discharging process under the action of seismic load, and studying the corresponding relationship and internal connection between their changing laws and seismic loads.

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