Energy pile model device for centrifuge test

Abstract

The utility model relates to an energy pile model device for centrifugal machine test, which comprises a model pile and a pump for pumping cold and heat exchange liquid, the pump is connected with a temperature control system comprising a heating system and a cooling system, the pump is also connected to an inlet and outlet pipeline in the pile body of the model pile, and the pump and the temperature control system are fixed on a centrifugal machine. The centrifugal machine is installed on a centrifugal platform used for supporting and rotating the whole test device, and a model box is further installed on the centrifugal platform and used for containing a model pile and surrounding soil. According to the invention, the thermal-mechanical response of the energy pile under different geological conditions and temperature cycle conditions can be accurately simulated in a centrifuge test, and a reliable test basis is provided for the design and application of the energy pile.

Description

Technical Field

[0001] The invention relates to the research field of energy piles in geotechnical engineering, and in particular to an energy pile model device for centrifuge testing. Background Art

[0002] Energy piles, by combining pile foundations with ground-source heat pump systems, can efficiently utilize underground soil heat. However, in practical projects, shallow soil temperatures fluctuate seasonally, affecting the performance of energy piles. To accurately simulate the performance of energy piles under different temperature cycles, centrifuge testing has become an important research tool. Summary of the Invention

[0003] The purpose of the utility model is to provide an energy pile model device for centrifuge testing, which can more accurately simulate the performance of the energy pile under different geological conditions and temperature cycle conditions.

[0004] To achieve the above objectives, the present invention provides an energy pile model device for centrifuge testing, comprising a model pile and a pump for pumping a heat exchange liquid. The pump is connected to a temperature control system comprising a heating system and a cooling system. The pump is also connected to inlet and outlet pipes inside the model pile body. The pump and the temperature control system are fixed to a centrifuge, which is mounted on a centrifuge platform for supporting and rotating the entire test device. A model box is also mounted on the centrifuge platform, which is used to hold the model pile and surrounding soil.

[0005] The model pile is made of aluminum alloy material, and the end of the model pile is equipped with a 60° end cone.

[0006] The model pile is also provided with a foil strain gauge for measuring the axial load and an N-type thermocouple for monitoring the temperature of the pile-soil interface.

[0007] The foil strain gauges are arranged in plurality along the axial direction and are mounted on the surface of the model pile to measure the axial force applied to the model pile during the centrifuge test.

[0008] The pump is connected to the temperature control system and the inlet and outlet pipes through a connecting pipe, and a heat-insulating sleeve is wrapped on the connecting pipe.

[0009] The beneficial effects of adopting the above embodiment are:

[0010] By optimizing the structural design and material selection of the energy pile model, combined with centrifuge simulation, a closed-loop temperature control system, and precise monitoring using strain gauges and thermocouples, this application can realistically reproduce the thermo-mechanical response of energy piles under diverse geological and temperature conditions. The device is easy to operate, widely applicable, and provides reliable test data, demonstrating high engineering application and promotional value. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0013] Figure 2 It is a schematic diagram of a centrifuge test according to an embodiment of the present application. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0015] It should be noted that the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0016] See also Figure 1 and Figure 2 An energy pile model device for centrifuge testing includes a model pile 1 and a pump 5 for pumping hot and cold exchange liquid. The pump 5 is connected to a temperature control system including a heating system 6 and a cooling system 7. The pump 5 is also connected to the inlet and outlet pipes 8 inside the pile body of the model pile 1. The pump 5 and the temperature control system are fixed on a centrifuge 9, which is installed on a centrifuge platform 11 for supporting and rotating the entire test device. A model box 12 is also installed on the centrifuge platform 11, and the model box 12 is used to hold the model pile 1 and the surrounding soil.

[0017] The model pile 1 is made of aluminum alloy material, and the end of the model pile 1 is provided with a 60° end cone 2.

[0018] The model pile 1 is also provided with a foil strain gauge 3 for measuring the axial load and an N-type thermocouple 4 for monitoring the temperature of the pile-soil interface.

[0019] A plurality of foil strain gauges 3 are provided along the axial direction. The plurality of foil strain gauges 3 are installed on the surface of the model pile to measure the axial force applied to the model pile during the centrifuge test.

[0020] The pump 5 is connected to the temperature control system and the inlet and outlet pipes 8 via a connecting pipe, and a heat-insulating sleeve 10 is wrapped around the connecting pipe.

[0021] The model pile 1 is processed according to the design requirements to ensure that the inner and outer diameter dimensions and the angle of the end cone 2 are accurate.

[0022] Foil strain gauges 3 and N-type thermocouples 4 are installed at designated locations on the model pile to measure the axial force and temperature of the pile.

[0023] Connect the fluid inlet and outlet pipes (8) to the closed-loop heating (6) and cooling (7) system. Fasten the pump (5) and heating (6) and cooling elements (7) to the centrifuge (9) to ensure the system operates properly during the spin cycle. Check all pipe connections for leaks and insulation.

[0024] The model pile 1 is placed in the model box 12 and filled with soil according to the test requirements. The soil can be of different types as needed, such as sand, clay, etc., and the density and moisture content must meet the test design.

[0025] Fix the model box 12 on the centrifugal platform 11 to ensure that the connection is firm and not loose. Check whether the connection between the centrifugal platform 11 and the centrifuge 9 is safe and reliable.

[0026] Wrap all pipes and exposed metal parts with insulation material 10 to reduce heat loss and improve the efficiency of the temperature control system.

[0027] Connect the foil strain gauge 3 and thermocouple 4 to the external data acquisition system to ensure proper signal transmission. Pre-set data acquisition parameters to ensure data continuity and accuracy during the test.

[0028] Run the test, start the centrifuge, and slowly increase the speed of the centrifuge to reach the predetermined centrifugal acceleration to simulate the gravity field in actual engineering.

[0029] According to the experimental design, the target temperature curve is set. The pump 5 starts pumping the heat exchange liquid, and the heating element 6 or cooling element 7 adjusts the temperature of the liquid, which circulates through the interior of the model pile 1.

[0030] Real-time monitoring: During the test, the data acquisition system records the data of the foil strain gauge 3 and the thermocouple 4 in real time to monitor the axial force and temperature changes of the model pile.

[0031] After the predetermined temperature cycle and centrifugal acceleration are completed, the centrifuge speed is gradually reduced and the temperature control system is stopped. After the centrifuge is completely stopped, the model box 12 is removed and necessary inspections and analyses are performed on the model piles and soil.

[0032] In summary, the utility model provides an energy pile model device for centrifuge testing. Through the rational design of the aluminum alloy model pile, foil strain gauge, and N-type thermocouple, it can accurately simulate the thermo-mechanical response of the energy pile under different geological and temperature conditions under the centrifuge's simulated gravity field. The closed-loop temperature control system and the inlet and outlet pipe circulation system in the device effectively realize the dynamic regulation and control of the pile body temperature, ensuring the accuracy and reliability of the test. The device can not only provide performance data of the energy pile under complex working conditions, but also provide an experimental basis for the optimal design of energy pile technology.

[0033] Those skilled in the art may implement the present invention in various variations without departing from the scope and spirit of the present invention. For example, a feature of one embodiment may be applied to another embodiment to obtain yet another embodiment. Any modifications, equivalent substitutions, and improvements made within the technical concept of the present invention shall be within the scope of the present invention.

Claims

1. An energy pile model device for centrifuge testing, characterized in that: The invention comprises a model pile (1) and a pump (5) for pumping a heat exchange liquid, wherein the pump (5) is connected to a temperature control system comprising a heating system (6) and a cooling system (7), and the pump (5) is also connected to an inlet and outlet pipe (8) inside the pile body of the model pile (1). The pump (5) and the temperature control system are fixed on a centrifuge (9), and the centrifuge (9) is installed on a centrifugal platform (11) for supporting and rotating the entire test device. A model box (12) is also installed on the centrifugal platform (11), and the model box (12) is used to contain the model pile (1) and the surrounding soil.

2. The energy pile model device for centrifuge testing according to claim 1, characterized in that: The model pile (1) is made of aluminum alloy material, and the end of the model pile (1) is provided with a 60° end cone (2).

3. The energy pile model device for centrifuge testing according to claim 1, characterized in that: The model pile (1) is also provided with a foil strain gauge (3) for measuring the axial load and an N-type thermocouple (4) for monitoring the temperature of the pile-soil interface.

4. The energy pile model device for centrifuge testing according to claim 3, characterized in that: A plurality of foil strain gauges (3) are arranged along the axial direction, and the plurality of foil strain gauges (3) are mounted on the surface of the model pile and are used to measure the axial force applied to the model pile during a centrifuge test.

5. The energy pile model device for centrifuge testing according to claim 1, characterized in that: The pump (5) is connected to the temperature control system and the inlet and outlet pipes (8) via a connecting pipe, and the connecting pipe is wrapped with a heat-insulating sleeve (10).

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