A transparent soil test device and test method for measuring temperature and deformation of energy pile groups

Abstract

The invention discloses a transparent soil test device for measuring temperature and deformation of energy pile groups and a test method thereof. The device comprises an optical platform, a lifting bracket and a transparent model groove. The end bearing groove is fixed in the model groove, the model groove is filled with transparent soil, the model pile is buried in the transparent soil and corresponds to the model groove, and the cap is connected to the pile group. An infrared thermal imager, a CCD industrial camera and a laser transmitter are all slidably connected to the lifting bracket and arranged around the model groove. An infrared thermal imager is also arranged directly above the model groove. The device of the invention is easy to operate and economically feasible. It is a highly innovative energy pile group test device. The test device can simulate four engineering conditions of end bearing pile-pile group low cap, end bearing pile-pile group high cap, friction pile-pile group high cap, and friction pile-pile group low cap, and realize full coverage monitoring of pile-soil temperature field and displacement field, providing a reference for the study of thermodynamic characteristics of energy pile group foundation.

Description

Technical Field

[0001] The invention relates to the field of civil engineering, and in particular to a transparent soil test device for measuring temperature-deformation of an energy pile group and a test method thereof. Background Art

[0002] With the rapid urbanization process in my country, the scale of the construction industry continues to expand, and the proportion of building energy consumption continues to grow. The HVAC system accounts for a large proportion of building energy consumption, so the development of new energy technologies and the reduction of HVAC system energy consumption have become the key to reducing building energy consumption. Geothermal energy, as a clean and renewable energy source, can effectively increase the proportion of non-fossil energy and reduce the energy consumption of traditional air conditioning.

[0003] The development of geothermal energy is mainly based on traditional ground source heat pump technology, which is to bury the condenser or evaporator in the air conditioning system directly underground to exchange heat with the earth, or to complete the heat exchange with the earth through the circulation of intermediate media such as water in a closed loop. However, this engineering technology requires a large underground space. As the available land area in my country decreases, engineering technicians are improving this technology and proposing an energy pile technology solution.

[0004] Energy pile is a new type of pile foundation. The heat exchange tube is directly buried in the concrete pile foundation of the building. Through the heat exchange fluid, the large reverse temperature difference between the soil temperature and winter and summer is used to achieve heat exchange between the soil and the upper building structure to obtain geothermal energy. It can reduce pollution emissions and make full use of energy. However, while the energy pile group foundation exchanges heat with the surrounding soil, it will affect the surrounding piles, including the superposition of temperature field and displacement field, mutual restriction of pile top deformation, load redistribution, etc.

[0005] However, the current energy pile group model test cannot fully monitor the pile-soil temperature field and displacement field, and the pile type is mostly end-bearing-friction piles, which cannot simulate the actual engineering situation. Therefore, it is particularly important to use a new test system to study the thermodynamic characteristics of energy pile groups under temperature cycles and vertical loads. Summary of the invention

[0006] The purpose of the present invention is to provide a transparent soil test device for measuring temperature-deformation of energy pile groups and a test method thereof, so as to solve the problems existing in the prior art.

[0007] The technical solution adopted to achieve the purpose of the present invention is as follows: a transparent soil test device for measuring temperature-deformation of energy pile groups, including an optical platform, a transparent model groove and an end bearing groove.

[0008] The optical platform is provided with a transparent model slot and four lifting brackets, wherein the transparent model slot is a rectangular slot with an opening at the upper end, and the four lifting brackets are respectively located at four sides of the transparent model slot. An infrared thermal imager is installed directly above the transparent model slot.

[0009] An infrared thermal imager, a laser emitter and a CCD industrial camera are slidably connected to each lifting bracket. The infrared thermal imager is located above the laser emitter, and the CCD industrial camera is located below the laser emitter.

[0010] A plurality of end bearing grooves are fixed at the bottom of the transparent model groove. The end bearing grooves include a cover plate, a flexible spring and a pile mold. The pile mold is a vertical cylindrical structure, and the inner wall of the pile mold is coated with waterproof vaseline.

[0011] In working state I, the flexible spring is installed in the pile mold.

[0012] In working state II, the cover plate is sealed on the pile form.

[0013] A model pile is arranged at the upper end of each end bearing groove, and a hole I coaxial with the model pile is arranged on the model pile, and the hole I passes through the upper end surface of the model pile.

[0014] The upper ends of the model piles are connected to the cap, and the connection between the cap and each model pile is provided with a hole II penetrating the upper and lower surfaces thereof, and the hole II is connected with the hole I. The holes I and II are filled with water.

[0015] The transparent model groove is filled with transparent soil, and the support platform is located above the transparent soil.

[0016] Furthermore, the transparent soil comprises a transparent liquid and transparent solid particles with consistent refractive index, and the transparent liquid and the transparent solid particles are alternately filled into the transparent model groove in layers.

[0017] Furthermore, a vertical sliding rod is provided on the lifting bracket, and the infrared thermal imager, the laser transmitter and the CCD industrial camera are slidably connected to the sliding rod.

[0018] Furthermore, the projection of the sliding rod of each lifting bracket on the corresponding side wall of the transparent model groove coincides with the central axis of the side wall.

[0019] Furthermore, the lower surface of the foundation is flush with the upper surface of the transparent soil.

[0020] Furthermore, there is a gap between the lower surface of the foundation and the upper surface of the transparent soil.

[0021] Based on the above-mentioned test method of a transparent soil test device for measuring temperature-deformation of energy pile groups, the test method comprises the following steps:

[0022] 1) placing the transparent model tank on an optical platform, fixing a plurality of pile molds at the bottom of the transparent model tank, coating the inner wall of the pile mold with waterproof vaseline, and installing flexible springs in the pile molds.

[0023] 2) Prepare a transparent liquid having a refractive index consistent with that of the transparent solid particles, first fill the transparent model groove with a predetermined height of the transparent liquid, and then fill the transparent solid particles with the same height, and fill the transparent liquid and the transparent solid particles alternately in sequence.

[0024] 3) When the transparent soil is close to the upper end of the pile mold, several model piles are inserted into the corresponding pile molds, and the transparent soil is continuously filled into the transparent model groove to reach the final design height.

[0025] 4) Fix the cap to the upper ends of several model piles, and fill holes I and II with water.

[0026] 5) Place the four lifting brackets on the optical platform and adjust the positions, and adjust the heights of the infrared thermal imager, CCD industrial camera and laser transmitter. Connect the infrared thermal imager and CCD industrial camera to the computer and debug them.

[0027] 6) Apply vertical load to the foundation. After the settlement is stable, insert a heating rod or a cooling rod into hole I through hole II to apply temperature load to the model pile. During this process, the infrared thermal imager, CCD industrial camera and laser transmitter are always kept on.

[0028] 7) The infrared thermal imager and CCD industrial camera send the collected information to a computer for analysis and processing.

[0029] Based on the above-mentioned test method of a transparent soil test device for measuring temperature-deformation of energy pile groups, the test method comprises the following steps:

[0030] 1) placing the transparent model tank on an optical platform, fixing a plurality of pile molds at the bottom of the transparent model tank, applying waterproof vaseline on the inner wall of the pile molds, and sealing the cover plate on the pile molds.

[0031] 2) Prepare a transparent liquid having a refractive index consistent with that of the transparent solid particles, first fill the transparent model groove with a predetermined height of the transparent liquid, and then fill the transparent solid particles with the same height, and fill the transparent liquid and the transparent solid particles alternately in sequence.

[0032] 3) When the transparent soil reaches the designed height of the bottom of the model pile, several model piles are installed at the corresponding positions of each pile mold, and the transparent soil is continuously filled into the transparent model groove to reach the final designed height.

[0033] 4) Fix the cap to the upper ends of several model piles, and fill holes I and II with water.

[0034] 5) Place the four lifting brackets on the optical platform and adjust the positions, and adjust the heights of the infrared thermal imager, CCD industrial camera and laser transmitter. Connect the infrared thermal imager and CCD industrial camera to the computer and debug them.

[0035] 6) Apply vertical load to the foundation. After the settlement is stable, insert a heating rod or a cooling rod into hole I through hole II to apply temperature load to the model pile. During this process, the infrared thermal imager, CCD industrial camera and laser transmitter are always kept on.

[0036] 7) The infrared thermal imager and CCD industrial camera send the collected information to a computer for analysis and processing.

[0037] The beneficial effects of the present invention are:

[0038] 1. It can simulate four engineering conditions: end-bearing pile-pile group low cap, end-bearing pile-pile group high cap, friction pile-pile group high cap, friction pile-pile group low cap, explore the thermodynamic response of energy piles under these four conditions, and improve the singleness brought by the current end-bearing friction single pile condition;

[0039] 2. Through specific test operations, we can explore the influence of pile groups on surrounding piles under temperature cycle loads, the change law of pile-soil temperature and displacement under different temperature gradients, and the change law of pile-soil temperature and displacement under hot and cold cycle loads, etc., to provide reference for the promotion and application of energy piles;

[0040] 3. Combining visualization technology with infrared temperature measurement, a continuous displacement field and temperature field are formed in the entire pile group-soil range under temperature cycle and vertical load, which makes up for the current energy pile model test that cannot achieve full coverage monitoring of the pile-soil temperature field and displacement field, and optimizes the test device for studying the thermodynamic characteristics of energy pile groups. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is an overall schematic diagram of the device of the present invention;

[0042] Figure 2 This is a schematic diagram of the interior of the transparent model tank;

[0043] Figure 3 This is a schematic diagram of the assembly of the cover plate and the pile form;

[0044] Figure 4 This is a schematic diagram of the model pile;

[0045] Figure 5 It is the top view of pile group and cap;

[0046] Figure 6This is a model diagram of a friction pile-pile group low cap in a transparent model groove of Example 1;

[0047] Figure 7 This is a model diagram of a friction pile-pile group high cap in a transparent model groove of Example 3;

[0048] Figure 8 This is a model diagram of the end bearing pile-pile group high cap in the transparent model groove of Example 5;

[0049] Fig. 9 This is a diagram of the end-bearing pile-pile group low cap model in the transparent model groove of Example 7.

[0050] In the figure: optical platform 1, lifting bracket 101, infrared thermal imager 102, CCD industrial camera 103, laser emitter 104, transparent model groove 2, transparent soil 201, end bearing groove 3, cover plate 301, flexible spring 302, pile mold 303, model pile 4, hole I 401, base 5 and hole II 501. DETAILED DESCRIPTION

[0051] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0052] Embodiment 1:

[0053] This embodiment discloses a transparent soil test device for measuring temperature-deformation of energy pile groups, comprising an optical platform 1 , a transparent model groove 2 and an end bearing groove 3 .

[0054] See also Figure 1 The optical platform 1 is provided with a transparent model slot 2 and four lifting brackets 101. The transparent model slot 2 is a rectangular slot with an upper opening. The four lifting brackets 101 are respectively located on four sides of the transparent model slot 2. An infrared thermal imager 102 is installed directly above the transparent model slot 2.

[0055] The lifting bracket 101 is provided with a vertical sliding bar, and the projection of the sliding bar of each lifting bracket 101 on the corresponding side wall of the transparent model slot 2 coincides with the central axis of the side wall. The infrared thermal imager 102, the laser emitter 104 and the CCD industrial camera 103 are slidably connected to the sliding bar, the infrared thermal imager 102 is located above the laser emitter 104, and the CCD industrial camera 103 is located below the laser emitter 104.

[0056] A plurality of end bearing grooves 3 are fixed at the bottom of the transparent model groove 2. The end bearing grooves 3 include a flexible spring 302 and a pile mold 303. The pile mold 303 is a vertical cylindrical structure. The inner wall of the pile mold 303 is coated with waterproof vaseline. The inner diameter of the pile mold 303 matches the outer diameter of the model pile 4.

[0057] The flexible spring 302 is installed in the pile mold 303 , and the lower end of the model pile 4 is inserted into the pile mold 303 .

[0058] See also Figure 4 The model pile 4 is provided with a coaxial hole Ⅰ401, which penetrates the upper end surface of the model pile 4, and the bottom of the hole Ⅰ401 is at a certain safety distance from the bottom of the model pile 4. Figure 5 In this embodiment, four end bearing grooves 3 and four corresponding model piles 4 are provided, and the four model piles 4 are arranged in an array.

[0059] The upper ends of the plurality of model piles 4 are connected to the cap 5, and the connection between the cap 5 and each model pile 4 is provided with a hole II 501 penetrating the upper and lower surfaces thereof, and the inner diameter of the hole II 501 is consistent with that of the hole I 401 and they are interconnected. The holes I 401 and II 501 are filled with water.

[0060] The transparent model tank 2 is filled with transparent soil 201, and the support 5 is located above the transparent soil 201. Figure 6 The lower surface of the cap 5 is flush with the upper surface of the transparent soil 201, forming a friction pile-pile group low cap model.

[0061] The transparent soil 201 includes a transparent liquid and transparent solid particles with the same refractive index, and the transparent liquid and the transparent solid particles are alternately filled into the transparent model groove 2 in layers.

[0062] Embodiment 2:

[0063] This embodiment is based on the test method of a transparent soil test device for measuring temperature-deformation of energy pile groups described in Embodiment 1, and includes the following steps:

[0064] 1) The transparent model tank 2 is placed on the optical platform 1, and a plurality of pile molds 303 are fixed at the bottom of the transparent model tank 2. The inner wall of the pile mold 303 is coated with waterproof vaseline, and a flexible spring 302 is installed in the pile mold 303. The waterproof vaseline prevents the transparent soil 201 from leaking and reduces the friction resistance of the side wall of the pile mold 303.

[0065] 2) Prepare a transparent liquid with the same refractive index as the transparent solid particles, first fill the transparent model tank 2 with 5 cm of transparent liquid, then fill the transparent solid particles with the same height, and fill the transparent liquid and the transparent solid particles alternately. The transparent liquid is n-dodecane and No. 15 white oil in a certain mass ratio, or a calcium bromide solution with a certain concentration.

[0066] 3) When the transparent soil 201 is close to the upper end of the pile mold 303, a plurality of model piles 4 are inserted into the corresponding pile molds 303, and the transparent soil 201 is continuously filled into the transparent model groove 2 until the final design height is reached.

[0067] 4) Fix the cap 5 on the upper ends of the plurality of model piles 4 and fill the holes I 401 and II 501 with water. The lower surface of the cap 5 is flush with the upper surface of the transparent soil 201 .

[0068] 5) Place the four lifting brackets 101 on the optical platform 1 and adjust the positions, and adjust the heights of the infrared thermal imager 102, CCD industrial camera 103 and laser emitter 104, so that the laser emitter 104, infrared thermal imager 102 and CCD industrial camera 103 are located at the central axis of the transparent model slot 2, turn on and adjust the laser emitter 104 so that the section formed by the center line of its light source is perpendicular to the side corresponding to the transparent model slot 2, and adjust the clarity of the speckle field. Connect the infrared thermal imager 102 and CCD industrial camera 103 to the computer, turn on the infrared thermal imager 102 and CCD industrial camera 103, and adjust the lens so that the captured picture can cover the entire pile-soil range. Further, adjust the focal length of the two so that the captured picture is saturated and clear.

[0069] 6) A vertical load is applied to the foundation 5. After the settlement is stable, a heating rod or a cooling rod is inserted into the hole I401 through the hole II501 to heat or cool the water inside the hole I401 to apply a temperature load to the model pile 4. During this process, the infrared thermal imager 102, the CCD industrial camera 103 and the laser transmitter 104 are always kept on.

[0070] 7) The infrared thermal imager 102 and the CCD industrial camera 103 send the collected information to the computer for analysis and processing. Specifically, the physical space pixels are converted into digital pixels using digital image processing software, and then the position changes of each pixel at different times are determined and connected into the entire displacement field. The infrared thermal imager 102 converts the invisible infrared energy in the entire pile-soil range and transmits it to the computer, which is processed into a visual thermal image. By viewing all the thermal images transmitted by the infrared thermal imager 102, the temperature of each point in the entire pile-soil range can be obtained, and then the pile-soil heat transfer temperature distribution in the entire range can be obtained, revealing the heat transfer process and mechanism.

[0071] Embodiment 3:

[0072] This embodiment discloses a transparent soil test device for measuring temperature-deformation of energy pile groups, comprising an optical platform 1 , a transparent model groove 2 and an end bearing groove 3 .

[0073] See also Figure 1 The optical platform 1 is provided with a transparent model slot 2 and four lifting brackets 101. The transparent model slot 2 is a rectangular slot with an upper opening. The four lifting brackets 101 are respectively located on four sides of the transparent model slot 2. An infrared thermal imager 102 is installed directly above the transparent model slot 2.

[0074] The lifting bracket 101 is provided with a vertical sliding bar, and the projection of the sliding bar of each lifting bracket 101 on the corresponding side wall of the transparent model slot 2 coincides with the central axis of the side wall. The infrared thermal imager 102, the laser emitter 104 and the CCD industrial camera 103 are slidably connected to the sliding bar, the infrared thermal imager 102 is located above the laser emitter 104, and the CCD industrial camera 103 is located below the laser emitter 104.

[0075] See also Figure 2 A plurality of end bearing grooves 3 are fixed at the bottom of the transparent model groove 2. The end bearing grooves 3 include a flexible spring 302 and a pile mold 303. The pile mold 303 is a vertical cylindrical structure, and the inner wall of the pile mold 303 is coated with waterproof vaseline.

[0076] The flexible spring 302 is installed in the pile mold 303 , and the lower end of the model pile 4 is inserted into the pile mold 303 .

[0077] See also Figure 4 The model pile 4 is provided with a hole Ⅰ401 coaxial therewith, and the hole Ⅰ401 penetrates the upper end surface of the model pile 4. Figure 5 In this embodiment, four end bearing grooves 3 and four corresponding model piles 4 are provided, and the four model piles 4 are arranged in an array.

[0078] The upper ends of the plurality of model piles 4 are connected to the cap 5. The connection between the cap 5 and each model pile 4 is provided with a hole II 501 penetrating the upper and lower surfaces thereof, and the hole II 501 is connected to the hole I 401. The holes I 401 and II 501 are filled with water.

[0079] The transparent model tank 2 is filled with transparent soil 201, and the support 5 is located above the transparent soil 201. The transparent soil 201 includes transparent liquid and transparent solid particles with the same refractive index, and the transparent liquid and the transparent solid particles are alternately filled into the transparent model tank 2 in layers. Figure 7 There is a gap between the lower surface of the foundation 5 and the upper surface of the transparent soil 201, forming a friction pile-group pile high foundation.

[0080] Embodiment 4:

[0081] This embodiment is based on the test method of a transparent soil test device for measuring temperature-deformation of energy pile groups described in Embodiment 3, and includes the following steps:

[0082] 1) The transparent model tank 2 is placed on the optical platform 1, and a plurality of pile molds 303 are fixed at the bottom of the transparent model tank 2. The inner wall of the pile mold 303 is coated with waterproof vaseline, and a flexible spring 302 is installed in the pile mold 303. The waterproof vaseline prevents the transparent soil 201 from leaking and reduces the friction resistance of the side wall of the pile mold 303.

[0083] 2) Prepare a transparent liquid with the same refractive index as the transparent solid particles, first fill the transparent model tank 2 with 5 cm of transparent liquid, then fill the transparent solid particles with the same height, and fill the transparent liquid and the transparent solid particles alternately. The transparent liquid is n-dodecane and No. 15 white oil in a certain mass ratio, or a calcium bromide solution with a certain concentration.

[0084] 3) When the transparent soil 201 is close to the upper end of the pile mold 303, a plurality of model piles 4 are inserted into the corresponding pile molds 303, and the transparent soil 201 is continuously filled into the transparent model groove 2 until the final design height is reached.

[0085] 4) Fix the cap 5 on the upper ends of the plurality of model piles 4 and fill the holes I 401 and II 501 with water. There is a gap between the lower surface of the cap 5 and the upper surface of the transparent soil 201 .

[0086] 5) Place the four lifting brackets 101 on the optical platform 1 and adjust the positions, and adjust the heights of the infrared thermal imager 102, CCD industrial camera 103 and laser emitter 104, so that the laser emitter 104, infrared thermal imager 102 and CCD industrial camera 103 are located at the central axis of the transparent model slot 2, turn on and adjust the laser emitter 104 so that the section formed by the center line of its light source is perpendicular to the side corresponding to the transparent model slot 2, and adjust the clarity of the speckle field. Connect the infrared thermal imager 102 and CCD industrial camera 103 to the computer, turn on the infrared thermal imager 102 and CCD industrial camera 103, and adjust the lens so that the captured picture can cover the entire pile-soil range. Further, adjust the focal length of the two so that the captured picture is saturated and clear.

[0087] 6) A vertical load is applied to the foundation 5. After the settlement is stable, a heating rod or a cooling rod is inserted into the hole I401 through the hole II501 to heat or cool the water inside the hole I401 to apply a temperature load to the model pile 4. During this process, the infrared thermal imager 102, the CCD industrial camera 103 and the laser transmitter 104 are always kept on.

[0088] 7) The infrared thermal imager 102 and the CCD industrial camera 103 send the collected information to the computer for analysis and processing. Specifically, the physical space pixels are converted into digital pixels using digital image processing software, and then the position changes of each pixel at different times are determined and connected into the entire displacement field. The infrared thermal imager 102 converts the invisible infrared energy in the entire pile-soil range and transmits it to the computer, which is processed into a visual thermal image. By viewing all the thermal images transmitted by the infrared thermal imager 102, the temperature of each point in the entire pile-soil range can be obtained, and then the pile-soil heat transfer temperature distribution in the entire range can be obtained, revealing the heat transfer process and mechanism.

[0089] Embodiment 5:

[0090] This embodiment discloses a transparent soil test device for measuring temperature-deformation of energy pile groups, comprising an optical platform 1 , a transparent model groove 2 and an end bearing groove 3 .

[0091] See also Figure 1 The optical platform 1 is provided with a transparent model slot 2 and four lifting brackets 101. The transparent model slot 2 is a rectangular slot with an upper opening. The four lifting brackets 101 are respectively located on four sides of the transparent model slot 2. An infrared thermal imager 102 is installed directly above the transparent model slot 2.

[0092] The lifting bracket 101 is provided with a vertical sliding bar, and the projection of the sliding bar of each lifting bracket 101 on the corresponding side wall of the transparent model slot 2 coincides with the central axis of the side wall. The infrared thermal imager 102, the laser emitter 104 and the CCD industrial camera 103 are slidably connected to the sliding bar, the infrared thermal imager 102 is located above the laser emitter 104, and the CCD industrial camera 103 is located below the laser emitter 104.

[0093] The bottom of the transparent model tank 2 is fixed with a plurality of end bearing grooves 3, see Figure 3 The end bearing groove 3 includes a cover plate 301 and a pile mold 303. The pile mold 303 is a vertical cylindrical structure, and the inner wall of the pile mold 303 is coated with waterproof vaseline.

[0094] The cover plate 301 is sealed on the pile form 303, and the lower end of the model pile 4 is arranged on the upper end of the cover plate 301. Figure 4 The model pile 4 is provided with a hole Ⅰ401 coaxial therewith, and the hole Ⅰ401 penetrates the upper end surface of the model pile 4. Figure 5 In this embodiment, four end bearing grooves 3 and four corresponding model piles 4 are provided, and the four model piles 4 are arranged in an array.

[0095] The upper ends of the plurality of model piles 4 are connected to the cap 5. The connection between the cap 5 and each model pile 4 is provided with a hole II 501 penetrating the upper and lower surfaces thereof, and the hole II 501 is connected to the hole I 401. The holes I 401 and II 501 are filled with water.

[0096] The transparent model tank 2 is filled with transparent soil 201, and the support 5 is located above the transparent soil 201. The transparent soil 201 includes transparent liquid and transparent solid particles with the same refractive index, and the transparent liquid and the transparent solid particles are alternately filled into the transparent model tank 2 in layers. Figure 8 There is a gap between the lower surface of the cap 5 and the upper surface of the transparent soil 201, forming an end-bearing pile-group high cap.

[0097] Embodiment 6:

[0098] This embodiment is based on the test method of a transparent soil test device for measuring temperature-deformation of energy pile groups described in Embodiment 5, and includes the following steps:

[0099] 1) The transparent model tank 2 is placed on the optical platform 1 , and a plurality of pile molds 303 are fixed at the bottom of the transparent model tank 2 . The inner wall of the pile mold 303 is coated with waterproof vaseline, and the cover plate 301 is sealed on the pile mold 303 .

[0100] 2) Prepare a transparent liquid with the same refractive index as the transparent solid particles, first fill the transparent model tank 2 with 5 cm of transparent liquid, then fill the transparent solid particles with the same height, and fill the transparent liquid and the transparent solid particles alternately. The transparent liquid is n-dodecane and No. 15 white oil in a certain mass ratio, or a calcium bromide solution with a certain concentration.

[0101] 3) When the transparent soil 201 reaches the designed height of the bottom of the model pile 4, multiple model piles 4 are installed to the corresponding positions of each pile mold 303, and the transparent soil 201 is continuously filled into the transparent model groove 2 to reach the final designed height.

[0102] 4) Fix the cap 5 on the upper ends of the plurality of model piles 4 and fill the holes I 401 and II 501 with water. There is a gap between the lower surface of the cap 5 and the upper surface of the transparent soil 201 .

[0103] 5) Place the four lifting brackets 101 on the optical platform 1 and adjust the positions, and adjust the heights of the infrared thermal imager 102, CCD industrial camera 103 and laser emitter 104, so that the laser emitter 104, infrared thermal imager 102 and CCD industrial camera 103 are located at the central axis of the transparent model slot 2, turn on and adjust the laser emitter 104 so that the section formed by the center line of its light source is perpendicular to the side corresponding to the transparent model slot 2, and adjust the clarity of the speckle field. Connect the infrared thermal imager 102 and CCD industrial camera 103 to the computer, turn on the infrared thermal imager 102 and CCD industrial camera 103, and adjust the lens so that the captured picture can cover the entire pile-soil range. Further, adjust the focal length of the two so that the captured picture is saturated and clear.

[0104] 6) A vertical load is applied to the foundation 5. After the settlement is stable, a heating rod or a cooling rod is inserted into the hole I401 through the hole II501 to heat or cool the water inside the hole I401 to apply a temperature load to the model pile 4. During this process, the infrared thermal imager 102, the CCD industrial camera 103 and the laser transmitter 104 are always kept on.

[0105] 7) The infrared thermal imager 102 and the CCD industrial camera 103 send the collected information to the computer for analysis and processing. Specifically, the physical space pixels are converted into digital pixels using digital image processing software, and then the position changes of each pixel at different times are determined and connected into the entire displacement field. The infrared thermal imager 102 converts the invisible infrared energy in the entire pile-soil range and transmits it to the computer, which is processed into a visual thermal image. By viewing all the thermal images transmitted by the infrared thermal imager 102, the temperature of each point in the entire pile-soil range can be obtained, and then the pile-soil heat transfer temperature distribution in the entire range can be obtained, revealing the heat transfer process and mechanism.

[0106] Embodiment 7:

[0107] This embodiment discloses a transparent soil test device for measuring temperature-deformation of energy pile groups, comprising an optical platform 1 , a transparent model groove 2 and an end bearing groove 3 .

[0108] See also Figure 1 The optical platform 1 is provided with a transparent model slot 2 and four lifting brackets 101. The transparent model slot 2 is a rectangular slot with an upper opening. The four lifting brackets 101 are respectively located on four sides of the transparent model slot 2. An infrared thermal imager 102 is installed directly above the transparent model slot 2.

[0109] The lifting bracket 101 is provided with a vertical sliding bar, and the projection of the sliding bar of each lifting bracket 101 on the corresponding side wall of the transparent model slot 2 coincides with the central axis of the side wall. The infrared thermal imager 102, the laser emitter 104 and the CCD industrial camera 103 are slidably connected to the sliding bar, the infrared thermal imager 102 is located above the laser emitter 104, and the CCD industrial camera 103 is located below the laser emitter 104.

[0110] A plurality of end bearing grooves 3 are fixed to the bottom of the transparent model groove 2. The end bearing grooves 3 include a cover plate 301 and a pile mold 303. The pile mold 303 is a vertical cylindrical structure. The inner wall of the pile mold 303 is coated with waterproof vaseline.

[0111] The cover plate 301 is sealed on the pile form 303 , and the lower end of the model pile 4 is arranged on the cover plate 301 .

[0112] See also Figure 4 The model pile 4 is provided with a hole Ⅰ401 coaxial therewith, and the hole Ⅰ401 penetrates the upper end surface of the model pile 4. Figure 5 In this embodiment, four end bearing grooves 3 and four corresponding model piles 4 are provided, and the four model piles 4 are arranged in an array.

[0113] The upper ends of the plurality of model piles 4 are connected to the cap 5. The connection between the cap 5 and each model pile 4 is provided with a hole II 501 penetrating the upper and lower surfaces thereof, and the hole II 501 is connected to the hole I 401. The holes I 401 and II 501 are filled with water.

[0114] The transparent model tank 2 is filled with transparent soil 201, and the support 5 is located above the transparent soil 201. The transparent soil 201 includes transparent liquid and transparent solid particles with the same refractive index, and the transparent liquid and the transparent solid particles are alternately filled into the transparent model tank 2 in layers. Fig. 9 The lower surface of the cap 5 is flush with the upper surface of the transparent soil 201, forming an end-bearing pile-group low cap structure.

[0115] Embodiment 8:

[0116] This embodiment is based on the test method of a transparent soil test device for measuring temperature-deformation of energy pile groups described in Embodiment 7, and includes the following steps:

[0117] 1) The transparent model tank 2 is placed on the optical platform 1 , and a plurality of pile molds 303 are fixed at the bottom of the transparent model tank 2 . The inner wall of the pile mold 303 is coated with waterproof vaseline, and the cover plate 301 is sealed on the pile mold 303 .

[0118] 2) Prepare a transparent liquid with the same refractive index as the transparent solid particles, first fill the transparent model tank 2 with 5 cm of transparent liquid, then fill the transparent solid particles with the same height, and fill the transparent liquid and the transparent solid particles alternately. The transparent liquid is n-dodecane and No. 15 white oil in a certain mass ratio, or a calcium bromide solution with a certain concentration.

[0119] 3) When the transparent soil 201 reaches the designed height of the bottom of the model pile 4, multiple model piles 4 are installed to the corresponding positions of each pile mold 303, and the transparent soil 201 is continuously filled into the transparent model groove 2 to reach the final designed height.

[0120] 4) Fix the cap 5 on the upper ends of the plurality of model piles 4 and fill the holes I 401 and II 501 with water. The lower surface of the cap 5 is flush with the upper surface of the transparent soil 201 .

[0121] 5) Place the four lifting brackets 101 on the optical platform 1 and adjust the positions, and adjust the heights of the infrared thermal imager 102, CCD industrial camera 103 and laser emitter 104, so that the laser emitter 104, infrared thermal imager 102 and CCD industrial camera 103 are located at the central axis of the transparent model slot 2, turn on and adjust the laser emitter 104 so that the section formed by the center line of its light source is perpendicular to the side corresponding to the transparent model slot 2, and adjust the clarity of the speckle field. Connect the infrared thermal imager 102 and CCD industrial camera 103 to the computer, turn on the infrared thermal imager 102 and CCD industrial camera 103, and adjust the lens so that the captured picture can cover the entire pile-soil range. Further, adjust the focal length of the two so that the captured picture is saturated and clear.

[0122] 6) A vertical load is applied to the foundation 5. After the settlement is stable, a heating rod or a cooling rod is inserted into the hole I401 through the hole II501 to heat or cool the water inside the hole I401 to apply a temperature load to the model pile 4. During this process, the infrared thermal imager 102, the CCD industrial camera 103 and the laser transmitter 104 are always kept on.

[0123] 7) The infrared thermal imager 102 and the CCD industrial camera 103 send the collected information to the computer for analysis and processing. Specifically, the physical space pixels are converted into digital pixels using digital image processing software, and then the position changes of each pixel at different times are determined and connected into the entire displacement field. The infrared thermal imager 102 converts the invisible infrared energy in the entire pile-soil range and transmits it to the computer, which is processed into a visual thermal image. By viewing all the thermal images transmitted by the infrared thermal imager 102, the temperature of each point in the entire pile-soil range can be obtained, and then the pile-soil heat transfer temperature distribution in the entire range can be obtained, revealing the heat transfer process and mechanism.

[0124] Embodiment 9:

[0125] This embodiment discloses a transparent soil test device for measuring temperature-deformation of energy pile groups, comprising an optical platform 1 , a transparent model groove 2 and an end bearing groove 3 .

[0126] See also Figure 1 The optical platform 1 is provided with a transparent model slot 2 and four lifting brackets 101. The transparent model slot 2 is a rectangular slot with an upper opening. The four lifting brackets 101 are respectively located on four sides of the transparent model slot 2. An infrared thermal imager 102 is installed directly above the transparent model slot 2.

[0127] The lifting bracket 101 is provided with a vertical sliding bar, and the projection of the sliding bar of each lifting bracket 101 on the corresponding side wall of the transparent model slot 2 coincides with the central axis of the side wall. The infrared thermal imager 102, the laser emitter 104 and the CCD industrial camera 103 are slidably connected to the sliding bar, the infrared thermal imager 102 is located above the laser emitter 104, and the CCD industrial camera 103 is located below the laser emitter 104.

[0128] A plurality of end bearing grooves 3 are fixed at the bottom of the transparent model groove 2. The end bearing grooves 3 include a cover plate 301, a flexible spring 302 and a pile mold 303. The pile mold 303 is a vertical cylindrical structure. The inner wall of the pile mold 303 is coated with waterproof vaseline. The inner diameter of the pile mold 303 matches the outer diameter of the model pile 4.

[0129] In working state I, the flexible spring 302 is installed in the pile mold 303, and the lower end of the model pile 4 is inserted into the pile mold 303.

[0130] In working state II, the cover plate 301 is sealed on the pile form 303 , and the model pile 4 is arranged on the cover plate 301 .

[0131] See also Figure 4 The model pile 4 is provided with a coaxial hole Ⅰ401, which penetrates the upper end surface of the model pile 4, and the bottom of the hole Ⅰ401 is at a certain safety distance from the bottom of the model pile 4. Figure 5 In this embodiment, four end bearing grooves 3 and four corresponding model piles 4 are provided, and the four model piles 4 are arranged in an array.

[0132] The upper ends of the plurality of model piles 4 are connected to the cap 5, and the connection between the cap 5 and each model pile 4 is provided with a hole II 501 penetrating the upper and lower surfaces thereof, and the inner diameter of the hole II 501 is consistent with that of the hole I 401 and they are interconnected. The holes I 401 and II 501 are filled with water.

[0133] The transparent model groove 2 is filled with transparent soil 201, which includes transparent liquid and transparent solid particles with consistent refractive index. The transparent liquid and the transparent solid particles are alternately filled into the transparent model groove 2 in layers.

[0134] The support platform 5 is located above the transparent soil 201. Figures 6 to 9 This embodiment can simulate the friction pile-pile group low cap structure, the friction pile-pile group high cap structure, the end bearing pile-pile group high cap structure and the end bearing pile-pile group low cap structure respectively.

Claims

1. A transparent soil test device for measuring temperature and deformation of energy pile groups, characterized by: It comprises an optical platform (1), a transparent model groove (2) and an end bearing groove (3); A transparent model slot (2) and four lifting brackets (101) are installed on the optical platform (1); the transparent model slot (2) is a rectangular slot with an open top; the four lifting brackets (101) are respectively located on four sides of the transparent model slot (2); an infrared thermal imager (102) is installed directly above the transparent model slot (2); An infrared thermal imager (102), a laser emitter (104) and a CCD industrial camera (103) are slidably connected to each lifting bracket (101), wherein the infrared thermal imager (102) is located above the laser emitter (104), and the CCD industrial camera (103) is located below the laser emitter (104); A plurality of end bearing grooves (3) are fixed at the bottom of the transparent model groove (2), and the end bearing grooves (3) include a cover plate (301), a flexible spring (302) and a pile mold (303), and the pile mold (303) is a vertical cylindrical structure, and the inner wall of the pile mold (303) is coated with waterproof vaseline; In working state I, the flexible spring (302) is installed in the pile mold (303); In working state II, the cover plate (301) is sealed on the pile form (303); A model pile (4) is arranged at the upper end of each end bearing groove (3), and a hole I (401) coaxial with the model pile (4) is arranged on the model pile (4), and the hole I (401) penetrates the upper end surface of the model pile (4); The upper ends of the plurality of model piles (4) are connected to a cap (5), and a hole II (501) penetrating the upper and lower surfaces of the cap (5) and each model pile (4) is provided at the connection point, and the hole II (501) is connected to the hole I (401); the hole I (401) and the hole II (501) are filled with water; The transparent model groove (2) is filled with transparent soil (201), and the support platform (5) is located above the transparent soil (201); the transparent soil (201) comprises a transparent liquid and transparent solid particles with a consistent refractive index, and the transparent liquid and the transparent solid particles are alternately filled into the transparent model groove (2) in layers.

2. The transparent soil testing device for measuring temperature and deformation of energy pile groups according to claim 1 is characterized by: A vertical sliding rod is arranged on the lifting bracket (101), and the infrared thermal imager (102), the laser transmitter (104) and the CCD industrial camera (103) are slidably connected to the sliding rod.

3. The transparent soil testing device for measuring temperature and deformation of energy pile groups according to claim 2 is characterized by: The projection of the sliding rod of each lifting bracket (101) on the corresponding side wall of the transparent model groove (2) coincides with the central axis of the side wall.

4. The transparent soil testing device for measuring temperature and deformation of energy pile groups according to claim 1 is characterized by: The lower surface of the support platform (5) is flush with the upper surface of the transparent soil (201).

5. The transparent soil testing device for measuring temperature and deformation of energy pile groups according to claim 1 is characterized by: There is a gap between the lower surface of the support (5) and the upper surface of the transparent soil (201).

6. A test method based on the energy pile group temperature-deformation measurement transparent soil test device according to claim 1, characterized in that: The following steps are involved: 1) placing the transparent model tank (2) on an optical platform (1), fixing a plurality of pile molds (303) at the bottom of the transparent model tank (2), applying waterproof vaseline on the inner wall of the pile mold (303), and installing a flexible spring (302) in the pile mold (303); 2) preparing a transparent liquid having a refractive index consistent with that of the transparent solid particles, first filling the transparent model tank (2) with the transparent liquid to a predetermined height, and then filling the transparent solid particles to the same height, and the transparent liquid and the transparent solid particles are filled alternately in sequence; 3) When the transparent soil (201) is close to the upper end of the pile mold (303), a plurality of model piles (4) are inserted into the corresponding pile molds (303), and the transparent soil (201) is continuously filled into the transparent model groove (2) until the final design height is reached; 4) fixing the cap (5) on the upper ends of a plurality of model piles (4), and filling the hole I (401) and the hole II (501) with water; 5) placing the four lifting brackets (101) on the optical platform (1) and adjusting their positions, and adjusting the heights of the infrared thermal imager (102), the CCD industrial camera (103) and the laser transmitter (104), connecting the infrared thermal imager (102) and the CCD industrial camera (103) to a computer and debugging them; 6) applying a vertical load to the foundation (5), and after the settlement is stable, inserting a heating rod or a cooling rod into the hole I (401) through the hole II (501) to apply a temperature load to the model pile (4), during which the infrared thermal imager (102), the CCD industrial camera (103) and the laser transmitter (104) are always kept in an on state; 7) The infrared thermal imager (102) and the CCD industrial camera (103) send the collected information to a computer for analysis and processing.

7. A test method based on the energy pile group temperature-deformation measurement transparent soil test device according to claim 1, characterized in that: The following steps are involved: 1) placing the transparent model tank (2) on an optical platform (1), fixing a plurality of pile molds (303) at the bottom of the transparent model tank (2), applying waterproof vaseline on the inner wall of the pile mold (303), and sealing the cover plate (301) on the pile mold (303); 2) preparing a transparent liquid having a refractive index consistent with that of the transparent solid particles, first filling the transparent model tank (2) with the transparent liquid to a predetermined height, and then filling the transparent solid particles to the same height, and the transparent liquid and the transparent solid particles are filled alternately in sequence; 3) When the transparent soil (201) reaches the designed height of the bottom of the model pile (4), a plurality of model piles (4) are installed at the corresponding positions of each pile mold (303), and the transparent soil (201) is continuously filled into the transparent model groove (2) until the final designed height is reached; 4) fixing the cap (5) on the upper ends of a plurality of model piles (4), and filling the hole I (401) and the hole II (501) with water; 5) placing the four lifting brackets (101) on the optical platform (1) and adjusting their positions, and adjusting the heights of the infrared thermal imager (102), the CCD industrial camera (103) and the laser transmitter (104), connecting the infrared thermal imager (102) and the CCD industrial camera (103) to a computer and debugging them; 6) applying a vertical load to the foundation (5), and after the settlement is stable, inserting a heating rod or a cooling rod into the hole I (401) through the hole II (501) to apply a temperature load to the model pile (4), during which the infrared thermal imager (102), the CCD industrial camera (103) and the laser transmitter (104) are always kept in an on state; 7) The infrared thermal imager (102) and the CCD industrial camera (103) send the collected information to a computer for analysis and processing.

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