Transparent soil test device and test method for simulating energy tunnel construction

Abstract

The invention discloses a transparent soil test device and test method for simulating energy tunnel construction, and belongs to the technical field of tunnel construction simulation. A transparent soil test device for simulating energy tunnel construction comprises a simulation table, the simulation table comprises a workbench, a model box is arranged on the upper surface of the workbench, a fixing mechanism for fixing the model box is arranged on the workbench, and an optical system is arranged on the workbench; the model box comprises a box body, a bottom plate is arranged at the bottom of the box body, a heating wire for heating the transparent soil in the box body is arranged outside the box body along the axial direction of the simulation tunnel, and a stretching mechanism for driving the heating wire to slide up and down is arranged on the bottom plate. By adopting the transparent soil test device and test method for simulating energy tunnel construction, the problem that an existing transparent soil test device cannot meet energy tunnel excavation simulation can be solved, and the simulation precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction simulation, and in particular to a transparent soil test device and a test method for simulating energy tunnel construction. Background Art

[0002] The tunnel transparent soil test is an experimental method used to study the mechanical behavior and soil response during tunnel excavation. Transparent soil is a special simulation material with transparency, and the internal stress and deformation can be observed by optical methods. The transparent soil test includes a model box, an optical system and a data acquisition system. The model box is used to hold the transparent soil; the optical system is a laser light source and a camera, which is used to capture the speckle image inside the transparent soil; the data acquisition system is used to record and analyze the test data. The data analysis uses PIV technology to compare the grayscale values ​​of the images at different times, and uses the correlation function to obtain the relative displacement at different times, thereby obtaining the macroscopic deformation process inside the tunnel soil.

[0003] The existing patent CN202210472759.4 discloses a transparent soil model test device and a test method for simulating the displacement field changes of the surrounding soil caused by the tunnel excavation of a shield machine. The method includes the following steps: 1) Install the test device; 2) Clean the test device and wipe it clean; 3) Prepare transparent soil in the transparent soil model box and conduct a sealing test; 4) Disassemble the test device for re-cleaning and wiping it clean; 5) Reassemble the test device and prepare transparent soil in the transparent soil model box, and let it stand for 24 hours; 6) Arrange the industrial camera and laser transmitter; 7) Turn on the laser transmitter and adjust the industrial camera; 8) Start the cutter head to drive the simulation device to rotate and move forward at a uniform speed. After the excavation is completed, separate the other devices connected to the shield machine simulation device and let it stand, and continuously record the changes in the transparent soil speckle field; 9) Save the image and data and analyze and process it. The present invention can truly simulate the process of tunnel excavation by a shield machine, and can accurately monitor the changes in the displacement field of the soil around the shield machine simulation device. The above patent studies tunnel excavation by simulating the drilling process of a shield machine. However, when simulating the shield machine drilling, the model box is impacted by the simulation device, and the stability of the model box is relatively poor. In addition, the above patent can only simulate the excavation process of ordinary tunnels. For energy tunnels, due to the presence of geothermal resources in the tunnel, the temperature has a certain impact on the soil, and the above patent cannot simulate the excavation process of energy tunnels. Summary of the invention

[0004] The purpose of the present invention is to provide a transparent soil test device and a test method for simulating energy tunnel construction, so as to solve the problem that the existing transparent soil test device cannot meet the requirements of energy tunnel excavation simulation.

[0005] To achieve the above-mentioned purpose, the present invention provides a transparent soil testing device for simulating energy tunnel construction, comprising a simulation platform, the simulation platform comprising a workbench, a model box is arranged on the upper surface of the workbench, a fixing mechanism for fixing the model box is arranged on the workbench, and an optical system is arranged on the workbench; the model box comprises a box body, a bottom plate is arranged at the bottom of the box body, a heating wire for heating the transparent soil in the box body is arranged on the outside of the box body along the axial direction of the simulated tunnel, and an extension mechanism for driving the heating wire to slide up and down is arranged on the bottom plate.

[0006] Preferably, the fixing mechanism includes a mounting seat, which is arranged on the upper surface of the workbench, and a card slot for placing the box is arranged on the upper surface of the mounting seat, and pressure blocks for pressing the box are arranged on both sides of the card slot, and a third mounting slot for installing the pressure block is arranged on the side wall of the card slot, and the middle part of the pressure block is rotatably connected to the third mounting slot through a rotating shaft, and the third mounting slot and the pressure block are provided with a torsion spring for causing one end of the pressure block close to the box to rotate upward; a rotating structure for driving the pressure block to rotate and press the box is arranged inside the mounting seat.

[0007] Preferably, the rotating structure includes a lifting block, and the end of the pressing block away from the box body contacts the upper surface of the lifting block under the action of the torsion spring, and a second mounting groove for accommodating the lifting block is provided on the mounting seat, and the second mounting groove is connected with the third mounting groove, and the lifting block moves up and down along the second mounting groove, and a sliding rod is provided below the lifting block, and a sliding hole for allowing the sliding rod to pass through is provided at the bottom of the second mounting groove, and a third spring is provided between the lifting block and the second mounting groove to apply downward pulling force to the lifting block, and a lifting assembly is provided inside the mounting seat to drive the lifting block to rise and fall through the sliding rod.

[0008] Preferably, the lifting assembly includes a slide plate, a slide groove for accommodating the slide plate is arranged inside the mounting seat, the slide plate slides along the slide groove, a second inclined surface is arranged on the upper surface of the slide plate, and the bottom end of the slide rod contacts the second inclined surface under the action of a third spring; a sliding structure for driving the slide plate to slide is arranged on the mounting seat.

[0009] Preferably, the sliding structure includes a top plate, a first mounting groove for accommodating the top plate is provided in the card slot, a transmission rod is provided on the lower surface of the top plate, a limiting groove for allowing the transmission rod to pass through is provided at the bottom of the first mounting groove, the first mounting groove is connected with the slide groove through the limiting groove, a hole for allowing the slide plate to pass through is provided on the transmission rod, the top of the hole is an inclined surface adapted to the first inclined surface of the slide plate, the inclination directions of the first inclined surface and the second inclined surface are opposite, a first spring for applying an upward thrust to the top plate is provided between the top plate and the first mounting groove, and a second spring for applying an outward thrust to the slide plate is provided between the slide plate and the slide groove; a locking structure for locking the slide plate is provided on the mounting seat.

[0010] Preferably, the locking structure includes a guide sleeve, which is fixedly connected to the mounting seat, the slide plate is located in the guide sleeve, a fixing sleeve is provided on the side wall of the guide sleeve, a locking pin is slidably provided in the fixing sleeve, a through hole for the locking pin to pass through is provided on the guide sleeve, a locking hole for the locking pin to be inserted is provided on the slide plate, a fixing plate is provided on the locking pin, the fixing plate is located in the fixing sleeve, a fourth spring is provided between the fixing plate and the guide sleeve to apply inward pulling force to the locking pin, and a handle is provided on the end of the locking pin extending out of the fixing sleeve.

[0011] Preferably, the extension mechanism includes a guide rod, which is fixed on the base plate and located at the four corners of the box body, and a first sliding sleeve, a second sliding sleeve and a third sliding sleeve are slidably arranged on the guide rod in sequence, and a first connecting rod is hinged on the first sliding sleeve, the top end of the first connecting rod is hinged to the bottom end of the second connecting rod, the middle part of the second connecting rod is hinged to the second sliding sleeve, the top end of the second connecting rod is hinged to the bottom end of the third connecting rod, and the top end of the third connecting rod is hinged to the third sliding sleeve; heating wires are arranged between the two first sliding sleeves, between the two second sliding sleeves, and between the two third sliding sleeves on the same side of the box body, and the heating wires are connected to an external power supply; a power structure for driving the first connecting rod to rotate is arranged on the base plate.

[0012] Preferably, the power structure includes a slide seat, which is perpendicular to the simulated tunnel, and a slide rail is provided on the bottom plate to guide the sliding of the slide seat along the axial direction of the simulated tunnel. Fixed pins are provided at both ends of the slide seat, and a long transmission hole for allowing the fixed pin to pass through is provided at the bottom end of the first connecting rod. The fixed pin is slidably connected to the transmission hole, and a top screw is provided on the slide seat to lock the slide seat and the slide rail.

[0013] Preferably, the optical system includes a laser, which is located directly above the box. The laser is arranged on a support frame, and the support frame is fixed on a workbench. An industrial camera is arranged on the workbench. The industrial camera is arranged along the axial and radial directions of the simulated tunnel, and the industrial camera is arranged perpendicular to the laser.

[0014] The test method based on the transparent soil test device for simulating energy tunnel construction comprises the following steps: S1. Clean and dry the box, and add the prepared transparent soil inside the box to the designed height; S2. Put the bottom plate of the box into the slot, press the top plate downward through the box, the top plate drives the slide plate to slide along the slide slot through the transmission rod and the first inclined surface, the first spring and the second spring are compressed; the slide plate drives the slide bar to slide upward through the second inclined surface, the slide bar drives the lifting block to slide upward, the lifting block drives the pressing block to rotate, and the third spring is extended; when the slide plate slides, the locking pin is inserted into the locking hole of the slide plate under the action of the fourth spring, the slide plate is locked, the pressing block presses the bottom plate, and the box is fixed; S3, place the box on the workbench, loosen the top screw, slide the slide, the slide drives the first connecting rod to rotate through the fixed pin and the transmission hole, the first connecting rod drives the second connecting rod to rotate, the second connecting rod drives the second sliding sleeve to slide along the guide rod, and drives the third connecting rod to rotate, the third connecting rod drives the third sliding sleeve to slide, the second sliding sleeve and the third sliding sleeve drive the heating wire to unfold, the heating wire is energized, and the transparent soil in the box is heated; after the heating is completed, slide the slide in the opposite direction, tighten the top screw, and move the heating wire to the bottom of the box; S4. Adjust the laser and the industrial camera, and the laser forms a speckle image in the transparent soil; start simulating tunnel construction through the shield machine simulation device, the liquid inlet of the shield model in the shield machine simulation device is connected to the liquid outlet of the external refrigerator or heater through a connecting pipe, and the liquid outlet of the shield model is connected to the liquid return end of the external refrigerator or heater through a connecting pipe. During the forward excavation process of the shield machine simulation device, the shield model moves forward, and a circulating medium is introduced into the flow channel through the refrigerator or heater to heat or cool the shield model; S5. The speckle image is collected by an industrial camera, and the image is processed and analyzed by PIV technology.

[0015] The advantages and positive effects of the transparent soil test device and test method for the construction of a simulated energy tunnel described in the present invention are: 1. The present invention is provided with a fixing mechanism for fixing the model box on the workbench. The fixing mechanism fixes the model box, thereby improving the stability of the model box and facilitating the simulation effect. The pressing block fixes the box body during the process of placing the box body on the workbench, which is convenient for operation.

[0016] 2. A heating wire is arranged on the outside of the box along the axial direction of the simulated tunnel to heat the transparent soil in the box. The transparent soil is heated by the heating wire, thereby simulating transparent soil of different temperatures in the energy tunnel, which is closer to the excavation conditions of the energy tunnel and improves the accuracy of the simulation.

[0017] 3. An extension mechanism is provided on the bottom plate to drive the heating wire to slide up and down. The first connecting rod of the extension mechanism is driven to rotate through the sliding seat. The first connecting rod drives the second sliding sleeve and the third sliding sleeve to slide along the guide rod through the second connecting rod and the third connecting rod, thereby unfolding the heating wire and improving the uniformity of heating the transparent soil in the box. Since the heating wire is folded up, it is prevented from blocking the box body by the heating wire, and the shooting effect of the industrial camera is improved.

[0018] 4. A spiral flow channel is set inside the shield model. The shield model is heated and cooled through the medium and the spiral flow channel to simulate the operation process of the energy tunnel.

[0019] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 2 A schematic diagram of the three-dimensional structure of a simulation platform according to an embodiment of the present invention; Figure 3 A schematic diagram of the cross-sectional structure of a simulation platform according to an embodiment of the present invention; Figure 4 A schematic diagram of the cross-sectional structure of a mounting seat according to an embodiment of the present invention; Figure 5 for Figure 4 Middle A enlarged view; Figure 6 It is a schematic diagram of the locking structure of an embodiment of the present invention; Figure 7 A schematic diagram of the three-dimensional structure of a model box according to an embodiment of the present invention; Figure 8 It is a schematic diagram of the structure of the extension mechanism of an embodiment of the present invention; Fig. 9 It is a schematic diagram of the partial structure of the extension mechanism of an embodiment of the present invention; Fig.10 A schematic diagram of the shield model structure according to an embodiment of the present invention; Fig.11 Schematic diagram of the internal structure of the shield model according to an embodiment of the present invention.

[0021] Reference numerals 1. Simulation table; 11. Workbench; 12. Support frame; 13. Laser; 14. Industrial camera; 15. Mounting seat; 16. Card slot; 17. Top plate; 18. Press block; 19. Slide plate; 110. First mounting slot; 111. Transmission rod; 112. First inclined plane; 113. Limiting slot; 114. First spring; 115. Slide slot; 116. Second spring; 117. Second inclined plane; 118. Slide bar; 119. Second mounting slot; 120. Lifting block; 121. Third spring; 122. Third mounting slot; 123. Guide sleeve; 124. Handle; 125. Fixing sleeve; 126. Locking pin; 127. Fixing plate; 128. Fourth spring; 2. Model box; 21. Box body; 22. Bottom plate; 23. Guide rod; 24. First sliding sleeve; 25. Second sliding sleeve; 26. Third sliding sleeve; 27. First connecting rod; 28. Second connecting rod; 29. ​​Third connecting rod; 210. Heating wire; 211. Sliding seat; 212. Sliding rail; 213. Transmission hole; 214. Fixing pin; 215. Socket; 3. Shield body model; 31. Flow channel; 32. Liquid inlet; 33. Liquid outlet. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application. In the event of any inconsistency, the meaning described in this specification or the meaning derived from the contents recorded in this specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application. In order to accurately describe the technical content in this application and to accurately understand the present invention, the following explanations or definitions are given to the terms used in this specification before describing the specific embodiments: The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown. A transparent soil test device for simulating energy tunnel construction includes a simulation platform 1, which is fixed on the ground. The simulation platform 1 includes a workbench 11, and a model box 2 is provided on the upper surface of the workbench 11, and a fixing mechanism for fixing the model box 2 is provided on the workbench 11. Fixing the model box 2 by the fixing mechanism improves the stability of the model box 2, which is beneficial to improving the simulation effect. An optical system is provided on the workbench 11. The optical system includes a laser 13, and the laser 13 is located directly above the box body 21. The laser 13 is arranged on a support frame 12, and the support frame 12 is fixed on the workbench 11. An industrial camera 14 is provided on the workbench 11, and two industrial cameras 14 are respectively arranged along the axial direction and radial direction of the simulated tunnel. The industrial camera 14 is arranged perpendicular to the laser 13.

[0025] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown. The fixing mechanism includes a mounting seat 15, and the mounting seat 15 is arranged at the center of the upper surface of the workbench 11, and the mounting seat 15 and the workbench 11 are an integral structure. A card slot 16 for placing the box body 21 is arranged on the upper surface of the mounting seat 15, and the card slot 16 is arranged along the length direction of the mounting seat 15. Both sides of the card slot 16 are provided with a pressing block 18 for pressing the box body 21, and the pressing block 18 is located in the middle of the card slot 16. A third mounting groove 122 for mounting the pressing block 18 is arranged on the side wall of the card slot 16, and the middle part of the pressing block 18 is rotatably connected to the third mounting groove 122 through a rotating shaft. A torsion spring is arranged between the third mounting groove 122 and the pressing block 18 to rotate the end of the pressing block 18 close to the box body 21 upward.

[0026] The mounting seat 15 is provided with a rotating structure for driving the pressing block 18 to rotate and press the box body 21. The rotating structure includes a lifting block 120, and the end of the pressing block 18 away from the box body 21 contacts the upper surface of the lifting block 120 under the action of the torsion spring. The mounting seat 15 is provided with a second mounting groove 119 for accommodating the lifting block 120, and the second mounting groove 119 is perpendicular to and connected with the third mounting groove 122. The lifting block 120 moves up and down along the second mounting groove 119. A sliding rod 118 is fixedly provided below the lifting block 120, and a sliding hole is provided at the bottom of the second mounting groove 119 for the sliding rod 118 to pass through, and the sliding rod 118 is slidably connected to the sliding hole. A third spring 121 is provided between the lifting block 120 and the second mounting groove 119 to apply a downward pulling force to the lifting block 120, and the third spring 121 is sleeved on the sliding rod 118, and the two ends of the third spring 121 are respectively fixedly connected to the lifting block 120 and the second mounting groove 119.

[0027] The mounting seat 15 is provided with a lifting assembly that drives the lifting block 120 to lift and lower through a slide rod 118. The lifting assembly includes a slide plate 19. The mounting seat 15 is provided with a slide groove 115 for accommodating the slide plate 19. The slide plate 19 slides along the slide groove 115. The slide groove 115 is connected to the second mounting groove 119 through a slide hole. The slide groove 115 is vertically arranged with the second mounting groove 119. The upper surfaces of the slide plate 19 are provided with second inclined surfaces 117 at both ends. The bottom end of the slide rod 118 contacts the second inclined surface 117 under the action of the third spring 121.

[0028] The mounting seat 15 is provided with a sliding structure for driving the slide plate 19 to slide. The sliding structure includes a top plate 17, and a first mounting groove 110 for accommodating the top plate 17 is provided in the card groove 16. A transmission rod 111 is fixedly provided on the lower surface of the top plate 17, and a limiting groove 113 is provided at the bottom of the first mounting groove 110 for the transmission rod 111 to pass through, and the transmission rod 111 is slidably connected to the limiting groove 113. The first mounting groove 110 is connected to the slide groove 115 through the limiting groove 113. A hole is provided on the transmission rod 111 for the slide plate 19 to pass through, and the top of the hole is an inclined surface adapted to the first inclined surface 112 of the slide plate 19. The first inclined surface 112 is located in the middle of the upper surface of the slide plate 19, and the inclination direction of the first inclined surface 112 is opposite to that of the second inclined surface 117. A first spring 114 is provided between the top plate 17 and the first mounting groove 110 to apply an upward thrust to the top plate 17. The first spring 114 is sleeved on the outside of the transmission rod 111, and the two ends of the first spring 114 are respectively fixedly connected to the top plate 17 and the first mounting groove 110. A second spring 116 is provided between the slide plate 19 and the slide groove 115 to apply an outward thrust to the slide plate 19, and the two ends of the second spring 116 are respectively fixedly connected to the slide groove 115 and the slide plate 19.

[0029] like Figure 6 As shown. A locking structure for locking the slide plate 19 is provided on the mounting seat 15. The locking structure includes a guide sleeve 123, and the guide sleeve 123 is fixedly connected to the mounting seat 15. The slide plate 19 is located in the guide sleeve 123. A fixing sleeve 125 is fixedly provided on the side wall of the guide sleeve 123, and a locking pin 126 is slidably provided in the fixing sleeve 125. A through hole for the locking pin 126 to pass through is provided on the guide sleeve 123, and the locking pin 126 is slidably connected to the through hole. A locking hole for the locking pin 126 to be inserted is provided on the slide plate 19. A fixing plate 127 is fixedly provided on the locking pin 126, and the fixing plate 127 is located in the fixing sleeve 125. A fourth spring 128 is provided between the fixing plate 127 and the guide sleeve 123 to apply an inward pulling force to the locking pin 126. The fourth spring 128 is sleeved on the locking pin 126, and the two ends of the fourth spring 128 are respectively fixedly connected to the fixing plate 127 and the guide sleeve 123. The locking pin 126 is inserted into the locking hole under the action of the fourth spring 128 to lock the slide plate 19, thereby improving the stability of the pressing block 18 pressing the model box 2. A handle 124 is provided at one end of the locking pin 126 extending out of the fixing sleeve 125.

[0030] like Figure 7As shown. The model box 2 includes a box body 21, and a bottom plate 22 is provided at the bottom of the box body 21. The size of the bottom plate 22 is larger than the size of the side wall of the box body 21, so that the bottom plate 22 can be pressed by the pressing block 18. An opening is provided at the top of the box body 21, and the four side walls of the box body 21 are made of highly transparent glass. The side walls of the box body 21 and the bottom plate 22 and the side walls are fixedly connected by adhesive sealing. The interior of the box body 21 is used to hold transparent soil, and the two side walls of the box body 21 are provided with a socket 215 for the shield machine simulation device to pass through.

[0031] The outside of the box 21 is provided with a heating wire 210 along the axial direction of the simulated tunnel to heat the transparent soil in the box 21. The transparent soil is heated by the heating wire 210, thereby simulating transparent soil of different temperatures in the energy tunnel, which is closer to the excavation of the energy tunnel and improves the accuracy of the simulation. The bottom of the box 21 is set at a certain height to facilitate the storage of the heating wire 210, reduce the obstruction of the heating wire 210 to the box 21, and improve the shooting effect of the industrial camera 14. An insulation layer composed of transparent glass can be set on the outside of the box 21, and the heating wire 210 is located in the insulation layer to improve the insulation effect of the transparent soil.

[0032] like Figure 8 As shown. An extension mechanism for driving the heating wire 210 to slide up and down is provided on the bottom plate 22. The extension mechanism includes a guide rod 23, which is fixed on the bottom plate 22 and located at the four corners of the box body 21. A first sliding sleeve 24, a second sliding sleeve 25 and a third sliding sleeve 26 are provided on the guide rod 23 to slide from bottom to top in sequence. A first connecting rod 27 is hinged on the first sliding sleeve 24, and the top end of the first connecting rod 27 is hinged to the bottom end of the second connecting rod 28. The middle part of the second connecting rod 28 is hinged to the second sliding sleeve 25, and the top end of the second connecting rod 28 is hinged to the bottom end of the third connecting rod 29. The top end of the third connecting rod 29 is hinged to the third sliding sleeve 26. A heating wire 210 is provided between the two first sliding sleeves 24, between the two second sliding sleeves 25, and between the two third sliding sleeves 26 on the same side of the box body 21, and the heating wire 210 is connected to an external power supply.

[0033] A power structure for driving the first connecting rod 27 to rotate is provided on the bottom plate 22. The first connecting rod 27 drives the second sliding sleeve 25 and the third sliding sleeve 26 to slide along the guide rod 23 through the second connecting rod 28 and the third connecting rod 29, thereby unfolding the heating wire 210 to improve the uniformity of heating the transparent soil in the box body 21.

[0034] like Fig. 9As shown. The power structure includes a slide 211, and the slide 211 is perpendicular to the simulated tunnel. A slide rail 212 is fixedly provided on the bottom plate 22 to guide the sliding of the slide 211 along the axial direction of the simulated tunnel, and fixed pins 214 are fixedly provided at both ends of the slide 211. A long strip-shaped transmission hole 213 is provided at the bottom end of the first connecting rod 27 for the fixed pin 214 to pass through, and the fixed pin 214 is slidably connected to the transmission hole 213. The slide 211 drives the first connecting rod 27 to rotate through the fixed pin 214 and the transmission hole 213. A top screw is provided on the slide 211 to lock the slide 211 and the slide rail 212.

[0035] The test method based on the transparent soil test device for simulating energy tunnel construction comprises the following steps: S1, clean and dry the box 21, and add the prepared transparent soil to the designed height inside the box 21. When adding the transparent soil into the box 21, use a film to block the plug hole 215 to prevent the liquid in the transparent soil from flowing out from the plug hole 215.

[0036] S2. Place the bottom plate 22 of the box 21 into the slot 16, and press the top plate 17 downward through the box 21. The top plate 17 drives the slide plate 19 to slide along the slide slot 115 through the transmission rod 111 and the first inclined surface 112, and the first spring 114 and the second spring 116 are compressed. The slide plate 19 drives the slide bar 118 to slide upward through the second inclined surface 117, and the slide bar 118 drives the lifting block 120 to slide upward. The lifting block 120 drives the pressing block 18 to rotate, and the third spring 121 extends. When the slide plate 19 slides, the locking pin 126 is inserted into the locking hole of the slide plate 19 under the action of the fourth spring 128 to lock the slide plate 19. The pressing block 18 presses the bottom plate 22 to fix the box 21.

[0037] By pulling the locking pin 126 outwards by the handle 124 , the first spring, the second spring 116 , and the third spring 121 are reset, and the box body 21 can be removed from the workbench 11 .

[0038] S3, place the box 21 on the workbench 11. Loosen the top screw, slide the slide 211, the slide 211 drives the first connecting rod 27 to rotate through the fixing pin 214 and the transmission hole 213, the first connecting rod 27 drives the second connecting rod 28 to rotate, the second connecting rod 28 drives the second sliding sleeve 25 to slide along the guide rod 23, and drives the third connecting rod 29 to rotate, the third connecting rod 29 drives the third sliding sleeve 26 to slide, the second sliding sleeve 25 and the third sliding sleeve 26 drive the heating wire 210 to unfold, the heating wire 210 is energized, and the transparent soil in the box 21 is heated. After heating to the design temperature, slide the slide 211 in the opposite direction, tighten the top screw, and move the heating wire 210 to the bottom of the box 21.

[0039] The heating wire 210 can keep the transparent soil warm when it is under the box 21. A controller can also be provided, and a sensor can be provided in the box 21. The external power supply, the heating wire 210, and the sensor are electrically connected to the controller using existing technology, and the temperature of the transparent soil is controlled by the controller to maintain the transparent soil at a set temperature.

[0040] S4. Adjust the laser 13 and the industrial camera 14. The laser 13 forms a speckle image in the transparent soil. Start simulating tunnel construction through the shield machine simulation device. The shield machine simulation device adopts the structure in the existing patent CN202210472759.4, except that the structure of the shield model 3 is different. Fig.10 , Fig.11 As shown. A spiral flow channel 31 is arranged inside the shield model 3, and the liquid inlet 32 ​​of the shield model 3 is connected to the liquid outlet of an external refrigerator or heater through a connecting hose, and the liquid outlet 33 of the shield model 3 is connected to the liquid return end of the external refrigerator or heater through a connecting hose. When the shield machine simulation device is moving forward, the shield model 3 moves forward, and the circulating medium is introduced into the flow channel 31 through the refrigerator or heater to heat or cool the shield model 3, so as to simulate the operation process of the energy tunnel.

[0041] S5. The speckle image is collected by the industrial camera 14, and the image is processed and analyzed by the existing PIV technology to obtain the three-dimensional deformation field of the transparent soil during the energy tunnel excavation process.

[0042] Therefore, the transparent soil test device and test method for simulating energy tunnel construction described in the present invention can solve the problem that the existing transparent soil test device cannot meet the energy tunnel excavation simulation and improve the simulation accuracy.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A transparent soil test device for simulating energy tunnel construction, characterized in that: The simulation platform includes a workbench, a model box is arranged on the upper surface of the workbench, a fixing mechanism for fixing the model box is arranged on the workbench, and an optical system is arranged on the workbench; the model box includes a box body, a bottom plate is arranged at the bottom of the box body, a heating wire for heating the transparent soil in the box body is arranged on the outside of the box body along the axial direction of the simulation tunnel, and an extension mechanism for driving the heating wire to slide up and down is arranged on the bottom plate.

2. A transparent soil test device for simulating energy tunnel construction according to claim 1, characterized in that: The fixing mechanism includes a mounting seat, which is arranged on the upper surface of the workbench, and a card slot for placing the box is arranged on the upper surface of the mounting seat, and pressure blocks for pressing the box are arranged on both sides of the card slot, and a third mounting slot for installing the pressure block is arranged on the side wall of the card slot, and the middle part of the pressure block is rotatably connected to the third mounting slot through a rotating shaft, and the third mounting slot and the pressure block are provided with a torsion spring that enables one end of the pressure block close to the box to rotate upward; a rotating structure is arranged inside the mounting seat to drive the pressure block to rotate and press the box.

3. A transparent soil test device for simulating energy tunnel construction according to claim 2, characterized in that: The rotating structure includes a lifting block, and one end of the pressure block away from the box body contacts the upper surface of the lifting block under the action of a torsion spring. A second mounting groove for accommodating the lifting block is provided on the mounting seat, and the second mounting groove is connected to the third mounting groove. The lifting block moves up and down along the second mounting groove. A sliding rod is provided below the lifting block, and a sliding hole for allowing the sliding rod to pass through is provided at the bottom of the second mounting groove. A third spring is provided between the lifting block and the second mounting groove to apply a downward pulling force to the lifting block, and a lifting component is provided inside the mounting seat to drive the lifting block to rise and fall through the sliding rod.

4. A transparent soil test device for simulating energy tunnel construction according to claim 3, characterized in that: The lifting assembly includes a slide plate, a slide groove for accommodating the slide plate is arranged inside the mounting seat, the slide plate slides along the slide groove, a second inclined surface is arranged on the upper surface of the slide plate, and the bottom end of the slide rod contacts the second inclined surface under the action of the third spring; a sliding structure for driving the slide plate to slide is arranged on the mounting seat.

5. A transparent soil test device for simulating energy tunnel construction according to claim 4, characterized in that: The sliding structure includes a top plate, a first mounting groove for accommodating the top plate is arranged in the card slot, a transmission rod is arranged on the lower surface of the top plate, a limiting groove for allowing the transmission rod to pass through is arranged at the bottom of the first mounting groove, the first mounting groove is connected with the slide groove through the limiting groove, a hole for allowing the slide plate to pass through is arranged on the transmission rod, the top of the hole is an inclined surface adapted to the first inclined surface of the slide plate, the inclination directions of the first inclined surface and the second inclined surface are opposite, a first spring for applying an upward thrust to the top plate is arranged between the top plate and the first mounting groove, and a second spring for applying an outward thrust to the slide plate is arranged between the slide plate and the slide groove; a locking structure for locking the slide plate is arranged on the mounting seat.

6. A transparent soil test device for simulating energy tunnel construction according to claim 5, characterized in that: The locking structure includes a guide sleeve, which is fixedly connected to the mounting seat, the slide plate is located in the guide sleeve, a fixing sleeve is arranged on the side wall of the guide sleeve, a locking pin is slidably arranged in the fixing sleeve, a through hole is arranged on the guide sleeve for the locking pin to pass through, a locking hole is arranged on the slide plate for the locking pin to be inserted, a fixing plate is arranged on the locking pin, the fixing plate is located in the fixing sleeve, a fourth spring is arranged between the fixing plate and the guide sleeve to apply inward pulling force to the locking pin, and a handle is arranged on the end of the locking pin extending out of the fixing sleeve.

7. A transparent soil test device for simulating energy tunnel construction according to claim 6, characterized in that: The extending mechanism includes a guide rod, which is fixed on the bottom plate and located at the four corners of the box body. A first sliding sleeve, a second sliding sleeve and a third sliding sleeve are slidably arranged on the guide rod in sequence. A first connecting rod is hinged on the first sliding sleeve. The top end of the first connecting rod is hinged to the bottom end of the second connecting rod, the middle part of the second connecting rod is hinged to the second sliding sleeve, the top end of the second connecting rod is hinged to the bottom end of the third connecting rod, and the top end of the third connecting rod is hinged to the third sliding sleeve; heating wires are arranged between the two first sliding sleeves, between the two second sliding sleeves, and between the two third sliding sleeves on the same side of the box body, and the heating wires are connected to an external power supply; a power structure for driving the first connecting rod to rotate is arranged on the bottom plate.

8. The transparent soil test device for simulating energy tunnel construction according to claim 7, characterized in that: The power structure includes a slide seat, which is perpendicular to the simulated tunnel. A slide rail is provided on the bottom plate to guide the slide seat along the axial direction of the simulated tunnel. Fixed pins are provided at both ends of the slide seat. A long transmission hole is provided at the bottom end of the first connecting rod for the fixed pin to pass through. The fixed pin is slidably connected to the transmission hole. A top screw is provided on the slide seat to lock the slide seat and the slide rail.

9. A transparent soil test device for simulating energy tunnel construction according to claim 8, characterized in that: The optical system includes a laser, which is located directly above the box. The laser is arranged on a support frame, and the support frame is fixed on a workbench. An industrial camera is arranged on the workbench. The industrial camera is arranged along the axial and radial directions of the simulated tunnel, and the industrial camera is arranged perpendicular to the laser.

10. A test method based on a transparent soil test device for simulating energy tunnel construction according to claim 9, characterized in that: The steps include: S1. Clean and dry the box, and add the prepared transparent soil inside the box to the designed height; S2. Put the bottom plate of the box into the slot, press the top plate downward through the box, the top plate drives the slide plate to slide along the slide slot through the transmission rod and the first inclined surface, the first spring and the second spring are compressed; the slide plate drives the slide bar to slide upward through the second inclined surface, the slide bar drives the lifting block to slide upward, the lifting block drives the pressing block to rotate, and the third spring is extended; when the slide plate slides, the locking pin is inserted into the locking hole of the slide plate under the action of the fourth spring, the slide plate is locked, the pressing block presses the bottom plate, and the box is fixed; S3, place the box on the workbench, loosen the top screw, slide the slide, the slide drives the first connecting rod to rotate through the fixed pin and the transmission hole, the first connecting rod drives the second connecting rod to rotate, the second connecting rod drives the second sliding sleeve to slide along the guide rod, and drives the third connecting rod to rotate, the third connecting rod drives the third sliding sleeve to slide, the second sliding sleeve and the third sliding sleeve drive the heating wire to unfold, the heating wire is energized, and the transparent soil in the box is heated; after the heating is completed, slide the slide in the opposite direction, tighten the top screw, and move the heating wire to the bottom of the box; S4. Adjust the laser and the industrial camera, and the laser forms a speckle image in the transparent soil; start simulating tunnel construction through the shield machine simulation device, the liquid inlet of the shield model in the shield machine simulation device is connected to the liquid outlet of the external refrigerator or heater through a connecting pipe, and the liquid outlet of the shield model is connected to the liquid return end of the external refrigerator or heater through a connecting pipe. During the forward excavation process of the shield machine simulation device, the shield model moves forward, and a circulating medium is introduced into the flow channel through the refrigerator or heater to heat or cool the shield model; S5. The speckle image is collected by an industrial camera, and the image is processed and analyzed by PIV technology.

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