A combined rock - like mass double - hole specimen forming device and specimen forming method

Abstract

The present invention discloses a combined rock - like mass double - hole specimen forming device and a specimen forming method, which relates to the field of combined rock - like mass double - hole specimen forming molds, and includes a bottom plate and a rectangular ring frame. The rectangular ring frame is detachably connected to the upper end surface of the bottom plate; two vertical position adjusting components are detachably connected to two opposite side surfaces of the bottom plate. Positioning brackets are connected to the vertical position adjusting components, horizontal position adjusting components are connected to the positioning brackets, and tunnel model bodies are connected to the horizontal position adjusting components; the vertical position adjusting components enable the positioning brackets and the tunnel model bodies to move in the vertical direction; the horizontal position adjusting components enable the tunnel model bodies to move in the horizontal direction. The present invention improves the integration degree and the repeated utilization rate of the rock - like mass double - hole specimen forming device.

Description

Technical Field

[0001] The present invention relates to the field of combined rock - like mass double - hole specimen forming molds, and particularly relates to a combined rock - like mass double - hole specimen forming device and a specimen forming method. Background Art

[0002] With the increasing demand for energy resources in the development of human society, the development and utilization of tunnels, underground projects, and underground spaces have been increasingly emphasized by countries around the world.

[0003] With the continuous deepening of underground space development work, in order to meet the application requirements of underground chambers in the fields of transportation, hydropower generation, energy storage, and deep - earth research, there are currently more and more underground chamber projects with complex double - hole parallel structures. Double - hole parallel underground chambers have the advantages of simple construction technology, little influence from the overall linear planning, flexible setting, and easy control of construction costs. Therefore, they are widely used in actual construction. However, compared with single - hole tunnels, the interaction between double - hole tunnels is significant, the structural forces are complex and changeable, and the intermediate rock stratum between the tunnels is extremely vulnerable to disturbance and damage, posing great challenges to the safe construction and operation of parallel double - hole tunnels.

[0004] Rock mass is a geological body with discontinuity, heterogeneity, and anisotropy. When constructing and operating double - hole parallel underground chambers in rock mass, the influence of the rock - mass structure itself on the tunnel stability cannot be ignored, and the stress form of the chamber itself is mainly determined by the tectonic characteristics of the rock mass. The brittleness and heterogeneity of the rock - mass structure will lead to differences in the mechanical properties of the surrounding rock of double - hole tunnels under different shapes and layout methods, thus resulting in the complexity of the failure mode and instability mechanism of the rock - mass surrounding rock.

[0005] Therefore, it has important theoretical and practical significance to simulate and study the instability failure mode of double - hole tunnels in rock - like mass surrounding rock through indoor scaled - down specimen similarity tests.

[0006] However, the existing integrated degree and repeated utilization rate of the rock - like mass double - hole specimen forming mold device are relatively low. One set of molds can only be used to fabricate specimens for one type of double - hole tunnel working condition. At the same time, the specimen production process lacks a refined control process, making it difficult to control non - relevant variables during the specimen production process, thus affecting the test results.

[0007] The present invention discloses a combined rock - like mass double - hole specimen forming mold device and a usage method, which can achieve the efficient and refined production of rock - like mass double - hole specimens with any combined shape, thus contributing to the in - depth study of the instability mode and failure mechanism of underground rock - mass parallel chambers under complex conditions. Summary of the Invention

[0008] An object of the present invention is to provide a combined rock - like mass double - tunnel specimen forming device and a specimen forming method. Through the present invention, the integration, adaptability, forming accuracy and reuse rate of the specimen forming device are improved.

[0009] This object is achieved by the following technical solutions:

[0010] A combined rock - like mass double - tunnel specimen forming device and a specimen forming method, including a bottom plate and a rectangular ring frame. The rectangular ring frame is detachably connected to the upper end surface of the bottom plate; two vertical position adjusting components are detachably connected to two opposite side surfaces of the bottom plate. A positioning bracket is connected to each vertical position adjusting component, and a horizontal position adjusting component is connected to each positioning bracket. A tunnel model body is connected to the horizontal position adjusting component. Preferably, the rectangular ring frame includes four forming side plates that are detachably connected in sequence at the head and tail.

[0011] The vertical position adjusting component moves the positioning bracket and the tunnel model body in the vertical direction; the horizontal position adjusting component moves the tunnel model body in the horizontal direction.

[0012] A first telescopic component is arranged between the horizontal position adjusting component and the tunnel model body, and the first telescopic component is used to adjust the distance between the tunnel model body and the bottom plate.

[0013] During use, connect the rectangular ring frame to the bottom plate; connect the two vertical position adjusting components to two opposite side surfaces of the bottom plate respectively; connect the two positioning brackets to the two vertical position adjusting components respectively;

[0014] According to the position information of the double - tunnel, adjust the vertical position adjusting component to move the positioning bracket and the tunnel model body in the vertical direction; the horizontal position adjusting component moves the tunnel model body in the horizontal direction; evenly apply vaseline on the inner side of the rectangular ring frame and the upper end surface of the bottom plate; evenly apply vaseline on the outer surfaces of the two tunnel model bodies;

[0015] Adjust the first telescopic component arranged between the horizontal position adjusting component and the tunnel model body, and the first telescopic component makes the lower end of the tunnel model body contact the upper end of the bottom plate;

[0016] Pour the preset double - tunnel material on the bottom plate. When the preset double - tunnel material covers the upper end surface of the rectangular ring frame, tap the side surface of the bottom plate to make the preset double - tunnel material wrap the tunnel model body, and cover the first layer of plastic wrap on the bottom plate for sealed curing;

[0017] After the first preset time, the preset double - tunnel material is initially coagulated. Adjust the first telescopic component to move the two tunnel model bodies upward. After the two tunnel model bodies are taken out, cover the second layer of plastic wrap on the bottom plate to seal the double - tunnel openings formed after the two tunnel model bodies are taken out;

[0018] After the second preset time, the preset double-hole tunnel material condenses to obtain a formed specimen on the bottom plate; the rectangular ring frame is removed from the bottom plate;

[0019] Tap the side of the bottom plate to separate the formed specimen from the bottom plate.

[0020] Compared with the existing forming device, this device can conveniently and quickly disassemble and assemble the double-hole specimen forming device, and the operation is convenient and it can be reused. Moreover, this device can be applied to the production of different specimens. When operating, it can adjust the positions of the two tunnel model bodies on the bottom plate through the vertical position and horizontal position adjusting components, so as to be applicable to the production of formed specimens of double-hole tunnels with different positional relationships, and the scope of use is wider.

[0021] Specifically, the vertical position adjusting component can have various structures. The inventor of the present invention preferably selects a structure of the vertical position adjusting component. The vertical position adjusting component includes two scale chutes, and the two scale chutes are respectively detachably connected to two opposite sides of the bottom plate; the scale chute includes a chute scale and a slide rail groove, and the positioning bracket is detachably connected in the slide rail groove, and the positioning bracket can slide along the direction where the slide rail groove is located.

[0022] The positioning bracket includes a convex base, a hollow cylindrical support and a cylindrical lifting bracket. The lower end of the cylindrical lifting bracket is sleeved in the hollow cylindrical support, the lower end of the hollow cylindrical support is connected to the convex base, and the cylindrical lifting bracket can rotate circumferentially in the hollow cylindrical support; the horizontal position connector is connected to the upper end of the cylindrical lifting bracket.

[0023] The convex base is connected in the slide rail groove, and the convex base slides in the slide rail groove. The straight line where the slide rail groove is located is a vertical straight line. When the convex base slides along the slide rail groove, the positioning bracket and the tunnel model body move along the vertical direction.

[0024] Preferably, a vertical line is provided on the cylindrical lifting bracket, and a vertical pointer is provided on the hollow cylindrical support. When the hollow cylindrical support rotates on the cylindrical lifting bracket, when the vertical line is aligned with the vertical pointer, the horizontal position control rod is located on a horizontal straight line.

[0025] Specifically, the horizontal position adjusting component includes a horizontal position connector and a horizontal position fixer. The horizontal position connector is connected to the positioning bracket. The horizontal position fixer is provided with a through hole, and a horizontal position control rod is connected in the through hole. The tunnel model body is detachably connected to the horizontal position control rod, and a control rod scale is provided on the horizontal position control rod.

[0026] Specifically, the first telescopic component includes a vertical rack and a fixator. A lifting fixator is threadedly connected to the vertical rack. The lower end of the vertical rack is connected to the inner ring of the roller bearing of the fixator. The lower end of the fixator is detachably connected to the tunnel model body. The tunnel model body is moved up and down by rotating the vertical rack. Preferably, a horizontal spirit level is provided on the lifting fixator.

[0027] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0028] A combined rock - like double - hole specimen forming device and a specimen forming method of the present invention improve the integration and reuse rate of the rock - like double - hole specimen forming device. The assembly and disassembly process of this device is convenient, the fitting degree between components is high, and the device has good controllability. Therefore, it is more convenient to achieve the refined control of this device during the specimen production process. At the same time, the specimen production adaptability of this device is strong, and it can complete the production of specimens for double - hole tunnel conditions of various structural types and various positional relationships, further improving the reuse efficiency of this device and the production efficiency of test specimens, and reducing the test period.

[0029] This device can achieve the refined production of specimens with various configurations and various position combinations of the double - hole tunnel model. According to the engineering test background and test purpose, the planar shape and relative position relationship of the tunnel model body can be adjusted quickly in real - time, and the precise positioning of the tunnel model body can be achieved through the chute scale and the horizontal position control rod. It can effectively reduce the influence of other non - relevant variable factors on the test results during the specimen production process, further improving the reliability of the test results, and contributing to the in - depth study of the instability mode and failure mechanism of parallel underground rock chambers under complex conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0031] Figure 1 It is a schematic structural diagram when the bottom plate and the rectangular ring frame are connected;

[0032] Figure 2 It is a schematic structural diagram of the bottom plate;

[0033] Figure 3 It is a schematic structural diagram of the forming side plate;

[0034] Figure 4 It is a schematic structural diagram of the scale chute;

[0035] Figure 5 It is a schematic structural diagram of the positioning bracket;

[0036] Figure 6 It is a schematic structural diagram of the horizontal position fixator;

[0037] Figure 7 is a schematic structural diagram of the first telescopic component;

[0038] Figure 8 is a schematic structural diagram of the tunnel model body;

[0039] Figure 9 is a schematic structural diagram of the assembled device.

[0040] Marks in the attached drawings and corresponding component names:

[0041] 1 - scale chute, 2 - tunnel model body, 3 - bottom plate, 4 - forming side plate, 5 - opening slot, 6 - slide rail groove, 7 - chute scale, 8 - chute connection hole, 9 - horizontal position control rod, 10 - convex base, 11 - hollow cylindrical support, 12 - cylindrical lifting bracket, 13 - horizontal position connector, 14 - horizontal position fixer, 15 - chute scale pointer, 16 - vertical pointer, 17 - lifting bracket control bolt, 18 - vertical line, 19 - fixer control bolt, 20 - fixer screw, 21 - through hole, 22 - horizontal rod fixing bolt, 23 - hand crank, 24 - stainless steel disc, 25 - vertical rack, 26 - lifting fixer, 27 - roller bearing, 28 - fixer, 29 - lifting fixing bolt hole, 30 - horizontal spirit level. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with embodiments and the attached drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. are based on the orientation or positional relationships shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the present invention.

[0044] Embodiment 1

[0045] As Figure 1 shown, this structure includes a bottom plate 3 and a rectangular ring frame. The structure of the bottom plate 3 is as Figure 2 shown. The bottom plate 3 is a stainless steel groove box, welded by stainless steel plates. The length and width of the bottom plate 3 are both 260 mm, and the height of the bottom plate 3 is 30 mm. Threaded openings are reserved on the upper surface steel plate and the side steel plate of the bottom plate 3.

[0046] The rectangular ring frame includes four formed side plates 4 that are detachably connected in sequence at their first and last ends. The formed side plate 4 is as follows Figure 3 As shown, the formed side plate 4 is a trapezoidal hollow steel column. The formed side plate 4 is welded by stainless steel bars. Its total length is 230 mm, height is 30 mm, width is 30 mm. The length inside the rectangular ring frame is 200 mm, width is 200 mm, and height is 30 mm. Two opening slots 5 are provided on the formed side plate 4. The opening slots 5 on the four formed side plates 4 are bolted to the threaded openings on the upper surface steel plate of the bottom plate 3.

[0047] Two vertical position adjustment components are detachably connected to two opposite sides of the bottom plate 3. Positioning brackets are connected to the vertical position adjustment components. Horizontal position adjustment components are connected to the positioning brackets. A tunnel model body 2 is connected to the horizontal position adjustment components; the vertical position adjustment components move the positioning brackets and the tunnel model body 2 in the vertical direction; the horizontal position adjustment components move the tunnel model body 2 in the horizontal direction.

[0048] During use, connect the rectangular ring frame to the bottom plate 3; connect the two vertical position adjustment components to two opposite sides of the bottom plate 3 respectively; connect the two positioning brackets to the two vertical position adjustment components respectively;

[0049] According to the position information of the double - hole tunnel, adjust the vertical position adjustment components to move the positioning brackets and the tunnel model body 2 in the vertical direction; the horizontal position adjustment components move the tunnel model body 2 in the horizontal direction.

[0050] In some embodiments, the two vertical position adjustment components are two telescopic rods. The telescopic movement of the telescopic rods drives the positioning brackets and the tunnel model body 2 to move in the vertical direction; the horizontal position adjustment component is also a telescopic rod. The telescopic movement of the telescopic rod makes the tunnel model body 2 move in the horizontal direction.

[0051] In this embodiment, on the upper end surface of the bottom plate 3, the direction of the length of the upper end surface of the bottom plate 3 is the horizontal direction, and the direction of the width of the upper end surface of the bottom plate 3 is the vertical direction.

[0052] Embodiment 2

[0053] Based on the above - mentioned embodiment, the vertical position adjustment component includes two scale chutes 1. The two scale chutes 1 are respectively detachably connected to two opposite sides of the bottom plate 3; the scale chute 1 is as follows Figure 4As shown in the figure, the scale chute 1 includes a chute scale 7 and a slide rail groove 6. The total height of the scale chute 1 is 60 mm, and the total width is 40 mm. A slide rail groove 6 is arranged along the length direction of the scale chute 1, and the total length of the slide rail groove 6 is 200 mm. The upper surface of the scale chute 1 is provided with a chute scale 7. Chute connection holes 8 are respectively arranged at both ends of the scale chute 1 in the length direction. When the scale chute 1 is connected to the bottom plate 3, bolts are connected to the threaded openings on the side steel plates of the chute connection holes 8 and the bottom plate 3.

[0054] The positioning bracket is detachably connected in the slide rail groove 6, and the positioning bracket can slide along the direction where the slide rail groove 6 is located. The length direction of the scale chute 1 is the vertical direction.

[0055] Embodiment 3

[0056] Based on the above embodiments, the positioning bracket is as Figure 5 shown. The positioning bracket includes a convex base 10, a hollow cylindrical support 11, and a cylindrical lifting bracket 12. The lower end of the cylindrical lifting bracket 12 is sleeved in the hollow cylindrical support 11, the lower end of the hollow cylindrical support 11 is connected to the convex base 10, and the cylindrical lifting bracket 12 can rotate circumferentially within the hollow cylindrical support 11; a horizontal position connector 13 is connected to the upper end of the cylindrical lifting bracket 12.

[0057] The convex base 10 can be embedded in the slide rail groove 6 for sliding, so as to drive the positioning bracket to move integrally in the plane along the slide rail groove 6. The hollow cylindrical support 11 is located above the convex base 10 and is rigidly connected to the convex base 10. The height of the hollow cylindrical support 11 is 100 mm, and the diameter is 20 mm. A chute scale pointer 15 is engraved at the bottom of the hollow cylindrical support 11, and the specific position of the positioning bracket is determined by corresponding to the scale value on the chute scale 7.

[0058] A vertical pointer 16 is engraved on the upper part of the hollow cylindrical support 11. The total length of the cylindrical lifting bracket 12 is 200 mm, and the diameter is slightly smaller than that of the hollow cylindrical support 11. The cylindrical lifting bracket 12 is nested inside the hollow cylindrical support 11 and can rotate and lift freely. The cylindrical lifting bracket 12 can be fixed by screwing the lifting bracket control bolt 17 arranged on the upper part of the hollow cylindrical support 11 clockwise, and the cylindrical lifting bracket 12 can move up and down and rotate by unscrewing the lifting bracket control bolt 17 counterclockwise. Vertical lines 18 are engraved on the outer surface of the cylindrical lifting bracket 12 in the length direction.

[0059] A first telescopic assembly is arranged between the horizontal position adjusting assembly and the tunnel model body 2, and the first telescopic assembly is used to adjust the distance between the tunnel model body 2 and the bottom plate 3.

[0060] In some embodiments, the horizontal position adjustment assembly includes a horizontal position connector 13 and a horizontal position fixer 14. The horizontal position connector 13 is connected to the positioning bracket, and the structure of the horizontal position fixer 14 is as shown in Figure 6 shown. A through hole 21 is provided on the horizontal position fixer 14, and a horizontal position control rod 9 is connected in the through hole 21. A fixer screw 20 is provided on the horizontal position fixer 14, and the fixer screw 20 and the horizontal position connector 13 are detachably connected by a fixer control bolt 19; the axis of the through hole 21 is perpendicular to the axis of the fixer screw 20. The inner wall of the through hole 21 is smooth with a diameter of 10 mm, and a horizontal rod fixing bolt 22 is provided at the top of the horizontal position fixer 14.

[0061] The tunnel model body 2 is detachably connected to the horizontal position control rod 9, and a control rod scale is provided on the horizontal position control rod 9.

[0062] Among them, the horizontal position connector 13 is fixed to the upper part of the cylindrical lifting bracket 12 and is connected to the horizontal position fixer 14 through the fixer control bolt 19. By tightening the fixer control bolt 19 clockwise, the horizontal position fixer 14 can be fixedly connected, and by loosening the fixer control bolt 19 counterclockwise, the horizontal position fixer 14 can freely rotate around the fixer screw 20.

[0063] The length of the horizontal position control rod 9 is 110 mm, and the diameter is 9 mm. The horizontal position control rod 9 is marked with scales, and one end of the horizontal position control rod 9 is engraved with a thread with a length of 10 mm. The horizontal position control rod 9 passes through the through hole 21 and is placed inside the horizontal position fixer 14, and the horizontal position control rod 9 can be fixed by tightening the horizontal rod fixing bolt 22.

[0064] During use, the convex base 10 is embedded in the slide rail groove 6, slides in the slide rail groove 6 through the convex base 10, and the position of the tunnel model body 2 in the vertical direction is obtained by the slide groove scale pointer 15 pointing to the slide groove scale 7.

[0065] Rotate the lifting bracket control bolt 17 to adjust the height of the upper end of the cylindrical lifting bracket 12, and rotate the cylindrical lifting bracket 12 to align the vertical line 18 with the vertical pointer 16 to ensure that the horizontal position control rod 9 is in the horizontal direction.

[0066] Adjust the position of the horizontal position control rod 9 inside the horizontal position fixer 14 to make the tunnel model body 2 slide in the horizontal direction, thereby adjusting the position of the tunnel model body 2 in the horizontal direction.

[0067] Embodiment 4

[0068] On the basis of the above embodiments, a first telescopic component is provided between the horizontal position adjusting component and the tunnel model body 2, and the first telescopic component is used to adjust the distance between the tunnel model body 2 and the bottom plate 3.

[0069] In some embodiments, the first telescopic component is a telescopic rod, and the telescopic movement of the telescopic rod drives the tunnel model body 2 to move, so as to adjust the distance between the tunnel model body 2 and the bottom plate 3.

[0070] In some embodiments, as Figure 7 shown, the first telescopic component includes a hand crank 23, a stainless steel disc 24, a vertical rack 25, a lifting fixator 26, a roller bearing 27 and a fixator 28.

[0071] The hand crank 23 is fixed on the outer edge of the upper surface of the stainless steel disc 24, and its length is 60 mm. The diameter of the stainless steel disc 24 is 50 mm, and the center of its lower surface is fixedly connected to the upper end of the vertical rack 25. The diameter of the vertical rack 25 is 10 mm, and the total length is 300 mm.

[0072] A vertically penetrating threaded hole is provided in the middle position of the lifting fixator 26. The vertical rack 25 passes through the threaded hole and meshes with the lifting fixator 26. A lifting fixing bolt hole 29 is reserved on one side of the lifting fixator 26. By screwing the threaded end of the horizontal position control rod 9 into the lifting fixing bolt hole 29, the horizontal position control rod 9 is connected to the lifting fixator 26. A horizontal bubble level 30 is provided on the lifting fixator 26.

[0073] The lower end of the vertical rack 25 is connected to the inner ring of the roller bearing 27 of the fixator 28. The outer circle of the roller bearing 27 is connected to the fixator 28, and the lower end of the fixator 28 is detachably connected to the tunnel model body 2.

[0074] The fixator 28 is a stainless steel ring, with an outer diameter of 25 mm, a thickness of 5 mm, and a threaded hole with a diameter of 10 mm reserved in the center.

[0075] When the hand crank 23 and the stainless steel disc 24 rotate, they drive the vertical rack 25 to rotate and move up and down along the lifting fixator 26. Since the lower end of the vertical rack 25 is fixed on the inner wall of the inner circle of the roller bearing 27, and the outer circle of the roller bearing 27 is connected to the fixator 28, when the vertical rack 25 rotates, the fixator 28 will not rotate with the vertical rack 25, but only move up and down with the vertical rack 25.

[0076] In some embodiments, the tunnel model body 2 is as Figure 8 shown. The tunnel model body 2 is a solid stainless steel component with a height of 30 mm. The planar shape of the tunnel model body 2 can be processed into different shapes such as circular, oval and horseshoe according to the background and purpose of the underground chamber test research.

[0077] At the upper part of the tunnel model body 2, there is a tunnel model fixing screw 31 with a diameter of 10 mm and a length of 15 mm. By screwing the tunnel model fixing screw 31 into the threaded hole in the center of the fixer 28, the fixer 28 is fixed on the fixer 28.

[0078] This device can achieve the efficient and refined production of dual-tunnel specimens of rock masses with arbitrary combined shapes. This device has the characteristics of high integration and high reuse rate, can be used to produce dual-tunnel specimens of rock masses for various configurations and various position combinations, and can also achieve refined control during the specimen production process.

[0079] Example 5

[0080] Based on the above embodiments, a method for forming a combined rock mass dual-tunnel specimen includes the following steps:

[0081] Step 1, determine the planar shape of the tunnel model body 2 based on the background of the dual-tunnel project and the test purpose. At the same time, determine the planar dimensions of the two tunnel model bodies 2 and the relative position relationship between the two tunnels according to the similarity ratio of the model specimens. Finally, prepare two tunnel model bodies 2 in advance for standby according to the planar dimensions of the tunnel model body 2. At the same time, pre-determine and record the scale values corresponding to the chute scale 7 and the horizontal position control rod 9 according to the relative position relationship between the two tunnels, so as to prepare for the accurate positioning of the two tunnel model bodies 2 in the follow-up;

[0082] Step 2, place the bottom plate 3 with the plane facing up and the groove facing down. Connect the four forming side plates 4 end to end and connect them with bolts to form a rectangular ring frame. Fix the rectangular ring frame on the plane of the bottom plate 3 through bolts to form a specimen forming platform; a space for pouring similar materials of a dual-tunnel rock mass with a side length of 200 mm and a thickness of 30 mm is formed inside the rectangular ring frame on the specimen forming platform.

[0083] Step 3, place the two scale chutes 1 on both sides of the bottom plate 3 respectively, and fix the two scale chutes 1 on both sides of the bottom plate 3 through the chute connection holes 8 with bolts, so that the two scale chutes 1 are fixedly connected to the bottom plate 3.

[0084] Step 4, embed the convex bases 10 of the two sets of positioning brackets into the slide rail grooves 6 of the two scale chutes 1 respectively to complete the installation of the two sets of positioning brackets;

[0085] Step 5, loosen the horizontal rod fixing bolt 22 counterclockwise so that the horizontal position control rod 9 can rotate freely in the through hole 21. Screw the threaded end of the horizontal position control rod 9 into the lifting fixing bolt hole 29 on the lifting fixer 26, and then tighten the horizontal rod fixing bolt 22 clockwise to fix the horizontal position control rod 9;

[0086] Step 6: Install the two pre-prepared tunnel model bodies 2 on the fixator 28 respectively. When installing, screw the tunnel model fixing screw 31 into the threaded hole in the center of the fixator 28 and tighten it fully.

[0087] Step 7: Determine the relative position relationship between the two tunnels according to the test plan and accurately position the two tunnel model bodies 2.

[0088] First, move the convex bases 10 of the two positioning brackets along the slide rail grooves 6 respectively, so that the pointer 15 of the slide scale on the hollow cylindrical support 11 aligns with the pre-determined position on the slide scale 7.

[0089] Loosen the lifting bracket control bolt 17 counterclockwise so that the cylindrical lifting bracket 12 can be lifted and rotated. Raise the cylindrical lifting bracket 12 to the maximum height and slowly rotate it. After aligning the vertical pointer 16 on the hollow cylindrical support 11 with the vertical line 18 on the cylindrical lifting bracket 12, tighten the lifting bracket control bolt 17 to ensure that the horizontal position control rod 9 is perpendicular to the length direction of the scale chute 1.

[0090] Loosen the fixator control bolt 19 counterclockwise so that the horizontal position fixator 14 can rotate around the fixator screw 20. At the same time, observe the bubble in the horizontal bubble level 30. When the bubble is centered, quickly tighten the fixator control bolt 19 clockwise to ensure that the horizontal position control rod 9 remains horizontal. Finally, loosen the horizontal rod fixing bolt 22 counterclockwise to move the horizontal position control rod 9 horizontally. After observing that the scale on the horizontal position control rod 9 reaches the pre-determined position, tighten the horizontal rod fixing bolt 22 clockwise to fix the horizontal position control rod 9, thus completing the positioning of the tunnel model body 2. In this step, the positioning processes of the two tunnel model bodies 2 are the same. After adjustment, the device is as Figure 9 shown;

[0091] Step 8: Apply vaseline evenly on the inner side of the rectangular ring frame and the upper end surface of the bottom plate 3; apply vaseline evenly on the outer surfaces of the two tunnel model bodies 2 to facilitate the smooth demoulding of the double-tunnel specimen. Then, rotate the hand crank 23 and the stainless steel disc 24 clockwise to make the lower surface of the tunnel model body 2 contact with the upper end surface of the bottom plate 3.

[0092] Step 9: Pour the preset double-hole tunnel material onto the bottom plate 3. When the preset double-hole tunnel material covers the upper end surface of the rectangular ring frame, that is, the top surface of the double-hole tunnel-like rock mass similarity material casting platform space, stop pouring. Tap the side surface of the bottom plate 3 with a rubber hammer to reduce the casting pores, so that the preset double-hole tunnel material can fill the entire similarity material casting platform space and ensure that the preset double-hole tunnel material can fully wrap the two tunnel model bodies 2. Cover the first layer of plastic wrap on the bottom plate 3, that is, on the similarity material casting platform space, for sealed curing; wherein, the preset double-hole tunnel material is a uniformly mixed double-hole tunnel-like rock mass similarity material

[0093] Step 10: After the first preset time, the preset double-hole tunnel material is initially coagulated. Rotate the hand crank 23 and the stainless steel disc 24 counterclockwise to slowly lift the two tunnel model bodies 2 upward. When the two tunnel model bodies 2 are taken out, cover the second layer of plastic wrap on the bottom plate 3 to seal the double-hole openings formed after the two tunnel model bodies 2 are taken out; The first preset time is 40 - 50 minutes, preferably 45 minutes;

[0094] After the second preset time, the preset double-hole tunnel material coagulates to obtain the formed specimen on the bottom plate 3; Remove the rectangular ring frame from the bottom plate 3; The second preset time is 5 - 7 h, preferably, the second preset time is 6 h;

[0095] Tap the side surface of the bottom plate 3 to separate the formed specimen from the bottom plate 3.

[0096] The "first", "second", "third", etc. used in this article are only used to distinguish the corresponding components for the sake of clear description, and are not intended to limit any order or emphasize importance, etc. In addition, the term "connection" used in this article, without special explanation, can be directly connected or indirectly connected through other components.

[0097] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above is only the specific embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A specimen forming method based on a combined rock-like double-hole specimen forming device, characterized in that: The forming device comprises a bottom plate (3) and a rectangular ring frame, wherein the rectangular ring frame is detachably connected to the upper end surface of the bottom plate (3); Two vertical position adjustment components are detachably connected to two opposite side surfaces of the bottom plate (3), each of the vertical position adjustment components is connected to a positioning bracket, each of the positioning brackets is connected to a horizontal position adjustment component, and the horizontal position adjustment component is connected to a tunnel model body (2); the vertical position adjustment components enable the positioning brackets and the tunnel model body (2) to move in a vertical direction; and the horizontal position adjustment components enable the tunnel model body (2) to move in a horizontal direction; The test piece forming method comprises the following steps: Connect the rectangular ring frame to the base plate (3); Connecting two vertical position adjustment components to two opposite sides of the base plate (3) respectively; Connect the two positioning brackets to the two vertical position adjustment components respectively; According to the position information of the double-hole tunnel, the vertical position adjustment component is adjusted to make the positioning bracket and the tunnel model body (2) move in the vertical direction; the horizontal position adjustment component makes the tunnel model body (2) move in the horizontal direction; Evenly apply vaseline on the inner side of the rectangular ring frame and the upper end surface of the bottom plate (3); Evenly apply vaseline on the outer surfaces of the two tunnel model bodies (2); Adjusting a first telescopic component disposed between the horizontal position adjustment component and the tunnel model body (2), the first telescopic component causing the lower end of the tunnel model body (2) to contact the upper end of the bottom plate (3); Pouring the preset double-hole tunnel material on the bottom plate (3); when the preset double-hole tunnel material covers the upper end surface of the rectangular ring frame, knocking the side of the bottom plate (3) so that the preset double-hole tunnel material wraps the tunnel model body (2); and covering the bottom plate (3) with a first layer of plastic wrap for sealing and curing; After the first preset time, the preset double-hole tunnel material is initially solidified, and the first telescopic component is adjusted to move the two tunnel model bodies (2) upward. When the two tunnel model bodies (2) are taken out, a second layer of plastic wrap is covered on the bottom plate (3) to seal the double-hole openings formed after the two tunnel model bodies (2) are taken out; After the second preset time, the preset double-hole tunnel material solidifies to obtain a molded test piece on the bottom plate (3); the rectangular ring frame is removed from the bottom plate (3); The side surface of the bottom plate (3) is knocked to separate the molded test piece from the bottom plate (3).

2. A specimen forming method based on a combined rock-like double-hole specimen forming device according to claim 1, characterized in that: A first telescopic component is provided between the horizontal position adjustment component and the tunnel model body (2), and the first telescopic component is used to adjust the distance between the tunnel model body (2) and the bottom plate (3).

3. A specimen forming method based on a combined rock-like double-hole specimen forming device according to claim 1, characterized in that: The vertical position adjustment component comprises two scale slide grooves (1), and the two scale slide grooves (1) are detachably connected to two opposite side surfaces of the base plate (3); the scale slide groove (1) comprises a slide groove scale (7) and a slide rail groove (6), and the positioning bracket is detachably connected in the slide rail groove (6), and the positioning bracket can slide along the direction of the slide rail groove (6).

4. A specimen forming method based on a combined rock-like double-hole specimen forming device according to claim 1, characterized in that: The horizontal position adjustment assembly comprises a horizontal position connector (13) and a horizontal position fixer (14); the horizontal position connector (13) is connected to the positioning bracket; the horizontal position fixer (14) is provided with a through hole (21), and a horizontal position control rod (9) is connected in the through hole (21); the tunnel model body (2) is detachably connected to the horizontal position control rod (9), and a control rod scale is provided on the horizontal position control rod (9).

5. The specimen forming method based on the combined rock-like double-hole specimen forming device according to claim 2 is characterized in that: The first telescopic assembly comprises a vertical rack (25) and a fixture (28); the vertical rack (25) is threadedly connected to a lifting fixture (26); the lower end of the vertical rack (25) is connected to the inner ring of a roller bearing (27) of the fixture (28); the lower end of the fixture (28) is detachably connected to the tunnel model body (2); and the tunnel model body (2) is moved up and down by rotating the vertical rack (25).

6. A specimen forming method based on a combined rock-like double-hole specimen forming device according to claim 5, characterized in that: A horizontal bubble meter (30) is provided on the lifting fixture (26).

7. A specimen forming method based on a combined rock-like double-hole specimen forming device according to claim 4, characterized in that: The positioning bracket comprises a convex base (10), a hollow cylindrical support (11) and a cylindrical lifting bracket (12); the lower end of the cylindrical lifting bracket (12) is sleeved in the hollow cylindrical support (11), the lower end of the hollow cylindrical support (11) is connected to the convex base (10), and the cylindrical lifting bracket (12) can rotate circumferentially in the hollow cylindrical support (11); and a horizontal position connector (13) is connected to the upper end of the cylindrical lifting bracket (12).

8. A specimen forming method based on a combined rock-like double-hole specimen forming device according to claim 7, characterized in that: A vertical line (18) is provided on the cylindrical lifting bracket (12), and a vertical pointer (16) is provided on the hollow cylindrical support (11). When the vertical line (18) is aligned with the vertical pointer (16), the horizontal position control rod (9) is located on a horizontal straight line.

9. The method for forming a specimen based on a combined rock-like double-hole specimen forming device according to claim 1, characterized in that: The rectangular ring frame comprises four shaped side panels (4) which are detachably connected in sequence.

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