Combined type rock-like double-hole test piece forming device and test piece forming method

Abstract

The invention discloses a combined type rock mass double-hole test piece forming device and a test piece forming method.The combined type rock mass double-hole test piece forming device comprises a bottom plate and a rectangular ring frame, and the rectangular ring frame is detachably connected to the upper end face of the bottom plate; two vertical position adjusting assemblies are detachably connected to the two opposite side faces of the bottom plate, positioning supports are connected to the vertical position adjusting assemblies, horizontal position adjusting assemblies are connected to the positioning supports, and tunnel model bodies are connected to the horizontal position adjusting assemblies; the vertical position adjusting assembly enables the positioning support and the tunnel model body to move in the vertical direction. The horizontal position adjusting assembly enables the tunnel model body to move in the horizontal direction. The integration level and the repeated utilization rate of the rock-like mass double-hole test piece forming device are improved.

Description

Technical Field

[0001] The invention relates to the field of combined rock-like double-hole specimen forming dies, and in particular to a combined rock-like double-hole specimen forming device and a specimen forming method. Background Art

[0002] With the development of human society and the increasing demand for energy resources, the development and utilization of tunnels, underground projects and underground spaces are receiving increasing attention from countries around the world.

[0003] With the continuous deepening of underground space development, in order to meet the application needs of underground caverns in transportation, hydropower generation, energy storage and deep earth research, more and more complex double-hole parallel underground cavern projects have emerged. Double-hole parallel underground caverns have the advantages of simple construction technology, little influence from overall linear planning, flexible setting, and easy cost control, so they are widely used in actual construction. However, compared with single-hole tunnels, double-hole tunnels have significant mutual influence between caverns, complex and changeable structural forces, and the rock layers between tunnels are easily disturbed and damaged, which brings great challenges to the safe construction and operation of parallel double-hole tunnels.

[0004] The rock mass is a geological body with discontinuity, heterogeneity and anisotropy. When constructing and operating a double-hole parallel underground cavern in the rock mass, the influence of the rock mass structure itself on the stability of the tunnel cannot be ignored. The stress form of the cavern itself is also mainly determined by the structural 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 under different shapes and layouts of the double-hole tunnel, thus causing the complexity of the failure mode and instability mechanism of the rock mass surrounding rock.

[0005] Therefore, it is of great theoretical and practical significance to simulate and study the instability failure mode of a twin-hole tunnel in rock-like surrounding rock through indoor scaled specimen similarity tests.

[0006] However, the existing rock-like double-hole specimen forming mold device has low integration and reuse rate. One set of molds can only be used to produce one type of double-hole tunnel working condition specimen. At the same time, the specimen lacks a refined control process during the specimen production process, which makes it difficult to control non-related variables in the specimen production process, thus affecting the test results.

[0007] The present invention discloses a combined rock-like double-hole specimen forming mold device and a use method, which can realize the efficient and refined production of rock-like double-hole specimens of any combination shape, thereby facilitating in-depth research on the instability mode and failure mechanism of underground rock parallel caverns under complex conditions. Summary of the invention

[0008] An object of the present invention is to provide a combined rock-like double-hole 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 purpose is achieved by adopting the following technical solutions:

[0010] A combined rock-like double-hole specimen forming device and a specimen forming method, comprising a bottom plate and a rectangular ring frame, wherein the rectangular ring frame is detachably connected to the upper end surface of the bottom plate; two vertical position adjustment components are detachably connected to two opposite side surfaces of the bottom plate, each of which is connected to a positioning bracket, each of which is connected to a horizontal position adjustment component, and the horizontal position adjustment component is connected to a tunnel model body. Preferably, the rectangular ring frame comprises four forming side panels which are detachably connected in sequence.

[0011] The vertical position adjustment component enables the positioning bracket and the tunnel model body to move in the vertical direction; the horizontal position adjustment component enables the tunnel model body to move in the horizontal direction.

[0012] A first telescopic component is arranged between the horizontal position adjustment 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] When in use, the rectangular ring frame is connected to the bottom plate; the two vertical position adjustment components are respectively connected to the two opposite sides of the bottom plate; the two positioning brackets are respectively connected to the two vertical position adjustment components;

[0014] 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 move in the vertical direction; the horizontal position adjustment component is used to make the tunnel model body move in the horizontal direction; vaseline is evenly applied on the inner side of the rectangular ring frame and the upper end surface of the bottom plate; vaseline is evenly applied on the outer surfaces of the two tunnel model bodies;

[0015] Adjusting a first telescopic assembly disposed between the horizontal position adjustment assembly and the tunnel model body, the first telescopic assembly makes the lower end of the tunnel model body contact the upper end of the bottom plate;

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

[0017] 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 upward. When the two tunnel model bodies are taken out, a second layer of plastic wrap is covered on the bottom plate to seal the double-hole openings formed after the two tunnel model bodies are taken out;

[0018] After the second preset time, the preset double-hole tunnel material solidifies to obtain a molded test piece on the bottom plate; the rectangular ring frame is removed from the bottom plate;

[0019] Tap the side of the base plate to separate the molded specimen from the base plate.

[0020] Compared with the existing forming device, the present device can conveniently and quickly disassemble and assemble the double-hole specimen forming device, and is easy to operate and can be reused. In addition, the present device can be applied to the production of different specimens. During operation, the positions of the two tunnel model bodies on the bottom plate can be adjusted by the vertical position and horizontal position adjustment components, so that it is applicable to the production of forming specimens of double-hole tunnels with different position relationships, and has a wider range of applications.

[0021] Specifically, the vertical position adjustment component can be of various structures. The inventor has preferred a structure of a vertical position adjustment component, in which the vertical position adjustment component includes two scale slide grooves, and the two scale slide grooves are detachably connected to two opposite sides of the base plate; the scale slide groove includes a slide groove 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 of the slide rail groove.

[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 inserted into the hollow cylindrical support. The lower end of the hollow cylindrical support is connected to the convex base. 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 to 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 are moved in 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 adjustment 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 assembly includes a vertical rack and a fixture, the vertical rack is threadedly connected to a lifting fixture, the lower end of the vertical rack is connected to the inner ring of the roller bearing of the fixture, the lower end of the fixture is detachably connected to the tunnel model body, and the tunnel model body is moved up and down by rotating the vertical rack. Preferably, a horizontal bubble meter is provided on the lifting fixture.

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

[0028] The present invention provides a combined rock-like double-hole specimen forming device and a specimen forming method, which improve the integration and reuse rate of the rock-like double-hole specimen forming device. The device is convenient to assemble and disassemble, the components have a high degree of fit, and the device has good controllability. Therefore, it is easier to achieve refined control of the device during the specimen production process. At the same time, the device has strong adaptability in specimen production, and can complete the production of specimens for double-hole tunnel conditions with various structural types and various position relationships, further improving the reuse efficiency of the device and the production efficiency of test specimens, and reducing the test cycle.

[0029] This device can realize the refined production of specimens with various configurations and various position combinations of double-hole tunnel models. According to the engineering test background and test purpose, the plane shape and relative position relationship of the tunnel model body can be quickly adjusted in real time, and the precise positioning of the tunnel model body can be achieved through the slide scale and the horizontal position control rod. It can effectively reduce the influence of other non-related variable factors on the test results during the specimen production process, further improve the reliability of the test results, and contribute to the in-depth study of the instability mode and failure mechanism of parallel caverns in underground rock masses 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, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

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

[0032] Figure 2 is a schematic diagram of the structure of the base plate;

[0033] Figure 3 It is a structural schematic diagram of the formed side panel;

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

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

[0036] Figure 6 is a structural schematic diagram of a horizontal position fixer;

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

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

[0039] Fig. 9 This is a schematic diagram of the structure of the device after assembly.

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

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

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description 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 terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present invention.

[0044] Example 1

[0045] like Figure 1 As shown, this structure includes a bottom plate 3 and a rectangular ring frame. The bottom plate 3 has a structure as shown in Figure 2 As shown, the bottom plate 3 is a stainless steel groove box, which is welded from stainless steel plates, and 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 plates of the bottom plate 3.

[0046] The rectangular ring frame includes four first-order detachable molded side panels 4. The molded side panels 4 are as follows: Figure 3 As shown, the formed side plate 4 is a trapezoidal hollow steel column, and the formed side plate 4 is welded from stainless steel bars, and has a total length of 230 mm, a height of 30 mm, and a width of 30 mm. The length of the inner part of the rectangular ring frame is 200 mm, the width is 200 mm, and the height is 30 mm. Two opening slots 5 are provided on the formed side plate 4, and the opening slots 5 on the four formed side plates 4 are connected to the threaded openings of the upper surface steel plate of the bottom plate 3 by bolts.

[0047] Two vertical position adjustment components are detachably connected to two opposite sides of the base plate 3, each of which is connected to a positioning bracket, each of which 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 component enables the positioning bracket and the tunnel model body 2 to move in the vertical direction; the horizontal position adjustment component enables the tunnel model body 2 to move in the horizontal direction.

[0048] When in use, the rectangular ring frame is connected to the bottom plate 3; the two vertical position adjustment components are respectively connected to the two opposite sides of the bottom plate 3; the two positioning brackets are respectively connected to the two vertical position adjustment components;

[0049] According to the position information of the double-hole tunnel, the vertical position adjustment component is adjusted to move the positioning bracket and the tunnel model body 2 in the vertical direction; the horizontal position adjustment component moves the tunnel model body 2 in the horizontal direction.

[0050] In some embodiments, the two vertical position adjustment components are two telescopic rods, and the positioning bracket and the tunnel model body 2 are moved in the vertical direction by the extension and retraction of the telescopic rods; the horizontal position adjustment components are also telescopic rods, and the tunnel model body 2 is moved in the horizontal direction by the extension and retraction of the telescopic rods.

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

[0052] Example 2

[0053] On the basis of the above embodiment, the vertical position adjustment assembly includes two scale slides 1, and the two scale slides 1 are detachably connected to two opposite sides of the bottom plate 3; Figure 4As shown, the scale slide 1 includes a slide scale 7 and a slide rail groove 6. The total height of the scale slide 1 is 60 mm and the total width is 40 mm. The slide rail groove 6 is arranged along the length direction of the scale slide 1, and the total length of the slide rail groove 6 is 200 mm. The slide scale 7 is arranged on the upper surface of the scale slide 1. Slide connection holes 8 are respectively arranged at both ends of the length direction of the scale slide 1. When the scale slide 1 is connected to the base plate 3, the bolts are connected to the slide connection holes 8 and the threaded holes on the side steel plate of the base plate 3.

[0054] 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. The length direction of the scale slide 1 is the vertical direction.

[0055] Example 3

[0056] Based on the above embodiment, the positioning bracket is as follows Figure 5 As 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 inserted into the hollow cylindrical support 11, and the lower end of the hollow cylindrical support 11 is connected to the convex base 10. The cylindrical lifting bracket 12 can rotate circumferentially in the hollow cylindrical support 11; the horizontal position connector 13 is connected to the upper end of the cylindrical lifting bracket 12.

[0057] The convex base 10 can be inserted into the slide rail groove 6 to slide, thereby driving the positioning bracket to move as a whole in the plane along the slide rail groove 6. The hollow cylindrical support 11 is located on the upper part of the convex base 10 and is rigidly connected to the convex base 10. The height of the hollow cylindrical support 11 is 100mm and the diameter is 20mm. The bottom of the hollow cylindrical support 11 is engraved with a slide groove scale pointer 15. The specific position of the positioning bracket is determined by the scale value on the corresponding slide groove scale 7.

[0058] A vertical pointer 16 is engraved on the upper part of the hollow cylindrical support 11. The cylindrical lifting bracket 12 has a total length of 200 mm and a diameter slightly smaller than 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 tightening the lifting bracket control bolt 17 set on the upper part of the hollow cylindrical support 11 clockwise, and the cylindrical lifting bracket 12 can be moved up and down and rotated by loosening the lifting bracket control bolt 17 counterclockwise. The outer surface of the cylindrical lifting bracket 12 is engraved with a vertical line 18 in the length direction.

[0059] A first telescopic component is arranged 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 .

[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. The structure of the horizontal position fixer 14 is as follows: Figure 6 As 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 is detachably connected to the horizontal position connector 13 through 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 and has a diameter of 10 mm, and a horizontal rod fixing bolt 22 is provided on 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] The horizontal position connector 13 is fixed to the upper part of the cylindrical lifting bracket 12 and connected to the horizontal position fixture 14 through the fixture control bolt 19. The horizontal position fixture 14 can be fixedly connected by tightening the fixture control bolt 19 clockwise, and the horizontal position fixture 14 can be freely rotated around the fixture screw 20 by loosening the fixture control bolt 19 counterclockwise.

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

[0064] When in use, the convex base 10 is embedded in the slide rail groove 6, and the convex base 10 slides in the slide rail groove 6, and the slide groove scale pointer 15 points to the slide groove scale 7 to obtain the vertical position of the tunnel model body 2.

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

[0066] The position of the horizontal position control rod 9 in the horizontal position fixer 14 is adjusted 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] Example 4

[0068] On the basis of the above embodiment, a first telescopic component is arranged 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 .

[0069] In some embodiments, the first telescopic component is a telescopic rod, and the tunnel model body 2 is moved by the telescopic rod to adjust the distance between the tunnel model body 2 and the bottom plate 3.

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

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

[0072] A threaded hole is provided in the middle of the lifting fixture 26, and the vertical rack 25 is connected to the lifting fixture 26 through the threaded hole. A lifting fixing bolt hole 29 is reserved on one side of the lifting fixture 26. The horizontal position control rod 9 is connected to the lifting fixture 26 by screwing the threaded end of the horizontal position control rod 9 into the lifting fixing bolt hole 29. A horizontal bubble gauge 30 is provided on the lifting fixture 26.

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

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

[0075] When the hand crank 23 and the stainless steel disc 24 rotate, the vertical rack 25 is driven to rotate and move up and down along the lifting fixture 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 fixture 28, when the vertical rack 25 rotates, the fixture 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 follows: Figure 8 As shown, the tunnel model body 2 is a solid stainless steel component with a height of 30 mm. The plane shape of the tunnel model body 2 can be processed into different shapes such as circle, ellipse and horseshoe according to the background and purpose of the underground cave test research.

[0077] A tunnel model fixing screw 31 with a diameter of 10 mm and a length of 15 mm is provided on the upper part of the tunnel model body 2 . The fixer 28 is fixed on the fixer 28 by screwing the tunnel model fixing screw 31 into the central threaded hole of the fixer 28 .

[0078] This device can realize the efficient and refined production of rock-like double-hole specimens of any combination of shapes. This device has the characteristics of high integration and high reuse rate. It can produce rock-like double-hole tunnel specimens of various configurations and various position combinations, and can realize refined control of the specimen production process.

[0079] Example 5

[0080] Based on the above embodiment, a combined rock-like double-hole specimen forming method includes the following steps:

[0081] Step 1, based on the background of the double-tunnel engineering and the purpose of the test, determine the plane shape of the tunnel model body 2, and determine the plane size 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 the two tunnel model bodies 2 in advance according to the plane size of the tunnel model bodies 2 for standby use. At the same time, determine and record the scale values ​​corresponding to the chute scale 7 and the horizontal position control rod 9 in advance according to the relative position relationship between the two tunnels, so as to prepare for the subsequent precise positioning of the two tunnel model bodies 2;

[0082] Step 2, place the bottom plate 3 with the plane facing upward and the groove facing downward, connect the four forming side plates 4 end to end and connect them with bolts to form a rectangular ring frame, and fix the rectangular ring frame on the plane of the bottom plate 3 by bolts to form a specimen forming platform; a casting platform space for a double-hole tunnel-like rock mass-like material with a four-side length of 200 mm and a thickness of 30 mm is formed in the rectangular ring frame on the specimen forming platform;

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

[0084] Step 4, respectively embed the convex bases 10 of the two sets of positioning brackets into the slide rail grooves 6 of the two scale slide grooves 1 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 fixture 26, and tighten the horizontal rod fixing bolt 22 clockwise to fix the horizontal position control rod 9;

[0086] Step 6, respectively install the two tunnel model bodies 2 prepared in advance on the fixture 28. During installation, the tunnel model fixing screw 31 needs to be screwed into the central threaded hole of the fixture 28 and fully tightened;

[0087] Step 7, according to the relative position relationship between the two tunnels determined in the test plan, the two tunnel model bodies 2 are accurately positioned;

[0088] First, move the convex bases 10 of the two positioning brackets along the slide groove 6 respectively, so that the slide scale pointer 15 on the hollow cylindrical support 11 is aligned with the predetermined 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 rotate it slowly. After aligning the vertical pointer 16 on the hollow cylindrical support 11 and 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 slide 1.

[0090] Loosen the fixer control bolt 19 counterclockwise to allow the horizontal position fixer 14 to rotate around the fixer screw 20, and observe the bubble in the horizontal bubble meter 30 at the same time. When the bubble is centered, quickly tighten the fixer 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 allow the horizontal position control rod 9 to move horizontally. After observing that the scale on the horizontal position control rod 9 reaches a predetermined position, tighten the horizontal rod fixing bolt 22 clockwise to fix the horizontal position control rod 9, thereby completing the positioning of the tunnel model body 2. In this step, the positioning process of the two tunnel model bodies 2 is the same. After adjustment, the device is as follows Fig. 9 As shown;

[0091] Step 8, 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; so that the double-hole specimen can be smoothly demoulded, and then the hand crank 23 and the stainless steel disc 24 are rotated 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 on 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 rock-like similar material pouring platform space, stop pouring, and knock the side of the bottom plate 3 with a rubber hammer to reduce the pouring pores, so that the preset double-hole tunnel material can fill the entire similar material pouring platform space, and ensure that the preset double-hole tunnel material can fully wrap the two tunnel model bodies 2, and cover the bottom plate 3, that is, the similar material pouring platform space, with a first layer of plastic wrap for sealing and maintenance; wherein the preset double-hole tunnel material is a uniformly mixed double-hole tunnel rock-like similar material

[0093] Step 10, after the first preset time, the preset double-hole tunnel material is initially solidified, the hand crank 23 and the stainless steel disc 24 are rotated counterclockwise to slowly lift the two tunnel model bodies 2 upward, and 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; the first preset time is 40-50 minutes, preferably 45 minutes;

[0094] 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 second preset time is 5-7 hours, preferably, the second preset time is 6 hours;

[0095] The side surface of the bottom plate 3 is knocked to separate the molded specimen from the bottom plate 3 .

[0096] The terms "first", "second", "third", etc. used herein are only used to distinguish the corresponding components for the sake of clarity of description, and are not intended to limit any order or emphasize importance, etc. In addition, the term "connected" used herein, unless otherwise specified, may refer to direct connection or indirect connection via other components.

[0097] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A combined rock-like double-hole specimen forming device, characterized in that: It 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); the vertical position adjustment components are each connected to a positioning bracket; the positioning bracket is each connected to a horizontal position adjustment component; the horizontal position adjustment component is connected to a tunnel model body (2); the vertical position adjustment components enable the positioning bracket 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.

2. 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 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 sides 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 combined rock-like double-hole specimen forming device according to claim 1, characterized in that: The horizontal position adjustment component comprises a horizontal position connector (13) and a horizontal position fixer (14); the horizontal position connector (13) is connected to a 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 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 fixer (28); the vertical rack (25) is threadedly connected with a lifting fixer (26); the lower end of the vertical rack (25) is connected to the inner ring of a roller bearing (27) of the fixer (28); the lower end of the fixer (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 combined rock-like double-hole specimen forming device according to claim 5, characterized in that: A horizontal bubble meter (30) is arranged on the lifting fixture (26).

7. 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 combined rock-like double-hole specimen forming device according to claim 7, characterized in that: A vertical line (18) is arranged on the cylindrical lifting bracket (12), and a vertical pointer (16) is arranged 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 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.

10. A combined rock-like double-hole specimen forming method, characterized in that: The molding device according to any one of claims 1 to 9 comprises the following steps: Connecting the rectangular ring frame to the bottom plate (3); The two vertical position adjustment components are respectively connected to two opposite side surfaces of the base plate (3); 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); The preset double-hole tunnel material is poured onto the bottom plate (3); when the preset double-hole tunnel material covers the upper end surface of the rectangular ring frame, the side of the bottom plate (3) is knocked to make the preset double-hole tunnel material wrap the tunnel model body (2); and a first layer of plastic wrap is covered on the bottom plate (3) 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. After 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).

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