A test device for testing the strength of new material roadway support under simulated rockburst conditions

Abstract

This application discloses a testing device for the strength of new material roadway support under simulated rockburst conditions, belonging to the field of strength testing technology. The device includes a support platform with a testing stage mounted on its inner upper surface. An electric telescopic rod is embedded at the top of the support platform, and a slider connected to the movable end of the electric telescopic rod is slidably connected to the inner side of the support platform. A pressure assembly is mounted at the bottom of the slider. This application uses a pressure assembly with multiple pressure rods of varying heights and hemispherical compression blocks. A motor drives a concave disc to rotate, and the hemispherical compression blocks sequentially push the pressure rods at different positions downwards, creating a random, non-uniform compression effect similar to that produced by the surrounding rock on the support structure during a rockburst. This significantly improves the accuracy of testing the load-bearing capacity of the new material support structure during a rockburst.

Description

Technical Field

[0001] This invention belongs to the field of strength testing technology, specifically relating to a new material tunnel support strength testing device under simulated rockburst conditions. Background Technology

[0002] Tunnel support is a core component of safe construction in underground engineering projects (such as mines and tunnels). Rockbursts, as a typical dynamic disaster, are characterized by their suddenness and high destructive energy, placing stringent demands on the compressive toughness of support structures. In recent years, with the application of new materials (such as high-toughness concrete and composite anchor bolts) in the field of support, accurately simulating the multi-point, non-uniform, dynamic compression and shear composite loads generated by rockbursts has become a technical challenge in testing the strength of new material support.

[0003] Existing tunnel support strength testing devices generally employ a single hydraulic cylinder or electric actuator for vertical static pressure loading. Such devices can only simulate uniformly distributed loads or center-point loads, and cannot reproduce the "random multi-point ejection" and "non-uniform compression-shear" stress states generated by the surrounding rock on the support plate during rock bursts. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a new material tunnel support strength testing device under simulated rockburst conditions, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a test device for the strength of roadway support of a new material under simulated rockburst conditions, comprising a support platform, a test platform mounted on the inner upper surface of the support platform, an electric telescopic rod embedded at the top of the support platform, a slider slidably connected to the movable end of the electric telescopic rod on the inner side of the support platform, a pressure assembly mounted at the bottom of the slider, the pressure assembly comprising a fixed rod fixed to the bottom of the slider, a motor mounted at the bottom of the slider, and four positioning slide rods fixed to the bottom of the slider, a gear I fixed at the output shaft of the motor, a concave disc slidably connected to the bottom of the four positioning slide rods, a gear II meshing with gear I fixed to the outer side of the concave disc, a plurality of hemispherical extrusion blocks fixed to the bottom of the concave disc, a horn disc fixed to the bottom of the fixed rod, a plurality of pressure rods slidably connected through and slidably connected to the inside of the horn disc, a spring I fixed between each pressure rod and the horn disc, and a spherical block fixed to the top of each pressure rod. This application sets up a pressure assembly with multiple pressure rods of varying heights and hemispherical extrusion blocks. The concave disc is driven to rotate by a motor, and the hemispherical extrusion blocks push the pressure rods at different positions downward in sequence, forming a random and non-uniform extrusion of the support structure by the surrounding rock during a rockburst. This significantly improves the accuracy of testing the load-bearing capacity of the new material support structure during a rockburst.

[0006] Furthermore, the new material tunnel support plate is held in the rectangular groove of the test bench by clamping components, and through grooves are provided on both sides of the rectangular groove of the test bench.

[0007] Furthermore, the spherical block is located on the movement trajectory of the hemispherical extrusion block, and the heights of every two adjacent pressure rods are inconsistent, with the initial height of the outer pressure rod being lower than that of the inner pressure rod.

[0008] Furthermore, the pressure assembly is internally equipped with an auxiliary pressure-applying assembly for applying pressure in the middle.

[0009] Furthermore, the auxiliary pressure application component includes an annular tooth fixed to the inner wall of the central groove of the concave disc, a rotating rod rotatably connected to the inner groove of the fixed rod, a gear three rotatably connected to the side groove of the fixed rod, and a hollow pressure block mounted on the bottom of the horn disc via a spring three. A gear four is fixed to the upper outer end of the rotating rod. One side of the gear three meshes with the annular tooth, and the other side meshes with the gear four. Guide rods are symmetrically fixed to the lower outer end of the rotating rod, and a spiral track is fixed to the inner wall of the hollow pressure block. This application assembles an auxiliary pressure application component in the central part of the concave disc. Through the structure of the annular tooth, gear three, and gear four, the hollow pressure block is driven to independently apply auxiliary pressure to the central area of ​​the new material tunnel support plate. Simultaneously, the hollow pressure block cyclically applies intermittent pressure to the central area of ​​the new material tunnel support plate, which can more accurately detect the overall structural stability and local compressive strength of the new material tunnel support plate under complex stress conditions.

[0010] Furthermore, there are two spiral tracks, and the guide rod is located between the two spiral tracks. The top and bottom of the spiral tracks have a gap in the vertical direction, which is used for the vertical movement of the guide rod.

[0011] Furthermore, an annular bracket is fixed to the side of the concave disc, and an annular track is fixed to the bottom of the annular bracket. The bottom of the annular track is symmetrically provided with arc-shaped grooves.

[0012] Furthermore, both sides of the horn disc are equipped with tension components. Each tension component includes an L-shaped bracket fixed to the side of the horn disc, a movable rod slidably connected to the side of the L-shaped bracket, a ball fixed to the top of the movable rod, a spring four fixed between the movable rod and the L-shaped bracket, and a shaped toothed rod fixed to the bottom of the movable rod. The lower inner end of the L-shaped bracket is rotatably connected to a tension plate via a rotating shaft, and a gear five is fixed to the middle of the rotating shaft. This application provides tension components on both sides of the horn disc, utilizing a circular track to control the engagement timing of the shaped toothed rod and gear five, allowing the tension plate to rotate 90 degrees during pressure application. This applies a vertical tension to the new material tunnel support plate, significantly improving the comprehensive strength testing capability of the new material tunnel support structure under complex stress paths.

[0013] Furthermore, the gear five meshes with the irregularly shaped toothed rod, the sphere is attached to the bottom of the annular track, and the spring four is in a compressed state in the initial state.

[0014] Furthermore, the teeth of the irregularly shaped gear can only control the gear five to rotate 90 degrees.

[0015] The advantages of this application are:

[0016] (1) This application sets up a pressure assembly with multiple pressure rods of different heights and hemispherical extrusion blocks. The concave disc is driven to rotate by a motor, and the hemispherical extrusion blocks push the pressure rods at different positions downward in sequence to form a random and non-uniform extrusion of the surrounding rock on the support structure, similar to the rock burst process. This significantly improves the accuracy of testing the bearing capacity of the new material support structure during the rock burst process.

[0017] (2) The present application is equipped with an auxiliary pressure component in the middle of the concave disc. Through the ring tooth, gear three and gear four structure, the hollow pressure block is driven to independently apply auxiliary pressure to the central area of ​​the new material roadway support plate. At the same time, the hollow pressure block will repeatedly apply intermittent pressure to the central area of ​​the new material roadway support plate, which can more accurately detect the overall structural stability and local compressive strength of the new material roadway support plate under complex stress state.

[0018] (3) The present application sets tension components on both sides of the horn plate and uses the ring track to control the meshing time of the irregular toothed rod and the fifth gear, so that the tension plate can rotate ninety degrees during the pressure process, thereby applying vertical tension to the new material roadway support plate, which significantly improves the comprehensive strength test capability of the new material roadway support structure under complex stress path. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the test bench and its assembly structure of the present invention;

[0021] Figure 3 This is a partial structural schematic diagram of the present invention;

[0022] Figure 4 This is a schematic diagram of the pressure component structure of the present invention. Figure 1 ;

[0023] Figure 5 This is a schematic diagram of the pressure component structure of the present invention. Figure 2 ;

[0024] Figure 6 This is a schematic diagram of the pressure component structure of the present invention. Figure 3 ;

[0025] Figure 7 This is the present invention. Figure 6 Enlarged view of point A in the middle;

[0026] Figure 8 This is a schematic diagram of the auxiliary pressure application component structure of the present invention;

[0027] Figure 9 This is a partial structural diagram of the auxiliary pressure application component of the present invention;

[0028] Figure 10 This is a schematic diagram of the tension component structure of the present invention. Figure 1 ;

[0029] Figure 11 This is a schematic diagram of the tension component structure of the present invention. Figure 2 ;

[0030] Figure 12 This is a schematic diagram of the tension component structure of the present invention. Figure 3 ;

[0031] Figure 13 This is the present invention. Figure 12 Enlarged view of section B in the middle.

[0032] Explanation of key figure labels:

[0033] 100. Support platform; 200. Test platform; 201. Clamping component; 202. Through slot; 203. Rectangular slot; 300. Electric telescopic rod; 400. Slider;

[0034] 500. Pressure assembly; 501. Fixing rod; 502. Positioning slide rod; 503. Motor; 504. Gear 1; 505. Concave disc; 506. Gear 2; 507. Horn disc; 508. Hemispherical extrusion block; 509. Pressure rod; 510. Spring 1; 511. Spherical block;

[0035] 600. Auxiliary pressure application component; 601. Ring gear; 602. Rotating rod; 603. Spring three; 604. Hollow pressure block; 605. Gear four; 606. Gear three; 607. Helical track; 608. Guide rod;

[0036] 700. Tension assembly; 701. Circular bracket; 702. Circular track; 703. Arc groove; 705. L-shaped bracket; 706. Movable rod; 707. Spring four; 708. Sphere; 709. Irregularly shaped toothed rod; 710. Rotating shaft; 711. Tension plate; 712. Gear five;

[0037] M, New material tunnel support plate. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0039] Example 1, as Figures 1-7As shown, a test device for testing the strength of a new material roadway support under simulated rockburst conditions includes a support platform 100. A test platform 200 is mounted on the upper inner surface of the support platform 100. A new material roadway support plate M is held in a rectangular groove 203 of the test platform 200 by clamping members 201. Through slots 202 are formed on both sides of the rectangular groove 203 inside the test platform 200. An electric telescopic rod 300 is embedded in the top of the support platform 100. A slider 400, connected to the movable end of the electric telescopic rod 300, is slidably connected to the inner side of the support platform 100. A pressure assembly 500 is mounted on the bottom of the slider 400. The pressure assembly 500 includes a fixing rod 501 fixed to the bottom of the slider 400, a motor 503 mounted on the bottom of the slider 400, and four positioning sliding rods 502 fixed to the bottom of the slider 400. A gear 504 is fixed at the output shaft. The bottom of the four positioning slide rods 502 is slidably connected to a concave disc 505. A gear 506 that meshes with the gear 504 is fixed to the outside of the concave disc 505. Multiple hemispherical extrusion blocks 508 are fixed to the bottom of the concave disc 505. A horn disc 507 is fixed to the bottom of the fixing rod 501. Multiple pressure rods 509 are slidably connected through the inside of the horn disc 507. A spring 510 is fixed between each pressure rod 509 and the horn disc 507. A spherical block 511 is fixed to the top of each pressure rod 509. The spherical block 511 is located on the movement trajectory of the hemispherical extrusion block 508. The heights of two adjacent pressure rods 509 are not the same. The initial height of the outer pressure rod 509 is lower than the initial height of the inner pressure rod 509. This application sets up a pressure assembly 500 with multiple pressure rods 509 of varying heights and a hemispherical extrusion block 508. The concave disc 505 is driven to rotate by a motor 503, and the hemispherical extrusion block 508 pushes the pressure rods 509 at different positions downward to apply pressure, forming a random and non-uniform extrusion of the support structure by the surrounding rock during a rockburst, which significantly improves the accuracy of testing the load-bearing capacity of the new material support structure during a rockburst.

[0040] When using the above equipment, first place the new material tunnel support plate M to be tested in the rectangular slot 203 of the test table 200 and fix it with the clamp 201. Then start the electric telescopic rod 300 to push the slider 400 and the entire pressure assembly 500 downward until the pressure rod 509 at the bottom of the horn plate 507 approaches the upper surface of the new material tunnel support plate M.

[0041] Then, motor 503 is started, which drives gear 1 504 to rotate. Gear 1 504 drives gear 2 506 to rotate, which in turn drives the concave disc 505 to rotate slowly. Multiple hemispherical extrusion blocks 508 are fixed to the bottom of the concave disc 505. These hemispherical extrusion blocks 508 rotate with the concave disc 505, sequentially extruding and pushing the spherical blocks 511 at the top of different pressure rods 509 below. Since the initial height of each pressure rod 509 is different (lower on the outer side and higher on the inner side), and the hemispherical extrusion blocks 508 rotate continuously, Therefore, the pressure rod 509 will be randomly pressed downwards, thus producing a squeezing and impact effect on the new material tunnel support plate M similar to that of the surrounding rock during a rockburst, applied from different positions, angles, and time points. At the same time, each pressure rod 509 is equipped with a spring 510. When the hemispherical compression block 508 rotates, the spring 510 will push the pressure rod 509 back to its original position, thus achieving repeated and cyclic loading. By observing the deformation and damage of the new material tunnel support plate M under compression at different positions and in different sequences, its ability to resist multi-point random compression during a rockburst can be evaluated.

[0042] Example 2, as Figures 4-9 As shown, based on Embodiment 1, the pressure assembly 500 is internally equipped with an auxiliary pressure-applying assembly 600 for applying pressure in the middle. The auxiliary pressure-applying assembly 600 includes an annular tooth 601 fixed to the inner wall of the central circular groove of the concave disc 505, a rotating rod 602 rotatably connected to the inner groove of the fixed rod 501, a gear 606 rotatably connected to the side groove of the fixed rod 501, and a hollow pressure block 604 mounted to the bottom of the horn disc 507 via a spring 603. The upper outer end of the rotating rod 602 is fixed. Gear 4 605 is fixed. One side of gear 3 606 meshes with the ring tooth 601, and the other side of gear 3 606 meshes with gear 4 605. Guide rods 608 are symmetrically fixed at the lower outer side of rotating rod 602. Helical rails 607 are fixed on the inner wall of hollow pressure block 604. There are two helical rails 607, and the guide rod 608 is located between the two helical rails 607. The top and bottom of the helical rails 607 have a gap in the vertical direction, which is used for the vertical movement of guide rod 608. This application assembles an auxiliary pressure component 600 in the middle of the concave disc 505. Through the structure of the ring tooth 601, gear three 606 and gear four 605, the hollow pressure block 604 is driven to independently apply auxiliary pressure to the central area of ​​the new material tunnel support plate M. At the same time, the hollow pressure block 604 will cyclically apply intermittent pressure to the central area of ​​the new material tunnel support plate M, which can more accurately detect the overall structural stability and local compressive strength of the new material tunnel support plate M under complex stress conditions.

[0043] In specific use, based on Embodiment 1, when the motor 503 drives the concave disc 505 to rotate, the annular teeth 601 on the inner wall of the central groove of the concave disc 505 will rotate accordingly, thereby driving the gear three 606 to rotate. The rotation of the gear three 606 then drives the gear four 605 and the rotating rod 602 to rotate, causing the guide rod 608 below the rotating rod 602 to rotate accordingly. The guide rod 608 is inserted into the spiral track 607 inside the hollow pressure block 604. Since the spiral track 607 has two spiral grooves, the guide rod 608 will squeeze the spiral track 607 and the hollow pressure block 604 downwards along the trajectory of the spiral track 607 when rotating. After moving to the top of the spiral track 607, it will separate from it. Then, with the action of the spring three 603, the hollow pressure block 604 will move upwards. The hollow pressure block 604 will generate intermittent, cyclical additional pressure on the central area of ​​the new material tunnel support plate.

[0044] In this way, the outer pressure rod 509 simulates the multi-point random impact of rock bursts, while the central hollow pressure block 604 simulates the continuous compression of the surrounding rock. The two compression methods work simultaneously, which can more comprehensively test the overall stability and local compressive strength of the new material tunnel support plate M under complex stress conditions.

[0045] Example 3, as Figures 1-13 As shown, based on Embodiment 1, an annular bracket 701 is fixed to the side of the concave disc 505, and an annular track 702 is fixed to the bottom of the annular bracket 701. The bottom of the annular track 702 is symmetrically provided with arc-shaped grooves 703. Both sides of the horn disc 507 are equipped with tension components 700. The tension component 700 includes an L-shaped bracket 705 fixed to the side of the horn disc 507. A movable rod 706 is slidably connected to the side of the L-shaped bracket 705. A ball 708 is fixed to the top of the movable rod 706. A spring 707 is fixed between the 6-shaped support and the L-shaped bracket 705. A shaped toothed rod 709 is fixed to the bottom of the movable rod 706. A tension plate 711 is rotatably connected to the lower end of the L-shaped support 705 via a rotating shaft 710. A gear 712 is fixed in the middle of the rotating shaft 710. The gear 712 meshes with the shaped toothed rod 709. The teeth of the shaped toothed rod 709 can only control the gear 712 to rotate 90 degrees. The ball 708 is attached to the bottom of the annular track 702, and the spring 707 is in a compressed state in the initial state. This application sets tension components 700 on both sides of the trumpet disk 507. The annular track 702 controls the meshing time of the shaped toothed rod 709 and the gear 712, so that the tension plate 711 can rotate 90 degrees during the pressure application, thereby applying a horizontal tension to the new material tunnel support plate M, which significantly improves the comprehensive strength testing capability of the new material tunnel support structure under complex stress paths.

[0046] When the concave disc 505 rotates, the annular bracket 701 and annular track 702 fixed on the side of the concave disc 505 will also rotate. The bottom of the annular track 702 has an arc groove 703. The L-shaped brackets 705 on both sides of the horn disc 507 are slidably connected to the movable rod 706. The ball 708 at the top of the movable rod 706 originally slid along the bottom of the annular track 702.

[0047] When the ball 708 slides into the arc groove 703, the movable rod 706 will move upward a short distance under the action of the spring 707, which will drive the irregular toothed rod 709 at the bottom to move upward as well. When the irregular toothed rod 709 moves upward, it will drive the gear 712 to rotate 90 degrees. The gear 712 will then drive the tension plate 711 to flip from the vertical direction to the horizontal direction through the rotating shaft 710.

[0048] The flipped tension plate 711 applies a vertical tension to the side of the new material roadway support plate M. By observing the damage and deformation of the new material roadway support plate M after the tension is applied, the data of the tensile strength test can be obtained.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A test device for testing the strength of roadway support made of new materials under simulated rockburst conditions, comprising a support platform (100), wherein a test platform (200) is mounted on the inner upper surface of the support platform (100), an electric telescopic rod (300) is embedded in the top of the support platform (100), and a slider (400) connected to the movable end of the electric telescopic rod (300) is slidably connected to the inner side of the support platform (100), characterized in that, The bottom of the slider (400) is equipped with a pressure assembly (500), which includes a fixing rod (501) fixed to the bottom of the slider (400), a motor (503) mounted to the bottom of the slider (400), and four positioning slide rods (502) fixed to the bottom of the slider (400). A gear (504) is fixed to the output shaft of the motor (503). The bottoms of the four positioning slide rods (502) are slidably connected to a concave disc (505). Gear 2 (506) is fixed on the outside and meshes with gear 1 (504). Multiple hemispherical extrusion blocks (508) are fixed at the bottom of the concave disc (505). A horn disc (507) is fixed at the bottom of the fixing rod (501). Multiple pressure rods (509) are slidably connected through the inside of the horn disc (507). A spring 1 (510) is fixed between each pressure rod (509) and the horn disc (507). A spherical block (511) is fixed at the top of each pressure rod (509).

2. The test device for testing the strength of new material roadway support under simulated rockburst conditions according to claim 1, characterized in that, The new material roadway support plate (M) is held in the rectangular groove (203) of the test bench (200) by a clamping member (201). Through grooves (202) are provided on both sides of the rectangular groove (203) in the test bench (200).

3. The test device for testing the strength of new material roadway support under simulated rockburst conditions according to claim 2, characterized in that, The spherical block (511) is located on the movement trajectory of the hemispherical extrusion block (508). The heights of every two adjacent pressure rods (509) are inconsistent, with the initial height of the outer pressure rod (509) being lower than that of the inner pressure rod (509).

4. The test device for testing the strength of new material roadway support under simulated rockburst conditions according to claim 3, characterized in that, The pressure assembly (500) is internally equipped with an auxiliary pressure assembly (600) for applying pressure in the middle.

5. The test device for testing the strength of new material roadway support under simulated rockburst conditions according to claim 4, characterized in that, The auxiliary pressure application component (600) includes an annular tooth (601) fixed on the inner wall of the central groove of the concave disc (505), a rotating rod (602) rotatably connected to the inner groove of the fixed rod (501), a gear three (606) rotatably connected to the side groove of the fixed rod (501), and a hollow pressure block (604) assembled at the bottom of the horn disc (507) by a spring three (603). A gear four (605) is fixed to the upper outer side of the rotating rod (602). One side of the gear three (606) meshes with the annular tooth (601), and the other side of the gear three (606) meshes with the gear four (605). A guide rod (608) is symmetrically fixed to the lower outer side of the rotating rod (602). A spiral track (607) is fixed to the inner wall of the hollow pressure block (604).

6. The test device for testing the strength of new material roadway support under simulated rockburst conditions according to claim 5, characterized in that, There are two spiral tracks (607), and the guide rod (608) is located between the two spiral tracks (607). The top and bottom of the spiral tracks (607) have a gap in the vertical direction, which is used for the vertical movement of the guide rod (608).

7. The test device for testing the strength of new material roadway support under simulated rockburst conditions according to claim 6, characterized in that, The concave disc (505) has an annular bracket (701) fixed on its side, and an annular track (702) is fixed at the bottom of the annular bracket (701). The bottom of the annular track (702) is symmetrically provided with arc-shaped grooves (703).

8. The test device for testing the strength of new material roadway support under simulated rockburst conditions according to claim 7, characterized in that, Both sides of the horn disc (507) are equipped with tension components (700). The tension components (700) include an L-shaped bracket (705) fixed to the side of the horn disc (507). A movable rod (706) is slidably connected to the side of the L-shaped bracket (705). A ball (708) is fixed to the top of the movable rod (706). A spring (707) is fixed between the movable rod (706) and the L-shaped bracket (705). A shaped toothed rod (709) is fixed to the bottom of the movable rod (706). A tension plate (711) is rotatably connected to the lower end of the L-shaped bracket (705) through a rotating shaft (710). A gear (712) is fixed in the middle of the rotating shaft (710).

9. The test device for testing the strength of new material roadway support under simulated rockburst conditions according to claim 8, characterized in that, The gear five (712) meshes with the irregular toothed rod (709), the ball (708) is attached to the bottom of the annular track (702), and the spring four (707) is in a compressed state in the initial state.

10. The test device for testing the strength of new material roadway support under simulated rockburst conditions according to claim 9, characterized in that, The teeth of the irregularly shaped toothed rod (709) can only control the rotation of gear five (712) by ninety degrees.

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