A simulation device and method for multiple unidirectional impact load test under gradient confining pressure

Abstract

This application discloses a simulation device and method for multiple unidirectional impact load tests under gradient confining pressure, comprising a track, a specimen, and several impactors. The track includes a horizontal section, one end of which is connected to a ramp section. The specimen is located on the horizontal section, and a gradient confining pressure device is provided outside the specimen to pressurize it. Several impactors, acting as power input sources, are released from the ramp section at different heights above the ground and move along the track, sequentially impacting the specimen to apply multiple unidirectional impact loads. The impactors can be nested sequentially so that subsequent impactors can pass over earlier impactors, avoiding collisions between them. This application enables the specimen to be subjected to gradient confining pressure and multiple unidirectional impact loads to simulate the blasting damage effect of multiple blasting loads on surrounding rock with continuously changing stress states in underground engineering.

Description

Technical Field

[0001] This application relates to the field of blast load impact testing technology, and in particular to a simulation device and method for multiple unidirectional impact load tests under gradient confining pressure. Background Technology

[0002] During the blasting construction of underground caverns, millisecond delay segmented blasting technology is usually adopted. The resulting blasting load will cause multiple impacts on the surrounding rock in a short period of time. At the same time, due to the redistribution of the original rock stress caused by excavation, an uneven gradient stress state is often formed in the shallow part of the surrounding rock on the cavern outline. Based on this on-site construction background, as the blasting excavation progresses, the stress state of the surrounding rock of the underground cavern changes continuously, and the degree of blasting damage to the surrounding rock increases continuously, which may lead to the destruction and instability of the surrounding rock, thereby affecting the safe construction of the underground cavern. Therefore, in order to ensure the stability of the surrounding rock of the underground cavern during the construction period, it is necessary to study the damage effect of multiple consecutive blasting loads on the surrounding rock that continuously adjusts the stress state, so as to adjust the blasting parameters or support measures on site in a targeted manner. However, such research and experiments involve two key issues: (1) how to achieve the sample being in a gradient confining pressure state, and (2) how to control the pulse size and time interval of the impact load. Existing test equipment is difficult to meet the above requirements at the same time. Summary of the Invention

[0003] This application provides a device and method for simulating multiple unidirectional impact load tests under gradient confining pressure. It enables the specimen to be subjected to multiple unidirectional impact loads under gradient confining pressure to simulate the blasting damage effect of multiple blasting loads on surrounding rock with continuously changing stress states in underground engineering. The technical solution is as follows:

[0004] The first aspect of this application provides a simulation device for multiple unidirectional impact load tests under gradient confining pressure, comprising a track, a specimen, and several impactors. The track includes a horizontal section, one end of which is connected to a ramp section. The specimen is located on the horizontal section, and a gradient confining pressure device is provided outside the specimen to pressurize it. The several impactors, as power input sources, are released from the ramp section at different heights above the ground and move along the track, sequentially impacting the specimen to apply multiple unidirectional impact loads to it. The impactors can be nested sequentially so that impactors that later impact the specimen can pass over impactors that impacted the specimen earlier, thus avoiding collisions between the impactors.

[0005] For example, in a gradient confining pressure multiple unidirectional impact load test simulation device provided in one embodiment, the impactor includes a frame and a hollow part formed by the frame. An opening is provided at the bottom of the frame. The size of the frames and the openings of several impactors increases sequentially with the increase of the height of the impactor from the ground. They can be nested and housed in the hollow part through the openings.

[0006] For example, in a gradient confining pressure multiple unidirectional impact load test simulation device provided in one embodiment, the opening is close to the track, a pulley is provided in the opening, and a groove corresponding to the pulley is provided in the inclined section and the horizontal section of the track, and the impacting object moves along the groove through the pulley.

[0007] For example, in a gradient confining pressure multiple unidirectional impact load test simulation device provided in one embodiment, several impact objects have the same mass, and the radial dimension of the frame of several impact objects increases sequentially and the axial dimension decreases sequentially.

[0008] For example, in a gradient confining pressure multiple unidirectional impact load test simulation device provided in one embodiment, the gradient confining pressure device includes an array of confining pressure sleeves and a confining pressure adjustment device. The specimen is located inside the confining pressure sleeves, and a connecting wing plate is provided on the confining pressure sleeves. The confining pressure adjustment device is provided on the connecting wing plate of each array of confining pressure sleeves to adjust the confining pressure of the confining pressure sleeves and make the confining pressure of the array of confining pressure sleeves gradient distributed. The confining pressure adjustment device includes an adjusting bolt and a nut, and the confining pressure of the confining pressure sleeves is adjusted by adjusting the tightness of the nut.

[0009] For example, in a gradient confining pressure multiple unidirectional impact load test simulation device provided in one embodiment, the confining pressure sleeve includes a "C"-shaped confining pressure plate, and the connecting wing plate is provided at the joint of the two ends of the confining pressure plate. There is a deformation space between the two connecting wing plates, and the two connecting wing plates are pressurized and fixed by the confining pressure adjustment device.

[0010] For example, in a gradient confining pressure multiple unidirectional impact load test simulation device provided in one embodiment, the gradient confining pressure device further includes a pressure sensor, which is provided between the two connecting wing plates of each group of confining pressure sleeves to monitor the confining pressure of each group of confining pressure sleeves.

[0011] For example, in a gradient confining pressure multiple unidirectional impact load test simulation device provided in one embodiment, a roller is provided at the bottom of the confining pressure sleeve, and a groove adapted to the roller is provided in the horizontal section of the track. The confining pressure sleeve and the sample inside the confining pressure sleeve move along the groove through the roller.

[0012] For example, in a gradient confining pressure multiple unidirectional impact load test simulation device provided in one embodiment, the specimen is a cylindrical rock sample device and is clamped inside the confining pressure sleeve.

[0013] The second aspect of this application provides a method for simulating multiple unidirectional impact load tests under gradient confining pressure, comprising the following steps: S1, placing the specimen equipped with the gradient confining pressure device on the horizontal section of the track; S2, placing an impactor of the same mass at different heights above the ground on the inclined section of the track, wherein the radial dimension of the frame of the impactor increases with the height above the ground; S3, simultaneously releasing the impactor, wherein the impactor sequentially impacts the specimen in order of increasing height above the ground, so as to apply multiple unidirectional impact loads to the specimen.

[0014] The beneficial effects of the simulation device and method for multiple unidirectional impact load tests under gradient confining pressure provided in some embodiments of this application are as follows: The simulation device for multiple unidirectional impact load tests under gradient confining pressure of this application can apply multiple unidirectional impact loads to the specimen in a short time to obtain adjustable impact pulses, and can apply adjustable gradient confining pressure to the specimen, realizing that the specimen is under gradient confining pressure and multiple unidirectional impact loads are applied to the specimen. The simulation device of this application is easy to operate, has high experimental flexibility, and can more realistically simulate the underground cavern of engineering blasting tests. It can be used to simulate the blasting damage effect of multiple blasting loads on the surrounding rock with constantly changing stress state in underground engineering. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a diagram showing the initial position of multiple uniaxial impact load tests under gradient confining pressure as described in this application.

[0017] Figure 2 This is a diagram showing the state of the specimen after a single impact by the first impactor.

[0018] Figure 3 This is a diagram showing the state of the sample after the second impactor strikes it twice.

[0019] Figure 4 This is a diagram showing the state of the sample after three impacts by the third impactor.

[0020] Figure 5 It is a diagram showing the state of the specimen after three unidirectional impacts by the impactor.

[0021] Figure 6 This is a schematic diagram of the sample velocity time history curve;

[0022] Figure 7 This is a schematic diagram of the time history curve of the sample under load;

[0023] Figure 8 This is a schematic cross-sectional view of the three nested impactors in this application;

[0024] Figure 9 This is a schematic diagram of the overall structure of the gradient confining pressure device of this application;

[0025] Figure 10 This is a schematic cross-sectional view of the gradient confining pressure device of this application;

[0026] Figure 11 This is a schematic diagram of the confining pressure gradient curve of the sample in this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0029] The first aspect of this application provides a simulation device for multiple uniaxial impact load tests under gradient confining pressure, such as... Figure 1-5 , Figure 8-10As shown, the system includes a track 1, a specimen 2, and several impactors 3. The track 1 includes a horizontal section 11, with a ramp section 12 connected to one end of the horizontal section 11. The specimen 2 is located on the horizontal section 11, and a gradient confining pressure device 4 is provided outside the specimen 2 to pressurize the specimen 2. The several impactors 3 serve as power input sources, are released from the ramp section 12 at different heights above the ground, move along the track 1, and sequentially impact the specimen 2 to apply multiple unidirectional impact loads to the specimen 2. The several impactors 3 can be nested sequentially so that the impactor 3 that impacts the specimen 2 later can cross over the impactor 3 that impacted the specimen 2 earlier, thus avoiding collisions between the impactors 3.

[0030] According to the above embodiments, the gradient confining pressure multiple unidirectional impact load test simulation device of this application can apply multiple unidirectional impact loads to the sample in a short time to obtain adjustable impact pulses, and can apply adjustable gradient confining pressure to the sample, realizing that the sample is under gradient confining pressure and multiple unidirectional impact loads are applied to the sample. The test simulation device of this application is easy to operate, has high test flexibility, and can more realistically simulate the underground cavern of engineering blasting test. It can be used to test and simulate the blasting damage effect of multiple blasting loads on the surrounding rock with constantly changing stress state in underground engineering.

[0031] The number of impactors is set according to the test requirements. This application does not limit the number of impactors. For example, this application provides an embodiment with three impactors 3, namely the first impactor 31, the second impactor 32 and the third impactor 33. The three impactors hit the specimen 2 in sequence to apply three unidirectional impact loads to the specimen 2.

[0032] Figure 8 Three cross-sectional structural diagrams are given for nested impactors, as follows: Figure 8 As shown, the multiple impactors in this application are identical in shape and proportionally reduced, allowing them to be nested according to their size. The innermost impactor impacts the sample 2 first, and the outermost impactor impacts the sample 2 last. This ensures that the impactor impacting the sample 2 later can pass over the impactor impacting the sample 2 earlier without colliding with it, thus guaranteeing that the magnitude of each impact load is not affected. This accurately simulates the blasting damage effect of multiple blasting loads on the surrounding rock with constantly changing stress state in underground engineering.

[0033] Specifically, the cross-sectional structure of impactor 3 is as follows: Figure 8As shown, the impactor 3 includes a frame 34 and a hollow part 35 formed by the frame 34. An opening 36 is provided at the bottom of the frame 34. The size of the frames 34 and the opening 36 of several impactors 3 increases sequentially with the increase of the height of the impactor from the ground, and they can be nested and stored in the hollow part 35 through the opening 36.

[0034] Specifically, the first impactor 31 can be nested within the second impactor 32, and the second impactor 32 can be nested within the third impactor 33. The height of the first impactor 31 from the ground is less than the height of the second impactor 32 from the ground, and the height of the second impactor 32 from the ground is less than the height of the third impactor 33 from the ground. When the impactor collides with the sample 2, the first impactor 31 collides with the sample 2 first, then the second impactor 32 crosses over the first impactor 31 and collides with the sample 2, and finally the third impactor 33 crosses over the first impactor 31, the second impactor 32, and the third impactor 33 and collides with the sample 2.

[0035] For example, in a gradient confining pressure multiple uniaxial impact load test simulation device provided in one embodiment, such as Figure 8 and Figure 10 As shown, the opening 36 is close to the track 1, and a pulley 37 is provided in the opening 36. The inclined section 12 and the horizontal section 11 of the track 1 are provided with grooves 13 that correspond one-to-one with the pulley 37. The impactor 3 moves along the groove 13 through the pulley 37.

[0036] According to the above embodiment, by providing a pulley 37 at the bottom of the impactor, the frictional resistance of the impactor running along the track 1 can be reduced.

[0037] For example, in a gradient confining pressure multiple unidirectional impact load test simulation device provided in one embodiment, several impact objects 3 have the same mass, and the radial dimension of the frame 34 of several impact objects 3 increases sequentially and the axial dimension decreases sequentially.

[0038] Specifically, the impactor 3 has an approximately cylindrical structure, and its mass is controlled by the length of the cylinder. For example, by Figure 1 , Figure 8 As shown, the first impactor 31 has the smallest radial dimension of its frame 34 and the longest axial length of its frame 34. The third impactor 33 has the largest radial dimension of its frame 34 and the shortest axial length of its frame 34.

[0039] Furthermore, it should be noted that the mass of each impactor can be adjusted according to the required impact load pulse size and time interval, meaning that the mass of each impactor can also be different.

[0040] For example, in a gradient confining pressure multiple uniaxial impact load test simulation device provided in one embodiment, such as Figure 7-8 As shown, the gradient confining pressure device 4 includes an array of confining pressure sleeves 41 and a confining pressure adjusting device 42. The sample 2 is located inside the confining pressure sleeves 41, and a connecting wing plate 411 is provided on the confining pressure sleeves 41. The confining pressure adjusting device 42 is provided on the connecting wing plate 411 of each array of confining pressure sleeves 41 to adjust the confining pressure of the confining pressure sleeves 41 and make the confining pressure of the array of confining pressure sleeves 41 gradient distributed. The confining pressure adjusting device 42 includes an adjusting bolt 421 and a nut 422. The confining pressure of the confining pressure sleeves 41 is adjusted by adjusting the tightness of the nut 422.

[0041] The number of sets of confining sleeves 41 is determined according to the length of sample 2, for example, Figure 9 An embodiment with four sets of confining sleeves 41 is given, but this application does not limit the number of sets of confining sleeves 41.

[0042] Specifically, such as Figure 9-10 As shown, the confining sleeve 41 includes a "C"-shaped confining plate 412. The connecting wing plate 411 is provided at the joint of the two ends of the confining plate 412. There is a deformation space between the two connecting wing plates 411. The two connecting wing plates 411 are pressurized and fixed by the confining pressure adjusting device 42.

[0043] Specifically, the adjusting bolt 421 passes through the two connecting wing plates 411 at the joint of the "C"-shaped confining pressure plate 412 and is tightened and fixed by the nut 422. Multiple sets of confining pressure sleeves 41 compress the sample 2 to generate confining pressure. When pressurizing, pressure can be applied by turning the nut 422. Different confining pressure states can be achieved by tightening the nut 422 to different degrees on each set of confining pressure sleeves 41.

[0044] For example, in a gradient confining pressure multiple uniaxial impact load test simulation device provided in one embodiment, such as Figure 10 As shown, the gradient confining pressure device 4 also includes a pressure sensor 43, which is provided between the two connecting wing plates 411 of each group of confining pressure sleeves 41 to monitor the confining pressure of each group of confining pressure sleeves 41.

[0045] According to the above embodiment, a pressure sensor 43 is placed between the two connecting flanges 411 of each confining pressure sleeve 41. The pressure sensor 43 is connected to a computer to monitor the confining pressure. The sample 2 is combined with the confining pressure sleeve 41. When installing the confining pressure sleeve 41, the connecting flanges 411 are placed horizontally to ensure that the pressure sensor 43 is placed stably and in good contact. Then, the nut 422 is slowly tightened until the confining pressure measurement value reaches the set state. This process is repeated until all confining pressure sleeves are installed.

[0046] Figure 11 The gradient confining pressure curve applied to sample 2.

[0047] For example, in a gradient confining pressure multiple uniaxial impact load test simulation device provided in one embodiment, such as Figure 10 As shown, a roller 44 is provided at the bottom of the confining sleeve 41, and a groove 14 adapted to the roller 44 is provided on the horizontal section 11 of the track 1. The confining sleeve 41 and the sample 2 inside the confining sleeve 41 move along the groove 14 via the roller 44.

[0048] According to the above embodiment, the movement trajectory of the sample 2 is restricted by the groove 14, so that the impactor 3 corresponds to the center of the sample 2, thereby achieving precise impact.

[0049] For example, in a gradient confining pressure multiple uniaxial impact load test simulation device provided in one embodiment, such as Figure 8 As shown, the sample 2 is a cylindrical rock sample device, which is clamped inside the confining sleeve 41.

[0050] The second aspect of this application provides a method for simulating multiple unidirectional impact load tests under gradient confining pressure, comprising the following steps: S1, placing the specimen 2 equipped with the gradient confining pressure device 4 on the horizontal section 11 of the track 1; S2, placing an impactor 3 of the same mass at different heights above the ground on the inclined section 12 of the track 1, wherein the radial dimension of the frame 34 of the impactors 3 increases with the increase of the height above the ground; S3, simultaneously releasing the impactors 3, which impact the specimen 2 in sequence according to the order of increasing height above the ground, so as to apply multiple unidirectional impact loads to the specimen 2.

[0051] Based on the principles of momentum conservation and impulse theorem, this application can realize the pulse pattern of multiple impacts under gradient confining pressure.

[0052] Specifically, Figure 1 This is a diagram showing the starting position of the simulation method for multiple uniaxial impact load tests under gradient confining pressure as described in this application. Figure 1The first impactor 31, the second impactor 32, the third impactor 33, and the sample 2 are all located on the same track 1, and can move freely on the track 1. The mass of each of the four impactors can be adjusted according to the required impact load pulse size and time interval. In this embodiment, the mass of each of the four impactors is equal, all being m. The first impactor 31, the second impactor 32, and the third impactor 33 are located at different heights from the ground on the slope section 12. Specifically, the height of the first impactor 31 from the ground is H1, the height of the second impactor 32 from the ground is H2, and the height of the third impactor 33 from the ground is H3, where H1 < H2 < H3. The first impactor 31, the second impactor 32, and the third impactor 33 all serve as power input sources. The first impactor 31, the second impactor 32, and the third impactor 33 are hollow cylinders with pulleys 37, and their cross-sectional shapes are as follows... Figure 8 As shown; Specimen 2 is a cylindrical rock sample device with a gradient confining pressure device 4, initially positioned at a distance s from the end of the horizontal section 11 of track 1. At a certain moment, the first impactor 31, the second impactor 32, and the third impactor 33 are released simultaneously, and the first impactor 31, the second impactor 32, and the third impactor 33 move downward along track 1.

[0053] Depend on Figure 2 As shown, if track 1 is made sufficiently smooth to negligible frictional resistance, when the first impactor 31, the second impactor 32, and the third impactor 33 have just reached the horizontal segment 11 of track 1, their velocities are v0, v1, and v2, respectively. When the first impactor 31 collides with the sample 2, according to the law of conservation of momentum, the two objects of the same mass exchange velocities after the collision. That is, after the collision, the first impactor 31 comes to rest, and the sample 2 moves to the right with a velocity v0. At this time, the sample 2, the second impactor 32, and the third impactor 33 all move to the right, and because the velocities of the second impactor 32 and the third impactor 33 are greater, the distance between the three continuously decreases.

[0054] Depend on Figure 3 As shown, after the first impact, time t elapses, and the second impactor 32 passes over the first impactor 31 and collides with the sample 2. After the collision, their velocities are exchanged; the sample 2 moves to the right with velocity v1, and the second impactor 32 moves to the right with velocity v0. After the second impact, time t elapses, and the velocity is changed from... Figure 4 As shown, the third impactor 33 passes over the second impactor 32 and collides with the sample 2, exchanging velocities. At this time, the third impactor 33 moves to the right with velocity v1, and the sample 2 moves to the right with velocity v2, as shown. Figure 5 As shown, the impact process has now ended.

[0055] In the above process, the calculation yields... Impact time interval Initial position of sample 2 By controlling the initial height of the impactor and thus the velocity difference, a millisecond-level micro-delay blasting time interval can be achieved. Furthermore, the number of impacts can be increased by increasing the number of impactors.

[0056] Figure 6 for Figures 1-5 The diagram shows the velocity-time history curves of the sample 2 during the impact process. Segment oa represents the time from the start of the descent of the first impactor 31 to the collision with the sample 2. Segment ab represents the time between the collision of the first impactor 31 and the sample 2 (very short, negligible compared to segments bc and de). Segment bc represents the motion of the sample 2 before the collision with the second impactor 32 (corresponding to time t). Segment cd represents the collision between the second impactor 32 and the sample 2. Segment de represents the motion of the sample 2 before the collision with the third impactor 33 (corresponding to time t). Segment ef represents the collision between the third impactor 33 and the sample 2. Segment fg represents the free motion of the sample 2 after the collision.

[0057] During the collision, according to the momentum theorem, FΔt = mΔv

[0058] but Figure 6 The impact load corresponding to segment ab is The impact load corresponding to segment cd is

[0059]

[0060] Figure 7 for Figure 6 The corresponding impact load and time history curves are shown. Segment ab represents the collision between specimen 2 and the first impactor 31, with a peak load of F1. Segment cd represents the collision between specimen 2 and the second impactor 32, with a peak load of F2. Segment ef represents the collision between specimen 2 and the third impactor 33. Theoretically, the peak load of ef differs from F2 due to the difference in collision time, but considering this time difference to be small, the peak load is still considered to be F2. Similarly, when the number of impactors increases, the peak load of subsequent collisions is always F2.

[0061] Although the embodiments of this application have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this application. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this application is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A simulation device for multiple unidirectional impact load tests under gradient confining pressure, characterized in that, include: The track includes a horizontal section, at one end of which a ramp section is connected; The specimen is located in the horizontal section, and a gradient confining pressure device is provided outside the specimen to pressurize the specimen; Several impactors, acting as power input sources, are released from different heights above the ground on the slope section and move along the track, sequentially impacting the specimen to apply multiple unidirectional impact loads to the specimen. Among them, several impactors can be nested in sequence so that the impactor that impacts the sample later can pass over the impactor that impacts the sample earlier, so as to avoid the impactors colliding with each other. The gradient confining pressure device includes: An array of confining sleeves, wherein the sample is located inside the confining sleeves, and a connecting wing plate is provided on the confining sleeves; A confining pressure adjusting device is provided on the connecting wing plate of each group of confining pressure sleeves to adjust the confining pressure of the confining pressure sleeves and make the confining pressure of the group of confining pressure sleeves gradient distributed. The confining pressure adjusting device includes adjusting bolts and nuts, and the confining pressure of the confining pressure sleeves is adjusted by adjusting the tightness of the nuts.

2. The simulation device for multiple unidirectional impact load tests under gradient confining pressure according to claim 1, characterized in that, The impactor includes a frame and a hollow part formed by the frame. An opening is provided at the bottom of the frame. The size of the frames and the openings of several impactors increases sequentially with the height of the impactor from the ground. They can be nested and stored in the hollow part through the openings.

3. The simulation device for multiple unidirectional impact load tests under gradient confining pressure according to claim 2, characterized in that, The opening is close to the track, and a pulley is provided in the opening. The inclined section and the horizontal section of the track are provided with grooves corresponding to the pulleys. The impactor moves along the grooves through the pulleys.

4. The simulation device for multiple unidirectional impact load tests under gradient confining pressure according to claim 3, characterized in that, The impactors have the same mass, and the radial dimensions of the frames of the impactors increase sequentially while the axial dimensions decrease sequentially.

5. The simulation device for multiple unidirectional impact load tests under gradient confining pressure according to claim 1, characterized in that, The confining sleeve includes a "C"-shaped confining plate, and the connecting wing plate is provided at the joint of the two ends of the confining plate. There is a deformation space between the two connecting wing plates, and the two connecting wing plates are pressurized and fixed by the confining pressure adjustment device.

6. The simulation device for multiple unidirectional impact load tests under gradient confining pressure according to claim 5, characterized in that, The gradient confining pressure device also includes a pressure sensor, which is provided between the two connecting wing plates of each group of confining pressure sleeves to monitor the confining pressure of each group of confining pressure sleeves.

7. The simulation device for multiple unidirectional impact load tests under gradient confining pressure according to claim 6, characterized in that, A roller is provided at the bottom of the confining sleeve, and a groove adapted to the roller is provided on the horizontal section of the track. The confining sleeve and the sample inside the confining sleeve move along the groove via the roller.

8. The simulation device for multiple unidirectional impact load tests under gradient confining pressure according to claim 7, characterized in that, The sample is a cylindrical rock sample device, which is clamped inside the confining sleeve.

Images