CN114279841A - True triaxial test device and method integrating high-speed camera shooting and real-time shooting - Google Patents
True triaxial test device and method integrating high-speed camera shooting and real-time shooting Download PDFInfo
- Publication number
- CN114279841A CN114279841A CN202111611225.7A CN202111611225A CN114279841A CN 114279841 A CN114279841 A CN 114279841A CN 202111611225 A CN202111611225 A CN 202111611225A CN 114279841 A CN114279841 A CN 114279841A
- Authority
- CN
- China
- Prior art keywords
- real
- shooting
- true triaxial
- light source
- pressure head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000011435 rock Substances 0.000 claims abstract description 90
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000003825 pressing Methods 0.000 claims description 64
- 238000010998 test method Methods 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 abstract description 6
- 238000011160 research Methods 0.000 abstract description 5
- 239000002689 soil Substances 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000002591 computed tomography Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Images
Abstract
A true triaxial test device and method integrating high-speed camera shooting and real-time shooting belong to the technical field of rock fracture observation in rock-soil true triaxial tests. Fuse real triaxial test device of high-speed camera shooting in real time, including the inside rock sample that is provided with of interlock formula linkage anchor clamps, real triaxial loading pressure head subassembly, high-speed camera system and area light source control system, real triaxial loading pressure head subassembly is used for exerting real three-dimensional stress to the rock sample, and high-speed camera system is arranged in the image of real triaxial test in-process rock sample of real-time shooting, and area light source control system is used for guaranteeing the clear shooting of rock sample image. The true triaxial test device and the method integrating high-speed camera shooting and real-time shooting can directly observe and research the fracture evolution process of the rock in the true triaxial test, and obtain the crack initiation, expansion and evolution rules in the whole process of the true triaxial test in real time.
Description
Technical Field
The invention relates to the technical field of rock fracture observation in rock-soil true triaxial test, in particular to a true triaxial test device and method integrating high-speed camera shooting and real-time shooting.
Background
The deep engineering rock mass is in a true three-dimensional stress state (sigma)1＞σ2＞σ3) The cracks of the rock under the action of the true three-dimensional stress are mostly parallel to the middle main stress, so that the deformation failure mechanism and the crack fracture evolution rule of the rock under the true three-dimensional stress state can be revealed by shooting the surface change of the rock sample acted by the middle main stress.
At present, many scholars add CT real-time scanning units on single-axis and conventional triaxial test devices for studying the fracture process of rocks. For an individual true triaxial test system for realizing real-time CT scanning of rocks, the cost is huge, and in the test process, the test needs to be suspended for CT scanning, so that the normal operation of the test is influenced, and real-time and continuous scanning cannot be realized.
Moreover, at present, there is no precedent that the rock true triaxial testing machine is provided with a high-speed camera, so that the research on the crack evolution rule under the action of true triaxial stress is mostly based on the calculation, and the evidence of direct observation is lacked.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a true triaxial test device and a true triaxial test method integrating high-speed camera shooting and real-time shooting, which can directly observe and research the fracture evolution process of rocks in a true triaxial test and obtain the crack initiation, expansion and evolution rules in the whole process of the true triaxial test in real time.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a true triaxial test device integrating high-speed camera shooting and real-time shooting comprises an interlocking type linkage clamp, a true triaxial loading pressure head assembly, a high-speed camera shooting system and a surface light source control system;
a rock sample is arranged in the interlocking type linkage clamp;
the true triaxial loading pressure head assembly is arranged outside the interlocking type linkage clamp and is used for applying true triaxial stress to a rock sample;
the high-speed camera system comprises an endoscope and a special camera which are arranged above the mutually buckled linkage clamp and are sequentially connected, and is used for shooting images of the rock sample in the true triaxial test process in real time;
the surface light source control system comprises at least two surface light sources arranged above the mutually buckled linkage clamp and is used for ensuring the clear shooting of rock sample images.
Furthermore, the mutually buckled linkage clamp comprises an upper pressing block, a lower pressing block, a left pressing block, a right pressing block, a front pressing block and a rear pressing block which are arranged on six surfaces of the rock sample; every two adjacent press blocks in the lower press block, the left press block, the right press block, the front press block and the rear press block are connected into an interlocking assembly in a sliding mode; the upper pressing block is placed at the top of the interlocking type component.
Furthermore, the upper pressing block is of a transparent structure.
Furthermore, the true triaxial loading pressure head assembly comprises an upper loading pressure head, a lower loading pressure head, a left loading pressure head, a right loading pressure head, a front loading pressure head and a rear loading pressure head which are arranged on six surfaces of the interlocking type linkage clamp; the lower part of the upper loading pressure head is provided with a straight wall arch-shaped opening, and the upper part of the upper loading pressure head is provided with an endoscope mounting hole for mounting an endoscope.
Further, the area light source is provided with two, is first area light source and second surface light source respectively, first area light source and second surface light source set up respectively in the both sides of the straight wall arch opening of upper loading pressure head for carry out the light filling to the rock sample, realize shooing clearly.
Furthermore, the first surface light source and the second surface light source are both connected with a surface light source controller, and the surface light source controller is used for controlling the on-off and the brightness of the first surface light source and the second surface light source.
Furthermore, the special camera is connected with an upper computer, the special camera adopts a high-speed camera, and the rock sample image shot by the high-speed camera in real time is sent to the upper computer for display and storage, so that the rock sample high-speed fracture process can be observed and recorded in real time.
Preferably, the angle of view of the endoscope is 45 °, and the tip end of the endoscope is disposed parallel to the upper surface of the rock sample.
A true triaxial test method fusing high-speed camera shooting and real-time shooting is adopted, and the true triaxial test device fusing high-speed camera shooting and real-time shooting comprises the following steps:
s1, placing the rock sample in the interlocking type linkage clamp, then placing the interlocking type linkage clamp with the rock sample on a rigid true triaxial test system, and applying pretightening force;
s2, placing a first surface light source and a second surface light source on two sides of the straight wall arch opening of the upper loading pressure head respectively, and inserting an endoscope connected with a special camera into the endoscope mounting hole of the upper loading pressure head;
and S3, carrying out true triaxial test on the rock sample through the rigid true triaxial test system, shooting the image of the rock sample in real time through a professional camera in the test process, and sending the image to an upper computer for displaying and storing until the test is finished.
The invention has the beneficial effects that:
1) the invention is provided with the high-speed camera system on the rigid true triaxial test system, can obtain real-time and continuous images of the deformation and fracture process of the rock sample in the whole process of the true triaxial test in real time, can be applied to the observation and research of the rock fracture evolution in the rock engineering true triaxial test, and can obtain sigma in the whole process of the true triaxial test in real time2And (3) on the action surface, the initiation, expansion and evolution rules of rock fractures.
2) The rock sample fracture evolution method based on the true triaxial test solves the problem that the rock sample fracture evolution law cannot be directly obtained in the true triaxial test process, overcomes the defect that the rock failure mode can be observed only by unloading and taking the rock sample from the true triaxial test bed in the traditional test, realizes the real-time cooperation of the rock true triaxial and the high-speed camera shooting in the whole process, and has important significance for researching the change of the rock structure in the true triaxial stress state, explaining the macroscopic strength and the deformation mechanism, and revealing the rock crack real-time expansion and fracture evolution law.
Additional features and advantages of the invention will be set forth in part in the detailed description which follows.
Drawings
Fig. 1 is a schematic structural diagram of a true triaxial test apparatus integrating high-speed camera shooting and real-time shooting according to an embodiment of the present invention;
FIG. 2 is an exploded view of an interlocking linkage clamp provided by an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an upper loading ram provided by an embodiment of the present invention;
FIG. 4 is a schematic view of a dedicated camera provided by an embodiment of the present invention in connection with an endoscope;
FIG. 5 is a longitudinal sectional view of a high-speed imaging system provided by an embodiment of the invention;
FIG. 6 is a stress-time relationship for a rock sample under true triaxial loading provided by an embodiment of the present invention;
fig. 7 is a gray scale diagram of a rock sample photographed by a high-speed camera at a critical moment in a true triaxial test process according to an embodiment of the present invention.
Reference numerals in the drawings of the specification include:
1-special camera, 2-endoscope, 3-first area light source, 4-second area light source, 5-area light source controller, 6-upper computer, 7-upper loading pressure head, 7-1-endoscope mounting hole, 7-2-straight wall arch-shaped gap, 8-lower loading pressure head, 9-left loading pressure head, 10-right loading pressure head, 11-front loading pressure head, 12-rear loading pressure head, 13-upper pressing block, 14-lower pressing block, 15-left pressing block, 16-right pressing block, 17-front pressing block, 18-rear pressing block and 19-rock sample.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In order to solve the problems in the prior art, as shown in fig. 1 to 5, the true triaxial test device integrating high-speed camera shooting and real-time shooting comprises an interlocking type linkage clamp, a true triaxial loading pressure head assembly, a high-speed camera shooting system and a surface light source control system;
a rock sample 19 is arranged inside the interlocking type linkage clamp;
the true triaxial loading pressure head assembly is arranged outside the interlocking type linkage clamp and is used for applying true triaxial stress to the rock sample 19;
the high-speed camera system comprises an endoscope 2 and a special camera 1 which are arranged above the mutually buckled linkage clamp and are sequentially connected, and is used for shooting images of the rock sample 19 in the true triaxial test process in real time so as to obtain the initiation, expansion and evolution rules of cracks of the rock sample 19;
the surface light source control system comprises at least two surface light sources arranged above the interlocking type linkage clamp and is used for ensuring the clear shooting of the rock sample 19 image.
As shown in fig. 1 and 2, the interlocking type linkage clamp comprises an upper pressing block 13, a lower pressing block 14, a left pressing block 15, a right pressing block 16, a front pressing block 17 and a rear pressing block 18 which are arranged on six surfaces of a rock sample 19; every two adjacent press blocks in the lower press block 14, the left press block 15, the right press block 16, the front press block 17 and the rear press block 18 are connected into an interlocking component in a sliding way; the upper press block 13 is placed on top of the interlocking assembly. In this embodiment, the rock sample 19 is a rectangular parallelepiped structure, the upper pressing block 13, the lower pressing block 14, the left pressing block 15, the right pressing block 16, the front pressing block 17 and the rear pressing block 18 are correspondingly disposed on the upper, lower, left, right, front and rear side surfaces of the rock sample 19, the upper pressing block 13, the lower pressing block 14, the left pressing block 15, the right pressing block 16, the front pressing block 17 and the rear pressing block 18 are all flat rectangular parallelepiped structures, specifically, the sliding groove of the rear pressing block 18 is slidably connected with the sliding rail of the right pressing block 16, the sliding groove of the right pressing block 16 is slidably connected with the sliding rail of the lower pressing block 14, the sliding groove of the front pressing block 17 is slidably connected with the sliding rail of the left pressing block 15, so as to realize the sliding connection among the lower pressing block 14, the left pressing block 15, the right pressing block 16, the front pressing block 17 and the rear pressing block 18 into an assembly, the lower pressing block 14, the left pressing block 15, the right pressing block 16, the front pressing block 17 and the rear pressing block 18 are all rigid cushion blocks, and the upper pressing block 13 form an interlocking cavity for placing the rock sample 19, so that a stress blank angle is avoided in the loading process.
In the invention, the upper pressing block 13 is of a transparent structure, specifically, the upper pressing block 13 of the interlocking type linkage clamp is made of a transparent material with high strength and high rigidity, such as ultra-high strength toughened glass, and is positioned below the upper loading pressing head 7 to uniformly transmit pressure to the surface of the rock sample 19, and meanwhile, the special camera 1 can shoot the upper surface fracture evolution of the rock sample 19 in the whole test process by utilizing the transparency of the upper pressing block.
As shown in fig. 1, 3 and 4, the true triaxial loading ram assembly includes an upper loading ram 7, a lower loading ram 8, a left loading ram 9, a right loading ram 10, a front loading ram 11 and a rear loading ram 12 disposed on six surfaces of the interlocking fixture; the lower part of the upper loading pressure head 7 is provided with a straight wall arch-shaped gap 7-2, and the upper part of the upper loading pressure head 7 is provided with an inner openingA sight glass mounting hole 7-1 for mounting the sight glass 2. In this embodiment, the upper loading indenter 7, the lower loading indenter 8, the left loading indenter 9, the right loading indenter 10, the front loading indenter 11, and the rear loading indenter 12 are correspondingly disposed on the upper, lower, left, right, front, and rear sides of the interlocking type linkage jig, and the six loading indenters are all matched with the rigid true triaxial test system, so that the rigid true triaxial test system can independently apply true triaxial stress (σ) to the rock sample 19 (the σ true triaxial test system applies true triaxial stress independently1>σ2>σ3) Specifically, the upper part of an upper loading pressure head 7 is connected with an actuator of a rigid true triaxial test system, the lower part of the upper loading pressure head 7 is contacted with a transparent upper pressing block 13, the lower part of the upper pressing block 13 is contacted with a rock sample 19, the pressure provided by the rigid true triaxial test system is uniformly transmitted to the rock sample 19, a straight wall arch-shaped notch 7-2 arranged below the upper loading pressure head 7 is used for allowing light emitted by a first surface light source 3 and a second surface light source 4 to penetrate through the upper pressing block 13 and directly irradiate to the surface of the rock sample 19, an endoscope mounting hole 7-1 forming an angle theta with a horizontal plane is arranged at the top end of the straight wall arch-shaped notch 7-2 of the upper loading pressure head 7 and is used for placing and fixing a rod body of the endoscope 2 and a special camera 1 connected with the endoscope 2, the angle theta is less than or equal to 45 degrees, and the included angle between the endoscope mounting hole 7-1 and the horizontal plane is the same as the included angle between the endoscope 2 and the upper surface of the rock sample 19, theta is preferably 45 degrees, the completeness of the shooting range is guaranteed, after the lens end of the endoscope 2 is inserted into the upper loading pressure head 7, the special camera 1 can shoot the fracture evolution of the surface of the rock sample 19, and the upper loading pressure head 7 is installed on the rigid true triaxial test system sigma2In one direction, the lower loading pressure head 8, the left loading pressure head 9, the right loading pressure head 10, the front loading pressure head 11 and the rear loading pressure head 12 are all common square rigid pressure heads, are arranged in the residual loading direction of the rigid true triaxial test system and are respectively connected with the rest actuators of the rigid true triaxial test system to realize independent application of true triaxial stress (sigma)1>σ2>σ3)。
As a preferred embodiment, the number of the surface light sources is two, namely a first surface light source 3 and a second surface light source 4, the first surface light source 3 and the second surface light source 4 are respectively arranged on two sides of a straight-wall arched opening 7-2 of an upper loading pressure head 7 and used for supplementing light to a rock sample 19 and achieving clear shooting.
In the invention, the first surface light source 3 and the second surface light source 4 are both connected with the surface light source controller 5, and the surface light source controller 5 is used for controlling the on-off and the brightness of the first surface light source 3 and the second surface light source 4.
As shown in figure 5, the special camera 1 is connected with the upper computer 6, the special camera 1 adopts a high-speed camera, images of the rock sample 19 shot by the high-speed camera in real time are sent to the upper computer 6 to be displayed and stored, and the high-speed fracture process of the rock sample 19 is observed and recorded in real time. In the embodiment, the high-speed camera is fixedly arranged in the rigid true triaxial test system, the high-speed camera is connected with the endoscope 2 by an interface, the upper computer 6 is provided with control software matched with the high-speed camera and used for setting shooting parameters of the high-speed camera, specifically, the tail end of the endoscope 2 extends out of the upper loading pressure head 7 to be connected with the special camera 1, and the lens end of the endoscope 2 extends into the endoscope mounting hole 7-1 of the upper loading pressure head 7, because the high-speed camera has short exposure time, the requirement on the light transmission capability of the lens is high, the customized endoscope 2 adopts a 10mm large-aperture high-brightness light transmission lens to ensure that the field angle is 45 degrees under the condition of no distortion, the light transmission capability is superior to that of a conventional endoscope lens, a high-quality light transmission imaging effect is provided for the high-speed camera, superior test images are obtained, and reliable image data can be provided for experiments to the maximum extent, the rock sample 19 is photographed at a long time, at a high speed and at a high resolution, and is stored in the upper computer 6 in real time, preferably, the high-speed camera system adopts an optical fiber high-speed transmission mode to transmit data, and the ultra-large data volume of the high-speed, high-resolution and long-time high-speed image can be stored in real time without compression and loss on one upper computer 6.
As a preferred embodiment, the angle of view of the endoscope 2 is 45 ° to achieve a large shooting field of view; the lens end of the endoscope 2 is arranged in parallel with the upper surface of the rock sample 19, namely, the included angle between the endoscope 2 and the upper surface of the rock sample 19 is 45 degrees, so that the special camera 1 and the endoscope 2 can obliquely extend out of the upper loading pressure head 7 to capture the whole surface of the rock sample 19, and the complete shooting of the surface image of the rock sample 19 is realized. In this embodiment, the structure of the endoscope 2 is the same as that of a conventional endoscope, a plurality of groups of optical lens lenses are adopted, and the endoscope is connected with a high-speed camera through an optical interface to form a high-precision nondestructive high-speed imaging detection instrument, and the insertion tube structure of the endoscope 2 is as follows: special stainless steel multilayer protective pipe; pipe diameter: 10 mm; the observation direction is as follows: 45 degrees; length: 300 mm; providing an optical C-type interface; the end of the lens is a 10mm large-diameter high-brightness light-transmitting lens, the structural design of the imaging objective lens with a large view field, a long depth of field and a small diameter is adopted, the image is clear, the stainless steel is inserted into the outer tube, the anti-abrasion and anti-fouling effects are more suitable for special environments, and the lens is durable.
The invention also provides a true triaxial test method fusing high-speed camera shooting and real-time shooting, and the true triaxial test device fusing high-speed camera shooting and real-time shooting comprises the following steps:
s1, placing the rock sample 19 in an interlocking type linkage clamp, then placing the interlocking type linkage clamp with the rock sample 19 on a rigid true triaxial test system, and applying pretightening force; in this example, the dimensions of the rock sample 19 are 50mm × 50mm × 100 mm;
s2, respectively placing a first surface light source 3 and a second surface light source 4 on two sides of a straight wall arch opening 7-2 of an upper loading pressure head 7, inserting an endoscope 2 connected with a special camera 1 into an endoscope mounting hole 7-1 of the upper loading pressure head 7, specifically, switching on a power supply of a high-speed camera system, respectively connecting the first surface light source 3 and the second surface light source 4 with a surface light source controller 5, placing the first surface light source 3 and the second surface light source 4 on the left side and the right side of the straight wall arch opening 7-2 of the upper loading pressure head 7, adjusting the surface light source controller 5 to enable shot images to be clear, and adjusting the special camera 1 to a preset shooting frame rate through control software matched with the high-speed camera in an upper computer 6;
and S3, carrying out true triaxial test on the rock sample 19 through the rigid true triaxial test system, shooting the image of the rock sample 19 in real time through a professional camera in the test process, and sending the image to the upper computer 6 for display and storage until the test is finished.
In actual use, after step S1, the required sensors can be connected according to the test requirements and adjusted to the appropriate values to facilitate environmental control or data collection during the test. In the step S3, the high-speed camera system is used to continuously shoot the rock sample 19 in real time in the whole test process until the test is finished, and since the crack initiation and propagation processes of the rock sample 19 are very rapid, the shooting frame rate of the special camera 1 can be adjusted at any time in the test process to achieve the best shooting effect in order to accurately shoot the change of the crack; for example, when the peak value of the force-deformation curve is approached, the shooting frame rate is increased; and in the residual stage, ending the test, closing the high-speed camera system, unloading the stress and taking out the sample. In addition, reference is made to the prior art with regard to other settings of the true triaxial test.
In subsequent research, according to the shot images, the deformation and fracture state of the rock sample 19 at any moment or in any stress state can be obtained, the deformation and fracture state is used for analyzing the initiation, expansion and evolution rules of rock fractures under the action of true triaxial stress, and the change of a strain field can be analyzed by combining a Digital Image Correlation (DIC).
As shown in fig. 6 and 7, under true triaxial loading, from a stress-time relationship curve, 6 critical moments (e.g., points a, b, c, d, e, and f in fig. 6) are selected for explaining the real-time crack propagation and fracture evolution law of the rock sample 19:
the point a in FIG. 6, corresponding to FIG. 7 (a), shows an image of the rock sample 19 prior to loading, with the distribution of the gravel and cement in the rock sample 19 clearly visible;
at the time point b in fig. 6, the image obtained by 1849.08s is shown, corresponding to the time point (b) in fig. 7, and no obvious crack is observed in the image, but the lower gravel boundary of the image is blurred compared with the image before loading;
the time point c in fig. 6 corresponds to the image captured at 2475.41s shown in fig. 7 (c), and this corresponds to the peak stress, and the partial micro-crack appears below the middle of the image;
the time point d in fig. 6 corresponds to the image captured in fig. 7 (d), which shows that the micro cracks gradually expand and extend some new micro cracks, and at the same time, cracks formed along the gravel boundary also appear in the upper left of the image, and at this time, the cracks are already obvious;
at the time point e in fig. 6, which corresponds to the image captured in fig. 7 (e), the 4400s are shown, and a large number of micro-cracks rapidly gather and expand and gradually penetrate to form macro-cracks;
at the time point f in fig. 6, which corresponds to (f) in fig. 7, the image captured at 5082.6s shows that the crack width is further increased than that of the image at 4400s, and the macro cracks and the micro cracks are densely distributed below the image, resulting in total failure.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A true triaxial test device integrating high-speed camera shooting and real-time shooting is characterized by comprising an interlocking type linkage clamp, a true triaxial loading pressure head assembly, a high-speed camera shooting system and a surface light source control system;
a rock sample is arranged in the interlocking type linkage clamp;
the true triaxial loading pressure head assembly is arranged outside the interlocking type linkage clamp and is used for applying true triaxial stress to a rock sample;
the high-speed camera system comprises an endoscope and a special camera which are arranged above the mutually buckled linkage clamp and are sequentially connected, and is used for shooting images of the rock sample in the true triaxial test process in real time;
the surface light source control system comprises at least two surface light sources arranged above the mutually buckled linkage clamp and is used for ensuring the clear shooting of rock sample images.
2. The true triaxial test device integrating high-speed camera shooting and real-time shooting according to claim 1, wherein the interlocking type linkage clamp comprises an upper pressing block, a lower pressing block, a left pressing block, a right pressing block, a front pressing block and a rear pressing block which are arranged on six surfaces of a rock sample; every two adjacent press blocks in the lower press block, the left press block, the right press block, the front press block and the rear press block are connected into an interlocking assembly in a sliding mode; the upper pressing block is placed at the top of the interlocking type component.
3. The true triaxial test device integrating high-speed camera shooting and real-time shooting according to claim 2, wherein the upper pressing block is of a transparent structure.
4. The true triaxial test device integrating high-speed camera shooting and real-time shooting according to claim 1, wherein the true triaxial loading pressure head assembly comprises an upper loading pressure head, a lower loading pressure head, a left loading pressure head, a right loading pressure head, a front loading pressure head and a rear loading pressure head which are arranged on six surfaces of an interlocking type linkage clamp; the lower part of the upper loading pressure head is provided with a straight wall arch-shaped opening, and the upper part of the upper loading pressure head is provided with an endoscope mounting hole for mounting an endoscope.
5. The device for testing true triaxial tests, which integrates high-speed camera shooting and real-time shooting, according to claim 4, wherein two surface light sources are provided, namely a first surface light source and a second surface light source, and the first surface light source and the second surface light source are respectively provided on two sides of the arched opening of the upper loading pressure head straight wall.
6. The true triaxial test device integrating high-speed camera shooting and real-time shooting as claimed in claim 5, wherein the first surface light source and the second surface light source are both connected with a surface light source controller, and the surface light source controller is used for controlling the on-off and brightness of the first surface light source and the second surface light source.
7. The true triaxial test device integrating high-speed camera shooting and real-time shooting is characterized in that the special camera is connected with an upper computer, the special camera adopts a high-speed camera, and rock sample images shot by the high-speed camera in real time are sent to the upper computer to be displayed and stored.
8. The true triaxial test apparatus integrating high-speed image pickup and real-time image pickup according to claim 1, wherein the angle of view of the endoscope is 45 °, and the lens end of the endoscope is disposed parallel to the upper surface of the rock sample.
9. A true triaxial test method for fusing high-speed camera shooting and real-time shooting, which adopts the true triaxial test device for fusing high-speed camera shooting and real-time shooting as claimed in any one of claims 1 to 8, is characterized by comprising the following steps:
s1, placing the rock sample in the interlocking type linkage clamp, then placing the interlocking type linkage clamp with the rock sample on a rigid true triaxial test system, and applying pretightening force;
s2, placing a first surface light source and a second surface light source on two sides of the straight wall arch opening of the upper loading pressure head respectively, and inserting an endoscope connected with a special camera into the endoscope mounting hole of the upper loading pressure head;
and S3, carrying out true triaxial test on the rock sample through the rigid true triaxial test system, shooting the image of the rock sample in real time through a professional camera in the test process, and sending the image to an upper computer for displaying and storing until the test is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111611225.7A CN114279841A (en) | 2021-12-27 | 2021-12-27 | True triaxial test device and method integrating high-speed camera shooting and real-time shooting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111611225.7A CN114279841A (en) | 2021-12-27 | 2021-12-27 | True triaxial test device and method integrating high-speed camera shooting and real-time shooting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114279841A true CN114279841A (en) | 2022-04-05 |
Family
ID=80876217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111611225.7A Pending CN114279841A (en) | 2021-12-27 | 2021-12-27 | True triaxial test device and method integrating high-speed camera shooting and real-time shooting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114279841A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120082512A (en) * | 2011-01-14 | 2012-07-24 | (주)백경지앤씨 | Geo endoscope system |
| CN105842080A (en) * | 2016-03-17 | 2016-08-10 | 浙江大学 | Mechanical testing system for material with composite load in induction heating mode |
| CN107907402A (en) * | 2017-11-09 | 2018-04-13 | 北京科技大学 | Chamber palisades are crisp to cut transition type crash simulation instrument |
| CN108918284A (en) * | 2018-07-25 | 2018-11-30 | 重庆大学 | A kind of visualization true triaxial experimental provision |
| CN111638134A (en) * | 2020-08-03 | 2020-09-08 | 中南大学 | Rock true triaxial test system and full-field strain monitoring device and monitoring method thereof |
| CN111929221A (en) * | 2020-09-11 | 2020-11-13 | 中南大学 | Deep surrounding rock seepage stability analysis device and method under strong power disturbance |
| CN112033793A (en) * | 2020-09-10 | 2020-12-04 | 中南大学 | Test device and method for observing initiation evolution of rock hydraulic fracturing crack |
| CN112378808A (en) * | 2020-12-04 | 2021-02-19 | 东北大学 | Microwave intelligent loading fracturing hard rock test system based on true triaxial stress |
| CN113702185A (en) * | 2021-09-24 | 2021-11-26 | 广西大学 | Fixture and observation method for visual quantitative research on disturbance fracture of hard rock under true triaxial |
-
2021
- 2021-12-27 CN CN202111611225.7A patent/CN114279841A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120082512A (en) * | 2011-01-14 | 2012-07-24 | (주)백경지앤씨 | Geo endoscope system |
| CN105842080A (en) * | 2016-03-17 | 2016-08-10 | 浙江大学 | Mechanical testing system for material with composite load in induction heating mode |
| CN107907402A (en) * | 2017-11-09 | 2018-04-13 | 北京科技大学 | Chamber palisades are crisp to cut transition type crash simulation instrument |
| CN108918284A (en) * | 2018-07-25 | 2018-11-30 | 重庆大学 | A kind of visualization true triaxial experimental provision |
| CN111638134A (en) * | 2020-08-03 | 2020-09-08 | 中南大学 | Rock true triaxial test system and full-field strain monitoring device and monitoring method thereof |
| CN112033793A (en) * | 2020-09-10 | 2020-12-04 | 中南大学 | Test device and method for observing initiation evolution of rock hydraulic fracturing crack |
| CN111929221A (en) * | 2020-09-11 | 2020-11-13 | 中南大学 | Deep surrounding rock seepage stability analysis device and method under strong power disturbance |
| CN112378808A (en) * | 2020-12-04 | 2021-02-19 | 东北大学 | Microwave intelligent loading fracturing hard rock test system based on true triaxial stress |
| CN113702185A (en) * | 2021-09-24 | 2021-11-26 | 广西大学 | Fixture and observation method for visual quantitative research on disturbance fracture of hard rock under true triaxial |
Non-Patent Citations (3)
| Title |
|---|
| BING PAN: "Dgital image correlation for surface deformation measurement: historical developments, recent advances and future goals", 《MEASUREMENT SCIENCE AND TECHNOLOGY》, vol. 29, 31 December 2018 (2018-12-31), pages 082001 * |
| JUN ZHAO 等: "Study on Time-Dependent Fracturing Behaviour for Three Different Hard Rock Under High True Triaxial Stress", 《ROCK MECHANICS AND ROCK ENGINEERING》, vol. 54, 4 January 2021 (2021-01-04), pages 1239 - 1255, XP037405251, DOI: 10.1007/s00603-020-02327-5 * |
| 苏国韶 等: "低频周期扰动荷载与静载联合作用下岩爆过程的真三轴试验研究", 《岩石力学与工程学报》, vol. 35, no. 7, 31 December 2016 (2016-12-31), pages 1309 - 1322 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Denoual et al. | Visualization of the damage evolution in impacted silicon carbide ceramics | |
| CN104913974B (en) | The biaxial stretch-formed fatigue test system of material Micro Mechanical Properties and its method of testing | |
| CN106525577A (en) | Device and method for testing dynamic mechanical properties of materials under tensile/shear combined loading | |
| CN109163982B (en) | Thermal environment bidirectional loading test equipment and test method | |
| CN103487315A (en) | Testing device for mechanical property of material | |
| CN105651598A (en) | High-speed strain testing apparatus and high-speed strain testing method based on line scan camera | |
| CN108982264B (en) | P-y curve measuring device based on soil body shear band development | |
| WO2020134580A1 (en) | Method of using true-triaxial hopkinson bar to test dynamic damage to solid and ultrasonic propagation | |
| CN103698342A (en) | Laser scattering-based optical-fiber prefabricated rod defect detection method | |
| US6301956B1 (en) | Hardness tester | |
| CN105424495A (en) | Device and method for testing plane stress state of coal rock sheet under thermal-mechanical coupling condition | |
| CN210665329U (en) | Non-contact crack opening displacement measuring device for bending fracture test | |
| CN103808567A (en) | Mechanical property testing device and mechanical property testing method for soldered joint | |
| CN108195662A (en) | Mechanical behavior under high temperature test system and method based on laser double-surface irradiated heat | |
| CN104777039A (en) | Experimental device for research on rock high temperature thermal rupture under stress effect | |
| CN114279841A (en) | True triaxial test device and method integrating high-speed camera shooting and real-time shooting | |
| CN102323279B (en) | X-ray tomography-based in-situ loading device | |
| CN108717063B (en) | Quantitative measurement method for concrete damage | |
| CN106525584B (en) | A kind of preparation method for in-situ mechanical loading tool under transmission electron microscope | |
| CN113218750A (en) | Method and device for measuring crack propagation speed of rock fracture | |
| WO2023213040A1 (en) | Curved pressure-resistant shell equivalent simulation testing apparatus and testing method | |
| CN104483317A (en) | High-throughput digital full-field metallographic in-situ statistic characterization analyzer and analysis method | |
| CN109596647B (en) | Method for neutron scattering experiment | |
| CN110608956A (en) | System and method for measuring dynamic Poisson's ratio of brittle material | |
| CN109342185A (en) | A kind of rock long-term creep acts on lower micro-measure automatic tracking system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |