CN110987644A - Rigid-flexible combined sliding true triaxial loading device for sealing sample by applying pressure through air cylinder - Google Patents
Rigid-flexible combined sliding true triaxial loading device for sealing sample by applying pressure through air cylinder Download PDFInfo
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- CN110987644A CN110987644A CN201911383436.2A CN201911383436A CN110987644A CN 110987644 A CN110987644 A CN 110987644A CN 201911383436 A CN201911383436 A CN 201911383436A CN 110987644 A CN110987644 A CN 110987644A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention provides a rigid-flexible combined sliding true triaxial loading device for sealing a sample by applying pressure through an air cylinder, which comprises: the rigid sliding loading plates in four directions are overlapped with each other to form a rectangular central accommodating space; a loading piston for applying a load to the rigid sliding loading plate, the loading piston being slidable relative to each other in a horizontal direction and a vertical direction; the rock soil sample and the rigid sliding loading plate are wrapped by the rubber film; the rigid sliding loading plate and the loading piston are in sliding connection through a sliding block; the thread sealer is used for sealing the rubber film; the cylinder sealer is pressed by a cylinder to tightly squeeze a gap between the cylinder sealer and the rigid sliding loading plate; therefore, the rigid sliding loading plate and the rock soil sample are wholly sealed in the accommodating space. The invention avoids the air leakage phenomenon caused by manual sealing, can realize the closing and the unloading of the sealer by controlling the pressure of the air cylinder, and is convenient for the disassembly of a test instrument and a rock soil sample.
Description
Technical Field
The invention relates to a loading device in geotechnical mechanics, which is used for applying load during testing and testing the stress-strain intensity characteristic of a geotechnical sample under the action of three-dimensional stress, in particular to a rigid-flexible composite true triaxial loading device for sealing a rubber film by using a thread sealer and a cylinder sealer.
Background
Three-dimensional analysis problems are often encountered in geotechnical engineering. The design and experimental study of true triaxial apparatus has been an active and challenging research area. The stress-strain intensity characteristic of rock soil is generally measured by adopting a true triaxial system. True triaxial testing means that cubic geotechnical specimens are subjected to uniform pressure (or strain) in three directions (or three axial directions). The true triaxial test has important significance for measuring the stress-strain performance of rock and soil under the load action of three main directions.
The existing loading device for true triaxial test can be divided into the following 3 types: (1) a rigid loading mode; (2) a flexible loading mode; (3) mixed boundary loading mode. The most widely used method is a mixed boundary loading method which solves many limitations in pure rigid and pure flexible loading, but the system also has some defects, such as easy interference at corners, and possibly soil extrusion, uneven stress and strain distribution if gaps exist between steel plates.
In addition to the above problems, the existing loading systems have the flexible rubber membrane for sealing the sample without wrapping the loading plate, which is not directly applied to the rock-soil sample, so that the water pressure in the soil hole cannot be directly measured; and the flexible rubber film is wrapped on the loading plate, the sealing performance of the loading plate and the flexible rubber film needs to be solved, and if the sealing effect is not good, the phenomena of water leakage and air leakage can occur, so that the change of pore water pressure in the sample can not be accurately measured, and the change of the volume of the sample can not be accurately measured.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a rigid-flexible combined sliding true triaxial loading device for sealing a sample by applying pressure through an air cylinder.
According to the invention, the invention provides a rigid-flexible combined sliding true triaxial loading device for sealing a sample by applying pressure through an air cylinder, which comprises:
the four rigid sliding loading plates are mutually overlapped along the four directions of the upper direction, the lower direction, the left direction and the right direction to form a rectangular accommodating space, and the rectangular accommodating space is used for accommodating a rock and soil sample to be tested;
the rock-soil sample and the four rigid sliding loading plates are wrapped by the flexible rubber film;
the four loading pistons respectively act on the four rigid sliding loading plates and are used for applying loads to the rigid sliding loading plates;
the four sliding blocks are respectively arranged between the four rigid sliding loading plates and the four loading pistons and are used for realizing the sliding connection between the rigid sliding loading plates and the loading pistons;
the four connecting pieces are respectively arranged between the four sliding blocks and the four rigid sliding loading plates, one end of each connecting piece is fixedly connected with the corresponding sliding block, and the other end of each connecting piece is fixedly connected with the corresponding rigid sliding loading plate and used for transmitting load to the corresponding rigid sliding loading plate;
the air cylinder sealer is arranged on the connecting piece, the connecting piece is positioned on the rigid sliding loading plate above the connecting piece, the air cylinder sealer is connected with an air cylinder, and pressure is applied through the air cylinder to enable the air cylinder sealer to tightly squeeze a gap between the air cylinder sealer and the rigid sliding loading plate; the three thread sealers are respectively arranged on the connecting pieces of the rigid sliding loading plate respectively positioned in the left direction, the right direction and the lower direction, and play a role in sealing the flexible rubber film.
Preferably, the method further comprises the following steps:
the four stress sensors are used for sensing the load of the loading device acting on the rock-soil sample;
and the four displacement sensors are used for sensing the strain of the rock-soil sample under the action of the load.
Preferably, the cross section of the flexible rubber film is rectangular; the rock-soil sample and the four rigid sliding loading plates are packaged in the flexible rubber film to form a cube shape;
the flexible rubber film is provided with four openings respectively for connecting the connecting pieces in a penetrating manner, and the openings of the flexible rubber film are sealed by the thread sealer and the cylinder sealer.
Preferably, the connecting pieces of the rigid sliding loading plate respectively positioned in the left, right and lower directions are provided with threads, and the threads are positioned at one end close to the rigid sliding loading plate;
the thread sealer is annular; the thread sealer is sleeved on the connecting piece and can move up and down along the threads on the connecting piece, the opening of the flexible rubber film can be closed by screwing the thread sealer tightly, and the rigid sliding loading plate and the rock soil sample are completely closed in the flexible rubber film.
Preferably, the cylinder seal is annular; the cylinder sealer is sleeved on the connecting piece positioned above the cylinder sealer, can slide up and down along the connecting piece, and seals the opening of the flexible rubber film by applying pressure through the cylinder, so that the rigid sliding loading plate and the rock and soil sample are wholly sealed in the flexible rubber film.
Preferably, two rigid sliding loading plates respectively positioned in the upper and lower directions are respectively provided with a water seepage hole, and water in the rock soil sample flows into the connecting piece through the water seepage holes.
Preferably, guide holes are arranged on the connecting pieces of the rigid sliding loading plate respectively positioned in the upper direction and the lower direction, and the guide holes are connected with plastic hoses and used for discharging water in the connecting pieces; one end of the plastic hose is connected with the guide hole, and the other end of the plastic hose is connected with the outside and used for discharging water in the guide hole to the outside.
Preferably, the loading piston is driven by a motor system.
Compared with the prior art, the invention has at least one of the following beneficial effects:
according to the device, the flexible rubber film is sealed through the cylinder sealer, so that the phenomenon of air leakage caused by manual sealing is avoided; meanwhile, the cylinder sealer can avoid the damage of the flexible rubber film caused by the friction force generated by manual sealing; and can also realize the closeness and the uninstallation of sealer through the size of control cylinder pressure, conveniently carry out the dismantlement of test instrument and ground sample, after the experiment finishes, demolish the in-process of sample, the dismantlement of cylinder sealer is simpler, as long as the pressure of dismantling on the cylinder just can dismantle. The sealing mode that adopts cylinder seal and thread sealing ware to combine together among the above-mentioned device not only can play good sealed effect in the experimentation, is convenient for simultaneously experiment operation again.
The device of the invention uses the rigid sliding plate and the flexible film to load stress, thereby overcoming the defect that only the rigid plate and only the flexible film are used for loading. In addition, the sliding block is arranged between the loading piston and the rigid sliding loading plate, so that the loading piston is always positioned at the central position of the deformed central accommodating space, the load can be guaranteed to be applied to the central position of the rock and soil sample, and the uniform distribution of the internal stress of the rock and soil sample is guaranteed.
Meanwhile, in the sliding loading device, the rigid sliding loading plate and the rock-soil sample are wholly sealed in the accommodating space by the flexible rubber film, sealing is carried out by screwing the screw on the fastening piece, and a comprehensive stress path test is realized by changing the position of the flexible rubber film. The flexible rubber film of a general composite true triaxial apparatus can only wrap a rock-soil sample to be tested, the rigid loading plate is arranged outside the flexible rubber film, the stress applied to the rock-soil sample by the rigid sliding loading plate in the horizontal direction is equal to the sum of the water pressure of the pressure chamber and the pressure of the rigid loading plate, and cannot be smaller than the water pressure in the confining pressure chamber, so that any Lode angle test of 0-360 degrees cannot be carried out. In the invention, the flexible rubber film is innovatively designed and is applied with load outside the rigid sliding loading plate through the loading piston connected with the rigid sliding loading plate, so that the pore water pressure can be directly measured, the pressure of the rock-soil sample in the direction is smaller than the water pressure in the confining pressure chamber during shearing, and a random Lode angle test of 0-360 degrees can be carried out.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a vertical cross-sectional view of the principle of construction of a true triaxial loading apparatus according to a preferred embodiment of the present invention;
FIG. 2a is a front view of a preferred embodiment of the present invention showing the thread seal loading apparatus;
FIG. 2b is a side view of a preferred embodiment of the present invention showing the thread seal loading apparatus;
FIG. 2c is a top view of a preferred embodiment of the present invention showing the thread seal loading apparatus;
FIG. 3a is a front view of a preferred embodiment of the present invention showing the true triaxial band cylinder seal loading apparatus;
FIG. 3b is a side view of a preferred embodiment of the present invention showing the true triaxial band cylinder seal loading apparatus;
fig. 3c is a top view of the true triaxial band cylinder seal loading apparatus according to a preferred embodiment of the present invention.
The scores in the figure are indicated as: geotechnical sample 10, test chamber 20, loading device 30, rigid sliding loading plates 301, 302, 303, 304, threaded sealers 305, 307, 308, connectors 309, 310, 311, 312, sliding blocks 313, 314, 315, 316, stress sensors 317, 318, 319, 320, loading pistons 321, 322, 323, 324.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a rigid-flexible combined sliding true triaxial loading apparatus for sealing a sample by applying pressure through an air cylinder according to an embodiment of the present invention is shown, wherein the loading apparatus 30 is disposed inside a test chamber 20, and the test chamber 20 is a sealed chamber filled with water. The loading device 30 includes: four rigid sliding load plates 301, 302, 303, 304 and a cubical, flexible rubber membrane; the four rigid sliding loading plates 301, 302, 303 and 304 are overlapped with each other along four directions, namely, the upper direction, the lower direction, the left direction and the right direction to form a rectangular accommodating space for accommodating the rock and soil sample 10 to be tested, namely, the rock and soil sample 10 clamped by the loading device 30 is positioned in the central accommodating space; the geotechnical specimen 10 and the four rigid sliding load plates 301, 302, 303, 304 are enclosed in a cubic flexible rubber film (not shown) to be also formed into a cubic shape, and then held by the sliding load device 30 of the present invention.
Referring to fig. 1, the rigid sliding load plates 302 and 304 of the four rigid sliding load plates 301, 302, 303 and 304 are vertical plates for applying vertical loads to the geotechnical specimen 10; the rigid sliding loading plates 301 and 303 are horizontal plates and are used for applying horizontal loads to the rock-soil sample 10; while the remaining two directions are not provided with the loading plates but are loaded in directions located at both sides perpendicular to the drawing plane by the flexible rubber films wrapping the soil sample 10.
Referring to fig. 1, rigid sliding load plates 301, 302, 303, 304 overlap in a manner that allows them to slide relative to each other. Specifically, as shown in fig. 1, the lower end of rigid sliding load plate 303 (a horizontal plate) is positioned above the upper surface of rigid sliding load plate 304 (a vertical plate), while the other end is in contact with the left end of rigid sliding load plate 302, such that rigid sliding load plate 303 may slide along the upper surface of rigid sliding load plate 304. The other three rigid load plates 301, 302, 304 are overlapped in sequence in the same manner.
The sliding loading device 30 further comprises four loading pistons 321, 322, 323, 324 acting on the rigid sliding loading plates 301, 302, 303, 304, respectively, and four sliding blocks 313, 314, 315, 316 connecting between the rigid sliding loading plates 301, 302, 303, 304 and the loading pistons 321, 322, 323, 324 for applying a load to the rigid sliding loading plates 301, 302, 303, 304. The four rigid sliding loading plates 301, 302, 303, 304 are overlapped in such a manner that they can slide in horizontal and vertical directions with each other by the loading pistons 321, 322, 323, 324, so that the central receiving space is reduced as the soil sample 10 is strained by the load, thereby ensuring that the load is always applied to the soil sample 10.
In order to ensure that the loading pistons 321, 322, 323 and 324 still act on the central position of the geotechnical specimen 10 after the rigid sliding loading plates 301, 302, 303 and 304 slide, thereby ensuring uniform stress of the geotechnical specimen 10, the loading pistons 321, 322, 323 and 324 and the rigid sliding loading plates 301, 302, 303 and 304 are slidably connected through sliding blocks 313, 314, 315 and 316. The sliding blocks 313, 314, 315, 316 are fixedly connected with the rigid sliding loading plates 301, 302, 303, 304, and are slidably connected with the loading pistons 321, 322, 323, 324 along the strain direction of the geotechnical sample 10. Due to the sliding blocks 313, 314, 315, 316, the sliding loading plates can slide relative to each other in the horizontal direction and the vertical direction under the action of the loading pistons. Therefore, after the rock-soil sample 10 is strained and the rigid sliding loading plates 301, 302, 303 and 304 slide, the sliding blocks 313, 314, 315 and 316 are slid to be positioned at the center of the deformed central accommodating space, so that the load can be applied to the center of the rock-soil sample 10, and the uniform distribution of the interior of the rock-soil is ensured.
The sliding loading device 30 further includes four connecting members 309, 310, 311, and 312, where the four connecting members 309, 310, 311, and 312 are respectively disposed between the four sliding blocks 313, 314, 315, and 316 and the four rigid sliding loading plates 301, 302, 303, and 304, one end of each connecting member 309, 310, 311, and 312 is fixedly connected to the sliding block 313, 314, 315, and 316, and the other end is fixedly connected to the rigid sliding loading plates 301, 302, 303, and 304, and is used for transmitting loads to the rigid sliding loading plates 301, 302, 303, and 304. In the concrete implementation process, the connecting members 309, 310, 311, 312 are fixedly connected with the sliding blocks 313, 314, 315, 316 through screws, the connecting members 309, 310, 311, 312 are separated from the sliding blocks 313, 314, 315, 316 in the sample loading process, and after the sample loading is finished, the connecting members 309, 310, 311, 312 and the sliding blocks 313, 314, 315, 316 are fixedly connected together to transmit loads through tightening the screws between the sliding blocks 313, 314, 315, 316 and the connecting members 309, 310, 311, 312.
The rigid sliding load plates 301, 302, 303, 304 and the geotechnical specimen 10 are entirely enclosed in the flexible rubber film in order to ensure sealability between the flexible rubber film and the rigid sliding load plates 301, 302, 303, 304. The loading device 30 further comprises an air cylinder sealer and three thread sealers 305, 307 and 308, wherein the air cylinder sealer is arranged on a connecting piece 310 of the upper rigid sliding loading plate 302, the air cylinder sealer is connected with an air cylinder, pressure is applied through the air cylinder to enable the air cylinder sealer to tightly squeeze a gap between the air cylinder sealer and the rigid sliding loading plate 302, sealing of the flexible rubber film is achieved through the air cylinder sealer, the phenomenon of air leakage caused by manual sealing is avoided, the sealer can be tightly closed and unloaded by controlling the pressure of the air cylinder, and the test instrument and the rock soil sample 10 can be conveniently detached. In the whole experiment loading device, except the upper loading device, the other loading devices in three directions are all fixed in the laboratory, the upper loading device is covered after the rock soil sample 10 is placed in, and the upper loading device is not fixed, so that the loading device is more convenient to be connected with an external cylinder for pressing. Adopt outside cylinder to exert pressure and compare in adopting thread sealing ware to seal, can avoid adopting thread sealing to lead to leaking gas phenomenon because of the damage that flexible rubber film can be caused to the frictional force at the in-process of screwing up or unscrewing, sealed effect is better.
Because the loading devices in the other three directions are all fixed in a laboratory, the thread sealers 305, 307 and 308 are used for sealing in order to facilitate the operation, the structures of the thread sealers 305, 307 and 308 are simple, the sealing is realized by screwing the screws manually, and the operation is more convenient. Three thread sealers 305, 307, 308 are respectively arranged on the connecting pieces 309, 311, 312 of the left, right and lower rigid sliding loading plates 301, 303, 304, and the three thread sealers 305, 307, 308 are sealed by manually screwing the screws, thereby playing a role of sealing the flexible rubber film.
The loading pistons 321, 322, 323, 324 in this embodiment may be driven by a motor system.
In some other preferred embodiments, four stress sensors 317, 318, 319, 320 are also provided inside the test chamber 20, two of which are located horizontally and two of which are located vertically, in order to measure the load applied by each loading piston 321, 322, 323, 324 to each rigid sliding loading plate 301, 302, 303, 304. Referring to fig. 1, four stress sensors 317, 318, 319, 320 are each in the shape of a ring and are respectively fixed to loading pistons 321, 322, 323, 320.
In addition, in order to measure the strain of the geotechnical specimen 10 under load, the two loading pistons 322 and 324 at the top (upward direction) and the bottom (downward direction) are respectively provided with a displacement sensor (not shown) for measuring the displacement in the vertical direction. The two horizontal loading pistons 321, 323 are used to apply pressure in the horizontal direction, and are also provided with displacement sensors, respectively, for measuring displacement in the horizontal direction.
In other preferred embodiments, the loading device 30 of the present invention may be suitably adapted for a particular test protocol. Guide holes 41 and 42 are respectively arranged on two connecting pieces 310 and 312 of rigid sliding loading plates 302 and 304 which are positioned in the up and down directions; and two plastic hoses respectively used for connection, the two plastic hoses being respectively connected to the outside from the two guide holes, the plastic hoses being used for measuring drainage in a drainage shear test or measuring pressure of water in a non-drainage test. Water seepage holes are respectively formed on the two rigid sliding loading plates 302 and 304 which are positioned in the up and down directions, and water in the rock-soil sample 10 flows into the connectors 310 and 312 through the water seepage holes and is discharged from the plastic hose through the guide holes 41 and 42 on the connectors 310 and 312.
In other partially preferred embodiments, as shown in fig. 1 and fig. 2a, 2b and 2c, the connecting members 309, 311 and 312 are provided with threads near one end of the rigid sliding load plate, the three thread sealers 305, 307 and 308 are annular and are respectively sleeved on the connecting members 309, 311 and 312, and the thread sealers 305, 307 and 308 can move up and down on the connecting members 309, 311 and 312 along the threads. By tightening the sealer, the opening of the flexible rubber film can be closed, so that the rigid sliding load plates 301, 302, 303, 304 and the rock-soil sample 10 are entirely enclosed in the accommodating space, thereby playing a role in sealing the rock-soil sample 10.
In other preferred embodiments, as shown in fig. 1 and fig. 3a, 3b and 3c, the cylinder sealer 306 is annular, the cylinder sealer 306 is sleeved on the connector 310 located above, and the cylinder sealer 306 can slide up and down along the connector; the annular cylinder sealer 306 is connected with an external cylinder, and applies pressure through the external cylinder, and the cylinder sealer can squeeze and slide a gap between the plates, so that an opening of the flexible rubber film is sealed, and the rigid sliding loading plate and the rock soil sample 10 are wholly sealed in the accommodating space.
In other partially preferred embodiments, the geotechnical specimen 10 and four rigid sliding load plates are encased in a flexible rubber membrane and formed into a cubic shape, as shown in FIG. 1. The cross section of the flexible rubber film is rectangular, an opening is respectively arranged on the corresponding surfaces of the flexible rubber film and the four rigid sliding loading plates 301, 302, 303 and 304, so that the connecting piece and the sealer connected with the four rigid sliding loading plates 301, 302, 303 and 304 respectively penetrate through the opening, and the four openings are sealed by the thread sealers 305, 307 and 308 and the air cylinder sealer 306 after penetrating out, so that the rigid sliding loading plates 301, 302, 303 and 304 and the rock and soil sample 10 are completely sealed in the accommodating space.
The loading device 30 of the present invention overcomes the disadvantages of loading with rigid plates only and flexible membranes only by using four rigid sliding loading plates 301, 302, 303, 304 and a flexible rubber membrane to load stress. Since the sliding blocks 313, 314, 315, 316 are respectively and fixedly connected with the rigid sliding loading plates 301, 302, 303, 304 through the connecting members 309, 310, 311, 312, and are in sliding connection with the loading pistons 321, 322, 323, 324, it is possible to ensure that the load is applied to the central position of the geotechnical specimen 10 by sliding the sliding blocks 313, 314, 315, 316 to be located at the central position of the deformed central accommodating space after the geotechnical specimen 10 is strained and the rigid sliding loading plates 301, 302, 303, 304 are slid, thereby ensuring uniform distribution of internal stress of the geotechnical specimen 10. Meanwhile, the loading device 30 designed by the invention creatively designs the flexible rubber film and the rigid sliding loading plate, applies loads through the loading pistons 321, 322, 323 and 324 connected with the rigid sliding loading plates 301, 302, 303 and 304, can directly measure pore water pressure, can realize that the pressure of the rock soil sample 10 in the direction is smaller than the water pressure in the confining pressure chamber during shearing, and can perform any Lode angle test of 0-360 degrees.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (8)
1. The utility model provides a real triaxial loading device of rigid-flexible combination slip that seals sample is exerted pressure through the cylinder which characterized in that: the method comprises the following steps:
the four rigid sliding loading plates are mutually overlapped along the four directions of the upper direction, the lower direction, the left direction and the right direction to form a rectangular accommodating space, and the rectangular accommodating space is used for accommodating a rock and soil sample to be tested;
the rock-soil sample and the four rigid sliding loading plates are wrapped by the flexible rubber film;
the four loading pistons respectively act on the four rigid sliding loading plates and are used for applying loads to the rigid sliding loading plates;
the four sliding blocks are respectively arranged between the four rigid sliding loading plates and the four loading pistons and are used for realizing the sliding connection between the rigid sliding loading plates and the loading pistons;
the four connecting pieces are respectively arranged between the four sliding blocks and the four rigid sliding loading plates, one end of each connecting piece is fixedly connected with the corresponding sliding block, and the other end of each connecting piece is fixedly connected with the corresponding rigid sliding loading plate and used for transmitting load to the corresponding rigid sliding loading plate;
the air cylinder sealer is arranged on the connecting piece, the connecting piece is positioned on the rigid sliding loading plate above the connecting piece, the air cylinder sealer is connected with an air cylinder, and pressure is applied through the air cylinder to enable the air cylinder sealer to tightly squeeze a gap between the air cylinder sealer and the rigid sliding loading plate; the three thread sealers are respectively arranged on the connecting pieces of the rigid sliding loading plate which are respectively positioned in the left direction, the right direction and the lower direction, and play a role in sealing the flexible rubber film, so that the rigid sliding loading plate and the rock soil sample are wholly sealed in the flexible rubber film.
2. The rigid-flexible combined sliding true triaxial loading device for closing a sample by applying pressure through an air cylinder according to claim 1, wherein: further comprising:
the four stress sensors are used for sensing the load of the loading device acting on the rock-soil sample;
and the four displacement sensors are used for sensing the strain of the rock-soil sample under the action of the load.
3. The rigid-flexible combined sliding true triaxial loading device for closing a sample by applying pressure through an air cylinder according to claim 1, wherein: the cross section of the flexible rubber film is rectangular; the rock-soil sample and the four rigid sliding loading plates are packaged in the flexible rubber film to form a cube shape;
the flexible rubber film is provided with four openings respectively for connecting the connecting pieces in a penetrating manner, and the openings of the flexible rubber film are sealed by the thread sealer and the cylinder sealer, so that the rigid sliding loading plate and the rock soil sample are completely sealed in the flexible rubber film.
4. The rigid-flexible combined sliding true triaxial loading device for closing a sample by applying pressure through an air cylinder according to claim 3, wherein: threads are arranged on the connecting pieces of the rigid sliding loading plate respectively positioned in the left direction, the right direction and the lower direction, and the threads are positioned at one end close to the rigid sliding loading plate;
the thread sealer is annular; the thread sealer is sleeved on the connecting piece and can move up and down along the threads, and the opening of the flexible rubber film can be closed by screwing the thread sealer tightly.
5. The rigid-flexible combined sliding true triaxial loading device for closing a sample by applying pressure through an air cylinder according to claim 3, wherein: the cylinder sealer is annular; the cylinder sealer is sleeved on the connecting piece positioned above the cylinder sealer, can slide up and down along the connecting piece, and seals the opening of the flexible rubber film by applying pressure through the cylinder.
6. The rigid-flexible combined sliding true triaxial loading device for closing a sample by applying pressure through an air cylinder according to claim 1, wherein: and the two rigid sliding loading plates which are respectively positioned in the upper direction and the lower direction are respectively provided with a water seepage hole, and water in the rock soil sample flows into the connecting piece through the water seepage holes.
7. The rigid-flexible combined sliding true triaxial loading device for closing a sample by applying pressure through an air cylinder according to claim 6, wherein: guide holes are arranged on the connecting pieces of the rigid sliding loading plate respectively positioned in the upper direction and the lower direction, and the guide holes are connected with plastic hoses and used for discharging water in the connecting pieces; one end of the plastic hose is connected with the guide hole, and the other end of the plastic hose is connected with the outside and used for discharging water in the guide hole to the outside.
8. The rigid-flexible combined sliding true triaxial loading device for closing a sample by applying pressure through an air cylinder according to claim 1, wherein: the loading piston is driven by a motor system.
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| CN201911383436.2A CN110987644A (en) | 2019-12-27 | 2019-12-27 | Rigid-flexible combined sliding true triaxial loading device for sealing sample by applying pressure through air cylinder |
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| CN201911383436.2A CN110987644A (en) | 2019-12-27 | 2019-12-27 | Rigid-flexible combined sliding true triaxial loading device for sealing sample by applying pressure through air cylinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111982480A (en) * | 2020-05-11 | 2020-11-24 | 北京机械设备研究所 | Technological method for improving discreteness of friction force of cylinder |
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2019
- 2019-12-27 CN CN201911383436.2A patent/CN110987644A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111982480A (en) * | 2020-05-11 | 2020-11-24 | 北京机械设备研究所 | Technological method for improving discreteness of friction force of cylinder |
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