CN114264546B - Self-balancing hydraulic system, rock test piece surface normal displacement monitoring device and method - Google Patents
Self-balancing hydraulic system, rock test piece surface normal displacement monitoring device and method Download PDFInfo
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- CN114264546B CN114264546B CN202111602578.0A CN202111602578A CN114264546B CN 114264546 B CN114264546 B CN 114264546B CN 202111602578 A CN202111602578 A CN 202111602578A CN 114264546 B CN114264546 B CN 114264546B
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- 239000011435 rock Substances 0.000 title claims abstract description 84
- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 238000012806 monitoring device Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000003921 oil Substances 0.000 claims description 49
- 238000007789 sealing Methods 0.000 claims description 40
- 239000010720 hydraulic oil Substances 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000010008 shearing Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 238000010168 coupling process Methods 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000008878 coupling Effects 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 239000010438 granite Substances 0.000 description 3
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- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
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Abstract
The invention discloses a self-balancing hydraulic system, a rock test piece surface normal displacement monitoring device and a method, wherein the device comprises a measuring rod, a first cylinder and a second cylinder, wherein the first cylinder is nested in the second cylinder to form a self-balancing oil chamber; the measuring rod penetrates through the self-balancing oil chamber from the second cylinder and extends out of the first cylinder; the side wall of the end part of the measuring rod, which extends out of the first cylinder, is provided with an oil inlet, and a diversion channel is also arranged in the measuring rod and is respectively communicated with the oil inlet and the self-balancing oil chamber; the problems that the normal displacement measurement of a rock sample is inaccurate when the rock mechanics and rock fracture shear seepage test is carried out in the traditional conventional triaxial pressure chamber are solved through the combination of the self-balancing hydraulic system and the displacement sensor.
Description
Technical Field
The invention relates to the technical field of rock mechanics tests, in particular to a self-balancing hydraulic system, a rock test piece deformation monitoring device and a method.
Background
The statements in this section merely relate to the background of the present disclosure and may not necessarily constitute prior art.
The rock mass consists of a rock mass and a crack, the crack is a main channel for water conduction, and the shear slip instability of the rock mass under the action of hydraulic coupling often causes serious geological disasters, so that the deep research on the shear-seepage coupling characteristic of the rock mass and the instability rule caused by the shear-seepage coupling characteristic has a crucial effect on guaranteeing the safety and stability of underground rock mass engineering, and the shear seepage coupling test of the rock crack is a most direct and effective means for researching the hydraulic characteristic of the rock crack; meanwhile, related mechanical parameters of the rock are important points of the rock mass engineering, and in order to accurately obtain rock mechanical parameters (stress-strain curve, strength, elastic modulus, poisson ratio and the like), a plurality of conventional rock mechanical tests such as a uniaxial compression test and a conventional triaxial test are required to be carried out.
At present, the conventional triaxial and shear seepage tests based on the conventional triaxial pressure chamber have main defects:
1) The surface normal displacement sensor is difficult to install due to the size of the conventional triaxial pressure chamber;
2) In a general conventional triaxial compression test, a circumferential extensometer is used for measuring radial dimensional changes of a rock sample, but a direct shear test can generate larger shear displacement on an axis, so that the circumferential extensometer is not suitable for measuring normal displacement of the sample in a direct shear test process.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a self-balancing hydraulic system, a rock test piece deformation monitoring device and a rock test piece deformation monitoring method, which are used for accurately measuring rock test piece deformation or normal deformation of a rock fracture surface of a rock fracture in a shear seepage coupling process, are beneficial to more accurately researching the influence of a shear seepage coupling effect on the fracture mechanical opening degree, and provide scientific guidance for the shear seepage research of a fractured rock body.
According to some embodiments, a first aspect of the present invention provides a self-balancing hydraulic system, which adopts the following technical scheme:
the self-balancing hydraulic system comprises a measuring rod, a first cylinder and a second cylinder, wherein the first cylinder is nested in the second cylinder to form a self-balancing oil chamber; the measuring rod penetrates through the self-balancing oil chamber from the second cylinder and extends out of the first cylinder;
the measuring rod extends out of the side wall of the end part of the first cylinder and is provided with an oil inlet, a flow guide channel is further arranged in the measuring rod, and the flow guide channel is respectively communicated with the oil inlet and the self-balancing oil chamber.
Further, the part of the measuring rod, which is positioned in the self-balancing oil chamber, is sleeved with a spring, and the force of the spring acting on the measuring rod is used for pointing to the piece to be measured; a second sealing ring is arranged at the joint of the measuring rod and the second column; a first sealing ring is arranged at the joint of the measuring rod and the first column body; the junction of the first cylinder and the second cylinder is provided with a third sealing ring and a fourth sealing ring.
Further, the first cylinder inner cavity is a step-shaped inner cavity, and the step-shaped inner cavity comprises a first inner cavity, a second inner cavity and a third inner cavity;
the first inner cavity and the second inner cavity are sleeved with each other to form a self-balancing oil chamber; a channel is formed between the second inner cavity and the measuring rod part structure and is used for communicating the self-balancing oil chamber and the flow guide channel; the third inner cavity is sleeved with the end part of the measuring rod, and the inner diameter of the third inner cavity is matched with the outer diameter of the end part of the measuring rod.
Further, the first lumen has a larger diameter than the second lumen, and the second lumen has a larger diameter than the third lumen.
Further, an exhaust channel is arranged on the side wall of the first cylinder and used for exhausting air brought by the back and forth movement of the measuring rod out of the self-balancing hydraulic system.
According to some embodiments, the second scheme of the invention provides a rock test piece surface normal displacement monitoring device, which adopts the following technical scheme:
the normal displacement monitoring device for the surface of the rock test piece comprises a displacement meter fixing plate, wherein a first displacement meter and a second displacement meter are respectively fixed at two ends of the displacement meter fixing plate; the head of the first displacement meter is contacted with the first baffle, and the head of the second displacement meter is contacted with the second baffle; the first baffle is fixed with a first self-balancing hydraulic system, and the second baffle is fixed with a second self-balancing hydraulic system.
Further, the displacement meter fixing plate is fixed on a triaxial pressure chamber, and a confining pressure chamber is formed between the triaxial pressure chamber and the rock test piece.
Further, the first self-balancing hydraulic system penetrates through the triaxial pressure chamber and extends into the confining pressure chamber; the end part of a measuring rod of the first self-balancing hydraulic system is arranged in the confining pressure chamber;
the second self-balancing hydraulic system penetrates through the triaxial pressure chamber and stretches into the confining pressure chamber; and the end part of a measuring rod of the second self-balancing hydraulic system is arranged in the confining pressure chamber.
Further, the measuring rod is in contact with the sealing sleeve, and a rock test piece is sleeved in the sealing sleeve.
According to some embodiments, the third scheme of the invention provides a rock test piece surface normal displacement monitoring method, which adopts the following technical scheme:
a rock test piece surface normal displacement monitoring method comprises the following steps:
sleeving a rock test piece in a sealing sleeve to perform a test, and relatively contacting the rock test piece through a first self-balancing hydraulic system and a second self-balancing hydraulic system, wherein measuring rods of the first self-balancing hydraulic system and the second self-balancing hydraulic system are directly immersed in hydraulic oil in a confining pressure chamber and are contacted with the sealing sleeve; after hydraulic oil in the confining pressure chamber passes through the oil inlet of the measuring rod, the hydraulic oil reaches the self-balancing oil chamber through the diversion channel, so that the measuring rod is in a stress balance state;
when the normal displacement of the rock test piece changes, the measuring rod of the first self-balancing hydraulic system and the measuring rod of the second self-balancing hydraulic system are driven to move, so that the first baffle plate and the second baffle plate are driven to move respectively, the displacement of the first self-balancing hydraulic system and the displacement of the second self-balancing hydraulic system are transmitted to the first displacement meter and the second displacement meter respectively through the first baffle plate and the second baffle plate, and the measured values of the first displacement meter and the second displacement meter are the change values of the normal position of the rock test piece.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the measuring rod of the self-balancing hydraulic system is directly immersed in the hydraulic oil in the confining pressure chamber and is in direct contact with the sealing sleeve, the hydraulic oil in the confining pressure chamber passes through the oil inlet of the measuring rod and then reaches the self-balancing oil chamber through the flow guide channel, so that the measuring rod is in a stress balance state, can freely move along with deformation of a rock crack, and can accurately measure the deformation of a rock sample or the normal deformation of a rock crack surface of the rock crack in the shearing seepage coupling process, thereby solving the problems of inaccurate normal displacement measurement of the rock sample when the conventional triaxial pressure chamber is used for developing rock mechanics and rock crack shearing seepage tests.
2. According to the invention, the normal displacement monitoring device for the surface of the rock test piece is utilized, when the conventional triaxial pressure chamber is used for performing conventional triaxial and shear seepage tests, displacement change occurs in the normal direction of the rock fracture test piece, the measuring rod is driven to move, the movement of the measuring rod drives the baffle to move, and as the displacement meter is in direct contact with the baffle and is in a compressed state, when the displacement of the baffle changes, the displacement meter can directly measure the change value, so that the problems of inaccurate normal displacement measurement of the rock test piece when the conventional triaxial pressure chamber is used for performing rock mechanics and rock fracture shear seepage tests are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a diagram showing the overall structure of a rock specimen surface normal displacement monitoring device according to an embodiment of the present invention;
FIG. 2 is an internal structural diagram of a rock specimen surface normal displacement monitoring device provided by an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of a self-balancing hydraulic system according to an embodiment of the present invention;
FIG. 4 is a graph of normal displacement measurements of a joint crack sample in a granite joint shear seepage test conducted by the present invention;
in the figure: the device comprises a first baffle, a head part of a first displacement meter, a 3-displacement meter fixing plate, a 4-first displacement meter, a 5-rock test piece, a 6-sealing sleeve, a 7-second displacement meter, a head part of a 8-second displacement meter, a 9-second baffle, a 10-first self-balancing hydraulic system, an 11-measuring rod oil inlet, a 12-second self-balancing hydraulic system, a 13-measuring rod, a 14-second cylinder, a 15-first cylinder, a 16-confining pressure chamber, a 17-triaxial pressure chamber, a 18-diversion channel, a 19-exhaust channel, a 20-first sealing ring, a 21-self-balancing oil chamber, a 22-third sealing ring, a 23-fourth sealing ring, a 24-second sealing ring, a 25-spring, a 26-adjusting nut and a 27-cylindrical steel pipe.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. refer to an orientation or a positional relationship based on that shown in the drawings, and are merely relational terms, which are used for convenience in describing structural relationships of various components or elements of the present invention, and do not denote any one of the components or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly attached," "connected," "coupled," and the like are to be construed broadly and refer to either a fixed connection or an integral or removable connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present invention can be determined according to circumstances by a person skilled in the relevant art or the art, and is not to be construed as limiting the present invention.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
As shown in fig. 3, the present embodiment provides a self-balancing hydraulic system, which includes a measuring rod 13, a first cylinder 15 and a second cylinder 14, wherein the first cylinder 15 is nested in the second cylinder 14 to form a self-balancing oil chamber 21; the measuring rod 13 penetrates through the self-balancing oil chamber 21 from the second cylinder 14 and extends out of the first cylinder 15;
the side wall of the end part of the measuring rod 13 extending out of the first column body 15 is provided with an oil inlet 11, a diversion channel 18 is further arranged in the measuring rod 13, and the diversion channel 18 is respectively communicated with the oil inlet and the self-balancing oil chamber 21.
Specifically, the self-balancing oil chamber 21 is composed of the measuring rod 13, the spring 25, the first column 15 and the second column 14, hydraulic oil in the confining pressure chamber 6 enters the self-balancing oil chamber 21 through the oil inlet 11 of the measuring rod 13 and the internal flow guide channel 18 of the measuring rod 13, so that the self-balancing state of the measuring rod 13 is realized, and the movement of the measuring rod 13 is ensured not to be influenced by the hydraulic oil in the confining pressure chamber 6.
Specifically, the part of the measuring rod 13 located in the self-balancing oil chamber 21 is sleeved with a spring 25, and the force of the spring 25 acting on the measuring rod 13 is used for pointing to the to-be-measured piece; the spring 25 has a certain compression amount, the force of the spring 25 acting on the measuring rod 13 is always directed to the rock sample, the measuring rod 13 is ensured to be always contacted with the sample wrapped by the sealing sleeve, and the self-balancing design ensures that the measuring rod 13 can freely move in the normal direction of the rock joint surface in the shearing process.
Specifically, a second sealing ring 24 is arranged at the joint of the measuring rod 13 and the second cylinder 14; the second seal ring 24 is used for sealing the self-balancing oil chamber 21, and preventing hydraulic oil in the self-balancing oil chamber 21 from flowing out along the contact portion of the measuring rod 13 and the second cylinder 14.
A first sealing ring 20 is arranged at the joint of the measuring rod 13 and the first column 15; the first seal ring 20 is used for separating the confining pressure chamber 6 and the self-balancing oil chamber 21, and preventing hydraulic oil in the confining pressure chamber 6 from entering the self-balancing oil chamber 21 along the outer wall of the measuring rod 13.
The joint of the first cylinder 15 and the second cylinder 14 is provided with a third sealing ring 22 and a fourth sealing ring 23, and the third sealing ring 22 and the fourth sealing ring 23 are used for sealing the self-balancing oil chamber 21 to prevent hydraulic oil in the self-balancing oil chamber 21 from flowing out along the contact part of the first cylinder 15 and the second cylinder 14.
Wherein, the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring adopt O-shaped rubber rings.
In a specific embodiment, the inner cavity of the first column 15 is a step-shaped inner cavity, and the step-shaped inner cavity includes a first inner cavity, a second inner cavity and a third inner cavity;
the first inner cavity and the inner cavity of the second cylinder 14 are sleeved to form a self-balancing oil chamber 21; a channel is formed between the second inner cavity and part of the structure of the measuring rod 13 and is used for communicating the self-balancing oil chamber 21 and the diversion channel 18; the third inner cavity is sleeved with the end part of the measuring rod 13, and the inner diameter of the third inner cavity is matched with the outer diameter of the end part of the measuring rod 13.
Specifically, as shown in fig. 1, 2 and 3, the measuring rod 13 is a spindle-type measuring rod, so as to realize that the measuring rod, the first column body and the second column body are mutually matched to form a self-balancing hydraulic system; from left to right, the external diameter of the first part of the rod body of the measuring rod is smaller than the external diameter of the second part of the rod body, and the external diameter of the second part of the rod body is larger than the external diameter of the third part of the rod body;
the first part of rod body of the measuring rod 13 is a first part of rod body, wherein the measuring rod 13 is connected with the baffle plate and the second cylinder 14 and penetrates through the self-balancing oil pressure chamber 21, the outer diameter of the first part of rod body is matched and consistent with the inner diameter of a through hole on the baffle plate, and the through hole is used for sleeving the baffle plate and the first part of rod body of the measuring rod 13;
the second part of rod body of the measuring rod 13 is a second part of rod body of the measuring rod 13 which is connected with the first column 15 and penetrates through the second inner cavity of the first column 15;
the third part of rod body of the measuring rod 13 is a third part of rod body, wherein the measuring rod 13 is connected with the first column 15 and penetrates through the third inner cavity of the first column 15, and the outer diameter of the third part of rod body is matched with the inner diameter of the third inner cavity of the first column 15 in a consistent manner; and the side wall of the end part of the third part of the rod body extending out of the first column body 15 is provided with an oil inlet 11, the inside of the third part of the rod body is also provided with a diversion channel 18, and the diversion channel 18 is respectively communicated with the oil inlet 11 and the self-balancing oil chamber 21.
The diameter of the first inner cavity is larger than that of the second inner cavity, and the diameter of the second inner cavity is larger than that of the third inner cavity.
An exhaust channel 19 is arranged outside the side wall of the first column 15 and is used for exhausting air brought by the back and forth movement of the measuring rod 13 out of the self-balancing hydraulic system.
As shown in fig. 3, a cylindrical steel pipe 27 is also fixed at the outer side of the joint of the second cylinder 14 and the measuring rod 13, and the measuring rod 13 passes through the cylindrical steel pipe 27 and then passes through the second cylinder 14 to extend into the self-balancing oil pressure chamber 21;
an adjusting nut 26 is connected to the first part of the rod body of the measuring rod 13 in a threaded manner; the adjusting nut 26 is contacted with the cylindrical steel tube 27, and the length of the measuring rod extending into the confining pressure chamber is changed by changing the position of the adjusting nut 26.
Example two
As shown in fig. 1, the embodiment provides a device for monitoring normal displacement of the surface of a rock test piece 5, which comprises a displacement meter fixing plate 3, wherein a first displacement meter 4 and a second displacement meter 7 are respectively fixed at two ends of the displacement meter fixing plate 3; the head 2 of the first displacement meter is contacted with the first baffle plate 1, and the head 8 of the second displacement meter is contacted with the second baffle plate 9; the first baffle plate 1 is fixedly provided with a first self-balancing hydraulic system 10, and the second baffle plate 9 is fixedly provided with a second self-balancing hydraulic system 12.
The first baffle plate 1 and the second baffle plate 9 are connected with a self-balancing hydraulic system through screws and threads at the tail part of the measuring rod 13; the first displacement meter 4 and the second displacement meter 7 are used for measuring the normal displacement of the shear sample; the displacements of the measuring rods 13 in the first and second self-balancing hydraulic systems 10 and 12 are transmitted to the first and second displacement meters 4 and 7, respectively, through the first and second dampers 1 and 9.
As shown in fig. 2, in particular, the displacement meter fixing plate 3 is fixed to a conventional triaxial pressure chamber 17 by screws for fixing a desired displacement meter, and a confining pressure chamber 6 is formed between the triaxial pressure chamber 17 and the rock specimen 5.
The first self-balancing hydraulic system 10 penetrates from the triaxial pressure chamber 17 and extends into the confining pressure chamber 6; the end part of a measuring rod 13 of the first self-balancing hydraulic system 10 is arranged in the confining pressure chamber 6;
the second self-balancing hydraulic system 12 penetrates from the triaxial pressure chamber 17 and extends into the confining pressure chamber 6; the measuring rod 13 of the second self-balancing hydraulic system 12 is at the end in the confining pressure chamber 6.
As shown in fig. 3, specifically, as shown in fig. 3, a cylindrical steel pipe 27 is fixed at the outer side of the joint of the second cylinder 14 and the measuring rod 13, and the measuring rod 13 passes through the cylindrical steel pipe 27 and then passes through the second cylinder 14 to extend into the self-balancing oil pressure chamber 21;
as shown in fig. 2 and 3, an adjusting nut 26 is connected to the first part of the rod body of the measuring rod 13 in a threaded manner; the adjusting nut 26 is contacted with the cylindrical steel tube 27, and the length of the measuring rod 13 extending into the confining pressure chamber 6 is changed by changing the position of the adjusting nut 26.
The measuring rod 13 is in contact with the sealing sleeve 6, and the rock test piece 5 is sleeved in the sealing sleeve 6.
When installing rock test piece 5, in order to make rock test piece 5 steadily place in place, need carry out spacingly to measuring stick 13, can rotatory adjusting nut 26 for measuring stick 13 removes to the direction of keeping away from rock test piece 5, in order to prevent to cause certain injury to the rock test piece when placing rock test piece 5, when placing the rock test piece, with adjusting nut 26 rotatory to the position of keeping away from the cylinder steel pipe can.
Example III
The embodiment provides a rock test piece surface normal displacement monitoring method, which comprises the following steps:
sleeving a rock test piece 5 in a sealing sleeve 6 for testing, and relatively contacting the rock test piece 5 through a first self-balancing hydraulic system 10 and a second self-balancing hydraulic system 12, wherein a measuring rod 13 of the first self-balancing hydraulic system 10 and a measuring rod 13 of the second self-balancing hydraulic system 12 are directly immersed in hydraulic oil in a confining pressure chamber 6 and are contacted with the sealing sleeve 6; after passing through the oil inlet 11 of the measuring rod 13, the hydraulic oil in the confining pressure chamber 6 reaches the self-balancing oil chamber 21 through the diversion channel 18, so that the measuring rod 13 is in a stress balance state;
when the normal displacement of the rock test piece 5 changes, the measuring rod 13 of the first self-balancing hydraulic system 10 and the measuring rod 13 of the second self-balancing hydraulic system 12 are driven to move, so that the first baffle plate 1 and the second baffle plate 9 are respectively driven to move, the displacement of the first self-balancing hydraulic system 10 and the displacement of the second self-balancing hydraulic system 12 are respectively transmitted to the first displacement meter 4 and the second displacement meter 7 through the first baffle plate 1 and the second baffle plate 9, and the measured values of the first displacement meter 4 and the second displacement meter 7 are the change values of the normal position of the rock test piece 5.
In order to embody the technical scheme and advantages of the invention, the monitoring of normal displacement in the shear seepage coupling test process of a rock fracture sample is discussed in detail below by way of example and with reference to the accompanying drawings. Taking two semi-cylindrical granite test pieces with the dimension of phi 50 multiplied by 100mm as an example, purified water is selected as seepage fluid, and then the normal displacement change of the granite test pieces in the shearing seepage coupling process is studied by adopting the method. The test measurement results are shown in fig. 4.
As can be seen from fig. 4, in the initial shearing stage, as the shearing displacement increases, the shearing stress increases approximately linearly, and then the shearing stress increases at a reduced speed, and when the shearing displacement reaches about 0.3mm, the sample reaches the peak strength, and then the sample breaks; then, as the shear displacement continues to increase, the shear stress is kept at a certain level; the normal displacement tends to decrease and then increase, the joint surface is in a compaction state before reaching the peak value, and when the shear displacement reaches about 0.46mm, the joint begins to generate shear expansion, and the normal displacement increases. The evolution trend of the shear stress and the normal displacement of the test is consistent with the test result of the former.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The normal displacement monitoring device for the surface of the rock test piece is characterized by comprising a displacement meter fixing plate, wherein a first displacement meter and a second displacement meter are respectively fixed at two ends of the displacement meter fixing plate; the head of the first displacement meter is contacted with the first baffle, and the head of the second displacement meter is contacted with the second baffle; the first baffle is fixedly provided with a first self-balancing hydraulic system, and the second baffle is fixedly provided with a second self-balancing hydraulic system;
the first self-balancing hydraulic system and the second self-balancing hydraulic system comprise a measuring rod, a first cylinder and a second cylinder, and the first cylinder is nested in the second cylinder to form a self-balancing oil chamber; the measuring rod penetrates through the self-balancing oil chamber from the second cylinder and extends out of the first cylinder, and the measuring rods of the first self-balancing hydraulic system and the second self-balancing hydraulic system are directly immersed in hydraulic oil in the confining pressure chamber and are in contact with the sealing sleeve;
the side wall of the end part of the measuring rod, which extends out of the first cylinder, is provided with an oil inlet, and a diversion channel is also arranged in the measuring rod and is respectively communicated with the oil inlet and the self-balancing oil chamber;
the part of the measuring rod, which is positioned in the self-balancing oil chamber, is sheathed with a spring, and the force of the spring acting on the measuring rod is used for pointing to the piece to be measured.
2. The device for monitoring the normal displacement of the surface of a rock test piece according to claim 1, wherein a second sealing ring is arranged at the joint of the measuring rod and the second cylinder; a first sealing ring is arranged at the joint of the measuring rod and the first column body; the junction of the first cylinder and the second cylinder is provided with a third sealing ring and a fourth sealing ring.
3. The rock specimen surface normal displacement monitoring device of claim 2, wherein the first cylinder cavity is a stepped cavity comprising a first cavity, a second cavity and a third cavity;
the first inner cavity and the second inner cavity are sleeved with each other to form a self-balancing oil chamber; a channel is formed between the second inner cavity and the measuring rod part structure and is used for communicating the self-balancing oil chamber and the flow guide channel; the third inner cavity is sleeved with the end part of the measuring rod, and the inner diameter of the third inner cavity is matched with the outer diameter of the end part of the measuring rod.
4. A rock test piece surface normal displacement monitoring device according to claim 3, wherein the first lumen has a larger diameter than the second lumen and the second lumen has a larger diameter than the third lumen.
5. The rock specimen surface normal displacement monitoring device of claim 4, wherein the first cylinder side wall is provided with an exhaust passage for exhausting air brought in by the back and forth movement of the measuring rod out of the self-balancing hydraulic system.
6. The rock specimen surface normal displacement monitoring device of claim 1, wherein the displacement meter fixing plate is fixed on a triaxial pressure chamber, and a confining pressure chamber is formed between the triaxial pressure chamber and the rock specimen.
7. The rock specimen surface normal displacement monitoring device of claim 6, wherein the first self-balancing hydraulic system extends from the triaxial plenum through and into the confining plenum; the end part of a measuring rod of the first self-balancing hydraulic system is arranged in the confining pressure chamber;
the second self-balancing hydraulic system penetrates through the triaxial pressure chamber and stretches into the confining pressure chamber; and the end part of a measuring rod of the second self-balancing hydraulic system is arranged in the confining pressure chamber.
8. The device for monitoring the normal displacement of the surface of a rock test piece according to claim 7, wherein the measuring rod is in contact with the sealing sleeve, and the rock test piece is sleeved in the sealing sleeve.
9. A rock specimen surface normal displacement monitoring method based on the rock specimen surface normal displacement monitoring device according to any one of claims 1 to 8, comprising:
sleeving a rock test piece in a sealing sleeve to perform a test, and relatively contacting the rock test piece through a first self-balancing hydraulic system and a second self-balancing hydraulic system, wherein measuring rods of the first self-balancing hydraulic system and the second self-balancing hydraulic system are directly immersed in hydraulic oil in a confining pressure chamber and are contacted with the sealing sleeve; after hydraulic oil in the confining pressure chamber passes through the oil inlet of the measuring rod, the hydraulic oil reaches the self-balancing oil chamber through the diversion channel, so that the measuring rod is in a stress balance state;
the first and second self-balancing hydraulic systems each employ the self-balancing hydraulic system of any one of claims 1-5;
when the normal displacement of the rock test piece changes, the measuring rod of the first self-balancing hydraulic system and the measuring rod of the second self-balancing hydraulic system are driven to move, so that the first baffle plate and the second baffle plate are driven to move respectively, the displacement of the first self-balancing hydraulic system and the displacement of the second self-balancing hydraulic system are transmitted to the first displacement meter and the second displacement meter respectively through the first baffle plate and the second baffle plate, and the measured value of the first displacement meter and the measured value of the second displacement meter are the change value of the normal position of the rock test piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111602578.0A CN114264546B (en) | 2021-12-24 | 2021-12-24 | Self-balancing hydraulic system, rock test piece surface normal displacement monitoring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111602578.0A CN114264546B (en) | 2021-12-24 | 2021-12-24 | Self-balancing hydraulic system, rock test piece surface normal displacement monitoring device and method |
Publications (2)
| Publication Number | Publication Date |
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