CN114279856B - Huke pressure chamber for directly obtaining circumferential deformation of rock sample and facilitating replacement of rock sample - Google Patents
Huke pressure chamber for directly obtaining circumferential deformation of rock sample and facilitating replacement of rock sample Download PDFInfo
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- CN114279856B CN114279856B CN202111609227.2A CN202111609227A CN114279856B CN 114279856 B CN114279856 B CN 114279856B CN 202111609227 A CN202111609227 A CN 202111609227A CN 114279856 B CN114279856 B CN 114279856B
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- 239000011435 rock Substances 0.000 title claims abstract description 67
- 238000000926 separation method Methods 0.000 claims abstract description 35
- 230000001681 protective effect Effects 0.000 claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000002861 polymer material Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 28
- 238000012669 compression test Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 239000010720 hydraulic oil Substances 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
A Huke pressure chamber for directly obtaining rock sample circumferential deformation and facilitating rock sample replacement comprises a cylinder outside the pressure chamber, a cylinder inside the pressure chamber, a bottom plate of the pressure chamber, an upper pressure head, a lower pressure head, an oil separation protective sleeve and a loop chain type LVDT displacement sensor; the inner cylinder and the outer cylinder of the pressure chamber are of cylindrical structures and are vertically arranged, the outer cylinder of the pressure chamber is coaxially sleeved outside the inner cylinder of the pressure chamber, and sealing rings are arranged at the seams of cylinder openings at two sides of the outer cylinder of the pressure chamber; the bottom plate of the pressure chamber is horizontally and fixedly arranged at the bottom of the outer cylinder body in the pressure chamber; the central hole at the top end of the cylinder body in the pressure chamber is an upper pressure head mounting hole, and the upper pressure head is positioned in the mounting hole; the central hole at the bottom end of the cylinder in the pressure chamber is a lower pressure head mounting hole, and the lower pressure head is positioned in the mounting hole; the oil separation protective sleeve is coaxially arranged in the cylinder body in the pressure chamber, the top end sleeve opening of the oil separation protective sleeve is communicated with the upper pressure head mounting hole in a sealing way, and the bottom end sleeve opening of the oil separation protective sleeve is communicated with the lower pressure head mounting hole in a sealing way; the annular chain type LVDT displacement sensor is coaxially sleeved outside the oil separation protective sleeve.
Description
Technical Field
The invention belongs to the technical field of rock mechanics, and particularly relates to a Huke pressure chamber which is used for directly obtaining the circumferential deformation of a rock sample and is convenient for replacing the rock sample.
Background
The deep rock mass is a natural carrier of engineering objects such as underground mining, hydropower chamber excavation, unconventional mass energy exploitation, nuclear waste underground disposal and the like, the engineering excavation can change the initial stress state of the rock mass excavation boundary, and when the stress in the rock of the excavation boundary reaches the peak strength, the rock enters a post-peak deformation stage and finally is destroyed. The strength and deformation characteristics of the rock directly influence the damage area and the damage form of the rock mass, so the method has important significance for underground engineering design, stability evaluation and disaster prevention and control.
The stress-strain curve of the rock is a direct external reflection of strength and deformation characteristics, and is mainly obtained by carrying out uniaxial, biaxial, conventional triaxial and true triaxial compression tests through rock mechanical test equipment. Taking a conventional triaxial compression test as an example, the triaxial compression strength, deformation and other mechanical properties of the rock under different confining pressure conditions can be obtained, and the triaxial compression test is an important test means for drawing moire intensity envelope curves.
At present, a great number of conventional triaxial compression test researches on rocks are carried out by students at home and abroad, and conventional triaxial compression test devices with various forms are designed, but no matter how the forms of the conventional triaxial compression test devices are changed, a pressure chamber is required to be used, and the pressure chamber is an indispensable closed container for providing confining pressure for rock samples.
At present, the pressure chamber in the mainstream design generally adopts pressure chamber base and pressure chamber barrel separation dismouting structure, consequently after the experiment at every turn is accomplished, all need to drain the hydraulic oil in the pressure chamber earlier, later with pressure chamber barrel and pressure chamber base separation, just can carry out the rock sample at last and change to the test efficiency when leading to adopting traditional structure pressure chamber is lower. In addition, in order to avoid pollution of the rock sample by hydraulic oil during the test, the rock sample is wrapped by the heat shrinkage sleeve before the test, but from another angle, the rock sample wrapped by the heat shrinkage sleeve inevitably generates constraint on the rock sample to a certain extent, and the constraint can influence the strength and deformation of the rock sample, so that the reliability of the test result is adversely affected. Furthermore, in order to improve the test efficiency, the hooke pressure chamber with an integrated structure is continuously designed and developed, although the traditional hooke pressure chamber can avoid repeated hydraulic oil filling and discharging, the defect that the internal space of the pressure chamber is limited exists, so that when the traditional hooke pressure chamber is adopted for testing, only the point type displacement sensor can be used for measuring the circumferential deformation of the rock sample, but the actual circumferential deformation of the rock sample belongs to circumferential shear expansion, and the point type displacement sensor can cause measurement non-uniformity, so that the accuracy of a measurement result is reduced.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides the hooke pressure chamber which is used for directly acquiring the circumferential deformation of the rock sample and is convenient for replacing the rock sample, hydraulic oil is not required to be filled repeatedly, the circumferential deformation of the rock sample is measured by adopting the loop-chain displacement sensor, the replacement of the rock sample can be completed rapidly, and the test efficiency and the accuracy of the circumferential deformation measurement result can be improved effectively.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a Huke pressure chamber for directly obtaining rock sample circumferential deformation and facilitating rock sample replacement comprises a cylinder outside the pressure chamber, a cylinder inside the pressure chamber, a bottom plate of the pressure chamber, an upper pressure head, a lower pressure head, an oil separation protective sleeve and a loop chain type LVDT displacement sensor; the cylinder body outside the pressure chamber and the cylinder body inside the pressure chamber are both in cylindrical structures; the pressure chamber cylinder is vertically arranged, the pressure chamber cylinder is coaxially sleeved outside the pressure chamber cylinder, and sealing rings are arranged at the joints of cylinder ports on two sides of the pressure chamber cylinder and the pressure chamber cylinder; the bottom plate of the pressure chamber is horizontally and fixedly arranged at the bottoms of the cylinder outside the pressure chamber and the cylinder inside the pressure chamber; the top center hole of the cylinder in the pressure chamber is set as an upper pressure head mounting hole, and the upper pressure head is positioned in the upper pressure head mounting hole at the top of the cylinder in the pressure chamber; the bottom center hole of the cylinder in the pressure chamber is set as a lower pressure head mounting hole, and the lower pressure head is positioned in the lower pressure head mounting hole at the bottom end of the cylinder in the pressure chamber; the oil separation protective sleeve is coaxially arranged in the pressure chamber cylinder body, a top end sleeve opening of the oil separation protective sleeve is communicated with an upper pressure head mounting hole at the top end of the pressure chamber cylinder body in a sealing manner, and a bottom end sleeve opening of the oil separation protective sleeve is communicated with a lower pressure head mounting hole at the bottom end of the pressure chamber cylinder body in a sealing manner; the annular chain type LVDT displacement sensor is coaxially sleeved on the outer side of the oil separation protective sleeve.
And a process hole for installing an oil separation protective sleeve and a loop chain type LVDT displacement sensor is formed in the side part of the cylinder in the pressure chamber.
And a semi-cylindrical bracket for supporting the loop-chain type LVDT displacement sensor in the axial direction is arranged below the loop-chain type LVDT displacement sensor.
The oil separation protective sleeve is made of flexible high polymer materials.
An acoustic emission measuring hole is formed in the side of the upper pressure head mounting hole at the top end of the cylinder body in the pressure chamber, and the acoustic emission measuring hole is used for mounting an acoustic emission sensor.
And an exhaust hole is formed in the side of the upper pressure head mounting hole at the top end of the cylinder body in the pressure chamber.
And the side part of the cylinder body outside the pressure chamber is provided with an oil filling hole.
The side part of the cylinder body outside the pressure chamber is provided with a confining pressure measuring hole, and the confining pressure measuring hole is used for installing a pressure sensor.
The top end of the upper pressure head is coaxially and fixedly connected with a cushion block, and a straight rod type LVDT displacement sensor is connected between the cushion block and the bottom plate of the pressure chamber.
The pressure chamber cylinder and the pressure chamber cylinder are provided with lifting mechanisms, and the lifting mechanisms comprise jacks, adapter plates and lifting rods; the number of the jacks is two, the jacks are symmetrically distributed on two sides of the cylinder outside the pressure chamber in the radial direction, the jacks are vertically arranged, the piston rods face upwards, the adapter plate is horizontally and fixedly arranged on the top ends of the piston rods of the jacks, and the adapter plate is fixedly connected with the cylinder outside the pressure chamber and the cylinder inside the pressure chamber in a threaded connection mode; the lifting rod is vertically and fixedly arranged in the middle of the adapter plate, and the bottom end of the lifting rod is fixedly connected with the cushion block in a threaded manner.
The invention has the beneficial effects that:
According to the invention, the Huke pressure chamber for directly acquiring the rock sample circumferential deformation and facilitating replacement of the rock sample is not required to be filled with hydraulic oil repeatedly, the circumferential deformation of the rock sample is measured by adopting the loop-chain displacement sensor, the replacement of the rock sample can be completed rapidly, and the test efficiency and the accuracy of the circumferential deformation measurement result can be improved effectively.
Drawings
FIG. 1 is a perspective view of a Huke pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample according to the present invention;
FIG. 2 is a front view of a Huke pressure chamber for directly taking rock sample hoop deformation and facilitating replacement of the rock sample in accordance with the present invention;
FIG. 3 is a cross-sectional view of a Huke pressure chamber (lifting mechanism not shown) for directly taking rock sample hoop deformation and facilitating rock sample replacement of the present invention
In the figure, 1-a cylinder outside a pressure chamber, 2-a cylinder inside the pressure chamber, 3-a bottom plate of the pressure chamber, 4-an upper pressure head, 5-a lower pressure head, 6-an oil separation protective sleeve, 7-a loop chain type LVDT displacement sensor, 8-a sealing ring, 9-a process hole, 10-a semi-cylindrical support, 11-an acoustic emission measuring hole, 12-an exhaust hole, 13-an oil filling hole, 14-a confining pressure measuring hole, 15-a cushion block, 16-a straight rod type LVDT displacement sensor, 17-a jack, 18-an adapter plate, 19-a lifting rod and 20-a rock sample.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1 to 3, a hooke pressure chamber for directly obtaining the circumferential deformation of a rock sample and facilitating the replacement of the rock sample comprises a pressure chamber outer cylinder 1, a pressure chamber inner cylinder 2, a pressure chamber bottom plate 3, an upper pressure head 4, a lower pressure head 5, an oil separation protective sleeve 6 and a loop-chain type LVDT displacement sensor 7; the pressure chamber outer cylinder 1 and the pressure chamber inner cylinder 2 are both in cylindrical structures; the pressure chamber cylinder 2 is vertically arranged, the pressure chamber cylinder 1 is coaxially sleeved outside the pressure chamber cylinder 2, and sealing rings 8 are arranged at the joint of cylinder openings at two sides of the pressure chamber cylinder 2 and the pressure chamber cylinder 1; the pressure chamber bottom plate 3 is horizontally and fixedly arranged at the bottoms of the pressure chamber cylinder 1 and the pressure chamber cylinder 2; the top center hole of the cylinder body 2 in the pressure chamber is provided with an upper pressure head mounting hole, and the upper pressure head 4 is positioned in the upper pressure head mounting hole at the top end of the cylinder body 2 in the pressure chamber; the bottom center hole of the cylinder body 2 in the pressure chamber is provided with a lower pressure head mounting hole, and the lower pressure head 5 is positioned in the lower pressure head mounting hole at the bottom end of the cylinder body 2 in the pressure chamber; the oil separation protective sleeve 6 is coaxially arranged inside the pressure chamber cylinder 2, a sleeve opening at the top end of the oil separation protective sleeve 6 is communicated with an upper pressure head mounting hole at the top end of the pressure chamber cylinder 2 in a sealing manner, and a sleeve opening at the bottom end of the oil separation protective sleeve 6 is communicated with a lower pressure head mounting hole at the bottom end of the pressure chamber cylinder 2 in a sealing manner; the annular chain type LVDT displacement sensor 7 is coaxially sleeved outside the oil separation protective sleeve 6.
And a process hole 9 for installing the oil separation protective sleeve 6 and the endless chain type LVDT displacement sensor 7 is formed in the side part of the cylinder body 2 in the pressure chamber.
A semi-cylindrical support 10 for supporting the loop-chain type LVDT displacement sensor 7 in the axial direction is provided below the loop-chain type LVDT displacement sensor 7.
The oil separation protective sleeve 6 is made of flexible high polymer materials.
An acoustic emission measuring hole 11 is formed in the side of the upper pressure head mounting hole at the top end of the cylinder body 2 in the pressure chamber, and the acoustic emission measuring hole 11 is used for mounting an acoustic emission sensor.
An exhaust hole 12 is formed in the side of the upper pressure head mounting hole at the top end of the cylinder body 2 in the pressure chamber.
A charging and discharging hole 13 is provided at the side of the cylinder 1 outside the pressure chamber.
A confining pressure measuring hole 14 is formed in the side part of the pressure chamber outer cylinder body 1, and the confining pressure measuring hole 14 is used for installing a pressure sensor.
The top end of the upper pressure head 4 is coaxially and fixedly connected with a cushion block 15, and a straight rod type LVDT displacement sensor 16 is connected between the cushion block 15 and the pressure chamber bottom plate 3.
The pressure chamber cylinder 1 and the pressure chamber cylinder 2 are provided with lifting mechanisms, and the lifting mechanisms comprise jacks 17, adapter plates 18 and lifting rods 19; the number of the jacks 17 is two, the jacks 17 are symmetrically distributed on two sides of the cylinder 1 outside the pressure chamber in the radial direction, the jacks 17 are vertically arranged, the piston rods face upwards, the adapter plate 18 is horizontally and fixedly arranged on the top ends of the piston rods of the jacks 17, and the adapter plate 18 is fixedly connected with the cylinder 1 outside the pressure chamber and the cylinder 2 inside the pressure chamber in a screw connection mode; the lifting rod 19 is vertically and fixedly arranged in the middle of the adapter plate 18, and the bottom end of the lifting rod 19 is fixedly connected with the cushion block 15 in a threaded manner.
The following describes a one-time use procedure of the present invention with reference to the accompanying drawings:
When the conventional triaxial compression test device adopts the hooke pressure chamber, the hooke pressure chamber is required to be arranged right below the axial loading actuator. In the initial state, the hydraulic pressure control valve only comprises a combination body consisting of a cylinder body 1 outside a pressure chamber, a bottom plate 3 of the pressure chamber and a cylinder body 2 inside the pressure chamber, wherein an oil separation protective sleeve 6 and a loop chain type LVDT displacement sensor 7 are installed on the combination body.
In the embodiment, the diameter of the upper pressure head mounting hole at the top end of the cylinder body 2 in the pressure chamber is phi 50 mm-phi 52mm, the diameter of the lower pressure head mounting hole at the bottom end of the cylinder body 2 in the pressure chamber is phi 55 mm-phi 57mm, and after the rock sample 20 is damaged, the rock sample 20 is conveniently taken out from the lower pressure head mounting hole. The rock sample 20 was a cylindrical standard sample having a diameter of 50mm and a height of 100mm, the maximum confining pressure of the pressure chamber was set to 100MPa, and the maximum axial pressure was set to 2000kN.
Firstly, controlling piston rods of the jacks 17 on two sides of the cylinder 1 outside the pressure chamber to extend upwards, fixedly connecting the adapter plate 18 to the top ends of the piston rods of the jacks 17 through bolts, then controlling the piston rods of the jacks 17 to retract until the adapter plate 18 descends and is lapped on the cylinder 1 outside the pressure chamber, and fixedly connecting the adapter plate 18 with the cylinder 1 outside the pressure chamber through bolts. And then the piston rod of the jack 17 is controlled to extend upwards, the combined body is lifted through the adapter plate 18, the lifting height is larger than the height of the lower pressure head 5, after the lifting height of the combined body meets the requirement, the upward extension of the piston rod of the jack 17 is stopped, and the prepared lower pressure head 5 is placed under the lower pressure head mounting hole at the bottom end of the cylinder 2 in the pressure chamber. After the lower pressure head 5 is placed, the piston rod of the jack 17 is controlled to retract downwards until the lower pressure head 5 completely enters the lower pressure head mounting hole.
After the installation of the lower pressure head 5 is finished, the adapter plate 18 is removed, and the piston rod of the control jack 17 is retracted to the initial position. And then the surface of the prepared rock sample 20 is subjected to antifriction treatment, and then the rock sample 20 subjected to antifriction treatment is placed into an oil separation protective sleeve 6 through an upper pressure head mounting hole at the top end of the cylinder 2 in the pressure chamber, so that the lower end face of the rock sample 20 is propped against the upper surface of the lower pressure head 5. After the rock sample 20 is placed in the oil separation protective sleeve 6, the upper pressure head 4 is inserted into the upper pressure head mounting hole at the top end of the cylinder 2 in the pressure chamber until the lower surface of the upper pressure head 4 is in abutting contact with the upper surface of the rock sample 20 in the oil separation protective sleeve 6.
After the rock sample 20 and the upper pressure head 4 are installed, a pressure sensor is installed in the confining pressure measuring hole 14 at the side part of the pressure chamber cylinder 1, then an acoustic emission sensor is installed in the acoustic emission measuring hole 11 at the top end of the pressure chamber cylinder 2, then the oil filling hole 13 at the side part of the pressure chamber cylinder 1 is connected into a confining pressure loading system, hydraulic oil is filled into a cavity between the pressure chamber cylinder 1 and the pressure chamber cylinder 2 through the oil filling hole 13, air in the cavity in the oil filling process is discharged through the exhaust hole 12 at the top end of the pressure chamber cylinder 2 until hydraulic oil overflows in the exhaust hole 12, oil filling is stopped, and the exhaust hole 12 is closed.
After the pressure chamber is filled with oil, a cushion block 15 is installed above the upper pressure head 4, and then a straight rod type LVDT displacement sensor 16 is installed on the cushion block 15 and the pressure chamber bottom plate 3. The piston rod of the axially loaded actuator is then controlled to move downwards until the actuator piston rod abuts against the spacer 15.
When the preparation work is completed, axial load is applied through the axial loading actuator, confining pressure is applied through the confining pressure loading system, axial deformation of the rock sample 20 is measured through the straight rod type LVDT displacement sensor 16, annular deformation of the rock sample 20 is measured through the annular chain type LVDT displacement sensor 7, acoustic emission signals of the rock sample 20 are measured through the acoustic emission sensor, and when the compression of the rock sample 20 is broken, the compression test is finished.
After the compression test is finished, the confining pressure is firstly unloaded through the confining pressure loading system, then the axial load is unloaded through the axial loading actuator, the piston rod of the actuator is controlled to retract to the initial position after the axial load is unloaded, then the straight rod type LVDT displacement sensor 16 is dismounted, then the lifting rod 19 is fixedly connected to the cushion block 15 in a threaded manner, the lifting rod 19 is pulled upwards, and the lifting force is transmitted through the cushion block 15 until the upper pressure head 4 is pulled out from the pressure head mounting hole on the top end of the cylinder body 2 in the pressure chamber.
When the upper pressure head 4 is disassembled, the piston rods of the jacks 17 on the two sides of the cylinder 1 outside the pressure chamber are controlled to extend upwards, then the adapter plate 18 is fixed to the top ends of the piston rods of the jacks 17 again through bolts, then the piston rods of the jacks 17 are controlled to retract until the adapter plate 18 descends and is lapped on the cylinder 1 outside the pressure chamber, and then the adapter plate 18 is fixedly connected with the cylinder 1 outside the pressure chamber through bolts. And then the piston rod of the control jack 17 extends upwards, and then the pressure chamber is integrally lifted through the adapter plate 18, at the moment, the lower pressure head 5 is gradually exposed from the lower pressure head mounting hole at the bottom end of the cylinder 2 in the pressure chamber, when the integral lifting height of the pressure chamber is larger than the height of the lower pressure head 5, the lifting is stopped, then the completely exposed lower pressure head 5 is removed, along with the removal of the lower pressure head 5, the crushed rock sample 20 in the oil separation protective sleeve 6 is also completely discharged through the lower pressure head mounting hole at the bottom end of the cylinder 2 in the pressure chamber, and then the crushed rock sample 20 is cleaned.
When the broken rock sample 20 is cleaned, the lower pressure head 5 is placed under the lower pressure head mounting hole at the bottom end of the cylinder 2 in the pressure chamber again, then the piston rod of the jack 17 is controlled to retract downwards until the lower pressure head 5 completely enters the lower pressure head mounting hole, then the adapter plate 18 is removed, the piston rod of the jack 17 is controlled to retract to the initial position, then the brand new antifriction-treated rock sample 20 is placed into the oil separation protective sleeve 6 through the upper pressure head mounting hole at the top end of the cylinder 2 in the pressure chamber, then the cushion block 15 and the upper pressure head 4 are sent back to the upper pressure head mounting hole at the top end of the cylinder 2 in the pressure chamber through the lifting rod 19, then the lifting rod 19 is removed, and then the straight rod type LVDT displacement sensor 16 is reloaded between the cushion block 15 and the bottom plate 3 of the pressure chamber.
When the preparation work is completed, the axial load can be applied again through the axial loading actuator, and meanwhile, the confining pressure is applied through the confining pressure loading system, so that a new rock compression test can be continuously carried out.
The embodiments are not intended to limit the scope of the invention, but rather are intended to cover all equivalent implementations or modifications that can be made without departing from the scope of the invention.
Claims (1)
1. A huke pressure chamber for directly obtaining rock specimen hoop deformation and be convenient for change rock specimen, its characterized in that: the device comprises a pressure chamber outer cylinder, a pressure chamber inner cylinder, a pressure chamber bottom plate, an upper pressure head, a lower pressure head, an oil separation protective sleeve and a loop chain type LVDT displacement sensor; the cylinder body outside the pressure chamber and the cylinder body inside the pressure chamber are both in cylindrical structures; the pressure chamber cylinder is vertically arranged, the pressure chamber cylinder is coaxially sleeved outside the pressure chamber cylinder, and sealing rings are arranged at the joints of cylinder ports on two sides of the pressure chamber cylinder and the pressure chamber cylinder; the bottom plate of the pressure chamber is horizontally and fixedly arranged at the bottoms of the cylinder outside the pressure chamber and the cylinder inside the pressure chamber; the top center hole of the cylinder in the pressure chamber is set as an upper pressure head mounting hole, and the upper pressure head is positioned in the upper pressure head mounting hole at the top of the cylinder in the pressure chamber; the bottom center hole of the cylinder in the pressure chamber is set as a lower pressure head mounting hole, and the lower pressure head is positioned in the lower pressure head mounting hole at the bottom end of the cylinder in the pressure chamber; the oil separation protective sleeve is coaxially arranged in the pressure chamber cylinder body, a top end sleeve opening of the oil separation protective sleeve is communicated with an upper pressure head mounting hole at the top end of the pressure chamber cylinder body in a sealing manner, and a bottom end sleeve opening of the oil separation protective sleeve is communicated with a lower pressure head mounting hole at the bottom end of the pressure chamber cylinder body in a sealing manner; the annular chain type LVDT displacement sensor is coaxially sleeved outside the oil separation protective sleeve; a process hole for installing an oil separation protective sleeve and a loop chain type LVDT displacement sensor is formed in the side part of the cylinder in the pressure chamber; a semi-cylindrical bracket for supporting the loop-chain type LVDT displacement sensor in the axial direction is arranged below the loop-chain type LVDT displacement sensor; the oil separation protective sleeve is made of flexible high polymer materials; an acoustic emission measuring hole is formed in the side of an upper pressure head mounting hole at the top end of the cylinder in the pressure chamber, and the acoustic emission measuring hole is used for mounting an acoustic emission sensor; a confining pressure measuring hole is formed in the side part of the cylinder outside the pressure chamber, and is used for installing a pressure sensor; the top end of the upper pressure head is coaxially and fixedly connected with a cushion block, and a straight rod type LVDT displacement sensor is connected between the cushion block and the bottom plate of the pressure chamber; an exhaust hole is formed in the side of the upper pressure head mounting hole at the top end of the cylinder in the pressure chamber; the side part of the cylinder body outside the pressure chamber is provided with an oil filling hole; the pressure chamber cylinder and the pressure chamber cylinder are provided with lifting mechanisms, and the lifting mechanisms comprise jacks, adapter plates and lifting rods; the number of the jacks is two, the jacks are symmetrically distributed on two sides of the cylinder outside the pressure chamber in the radial direction, the jacks are vertically arranged, the piston rods face upwards, the adapter plate is horizontally and fixedly arranged on the top ends of the piston rods of the jacks, and the adapter plate is fixedly connected with the cylinder outside the pressure chamber and the cylinder inside the pressure chamber in a threaded connection mode; the lifting rod is vertically and fixedly arranged in the middle of the adapter plate, and the bottom end of the lifting rod is fixedly connected with the cushion block in a threaded manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111609227.2A CN114279856B (en) | 2021-12-27 | 2021-12-27 | Huke pressure chamber for directly obtaining circumferential deformation of rock sample and facilitating replacement of rock sample |
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| CN202111609227.2A CN114279856B (en) | 2021-12-27 | 2021-12-27 | Huke pressure chamber for directly obtaining circumferential deformation of rock sample and facilitating replacement of rock sample |
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| CN114279856A CN114279856A (en) | 2022-04-05 |
| CN114279856B true CN114279856B (en) | 2024-06-11 |
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