CN114279856A - Hooke pressure chamber for directly obtaining circumferential deformation of rock sample and facilitating replacement of rock sample - Google Patents
Hooke pressure chamber for directly obtaining circumferential deformation of rock sample and facilitating replacement of rock sample Download PDFInfo
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- CN114279856A CN114279856A CN202111609227.2A CN202111609227A CN114279856A CN 114279856 A CN114279856 A CN 114279856A CN 202111609227 A CN202111609227 A CN 202111609227A CN 114279856 A CN114279856 A CN 114279856A
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- 239000011435 rock Substances 0.000 title claims abstract description 85
- 230000001681 protective effect Effects 0.000 claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims abstract description 32
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000002861 polymer material Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 26
- 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 3
- 238000003825 pressing Methods 0.000 description 3
- 238000013461 design 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
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000004519 manufacturing process 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
- 230000009467 reduction Effects 0.000 description 1
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- 238000010008 shearing Methods 0.000 description 1
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Abstract
A hooke pressure chamber for directly obtaining the circumferential deformation of a rock sample and facilitating the replacement of the rock sample comprises an outer pressure chamber cylinder body, an inner pressure chamber cylinder body, a pressure chamber bottom plate, an upper pressure head, a lower pressure head, an oil separation protective sleeve and a ring chain type LVDT displacement sensor; the pressure chamber inner and outer cylinder bodies are of cylindrical structures and are vertically arranged, the pressure chamber outer cylinder body is coaxially sleeved on the outer side of the pressure chamber inner cylinder body, and sealing rings are arranged at the seam joints of the cylinder mouths on the two sides of the pressure chamber inner and outer cylinder bodies; the pressure chamber bottom plate is horizontally and fixedly arranged at the bottom of the inner and outer cylinder bodies of the pressure chamber; a central hole at the top end of the cylinder in the pressure chamber is an upper pressure head mounting hole, and the upper pressure head is positioned in the mounting hole; a central hole at the bottom end of the cylinder body 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 pressure chamber barrel, a sleeve opening at the top end of the oil separation protective sleeve is communicated with the upper pressure head mounting hole in a sealing manner, and a sleeve opening at the bottom end of the oil separation protective sleeve is communicated with the lower pressure head mounting hole in a sealing manner; the chain type LVDT displacement sensor is coaxially sleeved on the outer side of the oil separation protective sleeve.
Description
Technical Field
The invention belongs to the technical field of rock mechanics, and particularly relates to a hooke pressure chamber which is used for directly obtaining 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, hydroelectric underground chamber excavation, unconventional geological energy exploitation, nuclear waste underground disposal and the like, the initial stress state of the rock mass excavation boundary can be changed through the engineering excavation, and when the stress in the excavation boundary rock reaches the peak intensity, the rock enters the post-peak deformation stage and is finally damaged. The strength and deformation characteristics of the rock directly influence the damage area and the damage form of the rock, 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 on rock mechanics test equipment. Taking a conventional triaxial compression test as an example, the mechanical properties such as triaxial compression strength and deformation of the rock under different confining pressure conditions can be obtained, and the method is an important test means for drawing a Moire intensity envelope curve.
At present, a large number of conventional triaxial compression test researches on rocks are carried out by scholars 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 stage, the pressure chamber in the mainstream design generally adopts pressure chamber base and pressure chamber barrel separation dismouting structure, consequently after experimental at every turn, all need be with the hydraulic oil in the pressure chamber clean, later with pressure chamber barrel and pressure chamber base separation, just can carry out the rock specimen at last and change to test efficiency when leading to adopting traditional structure pressure chamber is lower. In addition, in the test process, in order to avoid the pollution of the rock sample by hydraulic oil, the rock sample is wrapped by the thermal shrinkage sleeve before the test, but from another perspective, the rock sample wrapped by the thermal shrinkage sleeve is bound to a certain extent, and the bound can affect the strength and the 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 that adopts the integral type structure is constantly being designed and developed, though traditional hooke pressure chamber can avoid the repeated hydraulic oil that fills and arrange, but there is the limited defect in pressure chamber inner space, when leading to adopting traditional hooke pressure chamber to test, can only adopt point type displacement sensor to measure the hoop deformation of rock specimen, but the actual hoop deformation of rock specimen belongs to circumference shearing expansion, and point type displacement sensor can cause the measuring inhomogeneous, lead to the reduction of measuring result accuracy.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the hooke pressure chamber which is used for directly obtaining the circumferential deformation of the rock sample and is convenient for replacing the rock sample, hydraulic oil is not required to be repeatedly filled and discharged, the circumferential deformation of the rock sample is measured by adopting the ring chain type displacement sensor, the replacement of the rock sample can be quickly completed, and the test efficiency and the accuracy of the circumferential deformation measurement result can be effectively improved.
In order to achieve the purpose, the invention adopts the following technical scheme: a hooke pressure chamber for directly obtaining the circumferential deformation of a rock sample and facilitating the replacement of the rock sample comprises an outer pressure chamber cylinder body, an inner pressure chamber cylinder body, a pressure chamber bottom plate, an upper pressure head, a lower pressure head, an oil separation protective sleeve and a ring chain type LVDT displacement sensor; the pressure chamber outer cylinder body and the pressure chamber inner cylinder body both adopt cylindrical structures; the pressure chamber barrel is vertically arranged, the pressure chamber outer barrel is coaxially sleeved on the outer side of the pressure chamber barrel, and sealing rings are arranged at the seams of the barrel openings on the two sides of the pressure chamber outer barrel and the pressure chamber inner barrel; the pressure chamber bottom plate is horizontally and fixedly arranged at the bottom of the pressure chamber outer cylinder body and the bottom of the pressure chamber inner cylinder body; a center hole at the top end of the cylinder in the pressure chamber is provided with an upper pressure head mounting hole, and the upper pressure head is positioned in the upper pressure head mounting hole at the top end of the cylinder in the pressure chamber; a central hole at the bottom end 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 barrel, a sleeve opening at the top end of the oil separation protective sleeve is in sealing communication with an upper pressure head mounting hole at the top end of the pressure chamber barrel, and a sleeve opening at the bottom end of the oil separation protective sleeve is in sealing communication with a lower pressure head mounting hole at the bottom end of the pressure chamber barrel; the 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 ring chain type LVDT displacement sensor is formed in the side part of the cylinder body in the pressure chamber.
And a semi-cylindrical support used 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 removal protective sleeve is made of flexible high polymer materials.
And an acoustic emission measuring hole is formed in the side of the upper pressure head mounting hole in the top end of the cylinder body in the pressure chamber and 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 pressure chamber outer cylinder is provided with an oil filling and discharging hole.
And the lateral part of the pressure chamber outer cylinder body is provided with a confining pressure measuring hole, and the confining pressure measuring hole is used for installing a pressure sensor.
And a cushion block is coaxially and fixedly connected to the top end of the upper pressure head, and a straight rod type LVDT displacement sensor is connected between the cushion block and the pressure chamber bottom plate.
The pressure chamber outer cylinder and the pressure chamber inner 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 pressure chamber outer cylinder body along the radial direction, the jacks are vertically arranged, piston rods are upward, the adapter plate is horizontally and fixedly installed at the top ends of the piston rods of the jacks, and the adapter plate is in threaded connection and fixed connection with the pressure chamber outer cylinder body and the pressure chamber inner cylinder body; the lifting rod is vertically and fixedly arranged in the middle of the adapter plate, and the bottom end of the lifting rod is in threaded connection with the cushion block and is fixedly matched with the cushion block.
The invention has the beneficial effects that:
the Hooke pressure chamber is used for directly obtaining the circumferential deformation of the rock sample and is convenient for replacing the rock sample, repeated filling and draining of hydraulic oil are not needed, the ring chain type displacement sensor is adopted for measuring the circumferential deformation of the rock sample, the replacement of the rock sample can be quickly completed, and the test efficiency and the accuracy of the circumferential deformation measurement result can be effectively improved.
Drawings
FIG. 1 is a perspective view of a hooke pressure chamber of the present invention for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample;
FIG. 2 is a front view of a hooke's pressure chamber of the present invention for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample;
FIG. 3 is a cross-sectional view of a hooke's pressure chamber (lifting mechanism not shown) of the present invention for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample
In the figure, 1-pressure chamber outer cylinder, 2-pressure chamber inner cylinder, 3-pressure chamber bottom plate, 4-upper pressure head, 5-lower pressure head, 6-oil separation protective sleeve, 7-ring chain type LVDT displacement sensor, 8-sealing ring, 9-fabrication hole, 10-semi-cylindrical support, 11-acoustic emission measurement hole, 12-exhaust hole, 13-oil filling and discharging hole, 14-confining pressure measurement hole, 15-cushion block, 16-straight rod type LVDT displacement sensor, 17-jack, 18-adapter plate, 19-lifting rod and 20-rock sample.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
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 an outer pressure chamber cylinder 1, an inner pressure chamber 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 ring chain type LVDT displacement sensor 7; the pressure chamber outer cylinder body 1 and the pressure chamber inner cylinder body 2 both adopt cylindrical structures; the pressure chamber barrel 2 is vertically arranged, the pressure chamber outer barrel 1 is coaxially sleeved on the outer side of the pressure chamber barrel 2, and sealing rings 8 are arranged at the seams of the barrel openings at the two sides of the pressure chamber outer barrel 1 and the pressure chamber inner barrel 2; the pressure chamber bottom plate 3 is horizontally and fixedly arranged at the bottom of the pressure chamber outer cylinder 1 and the pressure chamber inner cylinder 2; a center hole at the top end of the cylinder 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 2 in the pressure chamber; a central hole at the bottom end of the cylinder 2 in the pressure chamber is set as 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 2 in the pressure chamber; the oil separation protective sleeve 6 is coaxially arranged inside the barrel 2 in the pressure chamber, a sleeve opening at the top end of the oil separation protective sleeve 6 is in sealed communication with a pressure head mounting hole in the top end of the barrel 2 in the pressure chamber, and a sleeve opening at the bottom end of the oil separation protective sleeve 6 is in sealed communication with a lower pressure head mounting hole in the bottom end of the barrel 2 in the pressure chamber; and the ring chain type LVDT displacement sensor 7 is coaxially sleeved on the outer side of the oil separation protective sleeve 6.
And a process hole 9 for installing an oil separation protective sleeve 6 and a ring 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 arranged below the loop chain type LVDT displacement sensor 7.
The oil-separating protective sleeve 6 is made of flexible high polymer materials.
An acoustic emission measuring hole 11 is formed in the side of an upper pressure head mounting hole in the top end of the cylinder 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 arranged on the side of the upper pressure head mounting hole at the top end of the cylinder 2 in the pressure chamber.
And an oil filling and discharging hole 13 is formed in the side part of the pressure chamber outer cylinder 1.
And 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 outer cylinder 1 and the pressure chamber inner 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 pressure chamber outer cylinder 1 along the radial direction, the jacks 17 are vertically arranged, piston rods face upwards, the adapter plate 18 is horizontally and fixedly installed at the top end of the piston rod of the jack 17, and the adapter plate 18 is in threaded connection and fixed connection with the pressure chamber outer cylinder 1 and the pressure chamber inner cylinder 2; 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 in threaded connection and fixed connection with the cushion block 15.
The one-time use process of the present invention is described below with reference to the accompanying drawings:
when the hooke pressure chamber of the present invention is used in a conventional triaxial compression test apparatus, the hooke pressure chamber of the present invention needs to be positioned directly below the axial loading actuator. In the initial state, the device only comprises a combination body consisting of the pressure chamber outer cylinder body 1, the pressure chamber bottom plate 3, and the pressure chamber inner cylinder body 2 provided with the oil separation protective sleeve 6 and the ring chain type LVDT displacement sensor 7.
In the embodiment, the diameter of the upper pressure head mounting hole at the top end of the barrel 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 barrel 2 in the pressure chamber is phi 55 mm-phi 57mm, and after the rock sample 20 is damaged, the rock sample 20 can be conveniently taken out from the lower pressure head mounting hole. The rock sample 20 is a cylindrical standard sample with a diameter of 50mm and a height of 100mm, the maximum confining pressure of the pressure chamber is set to 100MPa, and the maximum axial pressure is set to 2000 kN.
Firstly, the piston rods of the jacks 17 on the two sides of the pressure chamber outer cylinder 1 are controlled to extend upwards, then the adapter plate 18 is fixedly connected to the top ends of the piston rods of the jacks 17 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 pressure chamber outer cylinder 1, and then the adapter plate 18 is fixedly connected with the pressure chamber outer cylinder 1 through bolts. Afterwards, the piston rod of the jack 17 is controlled to extend upwards, the assembly is raised through the adapter plate 18, the raising height is larger than the height of the lower pressure head 5, after the assembly is raised to reach the requirement, the upward extension of the piston rod of the jack 17 is stopped, and the prepared lower pressure head 5 is arranged in the pressure chamber under the bottom end lower pressure head mounting hole of the cylinder body 2. After the lower pressing head 5 is placed, the piston rod of the jack 17 is controlled to retract downwards until the lower pressing head 5 completely enters the lower pressing head mounting hole.
After the lower pressure head 5 is installed, the adapter plate 18 is removed, and the piston rod of the jack 17 is controlled to retract to the initial position. And then, firstly performing antifriction treatment on the surface of the prepared rock sample 20, and then putting the rock sample 20 subjected to antifriction treatment into the oil-separation protective sleeve 6 through a pressure head mounting hole in the top end of the cylinder 2 in the pressure chamber, so that the lower end face of the rock sample 20 is abutted against the upper surface of the lower pressure head 5. After the rock sample 20 is placed into 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 barrel 2 in the pressure chamber until the lower surface of the upper pressure head 4 is abutted against and contacted with the upper surface of the rock sample 20 inside 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 a confining pressure measuring hole 14 on the side portion of the pressure chamber outer cylinder 1, then an acoustic emission sensor is installed in an acoustic emission measuring hole 11 on the top end of the pressure chamber inner cylinder 2, then an oil filling and discharging hole 13 on the side portion of the pressure chamber outer cylinder 1 is connected to a confining pressure loading system, hydraulic oil is filled into a cavity between the pressure chamber outer cylinder 1 and the pressure chamber inner cylinder 2 through the oil filling and discharging hole 13, air in the cavity in the oil filling process is discharged through an exhaust hole 12 on the top end of the pressure chamber inner cylinder 2 until the hydraulic oil overflows in the exhaust hole 12, oil filling is stopped, and the exhaust hole 12 is closed.
After the pressure chamber finishes oil filling, 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 axial loading actuator is then controlled to move downwards until the piston rod of the actuator abuts against the pad 15.
After the preparation work is completely finished, an axial load is applied through the axial loading actuator, meanwhile, confining pressure is applied through the confining pressure loading system, in the process of performing a compression test on the rock sample 20, the axial deformation of the rock sample 20 is measured through the straight rod type LVDT displacement sensors 16, the annular deformation of the rock sample 20 is measured through the annular chain type LVDT displacement sensors 7, the acoustic emission signals of the rock sample 20 are measured through the acoustic emission sensors, and after the rock sample 20 is compressed and damaged, the compression test is finished.
After the compression test is finished, firstly, confining pressure is unloaded through a confining pressure loading system, then, axial load is unloaded through an axial loading actuator, a piston rod of the actuator is controlled to retract to an initial position after the axial load is unloaded, then, a straight rod type LVDT displacement sensor 16 is detached, then, a lifting rod 19 is fixedly connected to a cushion block 15 in a threaded mode, the lifting rod 19 is pulled upwards, and pulling force is lifted through transmission of the cushion block 15 until an upper pressure head 4 is pulled out from a pressure head mounting hole in the top end of a cylinder body 2 in a pressure chamber.
After the upper pressure head 4 is disassembled, the piston rods of the jacks 17 on the two sides of the pressure chamber outer cylinder 1 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 in lap joint with the pressure chamber outer cylinder 1, and then the adapter plate 18 is fixedly connected with the pressure chamber outer cylinder 1 through bolts. Afterwards, the piston rod of the control jack 17 upwards extends out, and then the whole pressure chamber is lifted up 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 barrel body 2 in the pressure chamber, the pressure chamber stops lifting after the whole lifting height of the pressure chamber is greater than the height of the lower pressure head 5, then the completely exposed lower pressure head 5 is removed, along with the removal of the lower pressure head 5, the inside broken rock sample 20 of the oil separation protective sleeve 6 can be completely discharged through the lower pressure head mounting hole at the bottom end of the barrel body 2 in the pressure chamber, and then the broken rock sample 20 is cleaned up.
After the broken rock sample 20 is cleaned up, the lower pressure head 5 is placed under the lower pressure head mounting hole at the bottom end of the barrel 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 and the piston rod of the jack 17 is controlled to retract to the initial position, then the brand-new rock sample 20 subjected to antifriction treatment is placed into the oil-proof protective sleeve 6 through the upper pressure head mounting hole at the top end of the barrel 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 barrel 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 installed back between the cushion block 15 and the bottom plate 3 of the pressure chamber again.
After the preparation work is completely finished, the axial load can be applied through the axial loading actuator again, the confining pressure is applied through the confining pressure loading system, and a new rock compression test is continuously carried out.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a hooke pressure chamber that is used for directly obtaining the rock specimen hoop deformation and is convenient for change the rock specimen which 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 ring chain type LVDT displacement sensor; the pressure chamber outer cylinder body and the pressure chamber inner cylinder body both adopt cylindrical structures; the pressure chamber barrel is vertically arranged, the pressure chamber outer barrel is coaxially sleeved on the outer side of the pressure chamber barrel, and sealing rings are arranged at the seams of the barrel openings on the two sides of the pressure chamber outer barrel and the pressure chamber inner barrel; the pressure chamber bottom plate is horizontally and fixedly arranged at the bottom of the pressure chamber outer cylinder body and the bottom of the pressure chamber inner cylinder body; a center hole at the top end of the cylinder in the pressure chamber is provided with an upper pressure head mounting hole, and the upper pressure head is positioned in the upper pressure head mounting hole at the top end of the cylinder in the pressure chamber; a central hole at the bottom end 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 barrel, a sleeve opening at the top end of the oil separation protective sleeve is in sealing communication with an upper pressure head mounting hole at the top end of the pressure chamber barrel, and a sleeve opening at the bottom end of the oil separation protective sleeve is in sealing communication with a lower pressure head mounting hole at the bottom end of the pressure chamber barrel; the chain type LVDT displacement sensor is coaxially sleeved on the outer side of the oil separation protective sleeve.
2. A hooke's pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample as recited in claim 1, wherein: and a process hole for installing an oil separation protective sleeve and a ring chain type LVDT displacement sensor is formed in the side part of the cylinder body in the pressure chamber.
3. A hooke's pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample as recited in claim 1, wherein: and a semi-cylindrical support used for supporting the loop chain type LVDT displacement sensor in the axial direction is arranged below the loop chain type LVDT displacement sensor.
4. A hooke's pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample as recited in claim 1, wherein: the oil removal protective sleeve is made of flexible high polymer materials.
5. A hooke's pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample as recited in claim 1, wherein: and an acoustic emission measuring hole is formed in the side of the upper pressure head mounting hole in the top end of the cylinder body in the pressure chamber and is used for mounting an acoustic emission sensor.
6. A hooke's pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample as recited in claim 1, wherein: 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.
7. A hooke's pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample as recited in claim 1, wherein: and the side part of the pressure chamber outer cylinder is provided with an oil filling and discharging hole.
8. A hooke's pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample as recited in claim 1, wherein: and the lateral part of the pressure chamber outer cylinder body is provided with a confining pressure measuring hole, and the confining pressure measuring hole is used for installing a pressure sensor.
9. A hooke's pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample as recited in claim 1, wherein: and a cushion block is coaxially and fixedly connected to the top end of the upper pressure head, and a straight rod type LVDT displacement sensor is connected between the cushion block and the pressure chamber bottom plate.
10. A hooke's pressure chamber for directly acquiring circumferential deformation of a rock sample and facilitating replacement of the rock sample as recited in claim 9, wherein: the pressure chamber outer cylinder and the pressure chamber inner 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 pressure chamber outer cylinder body along the radial direction, the jacks are vertically arranged, piston rods are upward, the adapter plate is horizontally and fixedly installed at the top ends of the piston rods of the jacks, and the adapter plate is in threaded connection and fixed connection with the pressure chamber outer cylinder body and the pressure chamber inner cylinder body; the lifting rod is vertically and fixedly arranged in the middle of the adapter plate, and the bottom end of the lifting rod is in threaded connection with the cushion block and is fixedly matched with the cushion block.
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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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| CN114279856B CN114279856B (en) | 2024-06-11 |
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