CN113866223B - Sealing device and method for high-pressure triaxial resistivity test sample - Google Patents
Sealing device and method for high-pressure triaxial resistivity test sample Download PDFInfo
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- CN113866223B CN113866223B CN202111133016.6A CN202111133016A CN113866223B CN 113866223 B CN113866223 B CN 113866223B CN 202111133016 A CN202111133016 A CN 202111133016A CN 113866223 B CN113866223 B CN 113866223B
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- 238000007789 sealing Methods 0.000 title claims abstract description 177
- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 68
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 239000011435 rock Substances 0.000 claims abstract description 18
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 230000009471 action Effects 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 229920001971 elastomer Polymers 0.000 claims description 34
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000000741 silica gel Substances 0.000 claims description 13
- 229910002027 silica gel Inorganic materials 0.000 claims description 13
- 238000005086 pumping Methods 0.000 claims description 9
- 239000000565 sealant Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 229940099259 vaseline Drugs 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 239000004816 latex Substances 0.000 description 12
- 229920000126 latex Polymers 0.000 description 12
- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a sealing device and a method for a high-pressure triaxial resistivity test sample, which comprises a first sealing shell, a second sealing shell, an elastic casing, a disc-shaped base plate and a screw rod, wherein an upper pressure head, the sample and a lower pressure head are coaxially arranged to form a combined body, and the elastic casing is sleeved on the outer surface of the sample; placing the combined body between the first sealing shell and the second sealing shell, pressing and fixing the combined body through the disc-shaped base plate and the upper end cover, and finally splicing the upper end cover, the lower end cover, the first sealing shell and the second sealing shell into a cylinder to form a sealed space inside the cylinder; vacuumizing from the exhaust hole, filling sealing liquid into the cylinder through the liquid injection hole under the action of atmosphere, and forming a wrapped sealing layer outside the rock sample after the sealing liquid is hardened; when the sample is deformed under pressure, the elastic casing can deform correspondingly, so that the elastic casing and the sample are ensured to deform in a coordinated manner, and leakage of confining pressure liquid caused by inconsistent deformation is avoided; and finally, the measurement result precision of the subsequent sample subjected to the high-pressure triaxial resistivity test and the seepage test is higher.
Description
Technical Field
The invention relates to a sealing device and method for a high-pressure triaxial resistivity test sample, and belongs to the technical field of triaxial loading tests.
Background
In a triaxial test, three-dimensional resistivity imaging can be used for researching the change rule of the resistivity of a sample in different stress states.
However, because of the existence of the electrode and the wire on the surface of the sample, the sealing of the sample is the first problem to be considered, and the method mainly adopted at present is to wrap a thickened latex film for sealing on the outer surface of the sample, attach the electrode to the inner wall of the latex film, then penetrate the wire out of the latex film and cure the sealing wire hole with liquid glue. However, the deformation of the sample drives the deformation of the latex film in the triaxial loading test process, and the sealing effect is invalid due to the inconsistent deformation between the solidified liquid glue and the latex film; meanwhile, because the latex film cannot be completely attached to the surface of the sample, if liquid exists in the sample, the liquid can be gathered in a gap between the surface of the sample and the latex film in the test process, and therefore insulation between electrodes is affected. And the electrode is pasted on the inner wall of the latex film and is contacted with the surface of the sample through the confining pressure outside the latex film, and the electrode is easy to generate dislocation when the pressure inside and outside the latex film changes, so that poor contact is caused. In addition, certain cracks are inevitably generated at the contact surfaces of the rock and the upper and lower pressure heads, and when the confining pressure in the test is higher, the latex film is possibly punctured, so that the sealing failure is caused; or when the rock surface has larger cracks, the latex film is broken down. Therefore, how to seal a sample for triaxial resistivity test to enable the sealing layer to be tightly attached to the surface of the sample is a research direction of the industry, and the sample can deform along with corresponding deformation when being pressed, so that the two deformation are coordinated, and the occurrence of the cracking of the sealing layer is reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a sealing device and a method for a high-pressure triaxial resistivity test sample, which can effectively seal the sample, enable a sealing layer and an elastic casing to be tightly attached to the surface of the sample, ensure the coordinated deformation of the sealing layer and the elastic casing along with the corresponding deformation when the sample deforms under pressure, and finally reduce the occurrence of the cracking of the sealing layer.
In order to achieve the purpose, the invention adopts the technical scheme that: a sealing device for a high-pressure triaxial resistivity test sample comprises a first sealing shell, a second sealing shell, an elastic casing, a disc-shaped base plate and a screw rod,
the first sealing shell and the second sealing shell are both in a semi-cylindrical shape, the first sealing shell and the second sealing shell are oppositely arranged and spliced into a cylinder, and a sealing element is arranged at the joint of the first sealing shell and the second sealing shell and used for sealing the joint; the surface of the cylinder is provided with a plurality of conical holes, and the position distribution of each conical hole corresponds to the electrode arrangement on the side surface of the internal sample one by one; the upper end of the cylinder is provided with an upper end cover which is connected with the cylinder in a sealing way; the upper end cover is provided with an exhaust hole, and the center of the lower part of the upper end cover is provided with a hemispherical bulge; the lower end of the cylinder is provided with a lower end cover which is hermetically connected with the cylinder, one end of the screw rod penetrates through the lower end cover, and the screw rod is in threaded connection with the lower end cover; the lower end cover is provided with a liquid injection hole, the disc-shaped base plate is placed in the cylinder, and the circumferential surface of the disc-shaped base plate is in sliding seal with the inner wall of the cylinder; the lower part of the disc-shaped base plate is contacted with one end of the screw rod;
A circular groove is formed in the center of the upper portion of the disc-shaped base plate, the diameter of the circular groove is the same as that of the lower pressing head, and the circular groove is used for enabling the part of the lower pressing head to be embedded into the circular groove; the disc-shaped base plate is provided with a liquid injection channel, the elastic sleeve is in a hollow cylindrical shape, the elastic sleeve is sleeved on the outer surface of the sample, the inner diameter of the elastic sleeve is the same as the diameter of the sample, the inner side wall of the elastic sleeve is provided with a plurality of semicircular annular bulges, and the semicircular annular bulges are uniformly distributed along the axial direction of the elastic sleeve; a plurality of rectangular holes are formed in the side wall of the elastic casing, and the position distribution of each rectangular hole corresponds to the electrode arrangement on the side face of the internal sample one to one.
Furthermore, the two ends of each conical hole are respectively a large port and a small port, and the small port of each conical hole faces the axis of the cylinder.
Furthermore, the device also comprises a conical plug, wherein a through hole is formed in the center of the conical plug, and a narrow slit is formed in one side of the conical plug.
Furthermore, the conical plug and the elastic casing are made of rubber; the rubber has the advantage of good deformation, and the first sealing shell and the second sealing shell are made of organic glass; the material has the characteristics of high strength, easiness in processing and the like, and is favorable for observing the injection condition of the sealing liquid due to the fact that the material is transparent.
Further, the seal is a flexible membrane.
Furthermore, the depth of the circular groove is 20mm, and an annular sealing ring groove with the depth of 5mm and the width of 5mm is formed in the position, 20mm away from the upper end face, of the circumferential surface of the disc-shaped base plate and used for mounting an annular sealing ring; the inner diameter of the cylinder is 28mm larger than the diameter of the sample; the liquid injection channel is 7.5mm away from the edge of the disc-shaped base plate.
A sealing method of a high-pressure triaxial resistivity test sample sealing device comprises the following specific steps:
the method comprises the following steps: improved upper pressure head and lower pressure head
The diameters of the selected upper pressure head and the lower pressure head are the same as the diameter of the sample, and 2 grooves are uniformly engraved on the side surface of the upper pressure head; 2 grooves with the same size as the upper pressure head are distributed in the range of the side surface of the lower pressure head and the top surface at a certain distance; the center of the top surface of the upper pressure head is provided with a hemispherical recess, and the shape of the hemispherical recess is matched with the hemispherical protrusion at the lower part of the upper end cover; seepage pipelines are arranged in the upper pressure head and the lower pressure head, one end of the seepage pipeline of the upper pressure head is a seepage water inlet, and one end of the seepage pipeline of the lower pressure head is a seepage water outlet; the contact surfaces of the upper pressure head and the lower pressure head with the sample are respectively provided with annular grooves which are communicated with each other, so that seepage water can uniformly permeate the rock sample;
Step two: sample assembly
Selecting rock, processing the rock into a cylindrical sample, placing the sample on a lower pressure head, and adding an upper pressure head on the upper part of the sample to ensure that the upper pressure head and the lower pressure head are respectively contacted and attached with the upper end and the lower end of the sample, and the upper pressure head, the lower pressure head and the sample are coaxial; uniformly coating a sealant on the inner side wall of an elastic casing or the surface of the elastic casing, which is contacted with an upper pressure head, a lower pressure head and a rock sample after the elastic casing is installed, standing for a period of time, sequentially sleeving the lower pressure head, the rock sample and the upper pressure head on the elastic casing when the sealant is solidified and keeps stronger viscosity, and ensuring that a seepage water inlet and a seepage water outlet are not in the elastic casing, wherein the elastic casing tightly wraps the sample, the upper pressure head and the lower pressure head, so that liquid silica gel can be prevented from flowing into the space between the sample and the contact surfaces of the upper pressure head and the lower pressure head respectively during subsequent liquid injection sealing, an annular groove and a seepage channel are blocked, and the subsequent sealing layer is tightly attached to the sealing layer, thereby realizing the coordinated deformation with the sample and reducing the possibility of the sealing layer cracking caused by the deformation of the sample; then, blocking the seepage water inlet and the seepage water outlet by using bolts to prevent liquid silica gel from entering a seepage pipeline; welding the lead wires on the back of the electrodes, respectively passing each electrode through each rectangular hole on the elastic casing, adhering the front surface of each electrode to the surface of the sample by using conductive adhesive, respectively penetrating each lead wire out of each conical hole on the first sealing shell and the second sealing shell after the conductive adhesive is solidified, sleeving a conical plug on the penetrated lead wire, and enabling the small end of the conical plug to face one side of the sealing shell; then the top surface of the upper pressure head is attached to the lower part of the upper end cover, the screw rod is slowly rotated at the moment, the lower pressure head is partially embedded into the circular groove of the disc-shaped base plate, finally the upper pressure head, the sample and the lower pressure head are attached and pressed tightly, vaseline is uniformly coated on the inner surfaces of the first sealing shell and the second sealing shell respectively, then the first sealing shell and the second sealing shell are spliced to form a cylinder through a sealing piece, then a hoop is used for hooping, the upper end cover and the lower end cover are respectively connected with the upper end and the lower end of the cylinder in a sealing mode, finally the lead is tensioned, and each conical plug is respectively plugged into each conical hole to seal the conical plug;
Step three: liquid injection seal
Adopting two rubber tubes, wherein one end of one rubber tube is connected with the exhaust hole, one end of the other rubber tube passes through the liquid injection hole and is connected with the liquid injection channel, selecting liquid silica gel with the hardness of 30 degrees after hardening as sealing liquid of a sample, putting the other end of the rubber tube connected with the liquid injection channel into the sealing liquid, and connecting the other end of the rubber tube connected with the exhaust hole with a vacuum pump; firstly, clamping a rubber tube connected with liquid silica gel by using a dovetail clamp, opening a vacuum pumping pump, pumping air into the cylinder, taking down the dovetail clamp after the dovetail clamp is in a vacuum state, slowly allowing sealing liquid to enter the cylinder under the action of atmospheric pressure, closing the vacuum pumping pump when the sealing liquid reaches a hemispherical depression of an upper pressure head, clamping the rubber tube connected with the liquid silica gel by using the dovetail clamp, detaching the rubber tube in an exhaust hole, sealing the exhaust hole by using a rubber plug, and enabling the inside of a sealing cavity to be in a negative pressure state to avoid bubbles in the sealing liquid; finally, placing the cylinder in a room temperature environment for standing for 24 hours, and gradually hardening the sealing liquid to form a sealing layer;
step four: sample stripping process
Removing the clamp, pulling out the conical plugs from the conical holes, knocking the outer part of the cylinder by a small hammer to separate the cylinder from the sealing layer, and finally slowly pulling out the lead from the conical holes on the cylinder and checking the sealing quality of the sample; finally, the seal layers except the groove on the peripheries of the upper pressure head and the lower pressure head are removed by an art designer knife, and the seal layer is reserved in the groove to effectively improve the seal effect; and the seepage water inlet and the seepage water outlet are not wrapped by the sealing layer, the bolts used for plugging the seepage water inlet and the seepage water outlet are taken out, the sealing engineering of the sample is finally completed, and the high-pressure triaxial resistivity test and the seepage test can be subsequently carried out on the sample.
Compared with the prior art, the invention adopts the mode of combining the first sealing shell, the second sealing shell, the elastic casing, the disc-shaped base plate and the screw rod, the upper pressure head, the sample and the lower pressure head are coaxially arranged to form a combined body, and then the elastic casing is sleeved on the outer surface of the sample and is fixed with the sample through the sealant; then the combined body is placed between a first sealing shell and a second sealing shell, an upper pressure head, a sample and a lower pressure head are pressed and fixed through a disc-shaped base plate and an upper end cover, finally the first sealing shell and the first sealing shell are spliced into a cylinder, and the upper end cover and a lower end cover are sealed and fixed at the upper end and the lower end of the cylinder, so that a sealed space is formed inside the cylinder; vacuumizing from the exhaust hole, filling the interior of the cylinder with sealing liquid through the liquid injection hole under the action of atmosphere, and forming a wrapped sealing layer outside the rock sample after the sealing liquid is hardened; the sealing layer formed by the invention is formed in one step, is matched with the elastic sleeve, has better sealing effect with the lead, has certain deformation buffering capacity because the elastic sleeve is made of rubber, is positioned between the sealing layer and the sample, can deform along with the corresponding deformation when the sample is deformed under pressure, ensures that the sealing layer and the sample deform coordinately, and cannot influence the sealing layer, thereby avoiding leakage of confining pressure liquid caused by inconsistent deformation; in addition, the sealing layer prepared by the method is uniform in thickness and not easy to break; and the sealing layer and the elastic casing can be tightly attached to the sample, so that the liquid in the sample is prevented from being gathered between the electrodes, and the measurement result precision of the subsequent sample subjected to high-pressure triaxial resistivity test and seepage test is finally ensured to be higher.
Drawings
FIG. 1 is a schematic view of the overall structure of the sealing device of the present invention;
FIG. 2 is a schematic structural view of a first sealing shell of the present invention;
FIG. 3 is a schematic structural view of a second sealing shell according to the present invention;
FIG. 4 is a perspective view of the elastic sleeve of the present invention;
FIG. 5 is a schematic cross-sectional view of an upper ram of the present invention;
FIG. 6 is a schematic structural view of the bottom surface of the upper ram of the present invention;
FIG. 7 is a schematic cross-sectional view of the lower ram of the present invention;
FIG. 8 is a schematic view of the top surface of the lower ram of the present invention;
FIG. 9 is a schematic structural view of the end face of a tapered plug according to the present invention;
fig. 10 is a schematic cross-sectional view of a conical plug of the present invention.
In the figure: 1-sealing the shell I; 2-sealing a second shell; 3-disc-shaped backing plate; 4-screw rod; 5-upper end cover; 6-liquid injection hole; 7-air vent; 8-lower end cap; 9-a tapered hole; 10-a conical plug; 11-an upper pressure head; 12-lower pressure head; 13-a wire; 14-an electrode; 15-sample; 16-a rubber tube; 17-an elastic casing; 18-ring seal ring; 19-a seepage water outlet; 20-seepage water inlet.
Detailed Description
The present invention will be further explained below.
As shown in figure 1, the sealing device for the high-pressure triaxial resistivity test sample comprises a first sealing shell 1, a second sealing shell 2, an elastic casing 17, a disc-shaped base plate 3 and a screw rod 4,
As shown in fig. 2 and 3, the first sealing shell 1 and the second sealing shell 2 are both semi-cylindrical, the first sealing shell 1 and the second sealing shell 2 are oppositely arranged and spliced into a cylinder, and a sealing element is arranged at the joint of the first sealing shell 1 and the second sealing shell 2 and used for sealing the joint; the surface of the cylinder is provided with a plurality of conical holes 9, and the position distribution of each conical hole 9 corresponds to the arrangement of the electrodes 14 on the side surface of the internal sample 15 one by one; two ends of each conical hole 9 are respectively a large port and a small port, and the small port of each conical hole 9 faces the axis of the cylinder; the upper end of the cylinder is provided with an upper end cover 5 which is connected with the cylinder in a sealing way; the upper end cover 5 is provided with an exhaust hole 7, and the center of the lower part of the upper end cover 5 is provided with a hemispherical bulge; the lower end of the cylinder is provided with a lower end cover 8 which is hermetically connected with the lower end cover 8, one end of the screw rod 4 penetrates through the lower end cover 8, and the screw rod 4 is in threaded connection with the lower end cover 8; the lower end cover 8 is provided with a liquid injection hole 6, the disc-shaped base plate 3 is placed in the cylinder, and the circumferential surface of the disc-shaped base plate 3 is in sliding seal with the inner wall of the cylinder; the lower part of the disc-shaped base plate 3 is contacted with one end of a screw rod 4;
a circular groove is formed in the center of the upper portion of the disc-shaped base plate 3, the diameter of the circular groove is the same as that of the lower pressing head 12, and the circular groove is used for enabling the lower pressing head 12 to be partially embedded into the circular groove; a liquid injection channel is formed in the disc-shaped base plate 3, as shown in fig. 4, the elastic sleeve 17 is hollow and cylindrical, the elastic sleeve 17 is sleeved on the outer surface of the sample 15, the inner diameter of the elastic sleeve 17 is the same as the diameter of the sample 15, a plurality of semicircular protrusions are arranged on the inner side wall of the elastic sleeve 17, and the semicircular protrusions are uniformly distributed along the axial direction of the elastic sleeve 17; the side wall of the elastic casing 17 is provided with a plurality of rectangular holes, and the positions of the rectangular holes are distributed in one-to-one correspondence with the arrangement of the electrodes 14 on the side surface of the internal sample 15; as shown in fig. 9 and 10, the plug further comprises a conical plug 10, a through hole is formed in the center of the conical plug 10, a narrow slit is formed in one side of the conical plug 10, the through hole is used for a lead 13 to pass through, and the narrow slit can adjust the circumferential diameter of the conical plug 10, so that the conical hole 9 can be conveniently plugged; each conical plug 10 corresponds to each conical hole 9 one by one; the conical plug 10 and the elastic casing 17 are made of rubber; the first sealing shell 1 and the second sealing shell 2 are made of organic glass; the sealing element is a flexible film; the depth of the circular groove is 20mm, and an annular sealing ring groove with the depth of 5mm and the width of 5mm is formed in the position, 20mm away from the upper end face, of the circumferential surface of the disc-shaped base plate 3 and used for mounting an annular sealing ring 18; the inner diameter of the cylinder is 28mm larger than the diameter of the sample 15; the liquid injection channel is 7.5mm away from the edge of the disc-shaped backing plate 3.
The sealing method of the sealing device comprises the following specific steps:
the method comprises the following steps: the upper pressure head 11 and the lower pressure head 12 are transformed
As shown in fig. 5 to 8, the upper indenter 11 and the lower indenter 12 are made of Peek (polyetheretherketone), the diameters of the selected upper indenter 11 and lower indenter 12 are the same as the diameter of the sample 15, the upper indenter 11 has a height of 60mm, and 2 grooves with a width of 6mm and a depth of 5mm are uniformly engraved on the side surface of the upper indenter 11; the height of the lower pressure head is 80mm, and 2 grooves with the same size as the upper pressure head are distributed in the range that the side surface of the lower pressure head is 50mm away from the top surface; a hemispherical recess is formed in the center of the top surface of the upper pressure head 11, and the shape of the hemispherical recess is matched with the hemispherical protrusion on the lower part of the upper end cover 5; seepage pipelines are arranged in the upper pressure head 11 and the lower pressure head 12, one end of the seepage pipeline of the upper pressure head 11 is a seepage water inlet 20, and one end of the seepage pipeline of the lower pressure head 12 is a seepage water outlet 19; the contact surfaces of the upper pressure head 11 and the lower pressure head 12 with the sample 15 are respectively provided with mutually communicated annular grooves, so that seepage water can uniformly permeate the rock sample 15;
step two: sample assembly
Selecting rock, processing the rock into a cylindrical sample 15, placing the sample 15 on a lower pressure head 12, and adding an upper pressure head 11 on the upper part of the sample 15 to ensure that the upper pressure head 11 and the lower pressure head 12 are respectively contacted and attached with the upper end and the lower end of the sample 5, and the three are coaxial; uniformly coating sealant on the inner side wall of the elastic casing 17 or the surface of the elastic casing 17 which is installed and then contacted with the upper pressure head 11, the lower pressure head 12 and the rock sample 5, standing for a period of time, sequentially sleeving the elastic casing 17 on the lower pressure head 12, the sample 15 and the upper pressure head 11 when the sealant is solidified and has strong viscosity, ensuring that the seepage water inlet 20 and the seepage water outlet 19 are not in the elastic casing 17, and then plugging the seepage water inlet 20 and the seepage water outlet 19 by using bolts to prevent liquid silica gel from entering a seepage pipeline; welding the lead 13 on the back of the electrode 14, passing each electrode 14 through each rectangular hole on the elastic casing 17, respectively, adhering the front of the electrode 14 on the surface of the sample 5 by using conductive adhesive, after the conductive adhesive is solidified, passing each lead 14 out of each conical hole on the first sealing shell 1 and the second sealing shell 2, respectively, sleeving the conical plug 10 on the passed lead, and enabling the small end of the conical plug 10 to face one side of the sealing shell; then, the top surface of an upper pressure head 11 is attached to the lower part of an upper end cover 5, at the moment, a screw rod 4 is slowly rotated, a lower pressure head 12 is partially embedded into a circular groove of a disc-shaped base plate 3, finally, the upper pressure head 11, a sample 15 and the lower pressure head 12 are attached and pressed tightly, vaseline is uniformly coated on the inner surfaces of a first sealing shell 1 and a second sealing shell 2 respectively, then the first sealing shell 1 and the second sealing shell 2 are spliced into a cylinder through sealing parts, then a hoop is used for hooping tightly, the upper end cover 5 and a lower end cover 8 are respectively connected with the upper end and the lower end of the cylinder in a sealing mode, finally a lead 13 is tensioned, and each conical plug 10 is respectively plugged into each conical hole 9 to seal the conical holes;
Step three: liquid injection seal
Adopting two rubber tubes 16, wherein one end of one rubber tube 16 is connected with the exhaust hole 7, one end of the other rubber tube 16 passes through the liquid injection hole 6 to be connected with the liquid injection channel, selecting liquid silica gel with the hardness of 30 degrees after hardening as sealing liquid of the sample 5, putting the other end of the rubber tube 16 connected with the liquid injection channel into the sealing liquid, and connecting the other end of the rubber tube 16 connected with the exhaust hole 7 with a vacuum pump; firstly, clamping the rubber tube 16 connected with the liquid silica gel by using a dovetail clamp, opening a vacuum pumping pump, pumping air into the cylinder, taking down the dovetail clamp after the rubber tube is in a vacuum state, slowly introducing sealing liquid into the cylinder under the action of atmospheric pressure, closing the vacuum pumping pump when the sealing liquid reaches the hemispherical depression of the upper pressure head 11, clamping the rubber tube 16 connected with the liquid silica gel by using the dovetail clamp, disassembling the rubber tube 16 of the exhaust hole 7, and sealing the exhaust hole 7 by using a rubber plug to ensure that the inner part of the sealing cavity is in a negative pressure state so as to avoid bubbles in the sealing liquid; finally, placing the cylinder in a room temperature environment for standing for 24 hours, and gradually hardening the sealing liquid to form a sealing layer;
step four: sample stripping process
Removing the clamps, pulling the conical plugs 10 out of the conical holes 9, knocking the outer part of the cylinder by a small hammer to separate the cylinder from the sealing layer, and finally slowly pulling the lead 13 out of the conical holes 9 on the cylinder and checking the sealing quality of the sample 5; and finally, removing the sealing layers except the grooves around the upper pressure head 11 and the lower pressure head 12 by using an art designer, so that the seepage water inlet 20 and the seepage water outlet 19 are not wrapped by the sealing layers, taking out the bolts for plugging the seepage water inlet 20 and the seepage water outlet 19, finally completing the sealing engineering of the sample 5, and subsequently carrying out a high-pressure triaxial resistivity test and a seepage test on the sample 5.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. The sealing method of the sealing device for the high-pressure triaxial resistivity test sample is characterized in that the adopted sealing device for the high-pressure triaxial resistivity test sample comprises a first sealing shell, a second sealing shell, an elastic casing, a disc-shaped base plate and a screw rod, wherein the first sealing shell and the second sealing shell are both in a semi-cylindrical shape, the first sealing shell and the second sealing shell are oppositely arranged and spliced into a cylinder, and a sealing element is arranged at the joint of the first sealing shell and the second sealing shell and used for sealing the joint; the surface of the cylinder is provided with a plurality of conical holes, and the position distribution of each conical hole corresponds to the electrode arrangement on the side surface of the internal sample one by one; the upper end of the cylinder is provided with an upper end cover which is connected with the cylinder in a sealing way; the upper end cover is provided with an exhaust hole, and the center of the lower part of the upper end cover is provided with a hemispherical bulge; the lower end of the cylinder is provided with a lower end cover which is hermetically connected with the cylinder, one end of the screw rod penetrates through the lower end cover, and the screw rod is in threaded connection with the lower end cover; the lower end cover is provided with a liquid injection hole, the disc-shaped base plate is placed in the cylinder, and the circumferential surface of the disc-shaped base plate is in sliding seal with the inner wall of the cylinder; the lower part of the disc-shaped base plate is contacted with one end of the screw rod; a circular groove is formed in the center of the upper portion of the disc-shaped base plate, the diameter of the circular groove is the same as that of the lower pressing head, and the circular groove is used for enabling the part of the lower pressing head to be embedded into the circular groove; the disc-shaped base plate is provided with a liquid injection channel, the elastic sleeve is in a hollow cylindrical shape, the elastic sleeve is sleeved on the outer surface of the sample, the inner diameter of the elastic sleeve is the same as the diameter of the sample, the inner side wall of the elastic sleeve is provided with a plurality of semicircular annular bulges, and the semicircular annular bulges are uniformly distributed along the axial direction of the elastic sleeve; a plurality of rectangular holes are seted up to the lateral wall of elasticity cover shell, and the position distribution of each rectangular hole arranges the one-to-one with the electrode of inside sample side, and concrete step is:
The method comprises the following steps: improved upper pressure head and lower pressure head
The diameters of the selected upper pressure head and the lower pressure head are the same as the diameter of the sample, and 2 grooves are uniformly engraved on the side surface of the upper pressure head; 2 grooves with the same size as the upper pressure head are distributed in the range of the side surface of the lower pressure head and a certain distance from the top surface; the center of the top surface of the upper pressure head is provided with a hemispherical recess, and the shape of the hemispherical recess is matched with the hemispherical protrusion at the lower part of the upper end cover; seepage pipelines are arranged in the upper pressure head and the lower pressure head, one end of the seepage pipeline of the upper pressure head is a seepage water inlet, and one end of the seepage pipeline of the lower pressure head is a seepage water outlet; the contact surfaces of the upper pressure head and the lower pressure head with the sample are respectively provided with annular grooves which are communicated with each other, so that seepage water can uniformly permeate the rock sample;
step two: sample assembly
Selecting rock, processing the rock into a cylindrical sample, placing the sample on a lower pressure head, and adding an upper pressure head on the upper part of the sample to ensure that the upper pressure head and the lower pressure head are respectively contacted and attached with the upper end and the lower end of the sample, and the upper pressure head, the lower pressure head and the sample are coaxial; uniformly coating a sealant on the inner side wall of the elastic casing or the surface of the elastic casing, which is contacted with the upper pressure head, the lower pressure head and the rock sample after the elastic casing is installed, standing for a period of time, sequentially sleeving the lower pressure head, the rock sample and the upper pressure head on the elastic casing when the sealant is solidified and has strong viscosity, ensuring that a seepage water inlet and a seepage water outlet are not in the elastic casing, and then plugging the seepage water inlet and the seepage water outlet by using bolts to prevent liquid silica gel from entering a seepage pipeline; welding the lead wires on the back of the electrodes, respectively passing each electrode through each rectangular hole on the elastic casing, adhering the front surface of each electrode to the surface of the sample by using conductive adhesive, respectively penetrating each lead wire out of each conical hole on the first sealing shell and the second sealing shell after the conductive adhesive is solidified, sleeving a conical plug on the penetrated lead wire, and enabling the small end of the conical plug to face one side of the sealing shell; then the top surface of the upper pressure head is attached to the lower part of the upper end cover, the screw rod is slowly rotated at the moment, the lower pressure head is partially embedded into the circular groove of the disc-shaped base plate, finally the upper pressure head, the sample and the lower pressure head are attached and pressed tightly, vaseline is uniformly coated on the inner surfaces of the first sealing shell and the second sealing shell respectively, then the first sealing shell and the second sealing shell are spliced to form a cylinder through a sealing piece, then a hoop is used for hooping, the upper end cover and the lower end cover are respectively connected with the upper end and the lower end of the cylinder in a sealing mode, finally the lead is tensioned, and each conical plug is respectively plugged into each conical hole to seal the conical plug;
Step three: liquid injection seal
Adopting two rubber tubes, wherein one end of one rubber tube is connected with the exhaust hole, one end of the other rubber tube passes through the liquid injection hole and is connected with the liquid injection channel, selecting liquid silica gel with the hardness of 30 degrees after hardening as sealing liquid of a sample, putting the other end of the rubber tube connected with the liquid injection channel into the sealing liquid, and connecting the other end of the rubber tube connected with the exhaust hole with a vacuum pump; firstly, clamping a rubber tube connected with liquid silica gel by using a dovetail clamp, opening a vacuum pumping pump, pumping air into the cylinder, taking down the dovetail clamp after the dovetail clamp is in a vacuum state, slowly allowing sealing liquid to enter the cylinder under the action of atmospheric pressure, closing the vacuum pumping pump when the sealing liquid reaches a hemispherical depression of an upper pressure head, clamping the rubber tube connected with the liquid silica gel by using the dovetail clamp, detaching the rubber tube in an exhaust hole, sealing the exhaust hole by using a rubber plug, and enabling the inside of a sealing cavity to be in a negative pressure state to avoid bubbles in the sealing liquid; finally, placing the cylinder in a room temperature environment for standing for 24 hours, and gradually hardening the sealing liquid to form a sealing layer;
step four: sample stripping process
Removing the clamp, pulling out the conical plugs from the conical holes, knocking the outer part of the cylinder by a small hammer to separate the cylinder from the sealing layer, and finally slowly pulling out the lead from the conical holes on the cylinder and checking the sealing quality of the sample; and finally, removing the sealing layers except the grooves around the upper pressure head and the lower pressure head by using an art designing cutter, so that the seepage water inlet and the seepage water outlet are not wrapped by the sealing layers, taking out bolts for plugging the seepage water inlet and the seepage water outlet, finally completing the sealing engineering of the sample, and subsequently carrying out high-pressure triaxial resistivity test and seepage test on the sample.
2. The method as claimed in claim 1, wherein the two ends of each tapered hole are respectively a large port and a small port, and the small port of each tapered hole faces the axis of the cylinder.
3. The sealing method of the sealing device for the high-pressure triaxial resistivity test sample according to claim 1, characterized by further comprising a conical plug, wherein a through hole is formed in the center of the conical plug, and a narrow slit is formed in one side of the conical plug.
4. The method as claimed in claim 3, wherein the conical plug and the elastic casing are made of rubber; the first sealing shell and the second sealing shell are made of organic glass.
5. The method of claim 1 wherein the seal is a flexible membrane.
6. The sealing method of the high-pressure triaxial resistivity test specimen sealing device according to claim 1, wherein the depth of the circular groove is 20mm, and an annular sealing ring groove with a depth of 5mm and a width of 5mm is formed at a position 20mm from the upper end surface on the circumferential surface of the disc-shaped base plate and is used for installing the annular sealing ring; the inner diameter of the cylinder is 28mm larger than the diameter of the sample; the liquid injection channel is 7.5mm away from the edge of the disc-shaped base plate.
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