CN108593457B - Coal rock high-temperature high-pressure deformation test device and test method - Google Patents
Coal rock high-temperature high-pressure deformation test device and test method Download PDFInfo
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- CN108593457B CN108593457B CN201810539243.0A CN201810539243A CN108593457B CN 108593457 B CN108593457 B CN 108593457B CN 201810539243 A CN201810539243 A CN 201810539243A CN 108593457 B CN108593457 B CN 108593457B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
Abstract
The invention discloses a coal rock high-temperature high-pressure deformation test device and a test method, wherein a coal rock sample is sleeved in a graphite pipe group, an upper axial pressure loading unit and a lower axial pressure loading unit are respectively arranged at the upper end and the lower end of the graphite pipe group to generate axial pressure on the coal rock sample, a first protective sleeve, a second protective sleeve and a water-cooling sleeve are sequentially sleeved around the graphite pipe group from inside to outside, a confining pressure oil cavity, a confining pressure piston and a confining pressure head are sequentially sleeved on the upper axial pressure unit from top to bottom, hydraulic oil is injected into the confining pressure oil cavity to push the confining pressure piston to move downwards and drive the confining pressure head at the lower end of the confining pressure piston to move downwards, the pyrophyllite sleeve is compressed by the confining pressure head to make the pyrophyllite sleeve be compressed and deformed to transmit pressure transversely to generate confining pressure on the coal rock sample, the synchronous loading of the axial pressure and the confining pressure can be realized by the test device, and the structural integrity of the coal rock sample can be ensured during sampling, can accurate simulation geology environmental aspect, rational in infrastructure, convenient to detach, factor of safety is high.
Description
Technical Field
The invention relates to the field of coal rock deformation test equipment, in particular to a coal rock high-temperature high-pressure deformation test device and a coal rock high-temperature high-pressure deformation test method.
Background
With the continuous development and utilization of shallow coal and oil gas resources, the occurrence amount of the resources gradually tends to shrink, and the deep coal and oil gas resources become favorable target areas for finding mines in the future in China. The research on the physical and chemical structural characteristics of the deep coal rock mass can powerfully support the exploration and development of deep energy. China is at the junction of Eurasia, Pacific and India plates, and the overall construction complexity is higher than that of western countries such as the United states, Australia and the like. The superposition transformation effect of the multi-stage tectonic movement enables the physical properties and the chemical properties of the coal rock mass to be obviously differentiated. The strong deformation structural coal rock is closely related to the occurrence of coal (rock) and gas outburst disasters in the coal mining process, and is a bottleneck for restricting the healthy and safe development of the coal industry in China; meanwhile, the strong deformation of the coal rock greatly increases the heterogeneity of unconventional oil and gas reservoirs, and increases the difficulty in mining and utilization. Therefore, the simulation of the deformation characteristics of the coal rock mass under different in-situ geological conditions has important practical significance on the exploration, development and utilization of coal and oil gas resources under different geological occurrence conditions.
In the prior art, a Chinese patent with publication number CN103884604 discloses a multifunctional high-temperature high-pressure triaxial coal petrography test device and a method, firstly, the structure of the device is unreasonable, the coal petrography test sample is easy to damage in the process of being taken out by a dismounting device after the test is finished, a complete sample structure cannot be obtained, and the analysis and the research of the tested sample are not facilitated; the device has a single loading mode, synchronous loading of axial pressure and confining pressure is difficult to realize, and the accuracy of geological environment simulation is low; moreover, the safety coefficient of the device is not high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a coal rock high-temperature high-pressure deformation test device which can realize synchronous loading of axial pressure and confining pressure, has a reasonable structure, can ensure the structural integrity of a coal rock sample during sampling, can accurately simulate geological environment, is convenient to disassemble and has high safety coefficient.
In order to achieve the above object, the present invention provides a coal rock high temperature and high pressure deformation test device, which is movably disposed on a track, and comprises: the flat trolley is movably arranged on the track and is provided with a first center hole which is communicated up and down; the shell is internally provided with an accommodating chamber, and the lower end part of the shell is connected with the flat trolley; the confining pressure end cover is fixed at the upper end part of the accommodating cavity and is provided with a second central hole and an oil inlet hole which are communicated up and down; the confining pressure piston comprises a rod part matched with the second central hole and a piston part integrally formed at the lower end of the rod part, and a third central hole which is communicated up and down is formed in the confining pressure piston; the confining pressure head is fixed at the lower end of the piston part, a fourth central hole which is communicated up and down is formed in the confining pressure head, and the fourth central hole, the third central hole, the second central hole and the first central hole are coaxially arranged; a graphite tube assembly, the graphite tube assembly comprising: the sample sleeve is coaxially arranged at the upper end of the first center hole and is fixedly connected with the flat trolley; the first graphite pipe is arranged along the inner wall of the sample sleeve, the second graphite pipe is sleeved in the first graphite pipe, a cavity is formed between the second graphite pipe and the first graphite pipe, and the confining pressure head is suitable for being matched with the cavity; the pyrophyllite sleeve is filled in the cavity; a lower axle load unit, the lower axle load unit comprising: the coal rock sample is arranged at the upper end of the lower pressure rod, is coaxially arranged with the lower pressure rod, is positioned at the lower end of the second graphite tube and is also provided with a confining pressure cushion block, and an insulating ring is arranged between the confining pressure cushion block and the sample sleeve; a mica sheet is further arranged between the pyrophyllite sleeve and the confining pressure cushion block, and an insulating sleeve is further arranged between the first central hole and the lower pressing rod; the water-cooling sleeve, the first protective sleeve and the second protective sleeve are sequentially sleeved between the shell and the sample sleeve from outside to inside, the inner diameter of the upper end of the inner wall of the first protective sleeve is larger than that of the lower end of the inner wall of the first protective sleeve, and the outer wall of the second protective sleeve is matched with the first protective sleeve; a water trough is arranged on the outer wall of the water-cooling sleeve; an upper axial pressure loading unit, the upper axial pressure loading unit comprising: the upper pressure head is matched with the third central hole; the upper pressure rod is matched with the fourth central hole, one end of the upper pressure rod is connected to the lower end of the upper pressure head, and the other end of the upper pressure rod is matched with the second graphite pipe and abuts against the coal rock sample; the collecting pipe group comprises a first collecting pipe and a second collecting pipe, the first collecting pipe sequentially penetrates through the upper pressure head and the upper pressure rod, one end of the first collecting pipe is connected to the upper end of the coal rock sample, and the other end of the first collecting pipe is a first collecting opening located on the upper pressure head; the second collecting pipe sequentially penetrates through the base and the lower pressing rod, one end of the second collecting pipe is connected to the lower end of the coal rock sample, and the other end of the second collecting pipe is a second collecting opening located on the base; the electrode plate group comprises an upper electrode plate connected with the upper pressure head and a lower electrode plate connected with the supporting seat, and the anode of the power supply is sequentially communicated with the upper pressure head, the upper pressure rod and the confining pressure head to the upper end of the graphite pipe assembly through the upper electrode plate; and the negative electrode of the power supply is sequentially communicated with the base, the lower pressing rod and the confining pressure cushion block to the lower end of the graphite pipe assembly through the lower electrode plate so as to heat the coal rock sample.
In the technical scheme, before a test, a graphite tube assembly is installed on a flat trolley, a coal rock sample is placed in a second graphite tube, the lower end of the second graphite tube is abutted against a lower pressure rod, and a water cooling sleeve, a first protective sleeve and a second protective sleeve are sleeved between a shell and a sample sleeve in sequence from outside to inside; sleeving a confining pressure piston into the second central hole, wherein the upper end of the confining pressure head is connected to the lower end of the confining pressure piston; then, enabling the combined confining pressure end cover, confining pressure piston and confining pressure head to enter the accommodating cavity from the upper opening of the accommodating cavity of the shell, and enabling the lower end of the confining pressure head to abut against the pyrophyllite sleeve; finally, enabling the upper pressure head and the upper pressure rod which are connected to sequentially penetrate through the third central hole and the fourth central hole to be abutted against the upper end of the coal rock sample; during the test, the axial pressure on the coal rock sample can be realized by upwards jacking the hydraulic lifting platform at the lower end of the base and downwards pressing the upper pressure head by the press machine at the upper end of the upper pressure head; hydraulic oil can be injected from the oil inlet, the hydraulic oil pushes the confining pressure piston to move downwards along the second central hole, the confining pressure head positioned at the lower end of the confining pressure piston is driven to move downwards, the pyrophyllite sleeve is compressed by the confining pressure head, the pyrophyllite sleeve is compressed and deformed to transmit pressure transversely, and confining pressure is generated on the coal rock sample; heating the coal rock sample through an electrode plate group to realize a high-temperature environment; after the test is completed, the shell and the flat car are disassembled, the device on the upper portion of the flat car is integrally lifted, namely the shell, the confining pressure end cover, the confining pressure piston, the confining pressure head, the water-cooling sleeve, the first protective sleeve, the second protective sleeve, the upper pressure head and the upper pressure rod are lifted together, then the first graphite pipe, the pyrophyllite sleeve, the second graphite pipe, the coal rock sample and the corundum pad inside the sample sleeve are taken out through the mold, and the coal rock sample is taken out through the cutting tool. The test device can realize the synchronous loading of axial pressure and confining pressure, the structure of a coal rock sample cannot be damaged during sampling, the geological environment can be accurately simulated, and the safety factor is high.
In addition, the coal rock high-temperature high-pressure deformation test device and the method provided by the invention can also have the following technical characteristics:
furthermore, the testing device further comprises a guide rod, the flat car is connected with the shell through the guide rod, at least two first positioning holes which are symmetrically arranged are arranged on the flat car, a second positioning hole corresponding to the first positioning hole is arranged on the shell, and the guide rod sequentially penetrates through the second positioning hole and the first positioning hole.
Further, the flatbed cart includes: the first central hole is formed in the shaft diameter; the flange, the flange by the periphery wall of axle footpath outwards extends, and is a plurality of first locating hole is located on the flange.
Further, be equipped with interior board that extends on the casing, interior board that extends along the inner wall of casing deviates from the casing extends in order to form the fifth centre bore to the central direction of casing, the fifth centre bore with the shaft diameter cooperatees, just the water-cooling sleeve pipe first protective sheath all supports on interior board that extends.
Preferably, the base and the flat car are adjustably connected through an adjusting bolt.
Furthermore, a hanging lug is fixed at the upper end of the confining pressure end cover.
Preferably, the water passing groove is spiral and is wound from the upper end of the water-cooling sleeve to the lower end of the water-cooling sleeve.
Preferably, the piston part, still be equipped with the sealing washer on the periphery wall of water-cooling sleeve pipe.
The invention also aims to provide a coal rock high-temperature high-pressure deformation test method, which can obtain a complete coal rock sample, is convenient to operate and is safer and more reliable.
In order to achieve the purpose, the invention provides a coal rock high-temperature high-pressure deformation test method, which comprises the following steps:
s1: sample loading: firstly, spraying a high-temperature and high-pressure resistant lubricant on the inner wall of the first graphite pipe and the outer wall of the second graphite pipe, sleeving a mold in a cavity formed between the first graphite pipe and the second graphite pipe, filling a paraffin wax sleeve in the mold, and pressing the pyrophyllite powder into a plurality of pyrophyllite sleeves in a segmented manner in order to simulate geological conditions more truly; the upper end surface of the lower pressure rod is provided with a corundum pad, and the coal rock sample is placed on the corundum pad.
S2: installation: a water-cooling sleeve, a first protective sleeve and a second protective sleeve are sleeved between the shell and the sample sleeve from outside to inside in sequence; sleeving a confining pressure piston into a second center hole, connecting the upper end of a confining pressure head to the lower end of the confining pressure piston, and coaxially arranging the second center hole, a third center hole and a fourth center hole; then, the combined confining pressure end cover, confining pressure piston and confining pressure head enter the accommodating cavity from the upper opening of the accommodating cavity of the shell, so that the lower end of the confining pressure head is abutted against the pyrophyllite sleeve, and the confining pressure end cover is connected with the shell through a fixing piece; and then the upper pressure rod and the upper pressure head are sequentially arranged in the third central hole and the fourth central hole.
S3: pressurizing and heating: the upper end of the upper pressure head and the lower end of the base are respectively provided with a pressure machine, when axial pressurization is carried out, the upper pressure head moves downwards in the third central hole, and at the moment, the upper pressure head presses the upper pressure rod downwards to move downwards in the fourth central hole, so that the upper pressure rod downwards compresses the coal rock sample; simultaneously, the base moves upwards to drive the lower pressing rod in the first central hole to move upwards so as to compress the lower end surface of the coal rock sample; when confining pressure is carried out, hydraulic oil is injected from the oil inlet, the hydraulic oil pushes the confining pressure piston to move downwards along the second central hole, a confining pressure head positioned at the lower end of the confining pressure piston is driven to move downwards, and the pyrophyllite sleeve is compressed by the confining pressure head to be deformed and transmit pressure to the transverse direction, so that confining pressure is generated on the coal rock sample; and starting the electrode plate group to heat the coal rock sample.
S4: sampling: the shell and the flat car are disassembled, the device on the upper portion of the flat car is integrally lifted, namely the shell, the confining pressure end cover, the confining pressure piston, the confining pressure head, the water-cooling sleeve, the first protective sleeve, the second protective sleeve, the upper pressure head and the upper pressure rod are lifted together, then the first graphite pipe, the pyrophyllite sleeve, the second graphite pipe, the coal rock sample and the corundum pad inside the sample sleeve are taken out through the mold, and the coal rock sample is taken out through the cutting tool.
Drawings
FIG. 1 is a schematic structural diagram of a coal rock high-temperature high-pressure deformation test device;
FIG. 2 is an enlarged view of a portion of FIG. 1 at I;
FIG. 3 is an enlarged view of a portion of FIG. 1 at Q;
FIG. 4 is a schematic diagram of a mold for sampling coal and rock.
In the figure, 100 is a test device; 1A, a flat car; 1A1, shaft diameter; 1A2. a flange; 1a11. a first center hole; 1AA, a roller; 2A, a shell; 2A1. an inner extension plate; 2aa. fifth central aperture; 3A, enclosing a pressure end cover; 3A1. a second central aperture; 3A2. an oil inlet hole; 4A, a confining pressure piston; 4A1. a rod part; 4a2. a piston portion; 4aa. a third central aperture; 5A, a confining pressure head; 5A1. a fourth central hole; 6A, a graphite pipe assembly; 6A1. sample sleeve; 6A2. a first graphite tube; 6A3. a second graphite tube; 6A4. pyrophyllite sleeve; 6AA. a cavity; 7A, a lower axial pressure loading unit; 7A1. a base; 7A11. adjusting bolt; 7A2. a lower pressure rod; 7A3. confining pressure cushion blocks; 8a. coal rock sample; 9A corundum pad; 10A, an insulating ring; mica sheets 11 a; 12A, a water-cooling sleeve; 12A1. a water trough; 13a, a first protective sheath; 14a. a second protective sheath; 15A, an upper axial pressure loading unit; 15A1. an upper pressure head; 15A2. an upper pressure rod; electrode plate group 16A; 16a1. an upper electrode plate; 16A2. a lower electrode plate; 17a, a guide bar; 18A. hangers; 19A, a sealing ring; 20A, an insulating sleeve; a thermocouple; AA, collecting a tube group; aa1. a first collection tube; aa11. a first collection port; aa2. a second collection tube; aa21. a second collection port; aac, central axis; 300. a mold; 1C, a first mold; 1c1. a chamber; 2C, a second mold; 2C1. a spring; 2C2. base; 2C3. through holes.
Detailed Description
The invention will be further explained with reference to the drawings.
The coal rock high-temperature high-pressure deformation test device according to the invention, as shown in fig. 1-3, comprises: the device comprises a flat trolley 1A, a shell 2A, a confining pressure end cover 3A, a confining pressure piston 4A, a confining pressure head 5A, a graphite tube assembly 6A, a lower axial pressure loading unit 7A, a base 7A1, a lower pressure rod 7A2, a confining pressure cushion block 7A3, a water-cooling sleeve 12A, a first protective sleeve 13A, a second protective sleeve 14A, an upper axial pressure loading unit 15A, a collecting tube group AA and an electrode plate group 16A.
The flat car 1A is movably arranged on the track, and a first center hole 1A11 which penetrates up and down is formed in the flat car 1A, specifically, on one hand, the flat car 1A plays a role in supporting the test device 100, on the other hand, the flat car is movably arranged on the track, for example, rollers 1AA are arranged on two sides of the flat car 1A, and the rollers 1AA are suitable for being matched with the track, so that the test device 100 can be conveniently moved.
The test device comprises a shell 2A, wherein an accommodating cavity is defined inside the shell 2A, the lower end of the shell 2A is connected with the flat car 1A, specifically, the upper end of the shell 2A is of an open structure, other connecting components can be poured into the shell 2A conveniently, the lower end of the shell 2A is connected with the flat car 1A, and therefore the whole framework of the test device 100 can be formed.
A confining pressure end cover 3A, wherein the confining pressure end cover 3A is fixed at the upper end part of the accommodating cavity and is provided with a second central hole 3A1 and an oil inlet hole 3A2 which are vertically penetrated, namely, the confining pressure end cover 3A is connected with the shell 2A with an open upper end part to seal the shell, and the second central hole 3A1 is arranged at the central position of the confining pressure end cover 3A and can be connected with other connecting components; an oil inlet hole 3a2 is provided at a position offset from the second center hole 3a1 to allow hydraulic oil to be injected into the accommodation chamber from the oil inlet hole 3a2.
The confining pressure piston 4A comprises a rod part 4A1 matched with the second center hole 3A1 and a piston part 4A2 integrally formed at the lower end of the rod part 4A1, a third center hole 4AA penetrating up and down is formed in the confining pressure piston 4A, specifically, a confining pressure oil cavity is formed between the piston part 4A2 and the confining pressure end cover 3A, when the piston works, hydraulic oil can be injected from the oil inlet hole 3A2, and the confining pressure piston 4A moves downwards.
And the confining pressure ram 5A is fixed at the lower end of the piston part 4a2, and is provided with a fourth central hole 5A1 which penetrates downwards, and the fourth central hole 5A1, the third central hole 4AA, the second central hole 3a1 and the first central hole 1a11 are all coaxially arranged, that is, the fourth central hole 5A1, the third central hole 4AA, the second central hole 3a1 and the first central hole 1a11 are all coaxially arranged with the central axis AAC. Specifically, the confining pressure head 5A and the piston part 4a2 can be fastened and connected through bolts, and the connection mode is safe and reliable and is convenient to mount and dismount; and the accuracy of the installation of the experimental apparatus can be ensured by coaxially arranging the first center hole 1a11, the second center hole 3a1, the third center hole 4AA and the fourth center hole 5a1.
A graphite tube assembly 6A, the graphite tube assembly 6A comprising: a sample sleeve 6a1 and a first graphite tube 6a2, wherein the sample sleeve 6a1 is coaxially arranged at the upper end of the first central hole 1A11 and is fixedly connected with the flat car 1A, and can be fixedly connected through a fastener, such as a bolt; the first graphite tube 6a2 is disposed along the inner wall of the sample sleeve 6a1, the second graphite tube 6A3 is sleeved inside the first graphite tube 6a2 and forms a cavity 6AA with the first graphite tube 6a2, and the confining pressure head 5A is adapted to cooperate with the cavity 6 AA; and a pyrophyllite sleeve 6A4, wherein the pyrophyllite sleeve 6A4 is filled in the cavity 6AA, in other words, the graphite tube assembly 6A is connected with the flat car 1A, when the shell 2A is separated from the flat car 1A, the graphite tube assembly 6A can not leave the flat car 1A along with the lifting of the shell 2A.
A lower axial pressure loading unit 7A, the lower axial pressure loading unit 7A including: the base 7A1, the base 7A1 is connected with the flat car 1A, the lower pressure rod 7A2, the lower pressure rod 7A2 is matched with the first central hole 1A11, one end of the lower pressure rod is connected with the base 7A1, the other end of the lower pressure rod is matched with the second graphite tube 6A3, the coal rock sample 8A is arranged at the upper end of the lower pressure rod 7A2, the lower pressure rod 7A2 is coaxially arranged, a confining pressure cushion block 7A3 is arranged at the lower end of the second graphite tube 6A3, and an insulating ring 10A is arranged between the confining pressure cushion block 7A3 and the sample sleeve 6A 1; a mica sheet 11A is further arranged between the pyrophyllite powder and the confining pressure cushion block 7A3, and an insulating sleeve 20A is further arranged between the first central hole 1A11 and the lower pressure rod 7A 2; it should be noted that the confining pressure pad 7A3 is sleeved on the lower pressure rod 7a2, and its main function is to provide a bearing carrier for loading confining pressure, and the confining pressure pad is designed into such a movable structure, on one hand, the insulating ring 10A is added for convenience, so as to avoid the short circuit of the testing device 100, and on the other hand, the coal rock sample 8A can be better detached by being movable. In operation, the hydraulic lifting platform at the lower end of the base 7A1 lifts the base 7A1 upward, thereby moving the lower pressure rod 7A2 at the upper end of the base 7A1 upward and pressing against the coal rock sample 8A.
The sample sleeve 6A1 is arranged between the shell 2A and the sample sleeve 12A, and a water cooling sleeve 12A, a first protective sleeve 13A and a second protective sleeve 14A are sequentially sleeved from outside to inside, the water cooling sleeve 12A and the first protective sleeve 13A are connected with the shell 2A, the inner diameter of the upper end of the inner wall of the first protective sleeve 13A is larger than the inner diameter of the lower end of the inner wall of the first protective sleeve 13A, and the outer wall of the second protective sleeve 14A is suitable for being matched with the first protective sleeve 13A; the outer wall of the water-cooling sleeve 12A is provided with a water through groove 12A 1; specifically, a water inlet and a water outlet are arranged on the shell 2A, the water inlet is connected with an upper port of the water trough 12A1, the water outlet is connected with a lower port of the water trough 12A1, cooling water enters the water trough 12A1 from the water inlet and flows to the water outlet along the outer wall of the water cooling pipe, so that the surface temperature of the test device 100 can be reduced, the water cooling sleeve 12A can also be used for reducing the temperature of a lead in the test device 100, and the lead is prevented from being damaged due to overhigh temperature; meanwhile, the oil temperature of the hydraulic oil can be cooled to a certain extent.
An upper axial pressure loading unit 15A, the upper axial pressure loading unit 15A including: an upper ram 15a1, said upper ram 15a1 cooperating with said third central aperture 4 AA; the upper pressure rod 15A2, the upper pressure rod 15A2 is matched with the fourth center hole 5A1, one end of the upper pressure rod is connected to the lower end of the upper pressure head 15A1, and the other end of the upper pressure rod is matched with the second graphite tube 6A3 and abuts against the coal rock sample 8A; specifically, a press is provided on the upper ram 15a1, and the upper ram 15a1 is moved downward along the third center hole 4AA by the press, so that the upper pressing rod 15a2 connected thereto is pushed, and the upper pressing rod 15a2 is pressed against the upper end of the coal rock sample 8A; that is, the pressurization of the coal rock sample 8A in the axial direction can be accomplished by the upper axial pressure loading unit 15A and the lower axial pressure loading unit 7A.
A collecting pipe group AA, wherein the collecting pipe group AA comprises a first collecting pipe AA1 and a second collecting pipe AA2, and the first collecting pipe AA1 sequentially penetrates through the upper pressure head 15A1 and the upper pressure rod 15A2 and is connected to the upper end of the coal rock sample 8A; and a first collecting port AA11 communicated with the outside is arranged on the upper pressure head 15A1, the second collecting pipe AA2 sequentially penetrates through the base 7A1 and the lower pressure rod 7A2 and is connected to the lower end of the coal rock sample 8A, and a second collecting port AA21 communicated with the outside is arranged on the base 7A1. Specifically, through holes are formed in the central axes of the upper pressure head 15a1, the upper pressure rod 15a2, the base 7a1 and the lower pressure rod 7a2, so that a first collecting pipe AA1 is inserted into the upper pressure head 15a1 and the upper pressure rod 15a2, and a second collecting pipe AA2 is inserted into the base 7a1 and the lower pressure rod 7a2, so that gas generated by the coal rock sample 8A can be collected through the first collecting port AA11 and the second collecting port AA21 in the process of pressurizing the coal rock sample 8A.
The electrode plate group 16A comprises an upper electrode plate 16A1 connected with the upper pressure head and a lower electrode plate 16A2 connected with the supporting seat, and the positive electrode of the power supply is sequentially communicated with the upper pressure head 15A1, the upper pressure rod 15A2, the confining pressure head 5A and the upper end of the graphite tube assembly 6A through the upper electrode plate 16A 1; the negative electrode of the power supply is sequentially communicated with the base 7A1, the lower pressing rod 7A2, the confining pressure cushion block 7A3 and the lower end of the graphite tube assembly 6A through the lower electrode plate 16A2 so as to heat the coal rock sample 8A; that is, the upper electrode plate 16a1 is connected with the positive electrode of the power supply, and the lower electrode plate 16a2 is connected with the negative electrode of the power supply, so that the positive electrode of the power supply is sequentially communicated with the upper pressure head, the upper pressure rod and the confining pressure head to the upper end of the graphite tube group; the negative electrode of the power supply is sequentially communicated with the base, the lower pressing rod and the confining pressure cushion block to the lower end of the graphite pipe group; the graphite tube groups can be heated by the electrode plate groups 16A. It is noted that the testing device 100 further comprises a thermocouple 21A, and the thermocouple 21A is inserted into the second collection pipe AA2 and connected to the lower end of the coal rock sample 8A, that is, the thermocouple 21A is inserted along the second collection pipe AA2 to be close to the coal rock sample 8A, so that the temperature of the coal rock sample 8A can be measured. It should be noted that, the thermocouple 21A is inserted into the second collecting tube AA2 and does not block the second collecting tube AA2, so as to hinder the collection of gas, and in order to facilitate the installation of the thermocouple 21A and the collection of gas, a second collecting port AA21 may be provided on the side wall of the pedestal 7a1, the second collecting port AA21 sequentially passes through the pedestal 7a1 and the lower pressing rod 7a2 to be connected to the second collecting tube AA2 of the lower pressing rod 7a2, and the collecting port located at the lower end of the pedestal 7a1, that is, the collecting port where the second collecting tube AA2 vertically passes through the pedestal 7a1, is sealed after the thermocouple 21A is installed, so that the installation of the thermocouple 21A is facilitated and the collection of gas is also possible.
It can be understood that, before the test, the graphite tube assembly 6A is installed on the flat car 1A, the coal rock sample 8A is placed in the second graphite tube 6A3, and the lower end of the coal rock sample abuts against the lower pressure rod 7a2, and the water-cooled sleeve 12A, the first protective sleeve 13A and the second protective sleeve 14A are sequentially sleeved between the shell 2A and the sample sleeve 6A1 from outside to inside; sleeving the confining pressure piston 4A into the second central hole 3A1, and connecting the upper end of the confining pressure head 5A to the lower end of the confining pressure piston 4A; then, the combined confining pressure end cover 3A, confining pressure piston 4A and confining pressure head 5A enter the accommodating chamber from the upper opening of the accommodating chamber of the shell 2A, so that the lower end of the confining pressure head 5A is abutted against the pyrophyllite sleeve 6A 4; finally, the connected upper pressure head 15A1 and the upper pressure rod 15A2 sequentially penetrate through the third central hole 4AA and the fourth central hole 5A1 and abut against the upper end of the coal rock sample 8A; during the test, the axial pressure on the coal rock sample 8A can be realized by jacking up the hydraulic lifting platform at the lower end of the base 7A1 and pushing down the upper pressure head 15A1 by the press machine at the upper end of the upper pressure head 15A 1; hydraulic oil can be injected from the oil inlet, the hydraulic oil pushes the confining pressure piston 4A to move downwards along the second center hole 3A1, the confining pressure head 5A at the lower end of the confining pressure piston 4A is driven to move downwards, the pyrophyllite sleeve 6A4 is compressed by the confining pressure head 5A, the pyrophyllite sleeve 6A4 is compressed and deformed to transmit pressure transversely, and confining pressure is generated on the coal rock sample 8A; the coal rock sample 8A is heated through the electrode plate group 16A to realize a high-temperature environment; after the test is finished, the shell 2A and the flat car 1A are disassembled, the device on the upper portion of the flat car 1A is integrally lifted, namely the shell 2A, the confining pressure end cover 3A, the confining pressure piston 4A, the confining pressure head 5A, the water-cooling sleeve 12A, the first protective sleeve 13A, the second protective sleeve 14A, the upper pressure head 15A1 and the upper pressure rod 15A2 are lifted together, then the first graphite pipe 6A2, the pyrophyllite sleeve 6A4, the second graphite pipe 6A3, the coal rock sample 8A and the corundum pad 9A in the sample sleeve 6A1 are taken out through a mold, and the coal rock sample 8A is taken out through a cutting tool. This test device 100 can realize the synchronous loading of axle load and confined pressure, can guarantee the integrality of coal petrography sample structure during the sample, can accurate simulation geological environment nature, and is rational in infrastructure, convenient to detach, factor of safety is high.
In an embodiment of the present invention, as shown in fig. 1, the testing apparatus 100 further includes a guide rod 17A, the flat car 1A is connected to the housing 2A through the guide rod 17A, at least two first positioning holes symmetrically arranged are disposed on the flat car 1A, a second positioning hole corresponding to the first positioning hole is disposed on the housing 2A, and the guide rod 17A sequentially passes through the second positioning hole and the first positioning hole; that is to say, in the test, when the housing 2A is lowered onto the flat car 1A or the housing 2A is lifted away from the flat car 1A, the guide rod 17A guides the housing 2A, so that the mounting and dismounting precision of the housing 2A can be improved, and the test accuracy is improved.
In one embodiment of the present invention, as shown in fig. 1, the flatbed cart 1A includes: the shaft diameter 1A1, the first central hole 1A11 is arranged on the shaft diameter 1A 1; a flange 1a2, the flange 1a2 extending outward from the outer peripheral wall of the shaft diameter 1a1, the first positioning holes being provided on the flange 1a2, specifically, a plurality of first positioning holes may be provided at intervals along the circumferential direction of the shaft diameter 1a1, and a guide rod 17A may be connected by providing the first positioning holes, so that the moving range of the housing 2A is limited on the guide rod 17A; this configuration can improve the load bearing capacity of the test apparatus 100.
In an embodiment of the present invention, as shown in fig. 3, an inner extending plate 2A1 is disposed on the housing 2A, the inner extending plate 2A1 extends along an inner wall of the housing 2A in a direction away from the housing 2A to form a fifth central hole 2AA, the fifth central hole 2AA is matched with the shaft diameter 1a1, and the water-cooling sleeve 12A and the first protective sheath 13A are both abutted against the inner extending plate 2A1. It can be understood that the lower ends of the water-cooling sleeve 12A and the first protective sleeve 13A are pressed against the inner extending plate 2A1, so that when the shell 2A is lifted, the water-cooling sleeve 12A, the first protective sleeve 13A and the second protective sleeve 14A are lifted synchronously with the shell 2A; specifically, during the lifting, the water-cooled jacket 12A and the first protective jacket 13A are lifted along with the housing 2A under the support of the inner extension plate 2A1, and since the inner diameter of the upper end of the inner wall of the first protective jacket 13A is larger than the inner diameter of the lower end thereof, and the outer diameter of the upper end of the outer wall of the second protective jacket 14A matching therewith is larger than the outer diameter of the lower end thereof, the inner wall of the first protective jacket 13A can clamp the second protective jacket 14A, so that the second protective jacket 14A is lifted together with the first protective jacket 13A.
In another embodiment of the present invention, the shell 2A, the water-cooling sleeve 12A and the first protection sleeve 13A may also be connected by a connection structure, for example, the connection between the shell 2A and the water-cooling sleeve 12A is taken as an example for illustration here, the connection structure includes a chute arranged on the inner wall of the shell 2A and a protrusion which is connected to the chute and arranged on the outer wall of the water-cooling sleeve 12A, the chute extends from the upper end of the shell to the lower end of the shell 2A, and penetrates through the upper end edge of the shell 2A but not the lower end edge of the shell 2A, and the lower end of the chute extends to a position where the water-cooling sleeve 12A is flush with the lower end of the shell 2A when installed in the chute, which is simple and reliable; it should be noted that the sliding groove may also be disposed on the outer wall of the water-cooling sleeve 12A, and the protrusion may also be disposed on the inner wall of the casing 2A, which is not limited in the present invention; the water-cooling sleeve 12A and the first protection sleeve 13A may also be connected by such a connection structure, which is not described herein again.
Preferably, as shown in fig. 3, the base 7a1 and the flat car 1A are adjustably connected by an adjusting bolt 7a11, specifically, a plurality of third positioning holes are provided on the base 7a1, a plurality of fourth positioning holes are provided on the flat car 1A, the plurality of third positioning holes and the plurality of fourth positioning holes are in one-to-one correspondence, the adjusting bolt 7a11 sequentially passes through the third positioning holes and the fourth positioning holes, more specifically, a plurality of lugs are provided in the circumferential direction of the base 7a1, and the third positioning holes are provided on the lugs. Through the connection of the adjustable adjusting bolt 7A11, the height of the base 7A1 in the up-and-down direction can be adjusted according to the practical situation of the experiment, and then the coal rock sample 8A is adjusted to a proper position.
In an embodiment of the present invention, as shown in fig. 1, a hanging lug 18A is fixed at an upper end of the confining pressure end cover 3A, and the hanging lug 18A is arranged on the confining pressure end cover 3A to facilitate lifting of the confining pressure end cover 3A, and preferably, a plurality of hanging lugs 18A are symmetrically arranged on the confining pressure end cover 3A, so that the force applied to the confining pressure end cover 3A during lifting is more uniform.
Preferably, the water passage groove 12A1 is formed in a spiral shape, and is wound from the upper end of the water cooling jacket 12A to the lower end of the water cooling jacket 12A, and the water passage groove 12A1 is formed in a spiral shape, so that the length of the water passage groove 12A1 is increased, thereby making it possible to extend the cooling time of the cooling water.
Preferably, the piston part 4A2 and the outer peripheral wall of the water-cooling sleeve 12A are further sleeved with a sealing ring 19A, and the sealing ring 19A is sleeved on the outer peripheral wall of the piston part 4A2 and the outer peripheral wall of the water-cooling sleeve 12A, so that the sealing performance between the confining pressure piston 4A and the confining pressure end cover 3A can be ensured, and the oil is prevented from leaking in the confining pressure oil cavity; and the cooling water in the water passage tank 12A1 of the water-cooling jacket 12A can be prevented from leaking, and further, it is preferable that the water-cooling jacket 12A is provided with a seal ring 19A at each of the upper and lower ends thereof. Furthermore, a plurality of sealing rings 19 are arranged between the upper pressure head 15A1 and the upper pressure rod 15A2, between the upper pressure rod 15A2 and the confining pressure head 5A, between the confining pressure head 5A and the graphite tube 6a1, between the confining pressure cushion 7A3 and the lower pressure rod 7a2, between the confining pressure cushion 7A3 and the insulating ring 10A, between the insulating ring 10A and the graphite tube 6a1, and between the lower pressure rod 7a2 and the base 7a1.
In order to achieve the purpose, the invention provides a coal rock high-temperature high-pressure deformation test method, which comprises the following steps:
s1: sample loading: firstly, spraying high-temperature and high-pressure resistant lubricant on the inner wall of the first graphite pipe 6A2 and the outer wall of the second graphite pipe 6A3, sleeving a mold in a cavity 6AA formed between the first graphite pipe 6A2 and the second graphite pipe 6A3, then filling pyrophyllite powder in the mold, and pressing the pyrophyllite powder into a plurality of pyrophyllite sleeves 6A4 in a segmented manner for more truly simulating geological conditions; the corundum pad 9A is arranged on the upper end face of the lower pressure rod 7A2, the coal rock sample 8A is arranged on the corundum pad 9A, and more specifically, the corundum pad 9A can play a role in heat insulation.
S2: installation: a water-cooling sleeve 12A, a first protective sleeve 13A and a second protective sleeve 14A are sleeved between the shell 2A and the sample sleeve 6A1 in sequence from outside to inside; sleeving the confining pressure piston 4A into the second central hole 3A1, connecting the upper end of the confining pressure head 5A to the lower end of the confining pressure piston 4A, and coaxially arranging the second central hole 3A1, the third central hole 4AA and the fourth central hole 5A 1; then, the combined confining pressure end cover 3A, confining pressure piston 4A and confining pressure head 5A enter the accommodating chamber from the upper opening of the accommodating chamber of the shell 2A, so that the lower end of the confining pressure head 5A is abutted against the pyrophyllite sleeve 6A4, and the confining pressure end cover 3A is connected with the shell 2A through a fixing piece; the upper pressure lever 15a2 and the upper pressure head 15a1 are then sequentially inserted into the third center hole 4AA and the fourth center hole 5a1.
S3: pressurizing and heating: the upper end of the upper pressure head 15A1 and the lower end of the base 7A1 are respectively provided with a pressure machine, when axial pressurization is carried out, the upper pressure head 15A1 moves downwards in the third central hole 4AA, at the moment, the upper pressure head 15A1 downwards presses the upper pressure rod 15A2 downwards in the fourth central hole 5A1, and therefore the upper pressure rod 15A2 downwards compresses the coal rock sample 8A; meanwhile, the base 7A1 moves upwards to drive the lower pressing rod 7A2 in the first central hole 1A11 to move upwards to compress the lower end face of the coal rock sample 8A; during confining pressure, hydraulic oil is injected from the oil inlet, the confining pressure piston 4A is pushed by the hydraulic oil to move downwards along the second center hole 3A1, the confining pressure head 5A at the lower end of the confining pressure piston 4A is driven to move downwards, and the pyrophyllite sleeve 6A4 is compressed by the confining pressure head 5A, so that the pyrophyllite sleeve 6A4 is compressed and deformed to transmit pressure transversely, and confining pressure is generated on the coal rock sample 8A; the electrode plate set 16A is opened to heat the coal rock sample 8A to simulate a high temperature environment. The coal rock sample 8A is in the ambient pressure, axial pressure and high temperature environment simultaneously, so that the geological environment can be simulated more accurately.
S4: sampling: the shell 2A and the flat car 1A are disassembled, the device at the upper part of the flat car 1A is integrally lifted, namely, the shell 2A, a confining pressure end cover 3A, a confining pressure piston 4A, a confining pressure head 5A, a water-cooling sleeve 12A, a first protective sleeve 13A, a second protective sleeve 14A, an upper pressure head 15A1 and an upper pressure rod 15A2 are lifted together, and then a mould is utilized to integrally take out a first graphite pipe 6A2, a pyrophyllite sleeve 6A4, a second graphite pipe 6A3, a coal rock sample 8A, a corundum pad 9A, an upper pressure rod 15A2 at the upper end of the coal rock sample 8A and a lower pressure rod 7A2 at the lower end of the coal rock sample 8A, namely a sample kit; the coal rock sample 8A was removed from the sample kit using a cutting tool. Specifically, as shown in fig. 4, the mold 300 includes a first mold 1C and a second mold 2C, the first mold 1C is a tubular structure and has a cavity 1C1 inside, and the sample set is inverted when the coal rock sample 8A is taken, i.e. the upper press rod 15a2 is downward and the lower press rod 7a2 is upward. The first die 1C is arranged at the upper end of the inverted sample suite, the second die 2C is arranged at the lower end of the inverted sample suite, the sample sleeve 6a1 is pressed against the lower end of the first die, the second die 2C is pressed against the pyrophyllite sleeve 6a4, the first die 1C and the second die 2C are pressurized by opposite pressure 3C, the pyrophyllite sleeve 6a4, the second graphite tube 6A3, the coal rock sample 8A and the corundum pad 9A move upwards under the action of the second die 2C to enter the cavity 1C1 of the first die 1C, and then the coal rock sample 8A is taken out by using a cutting tool. Note that a through hole 2C3 penetrating vertically is provided in the center axis of the second mold 2C, and the through hole 2C3 is adapted to engage with the upper press rod 15a2. In order to take samples more rightly, the spring 2C1 is sleeved outside the second mold 2C, so that one end of the spring 2C1 abuts against the base 2C2 of the second mold 2C, and the other end of the spring abuts against the sample sleeve 6a1, thereby preventing the sample sleeve 6a1 from suddenly dropping in the sample withdrawing process and further influencing the integrity of the coal rock sample 8A. The method can obtain the complete coal rock sample 8A, is convenient to operate, and is safer and more reliable.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. The utility model provides a coal petrography high temperature high pressure deformation test device which characterized in that includes:
the flat car (1A), the flat car (1A) is movably arranged on the track, and a first central hole (1A11) which is through up and down is arranged on the flat car;
the device comprises a shell (2A), wherein an accommodating cavity is arranged in the shell (2A), and the lower end part of the shell is connected with a flat car (1A);
the confining pressure end cover (3A) is fixed at the upper end part of the accommodating cavity, and is provided with a second central hole (3A1) and an oil inlet hole (3A2) which are vertically penetrated;
the confining pressure piston (4A) comprises a rod part (4A1) matched with the second center hole (3A1) and a piston part (4A2) integrally formed at the lower end of the rod part (4A1), and a third center hole (4AA) which is vertically communicated is formed in the confining pressure piston (4A);
the confining pressure head (5A) is fixed at the lower end of the piston part (4A2), a fourth central hole (5A1) which is through up and down is formed in the confining pressure head (5A), and the fourth central hole (5A1), the third central hole (4AA), the second central hole (3A1) and the first central hole (1A11) are coaxially arranged;
a graphite tube assembly (6A), the graphite tube assembly (6A) comprising: the sample sleeve (6A1), the first graphite tube (6A2), the second graphite tube (6A3) and the pyrophyllite sleeve (6A4), wherein the sample sleeve (6A1) is coaxially arranged at the upper end of the first central hole (1A11) and is fixedly connected with the flat trolley (1A); the first graphite tube (6A2) is arranged along the inner wall of the sample sleeve (6A1), the second graphite tube (6A3) is sleeved inside the first graphite tube (6A2) and forms a cavity (6AA) with the first graphite tube (6A2), and the confining pressure head (5A) is matched with the cavity (6 AA); the pyrophyllite sleeve (6A4) is filled in the cavity (6 AA);
a lower axial pressure loading unit (7A), the lower axial pressure loading unit (7A) comprising: the coal rock sample testing device comprises a base (7A1) and a lower pressing rod (7A2), wherein the base (7A1) is connected with the flat trolley (1A), the lower pressing rod (7A2) is matched with the first central hole (1A11), one end of the lower pressing rod is connected with the base (7A1), the other end of the lower pressing rod is matched with a second graphite pipe (6A3), a coal rock sample (8A) is arranged at the upper end of the lower pressing rod (7A2), a confining pressure cushion block (7A3) is coaxially arranged with the lower pressing rod (7A2) and is positioned at the lower end of the second graphite pipe (6A3), and an insulating ring (10A) is arranged between the confining pressure (7A3) and a sample sleeve cushion block (6A 1); a mica sheet (11A) is arranged between the pyrophyllite sleeve (6A4) and the confining pressure cushion block (7A3), and an insulating sleeve (20A) is arranged between the first central hole (1A11) and the lower pressure rod (7A 2);
the water-cooling sleeve (12A), the first protecting sleeve (13A) and the second protecting sleeve (14A) are sequentially sleeved between the shell (2A) and the sample sleeve (6A1) from outside to inside, the water-cooling sleeve (12A) and the first protecting sleeve (13A) are connected with the shell (2A), the inner diameter of the upper end of the inner wall of the first protecting sleeve (13A) is larger than the inner diameter of the lower end of the inner wall of the first protecting sleeve, and the outer wall of the second protecting sleeve (14A) is matched with the first protecting sleeve (13A); the outer wall of the water-cooling sleeve (12A) is provided with a water through groove (12A 1);
an upper axial pressure loading unit (15A), the upper axial pressure loading unit (15A) comprising: an upper pressure head (15A1) and an upper pressure rod (15A2), wherein the upper pressure head (15A1) is matched with the third central hole (4 AA); an upper pressure rod (15A2) is matched with the fourth center hole (5A1), one end of the upper pressure rod is connected to the lower end of the upper pressure head (15A1), and the other end of the upper pressure rod is matched with the second graphite tube (6A3) and abuts against the coal rock sample (8A);
the collecting pipe group (AA) comprises a first collecting pipe (AA1) and a second collecting pipe (AA2), the first collecting pipe (AA1) sequentially penetrates through the upper pressure head (15A1) and the upper pressure rod (15A2), one end of the first collecting pipe is connected to the upper end of the coal rock sample (8A), and the other end of the first collecting pipe is a first collecting opening (AA11) located on the upper pressure head (15A 1); a second collecting pipe (AA2) sequentially penetrates through the base (7A1) and the lower pressing rod (7A2), one end of the second collecting pipe is connected to the lower end of the coal rock sample (8A), and the other end of the second collecting pipe is a second collecting opening (AA21) located on the base (7A 1); and
the electrode plate group (16A) comprises an upper electrode plate (16A1) connected with the upper pressure head (15A1) and a lower electrode plate (16A2) connected with the base (7A1), and the positive electrode of the power supply is sequentially communicated with the upper pressure head (15A1), the upper pressure rod (15A2) and the confining pressure head (5A) to the upper end of the graphite tube assembly (6A) through the upper electrode plate (16A 1); and the negative electrode of the power supply is sequentially communicated with the base (7A1), the lower pressure rod (7A2) and the confining pressure cushion block (7A3) to the lower end of the graphite tube assembly (6A) through a lower electrode plate (16A2) so as to heat the coal rock sample (8A).
2. The coal rock high-temperature high-pressure deformation test device according to claim 1, wherein the test device (100) further comprises a guide rod (17A), the flat car (1A) is connected with the shell (2A) through the guide rod (17A), at least two first positioning holes which are symmetrically arranged are arranged on the flat car (1A), a second positioning hole corresponding to the first positioning hole is arranged on the shell (2A), and the guide rod (17A) sequentially penetrates through the second positioning hole and the first positioning hole.
3. The coal petrography high temperature and high pressure deformation test device of claim 2, characterized in that, the flatbed cart (1A) includes:
a shaft diameter (1A1), the first center hole (1A11) being provided on the shaft diameter (1A 1);
the flange (1A2), flange (1A2) is outwards extended from the periphery wall of axle diameter (1A1), and a plurality of first locating holes are arranged on flange (1A 2).
4. The coal rock high-temperature high-pressure deformation test device according to claim 3, wherein an inner extending plate (2A1) is arranged on the casing (2A), the inner extending plate (2A1) deviates from the casing (2A) along the inner wall of the casing (2A) and extends towards the center direction of the casing (2A) to form a fifth central hole (2AA), the fifth central hole (2AA) is matched with the shaft diameter (1A1), and the water-cooling sleeve (12A) and the first protection sleeve (13A) are abutted against the inner extending plate (2A 1).
5. The coal petrography high temperature and high pressure deformation test device of claim 2, characterized in that, adjustable connection is passed through adjusting bolt (7A11) between base (7A1) and the flatbed dolly (1A).
6. The coal rock high-temperature high-pressure deformation test device as claimed in any one of claims 1 to 5, wherein a hanging lug (18A) is fixed to the upper end of the confining pressure end cover (3A).
7. The coal petrography high temperature and high pressure deformation test device of any one of claims 1 to 5, characterized in that, the water trough (12A1) is spiral, and is wound from the upper end of the water cooling sleeve (12A) to the lower end thereof.
8. The coal petrography high temperature and high pressure deformation test device of any claim 1 to claim 5, characterized in that, the outer peripheral wall of the piston portion (4A2) and the water-cooling sleeve (12A) is further sleeved with a sealing ring (19A).
9. A coal rock high-temperature high-pressure deformation test method is characterized by being tested by using the coal rock high-temperature high-pressure deformation test device as claimed in claim 1, and comprising the following steps:
s1: sample loading: firstly, high-temperature and high-pressure resistant lubricants are sprayed on the inner wall of a first graphite pipe (6A2) and the outer wall of a second graphite pipe (6A3), a mold is sleeved in a cavity (6AA) formed between the first graphite pipe (6A2) and the second graphite pipe (6A3), pyrophyllite powder is filled in the mold, and in order to simulate geological conditions more truly, the pyrophyllite powder is pressed into a plurality of pyrophyllite sleeves (6A4) in a segmented mode; a corundum pad (9A) is arranged on the upper end surface of the lower pressure rod (7A2), and a coal rock sample (8A) is arranged on the corundum pad (9A);
s2: installation: a water-cooling sleeve (12A), a first protective sleeve (13A) and a second protective sleeve (14A) are sleeved between the shell (2A) and the sample sleeve (6A1) from outside to inside in sequence; sleeving a confining pressure piston (4A) into a second center hole (3A1), connecting the upper end of a confining pressure head (5A) to the lower end of the confining pressure piston (4A), and coaxially arranging a second center hole (3A1), a third center hole (4AA) and a fourth center hole (5A 1); then, enabling the combined confining pressure end cover (3A), confining pressure piston (4A) and confining pressure head (5A) to enter an accommodating chamber from an upper opening of the accommodating chamber of the shell (2A), enabling the lower end of the confining pressure head (5A) to abut against the pyrophyllite sleeve (6A4), and enabling the confining pressure end cover (3A) and the shell (2A) to be connected through a fixing piece; then an upper pressure rod (15A2) and an upper pressure head (15A1) are sequentially arranged in the third central hole (4AA) and the fourth central hole (5A 1);
s3: pressurizing and heating: the upper end of the upper pressure head (15A1) and the lower end of the base (7A1) are respectively provided with a press machine, when axial pressurization is carried out, the upper pressure head (15A1) moves downwards in the third central hole (4AA), at the moment, the upper pressure head (15A1) presses the upper pressure rod (15A2) downwards and moves downwards in the fourth central hole (5A1), and therefore the upper pressure rod (15A2) compresses the coal rock sample (8A) downwards; meanwhile, the base (7A1) moves upwards to drive the lower pressure rod (7A2) located in the first central hole (1A11) to move upwards to compress the lower end face of the coal rock sample (8A); hydraulic oil is injected from the oil inlet, the hydraulic oil pushes the confining pressure piston (4A) to move downwards along the second center hole (3A1), the confining pressure head (5A) positioned at the lower end of the confining pressure piston (4A) is driven to move downwards, and the pyrophyllite sleeve (6A4) is compressed by the confining pressure head (5A), so that the pyrophyllite sleeve (6A4) is compressed and deformed to transmit pressure transversely, and confining pressure is generated on the coal rock sample (8A); starting the electrode plate group (16A) to heat the coal rock sample (8A);
s4: sampling: the method comprises the steps of disassembling a shell (2A) from a flat trolley (1A), integrally hoisting a device on the upper portion of the flat trolley (1A), namely hoisting the shell (2A), a confining pressure end cover (3A), a confining pressure piston (4A), a confining pressure head (5A), a water-cooling sleeve (12A), a first protective sleeve (13A), a second protective sleeve (14A), an upper pressure head (15A1) and an upper pressure rod (15A2) together, then taking out a first graphite pipe (6A2), a pyrophyllite sleeve (6A4), a second graphite pipe (6A3), a coal rock sample (8A) and a corundum pad (9A) in a sample sleeve (6A1) by using a die (300), and taking out the coal rock sample (8A) by using a cutting tool.
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| CN110044686B (en) * | 2019-04-29 | 2020-12-08 | 合肥工业大学 | Portable triaxial stress-strain testing device loaded by counter-force |
| CN112179748B (en) * | 2020-10-12 | 2023-06-09 | 河南理工大学 | CT triaxial experiment sample loading method for coal rock sample |
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