CN117110065A - Triaxial pressure chamber for cyclic load creep test - Google Patents
Triaxial pressure chamber for cyclic load creep test Download PDFInfo
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- CN117110065A CN117110065A CN202311263526.4A CN202311263526A CN117110065A CN 117110065 A CN117110065 A CN 117110065A CN 202311263526 A CN202311263526 A CN 202311263526A CN 117110065 A CN117110065 A CN 117110065A
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- 238000010438 heat treatment Methods 0.000 claims description 27
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Classifications
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- G—PHYSICS
- 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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- 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
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The disclosure relates to the technical field of rock creep tests, in particular to a triaxial pressure chamber for a cyclic load creep test. The application provides a triaxial pressure chamber for a cyclic load creep test, which comprises a pressure chamber body and a piston, wherein the piston limits the pressure chamber body into a confining pressure cavity and a shaft pressure cavity, the confining pressure cavity is provided with an oil injection and discharge interface, an air injection and discharge interface and a sample mounting position, and pressure liquid enters the confining pressure cavity through the oil injection and discharge interface to apply confining pressure to a sample on the sample mounting position; the oil injection and exhaust interface is arranged at one end of the confining pressure cavity close to the shaft pressure cavity, and the oil injection and exhaust interface is arranged at the opposite other end; the axial pressure cavity is provided with an axial pressure interface, and pressure liquid enters the axial pressure cavity through the axial pressure interface so that the piston applies axial pressure to the sample. By implementing the technical scheme disclosed by the application, the triaxial test requirement can be met, and the stress condition which is suitable for the actual occurrence condition of the salt cavern surrounding rock is provided.
Description
Technical Field
The disclosure relates to the technical field of rock creep tests, in particular to a triaxial pressure chamber for a cyclic load creep test.
Background
The rock salt becomes an ideal medium for petroleum and natural gas storage, compressed air energy storage and other engineering due to its low permeability, good creep property and damage self-repairing property. When the salt cavern gas storage runs, the internal pressure of the cavity can rise and fall along with the gas injection and production process, so that the cavity surrounding rock is subjected to the action of cyclic load for a long time.
At present, the creep mechanism and rule of the salt rock under the long-term action of the ultralow frequency cyclic load are still studied freshly, creep mechanism and parameters can only be achieved by means of constant load creep achievements, and long-term creep test research under the ultralow frequency load is forced. However, the existing creep testers all adopt constant load loading, so that creep research under ultralow frequency cyclic load is difficult to develop stably, and the existing creep testers often only can provide uniaxial loading conditions and cannot meet triaxial test and high-temperature requirements, so that stress and temperature conditions suitable for actual occurrence conditions of salt cavern surrounding rocks cannot be provided.
For the reasons mentioned above, it is needed to provide a triaxial pressure chamber for cyclic load creep test, which is used for systematically developing the creep behavior of salt rock under ultralow frequency cyclic load.
Disclosure of Invention
The present disclosure is directed to solving at least one of the technical problems existing in the prior art or related art.
For this purpose, the present disclosure provides a triaxial pressure chamber, including a pressure chamber body and a piston, where the piston is configured to define a confining pressure cavity and an axial pressure cavity inside the pressure chamber body, where the confining pressure cavity and the axial pressure cavity are configured to accommodate pressure liquid, where the confining pressure cavity has an oil injection and discharge interface, an air injection and discharge interface, and a sample mounting position, where the sample mounting position is configured to carry the sample in the confining pressure cavity, the air injection and discharge interface is disposed at one end of the confining pressure cavity near the axial pressure cavity, and the oil injection and discharge interface is disposed at the other end of the confining pressure cavity;
the axial pressure cavity is provided with an axial pressure interface, the axial pressure interface is used for inputting the pressure liquid, and the piston is used for applying axial pressure to the sample.
In a possible embodiment, the confining pressure chamber is further provided with a confining pressure interface for inputting or discharging the pressure liquid into the confining pressure chamber.
In a possible embodiment, the confining pressure interface is arranged on a side wall of the confining pressure chamber, and the confining pressure interface faces the side wall of the sample.
In a possible embodiment, a balance cavity is further arranged in the pressure chamber body, the balance cavity is arranged between the axial pressure cavity and the confining pressure cavity, the confining pressure cavity is communicated with the balance cavity through a piston channel, and the piston channel is arranged inside the piston.
In a possible embodiment, the piston is adapted to define the balancing chamber as a first chamber and a second chamber, wherein,
the first chamber is provided with a balance chamber exhaust hole which is used for exhausting air in the first chamber;
the second chamber is close to the shaft pressure cavity, and the pressure liquid in the confining pressure cavity enters the second chamber through the piston channel.
In one possible embodiment, a heating element for adjusting the temperature of the pressure fluid and a temperature sensor for monitoring the temperature of the pressure fluid are arranged around the sample mounting point.
In a possible implementation manner, the device further comprises a heat preservation sleeve, wherein the heat preservation sleeve is sleeved on the outer wall of the confining pressure cavity.
In a possible implementation manner, a base is arranged at the bottom of the pressure chamber body, one end of the base is embedded into the pressure chamber body, the sample mounting position is arranged on the end face of the base embedded into the confining pressure cavity, and the oil injection and discharge interface is arranged inside the base.
In a possible embodiment, the base is detachably connected to the pressure chamber body.
In a possible embodiment, the portion of the piston in contact with the inner wall of the pressure chamber body is provided with a sealing ring.
Compared with the prior art, the method at least comprises the following beneficial effects: the piston of the present disclosure defines the pressure chamber body into a confining pressure cavity and an axial pressure cavity, and load pressure conveyed by the load generating device enters the axial pressure cavity through the axial pressure interface to apply acting force to the piston, so as to apply axial pressure to the sample; the confining pressure cavity is provided with an oil injection and discharge interface, an air injection and discharge interface, a confining pressure interface and a sample mounting position, and pressure liquid enters the confining pressure cavity through the confining pressure interface to apply confining pressure to a sample on the sample mounting position. Through the technical scheme of the present disclosure, the triaxial test requirement can be satisfied, and the stress adapted to the actual occurrence condition of the salt cavern surrounding rock is provided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the exemplary embodiments. The drawings are only for purposes of illustrating exemplary embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the accompanying drawings:
FIG. 1 is one of the structural schematic diagrams of the present disclosure;
FIG. 2 is a second schematic diagram of the structure of the present disclosure;
fig. 3 is a schematic view of the set positions of the axial displacement sensor and the circumferential displacement sensor of the present disclosure.
The correspondence between the reference numerals and the component names in fig. 1 to 3 is:
100-sample; 200-quick hoops; 300-balance cavity vent holes; 400-axial displacement sensor; 500-an annular displacement sensor;
1-a pressure chamber body; 11-confining pressure cavity; 111-oil filling and discharging interfaces; 112-gas injection and exhaust interface; 113-sample mounting location; 114-confining pressure interface; 12-shaft pressure cavity; 121-an axial compression interface; 13-balancing the cavity; 131-a first chamber; 132-a second chamber; 15-heating element; 16-heat preservation sleeve; 17-a base; 18-piston channels; 2-piston.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
The research on the fatigue property and the dynamic property of the rock and soil under the general stress cyclic load of the rock and soil mechanics is blank, and the research on the creep property of the rock and soil under the ultralow frequency cyclic load is generally represented by the fatigue property and the dynamic stability property of the periodic cyclic load related to the rock and soil mechanics. For example, the stability of the rock wall between the railway tunnel and the bottom karst cave in karst areas under the action of earthquake load and the action of long-term operation load of the train is a problem; under the action of earthquake, evaluating the safety of the building foundation and the upper structure; under the repeated action of dynamic stress, the problem of long-term stability of the ore pillar and the rock-soil mass, etc. The common earthquake load frequency range is about 0.5 Hz-20 Hz; the frequency range of the vehicle load and the wave load is about 0.1 Hz-10 Hz; the fatigue load frequency range of the rock-soil body is about 0.1 Hz-5 Hz. According to the periodic load acting frequency of the rock-soil body, the rock-soil body is divided into 5 grades of high frequency, medium-low frequency, low frequency and ultralow frequency. The conventional geotechnical mechanics rarely involves ultra-low frequency periodic loads, which are between constant (static) load and low frequency.
At present, creep mechanism and parameters can only be utilized by constant load creep achievements, and long-term creep test research under ultralow frequency load is urgent. However, the existing creep testers all adopt constant load loading, so that creep research under ultralow frequency cyclic load is difficult to develop stably, and the existing creep testers often only can provide uniaxial loading conditions and meet triaxial test and high-temperature requirements, so that stress and temperature conditions suitable for actual occurrence conditions of salt cavern surrounding rocks cannot be provided.
Based on the above, the embodiment of the disclosure provides a triaxial pressure chamber for a cyclic load creep test, which can meet the triaxial test requirement and the temperature requirement, and provide stress conditions and temperature conditions which are suitable for the actual occurrence conditions of salt cavern surrounding rock.
The triaxial pressure chamber for the cyclic load creep test is described in detail below by way of specific examples:
referring to fig. 1 to 3, the present disclosure provides a triaxial pressure chamber for a cyclic load creep test, including a pressure chamber body 1 and a piston 2, the piston 2 defining the pressure chamber body 1 into a confining pressure cavity 11 and an axial pressure cavity 12, the confining pressure cavity 11 having an oil injection and drainage port 111, an air injection and drainage port 112 and a sample mounting site 113, pressure liquid entering the confining pressure cavity 11 through the oil injection and drainage port 111 to apply confining pressure to a sample on the sample mounting site 113; the oil injection and exhaust interface 112 is arranged at one end of the confining pressure cavity 11 close to the shaft pressure cavity 12, and the oil injection and exhaust interface 111 is arranged at the opposite end; the axial pressure chamber 12 has an axial pressure port 121, and pressure fluid enters the axial pressure chamber 12 through the axial pressure port 121 to cause the piston 2 to apply axial pressure to the sample.
As illustrated in fig. 1, the function of the present disclosure is to apply a target stress to a rock sample. The present disclosure may achieve target loading conditions by applying various combinations of hydrostatic and deflection stresses to the test specimen. Specifically, the piston 2 of the present disclosure defines the space inside the pressure chamber body 1 into a confining pressure chamber 11 and an axial pressure chamber 12, wherein the axial pressure chamber 12 is disposed at the top of the pressure chamber body 1, and in some embodiments, a portion of the axial pressure chamber 12 is formed of a separate structure, which is connected to the pressure chamber body 1 by bolts, and its form and function are unchanged, which is intended to facilitate maintenance.
The confining pressure cavity 12 is arranged at the bottom of the pressure chamber body 1, and the piston 2 isolates the shaft pressure cavity 11 from the confining pressure cavity 12 so that the shaft pressure cavity and the confining pressure cavity are not communicated with each other. The confining pressure cavity 12 is provided with a sample mounting position 113, when the sample 100 is mounted at the sample mounting position 113, the periphery of the sample 100 is not contacted with the side wall of the confining pressure cavity 12, hydraulic oil can act on the periphery of the sample 100 after being filled into the confining pressure cavity 12 through the oil filling and discharging interface 111, and load pressure (hydraulic oil) conveyed by the load generating device enters the shaft pressure cavity 12 through the shaft pressure interface 121 to apply acting force to the piston 2, so that shaft pressure is applied to the sample 100. The sample mounting position 113 is arranged in the middle of the confining pressure cavity 11, the upper end and the lower end of the sample 100 are provided with solid metal pressure heads made of stainless steel materials, and the pressure heads and the sample 100 are positioned on the same axis. In order to isolate the sample 100 from the hydraulic oil in the confining pressure cavity 11, a heat shrinkage tube is used for sealing the sample 100. Annular grooves are formed in the annular directions of the upper pressure head and the lower pressure head, O-shaped rubber sealing rings are embedded into the grooves, and the sealing rings have heat resistance. The rock salt and the pressure head are sleeved by the heat shrinkage pipe, and the heat shrinkage pipe is closely attached to the sample 100 and the pressure head after being heated for a plurality of minutes, and the sealing ring is hooped by the metal hoop, so that the effect of sealing the sample 100 is achieved. After the sample is molded, the axial displacement sensor 400 and the annular displacement sensor 500 are mounted on the sample 100, and the annular displacement sensor 500 is fixed at a position intermediate the height of the sample 100. The sample 100 is placed in the sample mounting site 113, and the sensor lines are connected. The axial pressure to which the sample 100 is subjected is applied by the piston 2. The axial pressure applied to the sample 100 may be superimposed by a hydrostatic pressure exerted by the high pressure hydraulic oil in the pressure chamber 11 and an axial bias force exerted by the piston 2, the magnitude of which is equal to the oil pressure in the shaft pressure chamber. As shown in fig. 3, the axial displacement sensor 400 and the circumferential displacement sensor 500 are provided on the sample 100 to monitor the deformation amount of the sample 100.
The air injection and exhaust interface 112 of the present disclosure is disposed at the uppermost height of the confining pressure cavity 11, and is used for opening the air injection and exhaust interface 112 when injecting oil into the confining pressure cavity 11, and air in the confining pressure cavity 11 can be discharged from the air injection and exhaust interface 112 along with the rise of the hydraulic oil interface; when the confining pressure cavity 11 is filled with hydraulic oil, hydraulic oil stably flows out of the air injection and exhaust interface 112, so that the air injection and exhaust interface 112 also plays a role in judging whether the oil injection process is finished by observing whether hydraulic oil flows out of the air injection and exhaust interface 112 when the confining pressure cavity 11 is injected with oil. Further, the air injection and exhaust interface 112 is connected with a pipeline, so that hydraulic oil can be introduced into an external oil cylinder; after the test is completed, hydraulic oil needs to be discharged from the confining pressure cavity 11, the process needs to connect an air injection and exhaust interface 112 with an air compressor, the hydraulic oil in the confining pressure cavity 11 is driven out by high-pressure air, and a discharge channel of the hydraulic oil is an oil injection and exhaust interface 111. In some embodiments, the portion of the axial pressure chamber 12 is constituted by a separate structure, which is bolted to the pressure chamber body 1, with unchanged form and function, with the aim of facilitating maintenance.
The oil injection and discharge port 111 is arranged at the bottom of the confining pressure cavity 11, the oil injection and discharge port 111 is used for connecting an oil injection pump when injecting oil into the confining pressure cavity, hydraulic oil is injected into the confining pressure cavity 11 through the oil injection and discharge port 111, and air in the confining pressure cavity 11 can be discharged from an air injection and discharge port 112 at the top end of the confining pressure cavity 11; after the test is completed, hydraulic oil needs to be discharged from the confining pressure cavity 11, the oil filling and discharging interface 111 is a discharge channel of the hydraulic oil, the oil filling and discharging interface 111 is connected with an oil conveying pipeline, the hydraulic oil in the confining pressure cavity 11 can be discharged into an external oil tank, and the discharged hydraulic oil can be reused in the next test; when the hydraulic oil in the confining pressure cavity 11 is drained, the oil filling and discharging interface 111 does not output hydraulic oil any more, but the hydraulic oil is stable, and whether the oil discharging process is completed can be judged according to whether the stable air flow appears at the oil filling and discharging interface 111.
In some embodiments, the confining pressure chamber 11 of the present disclosure is further provided with a confining pressure interface 114, the confining pressure interface 114 being used to increase or decrease the load pressure into the confining pressure chamber 11.
In this embodiment, the load pressure of the confining pressure cavity 11 is poured into the confining pressure cavity 11 from the confining pressure interface 114 in the test process, and the extra interface is set to distinguish from the oil filling and discharging interface 111, so that the inaccuracy of monitoring data caused by the change of the pressure in the confining pressure cavity 11 due to the repeated dismounting and mounting of the connecting device at the same interface is avoided.
In some embodiments, confining pressure interface 114 is provided on a sidewall of confining pressure chamber 11, with confining pressure interface 114 facing the sidewall of the sample.
In this embodiment, the confining pressure interface 114 is disposed on the side wall of the confining pressure cavity 11, that is, the side wall of the pressure chamber body 1, and directly aligns with the side edge of the sample 100 to carry out load pressure delivery, so that the confining pressure cavity 11 can be more balanced when increasing or decreasing load pressure. Further, the confining pressure interface 114 is disposed at a central position in the extending direction of the sample 100, so that the sample 100 is more balanced in load pressure.
In some embodiments, a balance cavity 13 is further provided in the pressure chamber body 1, the balance cavity 13 is provided between the shaft pressure cavity 12 and the confining pressure cavity 11, the confining pressure cavity 11 and the balance cavity 13 are communicated through a piston channel 18, and the piston channel 18 is provided inside the piston 2.
As shown in fig. 1 and 2, the axial cross section of the piston 2 in this embodiment is in a cross shape, that is, the piston 2 is a cylinder with a thickened section in the middle, the diameters of the upper and lower end surfaces are the same, and are 100mm, and there is a part of the thickened section in the balance chamber, the diameter of the thickened section piston is 141.4mm, in this embodiment, the upper and lower cross sections are thinner, the diameter is 100mm, and the thickened section is thicker, and the cross section of the thickened section minus the cross section of the thinner end, that is, the protruding annular area is equal to the cross section of the thinner section. Thus, the vertical stress of the piston is 0. The annular area is equal to pi (141.42-1002) ≡10000 pi, and the area of the thinner end face is pi 1002, which are equal to each other, so that the above balance effect can be achieved. Wherein, the hoop of the section of thickening is equipped with the sealing washer for guarantee balanced chamber's seal. The piston 2 is provided with a piston channel 18, the piston channel 18 starts from the end face of the piston 2 close to the bottom of the confining pressure cavity 11, the end point is positioned at the upper end of the thickening section of the piston 2, and the piston channel 18 is communicated with the confining pressure cavity 11 and the balance cavity 13. The lower end face of the piston 2 is provided with a groove, and when the piston 2 is in close contact with the pressure head on the sample, hydraulic oil can flow into the piston channel 18 through the groove and then into the balance cavity 13. The purpose of the balancing chamber 13 is to achieve self-balancing of the confining pressure, i.e. zero force in the vertical direction, of the piston 2 when the confining pressure is applied. When the confining pressure P is applied to the confining pressure chamber 11, hydraulic oil flows into the balance chamber 13 along the piston passage 18. The cross section area of the thickened section of the piston 2 is 2 times of the area of the lower end surface of the piston, the protruding annular area of the thickened section is equal to the area of the lower end surface of the piston 2, the resultant force applied to the piston 2 in the vertical direction is zero, and the force applied to the rock sample is hydrostatic pressure with the size of P. Specifically, the downward pressure of the hydraulic oil in the balance cavity 13 to the piston 2 is balanced by the downward pressure of the hydraulic oil in the confining pressure cavity 13 to the piston 2, the downward pressure of the hydraulic oil in the balance cavity 13 to the piston 2 is equal to the upward pressure of the hydraulic oil in the confining pressure cavity 11 to the piston 2, the two pressures cancel each other, when the high-pressure hydraulic oil is added into the confining pressure cavity 11, the resultant force of the piston 2 in the vertical direction is zero, and the gravity of the piston 2 is far smaller than the force of the hydraulic oil in the confining pressure cavity 11 to the piston 2 during the test, so that the gravity of the piston 2 is ignored. Further, the confining pressure applied to the sample 100 is directly applied by the high-pressure hydraulic oil in the confining pressure chamber 11. The confining pressure cavity 11 is filled with high-pressure hydraulic oil, the pressure of the hydraulic oil is the target confining pressure P, the sample 100 is completely immersed in the high-pressure hydraulic oil, the pressure born by the sample is the hydrostatic pressure of P, the pressures born by the sample in all directions are equal, and the bearing direction is the normal direction of each point of the sample. The lower end face of the piston 2 receives pressure with the size of PA (A is the cross-sectional area of the lower end face of the axial loading piston) and vertically upwards in the direction, and the upper end face of the thickening section in the balance cavity 13 receives pressure with the size of PA '(A' is the annular area of the thickening section of the piston 2 in the balance cavity 13, namely the difference between the cross-sectional area of the thickening section and the cross-sectional area of the lower end face) and vertically downwards in the direction. Where a=a', the upward and downward pressures experienced by the axially loaded piston thus cancel each other out, and the pressure experienced by the axially loaded piston is zero.
In some embodiments, the piston 2 defines the balance chamber 13 as a first chamber 131 and a second chamber 132, the first chamber 131 being provided with a balance chamber vent 300, the balance chamber vent 300 being for venting air within the first chamber 131; the second chamber 132 is adjacent to the axial pressure chamber and the pressure fluid in the confining pressure chamber 11 enters the second chamber 132 through the piston channel.
In this embodiment, the first chamber 131 and the second chamber 132 are not communicated, the first chamber 131 is provided with the balance chamber vent 300, and when hydraulic oil enters the second chamber 132 through the piston passage 18, the piston moves downward so that air in the first chamber 131 is discharged from the balance chamber vent 300.
Further, the inside diameter of the axial compression chamber 12 is 80-120mm, the specific selection of 100mm in this disclosure, the inside diameter of the balancing chamber is 135-145mm, and the specific selection of 141.4mm in this disclosure. The bottom of the balance cavity 13 is provided with a balance cavity exhaust hole 300, which is used for ensuring that air in the balance cavity 13 below the first chamber 131 of the piston 2 can freely enter and exit when the axial loading piston 2 moves up and down; in the preparation stage before the test, the balance chamber vent 300 is connected to an air compressor, and the piston 2 is pushed up to the uppermost initial position by air pressure, so that the hydraulic oil or air in the balance chamber 13 is emptied. A circular opening is arranged between the confining pressure cavity 11 and the balance cavity 13, and the diameter of the opening is 100mm and is the same as that of the loading piston. The circular opening is provided with a sealing ring, and when the piston 2 is installed, the opening of the confining pressure cavity 11 and the balance cavity 13 form good sealing isolation.
In some embodiments, in order to meet the temperature requirement of the sample 100, the heating element 15 and the temperature sensor are disposed around the sample mounting location 113, the heating element 15 is used for adjusting the temperature of the pressure liquid, the temperature sensor is used for monitoring the temperature of the pressure liquid, and the monitored temperature data can be used as a basis for adjusting the temperature of the pressure liquid by the heating element. Further, when the ideal ambient temperature cannot be controlled, the present disclosure is provided with a thermal insulation sleeve 16 at a position of the pressure chamber body 1 corresponding to the confining pressure cavity 11.
The bottom surface of the confining pressure cavity 11 is distributed with a displacement and temperature sensor interface for connecting the axial displacement sensor 400, the annular displacement sensor 500 and the temperature sensor, and a sealing ring is arranged at the interface for maintaining the tightness in the confining pressure cavity.
Specifically, 4 heating elements 15 and 1 temperature sensor are arranged in the confining pressure cavity 11, and the heating elements 15 and the temperature sensors are fixed on the bottom surface of the confining pressure cavity 11. The heat preservation sleeve 16 is arranged on the outer side of the confining pressure cavity and completely wraps the confining pressure cavity, and the heat preservation sleeve is made of heat-insulating asbestos materials, so that a heat preservation effect can be effectively achieved. Wherein the heatable temperature is in the range of room temperature to 100 ℃. The heating system can be divided into two stages of heating and constant temperature when heating.
Heating: when the target temperature is set, the heating switch is turned on, and the heating element 15 starts to generate heat, so as to heat the hydraulic oil in the pressure chamber body 1, and the hydraulic oil with the increased temperature transfers heat into the sample 100. When the temperature sensor detects that the temperature of the hydraulic oil of the pressure chamber body 1 reaches the set target temperature, the heating controller issues a command to stop heating, and the heating member 15 is powered off to stop heating.
Constant temperature stage: after the heating member 15 stops heating, heat is transferred to the outside due to the fact that the temperature in the pressure chamber body 1 is higher than the temperature of the outside environment, and the temperature in the triaxial pressure chamber is lowered. In order to slow down the temperature falling speed in the confining pressure cavity 11, a heat preservation sleeve 16 is arranged outside the triaxial pressure chamber, and the heat preservation sleeve 16 is made of heat insulation asbestos materials, so that heat dissipation of the confining pressure cavity 11 to surrounding air can be effectively slowed down. When the temperature sensor detects that the temperature in the confining pressure cavity 11 is lower than the target temperature, the heating controller sends out a heating instruction, the heating piece 15 is electrified to heat, and when the temperature reaches the target temperature, the heating controller sends out a heating stopping instruction, and the heating piece 15 is powered off to stop heating. This is cycled to maintain a constant temperature within the confining pressure chamber 11. The temperature in the confining pressure cavity 11 in the constant temperature stage can be kept within the range of +/-0.1 ℃ of the target temperature.
In some embodiments, a base 17 is disposed at the bottom of the pressure chamber body 1, one end of the base 17 and the pressure chamber body 1 together form the confining pressure cavity 11, a sample mounting position 113 is disposed on an end surface of the base 17 embedded in the confining pressure cavity 11, and an oil filling and draining interface 111 is disposed inside the base 17.
In this embodiment, the bottom end of the confining pressure chamber 11 of the present disclosure is connected and sealed with a base 17, and the upper end of the base has a portion embedded in the confining pressure chamber 11. In order to avoid pressure relief, an annular sealing ring is arranged at the embedded part for sealing, so that the confining pressure cavity 11 is a closed cavity. Optionally, the pressure chamber body 1 and the base 17 are tightly fixed by a quick hoop, and after the confining pressure is applied, the pressure chamber body 1 and the base 17 may have a tendency to separate, and the quick hoop can fix the pressure chamber body 1 and bear the tensile force generated by the pressure chamber body 1 and the base 17. Further, the base 17 of the present disclosure is detachably connected to the pressure chamber body 1, so as to facilitate maintenance.
In this disclosure, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected;
"coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.
In the description of the present disclosure, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present disclosure.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely a preferred embodiment of the present disclosure, and is not intended to limit the present disclosure, so that various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A triaxial pressure chamber is characterized by comprising a pressure chamber body and a piston, wherein the piston is used for limiting the pressure chamber body to a confining pressure cavity and a shaft pressure cavity, the confining pressure cavity and the shaft pressure cavity are used for containing pressure liquid, and the pressure liquid is filled in the confining pressure cavity and the shaft pressure cavity,
the confining pressure cavity is provided with an oil injection and discharge interface, an oil injection and discharge interface and a sample installation position, the sample installation position is used for bearing the sample in the confining pressure cavity, the oil injection and discharge interface is arranged at one end of the confining pressure cavity, which is close to the shaft pressure cavity, and the oil injection and discharge interface is arranged at the other end of the confining pressure cavity;
the axial pressure cavity is provided with an axial pressure interface, the axial pressure interface is used for inputting the pressure liquid, and the piston is used for applying axial pressure to the sample.
2. The triaxial pressure chamber for cyclic load creep test according to claim 1, wherein the confining pressure cavity is further provided with confining pressure ports for inputting or exhausting the pressure liquid into the confining pressure cavity.
3. The triaxial pressure cell of cyclic load creep test according to claim 2, wherein the confining pressure interface is provided on a side wall of the confining pressure cavity and the confining pressure interface is directed towards a side wall of the sample.
4. The triaxial pressure chamber for cyclic load creep test according to claim 1, wherein a balance cavity is further provided in the pressure chamber body, the balance cavity is provided between the axial pressure cavity and the confining pressure cavity, the confining pressure cavity and the balance cavity are communicated through a piston channel, and the piston channel is provided inside the piston.
5. The triaxial pressure chamber for cyclic load creep test according to claim 4, wherein the piston is configured to define the balance cavity as a first chamber and a second chamber, wherein,
the first chamber is provided with a balance chamber exhaust hole which is used for exhausting air in the first chamber;
the second chamber is close to the shaft pressure cavity, and the pressure liquid in the confining pressure cavity enters the second chamber through the piston channel.
6. The triaxial pressure chamber for cyclic load creep test according to claim 1, wherein a heating member for adjusting the temperature of the pressure liquid and a temperature sensor for monitoring the temperature of the pressure liquid are provided around the sample mounting site.
7. The triaxial pressure chamber for cyclic load creep test according to claim 6, further comprising a thermal insulation sleeve, wherein the thermal insulation sleeve is sleeved on the outer wall of the confining pressure cavity.
8. The triaxial pressure chamber for the cyclic load creep test according to claim 1, wherein a base is arranged at the bottom of the pressure chamber body, one end of the base is embedded in the pressure chamber body, the sample mounting position is arranged on the end face of the base embedded in the confining pressure cavity, and the oil injection and discharge interface is arranged inside the base.
9. The triaxial pressure cell of cyclic load creep test according to claim 8, wherein the base is detachably connected to the pressure cell body.
10. Triaxial pressure chamber for cyclic load creep test according to any one of claims 1 to 9, characterized in that the part of the piston in contact with the inner wall of the pressure chamber body is provided with a sealing ring.
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| CN202311263526.4A CN117110065A (en) | 2023-09-27 | 2023-09-27 | Triaxial pressure chamber for cyclic load creep test |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032579A (en) * | 2012-12-20 | 2013-04-10 | 武汉大禹阀门股份有限公司 | Pressure air intake and exhaust volume amplifying device of exhaust valve |
| CN108020470A (en) * | 2017-11-15 | 2018-05-11 | 东北大学 | A kind of rock triaxial pressure machine for being used to simulate super-pressure and high temperature geological conditions |
| CN108956312A (en) * | 2018-05-15 | 2018-12-07 | 中国矿业大学 | A kind of small-sized triaxial fluid structurecoupling tester |
| CN110470529A (en) * | 2019-09-19 | 2019-11-19 | 中国科学院武汉岩土力学研究所 | Rock indirect tensile strength test method under three-dimensional stress constraint |
| WO2020029497A1 (en) * | 2018-08-06 | 2020-02-13 | Xi'an University Of Science And Technology | A seepage-creep and mechanical experimental system for coal and rock mass containing gas under triaxial loading in low-temperature environment |
| CN211955021U (en) * | 2020-04-28 | 2020-11-17 | 长春新试验机有限责任公司 | Better triaxial confined pressure chamber of stability and suitability |
| CN112014227A (en) * | 2020-08-28 | 2020-12-01 | 东北大学 | Self-balancing active unloading actuator for piston rod and use method |
| CN212748564U (en) * | 2020-07-27 | 2021-03-19 | 湖南有道设备制造有限公司 | Integrated rock triaxial loading system and rock triaxial test system |
| CN214304220U (en) * | 2020-11-30 | 2021-09-28 | 固耐重工（苏州）有限公司 | High-pressure cylinder body structure with balance cavity |
| WO2021248735A1 (en) * | 2020-06-08 | 2021-12-16 | 山东科技大学 | Pressure maintaining device in rock creep impact and micro-crack scanning experiment, and experimental method |
| CN215727252U (en) * | 2021-07-30 | 2022-02-01 | 中国石油化工股份有限公司 | Rock creep and salt dissolution integrated pressure-bearing test device |
| CN114320834A (en) * | 2022-01-11 | 2022-04-12 | 宝鸡市博磊化工机械有限公司 | Piston compressor high pressure stage balance cavity arrangement structure |
-
2023
- 2023-09-27 CN CN202311263526.4A patent/CN117110065A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032579A (en) * | 2012-12-20 | 2013-04-10 | 武汉大禹阀门股份有限公司 | Pressure air intake and exhaust volume amplifying device of exhaust valve |
| CN108020470A (en) * | 2017-11-15 | 2018-05-11 | 东北大学 | A kind of rock triaxial pressure machine for being used to simulate super-pressure and high temperature geological conditions |
| CN108956312A (en) * | 2018-05-15 | 2018-12-07 | 中国矿业大学 | A kind of small-sized triaxial fluid structurecoupling tester |
| WO2020029497A1 (en) * | 2018-08-06 | 2020-02-13 | Xi'an University Of Science And Technology | A seepage-creep and mechanical experimental system for coal and rock mass containing gas under triaxial loading in low-temperature environment |
| CN110470529A (en) * | 2019-09-19 | 2019-11-19 | 中国科学院武汉岩土力学研究所 | Rock indirect tensile strength test method under three-dimensional stress constraint |
| CN211955021U (en) * | 2020-04-28 | 2020-11-17 | 长春新试验机有限责任公司 | Better triaxial confined pressure chamber of stability and suitability |
| WO2021248735A1 (en) * | 2020-06-08 | 2021-12-16 | 山东科技大学 | Pressure maintaining device in rock creep impact and micro-crack scanning experiment, and experimental method |
| CN212748564U (en) * | 2020-07-27 | 2021-03-19 | 湖南有道设备制造有限公司 | Integrated rock triaxial loading system and rock triaxial test system |
| CN112014227A (en) * | 2020-08-28 | 2020-12-01 | 东北大学 | Self-balancing active unloading actuator for piston rod and use method |
| CN214304220U (en) * | 2020-11-30 | 2021-09-28 | 固耐重工（苏州）有限公司 | High-pressure cylinder body structure with balance cavity |
| CN215727252U (en) * | 2021-07-30 | 2022-02-01 | 中国石油化工股份有限公司 | Rock creep and salt dissolution integrated pressure-bearing test device |
| CN114320834A (en) * | 2022-01-11 | 2022-04-12 | 宝鸡市博磊化工机械有限公司 | Piston compressor high pressure stage balance cavity arrangement structure |
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