CN111323310B - Experimental device and method for soft rock loading and unloading plastic creep simulation - Google Patents

Experimental device and method for soft rock loading and unloading plastic creep simulation Download PDF

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CN111323310B
CN111323310B CN202010297194.1A CN202010297194A CN111323310B CN 111323310 B CN111323310 B CN 111323310B CN 202010297194 A CN202010297194 A CN 202010297194A CN 111323310 B CN111323310 B CN 111323310B
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sample
pressure
axial
radial
strain
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CN111323310A (en
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林晓
高军
谭发刚
黎建华
马建忠
蔡荣喜
王东旭
杨立云
贾超
李波
汤宇
陈拥军
王伟
杨文龙
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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
    • 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
    • G01N3/04—Chucks
    • 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
    • G01N3/06—Special adaptations of indicating or recording means
    • 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
    • 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
    • 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
    • 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
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0266—Cylindrical specimens
    • 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
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils

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  • Life Sciences & Earth Sciences (AREA)
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Abstract

The invention provides a device and a method for soft rock loading and unloading plastic creep simulation experiment, wherein the device comprises: the sample clamp is used for clamping a pre-manufactured soft rock sample and detecting axial pressure, radial pressure, and generated axial strain and radial strain of the sample during a plastic creep simulation experiment; the pressurizing machine table is used for applying axial pressure to the sample clamped by the sample clamp; and the control terminal is respectively electrically connected with the pressurizing machine platform and the sample clamp, is used for acquiring the axial pressure, the radial pressure, the axial strain and the radial strain detected by the sample clamp, and is also used for sending a starting or stopping instruction to the pressurizing machine platform according to the axial pressure, the radial pressure, the axial strain and the radial strain. The experimental device and the method for the loading and unloading plastic creep simulation of the soft rock test the plastic creep of the soft rock, and are convenient for determining the long-term strength of the soft rock according to the plastic creep of the soft rock in actual engineering.

Description

Experimental device and method for soft rock loading and unloading plastic creep simulation
Technical Field
The invention relates to the technical field of geotechnical engineering plastic creep simulation experiments, in particular to a plastic creep simulation experiment device and method for loading and unloading soft rock.
Background
At present, along with the rapid development and construction of engineering in the fields of water conservancy and hydropower, energy, traffic and the like, the long-term safety of rock mass structures such as tunnels, slopes and the like involved in large-scale engineering under the action of load is particularly important. In order to evaluate the long-term safety of rock mass structure, one of the important parameters is the long-term strength of the rock mass. Therefore, a device and a method for soft rock loading and unloading plastic creep simulation experiment are needed to determine the long-term strength of the soft rock and provide data support for engineering design and construction.
Disclosure of Invention
One of the purposes of the invention is to provide a simulation experiment device and method for soft rock loading and unloading plastic creep, which are used for testing the plastic creep of the soft rock and are convenient for determining the long-term strength of the soft rock according to the plastic creep of the soft rock in actual engineering.
The embodiment of the invention provides a plastic creep simulation experiment device for loading and unloading soft rock, which comprises:
the sample clamp is used for clamping a pre-manufactured soft rock sample and detecting axial pressure, radial pressure, and generated axial strain and radial strain of the sample during a plastic creep simulation experiment;
the pressurizing machine table is used for applying axial pressure to the sample clamped by the sample clamp;
and the control terminal is respectively electrically connected with the pressurizing machine table and the sample clamp, is used for acquiring the axial pressure, the radial pressure, the axial strain and the radial strain detected by the sample clamp, and is also used for sending a starting or stopping instruction to the pressurizing machine table according to the axial pressure, the radial pressure, the axial strain and the radial strain.
Preferably, the sample holder comprises:
the lower end surface of the annular body is provided with a plurality of limiting bodies; a holding space for a pre-manufactured sample of the soft rock is formed among the plurality of limiting bodies;
the pressurizing body is sleeved in the annular body and can slide relative to the annular body;
the displacement sensor is fixedly arranged on the outer side of the annular body and used for detecting the displacement of the pressurizing body relative to the annular body in a plastic creep simulation experiment;
the annular extensometer is fixedly connected with the limiting body and used for detecting the radial strain of the sample in the plastic creep simulation experiment;
the first pressure sensor is fixedly arranged at one end of the pressurizing body, which is contacted with the sample, and is used for detecting the axial pressure of the pressurizing body on the sample;
the second pressure sensor is arranged on one side, close to the sample, of the limiting body and used for detecting the radial pressure of the sample;
and the displacement sensor, the annular extensometer, the first pressure sensor and the second pressure sensor are respectively electrically connected with the control terminal.
Preferably, the diameter of the end of the pressurizing body in contact with the sample is the same as the diameter of the sample.
Preferably, the pressurizing machine platform is an oil pressure device;
preferably, the pressurizing machine comprises:
the middle part of the working platform is provided with a cylindrical bulge; a plurality of cylindrical holes are formed around the cylindrical protrusion;
the pressurizing platform is arranged above the working platform; a plurality of cylinders are arranged on the pressurizing platform corresponding to the positions of the plurality of cylindrical holes; the cylinders correspond to the cylinder holes one by one; the cylindrical hole is matched with the size of the cylinder.
Preferably, the control terminal includes:
the pressure detection module is respectively connected with the first pressure sensor and the second pressure sensor and is used for acquiring the axial pressure detected by the first pressure sensor and acquiring the radial pressure detected by the second pressure sensor;
the axial strain detection module is connected with the displacement sensor and used for determining the axial strain of the sample according to the displacement detected by the displacement sensor;
the radial strain detection module is connected with the annular extensometer; and the radial strain of the sample is determined by the peripheral strain of the sample detected by the annular extensometer.
The invention also provides an experimental method for the soft rock loading and unloading plastic creep simulation experimental device, which comprises the following steps:
step 1: firstly, carrying out sound wave detection on a pre-manufactured sample of the soft rock by adopting an intelligent sound wave detector, and screening out a sample with a large wave speed dispersion type;
step 2: placing a sample in the accommodating space clamped by the sample, and placing the sample clamp on the cylindrical bulge of the working platform; aligning the sample centerline with the central axis of the pressurizing platform;
and step 3: after the sample is placed, the pressurizing platform is controlled to descend by the pressurizing machine until preset axial pressure is applied to the sample, so that the pressurizing platform, the pressurizing body and the sample are tightly attached; then, gradually increasing the axial pressure of the pressurizing and flattening platform on the sample at a first speed until the radial pressure value reaches a preset radial pressure value;
and 4, step 4: after the axial pressure of the pressurizing platform on the sample is constant, the axial pressure of the pressurizing platform on the sample is continuously and gradually increased at a second speed, and when the axial pressure reaches a first preset pressure value, the axial strain and the radial strain at the moment are recorded;
and 5: when the axial strain and the radial strain are basically kept unchanged, increasing the axial pressure for the next time, and recording the axial strain and the radial strain at the moment when the axial pressure reaches a second preset pressure value;
step 6: repeating the step 5, and sequentially loading according to the preset value of the axial pressure until the rock sample is subjected to creep damage;
and 7: in the test process, the control terminal collects and stores axial pressure, radial pressure, axial strain and radial strain at preset data collection intervals, and generates curves of the axial pressure, the radial pressure, the axial strain and the radial strain changing along with time;
and 8: after the test was completed, the sample was removed and its destruction characteristics were described.
Preferably, the preset axial pressure is 2 KN.
Preferably, the first rate is 0.05 MPa/s.
Preferably, the second rate is 0.2 MPa/s.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an experimental apparatus for soft rock loading and unloading plastic creep simulation according to an embodiment of the present invention;
FIG. 2 is a schematic view of a sample holder according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of FIG. 2;
FIG. 4 is a top view of a work platform and a bottom view of a compression platform in accordance with an embodiment of the present invention;
FIG. 5 is a left side view of FIG. 4;
fig. 6 is a schematic diagram of a control terminal according to an embodiment of the present invention.
In the figure:
1. a sample holder; 2. a pressurizing machine platform; 3. a control terminal; 10. an annular body; 11. a first pressure sensor; 12. a second pressure sensor; 13. a displacement sensor; 14. a circumferential extensometer; 15. a limiting body; 16. a pressure body; 17. an auxiliary body; 21. a working platform; 211. a cylindrical bore; 212. a cylindrical protrusion; 22. a pressurizing platform; 221. a cylinder; 31. a pressure detection module; 32. an axial strain detection module; 33. and a radial strain detection module.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The embodiment of the invention provides a simulation experiment device for soft rock loading and unloading plastic creep, as shown in fig. 1, comprising:
the sample clamp 1 is used for clamping a pre-manufactured soft rock sample and detecting axial pressure, radial pressure, and generated axial strain and radial strain of the sample during a plastic creep simulation experiment;
the pressurizing machine table 2 is used for applying axial pressure to the sample clamped by the sample clamp 1;
and the control terminal 3 is electrically connected with the pressurizing machine table 2 and the sample clamp 1 respectively, is used for acquiring the axial pressure, the radial pressure, the axial strain and the radial strain detected by the sample clamp 1, and is further used for sending an opening or stopping instruction to the pressurizing machine table 2 according to the axial pressure, the radial pressure, the axial strain and the radial strain.
The working principle and the beneficial effects of the technical scheme are as follows:
samples of soft rock were made in advance [ for example: the sample was prepared in a cylindrical shape, and the sample was held by a sample holder 1. And then placing the sample clamp 1 on a pressurizing machine table 2, and applying axial pressure to the sample axially by using the pressurizing machine table 2 to perform a plastic creep simulation experiment. The control terminal controls parameters such as starting, stopping and pressurizing speed of the pressurizing machine table 2 in the experiment process according to the axial pressure, the radial pressure, the axial strain and the radial strain detected by the obtained sample clamp by the control terminal 3. In addition, the control terminal 3 also detects the axial pressure, the radial pressure, the axial strain of the sample and the radial strain of the sample to which the sample is subjected through the sample clamp 1 during the experiment. The axial pressure is the force applied to the two circular surfaces of the cylinder; radial pressure is the force that is generated when the cylinder extends in the circumferential direction when subjected to axial pressure.
The experimental device for simulating the loading and unloading plastic creep of the soft rock is used for testing the plastic creep of the soft rock, and the long-term strength of the soft rock can be conveniently determined according to the plastic creep of the soft rock in actual engineering.
In order to clamp a sample of soft rock prepared in advance and detect the pressure, the generated axial strain and the radial strain to which the sample is subjected during a plastic creep simulation experiment, as shown in fig. 2 and 3, in one embodiment, the sample clamp 1 comprises:
the lower end face of the annular body 10 is provided with a plurality of limiting bodies 15; a holding space for a sample of soft rock prepared in advance is formed between the plurality of stoppers 15;
the pressurizing body 16 is sleeved in the annular body 10, and the pressurizing body 16 can slide relative to the annular body 10;
a displacement sensor 13 fixedly provided outside the annular body 10 for detecting a displacement of the pressure body 16 relative to the annular body 10 at the time of a plastic creep simulation experiment;
the annular extensometer 14 is fixedly connected with the limiting body 15 and is used for detecting the radial strain of the sample in the plastic creep simulation experiment;
the first pressure sensor 11 is fixedly arranged at one end of the pressurizing body 16, which is contacted with the sample, and is used for detecting the axial pressure of the pressurizing body 16 on the sample;
the second pressure sensor 12 is arranged on one side of the limiting body 15 close to the sample and used for detecting the radial pressure of the sample;
the displacement sensor 13, the annular extensometer 14, the first pressure sensor 11 and the second pressure sensor 12 are respectively electrically connected with the control terminal 3.
The working principle and the beneficial effects of the technical scheme are as follows:
the sample is put into the containing space, and one end of the sample is contacted with the pressurizing body 16; the sample holder 1 is placed on the work platform 21 of the press bench 2. The pressurizing machine 2 applies an axial pressure to the sample through the pressurizing body 16. Detecting the axial pressure exerted by the sample by means of the first pressure sensor 11; the hoop extensometer 14 detects the radial strain of the sample; the displacement sensor 13 detects the axial strain of the sample; the second pressure sensor detects radial pressure generated in the radial direction after the sample is subjected to the axial pressure; therefore, the sample clamp 1 can clamp a pre-manufactured soft rock sample and detect the axial pressure, the radial pressure, the generated axial strain and the radial strain of the sample in a plastic creep simulation experiment. The displacement sensor 13 is used in conjunction with the auxiliary body 17. The auxiliary body 17 is annular and is fixedly sleeved on the periphery of the pressurizing body 16; the pressurizing body 16 is provided with a hole for allowing the displacement sensor 13 to pass through, and the displacement sensor 13 detects the displacement of the auxiliary body 17 to determine the displacement of the pressurizing body 16, so as to determine the axial strain of the sample.
In one embodiment, the end of the pressure body 16 that contacts the sample has the same diameter as the diameter of the sample.
The working principle and the beneficial effects of the technical scheme are as follows:
in order to apply axial pressure to the sample by the pressurizing machine 2 conveniently, the data of the plastic creep simulation experiment of the sample is ensured to be accurate.
In order to ensure the stability of the pressure applied to the sample; in one embodiment, the pressurizing machine 2 is an oil pressure device;
in one embodiment, as shown in fig. 4 and 5, the pressing machine 2 includes:
the middle part of the working platform 21 is provided with a cylindrical bulge 212; a plurality of cylindrical holes 211 are provided around the cylindrical protrusion 212;
a pressurizing platform 22 disposed above the working platform 21; the pressurizing platform 22 is provided with a plurality of cylinders 221 corresponding to the positions of the plurality of cylindrical holes 211; the cylinders 221 correspond to the cylinder holes 211 one to one; the cylindrical bore 211 is sized to accommodate the cylindrical body 221.
The working principle and the beneficial effects of the technical scheme are as follows:
the pressurizing platform 22 is a pressure output member connected to a power output member (for example, a hydraulic cylinder) of the pressurizing machine 2, and the work platform 21 is a fixed member. During the experiment, the pressurizing platform 22 moves downwards to apply axial pressure to the sample clamp 1 on the working platform 21. The cylinder 221 and the cylinder hole 211 are matched to ensure that the axial pressure applied to the sample by the pressurizing platform 22 does not deviate, and specifically, the cylinder 221 enters the cylinder to control the plane position of the pressurizing platform 22 to be limited along with the descending of the pressurizing platform 22 in the experimental process. The placement of the sample holder 1 on the cylindrical protrusion 212 ensures that the axis of the sample in the sample holder 1 coincides with the axis of the pressing platform 22, and is also designed to ensure that the axial pressure applied to the sample by the pressing platform 22 does not shift.
In order to achieve the pressure, axial strain and radial strain detected by the specimen collecting jig 1, in one embodiment, as shown in fig. 6, the control terminal 3 includes:
the pressure detection module 31 is respectively connected with the first pressure sensor 11 and the second pressure sensor 12, and is configured to acquire an axial pressure detected by the first pressure sensor 11 and acquire a radial pressure detected by the second pressure sensor 12;
the axial strain detection module 32 is connected with the displacement sensor 13 and used for determining the axial strain of the sample according to the displacement detected by the displacement sensor 13;
a radial strain detection module 33 connected to the hoop extensometer 14; for obtaining the radial strain of the sample detected by the hoop extensometer 14.
In addition, the control terminal 3 further comprises a processor and a communication module; the processor is respectively connected with the pressure detection module 31, the axial strain detection module 32, the radial strain detection module 33 and the communication module; the communication module is connected with the control box of the pressurizing machine table 2. The processor is used for controlling the pressurizing machine table 2 according to the radial pressure and the preset axial pressure of a preset sample set by a user; the control mainly includes changing the pressure raising rate, opening and closing of the pressurizing machine 2.
The invention also provides an experimental method for the soft rock loading and unloading plastic creep simulation experimental device, which comprises the following steps:
step 1: firstly, carrying out sound wave detection on a pre-manufactured sample of the soft rock by adopting an intelligent sound wave detector, and screening out a sample with a large wave speed dispersion type;
step 2: placing the sample in the sample clamping accommodation space, and placing the sample clamp 1 on the cylindrical protrusion 212 of the working platform 21; the center line of the sample is aligned with the central axis of the pressurizing platform 22, so that the influence of eccentric pressure on the test result is prevented;
and step 3: after the sample is placed, the pressurizing platform 22 is controlled to descend by the pressurizing machine 2 until a preset axial pressure is applied to the sample, so that the pressurizing platform 22, the pressurizing body 16 and the sample are tightly attached; then gradually increasing the axial pressure of the pressurizing platform 22 on the sample at a first rate until the radial pressure reaches a preset radial pressure value;
and 4, step 4: after the axial pressure of the pressurizing platform 22 on the sample is constant, continuously and gradually increasing the axial pressure of the pressurizing platform 22 on the sample at a second speed, and recording the axial strain and the radial strain when the pressure reaches a first preset pressure value;
and 5: when the axial strain and the radial strain are basically kept unchanged, increasing the axial pressure for the next time, and recording the axial strain and the radial strain at the moment when the axial pressure reaches a second preset pressure value;
step 6: repeating the step 5, and sequentially loading according to the preset value of the axial pressure until the rock sample is subjected to creep damage;
and 7: in the test process, the control terminal 3 collects and stores axial pressure, radial pressure, axial strain and radial strain at preset data collection intervals, and generates curves of the axial pressure, the radial pressure, the axial strain and the radial strain changing along with time;
and 8: after the test was completed, the sample was removed and its destruction characteristics were described.
The working principle and the beneficial effects of the technical scheme are as follows:
the sample is screened by the intelligent sound wave detector, so that the adverse effect of the defects of the sample on the test result is avoided. The creep test of the sample is completed through the steps 1 to 8, so that a user can conveniently determine the long-term strength of the soft rock according to the plastic creep of the soft rock.
In one embodiment, the preset axial pressure is 2 KN.
In one embodiment, the first rate is 0.05 MPa/s.
In one embodiment, the second rate is 0.2 MPa/s.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (7)

1. The utility model provides a be used for soft rock loading and unloading plastic creep simulation experiment device which characterized in that includes:
the sample clamp (1) is used for clamping a pre-manufactured soft rock sample and detecting axial pressure, radial pressure, and generated axial strain and radial strain of the sample during a plastic creep simulation experiment;
a pressurizing machine table (2) for applying the axial pressure to the sample clamped by the sample clamp (1);
the control terminal (3) is electrically connected with the pressurizing machine table (2) and the sample clamp (1) respectively, is used for acquiring the axial pressure, the radial pressure, the axial strain and the radial strain detected by the sample clamp (1), and is further used for sending a starting or stopping instruction to the pressurizing machine table (2) according to the axial pressure, the radial pressure, the axial strain and the radial strain;
the sample holder (1) comprises:
the device comprises an annular body (10), wherein a plurality of limiting bodies (15) are arranged on the lower end face of the annular body (10); a holding space for a sample of soft rock manufactured in advance is formed among the plurality of limiting bodies (15);
the pressurizing body (16) is sleeved in the annular body (10), and the pressurizing body (16) can slide relative to the annular body (10);
a displacement sensor (13) fixedly arranged outside the annular body (10) and used for detecting the displacement of the pressure body (16) relative to the annular body (10) in a plastic creep simulation experiment;
the annular extensometer (14) is fixedly connected with the limiting body (15) and is used for detecting the radial strain of a sample in a plastic creep simulation experiment;
a first pressure sensor (11) fixedly arranged at one end of the pressurizing body (16) contacting with the sample and used for detecting the axial pressure of the pressurizing body (16) to the sample;
the second pressure sensor (12) is arranged on one side, close to the sample, of the limiting body (15) and used for detecting the radial pressure of the sample;
the displacement sensor (13), the annular extensometer (14), the first pressure sensor (11) and the second pressure sensor (12) are respectively and electrically connected with the control terminal (3);
the pressurizing machine (2) comprises:
the device comprises a working platform (21), wherein a cylindrical bulge (212) is arranged in the middle of the working platform (21); a plurality of cylindrical holes (211) are arranged around the cylindrical protrusion (212);
a pressing platform (22) arranged above the working platform (21); a plurality of cylinders (221) are arranged on the pressurizing platform (22) corresponding to the positions of the plurality of cylindrical holes (211); the cylinders (221) correspond to the cylinder holes (211) one by one; the cylindrical hole (211) is adaptive to the size of the cylinder (221);
the control terminal (3) comprises:
the pressure detection module (31) is respectively connected with the first pressure sensor (11) and the second pressure sensor (12) and is used for acquiring the axial pressure detected by the first pressure sensor (11) and acquiring the radial pressure detected by the second pressure sensor (12);
an axial strain detection module (32) connected to the displacement sensor (13) for determining the axial strain of the sample from the displacement detected by the displacement sensor (13);
a radial strain detection module (33) connected to the hoop extensometer (14); for obtaining the radial strain of the sample detected by the hoop extensometer (14).
2. The experimental apparatus for soft rock loading and unloading plastic creep simulation as claimed in claim 1, wherein the end of the pressurizing body (16) contacting the sample has the same diameter as the sample.
3. The experimental device for soft rock loading and unloading plastic creep simulation as claimed in claim 1, wherein the pressurizing machine (2) is an oil pressure device.
4. An experimental method using the experimental apparatus for soft rock loading and unloading plastic creep simulation as claimed in any one of claims 1 to 3, comprising:
step 1: firstly, carrying out sound wave detection on a pre-manufactured sample of the soft rock by adopting an intelligent sound wave detector, and screening out a sample with a large wave speed dispersion type;
step 2: placing the sample in the receiving space clamped by the sample, and placing a sample clamp (1) on a cylindrical protrusion (212) of the working platform (21); aligning the sample centerline with a central axis of the pressurization platform (22);
and step 3: after the sample is placed, the pressurizing machine table (2) controls the pressurizing platform (22) to descend until preset axial pressure is applied to the sample, so that the pressurizing platform (22), the pressurizing body (16) and the sample are tightly attached; then gradually increasing the axial pressure of the pressurizing platform (22) on the sample at a first rate until the radial pressure reaches a preset radial pressure value;
and 4, step 4: after the axial pressure of the pressurizing platform (22) on the sample is constant, continuing to gradually increase the axial pressure of the pressurizing platform (22) on the sample at a second speed, and recording the axial strain and the radial strain at the moment when the pressure reaches a first preset pressure value;
and 5: when the axial strain and the radial strain are basically kept unchanged, increasing the axial pressure for the next time, and recording the axial strain and the radial strain at the moment when the axial pressure reaches a second preset pressure value;
step 6: repeating the step 5, and sequentially loading according to the preset value of the axial pressure until the rock sample is subjected to creep damage;
and 7: in the test process, a control terminal (3) collects and stores the axial pressure, the radial pressure, the axial strain and the radial strain at preset data collection intervals, and generates curves of the axial pressure, the radial pressure, the axial strain and the radial strain along with time change;
and 8: after the test was completed, the sample was removed and its destruction characteristics were described.
5. The experimental apparatus for soft rock loading and unloading plastic creep simulation of claim 4, wherein the predetermined axial pressure is 2 KN.
6. The experimental apparatus for soft rock loading and unloading plastic creep simulation of claim 4, wherein the first rate is 0.05 MPa/s.
7. The apparatus for soft rock loading and unloading plastic creep simulation experiments according to claim 4, wherein the second rate is 0.2 MPa/s.
CN202010297194.1A 2020-04-15 2020-04-15 Experimental device and method for soft rock loading and unloading plastic creep simulation Active CN111323310B (en)

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CN202010297194.1A CN111323310B (en) 2020-04-15 2020-04-15 Experimental device and method for soft rock loading and unloading plastic creep simulation

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Application Number Priority Date Filing Date Title
CN202010297194.1A CN111323310B (en) 2020-04-15 2020-04-15 Experimental device and method for soft rock loading and unloading plastic creep simulation

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