CN110836953A - Method and device for testing partitioned energy storage characteristics of coal-rock combination - Google Patents

Method and device for testing partitioned energy storage characteristics of coal-rock combination Download PDF

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Publication number
CN110836953A
CN110836953A CN201910968592.9A CN201910968592A CN110836953A CN 110836953 A CN110836953 A CN 110836953A CN 201910968592 A CN201910968592 A CN 201910968592A CN 110836953 A CN110836953 A CN 110836953A
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China
Prior art keywords
coal
rock
energy density
level
load
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Inventor
杨磊
高富强
杨景贺
王晓卿
娄金福
李建忠
曹舒雯
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Tiandi Science and Technology Co Ltd
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Tiandi Science and Technology Co Ltd
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Priority to CN201910968592.9A priority Critical patent/CN110836953A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0019Compressive
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/0202Control of the test
    • G01N2203/0212Theories, calculations
    • G01N2203/0218Calculations based on experimental data
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/06Indicating or recording means; Sensing means
    • G01N2203/067Parameter measured for estimating the property
    • G01N2203/0676Force, weight, load, energy, speed or acceleration

Abstract

The embodiment of the invention provides a method and a device for testing the partitioned energy storage characteristics of a coal-rock combination. The method comprises the following steps: obtaining the average uniaxial compressive strength of a plurality of coal rock combined test pieces in a uniaxial compression test; acquiring stress strain data of coal and rock under each level of load in a single-shaft multi-level cyclic loading and unloading test of the coal and rock combined test piece; acquiring input energy density, elastic energy density and dissipated energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level; and acquiring the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level. The method and the device can accurately test the partitioned energy storage characteristics of the coal rock.

Description

Method and device for testing partitioned energy storage characteristics of coal-rock combination
Technical Field
The invention relates to the technical field of coal mining, in particular to a method and a device for testing the partitioned energy storage characteristics of a coal-rock combination.
Background
With the increase of the coal mining depth, engineering disasters such as roadway deformation instability, roof fall, rock burst and the like of underground mining engineering frequently occur. Disasters in the process of coal mine deep mining are not only influenced by fracture structural planes of coal and rock, but also influenced by combined action of a coal body-rock body combined structure (hereinafter referred to as a coal-rock combined body).
However, coal and rock are two different media, which have great differences in strength, material quality, non-uniformity, microscopic structure and the like, and there may be a certain one-sidedness in studying the failure mechanism of the coal-rock composite by using mechanical properties such as strength, stress-strain and the like.
In fact, the destruction of substances is a state instability phenomenon driven by energy, and the research on coal rock destruction mechanism from the energy perspective is closer to the essence of the coal rock destruction mechanism. However, the coal and rock media are different, the parameters such as strength and deformation are also different, and the energy storage limit and the energy evolution characteristic are obviously different.
Therefore, if the partitioned energy storage characteristics of the coal rock can be accurately tested, the method can help to reveal an energy driving mechanism of coal rock deformation damage and establish an energy criterion of impact damage, and has important theoretical significance on the energy mechanism and prediction of the rock burst.
Disclosure of Invention
In view of the defects in the prior art, in one aspect, an embodiment of the present invention provides a method for testing energy storage characteristics of coal-rock assemblies in different zones, including:
obtaining the average uniaxial compressive strength of a plurality of coal rock combined test pieces in a uniaxial compression test;
acquiring stress strain data of the coal and rock under each level of load in a single-shaft multi-level cyclic loading and unloading test of the coal and rock combined test piece;
acquiring input energy density, elastic energy density and dissipated energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level;
acquiring the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level;
wherein, the single-shaft multistage circulation loading and unloading test comprises the following steps:
and after applying a load to the coal rock combined test piece to 80-100% of the average uniaxial compressive strength, applying a load to the coal rock combined test piece until the coal rock combined test piece is damaged.
In one embodiment, in the single-shaft multi-stage cyclic loading and unloading test:
the difference value of the loads of two adjacent stages is 5KN, the speed of applying and unloading the loads is 1KN/s, and the minimum value of the applied loads during unloading is 1KN-3 KN.
In one embodiment, the uniaxial compression test comprises:
gradually applying load to the coal-rock combined test piece until the coal-rock combined test piece is damaged;
wherein the rate of load application is 1 KN/s.
In one embodiment, the obtaining the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load according to the stress-strain data of the coal and the rock at each level of load comprises:
acquiring stress-strain curves of the coal and the rock at all levels of load levels according to the stress-strain data of the coal and the rock at all levels of load levels;
and acquiring the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level according to the stress-strain curve of the coal and the rock at each level of load level.
In one embodiment, said obtaining the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level comprises:
obtaining an energy evolution equation through fitting analysis according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level;
and acquiring the peak input energy density, the peak elastic energy density and the peak dissipation energy density of the coal and the rock according to the energy evolution equation and the peak strength of the coal and rock combined test piece in the single-shaft multistage cyclic loading and unloading test.
On the other hand, the embodiment of the invention also provides a device for testing the energy storage characteristics of the coal-rock combination areas, which comprises:
the first acquisition module is used for acquiring the average uniaxial compressive strength of a plurality of coal and rock combined test pieces in a uniaxial compression test;
the second acquisition module is used for acquiring stress-strain data of the coal and rock under each level of load in a single-shaft multi-level cyclic loading and unloading test of the coal and rock combined test piece;
the first calculation module is used for acquiring the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level;
the second calculation module is used for acquiring the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level;
wherein, the single-shaft multistage circulation loading and unloading test comprises the following steps:
and after applying a load to the coal rock combined test piece to 80-100% of the average uniaxial compressive strength, applying a load to the coal rock combined test piece until the coal rock combined test piece is damaged.
In one embodiment, in the single-shaft multi-stage cyclic loading and unloading test:
the difference value of the loads of two adjacent stages is 5KN, the speed of applying and unloading the loads is 1KN/s, and the minimum value of the applied loads during unloading is 1KN-3 KN.
In one embodiment, the uniaxial compression test comprises:
gradually applying load to the coal-rock combined test piece until the coal-rock combined test piece is damaged;
wherein the rate of load application is 1 KN/s.
On the other hand, the embodiment of the invention also provides a device for testing the energy storage characteristics of the coal-rock combination areas, which comprises:
the upper pressure head is matched with the lower pressure head and used for pressing the coal rock combined test piece;
the upper fixing ring is fixed on the upper pressure head and is vertical to the central shaft of the upper pressure head;
the lower fixing ring is fixed on the lower pressure head and is vertical to the central shaft of the lower pressure head;
the middle fixing ring is fixed at the junction of coal and rock in the coal and rock combined test piece and is parallel to the upper fixing ring and the lower fixing ring;
the upper displacement sensor is vertically arranged between the upper fixing ring and the middle fixing ring;
the lower displacement sensor is vertically arranged between the lower fixing ring and the middle fixing ring;
the upper annular extensometer is parallel to the upper pressure head and is arranged at the upper part of the coal rock combined test piece;
and the lower annular extensometer is parallel to the lower pressure head and is arranged at the lower part of the coal rock combined test piece.
On the other hand, an embodiment of the present invention further provides an electronic device, including: at least one processor, at least one memory, a communication interface, and a bus; wherein the content of the first and second substances,
the processor, the memory and the communication interface complete mutual communication through the bus; the memory stores program instructions executable by the processor; the processor calls the program instructions to perform any of the methods described above.
According to the method and the device for testing the coal-rock combination regional energy storage characteristics, the average uniaxial compressive strength is obtained, and a uniaxial multi-stage cyclic loading and unloading test is carried out on the coal-rock combination test piece based on the average uniaxial compressive strength, so that the peak input energy density, the peak elastic energy density and the peak dissipation energy density of coal and rock are obtained, the regional energy storage characteristics of the coal and rock can be accurately tested, an energy driving mechanism for deformation and damage of the coal and rock is disclosed, an energy criterion for impact damage of the coal and rock is established, and the method and the device have important theoretical significance for energy mechanism and prediction of the impact ground pressure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for testing the energy storage characteristics of a coal-rock combination region according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a coal rock composite test piece according to an embodiment of the invention;
FIG. 3 is a graph of stress-strain curves at various levels of loading for coal and rock according to an embodiment of the present invention;
FIG. 4 is a schematic view of a cycle curve of FIG. 3;
FIG. 5 is a schematic illustration of input energy density, elastic energy density, and dissipated energy density of coal and rock according to an embodiment of the invention;
FIG. 6 is a schematic structural diagram of an apparatus for testing energy storage characteristics of coal-rock combinations according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an apparatus for testing the partitioned energy storage characteristics of a coal-rock combination according to an embodiment of the invention;
fig. 8 is a schematic physical structure diagram of an electronic device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a method for testing the partitioned energy storage characteristics of a coal-rock combination according to an embodiment of the invention, and referring to fig. 1, the method includes:
s1, obtaining the average uniaxial compressive strength of a plurality of coal rock combined test pieces in a uniaxial compression test;
it should be noted that the execution main body of the method for testing the partitioned energy storage characteristics of the coal-rock combination provided by the embodiment of the present invention may be a computer, for example, a PC, a desktop, a notebook, a pad, an embedded computer, and the like.
In one embodiment, the coal-rock combined test piece is formed by connecting a single coal test piece and a rock test piece in series through natural superposition, as shown in fig. 2. The specifications of the coal test piece and the rock test piece are both phi 50 multiplied by 50mm, and the specification of the coal-rock combined test piece is phi 50 multiplied by 100 mm. The coal rock combined test piece can be in the shape of a cylinder, a cuboid with two square end faces and the like.
Specifically, the uniaxial compression test comprises:
and gradually applying load to the coal-rock combined test piece until the coal-rock combined test piece is damaged.
In one embodiment, the rate of the load applied by the uniaxial compression test is 1KN/s, three coal rock combined test pieces are used, and finally the average uniaxial compression strength is obtained by calculating the average value of the uniaxial compression strengths of the three coal rock combined test pieces.
S2, acquiring stress strain data of the coal and rock under each level of load in a single-shaft multi-level cyclic loading and unloading test of the coal and rock combined test piece;
specifically, the uniaxial multistage cyclic loading and unloading test comprises the following steps:
and after applying a load to the coal rock combined test piece to 80-100% of the average uniaxial compressive strength, applying a load to the coal rock combined test piece until the coal rock combined test piece is damaged.
The difference of the maximum value of the applied load of the pressure loading test of the two adjacent stages is 5KN (namely the difference of the loads of the two adjacent stages is 5KN), the speed of applying and unloading the load is 1KN/s, and the minimum value of the applied load during unloading is 1KN-3 KN.
In the single-shaft multistage cyclic loading and unloading test, the coal rock combined test piece can be subjected to single-shaft pressure application at the minimum load, such as 1KN, then the load is gradually increased to 5KN at the loading rate of 1KN/s, then the load is returned to 1KN (i.e. unloaded), then the load is gradually increased to 10KN at the loading rate of 1KN/s, and the like (i.e. 5KN is taken as a cycle) until the load applied to the coal rock combined test piece reaches 80% -100% of the average single-shaft compressive strength. Finally, the load is returned to 1KN and gradually increased until the coal rock combined test piece is damaged.
S3, acquiring input energy density, elastic energy density and dissipation energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level;
specifically, step S3 specifically includes:
acquiring stress-strain curves of the coal and the rock at all levels of load levels according to the stress-strain data of the coal and the rock at all levels of load levels;
and acquiring the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level according to the stress-strain curve of the coal and the rock at each level of load level.
It should be noted that, in the process of applying a load to the coal rock composite test piece, the input of energy mainly comes from the work of the applied load on the coal rock composite test piece, regardless of damping consumption and heat exchange.
One part of input energy is accumulated in the coal rock combined test piece in the form of elastic deformation energy and is reversible and can be released during unloading, and the other part of input energy is dissipated in the form of plastic deformation energy, damage energy and the like and is irreversible, namely:
U=Ue+Up(1)
wherein: u being the energy input, UeFor releasing elastic energy, UpTo dissipate energy.
Because the coal and the rock are in a series relation and the forces borne by the coal and the rock are applied loads, strain data of the coal and the rock at each level of load level can be obtained respectively, and stress-strain curves of the coal and the rock at each level of load level can be further obtained, as shown in fig. 3. One of the cyclic curves is extracted for analysis, as shown in fig. 4, the area under the load curve OAC is the work done by the load, i.e. the input energy U, and the area under the unload curve ABC is the releasable elastic energy UeThe total load work minus the elastic deformation energy of the test piece is the dissipated energy UpI.e. the area between the loading and unloading curves OAB. The calculation method is shown in formula 2.
And S4, acquiring the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level.
In one embodiment, step S4 specifically includes:
according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level, synchronously obtaining respective energy evolution equations of the coal and the rock through fitting analysis;
and according to the energy evolution equation, combining the peak intensity of the coal and rock combined test piece in the single-shaft multistage cyclic loading and unloading test, and respectively obtaining the peak input energy density, the peak elastic energy density and the peak dissipation energy density of the coal and the rock.
Specifically, according to formula 2, a graph integration method is adopted, as shown in fig. 5, the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level can be obtained, an energy evolution equation can be obtained through fitting analysis, and then the peak intensity of the coal and rock combined test piece is brought into the energy evolution equation, so that the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock can be obtained through calculation.
In one embodiment, the obtained evolution equations are respectively:
U=9E-05σ2+0.0004σ+0.0003
Ue=8E-05σ2+0.0005σ-0.0011
Up=1E-05σ2-0.0001σ+0.0013
it can be understood that the peak strength of the coal rock composite test piece is determined according to the average uniaxial compressive strength of the load applied to the coal rock composite test piece in the uniaxial multistage cyclic loading and unloading test.
According to the method for testing the coal-rock combination regional energy storage characteristics, the average uniaxial compressive strength is obtained, and the uniaxial multistage cyclic loading and unloading test is carried out on the coal-rock combination test piece based on the average uniaxial compressive strength, so that the peak input energy density, the peak elastic energy density and the peak dissipation energy density of coal and rock are obtained, the regional energy storage characteristics of the coal and rock can be accurately tested, the energy driving mechanism of coal rock deformation damage can be disclosed, the energy criterion of impact damage can be established, and the method has important theoretical significance on the energy mechanism and prediction of the impact ground pressure.
On the other hand, an embodiment of the present invention further provides a device for testing energy storage characteristics of a coal-rock combination, as shown in fig. 6, the device includes a first obtaining module 1, a second obtaining module 2, a first calculating module 3, and a second calculating module 4.
The first acquisition module 1 is used for acquiring the average uniaxial compressive strength of a plurality of coal rock combined test pieces in a uniaxial compression test;
the second acquisition module 2 is used for acquiring stress-strain data of the coal and rock under each level of load in a single-shaft multi-level cyclic loading and unloading test of the coal and rock combined test piece;
the first calculation module 3 is used for acquiring the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level;
and the second calculation module 4 is used for acquiring the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level.
In one embodiment, the coal-rock combined test piece is formed by connecting a single coal test piece and a rock test piece in series through natural superposition, as shown in fig. 2. The specifications of the coal test piece and the rock test piece are both phi 50 multiplied by 50mm, and the specification of the coal-rock combined test piece is phi 50 multiplied by 100 mm. The coal rock combined test piece can be in the shape of a cylinder, a cuboid with two square end faces and the like.
Specifically, the uniaxial compression test comprises:
and gradually applying load to the coal-rock combined test piece until the coal-rock combined test piece is damaged.
In one embodiment, the rate of the load applied by the uniaxial compression test is 1KN/s, three coal rock combined test pieces are used, and finally the average uniaxial compression strength is obtained by calculating the average value of the uniaxial compression strengths of the three coal rock combined test pieces.
Specifically, the uniaxial multistage cyclic loading and unloading test comprises the following steps:
and after applying a load to the coal rock combined test piece to 80-100% of the average uniaxial compressive strength, applying a load to the coal rock combined test piece until the coal rock combined test piece is damaged.
The difference of the maximum value of the applied load of the pressure loading test of the two adjacent stages is 5KN (namely the difference of the loads of the two adjacent stages is 5KN), the speed of applying and unloading the load is 1KN/s, and the minimum value of the applied load during unloading is 1KN-3 KN.
In the single-shaft multistage cyclic loading and unloading test, the coal rock combined test piece can be subjected to single-shaft pressure application at the minimum load, such as 1KN, then the load is gradually increased to 5KN at the loading rate of 1KN/s, then the load is returned to 1KN, then the load is gradually increased to 10KN at the loading rate of 1KN/s, and the like (namely, 5KN is taken as a cycle) until the load applied to the coal rock combined test piece reaches 80% -100% of the average single-shaft compressive strength. Finally, the load is returned to 1KN and gradually increased until the coal rock combined test piece is damaged.
Specifically, the first calculation module is specifically configured to:
acquiring stress-strain curves of the coal and the rock at all levels of load levels according to the stress-strain data of the coal and the rock at all levels of load levels;
and acquiring the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level according to the stress-strain curve of the coal and the rock at each level of load level.
It should be noted that, in the process of applying a load to the coal rock composite test piece, the input of energy mainly comes from the work of the applied load on the coal rock composite test piece, regardless of damping consumption and heat exchange.
One part of input energy is accumulated in the coal rock combined test piece in the form of elastic deformation energy and is reversible and can be released during unloading, and the other part of input energy is dissipated in the form of plastic deformation energy, damage energy and the like and is irreversible, namely:
U=Ue+Up(1)
wherein: u being the energy input, UeFor releasing elastic energy, UpTo dissipate energy.
Because the coal and the rock are in a series relation and the forces borne by the coal and the rock are applied loads, strain data of the coal and the rock at each level of load level can be obtained respectively, and stress-strain curves of the coal and the rock at each level of load level can be further obtained, as shown in fig. 3. One of the cyclic curves is extracted for analysis, as shown in fig. 4, the area under the load curve OAC is the work done by the load, i.e. the input energy U, and the area under the unload curve ABC is the releasable elastic energy UeThe total load work minus the elastic deformation energy of the test piece is the dissipated energy UpI.e. the area between the loading and unloading curves OAB. The calculation method is shown in formula 2.
In one embodiment, the second calculating module 4 is specifically configured to:
obtaining an energy evolution equation through fitting analysis according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level;
and acquiring the peak input energy density, the peak elastic energy density and the peak dissipation energy density of the coal and the rock according to the energy evolution equation and the peak strength of the coal and rock combined test piece in the single-shaft multistage cyclic loading and unloading test.
Specifically, according to the formula 2, the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level can be obtained by adopting a graph integration method, an energy evolution equation can be obtained through fitting analysis, and the peak intensity of the coal and rock combined test piece is brought into the energy evolution equation, so that the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock can be obtained through calculation.
It can be understood that the peak strength of the coal rock composite test piece is determined according to the average uniaxial compressive strength of the load applied to the coal rock composite test piece in the uniaxial multistage cyclic loading and unloading test.
According to the device for testing the coal-rock combination regional energy storage characteristics, the average uniaxial compressive strength is obtained, and a uniaxial multistage cyclic loading and unloading test is carried out on the coal-rock combination test piece based on the average uniaxial compressive strength, so that the peak input energy density, the peak elastic energy density and the peak dissipation energy density of coal and rock are obtained, the regional energy storage characteristics of the coal and rock can be accurately tested, an energy driving mechanism for coal rock deformation and damage can be disclosed, an energy criterion for impact damage can be established, and the device has important theoretical significance on the energy mechanism and prediction of the impact ground pressure.
In another aspect, an embodiment of the present invention further provides an apparatus for testing energy storage characteristics of coal-rock combinations in different zones, as shown in fig. 7, the apparatus includes:
the coal rock test device comprises an upper pressure head 61 and a lower pressure head 62, wherein the upper pressure head 61 is matched with the lower pressure head 62 and is used for pressing the coal rock combined test piece in each embodiment;
an upper fixing ring 63 fixed on the upper ram 61 and perpendicular to the central axis of the upper ram 61;
a lower fixing ring 64 fixed on the lower press head 62 and vertical to the central axis of the lower press head 62;
the middle fixing ring 65 is fixed at the junction of coal and rock in the coal and rock combined test piece and is parallel to the upper fixing ring 63 and the lower fixing ring 64;
an upper displacement sensor 66 vertically disposed between the upper fixing ring 63 and the middle fixing ring 65;
a lower displacement sensor 67 vertically disposed between the lower fixing ring 64 and the middle fixing ring 65;
the upper annular extensometer 68 is parallel to the upper pressure head 61 and is arranged at the upper part of the coal rock combined test piece;
and a lower annular extensometer 69 which is parallel to the lower pressure head 62 and is arranged at the lower part of the coal rock combined test piece.
Specifically, when the device for testing the energy storage characteristics of the coal-rock composite block provided by the embodiment of the invention is used, the upper annular extensometer 68 and the lower annular extensometer 69 can be respectively installed in the middle of the coal test piece and the middle of the rock test piece; then, the coal and rock test pieces are naturally overlapped and placed between the upper pressure head 61 and the lower pressure head 62; an upper fixing ring 63 is fixed at the upper pressure head 61, a lower fixing ring 64 is fixed at the lower pressure head 62, and a middle fixing ring 65 is fixed at the coal-rock interface; the initial positions of the upper displacement sensor 66 and the lower displacement sensor 67 are adjusted, and the mounted device is placed on a testing machine.
The upper displacement sensor 66, the lower displacement sensor 67, the upper annular extensometer 68 and the lower annular extensometer 69 can be connected with a signal acquisition system of the testing machine, and respective stress strain data and conventional mechanical parameters of coal and rock in the coal-rock combined test piece can be synchronously obtained in the loading process of the testing machine, so that the coal-rock partitioned energy storage characteristic can be obtained by the method for testing the partitioned energy storage characteristic of the coal-rock combined body provided by the embodiment.
The device for testing the coal-rock combination partition energy storage characteristic provided by the embodiment of the invention has a simple structure and higher stability, can accurately obtain respective stress strain data of coal and rock in a coal-rock combination test piece, and has a good application prospect.
On the other hand, an embodiment of the present invention further provides an electronic device, as shown in fig. 8. The electronic device may include: a Processor (Processor)710, a Communication Interface (Communication Interface)720, a Memory (Memory)730, and a Communication Bus (Bus)740, wherein the Processor 710, the Communication Interface 720, and the Memory 730 communicate with each other via the Communication Bus 740. The processor 710 may invoke a computer program stored in the memory 730 and executable on the processor 710 to perform the method for testing the energy storage characteristics of the coal-rock combination partition provided in the foregoing embodiments, for example, the method includes:
obtaining the average uniaxial compressive strength of a plurality of coal rock combined test pieces in a uniaxial compression test;
acquiring stress strain data of the coal and rock under each level of load in a single-shaft multi-level cyclic loading and unloading test of the coal and rock combined test piece;
acquiring input energy density, elastic energy density and dissipated energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level;
and acquiring the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level.
In addition, the logic instructions in the memory 730 can be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the method for testing the partitioned energy storage characteristics of a coal-rock combination according to the embodiments described above, for example, the method includes:
obtaining the average uniaxial compressive strength of a plurality of coal rock combined test pieces in a uniaxial compression test;
acquiring stress strain data of the coal and rock under each level of load in a single-shaft multi-level cyclic loading and unloading test of the coal and rock combined test piece;
acquiring input energy density, elastic energy density and dissipated energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level;
and acquiring the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level.
The above-described embodiments are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the technical scheme of the invention. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for testing the partitioned energy storage characteristics of a coal-rock combination body is characterized by comprising the following steps:
obtaining the average uniaxial compressive strength of a plurality of coal rock combined test pieces in a uniaxial compression test;
acquiring stress strain data of the coal and rock under each level of load in a single-shaft multi-level cyclic loading and unloading test of the coal and rock combined test piece;
acquiring input energy density, elastic energy density and dissipated energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level;
acquiring the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level;
wherein, the single-shaft multistage circulation loading and unloading test comprises the following steps:
and after applying a load to the coal rock combined test piece to 80-100% of the average uniaxial compressive strength, applying a load to the coal rock combined test piece until the coal rock combined test piece is damaged.
2. The method for testing the partitioned energy storage characteristics of the coal-rock combination according to claim 1, wherein in the uniaxial multistage cyclic loading and unloading test:
the difference value of the loads of two adjacent stages is 5KN, the speed of applying and unloading the loads is 1KN/s, and the minimum value of the applied loads during unloading is 1KN-3 KN.
3. The method for testing the partitioned energy storage characteristics of the coal-rock combination according to claim 1, wherein the uniaxial compression test comprises:
gradually applying load to the coal-rock combined test piece until the coal-rock combined test piece is damaged;
wherein the rate of load application is 1 KN/s.
4. The method for testing the partitioned energy storage characteristics of the coal-rock combination according to any one of claims 1 to 3, wherein the step of obtaining the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level comprises the following steps:
acquiring stress-strain curves of the coal and the rock at all levels of load levels according to the stress-strain data of the coal and the rock at all levels of load levels;
and acquiring the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level according to the stress-strain curve of the coal and the rock at each level of load level.
5. The method for testing the partitioned energy storage characteristics of the coal-rock complex as claimed in claim 4, wherein the obtaining of the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level comprises:
obtaining an energy evolution equation through fitting analysis according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level;
and acquiring the peak input energy density, the peak elastic energy density and the peak dissipation energy density of the coal and the rock according to the energy evolution equation and the peak strength of the coal and rock combined test piece in the single-shaft multistage cyclic loading and unloading test.
6. The utility model provides a test coal petrography assembly subregion energy storage characteristic's device which characterized in that includes:
the first acquisition module is used for acquiring the average uniaxial compressive strength of a plurality of coal and rock combined test pieces in a uniaxial compression test;
the second acquisition module is used for acquiring stress-strain data of the coal and rock under each level of load in a single-shaft multi-level cyclic loading and unloading test of the coal and rock combined test piece;
the first calculation module is used for acquiring the input energy density, the elastic energy density and the dissipated energy density of the coal and the rock at each level of load level according to the stress-strain data of the coal and the rock at each level of load level;
the second calculation module is used for acquiring the peak input energy density, the peak elastic energy density and the peak dissipated energy density of the coal and the rock according to the input energy density, the elastic density and the dissipated energy density of the coal and the rock at each level of load level;
wherein, the single-shaft multistage circulation loading and unloading test comprises the following steps:
and after applying a load to the coal rock combined test piece to 80-100% of the average uniaxial compressive strength, applying a load to the coal rock combined test piece until the coal rock combined test piece is damaged.
7. The device for testing the partitioned energy storage characteristics of the coal-rock combination according to claim 6, wherein in the uniaxial multistage cyclic loading and unloading test:
the difference value of the loads of two adjacent stages is 5KN, the speed of applying and unloading the loads is 1KN/s, and the minimum value of the applied loads during unloading is 1KN-3 KN.
8. The device for testing the partitioned energy storage characteristics of the coal-rock composite body according to claim 6, wherein the uniaxial compression test comprises:
gradually applying load to the coal-rock combined test piece until the coal-rock combined test piece is damaged;
wherein the rate of load application is 1 KN/s.
9. An apparatus for testing energy storage characteristics of coal-rock combinations in different zones, comprising:
the coal rock combined test piece comprises an upper pressure head and a lower pressure head, wherein the upper pressure head is matched with the lower pressure head and is used for pressing the coal rock combined test piece as claimed in any one of claims 1-5;
the upper fixing ring is fixed on the upper pressure head and is vertical to the central shaft of the upper pressure head;
the lower fixing ring is fixed on the lower pressure head and is vertical to the central shaft of the lower pressure head;
the middle fixing ring is fixed at the junction of coal and rock in the coal and rock combined test piece and is parallel to the upper fixing ring and the lower fixing ring;
the upper displacement sensor is vertically arranged between the upper fixing ring and the middle fixing ring;
the lower displacement sensor is vertically arranged between the lower fixing ring and the middle fixing ring;
the upper annular extensometer is parallel to the upper pressure head and is arranged at the upper part of the coal rock combined test piece;
and the lower annular extensometer is parallel to the lower pressure head and is arranged at the lower part of the coal rock combined test piece.
10. An electronic device, comprising:
at least one processor, at least one memory, a communication interface, and a bus; wherein the content of the first and second substances,
the processor, the memory and the communication interface complete mutual communication through the bus;
the memory stores program instructions executable by the processor, wherein the processor invokes the program instructions to perform the method of any of claims 1-5.
CN201910968592.9A 2019-10-12 2019-10-12 Method and device for testing partitioned energy storage characteristics of coal-rock combination Pending CN110836953A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111289388A (en) * 2020-03-24 2020-06-16 山东科技大学 Coal-rock combination impact tendency evaluation method considering damage effect
CN111366452A (en) * 2020-03-26 2020-07-03 北京科技大学 Method for measuring energy storage level of self-energy-storage rock mass

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102798372A (en) * 2012-08-17 2012-11-28 四川大学 Automatic rock volume deformation measuring sensor and rock test-piece volume deformation measuring method
CN104697868A (en) * 2015-03-31 2015-06-10 辽宁工程技术大学 Static-dynamic combined loading device used for rockburst simulation experiment
CN105043903A (en) * 2015-06-26 2015-11-11 黑龙江科技大学 Rock burst/rock explosion analog simulation energy storage-time tank device
CN107328643A (en) * 2017-06-20 2017-11-07 山东科技大学 Under dead load in coal petrography assembly test specimen coal dynamic characteristic test method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102798372A (en) * 2012-08-17 2012-11-28 四川大学 Automatic rock volume deformation measuring sensor and rock test-piece volume deformation measuring method
CN104697868A (en) * 2015-03-31 2015-06-10 辽宁工程技术大学 Static-dynamic combined loading device used for rockburst simulation experiment
CN105043903A (en) * 2015-06-26 2015-11-11 黑龙江科技大学 Rock burst/rock explosion analog simulation energy storage-time tank device
CN107328643A (en) * 2017-06-20 2017-11-07 山东科技大学 Under dead load in coal petrography assembly test specimen coal dynamic characteristic test method

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
刘建新 等: "《煤岩串联组合模型及冲击地压机理的研究》", 《岩土工程学报》 *
王宁 等: "《坚硬煤岩组合体变形破坏特征及冲击特性研究》", 《长江科学院院报》 *
陈岩 等: "《煤岩组合体破坏行为的能量非线性演化特征》", 《地下空间与工程学报》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111289388A (en) * 2020-03-24 2020-06-16 山东科技大学 Coal-rock combination impact tendency evaluation method considering damage effect
CN111289388B (en) * 2020-03-24 2022-04-29 山东科技大学 Coal-rock combination impact tendency evaluation method considering damage effect
CN111366452A (en) * 2020-03-26 2020-07-03 北京科技大学 Method for measuring energy storage level of self-energy-storage rock mass
CN111366452B (en) * 2020-03-26 2021-01-29 北京科技大学 Method for measuring energy storage level of self-energy-storage rock mass

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