CN109490119B - Method for determining damage variable of rock material - Google Patents
Method for determining damage variable of rock material Download PDFInfo
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- CN109490119B CN109490119B CN201811523932.9A CN201811523932A CN109490119B CN 109490119 B CN109490119 B CN 109490119B CN 201811523932 A CN201811523932 A CN 201811523932A CN 109490119 B CN109490119 B CN 109490119B
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- 239000011435 rock Substances 0.000 title claims abstract description 174
- 239000000463 material Substances 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000035699 permeability Effects 0.000 claims abstract description 49
- 238000011144 upstream manufacturing Methods 0.000 claims description 70
- 239000012530 fluid Substances 0.000 claims description 36
- 238000012360 testing method Methods 0.000 claims description 35
- 230000008878 coupling Effects 0.000 claims description 21
- 238000010168 coupling process Methods 0.000 claims description 21
- 238000005859 coupling reaction Methods 0.000 claims description 21
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000001066 destructive effect Effects 0.000 claims description 6
- 230000002706 hydrostatic effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000011160 research Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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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
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
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Abstract
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a method for determining damage variables of rock materials. The determination method comprises the following steps: determining the permeability of the rock material in a nondestructive state; determining the permeability of the rock material in a damaged state; and determining the damage variable of the rock material according to the determined permeability of the rock material in the nondestructive state and the determined permeability of the rock material in the damage state. According to the method for determining the damage variable of the rock material, which is provided by the invention, the damage variable is defined based on the permeability of the rock material, the permeability measurement has no damage to the rock material and no influence on subsequent research, the damage degree of the rock material when the development degree of internal cracks is low can be accurately and sensitively reflected, the practicability, the accuracy and the sensitivity are higher, and the obtained result is more practical.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a method for determining damage variables of rock materials.
Background
Loads acting on rock mass engineering and caused by human activities or environment are basically cyclic dynamic loads which change along with time, for example, in the construction and service periods of deep mines, traffic tunnels and water conservancy and hydropower engineering, rocks bear static loads such as certain self-weight stress, structural stress and the like, and also bear dynamic cyclic loads caused by factors such as excavation disturbance, blasting, earthquake and the like. The cracks of the rock materials are continuously initiated, expanded and communicated with each other under the action of dynamic and static coupled fatigue loads, so that the rock materials are easy to damage, even destabilize and destroy, and huge casualties and economic losses are caused. Therefore, how to quantitatively describe the damage degree of the fatigue load to the rock material has very important significance for preventing and treating the rock engineering disaster. At present, there are many methods for determining the damage degree of rock materials, and among them, there are damage variables defined based on parameters such as ultrasonic wave velocity, acoustic emission signal, electromagnetic radiation signal, rock elastic modulus, and the like. However, the damage variables defined by the above parameters have certain limitations. Therefore, the method for determining the damage variable of the rock material, which is free of damage, high in accuracy and strong in sensitivity, has important significance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for determining the damage variable of the rock material, which has no damage, high accuracy and strong sensitivity.
The invention realizes the purpose through the following technical scheme:
a method of determining a rock material damage variable, the method of determining comprising:
determining the permeability of the rock material in a nondestructive state;
determining the permeability of the rock material in a damaged state;
determining a permeability-based rock material damage variable according to equation 1), said equation 1) being:
in the formula 1: dKFor permeability-based rock material damage variables, K0Permeability of rock material in a non-destructive state;
permeability in a damaged state of the rock material.
Further, the permeability of the rock material in a nondestructive state and a damage state is determined through a multi-field coupling test system, wherein the multi-field coupling test system comprises a confining pressure chamber, an axial loading piston, an upper pressure head, a loading base, a rubber sleeve, an upstream pressure container, a downstream pressure container and a data acquisition and analysis system, and the multi-field coupling test system comprises:
the axial loading piston is movably arranged at the top of the confining pressure chamber along the axial direction of the confining pressure chamber;
the upper pressure head is arranged in the confining pressure chamber, and the upper pressure head is separably contacted with the action end of the axial loading piston;
the bottom of the confining chamber is arranged on the loading base;
the upper pressure head is connected with the loading base in a sealing mode through the rubber sleeve;
the upstream pressure container is arranged outside the confining pressure chamber, and the output end of the upstream pressure container is connected with the upper pressure head through a pipeline;
the downstream pressure container is arranged outside the confining chamber, and the output end of the downstream pressure container is connected with the loading base through a pipeline;
the data acquisition and analysis system is connected with the upstream pressure container and the downstream pressure container.
Further, the determining the permeability of the rock material in a non-destructive state specifically comprises:
placing a rock material in the rubber sleeve between an upper pressure head and the loading base of the multi-field coupling test system, wherein the height of the rock material is L, and the cross-sectional area of the rock material is A;
filling oil into the confining pressure chamber, and applying hydrostatic pressure to the confining pressure chamber to keep the inside and the outside of the rubber sleeve stable;
from volume V1And an upstream pressure vessel of volume V2Respectively injecting fluids with viscosity coefficient mu and compression coefficient beta into the upstream and downstream of the rock material, and simultaneously recording the change and time of the upstream and downstream fluid pressures of the rock material in real time by a data acquisition and analysis system according to the set time interval of data point acquisition until the upstream and downstream pressures of the rock material tend to be stable so as to establish uniform fluid pressure in the rock material;
after uniform fluid pressure is built in the rock material, the fluid pressure injected upstream of the rock material is raised, and the downstream fluid pressure is kept constant, so that an initial pressure difference delta P is built between the upstream end and the downstream end of the rock sample0；
The data acquisition and analysis system starts to record the change and time of the upstream and downstream pressures of the rock material again in real time according to the set time interval for acquiring data points until the upstream and downstream pressures are consistent, and the test is stopped;
according to the upstream and downstream pressures and time of the rock material recorded by the data acquisition and analysis system, the upstream and downstream pressure difference delta P of the rock material at any data point acquisition time is calculatedi0And the time Δ t between the time of any collected data point and the start of the triali0；
Calculating the permeability K of the rock material under the lossless state according to the formula 2)0The formula 2) is:
further, determining the permeability of the rock material in the damaged state specifically includes:
placing a rock material in the rubber sleeve between an upper pressure head and the loading base of the multi-field coupling test system, wherein the height of the rock material is L, and the cross-sectional area of the rock material is A;
filling oil into the confining pressure chamber, and applying hydrostatic pressure to the confining pressure chamber to keep the inside and the outside of the rubber sleeve stable;
the axial loading piston is in close contact with the upper pressure head, and axial fatigue loading is carried out on the rock material through the axial loading piston;
after the rock material is damaged, the axial loading piston stops loading and unloading;
after fatigue loading is carried out on the rock material, damage cracks in the rock material continuously germinate and expand and are communicated with each other;
from volume V1And an upstream pressure vessel of volume V2Respectively injecting fluids with viscosity coefficient mu and compression coefficient beta into the upstream and downstream of the rock material, and simultaneously recording the change and time of the upstream and downstream fluid pressures of the rock material in real time by a data acquisition and analysis system according to the set time interval of data point acquisition until the upstream and downstream pressures of the rock material tend to be stable so as to establish uniform fluid pressure in the rock material;
after uniform fluid pressure is built in the rock material, the fluid pressure injected upstream of the rock material is raised, and the downstream fluid pressure is kept constant, so that an initial pressure difference delta P is built between the upstream end and the downstream end of the rock sample0；
The data acquisition and analysis system starts to record the change and time of the upstream and downstream pressures of the rock material again in real time according to the set time interval for acquiring data points until the upstream and downstream pressures are consistent, and the test is stopped;
according to the upstream and downstream pressures and time of the rock material recorded by the data acquisition and analysis system, the upstream and downstream pressure difference of the rock material at any data point acquisition time is calculated
And the time between the time of any collected data point and the start time of the test
Calculating the permeability of the rock material in a damaged state according to the formula 3)
The formula 3) is:
further, the both ends of rubber sleeve respectively through the clamp with go up the pressure head and the loading base is connected, through opening of clamp, makes things convenient for putting into of rock material in the rubber sleeve.
Furthermore, the top of the confining pressure chamber is connected with the loading base through a plurality of screws, the screws are arranged around the central shaft of the confining pressure chamber at equal angular intervals, and the confining pressure chamber and the loading base are conveniently separated through loading of the screws, so that rock materials are further conveniently put into the confining pressure chamber.
The invention has the beneficial effects that:
according to the method for determining the damage variable of the rock material, which is provided by the invention, the damage variable is defined based on the permeability of the rock material, the permeability measurement has no damage to the rock material and no influence on subsequent research, the damage degree of the rock material when the development degree of internal cracks is low can be accurately and sensitively reflected, the practicability, the accuracy and the sensitivity are higher, and the obtained result is more practical.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a multi-field coupling test system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a multi-field coupling testing system for permeability of rock material in a non-destructive state;
FIG. 3 is a schematic diagram of a multi-field coupling test system performing fatigue loading on a rock material;
fig. 4 is a graph of experimental effects.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The embodiment of the invention discloses a method for determining damage variables of rock materials, which comprises the following steps:
determining the permeability of the rock material in a nondestructive state;
determining the permeability of the rock material in a damaged state;
determining a permeability-based rock material damage variable according to equation 1), equation 1) being:
in equation 1): dKFor permeability-based rock material damage variables, K0Permeability of rock material in a non-destructive state;
permeability in a damaged state of the rock material.
Further, in the embodiment of the invention, the permeability of the rock material in a nondestructive state and a damage state is determined by a multi-field coupling test system. Fig. 1 is a schematic structural diagram of a multi-field coupling test system according to an embodiment of the present invention, and referring to fig. 1, the multi-field coupling test system includes a confining pressure chamber 2, an axial loading piston 1, an upper pressure head 11, a loading base 6, a rubber sleeve 10, an upstream pressure vessel 5, a downstream pressure vessel 9, and a data acquisition and analysis system 7, where:
the axial loading piston 1 is movably arranged at the top of the confining pressure chamber 2 along the axial direction of the confining pressure chamber 2;
the upper pressure head 11 is arranged in the confining pressure chamber 2, and the upper pressure head 11 is separably contacted with the action end of the axial loading piston 1;
the bottom of the confining pressure chamber 2 is arranged on the loading base 6;
the upper pressure head 11 is hermetically connected with the loading base 6 through a rubber sleeve 10;
the upstream pressure container 5 is arranged outside the confining pressure chamber 2, and the output end of the upstream pressure container 5 is connected with the upper pressure head 11 through a pipeline;
the downstream pressure container 9 is arranged outside the confining pressure chamber 2, and the output end of the downstream pressure container 9 is connected with the loading base 6 through a pipeline;
the data acquisition and analysis system 7 is connected with the upstream pressure vessel 5 and the downstream pressure vessel 9.
In the coupling test of the rock material 8, the rock material 8 is placed in the rubber sleeve 10.
Further, referring to fig. 1, two ends of a rubber sleeve 10 according to an embodiment of the present invention are respectively connected through a clamp 4, an upper pressing head 11 and a loading base 6, and rock materials are conveniently placed in the rubber sleeve by opening the clamp.
Further, with reference to fig. 1, the top of the confining pressure chamber 2 and the loading base 6 of the embodiment of the invention are connected through a plurality of screws 3, the plurality of screws 3 are arranged around the central axis of the confining pressure chamber 2 at equal angular intervals, and the confining pressure chamber and the loading base are conveniently separated by loading the screws, so that the rock material is further conveniently put in.
Fig. 2 is a schematic diagram of a multi-field coupling test system for determining permeability of a rock material in a nondestructive state, and with reference to fig. 2, in an embodiment of the present invention, determining permeability of the rock material in the nondestructive state specifically includes:
placing a rock material 8 in a rubber sleeve 10 between an upper pressure head 11 and a loading base 6 of a multi-field coupling test system, wherein the height of the rock material 8 is L, and the cross-sectional area is A;
filling oil into the confining pressure chamber 2, and applying hydrostatic pressure to the confining pressure chamber 2, so that not only can the inside and the outside of the rubber sleeve 10 be kept stable, but also the rubber sleeve 10 can be in close contact with the rock material 8, and the phenomenon that the rubber sleeve 10 expands due to a subsequent test is prevented;
from volume V1And an upstream pressure vessel 5 of volume V2Respectively injecting fluids with viscosity coefficient mu and compression coefficient beta into the upstream and downstream of the rock material 8 in the downstream pressure container 9, and simultaneously recording the change and time of the upstream and downstream fluid pressure of the rock material 8 in real time by the data acquisition and analysis system 7 according to the set time interval of data point acquisition until the upstream and downstream pressure of the rock material tend to be stable so as to establish uniform fluid pressure in the rock material;
after a uniform fluid pressure is established within the rock material, the fluid pressure injected upstream of the rock material 8 is raised and the downstream fluid pressure is maintained, thereby establishing an initial pressure differential Δ P across the upstream and downstream ends of the rock sample0；
The data acquisition and analysis system 7 starts to record the change and time of the upstream and downstream pressures of the rock material again in real time according to the set time interval for acquiring data points until the upstream and downstream pressures are consistent, and the test is stopped;
according to the rock material pressure difference and time recorded by the data acquisition and analysis system 7, the upstream and downstream pressure difference delta P of the rock material at any data point acquisition time is calculatedi0And the time Δ t between the time of any collected data point and the start of the triali0；
Calculating the permeability K of the rock material under the lossless state according to the formula 2)0Equation 2) is:
fig. 3 is a schematic diagram of a multi-field coupling test system for fatigue loading of a rock material, and with reference to fig. 3, in an embodiment of the present invention, the difference between determining the permeability of the rock material in a damaged state and determining the permeability of the rock material in a non-damaged state is that a loading device 12 needs to load a power to an axial loading piston 1, and further applies a pressure to a rock sample 8, so as to damage the rock sample 8, which specifically includes:
placing a rock material 8 in a rubber sleeve 10 between an upper pressure head 11 and a loading base 6 of a multi-field coupling test system, wherein the height of the rock material 8 is L, and the cross-sectional area is A;
filling oil into the confining pressure chamber 2, and applying hydrostatic pressure to the confining pressure chamber 2 to keep the inside and the outside of the rubber sleeve 10 stable;
the axial loading piston 1 is in close contact with the upper pressure head 11, and the axial loading piston 1 is used for carrying out axial fatigue loading on the rock material 8;
after the rock material 8 is damaged, the axial loading piston 1 stops loading and is unloaded;
after fatigue loading is carried out on the rock material 8, the damage cracks 13 in the rock material 8 are continuously initiated, expanded and communicated with each other to form a state shown in figure 1;
from volume V1And an upstream pressure vessel 5 of volume V2Respectively injecting fluids with viscosity coefficient mu and compression coefficient beta into the upstream and downstream of the rock material 8 in the downstream pressure container 9, and simultaneously recording the change and time of the upstream and downstream fluid pressure of the rock material 8 in real time by the data acquisition and analysis system 7 according to the set time interval of data point acquisition until the upstream and downstream pressure of the rock material tend to be stable so as to establish uniform fluid pressure in the rock material;
after a uniform fluid pressure is established within the rock material, the fluid pressure injected upstream of the rock material 8 is raised and the downstream fluid pressure is maintained, thereby establishing an initial pressure differential Δ P across the upstream and downstream ends of the rock sample0；
The data acquisition and analysis system 7 starts to record the change and time of the upstream and downstream pressures of the rock material again in real time according to the set time interval for acquiring data points until the upstream and downstream pressures are consistent, and the test is stopped;
according to the rock material pressure difference and time recorded by the data acquisition and analysis system 7, the rock material upstream and downstream pressure difference at any data point acquisition time is calculated
And the time between the time of any collected data point and the start time of the test
Calculating the permeability of the rock material in a damaged state according to the formula 3)
Equation 3) is:
the embodiment of the invention is implemented by changing the permeability K of the rock material in a nondestructive state0And permeability of rock material in damaged condition
Substitution into the formula:
the rock material damage variable D based on permeability definition can be determinedK。
The rock materials adopted by the embodiment of the invention are all from one rock body, the homogeneity is good, the permeability of at least three samples which are not subjected to fatigue loading is tested, and the average sample is taken as the permeability K under the lossless state0。
Table 1 shows a loading scheme for testing permeability of a rock in a loss state by using a multi-field coupling test system, table 2 shows a test result table of the loading scheme shown in table 1, and fig. 4 shows a test effect graph, which is obtained from table 2 and fig. 4, where a damage variable and a fatigue load loading frequency are in a positive correlation relationship, and the larger the loading frequency is, the larger the damage variable is. The rock material is damaged under the action of fatigue load, cracks continuously grow, expand and are communicated with one another, so that the permeability of the rock material is increased, and the permeability is gradually increased. The data measured by the test sew up the evolution law of the damage variable after the rock material is affected by the fatigue load.
TABLE 1
TABLE 2
The following embodiments are provided for the purpose of illustrating the present invention and are not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the technical features of the present invention can be modified or changed in some ways without departing from the scope of the present invention.
Claims (3)
1. A method of determining a damage variable of a rock material, the method comprising:
determining the permeability of the rock material in a nondestructive state;
determining the permeability of the rock material in a damaged state;
determining a permeability-based rock material damage variable according to equation 1), said equation 1) being:
in the formula 1): dKFor permeability-based rock material damage variables, K0Permeability of rock material in a non-destructive state;
permeability of rock material in a damaged state;
the permeability of the rock material in a nondestructive state and a damage state is determined through a multi-field coupling test system, the multi-field coupling test system comprises a confining pressure chamber (2), an axial loading piston (1), an upper pressure head (11), a loading base (6), a rubber sleeve (10), an upstream pressure container (5), a downstream pressure container (9) and a data acquisition and analysis system (7), wherein:
the axial loading piston (1) is movably arranged at the top of the confining pressure chamber (2) along the axial direction of the confining pressure chamber (2);
the upper pressure head (11) is arranged in the confining pressure chamber (2), and the upper pressure head (11) is separably contacted with the action end of the axial loading piston (1);
the bottom of the confining pressure chamber (2) is arranged on the loading base (6);
the upper pressure head (11) is connected with the loading base (6) in a sealing way through the rubber sleeve (10);
the upstream pressure container (5) is arranged outside the confining pressure chamber (2), and the output end of the upstream pressure container (5) is connected with the upper pressure head (11) through a pipeline;
the downstream pressure vessel (9) is arranged outside the confining pressure chamber (2), and the output end of the downstream pressure vessel (9) is connected with the loading base (6) through a pipeline;
the data acquisition and analysis system (7) is connected with the upstream pressure container (5) and the downstream pressure container (9);
the determining the permeability of the rock material in a non-destructive state specifically comprises:
placing a rock material (8) in the rubber sleeve (10) between an upper pressure head (11) and the loading base (6) of the multi-field coupling test system, wherein the height of the rock material (8) is L, and the cross-sectional area is A;
filling oil into the confining pressure chamber (2), and applying hydrostatic pressure to the confining pressure chamber (2) to keep the inside and the outside of the rubber sleeve (10) stable;
from volume V1And an upstream pressure vessel (5) of volume V2Respectively injecting fluids with viscosity coefficient mu and compression coefficient beta into the upstream and downstream of the rock material (8) in the downstream pressure container (9), and simultaneously recording the change and time of the upstream and downstream fluid pressure of the rock material (8) in real time by the data acquisition and analysis system (7) according to the set time interval of data point acquisition until the upstream and downstream pressure of the rock material tend to be stable so as to establish uniform fluid pressure in the rock material;
after a uniform fluid pressure is established within the rock material, the fluid pressure injected upstream of the rock material (8) is raised and the downstream fluid pressure is maintained, thereby establishing an initial pressure differential Δ P across the upstream and downstream ends of the rock sample0；
The data acquisition and analysis system (7) starts to record the change and time of the upstream and downstream pressures of the rock material again in real time according to the set time interval for acquiring data points until the upstream and downstream pressures are consistent, and the test is stopped;
according to the upstream and downstream pressures and time of the rock material recorded by the data acquisition and analysis system (7), the upstream and downstream pressure difference delta P of the rock material at any data point acquisition time is calculatedi0And the time Δ t between the time of any collected data point and the start of the triali0；
Calculating the permeability K of the rock material under the lossless state according to the formula 2)0The formula 2) is:
the determination of the permeability of the rock material in the damaged state specifically comprises:
placing a rock material (8) in the rubber sleeve (10) between an upper pressure head (11) and the loading base (6) of the multi-field coupling test system, wherein the height of the rock material (8) is L, and the cross-sectional area is A;
filling oil into the confining pressure chamber (2), and applying hydrostatic pressure to the confining pressure chamber (2) to keep the inside and the outside of the rubber sleeve (10) stable;
the axial loading piston (1) is in close contact with the upper pressure head (11), and the axial loading piston (1) is used for carrying out axial fatigue loading on the rock material (8);
after the rock material (8) is damaged, the axial loading piston (1) stops loading and is unloaded;
after fatigue loading is carried out on the rock material (8), damage cracks (13) in the rock material (8) are continuously initiated, expanded and communicated with each other;
from volume V1And an upstream pressure vessel (5) of volume V2Respectively injecting fluids with viscosity coefficient mu and compression coefficient beta into the upstream and downstream of the rock material (8) in the downstream pressure container (9), and simultaneously recording the change and time of the upstream and downstream fluid pressure of the rock material (8) in real time by the data acquisition and analysis system (7) according to the set time interval of data point acquisition until the upstream and downstream pressure of the rock material tend to be stable so as to establish uniform fluid pressure in the rock material;
after a uniform fluid pressure is established within the rock material, the fluid pressure injected upstream of the rock material (8) is raised and the downstream fluid pressure is maintained, thereby establishing an initial pressure differential Δ P across the upstream and downstream ends of the rock sample0；
The data acquisition and analysis system (7) starts to record the change and time of the upstream and downstream pressures of the rock material again in real time according to the set time interval for acquiring data points until the upstream and downstream pressures are consistent, and the test is stopped;
according to the upstream and downstream pressures and time of the rock material recorded by the data acquisition and analysis system (7), the upstream and downstream pressure difference of the rock material at any data point acquisition time is calculated
And any collected data point time intervalTime of starting test
Calculating the permeability of the rock material in a damaged state according to the formula 3)
The formula 3) is:
2. a method for determining a damage variable of a rock material according to claim 1, characterized in that both ends of the rubber sleeve (10) are connected with the upper ram (11) and the loading bed (6) through a clamp (4), respectively.
3. A method of determining a damage variable of a rock material according to claim 1, characterized in that the top of the confining pressure chamber (2) and the loading base (6) are connected by a plurality of screws (3), the plurality of screws (3) being arranged at equiangular intervals around the central axis of the confining pressure chamber (2).
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| CN109946166A (en) * | 2019-03-22 | 2019-06-28 | 湘潭大学 | A kind of rock confining pressure simulator |
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