CN111693441A - Test device and test method for simulating rock seepage - Google Patents
Test device and test method for simulating rock seepage Download PDFInfo
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- CN111693441A CN111693441A CN202010708802.3A CN202010708802A CN111693441A CN 111693441 A CN111693441 A CN 111693441A CN 202010708802 A CN202010708802 A CN 202010708802A CN 111693441 A CN111693441 A CN 111693441A
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- 239000011435 rock Substances 0.000 title claims abstract description 43
- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 100
- 230000003204 osmotic effect Effects 0.000 claims abstract description 53
- 230000035699 permeability Effects 0.000 claims abstract description 32
- 230000005012 migration Effects 0.000 claims abstract description 26
- 238000013508 migration Methods 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims description 9
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- 230000035515 penetration Effects 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000003631 expected effect Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
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- 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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Abstract
The invention provides a test device for simulating rock seepage and a test method thereof, belonging to the technical field of geotechnical engineering and comprising a sample rack and an image collector, wherein the sample rack is used for placing a sample to be tested, the sample rack is connected with a loading assembly, the loading assembly is connected with a servo pump set, the servo pump set applies dynamic load to the sample to be tested through the loading assembly and injects seepage fluid into the sample to be tested, the sample to be tested is communicated with a liquid collector, the liquid collector collects the seepage fluid flowing out of the sample to be tested, and the seepage rate of the sample to be tested is calculated through the amount of the seepage fluid in the liquid collector. The image collector faces the sample to be detected and is used for collecting images of migration paths of the osmotic fluid in the sample to be detected, effectively and visually observing migration rules of the osmotic fluid in a pore medium of the sample to be detected, and microscopically enabling changes of the osmotic fluid state and calculation results of permeability to mutually verify.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a test device and a test method for simulating rock seepage.
Background
In underground engineering, the excavated surrounding rock of the chamber is obviously changed in physical and mechanical properties under the action of various external disturbances, wherein dynamic loads such as mechanical drilling, traffic load and the like are important influence factors. Rock permeability is an important indicator for evaluating stability of subterranean projects.
In the indoor test, the most of the prior art schemes are to test the permeability of a rock sample under the condition that the rock sample is compressed by static load. The test method ensures that the load borne by the rock sample is single and cannot comprehensively reflect the penetration rule of the rock sample.
Disclosure of Invention
The invention aims to provide a test device for simulating rock seepage and a test method thereof, which can reflect the change rule of the rock permeability under dynamic load disturbance from a microscopic angle.
The embodiment of the invention is realized by the following steps:
the invention provides a test device for simulating rock seepage, which comprises a sample rack and an image collector, wherein the sample rack is used for placing a sample to be tested, the sample rack is connected with a loading assembly, the loading assembly is connected with a servo pump set, the servo pump set applies a dynamic load to the sample to be tested through the loading assembly and injects seepage fluid, the sample to be tested is communicated with a liquid collector, the liquid collector collects the seepage fluid flowing out of the sample to be tested, and the image collector faces the sample to be tested and is used for collecting images of a migration path of the seepage fluid in the sample to be tested.
Optionally, the servo pump group includes a hydraulic pump and an axial pressure pump, the hydraulic pump is used for injecting osmotic fluid into the sample to be tested, and the axial pressure pump is used for applying dynamic load to the sample to be tested.
Optionally, the loading subassembly include the reaction plate, with pressure head and piston that the reaction plate is connected, the reaction plate with the piston is established respectively the relative both ends of sample frame, the pressure head correspondence is located and is close to the one end of the sample that awaits measuring, the axle pressure pump with the piston intercommunication, with pass through the piston to the sample that awaits measuring applys dynamic load, the hydraulic pump with the pressure head intercommunication, with pass through the pressure head to the sample that awaits measuring injects infiltration fluid.
Optionally, the hydraulic pump is in communication with the head through a fluid delivery conduit.
Optionally, the hydraulic pump communicates with the piston through a first axial pressure passage and a second axial pressure passage, respectively.
Optionally, the sample holder includes two support columns disposed oppositely and a base located between the two support columns, and the base is connected to the piston.
Optionally, the image collector is a high-speed camera.
In another aspect of the embodiments of the present invention, there is provided a test apparatus for simulating rock seepage, where the test apparatus for simulating rock seepage is adopted, and the method includes: preparing and installing a sample to be tested; applying a dynamic load to the sample to be tested; injecting a penetrating fluid into the sample to be tested; acquiring a migration path of a permeation fluid in a sample to be detected; and acquiring the osmotic fluid flowing out of the sample to be tested, and calculating the permeability of the sample to be tested.
Optionally, the applying a dynamic load to the sample to be tested includes: applying a pre-tightening load to the sample to be tested to enable one end of the sample to be tested to be abutted against the loading assembly so as to pre-tighten the sample to be tested; and applying a dynamic load to the sample to be tested.
Optionally, the sample that awaits measuring includes the casing, the casing has two openings of two relative settings, is used for making respectively infiltration fluid flows in and flows out, be equipped with the skeleton in the casing, the skeleton includes a plurality of parallel arrangement's monomer, and is adjacent be equipped with the clearance between the monomer, be equipped with transparent cover on one of the casing, the image collector orientation transparent cover.
The embodiment of the invention has the beneficial effects that:
according to the test device and the test method for simulating rock seepage provided by the embodiment of the invention, a sample to be tested is placed in a sample rack, the sample rack is connected with a loading assembly, a servo pump applies a dynamic load to one end of the sample to be tested through the loading assembly, the servo pump also injects seepage fluid into the other end of the sample to be tested through the loading assembly, so that the seepage fluid flows among pores of the sample to be tested, a liquid collector collects the seepage fluid flowing out of the sample to be tested, and the permeability of the sample to be tested under dynamic load disturbance can be calculated by adopting Darcy's law through the quantity of the seepage fluid in the liquid collector. The image collector faces the sample to be detected and is used for collecting images of the migration path of the osmotic fluid in the sample to be detected and acquiring the flowing process of the osmotic fluid in the sample to be detected so as to obtain the migration path of the osmotic fluid in the sample to be detected. The migration rule of the osmotic fluid in the pore medium of the sample to be detected and the obvious change of the osmotic fluid state after different forms of dynamic parameters are applied can be effectively and visually observed through the migration path and the permeability of the osmotic fluid in the sample to be detected, and the change of the osmotic fluid state and the calculation result of the permeability are verified mutually microscopically, so that the method has an important mechanism effect on fundamentally explaining the change (increase or decrease) of the permeability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a test apparatus for simulating rock seepage according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a sample to be tested according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a migration path of a permeation fluid in a sample to be tested under dynamic load disturbance;
FIG. 4 is one of the significant changes in the permeation media under dynamic load disturbances and the expected effects of the present solution;
FIG. 5 is a graph showing the significant change in the permeation media under dynamic load disturbance and the second expected effect of the present solution;
FIG. 6 is a flow chart of a test method for simulating rock seepage according to an embodiment of the present invention.
Icon: 1-reaction plate; 2-a pressure head; 3-a support column; 4-a piston; 5-a sample to be tested; 51-a housing; 52-monomer; 53-transparent cover plate; 54-a screen; 55-pore space; 6-a base; 7-a servo pump group; 81-an infusion tube; 82-a drainage conduit; 83-a liquid trap; 91-a first axial pressure channel; 92-a second axial compression channel; 10-a high-speed camera; 11-osmotic fluid.
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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In underground engineering, the excavated surrounding rock of the chamber is obviously changed in physical and mechanical properties under the action of various external disturbances, wherein dynamic loads such as mechanical drilling, traffic load and the like are important influence factors. Rock permeability is an important indicator for evaluating stability of subterranean projects. In the indoor test, the most of the prior art schemes are to test the permeability of a rock sample under the condition that the rock sample is compressed by static load.
In order to clarify the movement and migration rules of the osmotic fluid 11 under the action of the periodic dynamic load and present the movement track of the osmotic fluid in the model sample in an image and intuitive manner, the embodiment provides a test device and a test method for simulating rock seepage, aiming at the research of rock permeability under dynamic load disturbance, mainly applying periodic alternate load to the sample 5 to be tested, and obtaining the change rule of the sample permeability from a macroscopic angle. Meanwhile, the migration rule of the osmotic fluid 11 in the rock under the dynamic load disturbance is explored from a microscopic angle, so that the direct reason of the permeability increase or decrease under the action of the periodic load is explained and explained from a mechanism, and the mechanism is not only kept on the understanding of the regularity, so that the mechanism support is provided for researching the permeability rule of the surrounding rock.
Referring to fig. 1, the present embodiment provides a test apparatus for simulating rock seepage, which includes a sample rack and an image collector, wherein the sample rack is used for placing a sample 5 to be tested, the sample rack is connected with a loading assembly, the loading assembly is connected with a servo pump unit 7, the servo pump unit 7 applies a dynamic load to the sample 5 to be tested through the loading assembly and injects a seepage fluid 11 into the sample 5 to be tested, the sample 5 to be tested is communicated with a liquid collector 83, the liquid collector 83 collects the seepage fluid 11 flowing out from the sample 5 to be tested, and the image collector faces the sample 5 to be tested and is used for collecting an image of a migration path of the seepage fluid 11 in the.
The sample frame is used for placing the sample 5 that awaits measuring, and the sample frame includes two support columns 3 that set up relatively and is located base 6 between two support columns 3, and the sample 5 that awaits measuring presss from both sides between two support columns 3 to fix on base 6, and the sample frame is connected with the loading subassembly, and the loading subassembly includes reaction plate 1, pressure head 2 and piston 4 of being connected with reaction plate 1, and the loading subassembly is located the both ends of sample frame, and wherein one end is used for exerting dynamic load, the other end is used for infusing osmotic fluid 11.
Specifically, reaction plate 1 and piston 4 are established respectively at the relative both ends of sample frame, and pressure head 2 corresponds and is located the one end that is close to the sample 5 that awaits measuring, that is to say, reaction plate 1 and pressure head 2 are a set of, are located the open end of sample frame, and piston 4 is located sample frame and is equipped with 6 one ends of base, and piston 4 and base 6 are connected.
The loading assembly is connected with a servo pump set 7, and the servo pump set 7 applies dynamic load to the sample 5 to be tested through the loading assembly and injects osmotic fluid 11.
Specifically, the servopump group 7 includes a hydraulic pump for injecting the osmotic fluid 11 and an axial pressure pump for applying a dynamic load.
The axial pressure pump is connected with the piston 4, and applies dynamic load to the sample 5 to be tested through the piston 4 so as to simulate dynamic load disturbance. The hydraulic pump is connected with the pressure head 2, and the osmotic fluid 11 is injected into the sample 5 to be measured through the pressure head 2. Thus, a dynamic load is applied to one end of the sample 5 and the osmotic fluid 11 is injected into the other end.
The sample 5 to be measured is communicated with the liquid collector 83, the liquid collector 83 collects the seepage fluid 11 flowing out of the sample 5 to be measured, and the permeability of the sample 5 to be measured under dynamic load disturbance can be calculated by adopting Darcy's law according to the amount of the seepage fluid 11 in the liquid collector 83.
The image collector faces the sample 5 to be measured and is configured to collect an image of a migration path of the osmotic fluid 11 in the sample 5 to be measured, and specifically, the image collector may be a high-speed camera 10 and photograph a flow process of the osmotic fluid 11 in the sample 5 to be measured, so as to obtain the migration path of the osmotic fluid 11 in the sample 5 to be measured, as shown in fig. 3.
By correspondingly analyzing the migration path of the osmotic fluid 11 in the sample 5 to be measured under the disturbance load and the obtained permeability, the migration rule of the osmotic fluid 11 in the pore 55 medium of the sample 5 to be measured and the obvious change of the state of the osmotic fluid 11 after different forms of dynamic parameters are applied can be effectively and intuitively observed, and the change of the state of the osmotic fluid 11 and the calculation result of the permeability are microscopically verified to each other, which has an important mechanism effect on fundamentally explaining the change (increase or decrease) of the permeability.
It is emphasized that the osmotic fluid 11 in the simulation test is generally not usable with water, and a fluid with a relatively high viscosity should be used to flow slowly in the sample 5 to be tested, and the movement track of the osmotic fluid 11 is tracked by adding a harmless pigment to the osmotic fluid.
According to the test device for simulating rock seepage provided by the embodiment of the invention, a sample 5 to be tested is placed in a sample rack, the sample rack is connected with a loading assembly, a servo pump applies a dynamic load to one end of the sample 5 to be tested through the loading assembly, the servo pump also injects osmotic fluid 11 into the other end of the sample 5 to be tested through the loading assembly, so that the osmotic fluid 11 flows among pores 55 of the sample 5 to be tested, a liquid collector 83 collects the osmotic fluid 11 flowing out of the sample 5 to be tested, and the permeability of the sample 5 to be tested under dynamic load disturbance can be calculated by adopting Darcy's law according to the amount of the osmotic fluid 11 in the liquid collector 83. The image collector faces the sample 5 to be detected, and is used for collecting an image of a migration path of the osmotic fluid 11 in the sample 5 to be detected, and acquiring a flow process of the osmotic fluid 11 in the sample 5 to be detected, so as to obtain the migration path of the osmotic fluid 11 in the sample 5 to be detected. The migration path and permeability of the osmotic fluid 11 in the sample 5 to be tested, which are obtained under the disturbance load, can effectively and intuitively observe the migration rule of the osmotic fluid 11 in the pore 55 medium of the sample 5 to be tested, and the obvious change of the state of the osmotic fluid 11 after different forms of dynamic parameters are applied, microscopically verify the change of the state of the osmotic fluid 11 and the calculation result of the permeability, and have an important mechanism effect on fundamentally explaining the change (increase or decrease) of the permeability.
Specifically, the hydraulic pump is communicated with the pressure head 2 through the infusion pipeline 81, an infusion channel is arranged in the pressure head 2, two ends of the infusion pipeline 81 are respectively communicated with the hydraulic pump and the sample 5 to be tested, and the osmotic fluid 11 in the hydraulic pump can be injected into the sample 5 to be tested through the infusion pipeline 81.
On the other hand, the axial-pressure pump also communicates with the piston 4 through a first axial-pressure passage 91 and a second axial-pressure passage 92, respectively. The axial-pressure pump respectively conveys pressure oil to the piston 4 through the first axial-pressure channel 91 and the second axial-pressure channel 92, the pressure oil drives the piston 4 to extend out, the sample 5 to be tested is pushed to prop against the pressure head 2, and dynamic load is applied to the sample 5 to be tested.
The base 6 communicates with the liquid trap 83 via the liquid discharge line 82 to discharge the permeated fluid 11 flowing out of the sample 5 to be measured to the liquid trap 83 via the liquid discharge line 82. By the amount of the permeated fluid 11 in the liquid trap 83, the permeability of the test sample 5 to be tested under dynamic load disturbances can be determined with darcy's rhythm.
As shown in fig. 6, this embodiment further provides a test method for simulating rock seepage, which uses the above test apparatus for simulating rock seepage, and the method includes:
s100: a sample 5 to be tested is prepared and mounted.
The sample 5 to be measured comprises a shell 51, the shell 51 is provided with two openings which are oppositely arranged and are respectively used for enabling the osmotic fluid 11 to flow in and out, a framework is arranged in the shell 51 and comprises a plurality of monomers 52 which are arranged in parallel, a gap is arranged between every two adjacent monomers 52, a transparent cover plate 53 is arranged on one surface of the shell 51, and the image collector faces the transparent cover plate.
Fig. 2 shows a simplification of the rock microstructure and the method of fabrication. The sample 5 to be measured for simulating the rock mesostructure consists of a shell 51, a single body 52 and a transparent cover plate 53. The housing 51 is a rectangular frame having three openings, one opening for providing the transparent cover plate 53 and the other two openings for allowing the osmotic fluid 11 to flow in and out, respectively.
The framework is composed of a plurality of single bodies 52, the single bodies 52 are cylindrical, the height of the single bodies 52 is equal to the distance between the shell 51 and the transparent cover plate 53, and the single bodies are orderly arranged in a staggered mode. Gaps, namely pores 55, are left between the single bodies 52, and the medium characteristics of the pores 55, which are specific to the rock as a natural material, are well simulated. A screen 54 is interposed between the head 2 and the aligned monomers 52 for the purpose of filtering impurities.
The transparent cover 53 is provided to facilitate the photographing of the high speed camera 10, the high speed camera 10 photographs toward the transparent cover 53, the permeated fluid 11 flows through the pores 55 between the cells 52, and the high speed camera 10 can acquire the migration path of the permeated fluid 11 in the pores 55 through the transparent cover 53.
It is emphasized that the sample 5 to be measured can be a whole formed by carving a whole large rock block obtained from an engineering site by a high-precision carving machine to form a shell 51 and a skeleton, and then installing a transparent cover plate 53; the sample 5 to be tested can also be made by directly printing a material with better strength and transparency by adopting a 3D printing technology; the structure of the sample 5 to be measured is not limited to the shape shown in fig. 2, and may be an irregular structure such as a honeycomb structure.
S110: a dynamic load is applied to the sample 5 to be measured.
S111: after the sample 5 to be tested is installed, the hydraulic pump, the axial pressure pump and the like are started, a pre-tightening load is applied to the sample 5 to be tested, and one end of the sample 5 to be tested is abutted against the loading assembly so as to pre-tighten the sample 5 to be tested.
The sample 5 to be tested drives the piston 4 to move upwards under the action of the axial compression pump, and the sample 5 to be tested is in contact with the reaction plate 1 and has a certain pre-tightening effect.
S112: a dynamic load is applied to the sample 5 to be measured.
In this embodiment, a dynamic load is applied to the sample 5 to be measured by the axial pressure pump.
S120: the sample 5 to be measured is injected with a permeating fluid 11.
The hydraulic pump injects the permeating fluid 11 into the sample 5 to be measured through the infusion pipeline 81, and harmless pigment can be added into the permeating fluid 11, so that the high-speed camera 10 can conveniently and clearly shoot the migration path of the permeating fluid 11 in the sample 5 to be measured.
S130: the migration path of the osmotic fluid 11 in the sample 5 to be measured is obtained.
The whole process of the penetration test is shot by the high-speed camera 10, so that the movement direction of the penetration fluid 11 and the distribution state in the pores 55 of the sample 5 to be tested under the action of continuous periodic dynamic load can be captured. The purpose of adding harmless pigments to the permeate fluid 11 is to identify and clearly observe the movement of the permeate fluid 11 within the test specimen 5.
S140: the permeation fluid 11 flowing out of the sample 5 to be measured is obtained, and the permeability of the sample 5 to be measured is calculated.
The permeability of the sample 5 to be tested under dynamic load disturbance can be solved by the amount of liquid in the liquid collector 83 and the darcy rhythm.
The permeability shows the change rule of the sample 5 to be tested under the dynamic load disturbance from the macroscopic angle, and the change rule of the sample 5 to be tested under the dynamic load disturbance is shown from the microscopic angle through the migration path of the osmotic fluid 11 in the sample 5 to be tested shot by the high-speed camera 10, so that the change rule and the change rule are mutually verified.
Further, fig. 4 and 5 show the significant change in the condition of the osmotic fluid 11 under dynamic load disturbances. In fig. 5, the osmotic fluid 11 is attached to the surface of the scaffold and flows slowly under static loading. After the axial cyclic loading, the fluid overcomes the surface tension and gradually breaks free of the matrix, thereby flowing rapidly through the pores 55, macroscopically as a significant increase in permeability.
Similarly, FIG. 5 shows another variation of the osmotic fluid 11 under dynamic loading in a microscopic assay, in which the application of dynamic loading causes the originally agglomerated osmotic fluid 11 in the pores 55 to separate, form smaller units of osmotic fluid 11 and attach to the scaffold. In this case, the fluidity of the osmotic fluid 11 becomes relatively sluggish, showing a decrease in permeability on a macroscopic scale.
By capturing and shooting a part of the sample by the high-speed camera 10, a significant change in the fluid state can be obtained. It should be noted that the application of fluids with different viscosities, different load types (static load, dynamic and static combined load) and different dynamic parameters (such as frequency, amplitude, etc.) all show different effects.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The test device for simulating rock seepage is characterized by comprising a sample frame and an image collector, wherein the sample frame is used for placing a sample to be tested, the sample frame is connected with a loading assembly, the loading assembly is connected with a servo pump set, the servo pump set applies a dynamic load to the sample to be tested through the loading assembly and injects seepage fluid into the sample to be tested, the sample to be tested is communicated with a liquid collector, the liquid collector collects the seepage fluid flowing out of the sample to be tested, and the image collector faces the sample to be tested and is used for collecting images of migration paths of the seepage fluid in the sample to be tested.
2. The test device for simulating rock seepage according to claim 1, wherein the servo pump group comprises a hydraulic pump and an axial pressure pump, the hydraulic pump is used for injecting seepage fluid into the sample to be tested, and the axial pressure pump is used for applying dynamic load to the sample to be tested.
3. The test device for simulating rock seepage according to claim 2, wherein the loading assembly comprises a reaction plate, a pressure head and a piston, the pressure head and the piston are connected with the reaction plate, the reaction plate and the piston are respectively arranged at two opposite ends of the sample rack, the pressure head is correspondingly positioned at one end close to the sample to be tested, the axial pressure pump is communicated with the piston so as to apply dynamic load to the sample to be tested through the piston, and the hydraulic pump is communicated with the pressure head so as to inject seepage fluid into the sample to be tested through the pressure head.
4. The device of claim 3, wherein the hydraulic pump is in communication with the head via a fluid line.
5. A test rig for simulating rock seepage according to claim 3, wherein the hydraulic pump communicates with the piston through a first axial pressure passage and a second axial pressure passage, respectively.
6. The test device for simulating rock seepage according to claim 3, wherein the sample holder comprises two support columns arranged oppositely and a base positioned between the two support columns, and the base is connected with the piston.
7. The test device for simulating rock seepage of claim 1, wherein the image collector is a high-speed camera.
8. A test method for simulating rock permeability, using a test apparatus for simulating rock permeability according to any one of claims 1 to 7, the method comprising:
preparing and installing a sample to be tested;
applying a dynamic load to the sample to be tested;
injecting a penetrating fluid into the sample to be tested;
acquiring a migration path of a permeation fluid in a sample to be detected;
and acquiring the osmotic fluid flowing out of the sample to be tested, and calculating the permeability of the sample to be tested.
9. The method of claim 8, wherein the applying a dynamic load to the sample to be tested comprises:
applying a pre-tightening load to the sample to be tested to enable one end of the sample to be tested to be abutted against the loading assembly so as to pre-tighten the sample to be tested;
and applying a dynamic load to the sample to be tested.
10. The test method for simulating rock seepage according to claim 8, wherein the sample to be tested comprises a shell, the shell is provided with two openings which are oppositely arranged and are used for enabling the seepage fluid to flow in and out respectively, a framework is arranged in the shell and comprises a plurality of monomers which are arranged in parallel, a gap is arranged between every two adjacent monomers, a transparent cover plate is arranged on one surface of the shell, and an image collector faces the transparent cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010708802.3A CN111693441A (en) | 2020-07-22 | 2020-07-22 | Test device and test method for simulating rock seepage |
Applications Claiming Priority (1)
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| CN115420464A (en) * | 2022-11-07 | 2022-12-02 | 西南交通大学 | Underground engineering fluid pressure simulation system, method and related equipment |
| CN116380747A (en) * | 2023-04-18 | 2023-07-04 | 河海大学 | Device for visually simulating and measuring sand seepage characteristics by utilizing tracing image velocimetry technology |
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| CN116380747A (en) * | 2023-04-18 | 2023-07-04 | 河海大学 | Device for visually simulating and measuring sand seepage characteristics by utilizing tracing image velocimetry technology |
| CN116380747B (en) * | 2023-04-18 | 2024-08-27 | 河海大学 | Device for visually simulating and measuring sand seepage characteristics by utilizing tracing image velocimetry technology |
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