CN114878434B - Single-crack grouting seepage visualization test method with variable width and roughness - Google Patents
Single-crack grouting seepage visualization test method with variable width and roughness Download PDFInfo
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- CN114878434B CN114878434B CN202210549618.8A CN202210549618A CN114878434B CN 114878434 B CN114878434 B CN 114878434B CN 202210549618 A CN202210549618 A CN 202210549618A CN 114878434 B CN114878434 B CN 114878434B
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- 238000012800 visualization Methods 0.000 title claims abstract description 14
- 238000010998 test method Methods 0.000 title claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 170
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- 238000002347 injection Methods 0.000 claims abstract description 100
- 239000007924 injection Substances 0.000 claims abstract description 100
- 238000012360 testing method Methods 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 43
- 230000008569 process Effects 0.000 claims abstract description 37
- 230000000007 visual effect Effects 0.000 claims abstract description 32
- 230000005012 migration Effects 0.000 claims abstract description 17
- 238000013508 migration Methods 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 62
- 229910000831 Steel Inorganic materials 0.000 claims description 45
- 239000010959 steel Substances 0.000 claims description 45
- 239000007788 liquid Substances 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 27
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 238000005070 sampling Methods 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 239000011440 grout Substances 0.000 claims description 8
- 239000003381 stabilizer Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 230000008021 deposition Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000011435 rock Substances 0.000 abstract description 13
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 description 8
- 238000000151 deposition Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 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
- 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
A single-crack grouting seepage visualization test method with variable width and roughness specifically comprises the following steps: designing a visual test system for simulating multi-type single-fracture grouting seepage, which comprises a water injection device, a constant-pressure gas injection device, a slurry tank, a visual single-fracture seepage device, a rotary bearing device and a computer; (II) adding the slurry configured according to the requirement into a slurry tank; thirdly, building a visual single-crack seepage device on the rotary bearing device according to test requirements; fourthly, adjusting the inclination angle of the visual single-crack seepage device; fifthly, injecting the slurry into a visual single-fracture seepage device, and observing and researching the migration process of the slurry; and sixthly, cleaning the whole system after the test is completed. The invention can truly and accurately simulate the migration and evolution process of slurry in the rock stratum fracture, more intuitively observe the whole process of grouting filling the fracture, and provide a platform for researching the mechanism of grouting plugging the rock stratum fracture.
Description
Technical Field
The invention relates to the technical field of engineering fluid mechanics tests, in particular to a single-crack grouting seepage visualization test method with variable width and roughness.
Background
In mineral engineering, especially in coal mining, under the mining stress of a mining coal seam, even under the superposition stress of multi-seam mining, the problems of meeting dynamic disasters such as mine pressure, gas, water burst and the like are often caused. And grouting has the functions of filling, reinforcing and reducing seepage. Through carrying out high-pressure grouting to the broken rock body in the overlying strata of the coal seam, the crack in the stratum, the hole are filled with grouting, form comparatively firm "key layer", on the one hand can separate harmful gas, rivers etc. from above the stratum, on the other hand can fill the rock crack from the microcosmic aspect to improve the intensity and the stability of stratum, reduce the working resistance of below support, realize the long-term stability of tunnel.
However, in the current construction, the development state of the rock stratum fracture, the selection of grouting raw materials and the proportion of slurry can greatly influence the grouting effect in the actual engineering, the grouting carelessly can further aggravate the development of the rock stratum fracture, and the mine collapse is possibly caused, the whole process simulation of the fracture grouting in the rock stratum is difficult to realize in the prior art, the operation evolution rule of the slurry in the fracture cannot be comprehensively explored, and the obtained data lacks scientificity and accuracy.
Disclosure of Invention
The invention aims to provide a single-crack grouting seepage visualization test method with variable width and roughness, which can truly and accurately simulate the migration and evolution process of slurry in a rock stratum crack, and the test result is closer to the actual engineering than the numerical simulation, so that people can more intuitively observe the whole process of grouting and filling cracks, and a research platform is provided for researching the crack plugging mechanism of a grouting rock stratum.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a single-crack grouting seepage visualization test method with variable width and roughness specifically comprises the following steps:
the visual test system for simulating multi-type single-slit grouting seepage is designed, and comprises a water injection device, a constant-pressure gas injection device, a slurry tank, a visual single-slit seepage device, a rotary bearing device and a computer, wherein the top of the slurry tank is provided with a water injection port and a gas injection port, the upper side part of the outer side wall of the slurry tank is provided with a slurry filling port with a sealing cover, the bottom of the slurry tank is provided with a slurry outlet, a water outlet of the water injection device is connected with the water injection port of the slurry tank through a water injection pipe, a gas outlet of the constant-pressure gas injection device is connected with the gas injection port of the slurry tank through a gas injection pipe, a stirring device is arranged in the slurry tank, the slurry outlet of the slurry tank is connected with the grouting port of the visual single-slit seepage device through a slurry injection pipe, and a slurry valve, a slurry flowmeter and a slurry pressure meter are sequentially arranged on the slurry pipe along the liquid flow direction, and the computer is respectively connected with the visual single-slit seepage device, the slurry flowmeter and the slurry pressure meter through signals;
secondly, adding the slurry prepared according to the requirements into a slurry tank, and uniformly stirring through a stirring device;
thirdly, building a visual single-crack seepage device on the rotary bearing device according to test requirements;
fourthly, adjusting the inclination angle of the visual single-crack seepage device by rotating the bearing device;
fifthly, injecting air into the slurry tank through the constant-pressure air injection device, so that the slurry in the slurry tank is injected into the visual single-crack seepage device, and observing and researching the migration process of the slurry;
and sixthly, after the test is finished, the whole system is cleaned through the water injection device and the constant-pressure gas injection device, so that the next test is facilitated.
The water injection device comprises a water tank, a water injection pump, a liquid flowmeter and a liquid pressure regulating valve, wherein a water outlet of the water tank is connected with a water inlet of the water injection pump through a water pumping pipe, a water outlet of the water injection pump is connected with a water injection port of the slurry tank through a water injection pipe, the liquid flowmeter and the liquid pressure regulating valve are sequentially arranged on the water injection pipe along the liquid flowing direction, and the computer is respectively connected with the liquid flowmeter and the liquid pressure regulating valve through signals.
The constant-pressure gas injection device comprises a gas pump, a voltage stabilizer, a gas flowmeter and a gas pressure regulating valve, wherein a gas outlet of the gas pump is connected with a gas injection port of the slurry tank through a gas injection pipe, the voltage stabilizer, the gas flowmeter and the gas pressure regulating valve are sequentially arranged on the gas injection pipe along the gas flowing direction, and the computer is respectively connected with the gas flowmeter and the gas pressure regulating valve through signals.
The visualized single-slit seepage device comprises an acrylic cuboid block and a plurality of acrylic strip plates, wherein the acrylic cuboid block is horizontally arranged along the left-right direction, a left-right transparent cuboid slit channel is formed in the middle of the acrylic cuboid block along the left-right direction, a left-end front side part and a rear side part of the inner upper surface and lower surface of the cuboid slit channel and a right-end front side part and rear side part of the inner upper surface and lower surface of the cuboid slit channel are uniformly formed with a plurality of clamping strips which are arranged at intervals in the front-back direction, each clamping strip at the front side and each clamping strip at the rear side are respectively and symmetrically arranged in the front-back direction in a one-to-one correspondence mode, clamping grooves for inserting acrylic strip plates are formed between every two adjacent clamping strips, the height of the acrylic strip plates is the same as that of the cuboid slit channel, each acrylic strip plate is vertically and correspondingly inserted into each corresponding clamping groove in the cuboid channel along the left-right direction, a plurality of first through holes which are arranged at intervals in the left-right direction and are communicated with the cuboid slit channel are formed in the middle of the inner surface of the cuboid slit channel, each clamping strip is respectively, a screw grouting screw is connected with a screw sensor at the left-side of a screw sensor, a screw sensor is connected with a screw sensor, and a slurry outlet is connected to a slurry outlet, and a slurry outlet is respectively.
The rotary bearing device comprises a rectangular steel frame, a bearing table and a rotary disk, wherein the rectangular steel frame is horizontally arranged, the rectangular steel frame is formed by welding four square steel pipes in an end-to-end mode, the periphery of the bottom of the rectangular steel frame is fixedly supported on the ground through a stand column, the bearing table is horizontally arranged in the rectangular steel frame, the bearing table is made of steel plates, the middle part of the front side edge and the middle part of the rear side edge of the bearing table are both connected with rotary shafts horizontally arranged along the front-back direction, the rotary shafts on the front side are rotationally connected to the front side steel pipes of the rectangular steel frame, the rotary shafts on the rear side are rotationally connected to the rear side steel pipes of the rectangular steel frame, the front ends of the rotary shafts on the front side penetrate through the front side steel pipes of the rectangular steel frame, the rotary disk is vertically arranged along the left-right direction, the center of the rear side surface of the rotary disk is fixedly connected to the front ends of the rotary shafts on the front side, the front side surfaces of the rotary disk are carved with angle scale marks, the rotary disk is provided with a plurality of angle positioning holes arranged in a circumferential array, the central angle between two adjacent angle positioning holes is the same as the unit angle of the angle scale marks, the front side steel pipe of the rectangular steel frame is provided with two bolt holes which are arranged at intervals in a front-back penetrating way, the left bolt hole corresponds to the left positioning hole in a left-right way, the right bolt hole corresponds to the right positioning hole in a left-right way, the left positioning holes and the right positioning holes are respectively inserted with positioning pins, the two positioning pins are respectively inserted into the two bolt holes in a corresponding way, the middle part of the bearing table is downwards concave into a cuboid groove with the same shape as the acrylic cuboid block, the acrylic cuboid block is embedded in the cuboid groove, the middle part of the bottom of the cuboid groove is provided with a plurality of second through holes which correspond to the first through holes in an up-down one-to-one way, each screw interface respectively passes through each second through hole in a one-to-one correspondence.
The second step is specifically as follows: and opening the sealing cover, adding the slurry configured according to the requirement into the slurry tank through the slurry filling inlet, starting the stirring device to stir the slurry to prevent slurry deposition, starting the air pump, and setting the gas injection pressure to be higher than the required grouting pressure through the gas pressure regulating valve.
The step (III) is specifically as follows: according to the crack width required by the test, a corresponding number of acrylic long strips are selected, according to the crack roughness required by the test, a plurality of alloy sheets which are spaced left and right are stuck to one side surface of the corresponding acrylic long strips, equidistant protrusions can be formed for simulating rough cracks, alloy sheets with different thicknesses can simulate cracks with different roughness, then the selected acrylic long strips are sequentially inserted into corresponding clamping grooves which correspond left and right in the rectangular crack channel from front and back sides of the rectangular crack channel in a middle arrangement mode, so that the crack required by the test is formed, wherein one side surface of the acrylic long strips stuck with the alloy sheets is used as the side surface of the crack, then the left end and the right end of a rectangular piece of acrylic are respectively wrapped with rubber films for sealing the left end and the right end of the rectangular crack channel, the acrylic rectangular piece is embedded in a rectangular groove in the middle of a bearing table, all screw interfaces respectively pass through second through holes in a one-to-one correspondence mode, then the screw interfaces at the leftmost side are connected with a grout discharge valve, and the screw interfaces at the rightmost side are connected with grout outlet of a grout pouring tank through a middle grout pipe to form the screw joint or a sampling valve according to the requirements of the test.
The step (IV) is specifically as follows: rotating the rotary disk to a required angle, enabling the bearing plate to drive the acrylic cuboid block to rotate and adjust to the required angle, and then using two positioning pins to be respectively inserted into the left positioning holes and the right positioning holes, so that the two positioning pins are respectively correspondingly inserted into the two bolt holes, and fixing the rotary disk, so that crack seepage tests under different inclination angles can be conducted.
The step (V) is specifically as follows: the grouting valve and the slurry discharging valve are opened, the slurry in the slurry tank is injected into the crack in the acrylic cuboid block through the grouting pipe under the action of the grouting pressure, the slurry is permeated and moved in the crack from right to left, the slurry is discharged from the crack through the slurry discharging valve, so that the slurry moving process can be observed, if the pressure of the slurry in the seepage and moving process is required to be measured, each screw interface in the middle is connected with a pressure sensor, a computer is respectively connected with each pressure sensor, each pressure sensor can monitor the pressure value of the slurry in the seepage and moving process in real time, meanwhile, the slurry flowmeter monitors the flow of the slurry in real time, the computer analyzes the pressure value and the flow of the slurry in the seepage and moving process, and then measures the pressure change rule of the slurry in the seepage and moving process, if the slurry is required to be sampled, the sampling valve is connected with each screw interface in the middle, and the sampling valve is required to be sampled through the sampling valve, wherein the pressure in the slurry tank can be stably kept at the set air pressure in the grouting process through the pressure stabilizer and the gas so as to realize the pressure test function.
The step (six) is specifically as follows: after the test is finished, the grouting valve and the air pump are closed, the water injection pump is started, a certain amount of clear water is injected into the slurry tank through the water injection pipe by the water injection pump, then the water injection pump is closed, the stirring device stirs the clear water to clean the interior of the slurry tank, then the grouting valve and the air pump are opened, clear water in the slurry tank is injected into cracks in the acrylic cuboid block through the grouting pipe and is completely discharged through the slurry discharge valve, meanwhile, the air pump also completely blows out residual clear water in the grouting pipe, slurry components in the next grouting test are prevented from being influenced, the clear water can clean the grouting pipe and the inside of the cracks in the next grouting test in the grouting pipe and the crack, then the grouting valve and the air pump are closed again, the water injection pump is started, the water in the water tank is injected into the slurry tank through the water injection pipe, then the water injection pump is closed, the stirring device stirs the interior of the slurry tank to clean the interior of the slurry tank, and then the grouting valve and the air pump are opened, the clear water in the acrylic cuboid block is injected into the cracks in the grouting pipe and is discharged through the slurry discharge valve, and the residual clear water in the grouting pipe is completely blown out, the slurry components in the next grouting pipe can be prevented from being influenced by the whole grouting pipe and the whole grouting system in the next grouting test, and the next grouting test is avoided, and the whole grouting components in the next grouting test can be conveniently cleaned, and the whole grouting operation in the next time is repeated, and the next-step in the next grouting test is avoided.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly has the following beneficial effects:
(1) The invention can realize the visual detection of the whole process of dynamic migration of the slurry in the crack grouting process under different widths and different roughness, thereby exploring and analyzing the migration evolution rule of the slurry in cracks under different working conditions and obtaining a large amount of grouting seepage simulation test data;
(2) The coagulation and deposition rules of different materials and different proportions of slurry in the flowing process can be researched, and effective and reliable parameters can be provided for numerical simulation of the engineering problems;
(3) The invention can truly and accurately simulate the migration and evolution process of slurry in the rock stratum fracture, the test result is closer to the actual engineering than the numerical simulation, and people can more intuitively observe the whole process of grouting and filling the fracture, thereby providing a platform for researching the mechanism of grouting and plugging the rock stratum fracture.
Drawings
FIG. 1 is a schematic diagram of a simulated multi-type single fracture grouting seepage visualization test system of the present invention.
FIG. 2 is an isometric schematic view of a visual single-slit seepage apparatus of the present invention.
FIG. 3 is a schematic bottom view of a visual single-slit infiltration apparatus of the present invention.
Fig. 4 is a left side view of a visual single-slit seepage apparatus of the present invention.
Fig. 5 is a schematic structural view of an acrylic strip plate to which no gold plate is attached according to the present invention.
Fig. 6 is a schematic structural view of an acrylic strip plate with an alloy sheet attached thereto according to the present invention.
Fig. 7 is a front view of the rotary carrier of the present invention.
Fig. 8 is a top view of the assembly of the rotary carrier device and the acrylic cuboid block of the present invention.
Fig. 9 is a cross-sectional view taken along A-A in fig. 8.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
As shown in fig. 1-9, a single-crack grouting seepage visualization test method with variable width and roughness specifically comprises the following steps:
firstly, designing a visual test system for simulating multi-type single-slit grouting seepage, wherein the visual test system for simulating multi-type single-slit grouting seepage comprises a water injection device, a constant-pressure gas injection device, a slurry tank 1, a visual single-slit seepage device 37, a rotary bearing device and a computer 2, wherein the top of the slurry tank 1 is provided with a water injection port 3 and a gas injection port 4, the upper side part of the outer side wall of the slurry tank 1 is provided with a slurry filling port 5 with a sealing cover, the bottom of the slurry tank 1 is provided with a slurry outlet 6, the water outlet of the water injection device is connected with the water injection port 3 of the slurry tank 1 through a water injection pipe 7, the gas outlet of the constant-pressure gas injection device is connected with the gas injection port 4 of the slurry tank 1 through a gas injection pipe 8, the slurry tank 1 is internally provided with a stirring device 9, the visual single-slit seepage device 37 is arranged on the rotary bearing device, the slurry outlet 6 of the slurry tank 1 is connected with the grouting port of the visual single-slit seepage device 37 through a slurry injection pipe 10, and the grouting valve 11, a slurry flowmeter 12 and a grouting pressure meter 13 are sequentially arranged on the grouting pipe 10 along the liquid flow direction, and the grouting pressure meter 13 are respectively connected with the visual single-slit pressure meter and the signal flow meter 13;
secondly, adding the slurry which is configured according to the requirements into a slurry tank 1, and uniformly stirring through a stirring device 9;
thirdly, building a visual single-crack seepage device 37 on the rotary bearing device according to test requirements;
fourthly, adjusting the inclination angle of the visualized single-crack seepage device 37 by rotating the bearing device;
fifthly, injecting air into the slurry tank 1 through the constant-pressure air injection device, so that the slurry in the slurry tank 1 is injected into the visual single-crack seepage device 37, and observing and researching the migration process of the slurry;
and sixthly, after the test is finished, the whole system is cleaned through the water injection device and the constant-pressure gas injection device, so that the next test is facilitated.
The water injection device comprises a water tank 14, a water injection pump 15, a liquid flowmeter 16 and a liquid pressure regulating valve 17, wherein a water outlet of the water tank 14 is connected with a water inlet of the water injection pump 15 through a water pumping pipe 18, a water outlet of the water injection pump 15 is connected with a water injection port 3 of the slurry tank 1 through a water injection pipe 7, the liquid flowmeter 16 and the liquid pressure regulating valve 17 are sequentially arranged on the water injection pipe 7 along the liquid flowing direction, and the computer 2 is respectively connected with the liquid flowmeter 16 and the liquid pressure regulating valve 17 through signals.
The constant-pressure gas injection device comprises a gas pump 19, a pressure stabilizer 20, a gas flowmeter 21 and a gas pressure regulating valve 22, wherein a gas outlet of the gas pump 19 is connected with a gas injection port 4 of the slurry tank 1 through a gas injection pipe 8, the pressure stabilizer 20, the gas flowmeter 21 and the gas pressure regulating valve 22 are sequentially arranged on the gas injection pipe 8 along the gas flow direction, and the computer 2 is respectively in signal connection with the gas flowmeter 21 and the gas pressure regulating valve 22.
The visualized single-slit seepage device 37 comprises an acrylic cuboid block 23 and a plurality of acrylic long strips 24, wherein the acrylic cuboid block 23 is horizontally arranged along the left-right direction, a left-right transparent cuboid slit channel 25 is arranged in the middle of the acrylic cuboid block 23 along the left-right direction, a left-end front side part and a rear side part of the inner upper surface and the lower surface of the cuboid slit channel 25 and a right-end front side part and a rear side part of the inner upper surface and the lower surface of the cuboid slit channel 25 are uniformly formed and provided with a plurality of clamping strips 26 which are arranged at intervals from front to back, each clamping strip 26 at the front side and each clamping strip 26 at the rear side are respectively and symmetrically arranged from front to back in a one-to-one correspondence manner, clamping grooves for inserting the acrylic long strips 24 are formed between two adjacent clamping strips 26, the height of the acrylic strip plates 24 is the same as that of the cuboid crack channels 25, each acrylic strip plate 24 is vertically and correspondingly inserted into corresponding clamping grooves in the cuboid crack channels 25 along the left-right direction, a plurality of first through holes 27 which are arranged at intervals left and right and are communicated with the cuboid crack channels 25 are formed in the middle of the lower surface of each acrylic strip plate 23, screw connectors are mounted at the positions of the first through holes 27, the leftmost screw connectors are connected with slurry discharging valves, the rightmost screw connectors are connected with slurry outlets 6 of the slurry tank 1 through grouting pipes 10, sampling valves or pressure sensors are connected with the screw connectors in the middle, and the computer 2 is connected with the pressure sensors in a signal mode.
The rotary bearing device comprises a rectangular steel frame 28, a bearing table 29 and a rotary disk 30, wherein the rectangular steel frame 28 is horizontally arranged, the rectangular steel frame 28 is formed by welding four square steel pipes end to end, the periphery of the bottom of the rectangular steel frame 28 is fixedly supported on the ground through a stand column 31, the bearing table 29 is horizontally arranged in the rectangular steel frame 28, the bearing table 29 is a steel plate, the middle part of the front side edge and the middle part of the rear side edge of the bearing table 29 are both connected with rotating shafts 32 horizontally arranged along the front-rear direction, the rotating shafts 32 on the front side are rotationally connected to the front side steel pipes of the rectangular steel frame 28, the rotating shafts 32 on the rear side are rotationally connected to the rear side steel pipes of the rectangular steel frame 28, the front ends of the rotating shafts 32 on the front side penetrate through the front side steel pipes of the rectangular steel frame 28, the rotary disk 30 is vertically arranged along the left-right direction, the center of the rear side surface of the rotary disk 30 is fixedly connected to the front ends of the rotating shafts 32 on the front side, the front side of the rotary disk 30 is carved with angle scale marks 33, the rotary disk 30 is provided with a plurality of angle positioning holes 34 arranged in a circumferential array, the central angle between two adjacent angle positioning holes 34 is the same as the unit angle of the angle scale marks 33, the front side steel pipe of the rectangular steel frame 28 is provided with two bolt holes which are arranged at intervals left and right and are transparent from front to back, the bolt hole on the left side corresponds to the left positioning hole left and right, the bolt hole on the right corresponds to the right positioning hole left and right, the positioning holes on the left side and right are respectively inserted with a positioning pin 35, the two positioning pins 35 are respectively inserted into the two bolt holes correspondingly, the middle part of the bearing table 29 is downwards concavely integrated into a cuboid groove with the same shape as the acrylic cuboid block 23, the acrylic cuboid block 23 is embedded in the cuboid groove, a plurality of second through holes 36 which are in up-down one-to-one correspondence with the first through holes 27 are formed in the middle of the bottom of the rectangular groove, and the screw interfaces respectively pass through the second through holes 36 in one-to-one correspondence.
The second step is specifically as follows: the sealing cover is opened, the slurry configured according to the requirement is added into the slurry tank 1 through the slurry filling inlet 5, the stirring device 9 is started to stir the slurry to prevent the slurry from depositing, the air pump 19 is started, and the gas injection pressure is set to be higher than the required grouting pressure through the gas pressure regulating valve 22.
The step (III) is specifically as follows: according to the crack width required by the test, a corresponding number of acrylic long strips 24 are selected, according to the crack roughness required by the test, a plurality of alloy sheets 38 which are spaced left and right are stuck on one side surface of the corresponding acrylic long strips 24, equidistant protrusions can be formed for simulating rough cracks, the alloy sheets 38 with different thicknesses can simulate cracks with different roughness, then the selected acrylic long strips 24 are sequentially inserted into corresponding clamping grooves which correspond left and right in the rectangular crack channel 25 from front and back sides of the rectangular crack channel 25 in a middle arrangement mode, so as to form the crack required by the test, wherein one side surface of the acrylic long strips 24 stuck with the alloy sheets 38 is used as the side surface of the crack, then the left end and the right end of the acrylic rectangular block 23 are wrapped with rubber films for sealing the left end and the right end of the rectangular crack channel 25, then the acrylic rectangular block 23 is embedded in a rectangular groove which is placed in the middle of the bearing table 29, each screw interface is respectively penetrated downwards in a one-to-one correspondence manner, then the screw interface at the leftmost side is connected with the screw interface, and the grouting valve at the left side is connected with the grouting valve 10 through the grouting valve 1, and the grouting valve is connected with the grouting valve 10 according to the requirement of the grouting valve 1.
The step (IV) is specifically as follows: rotating the rotating disc 30 to a required angle, the bearing plate drives the acrylic cuboid block 23 to rotate to a required angle, and then two positioning pins 35 are respectively inserted into the left and right positioning holes, so that the two positioning pins 35 are respectively inserted into the two bolt holes correspondingly, and the rotating disc 30 is fixed, so that crack seepage tests under different inclination angles can be carried out.
The step (V) is specifically as follows: the grouting valve 11 and the grouting valve are opened, the grouting liquid in the grouting liquid tank 1 is injected into the crack in the acrylic cuboid block 23 through the grouting pipe 10 under the action of grouting pressure, the grouting liquid is carried out seepage migration in the crack from right to left, the grouting liquid is discharged from the crack through the grouting valve, so that the migration process of the grouting liquid can be observed, if the pressure of the grouting liquid in the seepage migration process is required to be measured, each screw interface in the middle is connected with a pressure sensor, the computer 2 is respectively connected with each pressure sensor through signals, each pressure sensor can monitor the pressure value of the grouting liquid in the seepage migration process in real time, meanwhile, the grouting liquid flowmeter 12 monitors the flow of the grouting liquid in real time, the computer 2 analyzes the pressure value and the flow of the grouting liquid in the seepage migration process, the pressure change rule of the grouting liquid is measured, if the grouting liquid is required to be sampled, each screw interface in the middle is connected with the sampling valve, the pressure sensor is required to be sampled through the sampling valve, and the pressure in the grouting liquid tank 1 can be kept stable at the set constant pressure in the grouting liquid process through the pressure regulator 20 and the gas pressure regulating valve 22, and thus the grouting liquid can be tested.
The step (six) is specifically as follows: after the test is completed, the grouting valve 11 and the air pump 19 are closed, the water injection pump 15 is started, the water injection pump 15 injects a certain amount of clean water into the slurry tank 1 through the water injection pipe 7, then the water injection pump 15 is closed, the stirring device 9 stirs the clean water to clean the inside of the slurry tank 1, then the grouting valve 11 and the air pump 19 are opened, the clean water in the slurry tank 1 is injected into the cracks in the acrylic cuboid block 23 through the grouting pipe 10 and is completely discharged through the discharge valve, meanwhile, the air pump 19 also completely blows out the residual clean water in the grouting pipe 10, so that the slurry components in the next grouting test are prevented from being influenced, the clean water can clean the inside of the grouting pipe 10 and the cracks in the grouting pipe 10 in the process, then the grouting valve 11 and the air pump 19 are closed, the water injection pump 15 is started, the water in the water tank 14 is injected into the slurry tank 1 through the water injection pipe 7 by a certain amount, then the stirring device 9 is closed, the inside of the slurry tank 1 is cleaned, the clean water in the grouting pipe 11 and the air pump 19 is further opened, the slurry in the crack 11 and the crack 1 are completely discharged through the discharge valve, the grouting pipe 10 is simultaneously, the residual clean water in the grouting pipe 10 is prevented from being influenced by the whole grouting pipe 10 and the whole grouting pipe 10 in the next grouting test, and the whole grouting system is simultaneously, and the residual water in the next grouting pipe is prevented from being repeatedly discharged in the grouting test is simultaneously, and the grouting system in the next grouting test is simultaneously.
The sealing cover, the screw interface, the slurry discharging valve, the sampling valve, the pressure sensor and the bolt hole are not shown in the figure, the stirring device 9 is the prior art, and the specific structure and the working principle are not repeated.
The maximum width of the slit required by the test is a cuboid slit channel 25 without the acrylic strip plate 24 inserted therein, and the width of the cavity in the cuboid slit channel 25 can be changed by inserting different amounts of the acrylic strip plates 24 therein, so that slits with different widths can be obtained.
The invention has the following beneficial effects:
(1) The invention can realize the visual detection of the whole process of dynamic migration of the slurry in the crack grouting process under different widths and different roughness, thereby exploring and analyzing the migration evolution rule of the slurry in cracks under different working conditions and obtaining a large amount of grouting seepage simulation test data;
(2) The coagulation and deposition rules of different materials and different proportions of slurry in the flowing process can be researched, and effective and reliable parameters can be provided for numerical simulation of the engineering problems;
(3) The invention can truly and accurately simulate the migration and evolution process of slurry in the rock stratum fracture, the test result is closer to the actual engineering than the numerical simulation, and people can more intuitively observe the whole process of grouting and filling the fracture, thereby providing a research platform for researching the grouting rock stratum fracture plugging mechanism.
The above embodiments are merely for illustrating the technical aspects of the present invention, and it should be understood by those skilled in the art that the present invention is described in detail with reference to the above embodiments; modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (6)
1. A single crack grouting seepage visualization test method with variable width and roughness is characterized by comprising the following steps of: the method specifically comprises the following steps:
the visual test system for simulating multi-type single-slit grouting seepage is designed, and comprises a water injection device, a constant-pressure gas injection device, a slurry tank, a visual single-slit seepage device, a rotary bearing device and a computer, wherein the top of the slurry tank is provided with a water injection port and a gas injection port, the upper side part of the outer side wall of the slurry tank is provided with a slurry filling port with a sealing cover, the bottom of the slurry tank is provided with a slurry outlet, a water outlet of the water injection device is connected with the water injection port of the slurry tank through a water injection pipe, a gas outlet of the constant-pressure gas injection device is connected with the gas injection port of the slurry tank through a gas injection pipe, a stirring device is arranged in the slurry tank, the slurry outlet of the slurry tank is connected with the grouting port of the visual single-slit seepage device through a slurry injection pipe, and a slurry valve, a slurry flowmeter and a slurry pressure meter are sequentially arranged on the slurry pipe along the liquid flow direction, and the computer is respectively connected with the visual single-slit seepage device, the slurry flowmeter and the slurry pressure meter through signals;
secondly, adding the slurry prepared according to the requirements into a slurry tank, and uniformly stirring through a stirring device;
thirdly, building a visual single-crack seepage device on the rotary bearing device according to test requirements;
fourthly, adjusting the inclination angle of the visual single-crack seepage device by rotating the bearing device;
fifthly, injecting air into the slurry tank through the constant-pressure air injection device, so that the slurry in the slurry tank is injected into the visual single-crack seepage device, and observing and researching the migration process of the slurry;
sixthly, after the test is finished, cleaning the whole system through the water injection device and the constant-pressure gas injection device, so that the next test is facilitated;
the water injection device comprises a water tank, a water injection pump, a liquid flowmeter and a liquid pressure regulating valve, wherein a water outlet of the water tank is connected with a water inlet of the water injection pump through a water pumping pipe, a water outlet of the water injection pump is connected with a water injection port of the slurry tank through a water injection pipe, the liquid flowmeter and the liquid pressure regulating valve are sequentially arranged on the water injection pipe along the liquid flowing direction, and the computer is respectively connected with the liquid flowmeter and the liquid pressure regulating valve through signals;
the constant-pressure gas injection device comprises a gas pump, a voltage stabilizer, a gas flowmeter and a gas pressure regulating valve, wherein a gas outlet of the gas pump is connected with a gas injection port of the slurry tank through a gas injection pipe, the voltage stabilizer, the gas flowmeter and the gas pressure regulating valve are sequentially arranged on the gas injection pipe along the gas flowing direction, and the computer is respectively connected with the gas flowmeter and the gas pressure regulating valve through signals;
the visualized single-slit seepage device comprises an acrylic cuboid block and a plurality of acrylic strip plates, wherein the acrylic cuboid block is horizontally arranged along the left-right direction, a left-right transparent cuboid slit channel is formed in the middle of the acrylic cuboid block along the left-right direction, a left-end front side part and a rear side part of the inner upper surface and lower surface of the cuboid slit channel and a right-end front side part and a rear side part of the inner upper surface and lower surface of the cuboid slit channel are uniformly formed and provided with a plurality of clamping strips which are arranged at intervals in the front-back direction, each clamping strip at the front side and each clamping strip at the rear side are respectively and symmetrically arranged in the front-back direction in a one-to-one correspondence manner, clamping grooves for inserting the acrylic strip plates are formed between two adjacent clamping strips, the height of the acrylic strip plates is the same as that of the cuboid slit channel, each acrylic strip plate is vertically and correspondingly inserted into corresponding clamping grooves in the cuboid channel along the left-right direction, a plurality of first through holes which are arranged at intervals in the left-right direction and are formed in the middle of the lower surface of the cuboid slit channel and are communicated with the cuboid slit channel, each clamping strip is respectively, each clamping strip is connected with a screw grouting screw, a screw outlet is connected with a screw outlet, and a screw outlet is respectively, and a slurry outlet is connected to a screw outlet;
the rotary bearing device comprises a rectangular steel frame, a bearing table and a rotary disk, wherein the rectangular steel frame is horizontally arranged, the rectangular steel frame is formed by welding four square steel pipes in an end-to-end mode, the periphery of the bottom of the rectangular steel frame is fixedly supported on the ground through a stand column, the bearing table is horizontally arranged in the rectangular steel frame, the bearing table is made of steel plates, the middle part of the front side edge and the middle part of the rear side edge of the bearing table are both connected with rotary shafts horizontally arranged along the front-back direction, the rotary shafts on the front side are rotationally connected to the front side steel pipes of the rectangular steel frame, the rotary shafts on the rear side are rotationally connected to the rear side steel pipes of the rectangular steel frame, the front ends of the rotary shafts on the front side penetrate through the front side steel pipes of the rectangular steel frame, the rotary disk is vertically arranged along the left-right direction, the center of the rear side surface of the rotary disk is fixedly connected to the front ends of the rotary shafts on the front side, the front side surfaces of the rotary disk are carved with angle scale marks, the rotary disk is provided with a plurality of angle positioning holes arranged in a circumferential array, the central angle between two adjacent angle positioning holes is the same as the unit angle of the angle scale marks, the front side steel pipe of the rectangular steel frame is provided with two bolt holes which are arranged at intervals in a front-back penetrating way, the left bolt hole corresponds to the left positioning hole in a left-right way, the right bolt hole corresponds to the right positioning hole in a left-right way, the left positioning holes and the right positioning holes are respectively inserted with positioning pins, the two positioning pins are respectively inserted into the two bolt holes in a corresponding way, the middle part of the bearing table is downwards concave into a cuboid groove with the same shape as the acrylic cuboid block, the acrylic cuboid block is embedded in the cuboid groove, the middle part of the bottom of the cuboid groove is provided with a plurality of second through holes which correspond to the first through holes in an up-down one-to-one way, each screw interface respectively passes through each second through hole in a one-to-one correspondence.
2. The single-fracture grouting seepage visualization test method with variable width and roughness according to claim 1, wherein the method comprises the following steps: the second step is specifically as follows: and opening the sealing cover, adding the slurry configured according to the requirement into the slurry tank through the slurry filling inlet, starting the stirring device to stir the slurry to prevent slurry deposition, starting the air pump, and setting the gas injection pressure to be higher than the required grouting pressure through the gas pressure regulating valve.
3. The single-fracture grouting seepage visualization test method with variable width and roughness according to claim 1, wherein the method comprises the following steps: the step (III) is specifically as follows: according to the crack width required by the test, a corresponding number of acrylic long strips are selected, according to the crack roughness required by the test, a plurality of alloy sheets which are spaced left and right are stuck to one side surface of the corresponding acrylic long strips, equidistant protrusions can be formed for simulating rough cracks, alloy sheets with different thicknesses can simulate cracks with different roughness, then the selected acrylic long strips are sequentially inserted into corresponding clamping grooves which correspond left and right in the rectangular crack channel from front and back sides of the rectangular crack channel in a middle arrangement mode, so that the crack required by the test is formed, wherein one side surface of the acrylic long strips stuck with the alloy sheets is used as the side surface of the crack, then the left end and the right end of a rectangular piece of acrylic are respectively wrapped with rubber films for sealing the left end and the right end of the rectangular crack channel, the acrylic rectangular piece is embedded in a rectangular groove in the middle of a bearing table, all screw interfaces respectively pass through second through holes in a one-to-one correspondence mode, then the screw interfaces at the leftmost side are connected with a grout discharge valve, and the screw interfaces at the rightmost side are connected with grout outlet of a grout pouring tank through a middle grout pipe to form the screw joint or a sampling valve according to the requirements of the test.
4. The single-fracture grouting seepage visualization test method with variable width and roughness according to claim 1, wherein the method comprises the following steps: the step (IV) is specifically as follows: rotating the rotary disk to a required angle, enabling the bearing plate to drive the acrylic cuboid block to rotate and adjust to the required angle, and then using two positioning pins to be respectively inserted into the left positioning holes and the right positioning holes, so that the two positioning pins are respectively correspondingly inserted into the two bolt holes, and fixing the rotary disk, so that crack seepage tests under different inclination angles can be conducted.
5. The single-fracture grouting seepage visualization test method with variable width and roughness according to claim 1, wherein the method comprises the following steps: the step (V) is specifically as follows: the grouting valve and the slurry discharging valve are opened, the slurry in the slurry tank is injected into the crack in the acrylic cuboid block through the grouting pipe under the action of the grouting pressure, the slurry is permeated and moved in the crack from right to left, the slurry is discharged from the crack through the slurry discharging valve, so that the slurry moving process can be observed, if the pressure of the slurry in the seepage and moving process is required to be measured, each screw interface in the middle is connected with a pressure sensor, a computer is respectively connected with each pressure sensor, each pressure sensor can monitor the pressure value of the slurry in the seepage and moving process in real time, meanwhile, the slurry flowmeter monitors the flow of the slurry in real time, the computer analyzes the pressure value and the flow of the slurry in the seepage and moving process, and then measures the pressure change rule of the slurry in the seepage and moving process, if the slurry is required to be sampled, the sampling valve is connected with each screw interface in the middle, and the sampling valve is required to be sampled through the sampling valve, wherein the pressure in the slurry tank can be stably kept at the set air pressure in the grouting process through the pressure stabilizer and the gas so as to realize the pressure test function.
6. The single-fracture grouting seepage visualization test method with variable width and roughness according to claim 1, wherein the method comprises the following steps: the step (six) is specifically as follows: after the test is finished, the grouting valve and the air pump are closed, the water injection pump is started, a certain amount of clear water is injected into the slurry tank through the water injection pipe by the water injection pump, then the water injection pump is closed, the stirring device stirs the clear water to clean the interior of the slurry tank, then the grouting valve and the air pump are opened, clear water in the slurry tank is injected into cracks in the acrylic cuboid block through the grouting pipe and is completely discharged through the slurry discharge valve, meanwhile, the air pump also completely blows out residual clear water in the grouting pipe, slurry components in the next grouting test are prevented from being influenced, the clear water can clean the grouting pipe and the inside of the cracks in the next grouting test in the grouting pipe and the crack, then the grouting valve and the air pump are closed again, the water injection pump is started, the water in the water tank is injected into the slurry tank through the water injection pipe, then the water injection pump is closed, the stirring device stirs the interior of the slurry tank to clean the interior of the slurry tank, and then the grouting valve and the air pump are opened, the clear water in the acrylic cuboid block is injected into the cracks in the grouting pipe and is discharged through the slurry discharge valve, and the residual clear water in the grouting pipe is completely blown out, the slurry components in the next grouting pipe can be prevented from being influenced by the whole grouting pipe and the whole grouting system in the next grouting test, and the next grouting test is avoided, and the whole grouting components in the next grouting test can be conveniently cleaned, and the whole grouting operation in the next time is repeated, and the next-step in the next grouting test is avoided.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210549618.8A CN114878434B (en) | 2022-05-20 | 2022-05-20 | Single-crack grouting seepage visualization test method with variable width and roughness |
| SE2351091A SE2351091A1 (en) | 2022-05-20 | 2023-03-24 | Visualized test method which is for single fracture grouting seepage and in which width and roughness are variable |
| PCT/CN2023/083806 WO2023160725A1 (en) | 2022-05-20 | 2023-03-24 | Visualized test method which is for single fracture grouting seepage and in which width and roughness are variable |
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| CN202210549618.8A CN114878434B (en) | 2022-05-20 | 2022-05-20 | Single-crack grouting seepage visualization test method with variable width and roughness |
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| CN116539813B (en) * | 2023-05-25 | 2024-04-09 | 西南石油大学 | Wall roughness adjustable crack medium microorganism mineralization shutoff model device |
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| WO2023160725A1 (en) | 2023-08-31 |
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| WO2023160725A9 (en) | 2023-10-26 |
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