CN114487340A - Crack real-time visualization seepage erosion soil-water determination triaxial test device and method - Google Patents
Crack real-time visualization seepage erosion soil-water determination triaxial test device and method Download PDFInfo
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Abstract
The invention discloses a three-axis test device and a method for measuring seepage erosion soil and water in real time in a crack, which relate to the field of three-axis seepage devices and comprise an axial force control device, a base, a three-axis pressure chamber, a seepage collection device and a CT (computed tomography) scanning system; the axial force control device comprises a bracket, a vertical loading structure and a loading rod; the three-axis pressure chamber is respectively communicated with an oil pipeline and an oil outlet pipeline, and an upper porous plate, a lower porous plate, a rubber sleeve and a pressure cap are arranged in the three-axis pressure chamber; the seepage collecting device comprises a weighing mechanism, an upper separating cylinder, a lower separating cylinder, a permeable stone and a measuring cylinder; the CT scanning system comprises an X-ray source and a detector which are arranged on two sides of a triaxial pressure chamber. The device can realize the omnibearing real-time scanning imaging of the experimental seepage process, realize the triaxial seepage process under the action of gravity only with zero hydraulic gradient, better observe the change conditions of the particle outflow and the permeability coefficient in different time periods, improve the experimental precision and reduce the labor intensity.
Description
Technical Field
The invention relates to the field of triaxial seepage devices, in particular to a triaxial test device and a triaxial test method for measuring seepage erosion soil water in real time in a fracture visualization manner.
Background
The soil-rock mixture is usually composed of crushed stone aggregates with different particle sizes and soil, is a geological body frequently encountered in engineering construction, and is widely distributed in slope engineering, tunnel engineering and roadbed engineering. The particle size of 5mm is generally taken as a limit standard of soil and gravel, the mechanical property of the soil-rock mixture is obviously influenced by the stone content (P5), and the soil-rock mixture can be further divided into stone soil (P5< 25%), mixed soil (25% < P5< 70%) and soil-rock (P5> 70%) according to different stone contents. The soil-rock mixture has complex internal structure, so the physical and mechanical properties of the soil-rock mixture are still explored at present. Particularly, under the seepage action of rainfall or underground water level change and the like, the migration rule of the water and particles in the soil-rock mixture is complex, the current research fails to comprehensively disclose the fluid-solid coupling and seepage erosion action rule of the soil-rock mixture, and great trouble is brought to related engineering construction.
The existing research shows that the macroscopic permeability coefficient of the soil-rock mixture is gradually reduced along with the increase of the rock content, the included angle between the long axis of the block stone and the main seepage direction and the granularity fractal dimension; the hydraulic gradient and confining pressure have little influence on the characteristics of the soil-rock mixture such as strength, body edges and the like after seepage, but the seepage erosion resistance of the soil-rock mixture can be obviously improved by increasing the confining pressure; in addition, according to the previous research results, the earth and rock mixture generates flowing earth or pipeline flow under the influence of seepage, which is the main mode of damage. Therefore, the research on the pipeline distribution morphological characteristics of the soil-rock mixture seepage failure process under the influence of different confining pressure and seepage modes plays an important role in further understanding the soil-rock mixture seepage failure mechanism and the intensity change rule.
Although the existing triaxial seepage device can complete the seepage test under specific conditions, the existing triaxial seepage device still has a plurality of defects: 1. the crack development law in the sample seepage process cannot be detected at present, and the understanding of people on the seepage failure mechanism of the soil-rock mixture is greatly influenced; 2. the current triaxial seepage device can only realize a seepage test under a certain hydraulic gradient, but cannot realize a zero hydraulic gradient under a rainfall condition, and only causes a seepage related triaxial test under the action of gravity; 3. the existing triaxial seepage test device collects seepage fluid and soil particles together when collecting seepage soil particles, and cannot distinguish the seepage amount and the seepage amount of the particles at different time intervals in time.
Disclosure of Invention
In order to solve the technical problems, the invention provides a fracture real-time visualization seepage erosion soil-water determination triaxial test device and method, which can realize omnibearing real-time scanning imaging of an experimental seepage process, realize a triaxial seepage process under the action of gravity only with zero hydraulic gradient, better observe the change conditions of particle outflow and permeability coefficient in different time periods, improve the test precision and reduce the labor intensity.
The technical scheme adopted by the invention for solving the technical problems is as follows: a three-axis test device for measuring seepage erosion soil and water in real time visualization of cracks comprises an axial force control device, a base, a three-axis pressure chamber, a seepage collection device and a CT scanning system;
the axial force control device comprises a support, a vertical loading structure and a loading rod;
the support is provided with the vertical loading mechanism, the output end of the vertical loading mechanism is fixed at the upper end of the loading rod, the lower end of the loading rod extends downwards into the triaxial pressure chamber, the loading rod is in sliding fit with the triaxial pressure chamber, and the middle part of the loading rod is provided with a tension and compression sensor;
a rotary table is arranged on the base, and the three-axis pressure chamber is arranged on the rotary table;
the three-axis pressure chamber is respectively communicated with an oil pipeline and an oil outlet pipeline, and an upper porous plate, a lower porous plate, a rubber sleeve and a pressure cap are arranged in the three-axis pressure chamber;
the upper porous plate and the lower porous plate are respectively arranged at the upper end and the lower end of the rubber sleeve, the pressure cap is downwards buckled on the upper surface of the upper porous plate, the pressure cap is fixed with the lower end of the loading rod, and the pressure cap is respectively communicated with a water inlet pipeline and a water outlet pipeline; the lower surface of the lower porous plate is fixedly butted with the feed end of the seepage pipeline;
the seepage collecting device comprises a weighing mechanism, an upper separating cylinder, a lower separating cylinder, a permeable stone and a measuring cylinder;
the lower separation cylinder is fixed on the object placing table of the weighing structure, an upper cylinder opening of the lower separation cylinder is in butt joint with a lower cylinder opening of the upper separation cylinder, the permeable stone is arranged at the butt joint position of the lower separation cylinder and the upper separation cylinder, the lower separation cylinder extends into the measuring cylinder through a pipeline, the pipeline is provided with a numerical control valve, and the upper separation cylinder is communicated with a discharge end of the deep flow pipeline;
the CT scanning system comprises an X-ray source and a detector which are arranged on two sides of the triaxial pressure chamber.
Preferably, the support includes bracing piece and reaction roof beam, the bracing piece vertically distribute in the periphery of revolving stage, the lower extreme of bracing piece is fixed in the base, the upper end of bracing piece is through the reaction roof beam is connected, vertical loading mechanism is fixed in the reaction roof beam.
Preferably, the triaxial pressure chamber is provided with a release valve.
Preferably, the triaxial cell comprises an upper cover, a base, an outer cover and a long rod bolt; the upper cover and the base are respectively buckled at the upper end and the lower end of the outer cover, and the upper cover and the base are tightened and fixed through the long rod bolt.
Preferably, oil pipeline with the inlet channel certainly the left base of triaxial cell is inserted, oil outlet pipeline and outlet conduit certainly the base on triaxial cell right side is inserted, oil pipeline, inlet tube, oil outlet pipeline and outlet conduit are equipped with the numerical control valve respectively.
Preferably, the metal pipe is arranged on one side, close to the base, of the valves of the oil pipeline, the water inlet pipe, the oil outlet pipeline and the water outlet pipeline, and the rubber hose is arranged on one side, far away from the base, of the valves.
Preferably, the inlet conduit extends to the interior of the pressure cap and the outlet conduit is butted against a side wall of the pressure cap.
Preferably, a snap ring for holding the permeable stone is arranged at an upper opening of the lower separation cylinder, and the upper separation cylinder is in threaded connection with the lower separation cylinder.
Preferably, the system further comprises a pressure control system, wherein the pressure control system comprises a water storage tank, a water pump, an oil storage tank and an oil pump; the water storage tank is communicated with the water outlet pipeline and the water inlet pipeline, a water pump is arranged in the water storage tank, the oil storage tank is respectively communicated with the fish oil pipeline and the oil outlet pipeline, and an oil pump is arranged in the oil storage tank.
A three-axis test method for measuring seepage erosion soil and water in real time in a fracture visualization manner comprises the following steps:
placing a porous plate on the upper part and the lower part of a sample, fixing the porous plate on a base, connecting a pressure cap to the upper part of the sample, fixedly connecting a base of a three-axis pressure chamber with a turntable, and starting a pressure control system to apply confining pressure and axial pressure to the pressure chamber;
step two, controlling the rotation speed and the positive and negative rotation period of the turntable so as to cooperate with a CT scanning system to form images; meanwhile, the CT scanning system is started, the height and the distance of the X-ray source are adjusted, and the distance of the detector is adjusted through the movable X-ray source so as to control the imaging quality.
Step three, opening a water pipe valve, supplying water from the water storage tank to the pressure cap, opening a water outlet pipe valve when a seepage test is carried out under the action of zero hydraulic gradient gravity, so that the pressure cap is always at an extremely low water level, and the water in the pressure cap flows out and enters the water storage tank again for circulation; when a seepage test is carried out under the action of multiple hydraulic gradients, a valve of the water outlet pipeline is closed, and the water pressure in the pressure cap is monitored through a pressure sensor;
step four, carrying out a seepage test, respectively scanning the excessive cross sections of the sample by a CT scanning system in a fixed time period, and monitoring the development condition of the internal pores in real time;
controlling the opening time of a numerical control valve at the tail end of the seepage channel, firstly storing a soil-water mixture in the seepage channel at intervals, when the valve is opened, allowing the soil-water mixture to flow into a separation cylinder, distinguishing water and soil particles through permeable stones, allowing seepage fluid to enter a lower separation cylinder, allowing the initial liquid level in the lower separation cylinder to be flush with a separation pipe, and controlling the opening time of the numerical control valve of the separation pipe to monitor the seepage amount of the fluid in a fixed time interval; weighing devices respectively arranged at the lower parts of the separation cylinder and the measuring cylinder can respectively and accurately measure the yielding particles and the water;
and step six, closing the water delivery and outlet valves of the pressure cap, closing the seepage pipeline of the base, and changing confining pressure or axial pressure according to the test scheme until a preset test target is reached.
The invention has the advantages that:
(1) the invention combines the CT scanning technology and the triaxial seepage test, realizes the omnibearing real-time scanning imaging of the sample seepage process through the rotating device, solves the problem that the prior scanning and the triaxial test can not be carried out simultaneously, and has remarkable superiority.
(2) The upper part of the pressure cap is provided with a seepage water pipeline, the lower part of the pressure cap is provided with a water outlet pipeline close to the porous plate, when the water outlet pipeline is closed, any hydraulic gradient seepage test can be realized, when the water outlet pipeline is opened, the liquid level in the pressure cap is always at an extremely low level, the rain infiltration process under the action of gravity can be simulated, the effective combination of various seepage modes is realized, and the triaxial seepage process under the action of gravity only under the zero hydraulic gradient is realized.
(3) The water conveying pipeline and the water outlet pipeline in the pressure cap are both connected to the water storage tank, and when the valve of the water outlet pipeline is opened for a seepage test under the action of gravity, water in the pressure cap flows back to the water storage tank again, so that the cyclic utilization of resources is realized, and the pressure cap has higher environmental benefit.
(4) The seepage collecting device can ideally realize the separation of soil particles and water in the seepage process, and can simultaneously measure the seepage coefficient and the particle outflow of a sample under different confining pressures. Meanwhile, the device can adjust the acquisition time of single seepage materials through a numerical control valve, can better observe the change conditions of the particle outflow and the permeability coefficient in different time periods, improves the test precision and reduces the labor intensity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only three of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a tri-axial pressure chamber of an embodiment of the present invention;
FIG. 3 is a schematic view of an infiltration collection apparatus according to an embodiment of the invention;
the device comprises a support rod 1, a reaction beam 2, a loading rod 3, a tension and compression sensor 4, a base 5, an oil pipeline 6, a water inlet pipeline 7, an oil outlet pipeline 8, a water outlet pipeline 9, an oil storage tank 10, a water storage tank 11, an X-ray source 12, a detector 13, a rotary table 14, a long rod bolt 15, an upper cover 16, a deflation valve 17, an outer cover 18, an upper porous plate 19, a pressure cap 20, a sample 21, a rubber sleeve 22, a lower porous plate 23, a base 24, a seepage pipeline 25, an upper separating cylinder 26, a lower separating cylinder 27, a permeable stone 28, a clamping ring 29, a measuring cylinder 30 and a weighing mechanism 31.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for illustration only and are not intended to limit the scope of the present invention.
Examples
As shown in figure 1, the fracture real-time visualization seepage erosion soil-water determination triaxial test device comprises an axial force control device, a base 5, a triaxial pressure chamber, a seepage collection device and a CT scanning system.
The axial force control device comprises a support, a vertical loading structure and a loading rod 3.
Set up on the support vertical loading mechanism, vertical loading mechanism's output in the upper end of loading rod 3 is fixed, the lower extreme downwardly extending of loading rod 3 in the triaxial pressure chamber, loading rod 3 with triaxial pressure chamber sliding fit, the middle part of loading rod 3 is equipped with draws pressure sensor 4. The vertical loading mechanism is a vertical driving mechanism and can adopt modes such as an electric push rod or an air cylinder. The pull-press type sensor 4 is CKY-1S of a CKY model of a central aeronautical instrument.
The base 5 is provided with a rotary table 14, and the rotary table 14 is provided with the three-axis pressure chamber.
The three-axis pressure chamber is respectively communicated with an oil pipeline 6 and an oil outlet pipeline 8, and an upper porous plate 19, a lower porous plate 23, a rubber sleeve 22 and a pressure cap 20 are arranged in the three-axis pressure chamber; the triaxial pressure chamber is provided with a release valve 17.
The upper porous plate 19 and the lower porous plate 23 are respectively arranged at the upper end and the lower end of the rubber sleeve 22, the pressure cap 20 is downwards buckled on the upper surface of the upper porous plate 19, the pressure cap 20 is fixed with the lower end of the loading rod 3, and the pressure cap 20 is respectively communicated with a water inlet pipeline 7 and a water outlet pipeline 9; the lower surface of the lower porous plate 23 is fixedly butted with the feed end of the seepage pipeline 25.
The seepage collecting device comprises a weighing mechanism 31, an upper separating cylinder 26, a lower separating cylinder 27, a permeable stone 28 and a measuring cylinder 30.
The lower separation cylinder 27 is fixed on the object placing table of the weighing structure, an upper cylinder opening of the lower separation cylinder 27 is in butt joint with a lower cylinder opening of the upper separation cylinder 26, the permeable stone 28 is arranged at the butt joint position of the lower separation cylinder 27 and the upper separation cylinder 26, the lower separation cylinder 27 extends into the measuring cylinder 30 through a pipeline, the pipeline is provided with a numerical control valve, and the upper separation cylinder 26 is communicated with a discharge end of the deep flow pipeline; the weighing mechanism who uses in this scheme is the electronic scale.
The CT scanning system includes an X-ray source 12 and a detector 13 disposed on both sides of the triaxial cell. The CT scanning system is conventional and will not be described herein.
The support includes bracing piece 1 and reaction roof beam 2, bracing piece 1 vertical distribution in the periphery of revolving stage 14, the lower extreme of bracing piece 1 is fixed in base 5, the upper end of bracing piece 1 is passed through reaction roof beam 2 is connected, vertical loading mechanism is fixed in reaction roof beam 2.
The triaxial pressure chamber comprises an upper cover 16, a base 24, an outer cover 18 and a long rod bolt 15; the upper cover 16 and the base 24 are respectively fastened to the upper end and the lower end of the outer cover 18, and the upper cover 16 and the base 24 are fastened and fixed by the long rod bolt 15.
The valve of the oil pipeline 6, the water inlet pipe, the oil outlet pipeline 8 and the water outlet pipeline 9 is a metal pipe on one side close to the base 24, and the valve is far away from one side of the base 24 is a rubber hose.
The water inlet pipe 7 extends to the inside of the pressure cap 20, and the water outlet pipe 9 is butted against the side wall of the pressure cap 20.
The upper opening of the lower separation cylinder 27 is provided with a snap ring 29 for holding the permeable stone 28, and the upper separation cylinder 26 is in threaded connection with the lower separation cylinder 27.
The device also comprises a pressure control system, wherein the pressure control system comprises a water storage tank 11, a water pump, an oil storage tank 10 and an oil pump; the water storage tank 11 is communicated with the water outlet pipeline 9 and the water inlet pipeline 7, a water pump is arranged in the water storage tank 11, the oil storage tank 10 is communicated with the fish oil pipeline 6 and the oil outlet pipeline 8 respectively, and an oil pump is arranged in the oil storage tank 10.
A three-axis test method for measuring seepage erosion soil and water in real time in a fracture visualization manner comprises the following steps:
placing a porous plate on the upper portion and the lower portion of a sample 21, fixing the porous plate on a base 24, connecting a pressure cap 20 to the upper portion of the sample 21, fixedly connecting the base 24 of a three-axis pressure chamber with a rotary table 14, and starting a pressure control system to apply confining pressure and axial pressure to the pressure chamber;
step two, controlling the rotation speed and the positive and negative rotation periods of the turntable 14 to cooperate with a CT scanning system to form images; meanwhile, the CT scanning system is started, the height and the distance of the X-ray source 12 are adjusted, and the distance of the detector 13 is adjusted through the movable X-ray source 12 to control the imaging quality.
Step three, opening a water pipe valve, supplying water into the pressure cap 20 from the water storage tank 11, opening a valve of a water outlet pipe 9 when a seepage test is carried out under the action of zero hydraulic gradient gravity, enabling the pressure cap 20 to be always at an extremely low water level, and enabling water in the pressure cap 20 to flow out and enter the water storage tank 11 again for circulation; when a seepage test is carried out under the action of multiple hydraulic gradients, the valve of the water outlet pipeline 9 is closed, and the water pressure in the pressure cap 20 is monitored through a pressure sensor;
step four, carrying out a seepage test, and respectively scanning the excessive sections of the sample 21 by a CT scanning system in a fixed time period to monitor the development condition of the internal pores in real time;
controlling the opening time of a numerical control valve at the tail end of the seepage channel, firstly storing a soil-water mixture in the seepage channel 25 at intervals, when the valve is opened, allowing the soil-water mixture to flow into a separation cylinder, distinguishing water and soil particles through a permeable stone 28, allowing seepage fluid to enter a lower separation cylinder 27, allowing the initial liquid level in the lower separation cylinder 27 to be flush with a separation pipe, and controlling the opening time of the numerical control valve of the separation pipe to monitor the seepage amount of the fluid in a fixed time interval; weighing devices respectively arranged at the lower parts of the separating cylinder and the measuring cylinder 30 can respectively and accurately measure the discharged soil particles and water;
and step six, closing the water delivery and outlet valves of the pressure cap 20, closing the base seepage pipeline 25, and changing the confining pressure or the axial pressure according to the test scheme until the preset test target is reached.
The invention has the advantages that:
(1) the invention combines the CT scanning technology and the triaxial seepage test, realizes the omnibearing real-time scanning imaging of the seepage process of the sample 21 through the rotating device, solves the problem that the prior scanning and the triaxial test can not be carried out simultaneously, and has obvious superiority.
(2) The upper part of the pressure cap 20 is provided with a seepage water pipeline, the lower part of the pressure cap is provided with a water outlet pipeline 9 in a position close to the porous plate, when the water outlet pipeline 9 is closed, any hydraulic gradient seepage test can be realized, when the water outlet pipeline 9 is opened, the liquid level in the pressure cap 20 is always at an extremely low level, the rain infiltration process falling under the action of gravity can be simulated, the effective combination of various seepage modes is realized, and the triaxial seepage process only under the action of gravity with zero hydraulic gradient is realized.
(3) According to the invention, the water conveying pipeline in the pressure cap 20 and the water outlet pipeline 9 are both connected to the water storage tank 11, and when the valve of the water outlet pipeline 9 is opened to perform a seepage test under the action of gravity, water in the pressure cap 20 flows back to the water storage tank 11 again, so that the cyclic utilization of resources is realized, and the high environmental benefit is achieved.
(4) The seepage collecting device can ideally realize the separation of soil particles and water in the seepage process, and can simultaneously measure the seepage coefficient and the particle outflow of the sample 21 under different confining pressures. Meanwhile, the device can adjust the single seepage material acquisition time through the numerical control valve, can better observe the change conditions of the particle outflow and the permeability coefficient in different time periods, improve the test precision and reduce the labor intensity.
The above embodiments should not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent transformations fall within the protection scope of the present invention.
Claims (10)
1. A three-axis test device for measuring seepage erosion soil and water in real time in a fracture visualization manner is characterized by comprising an axial force control device, a base (5), a three-axis pressure chamber, a seepage collection device and a CT scanning system;
the axial force control device comprises a support, a vertical loading structure and a loading rod (3);
the support is provided with the vertical loading mechanism, the output end of the vertical loading mechanism is fixed at the upper end of the loading rod (3), the lower end of the loading rod (3) extends downwards into the three-axis pressure chamber, the loading rod (3) is in sliding fit with the three-axis pressure chamber, and the middle part of the loading rod (3) is provided with a tension and compression sensor (4);
a rotary table (14) is arranged on the base (5), and the three-axis pressure chamber is arranged on the rotary table (14);
the three-axis pressure chamber is respectively communicated with an oil pipeline (6) and an oil outlet pipeline (8), and an upper porous plate (19), a lower porous plate (23), a rubber sleeve (22) and a pressure cap (20) are arranged in the three-axis pressure chamber;
the upper porous plate (19) and the lower porous plate (23) are respectively arranged at the upper end and the lower end of the rubber sleeve (22), the pressure cap (20) is downwards buckled on the upper surface of the upper porous plate (19), the pressure cap (20) is fixed with the lower end of the loading rod (3), and the pressure cap (20) is respectively communicated with a water inlet pipeline (7) and a water outlet pipeline (9); the lower surface of the lower porous plate (23) is fixedly butted with the feed end of the seepage pipeline (25);
the seepage collecting device comprises a weighing mechanism (31), an upper separating cylinder (26), a lower separating cylinder (27), a permeable stone (28) and a measuring cylinder (30);
the lower separation cylinder (27) is fixed on the object placing table of the weighing structure, an upper cylinder opening of the lower separation cylinder (27) is in butt joint with a lower cylinder opening of the upper separation cylinder (26), the joint of the lower separation cylinder (27) and the upper separation cylinder (26) is provided with the permeable stone (28), the lower separation cylinder (27) extends into the measuring cylinder (30) through a pipeline, the pipeline is provided with a numerical control valve, and the upper separation cylinder (26) is communicated with a discharge end of the deep flow pipeline;
the CT scanning system comprises an X-ray source (12) and a detector (13) which are arranged on two sides of the triaxial pressure chamber.
2. The fracture real-time visualization seepage erosion soil and water determination triaxial test device according to claim 1, characterized in that: the support includes bracing piece (1) and reaction roof beam (2), bracing piece (1) vertical distribution in the periphery of revolving stage (14), the lower extreme of bracing piece (1) is fixed in base (5), the upper end of bracing piece (1) is passed through reaction roof beam (2) are connected, vertical loading mechanism is fixed in reaction roof beam (2).
3. The fracture real-time visualization seepage erosion soil and water determination triaxial test device according to claim 1, characterized in that: the triaxial pressure chamber is provided with a deflation valve (17).
4. The fracture real-time visualization seepage erosion soil and water determination triaxial test device according to claim 1, characterized in that: the triaxial pressure chamber comprises an upper cover (16), a base (24), an outer cover (18) and a long rod bolt (15); the upper cover (16) and the base (24) are respectively buckled at the upper end and the lower end of the outer cover (18), and the upper cover (16) and the base (24) are tightened and fixed through the long rod bolt (15).
5. The fracture real-time visualization seepage erosion soil and water determination triaxial test device according to claim 4, wherein: oil pipeline (6) with inlet channel (7) certainly base (24) on the left of triaxial cell insert, oil outlet pipe way (8) and outlet conduit (9) certainly base (24) on the right side of triaxial cell insert, oil pipeline (6), inlet tube, oil outlet pipe way (8) and outlet conduit (9) are equipped with the numerical control valve respectively.
6. The crack real-time visualization seepage erosion soil and water determination triaxial test device according to claim 5, characterized in that: the valve of oil pipeline (6), inlet tube, oil outlet pipeline (8) and outlet conduit (9) is close to base (24) one side and is the tubular metal resonator, and the valve is kept away from one side of base (24) is flexible rubber hose.
7. The fracture real-time visualization seepage erosion soil and water determination triaxial test device according to claim 1, characterized in that: the water inlet pipeline (7) extends to the inside of the pressure cap (20), and the water outlet pipeline (9) is butted with the side wall of the pressure cap (20).
8. The fracture real-time visualization seepage erosion soil and water determination triaxial test device according to claim 1, characterized in that: a snap ring (29) for holding the permeable stone (28) is arranged at the upper opening of the lower separation cylinder (27), and the upper separation cylinder (26) is in threaded connection with the lower separation cylinder (27).
9. The fracture real-time visualization seepage erosion soil and water determination triaxial test device according to claim 1, characterized in that: the device also comprises a pressure control system, wherein the pressure control system comprises a water storage tank (11), a water pump, an oil storage tank (10) and an oil pump; storage water tank (11) communicate in outlet conduit (9) and inlet channel (7) intercommunication, be equipped with the water pump in storage water tank (11), oil storage tank (10) communicate fish oil pipeline (6) and oil outlet pipeline (8) respectively, be equipped with the oil pump in oil storage tank (10).
10. The fracture real-time visualization seepage erosion soil-water determination triaxial test method according to claim 1, characterized in that: the method comprises the following steps:
placing a porous plate on the upper and lower parts of a sample (21) and fixing the porous plate on a base (24), connecting a pressure cap (20) to the upper part of the sample (21), fixedly connecting the base (24) of a three-axis pressure chamber with a rotary table (14), and starting a pressure control system to apply confining pressure and axial pressure to the pressure chamber;
step two, controlling the rotation speed and the positive and negative rotation period of the turntable (14) to cooperate with a CT scanning system to form images; meanwhile, a CT scanning system is started, the height and the distance of the X-ray source (12) are adjusted, and the distance of the detector (13) is adjusted through the movable X-ray source (12) to control the imaging quality.
Step three, opening a water pipe valve, supplying water into the pressure cap (20) from the water storage tank (11), opening a water outlet pipe (9) valve when a seepage test is carried out under the action of zero hydraulic gradient gravity, enabling the pressure cap (20) to be always at an extremely low water level, and enabling water in the pressure cap (20) to flow out and enter the water storage tank (11) again for circulation; when a seepage test is carried out under the action of multiple hydraulic gradients, the valve of the water outlet pipeline (9) is closed, and the water pressure in the pressure cap (20) is monitored through the pressure sensor;
step four, carrying out a seepage test, and respectively scanning the excessive sections of the sample (21) by a CT scanning system in a fixed time period to monitor the development condition of the internal pores in real time;
controlling the opening time of a numerical control valve at the tail end of a seepage channel, firstly storing a soil-water mixture in a seepage pipeline (25) at intervals, when the valve is opened, allowing the soil-water mixture to flow into a separation cylinder, distinguishing water from soil particles through a permeable stone (28), allowing seepage fluid to enter a lower separation cylinder (27), enabling the initial liquid level in the lower separation cylinder (27) to be flush with a separation pipe, and controlling the opening time of the numerical control valve of the separation pipe to monitor the seepage amount of the fluid in a fixed period; weighing devices respectively arranged at the lower parts of the separating cylinder and the measuring cylinder (30) can respectively and accurately measure the discharged soil particles and water;
and step six, closing the water delivery and outlet valves of the pressure cap (20), closing the seepage pipeline (25) of the base (24), and changing confining pressure or axial pressure according to a test scheme until a preset test target is reached.
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