CN113884423A - Device for testing silting-up characteristic of drainage anti-liquefaction channel of gravel pile indoors - Google Patents
Device for testing silting-up characteristic of drainage anti-liquefaction channel of gravel pile indoors Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 239000002689 soil Substances 0.000 claims abstract description 114
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 89
- 238000006243 chemical reaction Methods 0.000 claims abstract description 50
- 239000011148 porous material Substances 0.000 claims abstract description 33
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims description 30
- 238000005192 partition Methods 0.000 claims description 16
- 239000004575 stone Substances 0.000 claims description 9
- 230000035699 permeability Effects 0.000 abstract description 17
- 230000009471 action Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000012466 permeate Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
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- 238000013461 design Methods 0.000 description 2
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- 230000000877 morphologic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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Abstract
The invention discloses a device for testing silting-up characteristics of a drainage anti-liquefaction channel of a gravel pile indoors, which comprises a soil sample chamber, wherein a transparent cylinder structure with a closed bottom is adopted, and scales are arranged on the side wall of the transparent cylinder structure, so that the moving silting-up condition of a soil sample in the soil sample chamber can be conveniently observed; the vertical loading system comprises a reaction frame and a pressurizing mechanism, the soil sample chamber is arranged in the reaction frame, and the pressurizing mechanism is arranged on the reaction frame and is used for applying vertical pressure to a soil sample in the soil sample chamber; the pore pressure loading system is communicated with a water outlet arranged at the top of the soil sample chamber and a water inlet arranged at the bottom of the soil sample chamber and is used for providing different pore pressures when the soil sample chamber is used for performing a seepage clogging test; and the power system provides power sources for the vertical loading system and the pore pressure loading system. The device has simple structure and convenient operation, can observe the clogging state of the gravel pile drainage liquefaction-resistant channel under the action of different confining pressures and pore pressure ratios, and can test the permeability coefficient after stable clogging.
Description
Technical Field
The invention belongs to the technical field of drainage anti-liquefaction of foundation treatment, and particularly relates to a device for testing silting-up characteristics of a drainage anti-liquefaction channel of a gravel pile indoors.
Background
For foundation treatment projects in strong earthquake areas, gravel pile composite foundation drainage anti-liquefaction foundation treatment is often adopted. The drainage and anti-liquefaction effect of the gravel pile is mainly achieved by providing a vertical drainage channel in the foundation body so as to quickly dissipate the excess pore water pressure generated by the earthquake effect. When a fixed replacement rate is selected, the permeability coefficient of the gravel pile body is a key factor influencing the rapid dissipation of pore pressure, but the permeability coefficient of the drainage channel of the gravel pile is easily blocked by the movement of surrounding soil particles, so that the permeability coefficient of the pile body is reduced, and the long-term service performance of the drainage channel of the gravel pile is influenced. In the design process of gravel pile anti-liquefaction foundation treatment, a proper drainage channel permeability coefficient is usually selected according to gravel gradation, but after pile forming or a long-term service process, the original gradation of the drainage channel is changed, and the permeability coefficient deviates from the original design value, so that the drainage performance of the drainage channel after clogging needs to be reasonably evaluated in the design stage.
The existing common method for acquiring the silting characteristics of the drainage channel is based on-site core drilling sampling, and grading analysis and permeability coefficient measurement are carried out indoors to evaluate the performance of the drainage channel after the silting, but the disturbance sample cannot observe the morphological distribution of sandy soil particle silting, the grading of the core sample is easy to interfere, if a non-disturbance sampling method is selected, the cost is high, and in addition, the field sampling cannot acquire the silting characteristics of the drainage channel under the action of different confining pressures and hole pressure ratios.
Therefore, a device which is convenient for detecting the silting characteristic of the drainage channel needs to be developed, the silting form and permeability coefficient change of soil particles around the drainage channel to the pile body can be accurately obtained, and the drainage function of the gravel pile after silting is reasonably evaluated.
Disclosure of Invention
In view of the above, the invention provides a device for testing clogging characteristics of a drainage liquefaction-resistant channel of a gravel pile indoors, which can be used for observing the clogging state of the liquefaction-resistant channel of the gravel pile under the action of different confining pressures and hole pressure ratios and testing the permeability coefficient after stable clogging.
The invention is realized by the following technical scheme:
an apparatus for indoor testing of gravel pile drainage anti-liquefaction channel fouling characteristics, comprising:
the soil sample chamber is of a transparent cylindrical structure with a closed bottom, scales are arranged on the side wall of the soil sample chamber, a water permeable bottom plate and a water permeable partition plate are arranged inside the soil sample chamber, and the water permeable partition plate is vertically arranged at the bottom of the soil sample chamber; the water-permeable bottom plate is positioned at the upper part of the water-permeable partition plate and is used for filling soil samples; the top of the soil sample chamber is provided with a water outlet, and the bottom of the soil sample chamber is provided with a water inlet;
the vertical loading system comprises a reaction frame and a pressurizing mechanism, the soil sample chamber is arranged in the reaction frame, and the pressurizing mechanism is arranged at the top of the reaction frame and penetrates through the reaction frame to be in contact with a soil sample in the soil sample chamber so as to apply vertical pressure to the soil sample;
the pore pressure loading system is communicated with the water outlet and the water inlet and is used for providing different pore pressures when a soil sample chamber is subjected to a seepage siltation test;
and the power system is electrically connected with the vertical loading system and the pore pressure loading system respectively and provides power sources for the vertical loading system and the pore pressure loading system.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the transparent cylinder as the experimental device, has good stability, is not easily interfered by the external environment, can conveniently observe the silted-up morphological distribution of sandy soil particles and the moving convergence condition of the soil sample under different pressures, obtains the relation between the silted-up thickness and the time, and effectively reduces the experimental error.
2. The soil sample chamber is combined with the vertical loading system and the pore pressure loading system, so that confining pressure and pore pressure can be simultaneously applied to the soil sample, the soil sample chamber can be used for simulating environmental conditions of different depth positions and different pore pressures, and the permeability coefficient of the soil sample combination under the action of different confining pressures and pore pressures can be tested.
Furthermore, the reaction frame comprises a bottom plate, a top plate and a plurality of reaction pull rods, wherein two ends of each reaction pull rod are respectively and fixedly connected with the top plate and the bottom plate, and the top plate is further provided with a through hole for allowing the pressurizing mechanism to pass through. The reaction frame is used for providing support reaction force for the pressurizing mechanism and supporting the pressurizing mechanism. The top plate and the bottom plate are connected by a plurality of reaction pull rods in a spiral mode to form a reaction frame, the soil sample chamber is placed into the reaction frame from the top of the reaction frame, and a pneumatic cylinder in the pressurizing mechanism is arranged at the top of the reaction frame to vertically apply pressure to the soil sample chamber.
Further, the pressurizing mechanism comprises a pneumatic cylinder, a dowel bar and a water permeable loading plate; the pneumatic cylinder is arranged on the top plate, the bottom of the pneumatic cylinder is fixedly connected with the top plate, and the pneumatic cylinder covers the through hole; the water permeable loading plate is arranged in the soil sample chamber; one end of the dowel bar is arranged in the pneumatic cylinder, and the other end of the dowel bar penetrates through the through hole to enter the soil sample chamber and is fixedly connected with a permeable loading plate arranged above the soil sample. The pneumatic cylinder sets up at reaction frame top, applys the pressure value by driving system, realizes the vertical pressurization to the soil sample through dowel steel and the loading plate that permeates water to can simulate the confined pressure of soil sample in different degree of depth positions.
Further, the pore pressure loading system comprises a water tank, a gas-liquid converter and a measuring cylinder; the water tank is communicated with the gas-liquid converter through a three-way switch to realize the conversion of water pressure by air pressure, and the other port of the three-way switch is connected to a water inlet at the bottom of the soil sample chamber; the measuring cylinder is used for receiving water discharged from a water outlet at the top of the soil sample chamber. The water tank, the gas-liquid converter and the soil sample chamber are communicated and closed with each other by connecting the water tank and the gas-liquid converter with the soil sample chamber through a three-way switch; in the test process, an operator rotates the three-way switch to communicate the soil sample chamber and the water tank, water in the water tank enters the soil sample chamber from the water inlet at the bottom of the soil sample chamber, when the water overflows from the water outlet after overflowing the soil sample, the three-way switch is rotated to communicate the gas-liquid converter and the soil sample chamber, the power system provides test air pressure for the gas-liquid converter, meanwhile, the water in the gas-liquid converter flows into the soil sample chamber under the action of the air pressure and flows out of the measuring cylinder from the water outlet, and in the process, the moving silting condition of the soil sample under the action of the pore pressure is observed and relevant data are recorded.
Furthermore, the power system adopts a double-outlet air compressor, one outlet of the double-outlet air compressor is connected with a pneumatic cylinder, and the other outlet of the double-outlet air compressor is connected with a gas-liquid converter.
Further, a pneumatic valuator and a barometer are connected in series between the double-outlet air compressor and the pneumatic cylinder and between the double-outlet air compressor and the gas-liquid converter. The pneumatic valuator is used for stabilizing and adjusting pressure and is matched with a barometer to accurately control the pressure value applied to the pneumatic cylinder and the gas-liquid converter.
Furthermore, the water-permeable bottom plate and the water-permeable partition plate are welded and fixed, and a water-permeable stone layer is laid on the water-permeable bottom plate. The bottom plate and the partition plate are welded to form an assembly with a certain cavity, and the sand particles remained at the bottom in the barrel can be conveniently cleaned after the test. The combined piece is arranged at the bottom of the soil sample chamber, a water inlet of the soil sample chamber is arranged in a formed cavity, water enters the soil sample chamber from the bottom, sequentially passes through the combined piece, the permeable stone, the soil sample and the permeable loading plate, and finally overflows to the measuring cylinder from a water outlet. The permeable bottom plate and the permeable partition plate form a cavity, so that water pressure can be uniformly applied to the bottom of the soil sample, the pressure loaded on the upper part can be transmitted, and the permeable stone layer arranged on the bottom plate can transmit pore pressure and can prevent sandy soil from scattering.
Further, the pressurizing mechanism further comprises a pressure sensor, and the pressure sensor is fixed on the dowel bar to measure the pressure of the dowel bar. The pressure sensor is arranged on the dowel bar and feeds back the applied load.
Furthermore, a limiting groove with the diameter consistent with that of the soil sample chamber is formed in the bottom plate and used for centering and limiting the soil sample chamber. The soil sample room is placed in spacing recess, prevents to remove about, reduces experimental error.
Furthermore, one end of the counter-force pull rod is provided with an external thread, the edge position of the bottom plate is provided with an internal thread matched with the counter-force pull rod, and the counter-force pull rod and the bottom plate are spirally and fixedly connected through the external thread; and a round hole corresponding to the counter-force pull rod is formed in the top plate, and the other end of the counter-force pull rod penetrates through the round hole to be fixedly connected with the top plate through a nut.
Drawings
FIG. 1 is a schematic structural diagram of a testing apparatus according to the present invention;
FIG. 2 is a top view of a water-permeable substrate in the testing apparatus of the present invention;
FIG. 3 is a side view of a water permeable barrier in a test apparatus of the present invention;
FIG. 4 is a schematic structural diagram of a reaction frame in the testing apparatus of the present invention;
FIG. 5 is a side view of a reaction frame in the test apparatus of the present invention.
Wherein, figure description, 1-soil sample chamber; 2-a reaction frame; 3-a pressurizing mechanism; 4-a gas-liquid converter; 5-a water tank; 6-three-way switch; 7-measuring cylinder; 8-double outlet air compressor; 9-a pneumatic valuator; 10-barometer; 11-a water inlet; 12-a water outlet; 13-a water-permeable bottom plate; 14-a water-permeable barrier; 15-permeable stone; 21-a bottom plate; 22-a top plate; 23-a counter-force pull rod; 24-a nut; 25-limiting clamping groove; 31-pneumatic cylinders; 32-dowel bars; 33-water permeable loading plates; 34-a pressure sensor; 41-gas-liquid converter exhaust port; 51-tank outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification, but the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and the scope of the present invention is not limited thereto.
Referring to fig. 1, the invention provides a device for testing siltation characteristics of a drainage anti-liquefaction channel of a gravel pile indoors, which comprises a soil sample chamber 1, a vertical loading system, a pore pressure loading system and a power system;
the soil sample chamber 1 is of a transparent cylinder structure with a closed bottom, scales are arranged on the cylinder wall, a water outlet 12 is formed in the side wall of the top, a water inlet 11 is formed in the side wall of the bottom, a water permeable bottom plate 13 and a water permeable partition plate 14 are arranged inside the soil sample chamber, the top of the water permeable bottom plate 13 and the top of the water permeable partition plate 14 are welded into an assembly and placed at the bottom of the soil sample chamber 1, and the water permeable bottom plate 13 and the bottom of the soil sample chamber 1 are separated by the water permeable partition plate 14 to form a certain cavity, as shown in fig. 2 and 3; the water inlet 11 of the side wall of the bottom of the soil sample chamber 1 is arranged in the formed cavity, water enters the soil sample chamber 1 from the bottom and gradually overflows the soil sample and overflows from the water outlet 12. In addition, the cavities formed by the water-permeable partition plates 14 can ensure that water pressure is uniformly applied to the bottom of the soil sample 1 and can transmit the pressure loaded on the upper part, and the water-permeable stones 15 are placed on the water-permeable bottom plates 13, so that the sand and soil can be prevented from scattering while the pore pressure is transmitted.
The soil sample chamber 1 of the embodiment adopts a transparent organic glass cylinder with a closed bottom, the inner diameter of the transparent organic glass cylinder is 300mm, the inner height of the transparent organic glass cylinder is 400mm, the wall thickness of the transparent organic glass cylinder is 10mm, and the ratio of the inner diameter to the maximum particle size of the transparent organic glass cylinder in the penetration test is not less than 5:1 according to the standard of soil engineering test methods (GBT50123-2019), so that the transparent organic glass cylinder in the embodiment can be used for testing crushed stones with the maximum particle size of 60 mm.
The vertical loading system comprises a reaction frame 2 and a pressurizing mechanism 3, wherein the reaction frame 2 comprises a circular top plate 22, a bottom plate 21 and eight reaction pull rods 23, as shown in fig. 1, 4 and 5, circular holes matched with the reaction pull rods 23 are uniformly formed in the top plate 22 along the circumference, one end of each reaction pull rod 23 penetrates through the circular hole to be fixedly connected with a nut 24 on the top plate 22, so that the reaction pull rod is connected and fixed to the top plate 22, an external thread is arranged at the other end of the reaction pull rod, an internal thread matched with the external thread is formed in the corresponding position of the bottom plate 21, the other end of each reaction pull rod 23 is spirally connected and fixed with the bottom plate 21, and the reaction frame 2 is integrally formed to provide support counter force for the pressurizing mechanism 3; the pressurizing mechanism 3 comprises a pneumatic cylinder 31, a dowel bar 32 and a permeable loading plate 33, the pneumatic cylinder 31 is fixed at the middle position of the top plate 22 of the reaction frame, a through hole allowing the dowel bar 32 to pass through is formed in the top plate 22, the through hole is formed in the circle center position of the top plate 22, one end of the dowel bar 32 is arranged in the pneumatic cylinder 31, and the other end of the dowel bar passes through the through hole and is fixedly connected with the permeable loading plate 33 arranged above the soil sample; the reaction frame 2 provides support reaction force for the pneumatic cylinder 31, and the dowel bar 32 and the loading plate 33 that permeates water exert vertical pressure to the soil sample, simulate the confined pressure of soil sample in different degree of depth positions.
In this embodiment, the top plate 22 is a circular steel plate with a diameter of 480mm and a thickness of 20mm, and 8 circular holes with a diameter of 20mm are uniformly distributed on the circumference of the circular steel plate; the bottom plate 21 is a steel plate with the thickness of 50mm, and internal threads with the diameter of 20mm and the depth of 30mm are formed in the positions corresponding to the round holes; the reaction pull rod 23 is a high-strength pull rod with a diameter of 20 mm.
In this embodiment, the water permeable loading plate 33, the water permeable bottom plate 13 and the water permeable partition plate 14 are all made of steel plates with openings, the thickness of the steel plates is 10mm, the opening rate is 40% -60%, and the diameter of each opening is 2mm, so that water in the soil sample chamber 1 can be ensured to flow through all soil samples without hindrance.
In an embodiment, the bottom plate 21 of the reaction frame 2 is provided with a limiting clamping groove 25 with a depth of 2mm, the diameter of the limiting clamping groove 25 is consistent with that of the soil sample chamber 1, the central point of the limiting clamping groove 25 is located at the center of the bottom plate 21, and during use, the soil sample chamber 1 is placed in the limiting clamping groove 25 and is not easy to move, so that the test deviation caused by external influence in the test process is avoided.
In one embodiment, a pressure sensor 34 is further disposed on the dowel bar 32, and the pressure sensor 34 can monitor the pressure of the dowel bar 32 at any time and collect data for subsequent data processing.
The pore pressure loading system comprises a water tank 5, a gas-liquid converter 4 and a measuring cylinder 7; as shown in fig. 1, the water tank 5, the gas-liquid converter 4 and the water inlet 11 of the soil sample chamber 1 are communicated through a three-way switch 6, so that the water tank 5, the gas-liquid converter 4 and the soil sample chamber 1 are communicated and closed; the measuring cylinder 7 is arranged on the side of the reaction frame 2 and is used for receiving water discharged from a water outlet 12 at the top of the soil sample chamber 1.
Preferably, the tank outlet 51 is at the same height as the top of the gas-liquid converter 4.
Power system adopts two export air compressors 8, its one exit linkage to pneumatic cylinder 31, for pneumatic cylinder 31 provides pressure, another exit linkage to gas-liquid converter 4, for gas-liquid converter 4 provides atmospheric pressure, and between two export air compressors 8 and pneumatic cylinder 31 and gas-liquid converter 4, all still establish ties pneumatic valuator 9 and barometer 10, pneumatic cylinder 31 establishes ties through pneumatic valuator 9 and two export air compressors 8, but the pressure value on the soil body is applyed to accurate control, gas-liquid converter 4 establishes ties through pneumatic valuator 9 and two export air compressors 8, realize gas-liquid conversion, convert atmospheric pressure into water pressure, the accurate pore pressure of applying of cooperation barometer 10.
Based on the scheme, the test process of the invention is as follows:
1) taking out the soil sample chamber 1, sequentially and respectively placing the assembly of the water-permeable bottom plate 13 and the water-permeable partition plate 14 and the water-permeable stones 15, laying sandy soil and gravel layers in layers, placing the soil sample chamber 1 in the limiting groove 25 of the reaction frame bottom plate 21, and adjusting the dowel bar 32 and the water-permeable loading plate 33 to be in contact with the top surface of the gravel soil; then the three-way switch 6 is rotatably connected with the water tank 5 and the soil sample chamber 1, when water overflows from the water outlet 12 for 1-2min to fully saturate soil, then the three-way switch 6 is rotatably connected with the water tank 5 and the gas-liquid converter 4, the exhaust hole 41 of the gas-liquid converter is opened, and when the water level of the gas-liquid converter 4 is equal to the water level of the water tank 5, the three-way switch 6 is closed.
2) Start two export air compressors 8, open and vertical loading system UNICOM switch, exert fixed pressure value through pneumatic valuator 9, provide experimental confined pressure value, treat that the compressed soil body is stable after, open two export air compressors 8 and pore pressure loading system UNICOM switch, exert fixed pressure value through pneumatic valuator 9, provide experimental pore pressure, rotatory three way switch 6 UNICOM gas-liquid converter 4 and soil sample room 1 simultaneously, water in the gas-liquid converter 4 flows into soil sample room 1 under the super pore pressure effect this moment, according to from the bottom up order, the rivers are respectively through the bottom plate 13 that permeates water, permeate water stone 15 and the loading board 33 that permeates water, and spill over by delivery port 13, inflow graduated flask 7.
3) When the overflow of the water outlet 13 is stable, the sand particles can be observed to slowly move the siltation process under the action of the super-pore pressure, and the thickness H of the siltation layer is recorded at intervals while observation2When the clogging height is not changed any more, the flow rate received by the measuring cylinder 7 in unit time is recorded by using a stopwatch, the measurement is repeated three times, and the permeability coefficient K at the moment is calculated.
Respectively obtaining the permeability coefficient K of sandy soil before the test is started1And coefficient of permeability K of crushed rock3According to the continuous water flow principle of vertical seepage, the soil layer is respectively regarded as a sand layer, a silt blocking layer and a gravel layer, and the height can be measured to obtain H1、H3The flow velocity and the flow velocity of each flowing soil layerThe flow velocity of the effective soil layer is the same, and the permeability coefficient K of the silt plugging layer can be calculated2. According to the obtained thickness H of the silting layer2And permeability coefficient K2And the drainage liquefaction resistance characteristic of the blocked drainage channel can be evaluated.
According to the test device provided by the invention, the vertical loading system and the pore pressure loading system are simultaneously arranged, so that confining pressure and pore pressure can be simultaneously applied to the soil sample, the silting thickness of the gravel drainage channel under the action of different confining pressures and pore pressures and the permeability coefficient after silting stability are conveniently tested, and the drainage function of the gravel pile after silting is reasonably evaluated.
The testing device provided by the invention is convenient to operate, has good stability, can evaluate the performance of the drainage channel after clogging by carrying out grading analysis and permeability coefficient measurement indoors, is not influenced by the construction site environment, and can be popularized and used.
The above description is only a partial example of the present invention, and does not limit the embodiments and the protection scope of the present invention, therefore, it should be recognized that the present invention is covered by the protection scope of the present invention by the equivalent substitution and obvious change made by the description of the present invention for those skilled in the art.
Claims (10)
1. An apparatus for indoor testing of siltation characteristics of gravel pile drainage liquefaction-resistant channel, comprising:
the soil sample chamber is of a transparent cylindrical structure with a closed bottom, scales are arranged on the side wall of the soil sample chamber, a water permeable bottom plate and a water permeable partition plate are arranged inside the soil sample chamber, and the water permeable partition plate is vertically arranged at the bottom of the soil sample chamber; the water-permeable bottom plate is positioned at the upper part of the water-permeable partition plate and is used for filling soil samples; the top of the soil sample chamber is provided with a water outlet, and the bottom of the soil sample chamber is provided with a water inlet;
the vertical loading system comprises a reaction frame and a pressurizing mechanism, the soil sample chamber is arranged in the reaction frame, and the pressurizing mechanism is arranged at the top of the reaction frame and penetrates through the reaction frame to be in contact with a soil sample in the soil sample chamber so as to apply vertical pressure to the soil sample;
the pore pressure loading system is communicated with the water outlet and the water inlet and is used for providing different pore pressures when a soil sample chamber is subjected to a seepage siltation test;
and the power system is electrically connected with the vertical loading system and the pore pressure loading system respectively and provides power sources for the vertical loading system and the pore pressure loading system.
2. The device for indoor testing of the siltation characteristics of a gravel pile drainage anti-liquefaction channel as claimed in claim 1, wherein the reaction frame comprises a bottom plate, a top plate and a plurality of reaction pull rods, two ends of each reaction pull rod are respectively and fixedly connected with the top plate and the bottom plate, and the top plate is further provided with a through hole for allowing the pressurizing mechanism to pass through.
3. The device for indoor testing of the siltation characteristics of a gravel pile drainage anti-liquefaction channel according to claim 2, wherein the pressurizing mechanism comprises a pneumatic cylinder, a dowel and a water-permeable loading plate; the pneumatic cylinder is arranged on the top plate, the bottom of the pneumatic cylinder is fixedly connected with the top plate, and the pneumatic cylinder covers the through hole; the water permeable loading plate is arranged in the soil sample chamber; one end of the dowel bar is arranged in the pneumatic cylinder, and the other end of the dowel bar penetrates through the through hole to enter the soil sample chamber and is fixedly connected with a permeable loading plate arranged above the soil sample.
4. The apparatus for indoor testing of the siltation pile drainage anti-liquefaction channel fouling characteristics of claim 1, wherein the pore pressure loading system comprises a water tank, a gas-liquid converter and a measuring cylinder; the water tank is communicated with the gas-liquid converter through a three-way switch to realize the conversion of water pressure by air pressure, and the other port of the three-way switch is connected to a water inlet at the bottom of the soil sample chamber; the measuring cylinder is used for receiving water discharged from a water outlet at the top of the soil sample chamber.
5. The device for indoor testing of the siltation characteristics of gravel pile drainage anti-liquefaction channel clogging as claimed in claim 3 or 4, wherein the power system employs a double-outlet air compressor, one outlet of which is connected with the pneumatic cylinder, and the other outlet of which is connected with the gas-liquid converter.
6. The device for indoor testing of the siltation characteristics of gravel pile drainage anti-liquefaction channel clogging as claimed in claim 5, wherein a pneumatic valuator and a barometer are connected in series between the double-outlet air compressor and the pneumatic cylinder and between the double-outlet air compressor and the gas-liquid converter.
7. The device for testing the silting-up property of the drainage anti-liquefaction channel of the gravel pile indoors as claimed in claim 1, wherein the water-permeable bottom plate is welded and fixed with the water-permeable partition plate, and a water-permeable stone layer is laid on the water-permeable bottom plate.
8. The apparatus for indoor testing of clogging characteristics of a drainage anti-liquefaction channel of a gravel pile as set forth in claim 3, wherein the pressurizing mechanism further comprises a pressure sensor fixed to the dowel to measure the pressure of the dowel.
9. The device for indoor testing of the siltation characteristics of a gravel pile drainage anti-liquefaction channel as claimed in claim 2, wherein the bottom plate is provided with a limiting groove with a diameter consistent with that of the soil sample chamber for centering and limiting the soil sample chamber.
10. The device for indoor testing of the siltation characteristics of a gravel pile drainage liquefaction-resistant channel as claimed in claim 2, wherein one end of the reaction pull rod is provided with an external thread, the edge position of the bottom plate is provided with an internal thread matched with the reaction pull rod, and the reaction pull rod and the bottom plate are fixedly connected through the external thread in a spiral manner; and a round hole corresponding to the counter-force pull rod is formed in the top plate, and the other end of the counter-force pull rod penetrates through the round hole to be fixedly connected with the top plate through a nut.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111080061.XA CN113884423A (en) | 2021-09-15 | 2021-09-15 | Device for testing silting-up characteristic of drainage anti-liquefaction channel of gravel pile indoors |
| PCT/CN2022/109720 WO2023040492A1 (en) | 2021-09-15 | 2022-08-02 | Device for indoor test of clogging characteristics of gravel pile drainage anti-liquefaction channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111080061.XA CN113884423A (en) | 2021-09-15 | 2021-09-15 | Device for testing silting-up characteristic of drainage anti-liquefaction channel of gravel pile indoors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113884423A true CN113884423A (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111080061.XA Pending CN113884423A (en) | 2021-09-15 | 2021-09-15 | Device for testing silting-up characteristic of drainage anti-liquefaction channel of gravel pile indoors |
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| CN114459977A (en) * | 2022-01-07 | 2022-05-10 | 中交四航工程研究院有限公司 | Visual silting simulation system and method for gravel pile drainage structure |
| CN115754223A (en) * | 2022-10-13 | 2023-03-07 | 中国科学院武汉岩土力学研究所 | Shield tunnel wall back grouting test device and method considering large burial depth and high water pressure |
| WO2023040492A1 (en) * | 2021-09-15 | 2023-03-23 | 中交第四航务工程局有限公司 | Device for indoor test of clogging characteristics of gravel pile drainage anti-liquefaction channel |
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| CN116754452A (en) * | 2023-03-29 | 2023-09-15 | 广州大学 | Penetrometer |
| CN116380748B (en) * | 2023-04-19 | 2023-11-10 | 西南石油大学 | Permeability and erosion resistance measuring device for microorganism solidifying loess |
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| WO2023040492A1 (en) | 2023-03-23 |
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