CN211905361U - Suction control type unsaturated soil consolidation apparatus capable of accurately measuring sample displacement - Google Patents
Suction control type unsaturated soil consolidation apparatus capable of accurately measuring sample displacement Download PDFInfo
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- CN211905361U CN211905361U CN202020060377.7U CN202020060377U CN211905361U CN 211905361 U CN211905361 U CN 211905361U CN 202020060377 U CN202020060377 U CN 202020060377U CN 211905361 U CN211905361 U CN 211905361U
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Abstract
The utility model provides a but suction control formula unsaturated soil consolidation apparatus of accurate measurement sample displacement belongs to geotechnical engineering test instrument technical field. This consolidation apparatus includes: the device comprises a test bed, a pressure chamber, a thermostat, an air pressure system, a water discharge measuring system and a control system. The utility model can conveniently apply/control the substrate suction force; the step-by-step loading can be carried out through the automatic lifting loading test bed; the control system can set a reading time interval, and displacement readings in the time interval are automatically recorded in a computer; the constant temperature box is a temperature controllable system, and the pressure chamber is arranged in the constant temperature box to prevent the temperature difference from influencing the test; the water discharge measuring system can measure the water discharge of the sample in the consolidation process, is simple and convenient to operate, and can accurately measure the settlement in the consolidation process of the unsaturated soil.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering test instrument, specifically be a but unsaturated soil consolidation apparatus of suction control formula of accurate measurement sample displacement.
Background
Most of the natural soils are unsaturated, and artificial filling, collapsible loess and the like are typical unsaturated soils. Since the saturation of soil is often in a periodically changing state due to rainfall-evaporation, water level elevation, and the like, it is necessary to study the deformation characteristics of unsaturated soil.
The traditional consolidation apparatus is used for carrying out the consolidation test of unsaturated soil, so that the traditional consolidation apparatus is limited, the suction effect cannot be considered, the traditional consolidation apparatus is only suitable for saturated soil, and the settlement deformation and yield stress obtained according to the traditional consolidation apparatus are slightly conservative, so that the problems of high construction cost, poor economic benefit and the like are caused.
When the existing unsaturated consolidometer is used for carrying out an unsaturated test, manual loading and manual reading are mostly needed, and meanwhile, the temperature cannot be controlled, so that the measured sample settlement has a large error. And when the existing unsaturated consolidometer is used for unsaturated tests, the pore compression drainage in the consolidation process cannot be measured.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a but suction control formula unsaturated soil consolidation apparatus of accurate measurement sample displacement to solve the problem that provides among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a suction control type unsaturated soil consolidation apparatus capable of accurately measuring the water displacement of a sample comprises a test bed, a pressure chamber, a thermostat, an air pressure system, a water displacement measuring system and a control system;
the test bed is a lifting test bed;
the pressure chamber is arranged at the upper part of the test bed and consists of a pressure chamber base, an organic glass cylinder and a top cover with a dowel bar and a G1/4 quick joint; an annular groove is formed in the center of the pressure chamber base, the bottom of the groove is a spiral groove, and a pottery clay plate is embedded in the spiral groove; the upper part of the annular groove and the bottom of the dowel bar are provided with loading caps, and the top of the dowel bar is provided with a displacement meter; the head and the tail of the spiral groove are respectively connected with a valve to ensure that the spiral groove is communicated with the outside;
the thermostat is covered outside the pressure chamber, so that the pressure chamber is in a constant temperature state;
the air pressure system comprises an air compressor and an air pressure pipe, wherein the air compressor is connected with the pressure chamber, and the air pressure pipe is connected with the pressure chamber through a G1/4 quick coupling;
the system for measuring the water discharge comprises a graduated tube and a bubble scouring device, wherein the graduated tube and the bubble scouring device are connected with a valve through a pipe, and bubbles are pressed into the graduated tube by using the bubble scouring device and then discharged;
the control system comprises a computer and a collecting device connected with the computer, and the collecting device is connected with the constant temperature box, the air pressure system, the lifting test bed and the displacement meter.
Further, the test bench by the base, set up elevating platform and stand on the base, set up in the crossbeam at stand top and set up in crossbeam middle part, adjusting screw on the dowel steel and constitute, the test bench be used for laying the pressure chamber, adjusting screw accessible height-adjusting makes between its and the dowel steel in close contact with.
Furthermore, the lifting platform can realize rapid lifting through an automatic lifting system, and the automatic lifting system is connected with a computer through a collecting device; the lifting platform can control the magnitude of each level of load applied by the lifting platform and the time for maintaining the load through a computer.
Furthermore, the pressure chamber is connected with the pressure chamber base through a bolt and is sealed through a sealing ring, a G1/4 quick joint is arranged on the pressure chamber top cover, and the air compressor pressurizes the pressure chamber through an air pressure pipe to enable the sample to be in an unsaturated state.
Furthermore, the upper part of the spiral groove is connected with the clay plate, and the lower part of the spiral groove is connected with the bubble scouring device and the graduated tube through the tubes.
Furthermore, the graduated tube is fixed on the pipe clamping frame and is connected with the spiral groove and the bubble scouring device through a valve. Before the consolidation test, the scale change of the scale pipe after the bubble is discharged is monitored every day, and the balance of the suction force of the sample can be judged to be complete by stable reading. And in the consolidation test, reading the reading of the scale pipe after the bubbles are discharged before the next stage of load is added every time, and obtaining the difference value between the reading of the scale pipe and the reading of the previous stage of load, namely the water discharge of the sample under the stage of load.
Further, the pressure pipe is provided with a pressure regulating valve, a pressure gauge and a steam saturator, and the air compressor can control the air pressure in the pressure chamber through the pressure regulating valve.
Further, the thermostat is internally provided with a temperature sensor and a temperature control system, the temperature sensor and the temperature control system are connected with a computer through a collecting device, the required temperature is set through the computer, the temperature sensor monitors the temperature in the thermostat, and the temperature control system controls the temperature in the thermostat.
Furthermore, the displacement meter is a dial indicator, the displacement meter is connected with the acquisition device, the reading of the displacement meter is automatically read, the reading of the displacement meter is recorded in a computer, and the automatic reading can greatly reduce the error of manual reading.
Furthermore, a plurality of air holes are formed in the loading cap, the loading cap plays a role in force transmission, and pressure/load applied by the lifting platform controlled by the computer is uniformly transmitted to the sample through the force transmission rod and the loading cap.
Compared with the prior art, the utility model has the advantages that the structure is reasonable, the function is various, and the utility model has the following advantages:
1. the pressure chamber is hermetically connected with the base through the sealing ring, then samples with different saturation degrees can be obtained by regulating and controlling the air pressure, various unsaturated consolidation tests can be directly carried out, and the operation is simple and convenient;
2. the pressure chamber is arranged in the thermostat, so that the test temperature can be controlled, and the influence of temperature difference on the test is reduced;
3. the loading device is automatically loaded, the reading is automatic, the automation degree is high, the error caused by artificial reading is greatly reduced, and the sedimentation amount of the sample can be accurately measured;
4. before the consolidation test, the scale change of the scale pipe after the bubbles are discharged is monitored every day, and the balance of the suction force of the sample can be judged to be complete by stable reading, so that the accurate control of the suction force of the sample is realized;
5. before the next stage of load is added, bubbles in the spiral groove are pressed into the graduated tube through the bubble scouring device each time, and the scale difference in the graduated tube for two times is the sample displacement under the stage of load.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the unsaturated consolidometer base of the present invention;
fig. 3 is the schematic view of the structure of the unsaturated consolidation apparatus base of the present invention.
In the figure: 1 test bed base, 2 lifting platform, 3 adjusting screw, 4 upright post, 5 cross beam, 6 valve, 7 clay plate, 8 spiral groove, 9 sample, 10 permeable stone, 11 loading cap, 12 dowel bar, 13 organic glass cylinder, 14 pressure chamber, 15 bolt, 16G1/4 quick connector, 17 barometer, 18 displacement meter, 19 pressure adjusting valve, 20 barotube, 21 air compressor, 22 acquisition device, 23 electric wire or data line, 24 computer, 25 pressure chamber base, 26 bolt hole, 27 sealing ring groove, 28 sealing ring, 29 temperature sensor, 30 thermostat with temperature adjusting function, 31 bubble scouring device, 32 graduated tube, 33 pipe clamping rack, 34 vent, 35 steam saturator, 36 temperature control system, 37G 1/4 screw hole.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The suction control type unsaturated soil consolidation apparatus capable of accurately measuring the water displacement of the sample as shown in fig. 1 comprises a test bed, a pressure chamber 14, a constant temperature box 30, an air pressure system, a water displacement measuring system and a control system;
the test bed is a lifting test bed;
the pressure chamber 14 is arranged at the upper part of the test bed, and the pressure chamber 14 consists of a pressure chamber base 25, an organic glass cylinder 13 and a top cover with a dowel bar 12 and a G1/4 quick coupling 16; as shown in fig. 2 and 3, an annular groove is formed in the center of the pressure chamber base 25, a spiral groove 8 is formed in the bottom of the groove, and a pottery clay plate 7 is embedded in the spiral groove 8; a loading cap 11 is arranged at the upper part of the annular groove and the bottom of the dowel bar 12, and a displacement meter 18 is arranged at the top of the dowel bar 12; the spiral groove 8 is connected with a valve 6 end to enable the spiral groove 8 to be communicated with the outside, and the valve 6 is connected with the pressure chamber base 25 through a G1/4 screw hole 37;
the thermostat 30 is covered outside the pressure chamber 14, so that the pressure chamber 14 is in a constant temperature state;
the pneumatic system comprises an air compressor 21 and a pneumatic tube 20, wherein the air compressor 21 is connected with the pressure chamber 14, and the pneumatic tube 20 is connected with the pressure chamber 14 through a G1/4 quick coupling 16; the air pressure system can be automatically loaded through a computer 24, and the next stage of load can be added for a long time or the next stage of load can be added after the settlement is stable;
the water discharge measuring system comprises a graduated tube 32 and a bubble scouring device 31, wherein the graduated tube 32 and the bubble scouring device 31 are connected with a valve 6 through pipes, and bubbles are pressed into the graduated tube 32 by using the bubble scouring device 31 and then discharged;
the control system comprises a computer 24 and an acquisition device 22 connected with the computer 24, wherein the acquisition device 22 is connected with a constant temperature box 30, an air pressure system, a lifting test bed and a displacement meter 18 through an electric wire or a data wire 23.
Further, the test bench by test bench base 1, set up elevating platform 2 and stand 4 on test bench base 1, set up in crossbeam 5 at stand 4 top and set up adjusting screw 3 on crossbeam 5 middle part, dowel steel 12 and constitute, the test bench be used for laying pressure chamber 14, adjusting screw 3 accessible height-adjusting makes between its and the dowel steel 12 in close contact with.
Further, the lifting platform 2 is quickly lifted through an automatic lifting system, and the automatic lifting system is connected with a computer 24 through a collecting device 22; the lifting platform 2 can control the magnitude of each stage of load applied by the lifting platform and the time for maintaining the load through a computer 24.
Further, the pressure chamber 14 is connected with the pressure chamber base 25 through a bolt 15, and is sealed through a sealing ring 28, the pressure chamber is covered with a G1/4 quick coupling 16, and an air compressor 21 pressurizes the pressure chamber 14 through a pneumatic tube 20, so that the test sample 9 is in an unsaturated state.
Furthermore, the upper part of the spiral groove 8 is connected with the clay plate 7, and the lower part thereof is connected with the bubble scouring device 31 and the graduated tube 32 through pipes.
Furthermore, the graduated tube 32 is fixed on the tube clamping frame 33 and is connected with the spiral groove 8 and the bubble scouring device 31 through the valve 6. Before the consolidation test, the scale change of the scale pipe 32 after the bubble discharge is monitored every day, and the stable reading can judge that the suction force of the sample 9 is balanced and complete. In the consolidation test, before the next stage of load is added each time, the difference between the reading of the scale tube 32 after the air bubbles are discharged and the reading of the previous stage of load is the water discharge amount of the sample 9 under the load of the stage.
Further, the pressure pipe 20 is provided with a pressure regulating valve 19, a pressure gauge 17 and a steam saturator 35, and the air compressor 21 can control the pressure in the pressure chamber 14 through the pressure regulating valve 19.
Further, a temperature sensor 29 and a temperature control system 36 are arranged in the incubator 30, the temperature sensor 29 and the temperature control system 36 are connected with the computer 24 through the acquisition device 22, the required temperature is set through the computer 24, the temperature sensor 29 monitors the temperature in the incubator 30, and the temperature control system 36 controls the temperature in the incubator 30.
Furthermore, the displacement meter 18 is a dial indicator, the displacement meter 18 is connected with the acquisition device 22, the reading of the displacement meter 18 is automatically read, the reading of the displacement meter 18 is recorded in the computer 24, and the automatic reading can greatly reduce the error of manual reading.
Furthermore, a plurality of air holes 34 are formed in the loading cap 11, the loading cap 11 plays a role in force transmission, and pressure/load applied by the computer-controlled lifting platform is uniformly transmitted to the test sample 9 through the force transmission rod 12 and the loading cap 11.
The test bed base 1 is placed on a horizontal table top, the pressure chamber base 25 is flatly placed on the lifting table 2, the valve 6 is opened to fill water into the spiral groove 8, meanwhile, after a certain amount of water is filled on the clay plate 7, the pressure chamber base 25 and the pressure chamber 14 are connected in a sealing mode through the bolt 15 and the sealing ring 28, the bolt 15 is fixed on the bolt hole 26, the sealing ring 28 is arranged on the sealing groove ring 27, and the clay plate 7 is saturated through the G1/4 quick connector 16 and the air pressure pipe 20 under the effect of air pressure.
After the saturation of the pottery clay plate 7 is finished, the pressure chamber 14 is separated from the pressure chamber base 25, the cutting ring sample 9, the filter paper, the permeable stone 10 and the loading cap 11 are sequentially placed on the pottery clay plate 7 of the base, the force transmission rod 12 is slightly abutted to the loading cap 11, meanwhile, the adjusting screw 3 is rotated to apply the load on the force transmission rod 12, the required air pressure is applied to pre-balance the sample through the G1/4 quick connector 16 and the air pressure pipe 20 (the scales after the air bubbles are discharged are read every day through the scale pipe 32, and when the scales are basically unchanged for two days continuously, the balance is basically finished), the displacement meter 18 is installed, and the temperature of the constant temperature box 30 is controlled to be constant through the computer 24.
After the steps are completed, the unsaturated soil consolidation test can be carried out. In the test process, the air pressure is kept unchanged, each level of pre-applied load is set on the computer 24, and the data acquisition device 22 can automatically record the current load and the total settlement at one time. Meanwhile, before the next stage of load is added, the valves 6 on the two sides are opened every day, water is introduced to wash bubbles at the bottom of the pottery clay plate 7, and after the bubbles are discharged from the graduated tube 32, the graduation is read, so that the water discharge amount of the sample under the stage of load can be known.
Claims (10)
1. The utility model provides a but suction control formula unsaturated soil consolidation apparatus of accurate measurement sample displacement which characterized in that: the device comprises a test bed, a pressure chamber, a thermostat, an air pressure system, a water discharge measuring system and a control system;
the test bed is a lifting loading test bed;
the pressure chamber is arranged at the upper part of the test bed and consists of a pressure chamber base, an organic glass cylinder and a top cover with a dowel bar and a G1/4 quick joint; an annular groove is formed in the center of the pressure chamber base, the bottom of the groove is a spiral groove, and a pottery clay plate is embedded in the spiral groove; the upper part of the annular groove and the bottom of the dowel bar are provided with loading caps, and the top of the dowel bar is provided with a displacement meter; the head and the tail of the spiral groove are respectively connected with a valve to ensure that the spiral groove is communicated with the outside;
the thermostat is covered outside the pressure chamber;
the air pressure system comprises an air compressor and an air pressure pipe, wherein the air compressor is connected with the pressure chamber, and the air pressure pipe is connected with the pressure chamber through a G1/4 quick coupling;
the water discharge measuring system comprises a graduated tube and a bubble scouring device, and the graduated tube and the bubble scouring device are connected with a valve through a pipe;
the control system comprises a computer and a collecting device connected with the computer, and the collecting device is connected with the constant temperature box, the air pressure system, the lifting test bed and the displacement meter.
2. The suction control type unsaturated soil consolidometer capable of accurately measuring the water displacement of the sample according to claim 1, wherein: the test bed consists of a base, a lifting platform and a stand column which are arranged on the base, a cross beam arranged at the top of the stand column and adjusting screws arranged in the middle of the cross beam and on a dowel bar.
3. The suction control type unsaturated soil consolidometer capable of accurately measuring the water displacement of the sample according to claim 2, wherein: the lifting platform is quickly lifted through an automatic lifting system, and the automatic lifting system is connected with a computer through a collecting device; the lifting platform can control the magnitude of each level of load applied by the lifting platform and the time for maintaining the load through a computer.
4. The suction control type unsaturated soil consolidometer capable of accurately measuring the water displacement of the sample according to claim 1, wherein: the pressure chamber is connected with the pressure chamber base through a bolt and is sealed through a sealing ring, and a G1/4 quick joint is arranged on the top cover of the pressure chamber.
5. The suction-controlled unsaturated soil consolidometer capable of accurately measuring the water displacement of a sample according to claim 1 or 4, wherein: the upper part of the spiral groove is connected with the argil plate, and the lower part of the spiral groove is connected with the bubble scouring device and the graduated tube through pipes.
6. The suction control type unsaturated soil consolidometer capable of accurately measuring the water displacement of the sample according to claim 1, wherein: the graduated tube is fixed on the pipe clamping frame and is connected with the spiral groove and the bubble scouring device through a valve.
7. The suction control type unsaturated soil consolidometer capable of accurately measuring the water displacement of the sample according to claim 1, wherein: the pressure pipe is provided with a pressure regulating valve, a barometer and a steam saturator, and the air compressor can control the air pressure in the pressure chamber through the pressure regulating valve.
8. The suction control type unsaturated soil consolidometer capable of accurately measuring the water displacement of the sample according to claim 1, wherein: the thermostat is internally provided with a temperature sensor and a temperature control system, and the temperature sensor and the temperature control system are connected with a computer through a collecting device.
9. The suction control type unsaturated soil consolidometer capable of accurately measuring the water displacement of the sample according to claim 1, wherein: the displacement meter is a dial indicator, is connected with the acquisition device and records the reading of the displacement meter in a computer.
10. The suction control type unsaturated soil consolidometer capable of accurately measuring the water displacement of the sample according to claim 1, wherein: the loading cap is provided with a plurality of air holes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020060377.7U CN211905361U (en) | 2020-01-13 | 2020-01-13 | Suction control type unsaturated soil consolidation apparatus capable of accurately measuring sample displacement |
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| CN202020060377.7U CN211905361U (en) | 2020-01-13 | 2020-01-13 | Suction control type unsaturated soil consolidation apparatus capable of accurately measuring sample displacement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176391A (en) * | 2021-03-29 | 2021-07-27 | 中国电建集团西北勘测设计研究院有限公司 | Soil testing device |
| CN113959837A (en) * | 2021-09-15 | 2022-01-21 | 江南大学 | Unsaturated soil consolidation and humidification deformation measurement test device capable of accurately measuring water absorption and water discharge of sample and use method thereof |
-
2020
- 2020-01-13 CN CN202020060377.7U patent/CN211905361U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176391A (en) * | 2021-03-29 | 2021-07-27 | 中国电建集团西北勘测设计研究院有限公司 | Soil testing device |
| WO2022206145A1 (en) * | 2021-03-29 | 2022-10-06 | 中国电建集团西北勘测设计研究院 | Soil testing device |
| CN113959837A (en) * | 2021-09-15 | 2022-01-21 | 江南大学 | Unsaturated soil consolidation and humidification deformation measurement test device capable of accurately measuring water absorption and water discharge of sample and use method thereof |
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