CN103335912A - High-precision soil-water characteristic curve automatic measuring system - Google Patents
High-precision soil-water characteristic curve automatic measuring system Download PDFInfo
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- CN103335912A CN103335912A CN2013102878374A CN201310287837A CN103335912A CN 103335912 A CN103335912 A CN 103335912A CN 2013102878374 A CN2013102878374 A CN 2013102878374A CN 201310287837 A CN201310287837 A CN 201310287837A CN 103335912 A CN103335912 A CN 103335912A
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Abstract
The invention discloses a high-precision soil-water characteristic curve automatic measuring system comprising a gas pressure supplying unit, a pressure chamber, a draining weighing system and a measurement control system. A flushing apparatus with a spiral groove is additionally arranged at the bottom of the pressure chamber, so that influences of bubbles in a drainpipe on variation of sample displacement volume are eliminated; a GDS volume pressure control device is used as the gas pressure supplying unit, so that the precision and the intelligentization degree of pressure controlling are improved significantly; LabVIEW is used for encoding virtual equipment control interface, a controlling device and a monitoring device are combined organically, complete automation of the whole measuring process is realized, so that labor cost of the measuring process is decreased, and work efficiency is increased significantly. The high-precision soil-water characteristic curve automatic measuring system is simple, and production and assembly cost is low.
Description
Technical field
The invention belongs to the Geotechnical Engineering technical field, relate to the experimental test of unsaturated soil soil water characteristic curve, be specially a kind of high precision soil water characteristic curve automatic measurement system.
Background technology
In the unsaturated soil theory of mechanics, the relation curve between native suction and volumetric water content or the saturation degree is defined as native water characteristic curve.This curve can reflect many critical natures of the soil body, as perviousness, body change, intensity, stress state etc.Therefore, the native water characteristic curve that obtains the soil body by the means of test is vital for every physico mechanical characteristic of grasping unsaturated soil.
The widespread use in current this field be Tempe instrument method of testing, this method be applicable to the test matric suction up to the dehumidification curve under the 100kPa situation.Its specific practice is: saturated soil sample is fully contacted with saturated high air-entry value potter's clay plate, and the base plate under the potter's clay plate is provided with the drainpipe that communicates with atmosphere, for the usefulness of soil sample draining, and guarantees that the soil sample pore water pressure is 0.Apply certain air pressure by high pressure air to the container that soil sample is housed, by tensimeter and air pressure regulator control pore air pressure.The compressed air pressure value that tensimeter is read is currently applied matric suction value just.Under the matric suction effect that adds, the soil sample draining is to reach the suction equalization of soil sample inside.When the displacement of volume of soil sample no longer changes, the matric suction that shows soil sample inside reaches balance with the matric suction that applies, the compressed air pressure value that tensimeter records is the matric suction value of current soil sample just, resurveys by weighing test specimen and instrument simultaneously and decides the variation of this stage soil sample water cut.By pressure-regulating valve rising air pressure, repeat aforesaid operations then.After having applied afterbody air pressure, take out sample, measure the sample water cut by oven drying method, the sample of measuring according to above-mentioned steps weighs moisture content value corresponding under the different suction values of inverse with instrument, and draws out dryer section soil water characteristic curve in conjunction with its corresponding steady pressure meter reading (matric suction).
Adopt said method and testing of equipment soil water characteristic curve to have following drawback:
1, the control of pore air pressure realizes by tensimeter and air pressure regulator, thereby the precision of control is not high, generally about 10kPa.
2, can't avoid being dissolved in water mesoporosity gas through high air-entry value potter's clay plate to the influence of this phenomenon of external diffusion to test result.
3, in test process, need the repeatedly gentle pressure gauge reading in reading and recording sky, after reaching balance, judgement suction also to utilize air pressure adjustment valve regulation air pressure, the time that whole test period continues is longer, and rely on fully and manually control, therefore need to consume a large amount of labours, utilize the reading of naked eyes also can reduce the accuracy of test result for a long time.
Therefore 4, the price of the type testing apparatus is generally higher on the market, and it is bigger to utilize this method to carry out the cost of experimental test.
Summary of the invention
Purpose of the present invention provides a kind of high precision soil water characteristic curve automatic measurement system, can overcome the defective of existing measurement mechanism and method, increase the precision of measuring, avoided the influence of diffusion bubble to test result, thus the efficient and the test result accuracy that have improved experimental test greatly.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of high precision soil water characteristic curve automatic measurement system, and this system comprises: atmospheric pressure source of supply, pressure chamber, draining Weighing system and Measurement and Control System;
Described atmospheric pressure source of supply is connected with the pressure chamber, for the pressure chamber provides gas pressure source;
Be provided with air admission hole in the described pressure chamber from top to bottom, be used for to place sample to be tested cavity, be used for fixedly groove and the spiral goove bath groove of potter's clay plate, the inner of described spiral goove bath groove is provided with water inlet, outer end connection freeing port;
Described draining Weighing system comprises weigh scale and the moisture content receiving flask that arranges on it, and the moisture content receiving flask is connected to freeing port by drainpipe;
Described Measurement and Control System comprises the PC that is connected by Serial Port Line with atmospheric pressure source of supply and weigh scale.
Also be provided with the bubble gathering-device in the described draining Weighing system, comprise tank, exhaust gas bubble pipe road and be inverted in the interior bubble receiving flask of tank, the stage casing of drainpipe is provided with three-way valve, and an end in exhaust gas bubble pipe road connects three-way valve, and the other end places in the bubble receiving flask.
Also be provided with bottle stopper on the described moisture content receiving flask, drainpipe passes bottle stopper and enters in the bottle, also is provided with on the bottle stopper in the feasible bottle of needle point to communicate with atmosphere.
Described atmospheric pressure source of supply is GDS volumetric pressure controller, and it is connected to the air admission hole of pressure chamber by pipeline.
Described pressure chamber is cylindrical-shaped structure, adopts organic glass to make.
The pressurized air that utilizes tensimeter and air pressure regulator regulation and control compressor to provide in atmospheric pressure source of supply of the present invention and the traditional test macro is different as gas pressure source, and this system adopts GDS volumetric pressure controller to control the source as atmospheric pressure, and its advantage is:
1) air pressure control accuracy height.It adopts advanced closed-loop path microprocessor controlled pressure, can regulate pressure and be accurate to 1kPa, and traditional tensimeter and air pressure regulator control accuracy is generally about 10kPa.
2) automaticity height.Have high speed USB 2.0 compatibility interfaces, can dock with PC and utilize program realization PC automatic pressure control and read force value.
Atmospheric pressure source of supply of the present invention is that sample to be tested applies air pressure by the air admission hole of pressure chamber, make sample under this force value, dewater, the moisture of sloughing enters spiral goove bath groove after seeing through the groove that is placed with high air-entry value potter's clay plate, enter the moisture content receiving flask by drainpipe again, the quality of weighing drainage water.In addition, because the water-soluble back of gas is easy to generate bubble to external diffusion in the pressure chamber, can exert an influence to test findings, spiral goove bath groove is set in this pressure chamber, and wash by water the inner of groove of spiral goove connected water inlet, the outer end connects freeing port, when sample when the suction of a certain force value soil reaches balance, water inlet can be connected the water source, water and the bubble of spiral goove being washed by water in the groove by drainpipe enter in the bubble gathering-device, the displacement of volume variable quantity is revised, thereby eliminated the influence to sample displacement of volume variable quantity when measuring of the interior bubble of drainpipe.
In addition, Measurement and Control System of the present invention comprises the PC that is connected by Serial Port Line with atmospheric pressure source of supply and weigh scale, PC adopts LabVIEW establishment virtual instrument control interface, automatically control by automatic data collection and atmospheric pressure in the realization test process after the self-defined test condition of control panel, it is the core that realizes the whole test process full-automation.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of pressure chamber.
Fig. 3 is the A-A face cut-open view of Fig. 2.
Fig. 4 is the workflow diagram of TT﹠C system of the present invention.
Embodiment
As Fig. 1-shown in Figure 4, the present invention includes: atmospheric pressure source of supply 1, pressure chamber 2, draining Weighing system and Measurement and Control System;
Described atmospheric pressure source of supply 1 is connected with pressure chamber 2, for the pressure chamber provides gas pressure source;
Be provided with air admission hole 21 in the described pressure chamber 2 from top to bottom, be used for to place sample to be tested cavity 22, be used for fixedly groove 23 and the spiral goove bath groove 24 of potter's clay plate, the inner of described spiral goove bath groove 24 connects water inlet 25, outer end connection freeing port 26;
Described draining Weighing system comprises weigh scale 3 and the moisture content receiving flask 4 that arranges on it, and moisture content receiving flask 4 is connected to freeing port 26 by drainpipe 41;
Described Measurement and Control System comprises the PC 7 that is connected by the RS232 serial ports with atmospheric pressure source of supply 1 and weigh scale 3.
Also be provided with bubble gathering-device 5 in the described draining Weighing system, comprise tank 51, exhaust gas bubble pipe road 53 and be inverted in the interior bubble receiving flask 52 of tank, the stage casing of drainpipe 41 is provided with three-way valve 6, and an end in exhaust gas bubble pipe road 53 connects three-way valve 6, and the other end places in the bubble receiving flask 52.
Also be provided with bottle stopper 42 on the described moisture content receiving flask 4, drainpipe 41 passes bottle stopper 42 and enters in the bottle, also is provided with on the bottle stopper 42 in the feasible bottle of needle point to communicate with atmosphere.
Described atmospheric pressure source of supply 1 is GDS volumetric pressure controller, and it is connected to the air admission hole 21 of pressure chamber 2 by pipeline.
Described pressure chamber 2 is cylindrical-shaped structure, adopts organic glass to make.The air admission hole aperture at its top is 5mm, and cavity is radius 27mm, and high 21mm's is cylindric, is used for laying sample to be tested, and the height of groove is 8mm, and radius is 21.5mm, is used for the potter's clay plate of fixing high air-entry value.For the degree of depth is 3mm, radius is 4mm spiral goove bath groove under the groove.
It is the plum Teller PL301 balance of 0.001g that described balance 3 adopts weighing precision.
Measurement and Control System of the present invention adopts LabVIEW establishment virtual instrument control interface, automatically control by automatic data collection and atmospheric pressure in the realization test process after the self-defined test condition of control panel, it is the core that realizes the whole test process full-automation.The workflow of whole TT﹠C system as shown in Figure 5.
Illustrate testing process below:
At first high air-entry value potter's clay plate and sample to be tested are changed over to respectively in the pressure chamber, fill with water in the groove 24 of then spiral goove being washed by water, finish preliminary work.
Input air pressure loading environment on virtual instrument control interface: initial gas pressure value 5kPa, increment gradient 1kPa, end of a period atmospheric pressure value 50kPa.Import criterion simultaneously: the balance decision content is 0.005g, and reading is spaced apart 10 minutes, and distinguish of system is spaced apart 12 hours.Can judge the soil sample suction equalization condition that reaches when namely the balance reading variation is less than or equal to 0.005g in 12 hour time interval.During the test beginning, GDS volumetric pressure controller applies the initial gas pressure value of 5kPa, saturated soil sample begins dehydration under the effect of this force value, the moisture of sloughing sees through high air-entry value potter's clay plate and collects flask by the moisture that the drainpipe transportation enters in the draining Weighing system, high precision balance instant playback moisture is collected the mass change of flask, and every 10 minutes its value is passed to the control interface.At the 12nd hour, system automatically will be this moment mass value and the 0th hour mass value compare, if its difference is less than 0.005g, system judges that the suction of soil in the pressure chamber reaches balance, and records balance reading and the atmospheric pressure value in this moment in the data acquisition table automatically.System controls GDS volumetric pressure controller immediately and applies next stage air pressure.In this test process, the bubble for fear of the water-soluble back of pressure indoor gas to external diffusion needs regularly to utilize the bath groove that the diffusion bubble in the drainpipe is poured the bubble gathering-device to the influence of test result.
Namely when sample when the suction of a certain force value soil reaches balance, water inlet 25 can be connected the water source, water and the bubble of spiral goove being washed by water in the groove by drainpipe 41 enter in the bubble gathering-device 5, the displacement of volume variable quantity is revised, thereby eliminated the influence to sample displacement of volume variable quantity when measuring of the interior bubble of drainpipe.
The present invention has set up the spiral goove flushometer owing to adopted above technical scheme in the bottom, pressure chamber, thereby has eliminated the influence of the interior bubble of drainpipe to sample displacement of volume variable quantity; Adopt GDS volumetric pressure controller as the atmospheric pressure supply source, increased air pressure control accuracy and intelligent pressure control degree to a great extent; Employing LabVIEW establishment virtual instrument control interface will be regulated and control and monitoring equipment organically combines, and realize the full-automation of whole test process, thereby reduce labour's consumption in the test process, increase work efficiency greatly; Whole system is simple in structure, makes with assembly cost lower.
Claims (5)
1. a high precision soil water characteristic curve automatic measurement system is characterized in that this system comprises: atmospheric pressure source of supply (1), pressure chamber (2), draining Weighing system and Measurement and Control System;
Described atmospheric pressure source of supply (1) is connected with pressure chamber (2), for the pressure chamber provides gas pressure source;
Be provided with air admission hole (21) in the described pressure chamber (2) from top to bottom, be used for to place sample to be tested cavity (22), be used for fixedly the groove of potter's clay plate (23) and the spiral goove groove (24) of washing by water, the inner of described spiral goove bath groove (24) connects water inlet (25), and the outer end connects freeing port (26);
The moisture content receiving flask (4) that described draining Weighing system comprises weigh scale (3) and arranges on it, moisture content receiving flask (4) is connected to freeing port (26) by drainpipe (41);
Described Measurement and Control System comprises the PC (7) that is connected by Serial Port Line with atmospheric pressure source of supply (1) and weigh scale (3).
2. high precision according to claim 1 soil water characteristic curve automatic measurement system, it is characterized in that: also be provided with bubble gathering-device (5) in the described draining Weighing system, comprise tank (51), exhaust gas bubble pipe road (53) and be inverted in the interior bubble receiving flask (52) of tank, the stage casing of drainpipe (41) is provided with three-way valve (6), one end in exhaust gas bubble pipe road (53) connects three-way valve (6), and the other end places in the bubble receiving flask (52).
3. high precision according to claim 1 soil water characteristic curve automatic measurement system, it is characterized in that: also be provided with bottle stopper (42) on the described moisture content receiving flask (4), drainpipe (41) passes bottle stopper (42) and enters in the bottle, also is provided with on the bottle stopper (42) in the feasible bottle of needle point to communicate with atmosphere.
4. high precision according to claim 1 soil water characteristic curve automatic measurement system, it is characterized in that: described atmospheric pressure source of supply (1) is GDS volumetric pressure controller, and it is connected to the air admission hole (21) of pressure chamber (2) by pipeline.
5. high precision according to claim 1 soil water characteristic curve automatic measurement system, it is characterized in that: described pressure chamber (2) are cylindrical-shaped structure, adopt organic glass to make.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104950093A (en) * | 2014-03-28 | 2015-09-30 | 韩国地质资源研究院 | Apparatus for measuring suction stress of unsaturated soil |
| CN108489791A (en) * | 2018-06-20 | 2018-09-04 | 三峡大学 | Aqueous vapor automatic separating apparatus and application method in a kind of pipeline |
| CN112485131A (en) * | 2020-11-11 | 2021-03-12 | 华能澜沧江水电股份有限公司 | Unsaturated shear strength parameter test device and unsaturated shear strength parameter test method for soil-rock mixture |
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| CN102426151A (en) * | 2011-09-06 | 2012-04-25 | 三峡大学 | Multifunctional soil-water characteristic curve tester |
| CN203324134U (en) * | 2013-07-09 | 2013-12-04 | 三峡大学 | High-precision soil-water characteristic curve automatic measuring system |
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| CN102426151A (en) * | 2011-09-06 | 2012-04-25 | 三峡大学 | Multifunctional soil-water characteristic curve tester |
| CN203324134U (en) * | 2013-07-09 | 2013-12-04 | 三峡大学 | High-precision soil-water characteristic curve automatic measuring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104950093A (en) * | 2014-03-28 | 2015-09-30 | 韩国地质资源研究院 | Apparatus for measuring suction stress of unsaturated soil |
| CN108489791A (en) * | 2018-06-20 | 2018-09-04 | 三峡大学 | Aqueous vapor automatic separating apparatus and application method in a kind of pipeline |
| CN112485131A (en) * | 2020-11-11 | 2021-03-12 | 华能澜沧江水电股份有限公司 | Unsaturated shear strength parameter test device and unsaturated shear strength parameter test method for soil-rock mixture |
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Application publication date: 20131002 |