CN102221387A - Pressure plate instrument capable of directly measuring volume change of soil sample - Google Patents
Pressure plate instrument capable of directly measuring volume change of soil sample Download PDFInfo
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- CN102221387A CN102221387A CN 201110083551 CN201110083551A CN102221387A CN 102221387 A CN102221387 A CN 102221387A CN 201110083551 CN201110083551 CN 201110083551 CN 201110083551 A CN201110083551 A CN 201110083551A CN 102221387 A CN102221387 A CN 102221387A
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Abstract
The invention discloses a pressure plate instrument capable of directly measuring the volume change of a soil sample. The instrument consists of a pressure container, a horizontal displacement sensor, a vertical displacement sensor, a sensor bracket, a high air inlet value ceramic plate, a base, the soil sample, a drainage volume measuring device and an upper cover of the pressure container, wherein the drainage volume of the soil sample can be measured by the drainage volume measuring device; the horizontal displacement sensor and the vertical displacement sensor which are arranged on the sensor bracket can be used for measuring the deformation of the soil sample in horizontal and vertical directions in the testing process; and the volume and volume strain of the soil sample can be accurately calculated through the deformation value of the soil sample in horizontal and vertical directions.
Description
Technical field
The present invention relates to a kind of pressure plare instrument apparatus that can directly measure the soil sample volume change in the Soil Mechanics and Foundations foundation works.
Background technology
Soil-the water characteristic curve of soil claims water characteristic curve again, is the matric suction of unsaturated soil and the relation curve between gravity water cut, volumetric(al) moisture content, saturation degree or the effective saturation degree.Soil-water characteristic curve is relevant with factors such as the composition of the structure of soil, soil particle, pore size distribution, has reflected the hold ability of soil to moisture, and it is playing the part of important role in the research of unsaturated soil mechanics.Can determine the intensity of unsaturated soil according to soil-water characteristic curve, calculate the body strain and the infiltration coefficient of unsaturated soil, can also be in order to the above moisture distribution situation of estimation ground water level.At present, the instrument of measuring the soil-water characteristic curve of soil both at home and abroad generally all is to adopt with Tempe instrument or volumetric pressure plate instrument, but these two kinds of instruments can not be measured the volume change that soil sample takes place with the increase of suction in the process of soil-water characteristic curve of measuring soil sample, generally initial volume when calculating the volumetric water content of soil sample with soil sample, but the error ratio of volumetric water content of calculating gained like this is bigger, and this error increases along with the increase of soil sample drawdown deformation; In order to reduce the error in this calculating as far as possible, someone adopts the measured volume change of shrinkage test to revise the volumetric water content of soil-water characteristic curve, but the boundary condition of soil sample in Tempe instrument or volumetric pressure plate instrument, there is very big-difference in the situation of soil sample in stress state and stress path and the shrinkage test, the distortion of soil sample is different with body strain in two kinds of tests, therefore, also there is significant limitation in the volumetric water content that adopts the measured volume change of shrinkage test to revise soil-water characteristic curve, and this problem does not also have good solution at present.
Summary of the invention
The volumetric pressure plate instrument of soil-water characteristic curve of solving present mensuration soil sample the objective of the invention is: for can not be measured the volume change that soil sample takes place with the increase of suction in process of the test, thereby can not accurately calculate the deficiency of soil sample volumetric water content, the invention provides a kind of volumetric pressure plate instrument apparatus that can directly measure the soil sample volume change, can measure the volume change of soil sample in process of the test easily, can accurately calculate the volume change and the strain of soil sample under the different suction situations, and volumetric water content, make that the test determination result is more accurate.
For achieving the above object, the present invention can directly measure the volumetric pressure plate instrument apparatus of soil sample volume change and be made up of pressure vessel, pressure vessel loam cake, high air-entry value ceramic wafer, horizontal displacement sensors, perpendicular displacement sensor, sensor wire, displacement sensor bracket, base; Base is provided with groove and the spiral slot that high air-entry value ceramic wafer is installed, and is connected with the displacement of volume measuring equipment by pipeline; Horizontal displacement sensors, perpendicular displacement sensor are installed on the displacement sensor bracket, and displacement sensor bracket can be installed on the base, and is placed in the pressure vessel together.
At first be that one of processing can be satisfied and holds base, soil sample, horizontal displacement sensors, perpendicular displacement sensor, displacement sensor bracket, and having the pressure vessel of sealable sensor cable hole, osculum, air admission hole, osculum, drainpipe can be by connecting the sealing of flexible pipe connection and assurance and pressure vessel binding site.The size of pressure vessel is determined according to the size and the testing requirements of soil sample, can change the high air-entry value ceramic wafer of different size according to the requirement of the character of soil sample and test on base, the range of horizontal displacement sensors and perpendicular displacement sensor and precision are determined according to the requirement of test.
High air-entry value ceramic wafer 11 is installed on the base 12 in apparatus of the present invention, there is spiral slot 13 to link to each other on the base 12 with osculum 14, osculum 14 is connected with drainpipe 16 by scupper hose 15, drainpipe 16 is connected with displacement of volume measuring equipment 19 again, soil sample 6 is placed on the high air-entry value ceramic wafer 11, and the volume of soil sample 6 drainage waters just can be measured by displacement of volume measuring equipment 19; Displacement sensor bracket 9 is fixed on the base 12, horizontal displacement sensors 7 and perpendicular displacement sensor 8 are installed on the displacement sensor bracket 9, the level that horizontal displacement sensors 7 and perpendicular displacement sensor 8 can measure soil sample 6 to vertical to distortion, by soil sample 6 levels to vertical to deformation values just can calculate the volume and the volume change of soil sample 6.Thereby realized measuring in the process of the test purpose of soil sample volume and volume change easily.
Description of drawings
Fig. 1 is a kind of pressure plare instrument apparatus figure that can directly measure the soil sample volume change.
Fig. 2 is the base and the displacement sensor bracket planimetric map of cylindrical pressure vessel.
Fig. 3 is the A-A sectional view of Fig. 2.
As shown in the figure: pressure vessel 1, pressure vessel loam cake 2, bolt 3, pressure vessel loam cake handle 4, O-ring seals 5, soil sample 6, horizontal displacement sensors 7, perpendicular displacement sensor 8, sensor stand 9, sensor cable 10, high air-entry value ceramic wafer 11, base 12, spiral slot 13, osculum 14, connection flexible pipe 15, drainpipe 16, sensor cable hole 17, air admission hole 18, displacement of volume measuring equipment 19.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.Fig. 1 is the pressure plare instrument apparatus figure that can directly measure volume change that the present invention adopts the cylinder type pressure vessel, before testing, earlier used soil sample 6 is carried out suitable processing and necessary soil nature parametric measurement.
When need measuring the soil of soil sample 6-water characteristic curve, elder generation is according to the character and the testing requirements of soil sample 6, select the high air-entry value ceramic wafer 11 and suitable horizontal displacement sensors 7, the perpendicular displacement sensor 8 of range of appropriate size, high air-entry value ceramic wafer 11 is installed on base 12, saturated by suitable method, put into pressure vessel 1 then, with connecting flexible pipe 15 osculum on the base 12 14 and drainpipe 16 are connected, drainpipe and displacement of volume measuring equipment 19 connect.Soil sample 6 is placed on the high air-entry value ceramic wafer 11 successively again, displacement sensor bracket 9 is fixed on the base 12, horizontal displacement sensors 7 and perpendicular displacement sensor 8 are installed on the displacement sensor bracket 9, the method of taking to suit make level that horizontal displacement sensors 7 and perpendicular displacement sensor 8 can measure soil sample 6 to vertical to distortion, sealing is drawn and guaranteed to displacement transducer cable 10 from sensor cable hole 17.After being ready to, by pressure vessel loam cake handle 4 pressure vessel loam cake 2 is placed on the pressure vessel 1, and between pressure vessel 1 and pressure vessel loam cake 2, place O-ring seals 5, with bolt 3 pressure vessel 1 is connected closely with pressure vessel loam cake 2 again, in case leak-stopping gas.
Read the initial volume value of draining by displacement of volume measuring equipment 19, the initial reading of recording level displacement transducer 7 and perpendicular displacement sensor 8.
By air admission hole 18, progressively in pressure vessel 1, apply air pressure stage by stage according to predetermined testing program, measure the displacement of volume of soil sample 6 simultaneously by displacement of volume measuring equipment 19, measure the distortion of soil samples 6 by horizontal displacement sensors 7 and perpendicular displacement sensor 8 in level and vertical direction, by soil sample 6 levels to vertical to distortion just can calculate the volume and the volume change of soil sample 6.
The pressure plare instrument apparatus that the present invention can directly measure volume change can be implemented in the volume size that directly records soil sample 6 in the process of mensuration soil-water characteristic curve, thereby realized accurately obtaining the volume and the bulk strain of soil sample 6 in the process of the test, made the soil-water characteristic curve that records more realistic.And it is simple in structure, easy to operate.
Claims (4)
1. the pressure plare instrument that can directly measure the soil sample volume change mainly is made up of pressure vessel, horizontal displacement sensors, perpendicular displacement sensor, sensor stand, high air-entry value ceramic wafer, base, soil sample, displacement of volume measuring equipment, pressure vessel loam cake; It is characterized in that high air-entry value ceramic wafer (11) is installed on the base (12), there is spiral slot (13) to link to each other on the base (12) with osculum (14), osculum (14) is connected with drainpipe (16) by scupper hose (15), drainpipe (16) is connected with displacement of volume measuring equipment (19) again, soil sample (6) is placed on the high air-entry value ceramic wafer (11), and the volume of soil sample (6) drainage water just can be measured by displacement of volume measuring equipment (19); Displacement sensor bracket (9) is fixed on the base (12), horizontal displacement sensors (7) and perpendicular displacement sensor (8) are installed on the displacement sensor bracket (9), the level that horizontal displacement sensors (7) and perpendicular displacement sensor (8) can measure soil sample (6) to vertical to distortion, by soil sample (6) level to vertical to deformation values just can calculate the volume and the volume change of soil sample (6).
2. a kind of pressure plare instrument that can directly measure the soil sample volume change according to claim 1, it is characterized in that sensor stand (9), horizontal displacement sensors (7) and perpendicular displacement sensor (8) can dismounting, and can be according to the adjusted size horizontal displacement sensors (7) and the position of perpendicular displacement sensor (8) on sensor stand (9) of soil sample (6).
3. a kind of pressure plare instrument that can directly measure the soil sample volume change according to claim 1 is characterized in that changing according to the size of soil sample (6) and testing requirements the horizontal displacement sensors (7) and the perpendicular displacement sensor (8) of different ranges and precision.
4. a kind of pressure plare instrument that can directly measure the soil sample volume change according to claim 1, it is characterized in that can be according to the character of soil sample (6) and the high air-entry value ceramic wafer (11) of testing requirements replacing different size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110083551 CN102221387B (en) | 2011-04-02 | 2011-04-02 | Pressure plate instrument capable of directly measuring volume change of soil sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110083551 CN102221387B (en) | 2011-04-02 | 2011-04-02 | Pressure plate instrument capable of directly measuring volume change of soil sample |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102221387A true CN102221387A (en) | 2011-10-19 |
| CN102221387B CN102221387B (en) | 2013-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110083551 Expired - Fee Related CN102221387B (en) | 2011-04-02 | 2011-04-02 | Pressure plate instrument capable of directly measuring volume change of soil sample |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305845A (en) * | 2011-07-28 | 2012-01-04 | 河北建设勘察研究院有限公司 | Method for rapidly detecting area unsaturated soil shearing strength |
| CN103713109A (en) * | 2013-12-04 | 2014-04-09 | 北京交通大学 | Temperature-control volume change apparatus |
| CN103743882A (en) * | 2013-12-23 | 2014-04-23 | 石家庄铁道大学 | Device for measuring air entry value of unsaturated soil |
| CN106596328A (en) * | 2017-01-25 | 2017-04-26 | 浙江工业大学 | Portable soil water content tester with sensor |
| CN106768153A (en) * | 2016-12-29 | 2017-05-31 | 中国人民解放军63926部队 | A kind of slurry consolidation cubical contraction test device and method of testing |
| CN109655598A (en) * | 2018-12-04 | 2019-04-19 | 三峡大学 | A kind of high-pressure solid bentonite heat-water-force coupling action simulation testing instrument |
| CN113702237A (en) * | 2021-08-23 | 2021-11-26 | 中国地质大学（武汉） | Soil-water characteristic curve testing device and testing method based on ceramic reference block |
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| DE19909443A1 (en) * | 1999-03-04 | 2000-09-07 | Giesa Ges Fuer Ind Elektronik | Detector for continuously determining volume of sample in closed test space has bell-shaped container for sealing-fluid and connector for level regulator |
| CN1614418A (en) * | 2003-11-04 | 2005-05-11 | 哈尔滨工业大学 | Automatic measuring equipment for concrete volume changing amount |
| CN2700883Y (en) * | 2004-06-03 | 2005-05-18 | 余维初 | Non-contact high temperature and high pressure intelligent expanding instrument |
| WO2005065411A2 (en) * | 2003-12-31 | 2005-07-21 | Saudi Arabian Oil Company | Test apparatus for direct measurement of expansion and shrinkage of oil well cements |
| CN101032889A (en) * | 2006-02-15 | 2007-09-12 | 精工爱普生株式会社 | Liquid container |
| CN101806686A (en) * | 2010-03-26 | 2010-08-18 | 中国科学院地质与地球物理研究所 | Testing apparatus used for measuring repeated expansion and shrinkage of soil sample and use method thereof |
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2011
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Patent Citations (6)
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| DE19909443A1 (en) * | 1999-03-04 | 2000-09-07 | Giesa Ges Fuer Ind Elektronik | Detector for continuously determining volume of sample in closed test space has bell-shaped container for sealing-fluid and connector for level regulator |
| CN1614418A (en) * | 2003-11-04 | 2005-05-11 | 哈尔滨工业大学 | Automatic measuring equipment for concrete volume changing amount |
| WO2005065411A2 (en) * | 2003-12-31 | 2005-07-21 | Saudi Arabian Oil Company | Test apparatus for direct measurement of expansion and shrinkage of oil well cements |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305845A (en) * | 2011-07-28 | 2012-01-04 | 河北建设勘察研究院有限公司 | Method for rapidly detecting area unsaturated soil shearing strength |
| CN102305845B (en) * | 2011-07-28 | 2014-09-24 | 河北建设勘察研究院有限公司 | Method for rapidly detecting area unsaturated soil shearing strength |
| CN103713109A (en) * | 2013-12-04 | 2014-04-09 | 北京交通大学 | Temperature-control volume change apparatus |
| CN103713109B (en) * | 2013-12-04 | 2015-09-09 | 北京交通大学 | Temperature control body becomes instrument |
| CN103743882A (en) * | 2013-12-23 | 2014-04-23 | 石家庄铁道大学 | Device for measuring air entry value of unsaturated soil |
| CN103743882B (en) * | 2013-12-23 | 2016-01-20 | 石家庄铁道大学 | A kind of unsaturated soil air-entry value determinator |
| CN106768153A (en) * | 2016-12-29 | 2017-05-31 | 中国人民解放军63926部队 | A kind of slurry consolidation cubical contraction test device and method of testing |
| CN106596328A (en) * | 2017-01-25 | 2017-04-26 | 浙江工业大学 | Portable soil water content tester with sensor |
| CN106596328B (en) * | 2017-01-25 | 2023-09-05 | 浙江工业大学 | Portable soil moisture content tester with sensor |
| CN109655598A (en) * | 2018-12-04 | 2019-04-19 | 三峡大学 | A kind of high-pressure solid bentonite heat-water-force coupling action simulation testing instrument |
| CN113702237A (en) * | 2021-08-23 | 2021-11-26 | 中国地质大学（武汉） | Soil-water characteristic curve testing device and testing method based on ceramic reference block |
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| Publication number | Publication date |
|---|---|
| CN102221387B (en) | 2013-03-06 |
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Granted publication date: 20130306 Termination date: 20210402 |