CN102156076A - Method for measuring freeze thawing deformation of one-dimensional lateral limit loaded soil sample - Google Patents
Method for measuring freeze thawing deformation of one-dimensional lateral limit loaded soil sample Download PDFInfo
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- CN102156076A CN102156076A CN 201110070078 CN201110070078A CN102156076A CN 102156076 A CN102156076 A CN 102156076A CN 201110070078 CN201110070078 CN 201110070078 CN 201110070078 A CN201110070078 A CN 201110070078A CN 102156076 A CN102156076 A CN 102156076A
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Abstract
The invention discloses a method for measuring freeze thawing deformation of a one-dimensional lateral limit loaded soil sample by using a testing device. The device comprises a heating water tank 1, a loading framework 8, an evaporator 14, a freeze thawing chamber 17, a sample box 19, a weight 24 and a pressing lever 28. The heating water tank 1 is connected with freeze thawing chamber 17 through a lower water pipe 5 and an upper water pipe 6, the lower water pipe 5 is controlled by a switching valve 3, and the upper water pipe 6 is controlled by a water pump 2 and a switching valve 4. The device is simple to manufacture, has high measurement precision, meets the freezing and thawing requirements of the soil sample, is accurate to control temperature, and can be used for measuring expansion and shrinkage quantity and volume change of various frozen and thawed soils under a vertical load lateral limit pressure environment in the civil engineering.
Description
Technical field
The present invention is a kind of geotechnological method of testing, belongs to building (ground) field of engineering technology.
Background technology
For a long time, frost heave and thaw collapse are the one of the main reasons of cold district, northwest engineering freeze injury problem always.Cyclic process to soil frost heave and thaw collapse has changed soil structures, having destroyed intergranular connection power, soil particle is rearranged, is one of major reason that causes the soil mass property deterioration, especially have the soil body for frozen soil in the cold district and loess etc. than strong constitutive property, all the more so.Soil property structures such as earth dam, dyke, roadbed, side slope produce disaster accidents such as crack, seepage, landslide under long-term frost heave, the influence of thaw collapse cyclical factor, had a strong impact on the normal construction and the safe operation of engineering.Therefore, unusual necessity of the understanding research that the soil body is freezed the ringing cubic deformation rule down of melting down with high temperature at low temperatures.The also comparatively unripe both at home and abroad at present test method that is used for measuring the swell-shrinking deformation rule of the soil body under confining pressure.This application to invent exactly a kind of at the soil body under sharp freezing and high temperature melt environment, the body variable survey method under the pressure at right angle effect.
Summary of the invention
The object of the invention provides a kind of test method that is used for measuring repeated expansion and shrinkage of soil sample, solve the perpendicular displacement amount and the measurement problem of cubic deformation amount of the soil body when expanding repeatedly or shrinking, be particularly useful for soil body freezing expansion and the breathing measurement problem of melting in the contraction process.
Technical solution of the present invention is characterized in that utilizing a kind of test unit measuring repeated expansion and shrinkage of soil sample distortion, and this test unit comprises heating water tank 1, loading frame 8, evaporator 14, freeze thawing chamber 17, pressurization lever 28.Wherein heating water tank 1 is connected with freeze thawing chamber 17 with upper hose 6 by downcomer 5, and downcomer 5 is by controlled valve 3 controls, and upper hose 4 is by water pump 2 and controlled valve 4 controls.Evaporator 14 connects into a cover refrigeration system with cold-producing medium Storage Box 13, compressor 16, condenser 15, cold-producing medium Storage Box 13.Sample box 19 bottoms are placed with permeable stone 12, place sample 20 above the permeable stone 12, put a permeable stone 12 above the sample 20 again, cover permeable stone 12 with top cap 11 then, by 20 pressurizations of 10 pairs of samples of pressuring shaft, when breathing takes place sample 20, can change by vertical displacement meter 9 observed readings.Tygon insulating foam 18 and thermometer 7 are arranged in the freeze thawing chamber 17, and thermometer 7 can be connected computer with vertical displacement meter 9 and realize real-time image data.Pressuring shaft 10 provides pressure at right angle by loading frame 8 by pressurization lever 28 and the counterweight 24 that gim peg 22 connects.Loading frame 8 is made up of rotation axis 23, counterweight 24, big counterweight 27, pressurization lever 28, loading frame 8 is connected with instrument base 21 by gim peg 22, two rotation axiss 23 that drive framework 8 liftings connect by first metal lift hook 25, and counterweight 24 is connected by second metal lift hook 26 with lever 28.
Advantage of the present invention:
The instrument manufacturing is simple, and the measuring accuracy height satisfies that soil sample is freezed, the thaw collapse requirement, and breathing amount and body variable various soil properties are freezed thaw collapse under confining pressure after can be directly measured in the temperature precise control.
The scope of application of the present invention:
The breathing amount of the various soil properties that can be used for running in the civil engineering work and volume change thereof measure, and both have been applicable under the no load pressure free to contract and expand environment to measure, and are applicable to that again the confining pressure environment of vertical load measures down.
Description of drawings:
Fig. 1 is the test unit structural representation that is used to measure repeated expansion and shrinkage of soil sample.Wherein: heating water tank 1, water pump 2, downcomer controlled valve 3, upper hose controlled valve 4, downcomer 5, upper hose 6, thermometer 7, loading frame 8, vertical displacement meter 9, pressuring shaft 10, top cap 11, permeable stone 12, cold-producing medium Storage Box 13, evaporator 14, condenser 15, compressor 16, freeze thawing chamber 17, tygon insulating foam 18, sample box 19, sample 20, instrument base 21, gim peg 22, rotation axis 23, counterweight 24 are arranged.
Fig. 2 is the A-A right view of Fig. 1.Wherein have: gim peg 22, rotation axis 23, counterweight 24, first metal lift hook 25, second metal lift hook 26, big counterweight 27, pressurization lever 28.
Embodiment:
Embodiment: the test method that is used to measure repeated expansion and shrinkage of soil sample under the one-dimensional confining stress condition is as follows:
1. sample is installed: earlier permeable stone 12 is put into sample box 19, put into sample 20 then, put into permeable stone 12 again, the top adds caping cap 11, and pressuring shaft 10 is aimed at top cap 11, counterweight 24 is placed on below second metal lift hook 26, by loading frame 8, make pressuring shaft 10 aim at top cap 11, sample 20 is applied authorised pressure, and vertical displacement meter 9 placed on the top cap 11, reading is made zero;
2. freeze sample: start compressor 16, make cold-producing medium 13 by condenser 15, enter in the evaporator 14, sample 20 is carried out frozen cooling, by the temperature of thermometer 7 control samples 20, treat that temperature reaches testing requirements, close compressor 16, by the measurement of vertical displacement meter 9, can draw the freezing expansion amount of sample 20 under regulation pressure at right angle and temperature;
3. melt sample: start heating water tank 1, open downcomer controlled valve 3, hot water flows in the freeze thawing chamber 17 by downcomer 5, and valve-off 3 then, sample after freezing 20 is heated, after heat is transmitted, as do not reach the temperature of testing requirements, can open upper hose valve 4, open water pump 2, water in the freeze thawing chamber 17 is drawn back heating water tank 1, and valve-off 4 then, again the heating of the water in the water tank 1, and then open valve 3, allow hot water flow in the freeze thawing chamber 17, valve-off 3 heats the sample after freezing 20 again, when treating that thermometer 7 reaches the temperature of testing requirements, can stop heating, open valve 4 simultaneously, start water pump 2, water is drawn back water tank 1, valve-off 4 then, can observe the reading of vertical displacement meter 9 simultaneously, draw the thawing amount of contraction of sample 20 under regulation pressure at right angle and temperature;
4. as the breathing volume change of carrying out behind the sample multigelation measure, can repeating step 2. 3., and read the volume swell-shrinking deformation amount of sample 20 under regulation pressure at right angle and temperature from vertical displacement meter 9.
Claims (1)
1. an one-dimensional confining loads the method for measurement of soil sample freeze thawing deformation, it is characterized in that utilizing a kind of test unit to measure soil sample freeze thawing deformation, this device comprises heating water tank (1), loading frame (8), evaporator (14), freeze thawing chamber (17), pressurization lever (28), heating water tank (1) is connected with freeze thawing chamber (17) with upper hose (6) by downcomer (5), downcomer (5) is by controlled valve (3) control, upper hose (4) is by water pump (2) and controlled valve (4) control, evaporator (14) and cold-producing medium Storage Box (13), compressor (16), condenser (15), cold-producing medium Storage Box (13) connects into a cover refrigeration system, sample box (19) bottom is placed with permeable stone (12), place sample (20) above the permeable stone (12), put a permeable stone (12) above the sample (20) again, use top cap (11) to cover permeable stone (12) then, by pressuring shaft (10) sample (20) is pressurizeed, can pass through vertical displacement meter (9) observed reading when breathing takes place sample (20) changes, tygon insulating foam (18) and thermometer (7) are arranged in the freeze thawing chamber (17), thermometer (7) can be connected computer with vertical displacement meter (9) and realize real-time image data, pressuring shaft (10) provides pressure at right angle by loading frame (8) by pressurization lever (28) and the counterweight (24) that gim peg (22) connects, loading frame (8) is by rotation axis (23), counterweight (24), big counterweight (27), pressurization lever (28) is formed, loading frame (8) is connected with instrument base (21) by gim peg (22), two rotation axiss (23) that drive framework (8) lifting connect by first metal lift hook (25), counterweight (24) is connected by second metal lift hook (26) with pressurization lever (28), utilizes the method for this device measurement soil sample freeze thawing deformation under the one-dimensional confining loading environment as follows:
1. sample is installed: earlier permeable stone (12) is put into sample box (19), put into sample (20) then, put into permeable stone (12) again, the top adds caping cap (11), and pressuring shaft (10) is aimed at top cap (11), counterweight (24) is placed on below second metal lift hook (26), by loading frame (8), make pressuring shaft (10) aim at top cap (11), sample (20) is applied authorised pressure, and vertical displacement meter (9) placed on the top cap (11), reading is made zero;
2. freeze sample: start compressor (16), make cold-producing medium (13) by condenser (15), enter in the evaporator (14), sample (20) is carried out frozen cooling, by the temperature of thermometer (7) control sample (20), treat that temperature reaches testing requirements, close compressor (16), by the measurement of vertical displacement meter (9), can draw the freezing expansion amount of sample (20) under regulation pressure at right angle and temperature;
3. melt sample: start heating water tank (1), open downcomer controlled valve (3), hot water flows in the freeze thawing chamber (17) by downcomer (5), valve-off (3) then, sample after freezing (20) is heated, after heat is transmitted, as do not reach the temperature of testing requirements, can open upper hose valve (4), open water pump (2), water in freeze thawing chamber (17) is drawn back heating water tank (1), and valve-off (4) heats the water in the water tank (1) again then, and then open valve (3), allow hot water flow in the freeze thawing chamber (17), valve-off (3) heats the sample after freezing (20) again, when treating that thermometer (7) reaches the temperature of testing requirements, can stop heating, open valve (4) simultaneously, start water pump (2), water is drawn back water tank (1), valve-off (4) then can be observed simultaneously the reading of vertical displacement meter (9), draws the thawing amount of contraction of sample (20) under regulation pressure at right angle and temperature;
4. as the breathing volume change of carrying out behind the sample multigelation measure, can repeating step 2. 3., and read the volume swell-shrinking deformation amount of sample (20) under regulation pressure at right angle and temperature from vertical displacement meter (9).
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| CN 201110070078 CN102156076B (en) | 2010-03-26 | 2010-03-26 | Method for measuring freeze thawing deformation of one-dimensional lateral limit loaded soil sample |
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| CN 201110070078 CN102156076B (en) | 2010-03-26 | 2010-03-26 | Method for measuring freeze thawing deformation of one-dimensional lateral limit loaded soil sample |
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| CN2010101326240A Division CN101806686B (en) | 2010-03-26 | 2010-03-26 | Testing method used for measuring repeated expansion , shrinkage and deformation of soil sample |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568599A (en) * | 2015-01-19 | 2015-04-29 | 浙江大学 | Vacuum negative pressure/positive pressure/heat combined loading consolidation apparatus |
| CN106501489A (en) * | 2016-12-09 | 2017-03-15 | 长安大学 | Coarse Saline salt is swollen and molten sunken multifunction test device |
| CN107907655A (en) * | 2017-11-09 | 2018-04-13 | 安徽理工大学 | Multifunctional Frozen complex boundary thaw collapse coefficient measuring instrument |
| CN110186809A (en) * | 2019-06-04 | 2019-08-30 | 河北建筑工程学院 | A kind of novel frozen soil rheometer |
| CN111855735A (en) * | 2020-08-06 | 2020-10-30 | 兰州理工大学 | Efficient and accurate measuring device for salt expansion and frost heaving of salt solution |
| CN112083028A (en) * | 2020-10-09 | 2020-12-15 | 中国民航大学 | Frozen soil melting and solidifying test device considering rainfall process |
| CN112362691A (en) * | 2020-10-29 | 2021-02-12 | 辽宁科技大学 | Device and method for detecting coal expansion pressure |
| CN113238026A (en) * | 2021-04-29 | 2021-08-10 | 中山大学 | Tester for freezing and melting soil body |
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| CN101509865A (en) * | 2009-03-25 | 2009-08-19 | 中国科学院地质与地球物理研究所 | Nonsaturated soil hydraulic parameter measuring device and measuring method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1173243A1 (en) * | 1983-11-28 | 1985-08-15 | Предприятие П/Я В-2679 | Process of testing material for long term plasticity |
| GB2220270A (en) * | 1988-07-01 | 1990-01-04 | China Steel Corp | Determination of metal properties during phase transformation |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568599A (en) * | 2015-01-19 | 2015-04-29 | 浙江大学 | Vacuum negative pressure/positive pressure/heat combined loading consolidation apparatus |
| CN104568599B (en) * | 2015-01-19 | 2017-04-12 | 浙江大学 | Vacuum negative pressure/positive pressure/heat combined loading consolidation apparatus |
| CN106501489A (en) * | 2016-12-09 | 2017-03-15 | 长安大学 | Coarse Saline salt is swollen and molten sunken multifunction test device |
| CN107907655A (en) * | 2017-11-09 | 2018-04-13 | 安徽理工大学 | Multifunctional Frozen complex boundary thaw collapse coefficient measuring instrument |
| CN110186809A (en) * | 2019-06-04 | 2019-08-30 | 河北建筑工程学院 | A kind of novel frozen soil rheometer |
| CN111855735A (en) * | 2020-08-06 | 2020-10-30 | 兰州理工大学 | Efficient and accurate measuring device for salt expansion and frost heaving of salt solution |
| CN112083028A (en) * | 2020-10-09 | 2020-12-15 | 中国民航大学 | Frozen soil melting and solidifying test device considering rainfall process |
| CN112083028B (en) * | 2020-10-09 | 2024-04-16 | 中国民航大学 | Frozen soil melting consolidation test device considering rainfall process |
| CN112362691A (en) * | 2020-10-29 | 2021-02-12 | 辽宁科技大学 | Device and method for detecting coal expansion pressure |
| CN112362691B (en) * | 2020-10-29 | 2024-02-13 | 辽宁科技大学 | Device and method for detecting coal expansion pressure |
| CN113238026A (en) * | 2021-04-29 | 2021-08-10 | 中山大学 | Tester for freezing and melting soil body |
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| CN102156076B (en) | 2013-05-15 |
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