CN105544494A - Temperature-controllable salt leaching-adding soil test device and method for testing soil sample by using same - Google Patents

Temperature-controllable salt leaching-adding soil test device and method for testing soil sample by using same Download PDF

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CN105544494A
CN105544494A CN201610067811.2A CN201610067811A CN105544494A CN 105544494 A CN105544494 A CN 105544494A CN 201610067811 A CN201610067811 A CN 201610067811A CN 105544494 A CN105544494 A CN 105544494A
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soil sample
salt
soil
water
tube
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CN105544494B (en
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牛玺荣
刘宏
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Shanxi University
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Shanxi University
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00Investigation of foundation soil in situ
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00Investigation of foundation soil in situ
    • E02D1/02Investigation of foundation soil in situ before construction work
    • E02D1/022Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
    • E02D1/025Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil combined with sampling

Abstract

The invention relates to a temperature-controllable salt leaching-adding soil test device and a method for testing a soil sample by using the same. The invention mainly aims to solve the technical problem in a current quantitative loess research method that great error exists between test data and an engineering entity. The technical scheme adopted by the invention is characterized in that the temperature-controllable salt leaching-adding soil test device consists of a soil sample barrel, a temperature control system, a salt leaching-adding system, a pressuring device and a data acquisition system. The method for testing the soil sample by using the device comprises the following steps: 1) the moisture content and the soluble salt content of the soil sample are tested; 2) the soil sample is charged into the soil sample barrel; 3) weight is applied to the pressuring plate; 4) the soil sample is heated; 5) a salt solution or water is added to the soil sample; 6), 7) and 8) the temperature is raised, lowered and then is raised, and the deformation situation of the soil sample is recorded; 9) distilled water is added to the soil sample with a water (salt) supplying container, and the deformation situation of the soil sample is recorded; 10) discharged water is collected with a collection container; the conductivity of the discharged water is tested; and the deformation situation of the soil sample is recorded.

Description

The method of salt soil experimental rig and test soil sample thereof is washed-mended to a kind of controllable temperature
Technical field
The invention belongs to geotechnical testament technical field, be specifically related to a kind of method that salt soil experimental rig and test soil sample thereof were washed-mended to controllable temperature, especially dynamic observation soil is in temperature and the dynamic change of washing-mending moisture under the dual ambient influnence of salt, salinity, temperature and distortion.
Background technology
In China's the distributional region of the Loess mileage in highway open to traffic, the section of about 65% is distributed in Collapsible Loess District, because early stage loess subgrade Treating technology level is limited, add the operating environment that extreme climate (as heavy showers) that greenhouse effect cause and the human factor that developing agricultural is facilitated (intrusion as seasonal irrigation and external salinity thereof) change Highways ', make roadbed be in strong increase and decrease all the time wet and wash in the operation state of benefit salt circulation, finally cause subgrade soils series of physical mechanics parameter to there occurs essence to change, cause roadbed and year by year sink deformation occurs, the traffic capacity and the traffic safety of highway are had a strong impact on.
The historical origin of research Loess Collapsibility mechanism for a long time, numerous scholar is from Origin of Loess, the change of circumstances, the different angles such as microtexture, adopt hollow billet hypothesis, dissolved salt hypothesis, colloid deficiency is said, moisture film wedging is said, under-compacted is theoretical, structure theory scheduling theory has annotated the inherent mechanism of Loess Collapsibility, but there is different disputes between different annotation, such as, some scholars think that loess exists multilevel collapsibility, what have not thinks to there is multilevel collapsibility, what have thinks that settlement by soaking is reversible process, what have thinks that settlement by soaking is irreversible, particularly the Strength and Dformation index of loess under the wet ringing of increase and decrease is not had a deep understanding, as everyone knows, in loess, the existence of lyotropic salt is the necessary condition causing its Collapsing Deformation, as long as its soluble salt content of loess that Loess Collapsibility higher grade is general higher, the supply of salinity and the impact of leaching on Loess Collapsibility can not be ignored, and existing highway engineering is put into practice sufficient proof and washed the depression disease of mending salt ringing and Canal in Loess Area roadbed can be caused serious, in addition, when water in soil divide reach a certain limit value time, soil temperature plays control action by the Collapsing Deformation of loess, particularly when temperature in the soil body reduce to cause in soil lyotropic salt to dissolve or separate out time, its Collapsing Deformation will be more obvious, at Arid&semi-arid area, cause lyotropic salt in soil to separate out due to variations in temperature or dissolve the soil deformation caused being far longer than variations in temperature and causing water in soil to divide to freeze or dissolve the soil deformation caused.
The benefit salt action of washing of loess can be summarized as salinity to the intrusion of loess and leaching, the roadbed settlement distortion caused thus contains molten falling into and saturated yielding two parts, if consider the impact of temperature, then become that salt is swollen, frost heave, moltenly to have fallen into and the interaction of saturated yielding four portion deforms, this process is an extremely complicated multi-scenarios method process, and research difficulty is larger.In order to the saturated yielding of quantitative study loess under the multifactor effects such as moisture, salinity, temperature (or molten sunken) deformation mechanism, researcher had carried out comparatively system research by theory analysis and experimental study to it in the past, but, because the supposition introduced in theoretical research is too much or unreasonable, comparatively actual deviation is larger to result in research conclusion, simultaneously, in experimental study, owing to there is no suitable instrument, particularly do not have the instrument of the multifactor impact on the soil body of energy simultaneous reactions, comparatively engineering entity deviation is larger to result in experimental data.
Summary of the invention
The technical problem that the experimental data that the method that the object of the invention is to solve existing quantitative study loess exists is larger with engineering entity deviation, provides a kind of controllable temperature of soil change such as moisture, salinity, temperature, distortion under temperature and washing mends salt coupling ambient influnence of can dynamically observing to wash-mend salt soil experimental rig and test the method for soil sample.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Salt soil experimental rig is washed-mended to a kind of controllable temperature, it by soil sample tube, temperature control system, wash-mend salt system, water booster system and data collecting system and form, the barrel skin of described soil sample tube is provided with heat barrier foam glassy layer, foam heat-insulating top board is equipped with at soil sample tube top, heat insulation bottom board is equipped with in bottom, plays the object of heat-insulation and heat-preservation, temperature control system is made up of two thermostated cooling bath controllers and two heat transfer tubes, a heat transfer tube is wrapped on the outer wall of soil sample tube, two ends are connected with the upper interface of two thermostated cooling bath controllers respectively, and the two ends of another root heat transfer tube are directly connected with two thermostated cooling bath controller lower interface, wash-mend salt system to be made up of water (salt) compensation tank, rubber tube, water (salt) collection container, flowmeter conduit and Intelligent flowmeter, the outlet of water (salt) compensation tank is connected with one end of rubber tube, the other end of rubber tube is connected with the water inlet of Intelligent flowmeter, the delivery port of Intelligent flowmeter and flowmeter tubes connection, the sidewall that flowmeter conduit is located at soil sample tube stretches into the inner chamber of soil sample tube, water booster system is made up of with pressurization bed piece the backing plate top board that pressurizes, and pressurization backing plate top board is connected with pressurization bed piece by screw thread, and foam heat-insulating top board is at pressurization backing plate top board and pressurize between bed piece, data collecting system is by water flow collection device, hydro-thermal salt coupling sensor, hydro-thermal salt Acquisition Instrument, displacement transducer, displacement acquisition device, data wire and microcomputer composition, the signals collecting end of water flow collection device is by data wire and intelligent flow list catenation, hydro-thermal salt coupling sensor is located in the inner chamber of soil sample tube, the signals collecting end of hydro-thermal salt Acquisition Instrument is connected with hydro-thermal salt coupling sensor by data wire, displacement transducer is located at the upper end of soil sample tube, the signals collecting end of displacement acquisition device is connected with displacement transducer by data wire, water flow collection device, hydro-thermal salt Acquisition Instrument is connected with microcomputer with the signal output of displacement acquisition device.
Use above-mentioned controllable temperature to wash-mend a method for salt soil experimental rig test soil sample, it is made up of the following step:
1) soil sample initial aqueous rate and soluble salt content is measured;
2) by step 1) in soil sample load in soil sample tube, install in soil sample process, hydro-thermal salt sensor and Intelligent flowmeter be embedded in soil sample;
3) then execute on increased pressure board heavily to setting value;
4) heat to 25 DEG C to soil sample and keep constant temperature;
5) calculate by the Water Content Tests in Soil Samples of setting and soluble salt content the concentration of salt solution and volume that need, and by water (salt) compensation tank, salting liquid or water be replenished to soil sample, interval within 48 hours, make soil sample moisture and salt distribution even;
6) then by 0.5 DEG C/h, soil sample is warming up to 30 DEG C, and records specimen deformation situation;
7) by-0.5 DEG C/h, soil sample is cooled to 5 DEG C again, and records specimen deformation situation;
8) then by 0.5 DEG C/h, soil sample is warming up to 30 DEG C, and records specimen deformation situation;
9) by water (salt) compensation tank by distilled water supply soil sample, and record specimen deformation situation;
10) after water outlet bottom sample, water (salt) collection container is collected and is discharged water, measures its electrical conductivity, when the conductivity is stable, and record specimen deformation situation.
Described soil sample is undisturbed soil or disturbed soil.
The soil sample of described soluble salt content more than 0.3%, the mode of mending salt after adopting the first desalinization of soil by flooding or leaching is tested, otherwise adopts the mode of the desalinization of soil by flooding or leaching after salt of first mending to test.
Described on increased pressure board Shi Chongwei on pressurization backing plate, place counterweight, the counterweight weight pressure size that soil layer is suffered in basis residing for soil sample is determined, as determined, calculates required weight of placing counterweight according to 200kPa.
Owing to present invention employs technique scheme, the experimental data that the method solving existing quantitative study loess exists and the larger technical problem of engineering entity deviation.Compared with background technology, the present invention has that method of operating is easy, conversion condition flexibly, experimental data and engineering entity deviation less and the advantage that different soils tests needs can be met.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of water booster system of the present invention;
Fig. 3 is the programme diagram testing soil sample method after the present invention first mends salt under desalinization of soil by flooding or leaching pattern.
In figure: 1-soil sample tube, 2-heat barrier foam glassy layer, 3-heat insulation top board, 4-heat insulation bottom board, 5-thermostated cooling bath controller, 6-heat transfer tube, 7-water (salt) point compensation tank, 8-rubber tube, 9-water (salt) point collection container, 10-flowmeter conduit, 11-water booster system, 12-Intelligent flowmeter, 13-water flow collection device, 14-hydro-thermal salt coupling sensor, 15-hydro-thermal salt Acquisition Instrument, 16-displacement transducer, 17-displacement acquisition device, 18-data wire, 19-microcomputer, 20-pottery clay plates, 21-fine sand, 22-sheet plastic, 23-soil sample, 24-pressurization backing plate top board, 25-pressurization bed piece.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As depicted in figs. 1 and 2, salt soil experimental rig is washed-mended to controllable temperature in the present embodiment, it by stainless steel soil sample tube 1, temperature control system, wash-mend salt system, water booster system 11 and data collecting system and form, the barrel skin of described soil sample tube 1 is provided with heat barrier foam glassy layer 2, foam heat-insulating top board 3 is equipped with at soil sample tube top, heat insulation bottom board 4 is equipped with in bottom, plays the object of heat-insulation and heat-preservation, temperature control system is made up of two thermostated cooling bath controllers 5 and two heat transfer tubes 6, wherein a heat transfer tube 6 is wrapped on the outer wall of soil sample tube 1, two ends are connected with the upper interface of two thermostated cooling bath controllers 5, the two ends of another root heat transfer tube 6 are directly connected with two thermostated cooling bath controller lower interface, heat conduction refrigerating plant, temperature controller and conduction oil are equipped with in thermostated cooling bath controller inside, the dynamic change of temperature within the scope of realizing-30 ~+80 DEG C by design temperature controller, wash-mend salt system by water (salt) compensation tank 7, rubber tube 8, water (salt) collection container 9, flowmeter conduit 10 and Intelligent flowmeter 12 form, the outlet of water (salt) compensation tank 7 is connected with one end of rubber tube 8, the other end of rubber tube 8 is connected with the water inlet of Intelligent flowmeter 12, the delivery port of Intelligent flowmeter 12 is connected with flowmeter conduit 10, the sidewall that flowmeter conduit 10 is located at soil sample tube 1 stretches into the inner chamber of soil sample tube 1, during the desalinization of soil by flooding or leaching by in-built for water (salt) compensation tank 9 be pure water, by in-built for water (salt) compensation tank 9 certain density salt solution (such as sodium sulfate salt solution) during benefit salt, water booster system 11 is made up of pressurization backing plate top board 24 and pressurization bed piece 25, pressurization backing plate top board 24 is connected with pressurization bed piece 25 by screw thread, foam heat-insulating top board 3, between pressurization backing plate top board 24 and pressurization bed piece 25, applies pressure by water booster system 11 being shelved counterweight at soil sample 23 top, data collecting system is by water flow collection device 13, hydro-thermal salt coupling sensor 14, hydro-thermal salt Acquisition Instrument 15, displacement transducer 16, displacement acquisition device 17, data wire 18 and microcomputer 19 form, the signals collecting end of water flow collection device 13 is connected with Intelligent flowmeter 12 by data wire 18, several hydro-thermal salt coupling sensors 14 are located in the inner chamber of soil sample tube 1, the signals collecting end of hydro-thermal salt Acquisition Instrument 15 is connected with several hydro-thermal salt coupling sensors 14 by data wire 18, displacement transducer 16 is located at the upper end of soil sample tube 1, the signals collecting end of displacement acquisition device 17 is connected with displacement transducer 16 by data wire 18, water flow collection device 13, hydro-thermal salt Acquisition Instrument 15 is connected with microcomputer 19 with the signal output of displacement acquisition device 17.
Use above-mentioned controllable temperature to wash-mend a method for salt soil experimental rig test soil sample, it is made up of the following step:
1) undisturbed soil soil sample initial aqueous rate and soluble salt content is measured;
2) by step 1) in undisturbed soil soil sample load in soil sample tube 1, install in soil sample process, hydro-thermal salt sensor 14 and Intelligent flowmeter 12 be embedded in soil sample 23;
3) on increased pressure board, then place counterweight to setting value, the counterweight weight pressure size that soil layer is suffered in basis residing for undisturbed soil soil sample is determined;
4) heat to 25 DEG C to undisturbed soil soil sample and keep constant temperature;
5) calculate by the Water Content Tests in Soil Samples of setting and soluble salt content the concentration of salt solution and volume that need, and by water (salt) compensation tank 7, salting liquid or water be replenished to soil sample, interval within 48 hours, make soil sample moisture and salt distribution even;
6) then by 0.5 DEG C/h, soil sample is warming up to 30 DEG C, and records undisturbed soil specimen deformation situation;
7) by-0.5 DEG C/h, soil sample is cooled to 5 DEG C again, and records undisturbed soil specimen deformation situation;
8) then by 0.5 DEG C/h, undisturbed soil soil sample is warming up to 30 DEG C, and records undisturbed soil specimen deformation situation;
9) by water (salt) compensation tank 7 by distilled water supply undisturbed soil soil sample, and record specimen deformation situation;
10) after water outlet bottom sample, water (salt) collection container 9 is collected and is discharged water, measures its electrical conductivity, when the conductivity is stable, and record undisturbed soil specimen deformation situation, off-test.
Above-mentioned undisturbed soil can also be disturbed soil.
Soil sample soluble salt content in above-described embodiment is more than 0.3%, and the mode of mending salt after adopting the first desalinization of soil by flooding or leaching is tested, otherwise adopts the mode of the desalinization of soil by flooding or leaching after salt of first mending to test.
The above-mentioned counterweight weight pressure size that soil layer is suffered in basis residing for soil sample be placed on pressurization backing plate is determined, as determined, calculates required weight of placing counterweight according to 200kPa.
Concrete test method of the present invention is:
(1) disturbed soil test method
1. debug thermostated cooling bath controller 5, and check that heat transfer tube 6 seals situation, start trial run checks temperature control system temperature control effect.The soil sample tube 1 periphery winding heat transfer tube 6 leaving preformed hole at sidewall (notes not pushed down by heat transfer tube 6 preformed hole of soil sample tube 1 sidewall with installation heat barrier foam glassy layer 2, and the preformed hole of soil sample tube 1 is aimed at the preformed hole of heat barrier foam glassy layer 2), check soil sample tube 1 sealed bottom situation.In order to ensure heat insulation bottom board 4 not because being damaged by pressure in filling soil sample process, the foam glass isolation layer that heat insulation bottom board 4 should adopt intensity higher; At the sheet plastic 22 that heat insulation bottom board 4 upper berth one deck is onesize with it, stainless steel soil sample tube 1 centering installing heat transfer tube 6 and heat barrier foam glassy layer 2 is placed on sheet plastic 22, a circle glass cement is smeared, with antiseep with sheet plastic 22 contact position around in soil sample tube 1.
2. water outlet Intelligent flowmeter 12 bottom soil sample tube 1 fixed, be sealed in bottom soil sample tube 1 and the preformed hole position of isolation layer 2, and bottom soil sample tube 1, load the thick fine sand of 5cm 21; The port of water flow table conduit 10 near soil sample tube 1 inside answers colligation filter screen, in order to avoid fine sand 21 choked flow scale conduit 10.
3. disturbed soil soil sample initial aqueous rate and soluble salt content is measured;
4. layering filling, tamping disturbed soil soil sample, lift height controls at about 5cm, when soil sample is filled in bottommost water inlet Intelligent flowmeter 12 At The Height, bottom first layer flow of inlet water 12 is shown penetrate in soil sample tube 1 by soil sample barrel 1 preformed hole, and smear glass cement at cylinder inwall preformed hole place, to reach the double effects of fixed flow scale conduit 10 and sealing preformed hole; The length that the conduit of Intelligent flowmeter 12 of should ensureing to intake gos deep into soil sample is not less than 3cm, and avoid the water (salt) of supply point directly to get rid of from water flow table along soil sample tube 1 inwall, what affect the soil body washes benefit salt effect.
5. continue to load, tamping soil sample (notes bottom flowtube during tamping soil sample, in order to avoid batter), in order to ensure not destroy sensor in tamping soil sample process, load to when exceeding pre-buried hydro-thermal salt coupling sensor 14 position 2 ~ 3cm height until soil sample, suspend and load soil sample, and in soil sample surface grooving to predetermined hydro-thermal salt coupling sensor 14 depth, by hydro-thermal salt coupling sensor 14 (or water, heat, salt three index standalone sensor) data wire by soil sample barrel 1 preformed hole from wearing to soil sample tube 1 in cylinder, then glass cement sealing preformed hole is smeared at cylinder inwall preformed hole place.
6. by 4. above-mentioned and 5. step, layering is loaded soil sample, is buried sensor 14 underground and install Intelligent flowmeter 12, until apart from 10cm place, cylinder top.All already installed Intelligent flowmeters 12 are connected with rubber tube 8, and rubber tube 8 is connected with water (salt) point compensation tank 9.
7. place the thick pottery clay plates 20 of 5cm at soil sample top, then place pressurization bed piece 25, heat insulation top board 3, pressurization backing plate top board 24 successively, and pressurization backing plate top board 24 is screwed on pressurization bed piece 25; Pottery clay plates 20 mainly plays the heat insulation effect with preventing salt water contamination pressurization bed piece 25 herein, and applies uniform pressure to soil sample top.
8. on pressurization backing plate top board 24, place counterweight according to test, the counterweight weight pressure size that soil layer is suffered in basis residing for disturbed soil soil sample is determined; Dial gauge installed by pressurization backing plate top board 24, and returns to zero; Sensor 14 is connected with computer by data acquisition unit, and opens moisture, temperature, the salinity data acquisition software on computer.
9. the thermostated cooling bath controller 5 of open temp control system, and design temperature; According to the disturbed soil soil sample initial aqueous rate measured and soluble salt content, in water (salt) compensation tank 7, dose pure water or certain density salting liquid; Heat to 25 DEG C to disturbed soil soil sample and keep constant temperature, liquid level in water (salt) compensation tank 7 and soil sample end face are remained on same level, open water inlet Intelligent flowmeter 12, flow to inside soil body by predetermined flow by the liquid (pure water or salting liquid) in water (salt) compensation tank 7, model engineering site road roadbed or the external moisture of substrate and salinity are to the desalinization of soil by flooding or leaching-benefit salt action of the soil body; By salting liquid or water supply disturbed soil soil sample, interval within 48 hours, make soil sample moisture and salt distribution even; Compensation tank liquid level and soil sample end face should be made in process of the test to remain on same level, if compensation tank liquid level is too high, water (salt) branch overflows from soil sample tube 1 end face, if liquid level is too low, in soil sample tube 1, soil sample top is washed and mended salt effect by influenced.
10. according to the environment temperature of engineering site reality and the situation of change of external moisture (heavy showers or man-made irrigation), the temperature dynamic constant interval of design temperature control system and water inlet (pure water or salting liquid) Intelligent flowmeter 12 flow, then by 0.5 DEG C/h, soil sample is warming up to 30 DEG C, and records disturbed soil specimen deformation situation by soil sample top displacement sensor 16; By-0.5 DEG C/h, soil sample is cooled to 5 DEG C again, and records disturbed soil specimen deformation situation; Then by 0.5 DEG C/h, disturbed soil soil sample is warming up to 30 DEG C, and records disturbed soil specimen deformation situation; By water (salt) compensation tank 7 by distilled water supply disturbed soil soil sample, and record specimen deformation situation; After water outlet bottom sample, water (salt) collection container 9 is collected and is discharged water, measures its electrical conductivity, when the conductivity is stable, and record disturbed soil specimen deformation situation, off-test; The situation of change of the index such as ultimate analysis soil body moisture, salinity, temperature, distortion and interaction affecting laws.
(2) undisturbed soil test method
For the collapsible mechanics mending loess under salt action is washed in research, need to study the undisturbed soil at road scene, the implementation method of the present invention to undisturbed soil is as follows:
1. at the sheet plastic 22 that heat insulation bottom board 4 upper berth one deck is onesize with it, stainless steel soil sample tube 1 centering sidewall being left preformed hole is placed on sheet plastic 22, a circle glass cement is smeared with sheet plastic 22 contact position around in soil sample tube 1, with antiseep (in order to ensure heat insulation bottom board 4 not because being damaged by pressure in filling soil sample process, the foam glass isolation layer that heat insulation bottom board 4 should adopt intensity higher); Heat transfer tube 6 is wrapped in soil sample tube 1 periphery (noting not pushed down by heat transfer tube 6 preformed hole of soil sample tube 1 sidewall), and debug thermostated cooling bath controller 5, and checking that heat transfer tube 6 seals situation, start trial run checks temperature control system temperature control effect.
2. water outlet Intelligent flowmeter 12 bottom soil sample tube 1 fixed, be sealed in preformed hole position bottom soil sample tube 1, and bottom soil sample tube 1, load the thick fine sand of 5cm 21; The port of water flow table conduit 10 near soil sample tube 1 inside answers colligation filter screen, in order to avoid fine sand 21 choked flow scale conduit 10.
3. undisturbed soil soil sample initial aqueous rate and soluble salt content is measured;
4. all the sensors data wire 18 is passed soil sample barrel 1 preformed hole; By sensor burial place, at the undisturbed soil sample cut (diameter 20cm, high 45cm) side draws out the duck eye identical with sensor diameter, and draw out the duck eye identical with flowtube diameter according to the position that water inlet Intelligent flowmeter 12 is installed at undisturbed soil sample opposite side; All the sensors 14 is put in the duck eye of soil sample sidewall, and fill up duck eye to former state by same soil property;
5. the undisturbed soil sample installing sensor is placed in soil sample tube 1, and the duck eye of the flowmeter conduit 10 to be installed of soil sample opposite side is aimed at the preformed hole of Intelligent flowmeter 12 on soil sample barrel 1, insert flowmeter conduit 10 one by one from soil sample tube 1 outer wall; Smear glass cement at soil sample tube 1 outer wall by around the preformed hole of the preformed hole and flowmeter conduit 10 that install sensor data cable 18, seal all preformed holes.
6. by the preformed hole of sensor data cable 18 through heat barrier foam glassy layer 2 side, and the opposite side leaving the heat barrier foam glassy layer 2 of vertical through notch is aimed at the position having installed all flowmeter conduits 10, insert heat barrier foam glassy layer 2, be arranged on the periphery of the soil sample tube 1 winding heat transfer tube 6; By preformed holes all outside heat barrier foam glassy layer 2 and notch place (comprising sensor data cable and flowmeter), and heat barrier foam glassy layer 2 contacts seam place glass cement and seals with heat insulation bottom board 4.
7., 8., 9. and 10. step according to 7., 8., 9. and 10. implementing in " disturbed soil test method ".
In above-mentioned two kinds of test methods, temperature control system can control soil sample temperature, the change in displacement gathered by displacement transducer 16, simulates to cause salt in soil to analyze due to soil sample lyotropic salt changes in solubility or to dissolve the soil sample salt caused swollen or moltenly to fall into.
Above two kinds of test methods can measure the molten sunken coefficient of the higher soil sample of soluble salt content (soluble salt content is more than or equal to 0.3%) and molten sunken initial pressure.
For the soil sample of soluble salt content more than 0.3%, in above two kinds of test methods, displacement transducer 16 is first adopted to record soil sample decline shift value in desalinization of soil by flooding or leaching process, then soil sample temperature is down to 4 DEG C, observation soil sample rising shift value (this value can be used as molten sunken estimate), aforementioned decline shift value is deducted aforementioned rising shift value, the estimate of saturated yielding in specimen deformation can be obtained, and molten in specimen deformation falling into and the different proportion shared by saturated yielding can be analyzed, for assessment increase and decrease is wet and wash and to mend under salt comprehensive function molten in soil deformation to fall into and saturated yielding proportion provides laboratory reference, and the deformation mechanism of the soil body provides theoretical foundation under washing benefit salt for analysis and increasing and decreasing wet coupling.
For the soil sample of soluble salt content more than 0.3%, in above two kinds of test methods, after adopting the first desalinization of soil by flooding or leaching, mend the mode test model of salt, otherwise adopt the test model of first mending the desalinization of soil by flooding or leaching after salt.
In benefit salt process, soil sample saturated yielding under a certain pressure or molten sunken deflection can be observed, and Observable is due to the change of the soil sample volume that soluble salt content in soil sample increases and variations in temperature causes.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.

Claims (5)

1. salt soil experimental rig is washed-mended to a controllable temperature, it is characterized in that: it by soil sample tube (1), temperature control system, wash-mend salt system, water booster system and data collecting system and form, the barrel skin of described soil sample tube (1) is provided with heat barrier foam glassy layer (2), foam heat-insulating top board (3) is equipped with at soil sample tube top, heat insulation bottom board (4) is equipped with in bottom, plays the object of heat-insulation and heat-preservation, temperature control system is made up of two thermostated cooling bath controllers (5) and two heat transfer tubes (6), a heat transfer tube (6) is wrapped on the outer wall of soil sample tube (1), two ends are connected with the upper interface of two thermostated cooling bath controllers (5) respectively, and the two ends of another root heat transfer tube (6) are directly connected with two thermostated cooling bath controller lower interface, wash-mend salt system by water (salt) compensation tank (7), rubber tube (8), water (salt) collection container (9), flowmeter conduit (10) and Intelligent flowmeter (12) composition, the outlet of water (salt) compensation tank (7) is connected with one end of rubber tube (8), the other end of rubber tube (8) is connected with the water inlet of Intelligent flowmeter (12), the delivery port of Intelligent flowmeter (12) is connected with flowmeter conduit (10), the sidewall that flowmeter conduit (10) is located at soil sample tube (1) stretches into the inner chamber of soil sample tube (1), water booster system by pressurize backing plate top board (24) and pressurization bed piece (25) form, pressurization backing plate top board (24) is connected with pressurization bed piece (25) by screw thread, and foam heat-insulating top board (3) is positioned between pressurization backing plate top board (24) and pressurization bed piece (25), data collecting system is by water flow collection device (13), hydro-thermal salt coupling sensor (14), hydro-thermal salt Acquisition Instrument (15), displacement transducer (16), displacement acquisition device (17), data wire (18) and microcomputer (19) composition, the signals collecting end of water flow collection device (13) is connected with Intelligent flowmeter (12) by data wire (18), hydro-thermal salt coupling sensor (14) is located in the inner chamber of soil sample tube (1), the signals collecting end of hydro-thermal salt Acquisition Instrument (15) is connected with hydro-thermal salt coupling sensor (14) by data wire (18), displacement transducer (16) is located at the upper end of soil sample tube (1), the signals collecting end of displacement acquisition device (17) is connected with displacement transducer (16) by data wire (18), water flow collection device (13), hydro-thermal salt Acquisition Instrument (15) is connected with microcomputer (19) with the signal output of displacement acquisition device (17).
2. use the controllable temperature described in claim 1 to wash-mend a method for salt soil experimental rig test soil sample, it is characterized in that: it is made up of the following step:
1) soil sample initial aqueous rate and soluble salt content is measured;
2) by step 1) in soil sample load in soil sample tube (1), install in soil sample process, hydro-thermal salt sensor (14) and Intelligent flowmeter (12) be embedded in soil sample (23);
3) then execute on increased pressure board heavily to setting value;
4) heat to 25 DEG C to soil sample and keep constant temperature;
5) concentration of salt solution and volume that need is calculated by the Water Content Tests in Soil Samples set and soluble salt content, and by water (salt) compensation tank (7), salting liquid or water are replenished to soil sample, interval within 48 hours, make soil sample moisture and salt distribution even;
6) then by 0.5 DEG C/h, soil sample is warming up to 30 DEG C, and records specimen deformation situation;
7) by-0.5 DEG C/h, soil sample is cooled to 5 DEG C again, and records specimen deformation situation;
8) then by 0.5 DEG C/h, soil sample is warming up to 30 DEG C, and records specimen deformation situation;
9) by water (salt) compensation tank (7) by distilled water supply soil sample, and record specimen deformation situation;
10) after water outlet bottom sample, water (salt) collection container (9) is collected and is discharged water, measures its electrical conductivity, when the conductivity is stable, and record specimen deformation situation.
3. the method for test soil sample according to claim 2, is characterized in that: described soil sample is undisturbed soil or disturbed soil.
4. the method for test soil sample according to claim 2, is characterized in that: the soil sample of described soluble salt content more than 0.3%, and the mode of mending salt after adopting the first desalinization of soil by flooding or leaching is tested, otherwise adopts the mode of the desalinization of soil by flooding or leaching after salt of first mending to test.
5. the method for test soil sample according to claim 2, it is characterized in that: described on increased pressure board Shi Chongwei pressurization backing plate on place counterweight, the counterweight weight pressure size that soil layer is suffered in basis residing for soil sample is determined, as determined, calculate required weight of placing counterweight according to 200kPa.
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CN109030386A (en) * 2018-06-13 2018-12-18 袁静 A kind of soil property detection box for teaching
CN109142681A (en) * 2018-09-06 2019-01-04 太原理工大学 A kind of controllable constant-temperature can survey the novel soil-column test device of conductivity
CN110455703A (en) * 2019-09-02 2019-11-15 中南大学 A kind of test device and its test method of compacted soil vaporous water and lyotropic salt migration

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CN109142681A (en) * 2018-09-06 2019-01-04 太原理工大学 A kind of controllable constant-temperature can survey the novel soil-column test device of conductivity
CN110455703A (en) * 2019-09-02 2019-11-15 中南大学 A kind of test device and its test method of compacted soil vaporous water and lyotropic salt migration

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