CN106370816B - It is a kind of can dynamic testing soil dehumidification/frozen water content variation characteristic pilot system - Google Patents
It is a kind of can dynamic testing soil dehumidification/frozen water content variation characteristic pilot system Download PDFInfo
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Abstract
It is a kind of can dynamic testing soil dehumidification/freezing process water characteristic pilot system, including pressurization systems for moisture removal, temperature control system and automated data acquisition system, the system be by pressurization systems for moisture removal and temperature control system be combined in the way of realize that the constant temperature dehumidification drying process of pedotheque and constant pressure cool down freezing process.The invention enables entire dryings to carry out in the adjustable constant temperature control box of temperature, and complete Soil moisture characteristics test, soil is fundamentally reduced in drying since error caused by the latencies such as temperature change, moisture evaporation, soil volume change, manual operation influences, on the other hand cooling freezing process of soil under the conditions of different pressures is realized by pressue device, effective ways and means is provided for the experimental study of freezing soil under condition of high voltage.The present invention can be used for soil pattern and realize dehydration and drying process under the temperature condition of setting, it can also be used to which pedotheque realizes cooling freezing process under the pressure condition of setting, realizes the automation monitoring in real time and acquisition of soil pattern dynamic changing process.
Description
Technical field
The present invention relates to a kind of test systems, in particular to one kind can dynamic testing soil dehumidification/frozen water content change
Change the pilot system of feature.
Background technology
Soil Water balance, with aeration zone related water resources development profit of the Soil moisture characteristics in agricultural production
With the consolidation of unsaturated soil and sedimentation etc. in the migration and engineering practice with ecological environmental protection problem, prediction vadose zone pollutant
Research in play an important role and meaning.Gorges Liu Su et al. were in 2013《Acta Phytoecologica Sinica》The 1st phase of volume 37 delivers
" Chinese root layer with surface soil water relationship analysis " one the article pointed out that " soil moisture is because it is as connection earth surface soil
The special status of the tie of earth-vegetation-air and the concern for being increasingly subject to each related discipline.Climate change, earth surface process,
Weather forecast, flood, agricultural and water resources management are largely dependent upon the correct understanding to soil moisture ".For
Water characteristic in soil is described, we use the matric suction in soil（Or head）With the object of water content situation in characterization soil
Reason amount（Such as liquid water quality, liquid water volume and saturation degree）Soil moisture research work is carried out as variable, and this
Relationship between two kinds of variables is referred to as characteristic curve of soil moisture.By characteristic curve of soil moisture, it is non-that calculating can be derived
Saturated soil Penetration Signature, unsaturation soil classifiction, unsaturated soil are with one mentioned by moisture distribution and contaminant transportation etc.
Series of problems.This requires we the physical quantitys such as matric suction, water content for characterizing Soil moisture characteristics can be carried out it is accurate and
It is effective to measure, to draw out the characteristic curve of soil moisture under various soil conditions and different external environments.In view of scene
The shortcomings of test observation period is long, costly, uncertain factor is big, research work of the indoor dehumidification experiment in Soil moisture characteristics
There is the sufficient weight of tool in work.
In recent years, the concept of characteristic curve of soil moisture is gradually extended to frozen soil field from non-frozen soil, because soil freezes
Process and drying have many similitudes, are in particular in the reduction with aqueous water in freezing process, hole in soil
The solid ice gradually come by phase transformation is filled, and with the gradual dissipation of liquid water in drying, in soil hole then by
The air entered therewith is filled.Although filler during two in soil pores difference, certainly exists in certain
Contact.Spaans, E.J.A. et al. 1996《Soil Science Society of America
Journal》" the The Soil Freezing Characteristic that the 1st phase of volume 60 delivers: Its Measurement
Freezing and taking off for soil is just pointed out in an and Similarity to the Soil Moisture Characteristic " texts
Wet process has certain similitude, and theoretically has studied the relevance having between the two, but due to experimental condition
It is limited, do not obtain sufficient verification experimental verification.Therefore, carry out respectively in the same apparatus dehumidification and freezing test and both it
Between correlation test research be very necessary.
Currently, obtaining the experimental technique and the main tensioned meter of instrument, contact and non-contact of characteristic curve of soil moisture
Formula filter paper method, the pressure plare based on axial translation technology（Film）Instrument method etc..Tensometer method measure suction be applicable to laboratory test and
On-the-spot test, but its measurable suction force range is extremely limited, which also limits the practical ranges of this method, and
Transmission efficiency of certain Soil Under Conditions water between tensometer and soil, it is impossible near being enough to allow correctly to be measured
Go out the degree of soil water potential variation.Filter paper technology has obtained industry because its principle is simple, cheap in agricultural and soil science
The extremely wide application of interior personage, but when soil suction is excessive or too small, the applicability of the technology will have a greatly reduced quality,
Even existing conclusion shows same type of filter paper, since researcher is different or filter paper batch is different, calibration curve all may
Generate larger difference（The such as Lu Ning unsaturated soils theories [M]（Wei Changfu etc. is translated）, Beijing：Higher Education Publishing House, 2012）.Pressure
Power film instrument method needs impressed pressure that soil is made to reach balance under specified moisture content during the test, external pressurized force value after balance
Also it is equal to soil suction, this method test scope is big, relatively accurate, but there is also certain problems and deficiency, for example, can only
Water content and suction value after balance are obtained, the dynamic change of suction and water content of the soil in equilibrium process is unable to monitor
Process, and be affected by manual operation error；In addition, traditional pressure membrane instrument is unable to control the temperature of pedotheque, this
So that in the case where variation of ambient temperature is larger, carburation by evaporation situation is than more prominent, so as to cause what is obtained according to displacement
Liquid water content calculated value generates relatively large deviation（In Yang Gang, Yang Qing soil―structure interaction continuous modes underlying factor with
Abnormal phenomenon research [J] rock-soil mechanics, 2014,35（2）: 397-406）, these all can largely influence soil
The drafting precision of water characteristic curve.What is more important is goed deep into and is developed with cyopedology, the soil water in freezing process
Properties study is divided also gradually to go deep into, it is probe into the native physical and mechanical properties changing rule in thermal exchange one
The important evidence for the theoretical research and numerical simulation that basic constitutive relation and frozen soil Zhong Shui, heat, matter migrate.In freezing process
The theory and Mechanism Study of Soil moisture characteristics design for cold regions engineering, construction and maintenance provide theories integration, and analyze ground
Frozen-thaw process and phenomenon are also research hydrological characteristics, the important foundation of other topographical features and climate model simultaneously.In view of soil
Dehumidification and freezing process have certain similitude in mechanism, therefore finding out certain particular kind of relationship between the two not only can be with
The research work that soil freezing process water characteristic is pushed by existing dehumidification theory, can also provide for the research of drying
Beneficial help.Because when soil is in low water content state, the drying under room temperature will become relative difficulty, reach
The time of balance is long, and freezing process is then relatively easy very much.Therefore, it is obtained when the soil body in the case that water content is lower
When water characteristic curve, the method freezed is selected to be particularly likely that a kind of simple and fast mode.Just there is an urgent need to a kind of examinations for this
Method and apparatus are tested, to dehumidification and two kinds of processes can be freezed compares and analyzes, to be two kinds of process moisture of research
The inner link of changing features provides basis.
How under the premise of the measurement range in ensureing drying soil, eliminate in test process since temperature becomes
Error caused by the latencies such as change, moisture evaporation, manual operation influences, and completes the validity test to Soil moisture characteristics parameter
It is imperative；Meanwhile how to realize and dehumidification and freezing test, and then two kinds of items of comparative study are carried out respectively to identical pedotheque
The internal relation that water characteristic changes under part provides the trend that necessary testing and verification is soil science development for theoretical research；
In addition, how to monitor the dynamic change of each variable in real time during the test, and it is automatic so that data acquisition and storage are realized
Change, is the effective way for improving soil characteristic testing efficiency.Integrating temperature control and pressurization because the invention is a kind of, can test respectively
Soil dehumidification and freezing process moisture variation characteristic pilot system, to further investigation condition of different temperatures under soil hydro-thermal
Variation characteristic all has very important significance.
Invention content
To solve defect and deficiency existing for existing soil dehumidifying device and method, and realizes soil dehumidification and freeze two
The comparative experimental research of kind Soil Under Conditions water characteristic curve, the purpose of the present invention is intended to provide one kind can dynamic testing soil
The pilot system of dehumidification/frozen water content feature.The system can either realize that dehumidification of the pedotheque under condition of different temperatures is dry
Dry process can also realize freezing process of the pedotheque under different atmospheric pressure conditions.The sensor in soil sample can simultaneously
To realize real-time dynamic monitoring to variables such as temperature, liquid water volume content and matric suctions, and by connecting data acquisition
Instrument, computer realize automation collection and the storage of data.
The technical solution adopted in the present invention is：
It is a kind of can dynamic testing soil dehumidification/frozen water content variation characteristic pilot system, including pressurization systems for moisture removal, temperature
It includes pressure-bearing soil sample case, soil sample case top to spend control system and automated data acquisition system three parts, the pressurization systems for moisture removal
Lid, fastening bolt, soil sample case sealing ring, hollow bolt, bolt seal circle, interval pedestal, the permeable stone with water draining beak, soil sample are about
Beam ring, impermeable layer, collection bottle, Weighing module, soil sample bottom seat, temperature moisture transducer, matric suction sensor, pressurization dress
It sets and pressure gauge；The temperature control system includes constant temperature control box, top cover of box, head cover shaft, refrigeration compressor, compressor
Cooling fin, circulating fan, electric heating wire, temperature controller, temperature control panel and temperature sensor；The automated data is adopted
Collecting system includes sensor lead, data collecting instrument and computer.
Above-mentioned constant temperature control box is connect by head cover shaft with top cover of box；Be equipped in constant temperature control box pressure-bearing soil sample case,
It is spaced pedestal, Weighing module, soil sample bottom seat, refrigeration compressor, convection fan, electric heater, temperature controller；Thermostatic control
Case side wall is equipped with compressor cooling fin；Compressor cooling fin is connect with refrigeration compressor；Pressurization dress is additionally provided with outside constant temperature control box
It sets, temperature control panel, data collecting instrument and computer；Temperature control panel respectively with convection fan, electric heating wire, temperature control
Instrument connection processed.
Pressure-bearing soil sample case 1 is connect by fastening bolt 3 with soil sample case head cover 2, and inner cavity, which is one, can bear certain pressure
Enclosure space；Interval pedestal 7, the permeable stone 8 with water draining beak, soil sample confinement ring 9, impermeable layer are equipped in pressure-bearing soil sample case 1
10；Place interval pedestal 7 in 1 bottom of pressure-bearing soil sample case；It is spaced on pedestal 7 and places impermeable layer 10；Soil is placed on impermeable layer 10
Sample confinement ring 9；Soil sample is placed in soil sample confinement ring 9.
Soil sample case head cover 2 is equipped with hollow bolt 5；5 bottom of hollow bolt is equipped with bolt seal circle 6.
Pressure gauge 17 connects pressue device 16；Pressue device 16 is connected to by conduit with 1 inner cavity of pressure-bearing soil sample case.
Moisture transducer 14 and matric suction sensor 15 are arranged in soil sample.
Moisture transducer 14, matric suction sensor 15 are connect by sensor lead with data collecting instrument 28；Data are adopted
Collection instrument 28 is connect with computer 29.
In dehumidification experiment, the permeable stone 8 with water draining beak is equipped between soil sample confinement ring 9 and impermeable layer 10.
The permeable stone 8 with water draining beak is connect by conduit with collection bottle 11；Collection bottle 11 is positioned over Weighing module
On 12.
Refrigeration compressor 21, convection fan 23, electric heater 24, temperature controller 25 and the temperature sensor 27 is in fact
The now adjusting to the temperature in constant temperature control box 18 and holding temperature incubation function.
6 quantity of bolt seal circle is 6 ~ 10, and bolt seal circle 6 is used to ensure the air-tightness of pressure-bearing soil sample case 1.
Advantages of the present invention and the advantageous effect of generation are：
1, the present invention can testing soil sample freezing and the water characteristic element under two kinds of different conditions of dehumidification（Such as temperature
Degree, liquid water volume content, matric suction etc.）, and by the connection of built-in sensors and data collecting instrument, computer, realize
To soil pattern, the automatic monitoring of water characteristic element dynamic changing process and acquisition in dehumidification/freezing process, realize
It is carried out at the same time pressurization and temperature controlling function in experimental rig, carry out soil dehumidification respectively in same experimental rig and freezed
Journey.
2, the mode of seal is encrypted this invention takes hollow bolt to be realized the biography with real-time data collection function
Sensor is introduced into inside pressure vessel so that dehumidifying device can not only test the moisture and matric suction when equilibrium state, moreover it is possible to
Moisture and suction changing rule of the soil sample in not up to equilibrium process are collected, has expanded the use of traditional dehumidifying device significantly
Function, while solving the shadow of moisture evaporation and soil volume change to test result using volume Liquid water content sensor
It rings so that moisture measurement precision further increases.
3, the frozen water content token test of the achievable pedotheque soil under different constant-pressure conditions of the present invention.
4, the present invention realizes entire experiment process by various kinds of sensors by the connection of data collecting instrument and computer
Automation, improves test efficiency.
5, the present invention also has many advantages, such as that definite principle, test are comprehensive, easily operated.
Description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is characteristic curve of soil moisture of the present invention test soil sample in drying.
Fig. 3 is characteristic curve of soil moisture of the present invention test soil sample in freezing process.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention is described further again：
As shown in Figure 1, it is a kind of can dynamic testing soil dehumidification/frozen water content variation characteristic pilot system, including pressurization
Systems for moisture removal, temperature control system and automated data acquisition system three parts, pressurization systems for moisture removal include pressure-bearing soil sample case 1,
Soil sample case head cover 2, fastening bolt 3, soil sample case sealing ring 4, hollow bolt 5, bolt seal circle 6, interval pedestal 7, band water draining beak
Permeable stone 8, soil sample confinement ring 9, impermeable layer 10, collection bottle 11, Weighing module 12, soil sample bottom seat 13, temperature moisture pass
Sensor 14, matric suction sensor 15, pressue device 16 and pressure gauge 17；Temperature control system includes constant temperature control box 18, case
Body head cover 19, head cover shaft 20, refrigeration compressor 21, compressor cooling fin 22, circulating fan 23, electric heating wire 24, temperature control
Instrument 25, temperature control panel 26 and temperature sensor 27 processed；Automated data acquisition system includes sensor lead, data acquisition
Instrument 28 and computer 29.
Constant temperature control box 18 is connect by head cover shaft 20 with top cover of box 19；Pressure-bearing soil sample is equipped in constant temperature control box 18
Case 1, interval pedestal 7, Weighing module 12, soil sample bottom seat 13, refrigeration compressor 21, convection fan 23, electric heater 24, temperature
Controller 25；18 side wall of constant temperature control box is equipped with compressor cooling fin 22；Compressor cooling fin 22 is connect with refrigeration compressor 21；
It is additionally provided with pressue device 16, temperature control panel 26, data collecting instrument 28 and computer 29 outside constant temperature control box 18；Temperature controls
Panel 26 is connect with convection fan 23, electric heating wire 24, temperature controller 25 respectively.
Pressure-bearing soil sample case 1 is connect by fastening bolt 3 with soil sample case head cover 2, and inner cavity, which is one, can bear certain pressure
Enclosure space；Interval pedestal 7, the permeable stone 8 with water draining beak, soil sample confinement ring 9, impermeable layer are equipped in pressure-bearing soil sample case 1
10；Place interval pedestal 7 in 1 bottom of pressure-bearing soil sample case；It is spaced on pedestal 7 and places impermeable layer 10；Soil is placed on impermeable layer 10
Sample confinement ring 9；Soil sample is placed in soil sample confinement ring 9.
Soil sample case head cover 2 is equipped with hollow bolt 5；5 bottom of hollow bolt is equipped with bolt seal circle 6.
Pressure gauge 17 connects pressue device 16；Pressue device 16 is connected to by conduit with 1 inner cavity of pressure-bearing soil sample case.
Moisture transducer 14 and matric suction sensor 15 are arranged in soil sample.
Moisture transducer 14, matric suction sensor 15 are connect by sensor lead with data collecting instrument 28；Data are adopted
Collection instrument 28 is connect with computer 29.
In dehumidification experiment, the permeable stone 8 with water draining beak is equipped between soil sample confinement ring 9 and impermeable layer 10.
The permeable stone 8 with water draining beak is connect by conduit with collection bottle 11；Collection bottle 11 is positioned over Weighing module
On 12.
Refrigeration compressor 21, convection fan 23, electric heater 24, temperature controller 25 and the temperature sensor 27 is in fact
The now adjusting to the temperature in constant temperature control box 18 and holding temperature incubation function.
6 quantity of bolt seal circle is 6 ~ 10, and bolt seal circle 6 is used to ensure the air-tightness of pressure-bearing soil sample case 1.
Embodiment
In implementation process, dehumidification is tested, after being first saturated the permeable stone 8 with water draining beak and impermeable layer 10
Be placed on together can be in pressure-bearing soil sample case 1 interval pedestal 5 on, then need not be with the permeable of water draining beak and for freezing test
Stone 8, only needs impermeable layer（10）.
It is fetched earth with soil sample confinement ring 9, while temperature moisture transducer 14 and matric suction sensor 15 is arranged to soil sample
Middle designated position, later by soil sample confinement ring 9 together with the temperature moisture transducer 14 and matric suction sensing in soil sample and soil sample
Device 15 is placed on the permeable stone 6 after being saturated, and adjustment position makes entire soil sample bottom closely be connect with the permeable stone 8 with water draining beak
It touches.After pressure balance in soil moisture can enter be placed in the collection bottle 11 on Weighing module 12.
For freezing test, drainage channel only need to be closed, it is ensured that pressure stability；Temperature moisture transducer 14 and matrix
15 connecting lead wire of suction sensor by the hollow bolt 5 that is arranged on soil sample case head cover 2 draw can pressure-bearing soil sample case 1, next
4 position of soil sample case sealing ring is adjusted, is fastened with fastening bolt 3 after soil sample case head cover 2 is covered, closed entirety is formed, it will
Fastening complete can pressure-bearing soil sample case 1 be put into above the soil sample bottom seat 13 of constant temperature control box 18 because constant temperature control box 18 by
Top cover of box 19 constitutes openable and closable body structure with head cover shaft 20, therefore by constant temperature control box after all are ready
18 cappings realize the cooling of pedotheque, temperature-rise period in case by refrigeration compressor 21 and electric heater 24, and pass through convection current
For fan 23 so that the air in constant temperature control box 18 is in flow regime, guarantee constant temperature effect, refrigeration compressor 21 passes through compressor
Cooling fin 22 reaches good thermal diffusivity, and temperature can be by being circumscribed with the temperature control of temperature control panel 26 in constant temperature control box 18
Instrument 25 processed is arranged, and is monitored in real time by the temperature sensor 27 in case.
Pressue device 16 outside babinet applies specified pressure to soil sample, and reads and control by pressure gauge 17 and pressurizeed
The numerical value of power.
For the air-tightness for ensureing under high-pressure situations, the bolt seal circle 6 of 6 ~ 10 thickness 2mm is arranged in 5 bottom of hollow bolt, when
Hollow bolt 5 can ensure pressure-bearing soil sample case after fastening by way of 6 pinch sensors lead of bolt seal circle（1）It does not leak
Gas.
Test case
To ensure dehumidification and freezing two kinds of experiment process comparability, the pedotheque of selection the same category and quality, and
Sample preparation is carried out according to identical preparation method and instrument.
First with the present invention to grain sized≤ 2 mm, initial volume water content 30.2%, bottom surface radius 10cm, high 12cm
Cylindric silt has carried out dehumidification experiment in the state of 10 DEG C of constant temperature, passes through pressure gauge and weighing unit reading calculates and obtains soil sample
Stable volume water content when reaching equilibrium state under the conditions of each pressure value.Meanwhile passing through moisture, matric suction sensor
With the connection of data collecting instrument, electronic computer, the dynamic of volumetric(al) moisture content and matric suction during experiment has been monitored in real time
Change procedure.The characteristic curve of soil moisture that soil sample is obtained by both modes, to be compared.
Fig. 2 gives characteristic curve of soil moisture of the test soil sample in constant temperature drying.
Include that soil sample tests the numerical value of conversion and by sensing in each equilibrium state by pressure gauge and Weighing module in figure
The characteristic curve of soil moisture that device real-time testing obtains（Liquid water volume content and matric suction variation relation curve）, from figure
It can be seen that variation tendency reaches unanimity, the goodness of fit is fine.The pilot system can not only simply, accurately test soil sample de-
Pressure value and Liquid water content during wet under equilibrium state, moreover it is possible to test soil sample real-time dynamic liquid in drying
Water and matric suction variation, testing efficiency are high.Then freezing test has been carried out using soil sample identical with above-mentioned parameter, this time
Freezing test is chosen and is carried out under normal pressure state, is obtained in freezing process by temperature moisture transducer, matric suction sensor
The dynamic changing process of liquid water volume content and matric suction.
Fig. 3 gives characteristic curve of soil moisture of the test soil sample in normal pressure freezing process.
It can be found that the same soil body is freezing to have with the characteristic curve of soil moisture in drying compared with Fig. 2
The conclusion of very strong similitude, this and previous researcher is consistent.
By contrast test it is also found that under similarity condition the soil body freeze it is easier than drying very much because
The matric suction of freezing process is less than drying under the conditions of same volume Liquid water content.
Claims (3)
1. it is a kind of can dynamic testing soil dehumidification/frozen water content feature pilot system, including pressurization systems for moisture removal, temperature control
System and automated data acquisition system three parts, it is characterised in that：
The pressurization systems for moisture removal includes pressure-bearing soil sample case（1）, soil sample case head cover（2）, fastening bolt（3）, soil sample case sealing
Circle（4）, hollow bolt（5）, bolt seal circle（6）, interval pedestal（7）, permeable stone with water draining beak（8）, soil sample confinement ring
（9）, impermeable layer（10）, collection bottle（11）, Weighing module（12）, soil sample bottom seat（13）, temperature moisture transducer（14）, base
Matter suction sensor（15）, pressue device（16）, pressure gauge（17）；
The temperature control system includes constant temperature control box（18）, top cover of box（19）, head cover shaft（20）, refrigeration compressor
（21）, compressor cooling fin（22）, circulating fan（23）, electric heating wire（24）, temperature controller（25）, temperature control panel
（26）, temperature sensor（27）；
The automated data acquisition system includes sensor lead, data collecting instrument（28）, computer（29）；
Constant temperature control box（18）Pass through head cover shaft（20）With top cover of box（19）Connection；Constant temperature control box（18）It is interior to be equipped with pressure-bearing
Soil sample case（1）, interval pedestal（7）, Weighing module（12）, soil sample bottom seat（13）, refrigeration compressor（21）, convection fan
（23）, electric heater（24）, temperature controller（25）；Constant temperature control box（18）Side wall is equipped with compressor cooling fin（22）；Compression
Machine cooling fin（22）With refrigeration compressor（21）Connection；Constant temperature control box（18）It is externally provided with pressue device（16）, temperature control plane
Plate（26）, data collecting instrument（28）And computer（29）；Temperature control panel（26）Respectively with convection fan（23）, electric heating wire
（24）, temperature controller（25）Connection；
Pressure-bearing soil sample case（1）Pass through fastening bolt（3）With soil sample case head cover（2）Connection, inner cavity, which is one, can bear a level pressure
The enclosure space of power；Pressure-bearing soil sample case（1）It is interior to be equipped with interval pedestal（7）, permeable stone with water draining beak（8）, soil sample confinement ring
（9）, impermeable layer（10）；Pressure-bearing soil sample case（1）Place interval pedestal in bottom（7）；It is spaced pedestal（7）Upper placement impermeable layer
（10）；Impermeable layer（10）Upper placement soil sample confinement ring（9）；Soil sample confinement ring（9）Interior placement soil sample；
The soil sample case head cover（2）It is equipped with hollow bolt（5）；Hollow bolt（5）Bottom is equipped with bolt seal circle（6）；
The pressure gauge（17）Connect pressue device（16）；Pressue device（16）Pass through conduit and pressure-bearing soil sample case（1）Inner cavity
Connection；
Moisture transducer is arranged in soil sample（14）With matric suction sensor（15）；
Moisture transducer（14）, matric suction sensor（15）Pass through sensor lead and data collecting instrument（28）Connection, sensing
Device lead passes through soil sample case head cover（2）The hollow bolt of upper setting（5）Extraction can pressure-bearing soil sample case（1）；
The data collecting instrument（28）With computer（29）Connection；
The soil sample confinement ring（9）With impermeable layer（10）Between be equipped with the permeable stone with water draining beak（8）；
The permeable stone with water draining beak（8）Pass through conduit and collection bottle（11）Connection；Collection bottle（11）It is positioned over mould of weighing
Block（12）On.
2. it is according to claim 1 it is a kind of can dynamic testing soil dehumidification/frozen water content feature pilot system, feature
It is：The refrigeration compressor（21）, convection fan（23）, electric heater（24）, temperature controller（25）And temperature sensing
Device（27）Realize constant temperature control box（18）Interior temperature adjusts and keeps temperature incubation function.
3. it is according to claim 1 it is a kind of can dynamic testing soil dehumidification/frozen water content feature pilot system, feature
It is：The bolt seal circle（6）Quantity is 6 ~ 10, ensures pressure-bearing soil sample case（1）Air-tightness.
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