CN108287121A - Measure the device and method of the water characteristic curve of soil dehumidification and moisture absorption process - Google Patents
Measure the device and method of the water characteristic curve of soil dehumidification and moisture absorption process Download PDFInfo
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- CN108287121A CN108287121A CN201711322257.9A CN201711322257A CN108287121A CN 108287121 A CN108287121 A CN 108287121A CN 201711322257 A CN201711322257 A CN 201711322257A CN 108287121 A CN108287121 A CN 108287121A
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- soil
- vessel
- cutting ring
- water
- characteristic curve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
- G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
Abstract
The present invention provides a kind of measurement soil dehumidification and the device and methods of the water characteristic curve of moisture absorption process, the device includes cutting ring, two tensometers, analyzer, pottery clay plates and the first vessel, two trepannings being provided on cutting ring side wall at the different height of side wall, cutting ring are set in outside soil to be determined；Two tensometers are configured to be suitable for being inserted into soil by two trepannings and measuring the tension of soil；Pottery clay plates are placed in the first vessel, are used to support cutting ring；First vessel are configured as when measuring the water characteristic curve of soil hygroscopic process, and the water in the first vessel remains at sustained height with pottery clay plates upper surface；Analyzer is configured to measure and record the weight or cutting ring of the corresponding cutting ring of multiple predetermined times and soil, the weight of the first vessel, pottery clay plates and soil, and records the registration of corresponding two tensometers of predetermined time.The present invention can be used for measuring moisture absorption and the corresponding characteristic curve of soil moisture of two processes of dehumidification of soil.
Description
Technical field
The present invention relates to irrigation and water conservancy scientific research apparatus technical field, more particularly to a kind of measurement soil dehumidification and moisture absorption process
Water characteristic curve device and method.
Background technology
Soil water suction changes with soil moisture content, and relation curve is known as characteristic curve of soil moisture.Soil moisture
Indicatrix reflects the relationship between soil moisture potential and quantity, is that research Soil Moisture Dynamics property is essential heavy
Parameter is wanted, there is important directive significance in production practice.For same soil, even if under identical condition, by soil
Dehumidification (by wet exsiccation) process and soil hygroscopic (are got wet) water characteristic curve that process measures by dry and are also different, this existing
As being known as " hysteresis ".When studying the Infiltration Processes for Different Vegetation of alternation of wetting and drying, particularly with the soil that grittiness is larger, with soil
Earth dehumidification and the corresponding water characteristic curve of two processes of moisture absorption can just obtain preferably simulating effect.Therefore it needs to use instrument
Device soil dehumidification and the corresponding water characteristic curve of two processes of moisture absorption.
Generally use ku-pf unsaturated hydraulic conductivities measuring system measures the water characteristic curve of soil at present.Ku-pf is non-
Saturated hydraulic conductivity measuring system includes for placing the cutting ring of soil, attic base, two tensometers and being electrically connected with two tensometers
Analyzer, by two trepannings on the side wall of cutting ring, a trepanning is located above another trepanning.It, will be to be tested when measuring
Wet soil earth is placed in cutting ring, is then inserted into two tensometers in wet soil earth by an opening of cutting ring respectively, analyzer
The weight of the corresponding cutting ring of predetermined time and soil is measured and recorded, and records the registration of two tensometers.Wait for two tensometers
Registration when no longer changing, terminate to measure.The data recorded according to analyzer are handled, and the moisture of drying soil is obtained
Indicatrix.
In the implementation of the present invention, the inventors discovered that having at least the following problems in the prior art：
Existing ku-pf unsaturated hydraulic conductivities measuring system can only survey the water characteristic curve of drying soil, cannot
Measure the water characteristic curve of soil hygroscopic process.
Invention content
In view of this, the present invention provide it is a kind of measurement soil dehumidification and moisture absorption process water characteristic curve device and side
Method can measure soil dehumidification and the corresponding water characteristic curve of two processes of moisture absorption.
Specifically, including technical solution below：
In a first aspect, an embodiment of the present invention provides the water characteristic curves of a kind of measurement soil dehumidification and moisture absorption process
Device, including cutting ring, two tensometers, analyzer, pottery clay plates and the first vessel, wherein
There are two trepannings, described two trepannings to be located at the different height of the side wall for setting on the side wall of the cutting ring,
The cutting ring is configured as being set in outside soil to be determined；
Described two tensometers are configured to be suitable for being inserted into soil by described two trepannings and measuring soil
Tension
The pottery clay plates are placed in first vessel, are used to support the cutting ring；
First vessel are configured as when measuring the water characteristic curve of soil hygroscopic process, in first vessel
The upper surfaces of water and the pottery clay plates remain at sustained height；
The analyzer is configured to measure and record the soil in the corresponding cutting ring of multiple predetermined times and the cutting ring
The weight of the weight of earth or the cutting ring, first vessel, the pottery clay plates and the soil in the cutting ring, and record
The registration of corresponding two tensometers of the multiple predetermined time.
Selectively, described device further includes the second vessel of sealing, and first vessel are connected to second vessel,
Water in second vessel is suitable for being flowed into first vessel；
Conduit is provided in second vessel, the tube at one end extends to outside second vessel；
The first vessel upper end opening, the conduit constitute linker, the water in the conduit with first vessel
Remain at sustained height with the upper surface of the pottery clay plates, the water level line of second vessel to the bottom of the conduit it
Between water be used for supplying needed for soil hygroscopic in the cutting ring.
Selectively, liquid outlet is offered on the side wall of second vessel, is offered on the side wall of first vessel
Inlet, the liquid outlet are connected to the inlet by pipeline.
Selectively, it is provided with switch on the pipeline.
Selectively, the cutting ring is configured as when being placed on the pottery clay plates, and two trepannings are located at described the
Above one vessel.
Selectively, it is provided with attic base on the analyzer, for placing the cutting ring.
Selectively, described device further includes sieve chassis, for placing the cutting ring and the soil to be detected, and
It is placed in water, so that the soil water sorption to be detected.
Second aspect, the present invention also provides the sides of a kind of measurement soil dehumidification and the water characteristic curve of moisture absorption process
Method, described first aspect any one of them measure the device of the water characteristic curve of soil dehumidification and moisture absorption process to realize,
The method includes：
It is set in outside the water saturated soil of leaching and is placed on analyzer using cutting ring；
Two tensometers are inserted by corresponding trepanning in the soil in the cutting ring respectively；
Soil in the cutting ring corresponding with multiple predetermined times are recorded and the cutting ring is measured using the analyzer
Weight, and the registration of corresponding two tensometers of the multiple predetermined time is recorded, until two tensometers
Registration no longer changes, and obtains the soil of dehumidification；
The soil of the cutting ring and the dehumidification is placed on the pottery clay plates in the first vessel, the water in first vessel
Sustained height is remained at the upper surface of the pottery clay plates；
Soil in the cutting ring corresponding with multiple predetermined times are recorded and the cutting ring is measured using the analyzer
Weight, and the registration of corresponding two tensometers of the multiple predetermined time is recorded, until two tensometers
Registration no longer changes.
Selectively, two tensometers are inserted by corresponding trepanning in the soil in the cutting ring respectively described
Before, the method further includes：Two tensometers are calibrated.
Selectively, it is set in using cutting ring described with before being placed on the analyzer outside the good soil of bubble,
The method further includes：
The cutting ring is set in outside the soil to be detected and is placed on sieve chassis, later by the sieve bottom
Disk is put into water, keeps the height of water to be less than the trepanning of the lower section of the cutting ring, until the soil upper surface to be detected has
Water overflows.
The advantageous effect of technical solution provided in an embodiment of the present invention：
The device and method of the water characteristic curve provided in an embodiment of the present invention for measuring soil dehumidification and moisture absorption process, leads to
Two trepannings of setting on cutting ring are crossed, to which two tensometers can be inserted into soil to be detected by corresponding trepanning respectively
Measure the tension of soil；Cutting ring and the soil of water suction are placed on analyzer, to which analyzer measures and record soil dehydration
The weight of multiple predetermined time soil corresponding cutting ring and the soil in cutting ring in journey, and it is corresponding to record multiple predetermined times
The registration of two tensometers realizes the measurement to the characteristic curve of soil moisture of drying soil；By setting the first vessel
And the pottery clay plates for placing cutting ring are set in the first vessel, and the first vessel are configured as when measurement soil hygroscopic mistake
When the water characteristic curve of journey, the upper surface of water and pottery clay plates in the first vessel remains at sustained height, to cutting ring
After being placed on pottery clay plates, the sustainable water suction of soil in cutting ring, analyzer measure and record soil water sorption during it is multiple
The weight of the corresponding cutting ring of predetermined time soil, the first vessel, pottery clay plates and the soil in cutting ring, and record multiple predetermined times
The registration of corresponding two tensometers realizes the measurement to the characteristic curve of soil moisture of soil hygroscopic process.It is de- according to soil
The quantity of analyzer record, can be obtained the characteristic curve of soil moisture of drying soil during wet；According to soil hygroscopic mistake
The quantity that analyzer records in journey, can be obtained the characteristic curve of soil moisture of soil hygroscopic process.Therefore, the embodiment of the present invention carries
The device and method of the water characteristic curve for measuring soil dehumidification and moisture absorption process of confession, can be used for measuring soil hygroscopic process and
The characteristic curve of soil moisture of drying.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the structural schematic diagram of cutting ring provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the first vessel and the second vessel provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of analyzer provided in an embodiment of the present invention.
Reference numeral in figure is respectively：
1, cutting ring；
2, tensometer；
3, analyzer；
301, display screen；
302, button；
303, attic base；
4, pottery clay plates；
5, the first vessel；
501, holder；
6, the second vessel；
7, conduit；
8, pipeline；
9, it switchs.
Specific implementation mode
To keep technical scheme of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into
One step it is described in detail.
An embodiment of the present invention provides a kind of measurement soil dehumidification and the devices of the water characteristic curve of moisture absorption process, including
1, two tensometer 2 of cutting ring, analyzer 3, pottery clay plates 4 and the first vessel 5, wherein
Trepanning (unused reference numeral is shown in figure, is located at tensometer 2) there are two settings on the side wall of cutting ring 1, two
Trepanning is located at the different height of the side wall of cutting ring 1, and cutting ring 1 is configured as being set in outside soil to be determined；
Two tensometers 2 are configured to be suitable for being inserted into soil by two trepannings and measuring the tension of soil；
Pottery clay plates 4 are placed in the first vessel 5, are used to support cutting ring 1；
First vessel 5 are configured as when measuring the water characteristic curve of soil hygroscopic process, the water in the first vessel 5 with
The upper surface of pottery clay plates 4 remains at sustained height；
Analyzer 3 is configured to measure and record the weight of multiple predetermined times corresponding cutting ring 1 and the soil in cutting ring 1,
Or the weight of cutting ring 1, the first vessel 5, pottery clay plates 4 and the soil in cutting ring 1, and it is two corresponding to record multiple predetermined times
The registration of tensometer 2.
Wherein, the time interval between two adjacent predetermined times can be equal.The time interval can be set by operating personnel
It is fixed, for example may be configured as 10 minutes or 5 minutes.
Below with regard to the device of measurement soil dehumidification provided in an embodiment of the present invention and the water characteristic curve of moisture absorption process
Operation principle is described：
When measuring the characteristic curve of soil moisture of drying soil using device provided in an embodiment of the present invention, first
Cutting ring 1 is sleeved on outside the good soil to be detected of bubble, is placed on analyzer 3, later passes through two tensometers 2 respectively
Corresponding trepanning on cutting ring 1 is inserted into the soil in cutting ring 1.Soil continues dehydration, and analyzer 3 is measured and recorded multiple pre-
If the weight of moment corresponding cutting ring 1 and soil, and record the registration of corresponding two tensometers 2 of multiple predetermined times.When two
When the registration of a tensometer 2 no longer changes, the drying of soil terminates, and obtains the soil of dehumidification.
When measuring the characteristic curve of soil moisture of soil hygroscopic process using device provided in an embodiment of the present invention, by ring
The soil of knife 1 and dehumidification is placed on the pottery clay plates 4 in the first vessel 5, and the first vessel 5 is placed on analyzer 3, analyzer 3
The weight of the corresponding cutting ring 1 of multiple predetermined times, the first vessel 5, pottery clay plates 4 and soil is measured and recorded, and is recorded multiple pre-
If the registration of moment corresponding two tensometers 2.Keep the top of the water and pottery clay plates 4 in the first vessel 5 always in same height
Degree, then soil can absorb water always.When the registration of two tensometers 2 no longer changes, the moisture absorption process of soil terminates.
According to the quantity that analyzer in drying soil 3 records, the Soil moisture characteristics of drying soil can be obtained
Curve；According to the quantity that analyzer during soil hygroscopic 3 records, the Soil moisture characteristics that soil hygroscopic process can be obtained are bent
Line.
The device of the water characteristic curve provided in an embodiment of the present invention for measuring soil dehumidification and moisture absorption process, by ring
Two trepannings are set on knife 1, are measured to which two tensometers 2 can be inserted into soil to be detected by corresponding trepanning respectively
The tension of soil；The soil of cutting ring 1 and water suction is placed on analyzer 3, to which analyzer 3 measures and record soil dehydration process
In multiple predetermined time soil corresponding cutting ring 1 and the soil in cutting ring 1 weight, and it is corresponding to record multiple predetermined times
The registration of two tensometers 2 realizes the measurement to the characteristic curve of soil moisture of drying soil；By setting the first vessel
5 and pottery clay plates 4 for placing cutting ring 1 are set in the first vessel 5, and the first vessel 5 are configured as when measuring soil
When the water characteristic curve of moisture absorption process, the upper surface of water and pottery clay plates 4 in the first vessel 5 remains at sustained height,
After being placed on pottery clay plates 4 to cutting ring 1, the sustainable water suction of soil in cutting ring 1, analyzer 3 measures and record soil water sorption
The weight of the corresponding cutting ring 1 of multiple predetermined time soil, the first vessel 5, pottery clay plates 4 and the soil in cutting ring 1 in the process, and
The registration of corresponding two tensometers 2 of multiple predetermined times is recorded, realizes the characteristic curve of soil moisture to soil hygroscopic process
Measurement.According to the quantity that analyzer in drying soil 3 records, the Soil moisture characteristics that drying soil can be obtained are bent
Line；According to the quantity that analyzer during soil hygroscopic 3 records, the characteristic curve of soil moisture of soil hygroscopic process can be obtained.
Therefore, the device of the water characteristic curve provided in an embodiment of the present invention for measuring soil dehumidification and moisture absorption process, can be used for measuring
The characteristic curve of soil moisture of soil hygroscopic process and drying.
In the present embodiment, as shown in figure 3, being provided with panel on analyzer 3, it is provided with display screen 301 on panel, shows
Screen 301 is for showing the data that analyzer 3 measures；It is also provided with multiple buttons 302 on panel, is respectively used to control analyzer
3 switch and for setting predetermined time.
Wherein, as shown in Fig. 2, being provided with holder 501 on the bottom surface of the first vessel 5, pottery clay plates 4 are placed on holder 501,
Holder 501 is the annular slab being arranged on the inner wall of the first vessel 5.
First vessel 5 are configured as when measuring the water characteristic curve of soil hygroscopic process, the water in the first vessel 5 with
The upper surface of pottery clay plates 4 remains at sustained height, can be accomplished in several ways, and now provides a kind of following embodiment：
As shown in Fig. 2, the device further includes the second vessel 6 of sealing, the first vessel 5 are connected to the second vessel 6, the second device
Water in ware 6 is suitable for being flowed into the first vessel 5；Conduit 7 is provided in second vessel 6, one end of conduit 7 extends to the second device
Outside ware 6；First vessel, 5 upper end opening, conduit 7 and the first vessel 5 constitute linker, and the water in conduit 7 is upper with pottery clay plates 4
End face remains at sustained height, and the water level line of the second vessel 6 is used for supplying in cutting ring 1 to the water between the bottom of conduit 7
Needed for soil hygroscopic.
So set, the upper end of the first vessel 5 and conduit 7 is in communication with the outside, lower end is connected to by the second vessel 6, two
Person constitutes linker.Make the upper surface of the water and pottery clay plates 4 in conduit 7 in sustained height, when soil is drawn in the first vessel 5
When water, the water in the second vessel 6 enters in the first vessel 5, makes water in the first vessel 5 upper surface with pottery clay plates 4 always
It is maintained at sustained height, to which soil can absorb water always.
In order to make the water in the second vessel 6 flow in the first vessel 5, as shown in Fig. 2, being opened up on the side wall of the second vessel 6
There is liquid outlet, inlet is offered on the side wall of the first vessel 5, liquid outlet is connected to inlet by pipeline 8.
Specifically, the position of inlet is arranged below the upper surface of pottery clay plates 4, to which liquid enters the first vessel 5
When interior, the water absorption course of soil is not influenced.In order to keep the water in conduit 7 to be located at same height with the upper surface of pottery clay plates 4 always
Degree, the height that water in the second vessel 6 is arranged are more than the height of pottery clay plates 4.
Wherein, the first vessel 5 can be surface plate, and the second vessel 6 can be Markov bottle, and the opening above Markov bottle uses rubber
Plug sealing, offer on rubber stopper suitable for conduit 7 by trepanning.The sealing of second vessel 6 is referred in addition to liquid outlet and rubber
Beyond the Great Wall conduit 7 by trepanning, seal elsewhere.
In order to facilitate the flowing of liquid between the second vessel 6 of control and the first vessel 5, as shown in Fig. 2, being arranged on pipeline 8
There is switch 9.
So set, before the water characteristic curve for starting to measure soil hygroscopic process, switch 9 is closed, and prevents the second device
Water in ware 6 is flowed into the first vessel 5.When starting to measure, 9 are turned on the switch, the second vessel 6 are connected to the first vessel 5, the
Water in two vessel 6 can be flowed into the first vessel 5.
In order to when cutting ring 1 is placed on the pottery clay plates 4 in the first vessel 5, convenient for two tensometers 2 are inserted into cutting ring 1
In, cutting ring 1 is configured as when being placed on pottery clay plates 4, and two trepannings are located at 5 top of the first vessel.
So set, when cutting ring 1 is placed on pottery clay plates 4, since two trepannings are located at 5 top of the first vessel, when two
When tensometer 2 is inserted by corresponding trepanning in soil respectively, two tensometers 2 are located at 5 top of the first vessel, to
First vessel 5 do not influence the insertion of tensometer 2.
For the ease of placing cutting ring 1, as shown in figure 3, attic base 303 is provided on analyzer 3, for placing cutting ring 1.
Before the drying for carrying out soil, needing that first soil to be detected soaks is saturated.For the ease of to be detected
Soil immersion saturation, which may also include sieve chassis, for placing cutting ring 1 and soil to be detected, be placed in water,
So that soil water sorption to be detected.
Specifically, when soil soaks and is saturated, soil to be detected is first taken using cutting ring 1, cutting ring 1 is then placed on sieve
On net bottom disk, sieve chassis is placed in water later, the height of water is made to be less than the trepanning of the lower section of cutting ring 1.
The embodiment of the present invention additionally provides a kind of method for the water characteristic curve measuring soil dehumidification and moisture absorption process, should
Method realizes that the method comprising the steps of using the device of the water characteristic curve of above-mentioned measurement soil dehumidification and moisture absorption process
201,202,203,204 and 205.Each step is specifically described below.
Step 201 is set in outside the water saturated soil of leaching using cutting ring 1 and is placed on analyzer 3.
In this step, the immersion saturation that sieve chassis carries out soil can be used.Specifically, when soil soaks and is saturated,
Soil to be detected is first taken using cutting ring 1, then cutting ring 1 is placed on sieve chassis, is later placed in water sieve chassis,
So that the height of water is less than the trepanning of the lower section of cutting ring 1, the height of water is kept to be less than the trepanning of the lower section of cutting ring 1.Until to be detected
Soil upper surface have water spilling, illustrate that the water in soil reaches saturation.
Two tensometers 2 are inserted by corresponding trepanning in soil by step 202 respectively.
Before this step, two tensometers 2 can be calibrated.Detailed process is as follows：
After being cleaned up tensometer 2 using no steam distillation water, the test side of tensometer 2 is immersed in and fills no steam distillation
In the small beaker of water, the screw of the other end of tensometer 2 is removed later, is connect with a conduit of surge flask, surge flask
Another conduit is connect with pressure gauge.It gives tensometer 2 to pressurize repeatedly with pressure gauge, keeps the bubble in 2 upper water of tensometer complete
Discharge.
The conduit of surge flask is extracted from the screw hole on 2 top of tensometer, by the screw hole of tensometer 2 to tensometer
Screw, is screwed into screw hole by topping-up in 2 later.
Tensometer 2 is stood to one day or so time.If having bubble in 2 upper water of tensometer, repeat the above steps, if
Bubble-free can then carry out following operate.
Analyzer 3 is connected with tensometer 2 with conducting wire, and two tensometers 2 are put into prover device, prover one
End is connected with pressure gauge, and analyzer 3 is connect with computer.The ku-pf softwares in computer desktop are opened, the school in work is selected
Zero buttons are clicked in positive option, input -50, are read the registration of two tensometers 2, are pressurizeed using pressure gauge, until calibration
Instrument scale value is -0.5, and the registration of two tensometers 2 is -50 or so.Refrence buttons are clicked, the pressure of pressure gauge is subtracted
To zero, tensometer 2 is removed.
Two tensometers 2 are inserted by the trepanning on cutting ring 1 in the soil in cutting ring 1 respectively later.
Step 203, the weight that corresponding with multiple predetermined times are recorded cutting ring 1 and soil are measured using analyzer 3, and remember
The registration for recording corresponding two tensometers 2 of multiple predetermined times obtains dehumidification until the registration of two tensometers 2 no longer changes
Soil.
When the registration of two tensometers 2 no longer changes, illustrate that the drying of soil is completed.
The data recorded later according to analyzer 3, obtain the characteristic curve of soil moisture of the drying of soil.
Relation curve of the characteristic curve of soil moisture between soil water suction and soil moisture content.
Wherein, the calculation formula of a certain moment soil moisture content is：
Wi=W1-W0-W
In formula,
θ --- soil moisture content；
Wi--- the weight of the water in soil；
The volume of V --- soil；
W1--- the total weight of cutting ring and soil
W0--- the weight of cutting ring；
W --- the weight of dry ground earth.
Wherein, the weight of the total weight and dry ground earth of cutting ring 1 and dry ground earth needs to be measured before testing.
The calculation formula of soil water suction is as follows：
In formula,
S --- soil water suction；
Htop--- the registration for the tensometer being located above；
Hbottom--- the registration of underlying tensometer.
Corresponding soil moisture content of multiple moment and soil water suction in drying soil is calculated, can be used two
Multiplication is fitted to obtain the relation curve between soil water suction and soil moisture content, the as soil water dtex of drying soil
Levy curve.
The characteristic curve of soil moisture for measuring soil hygroscopic process later, using step 204-205.
The soil of cutting ring 1 and dehumidification is placed on the pottery clay plates 4 in the first vessel 5 by step 204, is kept in the first vessel 5
Water and pottery clay plates 4 upper surface always in sustained height.
Step 205, the weight that corresponding with multiple predetermined times are recorded cutting ring and soil are measured using analyzer, and record
The registration of corresponding two tensometers of multiple predetermined times, until the registration of two tensometers no longer changes.
When the registration of two tensometers 2 no longer changes, illustrate that the moisture absorption process of soil is completed.
The data recorded later according to analyzer 3, obtain the characteristic curve of soil moisture of the moisture absorption process of soil.
Wherein, when measuring the data of moisture absorption process of soil, when not starting to measure, the water in the first vessel 5 is made to protect
It holds and is located at sustained height with the upper surface of pottery clay plates 4.
Wherein, the calculation formula of a certain moment soil moisture content is：
Wi=W2-W0-W
In formula,
θ --- soil moisture content；
Wi--- the weight of the water in soil；
The volume of V --- soil；
W2--- the total weight of cutting ring, pottery clay plates, the first vessel and soil that analyzer measures
W0--- the total weight of cutting ring, pottery clay plates, the first vessel and the water in the first vessel before measuring；
W --- the weight of dry ground earth.
Wherein, the weight needs of cutting ring 1, the total weight of pottery clay plates 4 and the first vessel 5 and dry ground earth are first surveyed before testing
It is fixed.
The calculation formula of soil water suction is as follows：
In formula,
S --- soil water suction；
Htop--- the registration for the tensometer being located above；
Hbottom--- the registration of underlying tensometer.
Corresponding soil moisture content of multiple moment and soil water suction during soil hygroscopic is calculated, can be used two
Multiplication is fitted to obtain the relation curve between soil water suction and soil moisture content, the as soil water dtex of soil hygroscopic process
Levy curve.
The reality of the method that above-described embodiment provides and the device for the water characteristic curve for measuring soil dehumidification and moisture absorption process
It applies example and belongs to same design, detail and advantageous effect refer to device embodiment, and which is not described herein again.
The above is merely for convenience of it will be understood by those skilled in the art that technical scheme of the present invention, not limiting
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection domain of invention.
Claims (10)
1. a kind of device for the water characteristic curve measuring soil dehumidification and moisture absorption process, which is characterized in that including cutting ring, two
Tensometer, analyzer, pottery clay plates and the first vessel, wherein
There are two trepannings for setting on the side wall of the cutting ring, and described two trepannings are located at the different height of the side wall, described
Cutting ring is configured as being set in outside soil to be determined；
Described two tensometers are configured to be suitable for being inserted into soil and measuring by described two trepannings of soil
Power；
The pottery clay plates are placed in first vessel, are used to support the cutting ring；
First vessel are configured as when measuring the water characteristic curve of soil hygroscopic process, the water in first vessel
Sustained height is remained at the upper surface of the pottery clay plates；
The analyzer is configured to measure and record the corresponding cutting ring of multiple predetermined times and the soil in the cutting ring
The weight of weight or the cutting ring, first vessel, the pottery clay plates and the soil in the cutting ring, and described in record
The registration of corresponding two tensometers of multiple predetermined times.
2. the device of the water characteristic curve according to claim 1 for measuring soil dehumidification and moisture absorption process, feature exist
In described device further includes the second vessel of sealing, and first vessel are connected to second vessel, in second vessel
Water be suitable for be flowed into first vessel；
Conduit is provided in second vessel, the tube at one end extends to outside second vessel；
The first vessel upper end opening, the conduit constitute linker, the water in the conduit and institute with first vessel
The upper surface for stating pottery clay plates remains at sustained height, and the water level line of second vessel is between the bottom of the conduit
Water is used for supplying needed for the soil hygroscopic in the cutting ring.
3. the device of the water characteristic curve according to claim 2 for measuring soil dehumidification and moisture absorption process, feature exist
In, liquid outlet is offered on the side wall of second vessel, offers inlet on the side wall of first vessel, it is described go out liquid
Mouth is connected to the inlet by pipeline.
4. the device of the water characteristic curve according to claim 3 for measuring soil dehumidification and moisture absorption process, feature exist
In being provided with switch on the pipeline.
5. the device of the water characteristic curve according to claim 1 for measuring soil dehumidification and moisture absorption process, feature exist
In the cutting ring is configured as when being placed on the pottery clay plates, and two trepannings are located above first vessel.
6. the device of the water characteristic curve according to claim 1 for measuring soil dehumidification and moisture absorption process, feature exist
In attic base being provided on the analyzer, for placing the cutting ring.
7. the device of the water characteristic curve of soil dehumidification and moisture absorption process is measured according to claim 1-6 any one of them,
It is characterized in that, described device further includes sieve chassis, for placing the cutting ring and the soil to be detected, it is placed in water
In, so that the soil water sorption to be detected.
8. a kind of method for the water characteristic curve measuring soil dehumidification and moisture absorption process, which is characterized in that the method uses
Claim 1-7 any one of them measures the device of the water characteristic curve of soil dehumidification and moisture absorption process to realize, described
Method includes：
It is set in outside the water saturated soil of leaching and is placed on analyzer using cutting ring；
Two tensometers are inserted by corresponding trepanning in the soil in the cutting ring respectively；
The weight of the soil in the cutting ring corresponding with multiple predetermined times are recorded and the cutting ring is measured using the analyzer
Amount, and the registration of corresponding two tensometers of the multiple predetermined time is recorded, until the registration of two tensometers
No longer change, obtains the soil of dehumidification；
The soil of the cutting ring and the dehumidification is placed on the pottery clay plates in the first vessel, the water in first vessel and institute
The upper surface for stating pottery clay plates remains at sustained height；
The weight of the soil in the cutting ring corresponding with multiple predetermined times are recorded and the cutting ring is measured using the analyzer
Amount, and the registration of corresponding two tensometers of the multiple predetermined time is recorded, until the registration of two tensometers
No longer change.
9. according to the method described in claim 8, it is characterized in that, two tensometers are passed through corresponding trepanning respectively described
Before being inserted into the soil in the cutting ring Nei, the method further includes：Two tensometers are calibrated.
10. according to the method described in claim 8, it is characterized in that, being set in the good soil of bubble using cutting ring described
Before being placed in outside on the analyzer, the method further includes：
The cutting ring is set in outside the soil to be detected and is placed on sieve chassis, later puts the sieve chassis
Into water, the height of water is kept to be less than the trepanning of the lower section of the cutting ring, until the soil upper surface to be detected has water to overflow
Go out.
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